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Unity Biotechnology, Inc.

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FY2020 Annual Report · Unity Biotechnology, Inc.
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UNITED STATES
SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

FORM 10-K

(Mark One)
☒

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2020
OR

☐

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 FOR THE TRANSITION PERIOD
FROM                      TO                     

Commission File Number 001-38470

Unity Biotechnology, Inc.

(Exact name of Registrant as specified in its Charter)

Delaware
( State or other jurisdiction of
incorporation or organization)
285 East Grand Ave.
South San Francisco, CA
(Address of principal executive offices)

26-4726035
(I.R.S. Employer
Identification No.)

94080
(Zip Code)

Registrant’s telephone number, including area code: (650) 416-1192

Securities registered pursuant to Section 12(b) of the Act:

Title of each class
Common Stock, par value $0.0001

Trading Symbol(s)
UBX

Name of each exchange on which registered
The Nasdaq Global Select Market

Indicate by check mark if the Registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. YES ☐ NO ☒

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the Registrant is not required to file reports pursuant to Section 13 or 15(d) of the Act. YES ☐ NO ☒
Indicate by check mark whether the Registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such
shorter period that the Registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. YES ☒ NO ☐
Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter)
during the preceding 12 months (or for such shorter period that the Registrant was required to submit such files). YES ☒ NO ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions
of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.
Large accelerated filer
Non-accelerated filer
Emerging growth company

Accelerated filer
Smaller reporting company

  ☐
  ☒

  ☐  
  ☒  
  ☒  

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards
provided pursuant to Section 13(a) of the Exchange Act.  ☐

Indicate by check mark whether the Registrant has filed a report on and attestation to its management assessment of the effectiveness of its internal control over financial reporting under Section
404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☐

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). YES ☐ NO ☒
The aggregate market value of the voting and non-voting common equity held by non-affiliates of the Registrant, based on the closing price of the shares of common stock on The Nasdaq Global
Select Market on June 30, 2020, was $326,317,326.

The number of shares of Registrant’s Common Stock outstanding as of March 19, 2021 was 54,699,491.

DOCUMENTS INCORPORATED BY REFERENCE
Portions of the Registrant’s Definitive Proxy Statement relating to the 2021 Annual Meeting of Shareholders, scheduled to be held on June 24, 2021, are incorporated by reference into Part III of this
Report. Such proxy statement will be filed with the Securities and Exchange Commission within 120 days of the end of the fiscal year covered by this Annual Report on Form 10-K.

 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
PART I
Item 1.
Item 1A.
Item 1B.
Item 2.
Item 3.
Item 4.

PART II
Item 5.
Item 6.
Item 7.
Item 7A.
Item 8.
Item 9.
Item 9A.
Item 9B.

PART III
Item 10.
Item 11.
Item 12.
Item 13.
Item 14.

PART IV
Item 15.
Item 16.

Table of Contents

Business
Risk Factors
Unresolved Staff Comments
Properties
Legal Proceedings
Mine Safety Disclosures

Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities
Selected Financial Data
Management’s Discussion and Analysis of Financial Condition and Results of Operations
Quantitative and Qualitative Disclosures About Market Risk
Financial Statements and Supplementary Data
Changes in and Disagreements With Accountants on Accounting and Financial Disclosure
Controls and Procedures
Other Information

Directors, Executive Officers and Corporate Governance
Executive Compensation
Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters
Certain Relationships and Related Transactions, and Director Independence
Principal Accounting Fees and Services

Exhibits, Financial Statement Schedules
Form 10-K Summary
Signatures

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Forward-Looking Statements

This  Annual  Report  on  Form  10-K  contains  “forward-looking  statements”  within  the  meaning  of  Section  21E  of  the  Securities  Exchange  Act  of  1934,  as
amended,  or  the  Exchange  Act.  All  statements  other  than  statements  of  historical  facts  contained  in  this  Annual  Report  on  Form  10-K  are  statements  that  could  be
deemed forward-looking statements reflecting the current beliefs and expectations of management with respect to future events or to our future financial performance and
involve known and unknown risks, uncertainties, and other factors that may cause our actual results, performance or achievements to be materially different from any
future results, performance or achievements expressed or implied by these forward-looking statements. These statements are often identified by the use of words such as
“aim,” “anticipate,” “assume,” “believe,” “contemplate,” “continue,” “could,” “due,” “estimate,” “expect,” “goal,” “if,” “intend,” “may,” “objective,” “plan,” “predict,”
“potential,” “positioned,” “seek,” “should,” “target,” “will,” “would,” “until,” and similar expressions or variations. Forward-looking statements contained in this Annual
Report on Form 10-K include, but are not limited to, statements about:

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our expectations regarding the potential benefits, activity, effectiveness, and safety of our drug candidates;

our  expectations  with  regard  to  the  results  of  our  clinical  studies,  preclinical  studies,  and  research  and  development  programs,  including  the  timing  and
availability of data from such studies;

our preclinical, clinical, and regulatory development plans for our drug candidates, including the timing or likelihood of regulatory filings and approvals for
our drug candidates;

our  expectations  with  regard  to  our  ability  to  acquire,  discover,  and  develop  additional  drug  candidates  and  advance  such  drug  candidates  into,  and
successfully complete, clinical studies;

our expectations regarding the potential market size and size of the potential patient populations for our drug candidates, if approved for commercial use;

our intentions and our ability to establish collaborations and/or partnerships;

the  timing  and  amount  of  any  milestone  payments  we  are  obligated  to  make  pursuant  to  our  existing  license  agreements  and  any  future  license  or
collaboration agreements that we may enter into;

our commercialization, marketing, and manufacturing capabilities and expectations;

our intentions with respect to the commercialization of our drug candidates;

the pricing and reimbursement of our drug candidates, if approved;

the implementation of our business model and strategic plans for our business and drug candidates, including additional indications which we may pursue;

the scope of protection we are able to establish and maintain for intellectual property rights covering our drug candidates, including the projected terms of
patent protection;

estimates of our expenses, future revenue, capital requirements, our needs for additional financing, and our ability to obtain additional capital;

our anticipated use of proceeds from our initial public offering;

our future financial performance;

developments and projections relating to our competitors and our industry, including competing therapies; and

other risks and uncertainties, including those listed under the caption “Risk Factors.”

We caution you that the foregoing list may not contain all of the forward-looking statements made in this Annual Report on Form 10-K.

Forward-looking statements involve known and unknown risks, uncertainties and other factors that may cause our actual results, performance or achievements to
be materially different from any future results, performance, or achievements expressed or implied by the forward-looking statements. We discuss these risks in greater detail
in “Risk Factors” and elsewhere in this Annual Report on Form 10-K. Given these uncertainties, you should not place undue

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reliance  on  these  forward-looking  statements.  Also,  forward-looking  statements  represent  our  management’s  beliefs  and  assumptions  only  as  of  the  date  of  this  Annual
Report on Form 10-K. Except as required by law, we assume no obligation to update these forward-looking statements publicly, or to update the reasons actual results could
differ materially from those anticipated in these forward-looking statements, even if new information becomes available in the future.

This  Annual  Report  on  Form  10-K  also  contains  estimates,  projections,  and  other  information  concerning  our  industry,  our  business  and  the  markets  for
certain drugs, including data regarding the estimated size of those markets, their projected growth rates, and the incidence of certain medical conditions. Information that
is based on estimates, forecasts, projections or similar methodologies is inherently subject to uncertainties, and actual events or circumstances may differ materially from
events  and  circumstances  reflected  in  this  information.  Unless  otherwise  expressly  stated,  we  obtained  this  industry,  business,  market,  and  other  data  from  reports,
research surveys, studies, and similar data prepared by third parties, industry, medical and general publications, government data, and similar sources. In some cases, we
do not expressly refer to the sources from which this data is derived. In that regard, when we refer to one or more sources of this type of data in any paragraph, you
should assume that other data of this type appearing in the same paragraph is derived from the same sources, unless otherwise expressly stated or the context otherwise
requires.

Trademarks

This Annual Report on Form 10-K includes trademarks, service marks, and trade names owned by us or other companies. All trademarks, service marks and

trade names included in this Annual Report on Form 10-K are the property of their respective owners.

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PART I

Item 1. Business.

Overview

Our  mission  is  to  slow,  halt,  or  reverse  diseases  of  aging.  Our  initial  focus  is  on  creating  senolytic  medicines  to  selectively  eliminate  senescent  cells  and

thereby treat diseases of aging, such as ophthalmologic and neurologic diseases.

Diseases of aging cause considerable economic, personal, and societal burden. As individuals age, the prevalence of chronic disease increases, with 80% of
older Americans having at least one chronic disease and 50% having two or more. Diseases of aging negatively impact quality of life, are typically chronic, and progress
from the time of onset until death. It is estimated that providing healthcare for people over the age of 65 costs four to five times more than for younger individuals.
According to the United States Census Bureau, this elderly population of Americans is expected to increase nearly 50% by 2050, increasing the economic burden of
aging dramatically. Any success increasing longevity without treating underlying diseases of aging would only serve to increase this burden.

We believe that by creating medicines that target fundamental aging mechanisms, we can reduce the economic, personal, and societal burden of aging and

enhance quality of life.

Targeting Cellular Senescence and Other Biologies of Aging

We  believe  that  the  accumulation  of  senescent  cells  is  a  fundamental  mechanism  of  aging  and  a  driver  of  many  common  diseases  of  aging.  Cellular
senescence is a natural biological state in which a cell permanently halts division. These cells are referred to as senescent. Senescent cells accumulate with age, secreting
large quantities of more than 100 proteins, including inflammatory factors, proteases, fibrotic factors, and growth factors, that disturb the tissue micro-environment. This
collection of secreted proteins is referred to as the Senescence Associated Secretory Phenotype, or SASP. In addition to its effects on tissue function, the SASP contains
factors that induce senescence in neighboring cells, setting off a cascade of events that culminates in the formation of the functionally aged and/or diseased tissue that
underlies a variety of age-related diseases.

We are developing senolytic medicines to eliminate senescent cells and thereby lower the production of the SASP, which we believe addresses a root cause of
age-related diseases. Many existing therapeutics, such as antibodies, target single SASP factors, but fail to remove the cells that continually produce these factors. By
stopping the production of the SASP at it source, we believe senolytic medicines could have a more durable impact by slowing, halting, or reversing particular diseases
of aging, and shift the treatment paradigm from chronic to intermittent dosing. Less frequent dosing may also improve drug tolerability and patient adherence.

While our primary focus is on programs targeting cellular senescence, we are exploring other biologies of aging that may have a major impact on diseases of
aging. For instance, we have a preclinical program targeting Tie2 signaling in the eye. Tie2 is a receptor tyrosine kinase that is implicated in regulating barrier function in
blood vessels of the eye, which are affected in several prevalent eye diseases. We also have a preclinical program based on α-Klotho, a protein that has been implicated in
human cognition and may provide benefits in age-related cognitive dysfunctions.

Our Pipeline

We are developing a portfolio of programs targeting specific biological mechanisms implicated in diseases of aging. Our core therapeutic approach targets
cellular  senescence,  and  we  are  currently  advancing  senolytic  programs  in  ophthalmologic  and  neurologic  disorders.  Our  clinical  development  strategy  is  to  focus
initially  on  the  development  of  senolytic  medicines  designed  to  be  administered  locally  into  diseased  tissue.  After  demonstrating  efficacy  in  indications  amenable  to
localized therapy, we plan to pursue the development of senolytic medicines that could be administered systemically to treat additional diseases of aging. In addition to
our efforts to eliminate senescent cells, we are also advancing other programs based on other biologies of aging including an agonistic antibody to the Tie2 receptor to
treat vascular eye disease and α-Klotho hormone to treat cognitive disorders.  

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Our current pipeline of programs is illustrated below:

Figure 1: UNITY pipeline as of January 2021

Ophthalmology Program

UBX1325  is  our  most  advanced  lead  drug  candidate  for  age-related  diseases  of  the  eye,  including  age-related  macular  degeneration,  or  AMD,  diabetic
macular edema, or DME, and diabetic retinopathy. UBX1967 is our back-up compound to UBX1325. Both of these drug candidates are potent small molecule inhibitors
of  Bcl-xL,  a  member  of  the  Bcl-2  family  of  apoptosis  regulating  proteins,  each  of  which  have  shown  distinct  tissue  residence  time  profiles  in  preclinical  studies.
UBX1325 and UBX1967 are designed to inhibit the function of proteins that senescent cells rely on for survival. In our preclinical studies, we have demonstrated that
targeting Bcl-xL with UBX1325 and UBX1967 preferentially eliminated senescent cells from diseased tissue while sparing cells in healthy tissue. In July 2020, we filed
an Investigational New Drug application, or IND, to commence a Phase 1 study of UBX1325. We initiated a Phase 1 clinical study of UBX1325 in patients with DME
and AMD. The first patient was dosed in October 2020 and we expect to obtain initial results from this study in the first half of 2021.

Under our current amended license agreement with Ascentage Pharma Group Corp. Limited, or Ascentage, we have, among other things, exclusive worldwide
development and commercialization rights and non-exclusive manufacturing rights to UBX1325 outside of Greater China (China, Hong Kong, Macau and Taiwan) in all
non-oncology indications.  Inside Greater China, we will be obligated to develop, manufacture and commercialize UBX1325 through a joint venture with Ascentage. See
“—Licenses and Collaborations.”

UBX2050  is  our  investigational,  fully  human  anti-Tie2  agonist  monoclonal  antibody,  which  we  are  developing  for  the  treatment  of  age-related  eye
diseases.  UBX2050 is derived from an asset that was acquired from Achaogen, Inc. in June 2020 through an Asset Purchase Agreement. UBX2050 was selected based
on its potential to activate the Tie2 receptor in vitro and has demonstrated encouraging activity in preclinical models of ocular disease. We anticipate that IND-enabling
activities will commence in the second half of 2021.    

Neurology Program

UBX2089,  or  α-Klotho  hormone  drug  candidate,  is  a  circulating  hormone  primarily  produced  in  the  kidneys  and  choroid  plexus  of  the  brain,  which  we  are
researching  for  multiple  neurology  indications.  Human  genetic  evidence  links  α-Klotho  to  cognitive  function,  and  we  have  observed  pro-cognitive  activity  of
recombinant α-Klotho in multiple preclinical rodent and non-human primate models. We are investigating the effect of UBX2089 on engaging CNS circuits in preclinical
animal models with the intent of advancement to clinical studies.

We believe cellular senescence may play a fundamental role in neurodegeneration. Multiple lines of evidence suggest that senescent cells accumulate in the
nervous system during normal aging and neurodegenerative diseases such as Alzheimer’s, Parkinson’s and Amyotrophic Lateral Sclerosis. Several third-party preclinical
proof of

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concept studies in mouse models of aging and neurodegeneration have provided preliminary evidence that the removal of senescent cells via senolytic drugs or genetic
methods have the potential to improve brain function. We are currently pursuing our lead senolytic targets in multiple neurology indications.

Our Strategy

Our goal is to develop transformative therapies for diseases of aging. We plan to achieve this goal by targeting the fundamental biology of aging to slow, halt,
or reverse specific diseases of aging. Our primary approach is to target cellular senescence by developing senolytic medicines. In addition, we dedicate resources and
effort to better understanding fundamental aging mechanisms and translating these insights into human medicines. This pioneering work has been supported by valuable
collaborations with leading academics. By investing early in the science of aging, we believe we are positioned to translate the field of aging biology from fundamental
scientific insights to the development and commercialization of medicines. Our core strategies to achieve this objective include:

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Demonstrating in our clinical studies that local treatment with senolytic medicines can alter the course of age-related diseases.    We believe that local
treatment with senolytic medicines has the potential to slow, halt, or reverse aspects of aging. If we prove this concept in a localized setting, we will be well-
positioned to expand upon that success with additional applications.

Continuing  research  into  the  development  of  systemic  senolytic  medicines.        We  believe  that  harnessing  the  full  potential  of  senolysis,  or  the  selective
elimination  of  senescent  cells,  to  alter  many  diseases  of  aging  will  require  systemic  senolytic  medicines.  We  are  exploring  the  development  of  systemic
senolytic medicines using multiple modalities, including small molecules, antisense oligonucleotides, and biologics.

Targeting aging mechanisms beyond cellular senescence.    While senolysis has been shown to affect the course of multiple diseases of aging, we believe
achieving  our  broader  goal  of  slowing,  halting,  or  reversing  specific  diseases  of  aging  will  require  intervention  in  additional  aging  mechanisms  beyond
cellular senescence. We will continue to conduct fundamental research into these other aging mechanisms, including the use of a Tie2 receptor agonist in eye
diseases  and  α-Klotho  hormone  in  cognitive  disorders.  We  will  also  continue  to  partner  with  the  most  forward-thinking  aging  researchers  in  the  world  to
foster a collaborative environment to bring their insights, innovation, and technologies into our powerful research and drug development infrastructure.

Leveraging  our  core  science  and  biotechnology  experience.        We  strive  to  attract,  retain,  and  incentivize  a  unique  team  with  significant  strengths  and
experience in basic science, biotechnology, medicinal chemistry, and clinical development. Over the last ten years, our team has identified mechanisms that
can selectively eliminate senescent cells, created potent senolytic molecules, and developed proprietary animal models to monitor senescent cell clearance.
We have developed significant insight into the relationship between the accumulation of senescent cells and human disease. Further, our management team
has extensive biotechnology and pharmaceutical experience and has played a leadership role in the creation of numerous FDA-approved medicines.

Opportunistically expanding our product portfolio.    Our internal research has identified multiple biological pathways that are potential targets for diseases
of aging. We will search for opportunities to in-license novel medicines and technology platforms that we can rapidly advance into clinical development. We
expect that our current leadership in the field of cellular senescence biology will serve as a foundation for us to develop numerous products to treat human
disease.

Continuing to build a robust and defensible patent portfolio.    We are an innovative biotechnology company focused on developing novel insights into the
biology of diseases of aging. Our current patent portfolio consists, on a worldwide basis, of more than 150 patents and pending applications in the United
States and in foreign jurisdictions.  This includes 43 issued and allowed U.S. patents and patent applications and 32 granted and allowed foreign patents and
applications respectively.  We intend to continue to aggressively develop, file, and pursue additional patent protection for our innovative technologies and
products.

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Targeting Cellular Senescence

Our Approach to Slowing, Halting, or Reversing Diseases of Aging

Cellular  senescence  is  a  natural  biological  state  in  which  a  cell  permanently  halts  division.  Cells  become  senescent  when  they  experience  some  form  of
unresolvable  cellular  stress.  These  cellular  stress  events  result  in  the  activation  of  the  tumor  suppressor  protein  p53,  which  drives  the  production  of  two  cell-cycle
dependent kinase inhibitors, or CDK inhibitors, p21 and p16. These two molecules are required for the establishment and subsequent maintenance of the senescent cell
state. The first CDK inhibitor to be produced is p21, which works through subsequent pathways to block the production of numerous proteins that cells need to divide.
The initial p21-driven signal is an acute response to cell damage and eventually decreases. In contrast, p16 permanently locks the cell into a non-dividing state and the
production of p16 continues as long as the cell lives. Given that p16 production, in most cases, continues indefinitely and is believed to be produced almost exclusively
in senescent cells, it is a widely used marker to identify and quantify senescent cells.

The process through which stress mechanisms can induce cells to become senescent is illustrated in the figure below.

Figure 2: Illustration of induction of the senescent state and secretion of factors that can damage the microenvironment

How Senescent Cells Drive Diseases of Aging

Once cells become senescent, they begin secreting large quantities of proteins, including pro-inflammatory factors that recruit the immune system, proteases
that  remodel  the  extra-cellular  matrix,  pro-fibrotic  factors  that  drive  the  formation  of  dysfunctional  matrix,  and  growth  factors  that  perturb  the  function  of  the  tissue
micro-environment. This collection of secreted proteins is referred to as the Senescence Associated Secretory Phenotype, or SASP. In addition to affecting normal tissue
function,  the  SASP  contains  factors  that  induce  senescence  in  neighboring  cells,  setting  off  a  cascade  of  events  that  ultimately  culminates  in  the  formation  of  a
functionally aged and/or diseased tissue that underlies a variety of age-related diseases.

Numerous SASP factors have been implicated as potentially contributing to human disease and it is now believed that the SASP is the primary means by
which senescent cells drive specific diseases of aging. For example, a variety of single SASP factors (e.g., TNF-α and VEGF-A) have been demonstrated to drive human
diseases by themselves and have been the target of well-known antibody therapeutics, including HUMIRA® and EYLEA®. While these antibodies are able to modify
human  disease  by  removing  the  activity  of  a  single  factor,  we  believe  the  clearance  of  senescent  cells  will  remove  the  source  of  numerous  SASP  factors,  providing
improvement in both efficacy and duration-of-effect.  

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Our Therapeutic Paradigm

We were founded on the principle that the selective elimination of senescent cells and their accompanying SASP has the potential to slow, halt, or reverse
diseases  of  aging.  Our  insights  into  senescent  cell  biology  allow  us  to  identify  senescence-driven  diseases,  target  the  senescent  cells  driving  a  particular  disease,  and
selectively eliminate these cells. The figure below illustrates this process.

Figure 3: Illustration of the senolytic therapeutic hypothesis

In developing this approach, we have acquired significant expertise with respect to senescent cell survival pathways, which are the signaling systems that
senescent cells rely on for survival. When these pathways are targeted with specifically designed molecules, senescent cells undergo programmed cell death. Through our
research, we have identified several of these mechanistically distinct survival pathways, which differ depending on cell type and the tissue in which the senescent cells
reside.

Advantages of Our Approach

We believe that senolytic medicines that selectively eliminate senescent cells from diseased tissues may have several advantages over other efforts to treat

diseases of aging:

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Senolytic medicines target a root cause of diseases of aging.    We believe that the accumulation of senescent cells is a root cause of many diseases of aging.
Unlike treatments that inhibit the activity of a single factor (such as antibodies targeting single pro-inflammatory proteins), we believe a senolytic medicine
that eliminates accumulated senescent cells and consequently also their associated SASP, could blunt the activity of numerous factors contributing to disease.
As a result, senolytic medicines could have improved efficacy because they target diseases at their source and therefore may be able to normalize tissue levels
of numerous disease-causing factors simultaneously.

Senolytic medicines can be dosed intermittently.    The administration of senolytic medicines would remove senescent cells from diseased tissue. As new
senescent cells may take months or perhaps years to re-

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accumulate, senolytic medicines could potentially be dosed infrequently. Intermittent dosing may also improve drug tolerability and patient adherence when
compared to chronic therapies.

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Senolytic  medicines  restore  tissues  to  a  healthy  state.        We  believe  senescent  cells  generally  do  not  accumulate  in  young  individuals  and  that  the
accumulation of senescent cells in older individuals interferes with normal tissue function. Our goal for the administration of senolytic medicines is to restore
tissue to a functionally younger state.

Our Discovery and Development Strategy

We believe that each of our senolytic programs has the potential to address a root cause of an age-related disease. Our clinical development strategy is initially
to develop senolytic medicines designed to be administered locally into diseased tissue, which reduces systemic toxicological risks by limiting drug exposure primarily to
the treated tissue. Our initial focus is on ophthalmologic and neurologic diseases. After demonstrating safety and efficacy in indications amenable to localized therapy,
we plan to pursue the development of senolytic medicines that could be administered systemically, initially acting on specific tissues for which direct local administration
is challenging. Ultimately, we envision the potential for systemic administration of senolytic medicines to selectively eliminate senescent cells throughout the body to
treat diseases of aging that are not amenable to local treatment, such as liver and kidney disease.

In  addition  to  developing  therapeutics  to  target  senescent  cells,  we  are  also  exploring  other  mechanisms  that  contribute  to  diseases  of  aging.  These drug

discovery programs include a Tie2 receptor agonistic antibody designed to treat eye disease and α-Klotho hormone to treat cognitive disorders.

Ophthalmology Programs Targeting Cellular Senescence

Unmet Need and Therapeutic Rationale

Our Programs

The majority of significant eye diseases are age-related, with the prevalence of vision-threatening disease increasing significantly over the age of 75. Of the
285 million individuals worldwide living with visual impairment, 65% are over the age of 50. The individual diseases that are associated with these figures include age-
related macular degeneration, diabetic macular edema, and diabetic eye diseases, all of which have a high prevalence and significant unmet need in either prevention or
therapeutic  options.  The  diseases  we  are  evaluating  as  initial  target  indications  for  local  administration  of  senolytic  therapy  in  the  eye  are  age-related  macular
degeneration, diabetic macular edema, and diabetic retinopathy.

Diabetic Macular Edema

Diabetic  macular  edema  is  a  condition  in  which  the  metabolic  abnormalities  associated  with  diabetes,  including  high  levels  of  blood  glucose,  or
hyperglycemia,  damage  blood  vessels  in  the  central  portion  of  the  retina,  or  the  macula,  causing  those  vessels  to  leak  fluid.  The  leaking  fluid  leads  to  swelling  and
subsequently to abnormalities of vision. The prevalence of diabetic macular edema, or DME, in the United States ranges from approximately 4.0% to 6.8% of people
with diabetes who are 40 years of age or older. In 2019, it was estimated that more than 20 million people worldwide are affected by DME. There is a high burden of
DME among non-Hispanic blacks and robust associations with higher hemoglobin A1c and longer duration of underlying diabetes.

Despite  the  success  achieved  with  anti-VEGF  treatment  for  retinal  disease  like  AMD  that  involve  the  proliferation  of  abnormal  blood  vessels,  or
neovascularization, the impact of such treatment in DME has been more limited. This is due to the challenging nature of the therapeutic regimen (which entails monthly
and or bimonthly IVT injections for up to two years), the number of cases that are refractory to anti-VEGF treatment (approximately 50% of DME patients), and the
long-term complications of increased ischemia and retinal fibrosis associated with long-term treatment with anti-VEGF injections. As a result, there is an unmet need in
this group of patients.

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Although VEGF has been identified as a major factor for neovascular disease, other factors, which we believe include SASP factors, are present in DME, including IL-
1ß, TNF-a, IL-6, and TGF-ß, among others. Due to the multifactorial nature of the disease, a significant opportunity exists to develop a more comprehensive approach to
the treatment of DME, such as senolysis, that targets the root cause of the disease.

Age-Related Macular Degeneration

Age-related macular degeneration, or AMD, is the leading cause of irreversible vision loss in developed countries, particularly in people older than 60 years.
In 2014, it was projected that by 2020 the number of people worldwide with AMD would be 196 million and could increase to 288 million by 2040. The prevalence of
AMD increases significantly with advancing age, with a prevalence rate of 1.63% in those aged 65 to 69 years which increases to 11.73% in those aged 80 years or older.
AMD  affects  central  vision,  impairing  functions  such  as  reading,  driving,  and  facial  recognition,  and  has  a  major  impact  on  quality  of  life  and  the  ability  to  live
independently. AMD is defined in three stages: (i) “early,” in which visual function is affected in the presence of signs of age-related changes in the retina such as drusen
and pigmentary changes; (ii) “intermediate,” in which increasing degrees of macular lipid deposition and structural changes are noted; and (iii) “late,” in which central
vision is compromised due to abnormal blood vessel growth (known as “wet” AMD) or advanced atrophy of the retina (known as “dry” AMD). AMD is a heterogenous,
complex, multifactorial disease, with inflammatory, degenerative, genetic, and vascular factors all contributing to its development and progression. The potential role of
senescent cells and the associated SASP in driving the two main presentations of the disease, both wet and dry forms, could prove a unifying mechanism across this
complex disorder.

Current standard of care for AMD is the administration of anti-vascular endothelial growth factor, or anti-VEGF, antibody drugs which control aspects of the
wet form of the disease only. The development of therapeutic options for dry AMD has proven to be challenging and currently there are no approved therapies available
to halt progression or reverse disease. And while wet AMD has been significantly impacted by anti-VEGF therapy, that approach is limited by the need for frequent eye
injections over a long period of time, a significant percentage of patients not completing or being non-responsive or poorly-responsive to anti-VEGF therapy, and the
contribution  of  multiple  other  mechanisms  at  play  in  the  disease  beyond  VEGF.  Thus,  there  is  considerable  potential  for  a  senolytic  approach  to  impact  disease
progression  and  achieve  stabilization  in  AMD  via  modulation  of  senescent  cell  burden  and  the  accompanying  SASP.  SASP  factors  in  AMD  include  molecules  that
promote  abnormal  blood  vessel  growth,  inflammation,  and  fibrosis,  all  of  which  have  been  implicated  in  various  stages  of  the  disease.  We  believe  that  a  senolytic
medicine could have a meaningful and prolonged impact on the AMD disease state and help restore the cellular microenvironment to a more normal, pre-senescent state.

Diabetic Retinopathy

Diabetic retinopathy, or DR, is estimated to affect over 90 million people globally and approximately 28 million have vision-threatening stages of disease. It is
a leading cause of vision loss in middle-aged and elderly people and impacts 8% of the U.S. population over age 65. Due to the increasing diabetic population arising
from lifestyle changes in developing countries, the disease incidence is predicted to climb.

Diabetic  retinopathy  is  a  complex  multifactorial  disease,  characterized  by  progression  through  a  series  of  stages  of  increasing  severity.  The  metabolic
abnormalities  associated  with  diabetes  incite  a  variety  of  inflammatory  and  metabolic  stress-induced  events  which  leads  to  proliferation  of  new  blood  vessels  and
subsequent bleeding and swelling, which in turn causes scarring and vision loss or may lead to blood vessel occlusion, limiting blood flow and leading to damage to the
retinal photoreceptors and nerves supplied by those vessels. The risk of developing diabetic retinopathy and its severity increase with the duration of underlying diabetes.
It is also associated with poor glycemic control and the presence of additional coexistent diseases, such as high blood pressure, high cholesterol levels, and impaired
kidney function.

Current  standard  of  care  for  diabetic  retinopathy,  which  includes  blood  sugar  control,  anti-VEGF  drugs,  steroid  injections,  and  laser  therapy,  is  modestly
effective.  The  limitations  of  existing  therapy  include  general  challenges  with  achieving  diabetes  control,  the  need  for  frequent  intravitreal  injections  for  the
administration of anti-VEGF therapy, a significant percentage of patients not completing or being non-responsive to anti-VEGF therapy,

11

 
and  tissue  destruction  with  permanent  side  effects  from  laser  therapy.  This  presents  a  significant  opportunity  to  design  and  develop  a  treatment  paradigm,  such  as
senolysis, that treats a root cause of the disease.

Evidence suggests that diabetic retinopathy is driven by the accumulation of senescent cells that are a direct result of elevated glucose levels in patients with
diabetes. These senescent cells are triggered by local stresses in the retina and their accumulation drives the production of the accompanying ocular SASP factors, VEGF
and  platelet-derived  growth  factor,  or  PDGF.  Overproduction  of  VEGF  and  IL-6  leads  to  ocular  inflammation  and  abnormal  blood  vessel  growth,  key  signatures  of
diabetic  retinopathy.  Thus,  a  senolytic  approach  could  target  multiple  aspects  of  the  underlying  causes  of  diabetic  retinopathy  and  ideally  lead  to  greater  therapeutic
coverage in a wider range of patients. This elimination of senescent cell accumulation and accompanying SASP factors could limit further disease progression, reduce
vessel leakage and inflammation, and prevent vision loss.

Evidence for Senescence Burden in Human Disease and Human Biomarker Discovery: AMD, DR and DME

We  evaluated  the  presence  of  senescent  cells  by  IHC  staining  for  p16  in  post-mortem  retinal  donor  tissue  from  individuals  who  carried  a  pre-mortem
diagnosis  of  AMD,  DR/DME,  or  neither.  We  believe  the  resulting  data  support  our  hypothesis  that  the  accumulation  of  senescent  cells  is  linked  to  AMD  and
DR/DME.    Quantification  of  IHC  images  indicated  a  significant  increase  in  senescent  cell  burden  (as  measured  by  p16+  cells)  in  both  AMD  and  DR  patient  globes
(Figure 4).  

Figure 4: Quantification of senescent cell burden in AMD and DR/DME

We also compared the presence of senescence in human retinal microvascular endothelial cells, or HRMEC, versus retinal donor tissue from human DME/DR
patients by evaluating the gene expression of several disease-relevant factors. Quantitative polymerase chain reaction, or qPCR, demonstrated elevations in the SASP
factors  VEGF,  PDGF,  IL1B,  and  TNF  in  senescent  HRMEC,  relative  to  non-senescent  cells.  These  disease-relevant  mediators  have  been  reported  to  be  elevated  in
DME/DR patients. We believe this data is consistent with our hypothesis that senescent cell accumulation and SASP factors play a central role in both DME and DR.

Mechanism of Action of UBX1325 and UBX1967 (Inhibitors of the Bcl-2 Family)

UBX1325, our lead drug candidate, and UBX1967, our back-up compound, in our ophthalmology program, are potent small molecule inhibitors of specific
members of the Bcl-2 family of apoptosis regulating proteins. The B-cell lymphoma 2, or Bcl-2, gene family encodes more than 20 proteins that regulate the intrinsic
apoptosis pathway and are fundamental to the balance between cell survival and cell death. Inhibition of certain Bcl-2 family proteins results in cell death in certain cell
types. Targeting this pathway has been studied extensively in connection with the search for new oncology medicines.  

12

 
 
In Vitro and In Vivo Pharmacology Studies with UBX1325

We conducted an in vitro assessment of binding and efficacy of UBX1325 to determine both its potency for the Bcl-2 family protein targets and its potency at
eliminating senescent cells. Biochemical assays for Bcl-2, Bcl-xL, and Bcl-w yielded binding affinities in the sub-nanomolar range. UBX1325 is a phosphate pro-drug
that releases the active parent molecule known as UBX0601.  In order to assess the activity of UBX0601 on senescent cells, we used a cell-based assay with radiation-
induced  senescence.  Senescent  cells  were  exposed  to  increasing  concentrations  of  UBX0601  for  72  hours.  In  this  study,  UBX0601  showed  potent,  concentration-
dependent  senolytic  activity  against  human  foetal  lung  cells,  or  IMR90,  primary  human  umbilical  vein  endothelial  cells,  or  HUVEC,  and  HRMEC  as  measured  by
reduction of senescent cell survival. UBX0601 also demonstrated selectivity for elimination of senescent HRMEC over non-senescent HRMEC which is observed as
decreased potency in the non-senescent HRMEC (Figure 5).

Figure 5: Concentration- dependent induction of apoptosis in HRMEC cells by UBX0601 in vitro

We  next  studied  the  effects  of  UBX1325  in  the  retina  in  an  in vivo  model.  We  employed  the  mouse  oxygen-induced  retinopathy,  or  OIR,  model,  which
provides an in vivo model of retinopathy of prematurity, or ROP, and DR. In this model, UBX1325 demonstrated a statistically significant improvement in the degree of
retinal neovascularization (Figure 6).

Figure 6: Intravitreal injection of UBX1325 reduced retinal neovascularization in the mouse OIR model

Based on these results in this key OIR model, we believe a single ocular injection of UBX1325 has the potential to functionally inhibit neovascularization and
promote  vascular  repair.  We  believe  the  efficacy  of  UBX1325  in  this  OIR  model  is  due  to  elimination  of  senescent  cells  and  accompanying  SASP  that  propagates
senescence in retinal cells and promotes neovascularization of retinal vessels.

13

 
 
We then studied the in vivo efficacy of UBX1325 in a streptozotocin-induced diabetic mouse,  or  STZ,  model  to  understand  its  effects  in  a  diabetic  retina,
which shows phenotypes similar to the human diseased condition. In this STZ model, UBX1325 demonstrated a significant reduction in vascular leakage as measured by
Evans Blue dye permeation (Figure 7A). UBX1325 also demonstrated an improvement in the electroretinogram, or ERG, as a measure of retinal/photoreceptor function
(Figure  7B).  At  a  dose  of  200  pmol  delivered  per  eye,  UBX1325  led  to  significant  increase  in  the  amplitude  of  both  the  A-  and  B-waves  (p<0.01  and  p<0.0001,
respectively) of the ERG when compared to the vehicle control group.  Lastly, the expression of several disease-relevant cytokines were elevated in the diabetic retina,
but attenuation of those factors was not observed after administration of UBX1325.

Figure 7:  Streptozotocin-induced diabetic mice have increased retinal vascular leakage (7A) and decreased A-wave amplitude in ERG (7B).  Administration of UBX1325 attenuated each
of these disease-relevant endpoints.

Non-clinical toxicology studies of UBX1325, as well as its manufacturing and associated testing, have been completed to support the evaluation of the safety,

tolerability, and pharmacokinetics of this molecule in a Phase 1 clinical study.  

In vitro and in vivo Pharmacology Studies with UBX1967

We conducted an in vitro assessment of binding and efficacy of UBX1967 to determine both its potency for the Bcl-2 family protein targets and its potency at
eliminating senescent cells. In order to assess the activity of UBX1967 on senescent cells, we used a cell-based assay with radiation-induced senescence. Senescent cells
were  exposed  to  increasing  concentrations  of  UBX1967  for  72  hours.  In  this  study,  UBX1967  showed  potent,  dose-dependent  senolytic  activity  against  IMR90  and
HRMEC as measured by reduction of senescent cell survival. UBX1967 also demonstrated selectivity for elimination of senescent HRMEC over non-senescent HRMEC
which is observed as decreased potency in the non-senescent HRMEC (Figure 8).

Figure 8: Concentration- dependent induction of apoptosis in HRMEC cells by UBX1967

14

 
 
 
 
 
We next studied the effects of an intravitreal injection of UBX1967 in mice in the OIR model, which provides an in vivo model of ROP and DR. In this model,

UBX1967 demonstrated a statistically significant improvement in the degree of neovascularization of the retina at all dose levels (Figure 9).

Figure 9: Intravitreal injection of UBX1967 reduced retinal neovascularization in the mouse OIR model

Based on the results in this key OIR model, we believe a single ocular injection of UBX1967 has the potential to functionally inhibit pathogenic angiogenesis
and promote vascular repair (Figure 10). We believe the efficacy of UBX1967 in the OIR model is due to elimination of senescent cells and accompanying SASP that
propagates senescence in retinal cells and promotes neovascularization of retinal vessels.

Figure 10: Representative images from mouse OIR illustrate the reduction in neovascularization and vaso-obliteration after treatment with UBX1967

We then studied in vivo efficacy of UBX1967 in the STZ mouse model to understand its effects in a diabetic retina. In this model, UBX1967 demonstrated a
reduction in vascular leakage as measured by Evans Blue dye permeation. Intravitreal administration of UBX1967 significantly reversed leakage in the DMSO-based
formulation (p<0.01) and demonstrated dose-dependent reversal in the PS-80-based formulation, although not statistically significant. UBX1967 also demonstrated an
improvement in the ERG at all doses. At dose levels of between 2 – 200pmol delivered per eye, UBX1967 led to significant increase in the amplitude of both the A- and
B-waves (p<0.001 and p<0.0001, respectively) of the ERG when compared to the vehicle control group.  The ERG amplitudes of UBX1967-treated groups were not
significantly different from the non-diabetic control animals.  

15

 
 
 
Finally, UBX1967 demonstrated a dose dependent reduction in the expression of several disease-relevant cytokines, namely IL1B (2 – 200pmol) and TNF

mRNA (p<0.05 v. vehicle control) in the diabetic retina.  

Figure 11:  Streptozotocin-induced diabetic mice have increased retinal vascular leakage (top left), decreased A-wave amplitude in ERG (top right), and increased cytokine expression
(lower panel).  Administration of UBX1967 attenuated each of these disease-relevant endpoints.

We are in the final phases of IND-enabling non-clinical toxicology studies of UBX1967 to evaluate its safety and tolerability.  Manufacturing and testing of

UBX1967 to support the initiation of clinical studies of UBX1967 is nearing completion.

Ophthalmology Development Plan for UBX1325

In  July  2020,  we  filed  an  Investigational  New  Drug  application,  or  IND,  to  commence  a  Phase  1  study  of  UBX1325  in  patients  with  DME  or  AMD.  We
initiated  a  Phase  1  clinical  study  of  UBX1325  and  dosed  the  first  patient  in  October  2020.  The  Phase  1,  first-in-human,  open-label,  single-ascending  dose  study  is
designed to evaluate the safety, tolerability, and pharmacokinetics of UBX1325 in patients with DME or AMD. The trial is designed to enroll approximately 21 patients,
with initial safety and tolerability data expected in the first half of 2021. We also anticipate initiating a Phase 2a proof of concept study in the first half of 2021, with
preliminary results expected in the first half of 2022.

16

 
 
As part of our continued commitment to our ophthalmology indications, we also continue to design alternative senolytic molecules with differing mechanisms
of  action.  We  are  also  focused  on  the  physiochemical  properties  of  our  small  molecules  and  are  developing  approaches  to  optimize  solubility,  permeability,  and
pharmacokinetic, or PK, parameters to create favorable ocular absorption, distribution, metabolism, and residency profiles.  

Ophthalmology Program Targeting Tie2 Signaling

The angiopoietin-Tie2 signaling axis is believed to play a fundamental role in vascular biology. Dysregulation of the expression of Tie2-regulating ligands
angiopoietin-2 (a context dependent Tie2 antagonist ligand) and angiopoietin-1 (a Tie2 agonist ligand) has been observed in the vitreous of patients with DME, AMD,
and  other  ocular  diseases.  We  believe  that  a  highly  specific  and  potent  Tie2-activating  antibody  will  restore  Tie2  signaling  in  ocular  tissues,  potentially  leading  to
decreased vascular leak, lower levels of pathogenic angiogenesis, and a restoration of healthy blood vessels in ischemic areas of the eye. UBX2050 is an investigational
Tie2-specific  agonist  monoclonal  antibody  that  was  selected  based  on  its  optimal  binding  and  functional  properties  observed  in  in  vitro  assays.  In  primary  human
endothelial cells (HUVECs), UBX2050 treatment activated Tie2 as measured by increased levels of cellular phospho-Tie2, and potently activated downstream signal
transduction pathways as measured by increased levels of phospho-Akt and phospho-Erk1/2 by western blotting (Figure 12).

Figure 12. Anti-Tie2 agonist antibody Tie2-3 (UBX2050) activated Tie2 signaling with a potency comparable to angiopoietin-1 in primary endothelial cells in vitro.

The  in  vivo  activity  of  UBX2050  has  been  explored  in  a  laser-induced  choroidal  neovascularization  model  in  mice.  In  this  model,  UBX2050  was
administered  to  mice  via  the  intraperitoneal  route  at  a  dose  of  10  mg/kg,  one  day  prior  to  laser-induced  rupture  of  Bruch’s  membrane.  UBX2050  treatment,  but  not
treatment with a non-specific isotype control antibody, significantly inhibited the area of choroidal neovascularization nine days post-injury as measured in retina/choroid
flat mounts from treated animals (Figure 13). Based on this data, we believe UBX2050 has the potential to address pathogenic angiogenesis in the eyes of patients with
ocular diseases such as AMD and DME.

17

 
Figure 13. UBX2050 treatment significantly inhibited choroidal neovascularization in a laser-induced injury model in mice.

Additional  preclinical  studies  exploring  the  activity  and  tolerability  of  UBX2050  are  ongoing  to  support  the  initiation  of  IND-enabling  activities  in  the

second half of 2021.

Neurology Program Targeting Cognition

α-Klotho Hormone

We are also evaluating the administration of α-Klotho hormone for the potential treatment of diseases of aging.  First discovered in 1997, the klotho gene was
identified  in  mice  as  an  “aging-suppressor”  that  accelerates  aging  when  disrupted  and  extends  lifespan  when  overexpressed.  The  α-Klotho  hormone  is  a  circulating
hormone primarily produced in the kidneys and choroid plexus of the brain and was recently discovered to delay and suppress the deleterious effects of aging on multiple
organs,  including  the  brain.  Circulating  levels  of  α-Klotho  hormone  gradually  decline  with  age  and  are  implicated  in  chronic  stress,  cognitive  impairment,  and
neurodegenerative disease.

A small percentage of the population possesses naturally elevated α-Klotho levels as a result of the α-Klotho-VS heterozygous genetic variation. α-Klotho-VS
heterozygosity  is  associated  with  enhanced  cognition,  and  less  age-related  cognitive  decline.  Elevated  α-Klotho  levels  are  also  associated  with  greater  dorsolateral
prefrontal cortex volume and improved connectivity between cortical regions, which in turn correlates with better executive function in normal aging humans. As this
brain region is especially susceptible to shrinkage with age and vulnerable in several psychiatric and neurological disorders, its protection may provide clinical benefit in
both normal aging and disease.

In 2014, Dena Dubal, of the University of California, San Francisco, and one of our former scientific collaborators, first observed that genetically elevated α-
Klotho levels significantly enhanced cognitive performance and neural resilience independent of age in normal and human amyloid precursor protein mouse models of
neurodegenerative disease related to Alzheimer’s Disease. α-Klotho is hypothesized to optimize synaptic neurotransmission of NMDA receptors in the brain, potentially
combatting the cognitive and synaptic deficits, despite high levels of pathogenic Ab, tau, and phosphorylated tau proteins associated with Alzheimer’s Disease.

We  have  observed  therapeutic  activity,  pharmacokinetics,  and  pharmacodynamics  of  recombinant  α-Klotho  in  multiple  preclinical  rodent  and  non-human
primate models of neurodegenerative and neuropsychiatric disease. Activity of UBX2089, our α-Klotho drug candidate, continues to be explored in preclinical animal
models of cognition and neurological function, with the intention of advancing a drug candidate to human studies.  

18

 
Neurology Program Targeting Senescent Cells in Neurodegenerative Disease

We believe cellular senescence may play a fundamental role in neurodegeneration. Multiple lines of evidence suggest that senescent cells accumulate in the
nervous  system  during  normal  aging  and  neurodegenerative  disease.  While  the  brain  is  composed  of  a  diversity  of  post-mitotic  (e.g.  neurons)  and  proliferative  (e.g.
astrocytes,  microglia,  oligodendrocytes,  endothelial  cells,  pericytes,  neural  progenitor  cells,  etc.)  cells,  glia  appear  to  be  uniquely  prone  to  enter  a  senescent  state.
Interestingly,  neurons  do  not  readily  express  canonical  markers  of  senescence,  perhaps  due  to  their  terminally  differentiated  state.  In  the  human  cortex,  a  significant
increase in p16 positive astrocytes has been observed in advanced age (78-90 years) relative to middle age (35-50 years) individuals. Cellular senescence has also been
shown to be a hallmark of multiple neurodegenerative diseases. The appearance of senescent cells precedes the formation of neurofibrillary tangles and phosphorylated
tau in the cortex of both human Alzheimer’s Disease and the mouse P301S MAPT tauopathy/FTD model, suggesting that cellular senescence may be an early driver of
disease  pathophysiology.  In  Parkinson’s  Disease,  elevated  levels  of  p16  and  several  SASP  factors  have  been  detected  in  the  human  substantia  nigra  pars  compacta,
providing  further  evidence  that  astrocytes  are  prone  to  a  senescent  phenotype.  Senescent  astrocytes  expressing  elevated  levels  of  p16,  p21,  and  IL6  have  also  been
detected in the human Amyotrophic Lateral Sclerosis brain and spinal cord.

Several  preclinical  third-party  proof  of  concept  studies  in  mouse  models  of  aging  and  neurodegeneration  have  provided  preliminary  evidence  that  the
removal of senescent cells via senolytic drugs or genetic methods can improve brain function. These early proof of concept studies provide encouraging evidence that
senolysis  can  ameliorate  the  pathophysiology  associated  with  neurodegeneration.    We  are  focused  on  further  development  of  our  neurobiology  platform,  including
studying human brain samples to elucidate the role of senescence in neurodegeneration pathophysiology and advanced preclinical screening and testing systems. We are
currently pursuing our lead senolytic targets in multiple neurology indications.

Other Programs Targeting Diseases of Aging

We have secured a leading position in the discovery and development of senolytic medicines through our commitment to fundamental biological research and
translational science. We have partnered with key academics and thought leaders to pursue areas of emerging aging science. We continue to recruit top-tier scientists with
the desire and drive to understand, uncover, and invent. We invest a significant proportion of our resources and effort in emerging fields of aging science in order to
transition fundamental scientific observations to the design and development of new therapeutics. We believe that we have built the internal research capabilities and
scientific network to continue to be at the forefront of slowing, halting, or reversing diseases of aging.

In  addition  to  our  discovery  and  development  of  locally  administered  senolytic  medicines,  we  are  investigating  the  systemic  administration  of  senolytic
medicines for the treatment of senescent cell-driven disease within specific organs, tissues, and cell types that are not amenable to local treatment. Our first approach to
systemic administration is to create a senolytic medicine that is designed to target a specific organ or even specific tissue within that organ. Such a senolytic medicine
would selectively eliminate senescent cells within a tissue and reduce the SASP within that tissue. In considering therapeutic areas with unmet need and where there is
strong evidence for the role of senescent cells driving disease, we are evaluating liver and kidney disease, as well as other indications.

Our long-term goal is to use the principles that we establish for the design of systemically administered, targeted senolytic medicines to produce a pipeline of
clinical candidates to eliminate senescent cells throughout the body. This could draw on ideas from immunology, senolytic viruses, vaccines, CAR-T type approaches or
antibody drug conjugates.

Our success as a company will depend on our ability to deliver reliable, high-quality preclinical and clinical drug supply. As we mature as a company and
approach commercial stage operations, securing reliable high-quality commercial drug supply will be critical. We contract with third parties for the manufacture of our
drug candidates for clinical studies. Because we rely on contract manufacturers, we employ personnel with extensive technical, manufacturing, analytical, and quality
experience. Our staff has strong project management discipline to oversee

Manufacturing

19

 
 
 
contract manufacturing and testing activities, and to compile manufacturing and quality information for our regulatory submissions.

Manufacturing  is  subject  to  extensive  regulation  that  imposes  various  procedural  and  documentation  requirements  and  that  governs  record  keeping,
manufacturing processes and controls, personnel, quality control and quality assurance, and more. Our systems and our contractors are required to be in compliance with
these regulations, and compliance is assessed regularly through monitoring of performance and a formal audit program.

Our  current  supply  chains  for  our  lead  drug  candidates  involve  several  manufacturers  that  specialize  in  specific  operations  of  the  manufacturing  process,
specifically, raw materials manufacturing, drug substance manufacturing, drug product manufacturing, and drug product labeling, packaging, and storage. We currently
operate under purchase order programs for our drug candidates with Material Service Agreements in place, and we intend to establish long-term supply agreements in the
future. We believe our current manufacturers have the scale, the systems, and the experience to supply all planned clinical studies.

We do not currently require commercial manufacturing capabilities. Should our needs change, we will likely need to scale up our manufacturing processes to
enable commercial launch. To ensure continuity in our supply chain, we plan to establish supply arrangements with alternative larger scale suppliers for certain portions
of our supply chain, as appropriate.

We  do  not  currently  have,  nor  do  we  expect  to  have  in  the  near  term,  any  FDA-approved  drugs  in  our  portfolio.  Therefore,  we  have  not  yet  built  an

infrastructure for sales, marketing, or commercial distribution.

Should any of our drug candidates move into pivotal clinical trials intended to support an application for market authorization, we intend to develop a plan to

commercialize them in the United States and other key markets, through an internal infrastructure or external partnerships.

Commercialization Plan

Competition

The  biotechnology  and  pharmaceutical  industries,  including  the  field  of  research  in  aging,  are  typically  rife  with  rapid  technological  developments,  bold
competition,  and  dependence  on  intellectual  property.  Like  any  biotechnology  company,  we  face  competition  from  multiple  sources,  including  large  or  established
pharmaceutical, biotechnology, and wellness companies, academic research institutions, government agencies, and private institutions. We believe our drug candidates
will prevail amid the competitive landscape through their efficacy, safety, administration methods and convenience, cost, public and institutional demand, intellectual
property portfolio, and treatment of the root cause of many diseases of aging.

We are aware of other companies seeking to develop treatments to prevent or treat diseases of aging through various biological pathways, including several
large pharmaceutical companies that have exploratory programs as well as a number of earlier-stage companies. Most of these companies are either in early stages of
discovery research in senescence or have not yet disclosed pipeline candidates or mechanisms of interest, and those companies that have disclosed pipeline candidates are
targeting other pathways. Hence, we believe that we currently have the most advanced program addressing cellular senescence.

Our  drug  candidates  are  likely  to  compete  against  current  therapies  from  a  wide  range  of  companies  and  technologies,  including  therapies  for  our  lead

indications:

•

Ophthalmology  diseases,  including  diabetic  retinopathy:  current  standard  of  care  treatments  include  anti-VEGF  antibodies  (bevacizumab,  ranibizumab,
aflibercept, brolucizumab); intravitreal steroid (dexamethasone); and pan-retinal photocoagulation by laser for both neovascular AMD, DR, and DME. There
is no currently available treatment for geographic atrophy form of AMD. There are potentially disease-modifying therapeutics are being developed by several
pharmaceutical and biotechnology companies, including Roche/Genentech and Regeneron.

20

 
 
•

Cognitive diseases, including those resulting from neurodegenerative disorders such as Parkinson’s Disease or Alzheimer’s Disease, or from mood disorders
such as schizophrenia, or depression. Drugs to slow cognitive decline in Alzheimer’s Disease are limited to acetylcholinesterase inhibitors (e.g., donepezil)
and memantine, the action of which is poorly defined. In both cases, the overall treatment effect is low so that the medical need in remains exceedingly high.
For the cognitive impact of Parkinson’s Disease and mood disorders, there are no approved therapies currently available.

Many  of  our  competitors,  either  alone  or  with  strategic  partners,  have  substantially  greater  financial,  technical,  and  human  resources  than  we  do.
Accordingly,  our  competitors  may  be  more  successful  in  obtaining  approval  for  treatments  and  achieving  widespread  market  acceptance,  rendering  our  treatments
obsolete  or  non-competitive.  Accelerated  merger  and  acquisition  activity  in  the  biotechnology  and  biopharmaceutical  industries  may  result  in  even  more  resources
concentrated  among  a  smaller  number  of  our  competitors.  These  companies  also  compete  with  us  in  recruiting  and  retaining  qualified  scientific  and  management
personnel, establishing clinical study sites, patient registration for clinical studies, and acquiring technologies complementary to, or necessary for, our programs. Smaller
or  early-stage  companies  may  also  prove  to  be  significant  competitors,  particularly  through  collaborative  arrangements  with  large  and  established  companies.  Our
commercial  opportunity  could  be  substantially  limited  in  the  event  that  our  competitors  develop  and  commercialize  products  that  are  more  effective,  safer,  more
tolerable,  more  convenient,  or  less  expensive  than  our  comparable  products.  In  geographies  that  are  critical  to  our  commercial  success,  competitors  may  also  obtain
regulatory approvals before us, resulting in our competitors building a strong market position in advance of our products’ entry. We believe the factors determining the
success of our programs will be the efficacy, safety, and convenience of our drug candidates.

Our  success  depends  in  large  part  upon  our  ability  to  obtain  and  maintain  proprietary  protection  for  our  products  and  technologies  and  to  operate  without
infringing the proprietary rights of others. Our policy is to protect our proprietary position by, among other methods, filing U.S. and foreign patent applications that relate
to our proprietary technologies, inventions and improvements that are important to the development and implementation of our business. We also rely on trademarks,
know-how, continuing technological innovation and licensing opportunities to develop and maintain our proprietary position.

Intellectual Property

Patent Portfolio

Our  patent  portfolio  consists  of  a  combination  of  issued  and  allowed  patents  and  pending  patent  applications  that  are  owned  or  co-owned  by  us  and/or
licensed to us from third parties. The majority of these patents and applications cover our cellular senescence program, and others pertain to our programs that target
aging mechanisms beyond cellular senescence, including the administration of a Tie2 receptor agonist or α-Klotho hormone. As of March 1, 2021, we own, co-own, or
have an exclusive license in certain fields of use to more than 150 patents and pending applications in the United States and foreign jurisdictions. This portfolio includes
43 issued and allowed U.S. patents and applications and 32 granted and allowed foreign patents and applications, respectively.

In general, patents have a term of 20 years from the earliest claimed non-provisional priority date. The patent term may be extendible by up to five years in
certain countries by means of patent term extension depending on the regulatory pathway and the remaining term upon marketing approval. Certain other patents and
patent applications directed to our patent portfolio, if they were to issue, may have later expiration dates. Any pending U.S. provisional application is not eligible to
become an issued patent until, among other things, we file a non-provisional patent application within 12 months of filing the related provisional patent application.  If
we do not timely file any non-provisional patent application, we may lose our priority date with respect to our provisional patent application and any patent protection on
the inventions disclosed in our provisional patent application.

Ophthalmology Program

We have a license with Ascentage to two patent families of issued and pending composition of matter patents directed to specific Bcl-xL inhibitors including

UBX0601, the active parent molecule of our lead drug

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candidate,  UBX1325.  This  license  grants  us  exclusive  development  and  commercialization  rights  and  non-exclusive  manufacturing  rights  to  UBX1325  for  all  non-
oncology  indications  outside  of  Greater  China  (China,  Hong  Kong,  Macau  and  Taiwan).    Inside  Greater  China,  we  will  be  obligated  to  develop,  manufacture  and
commercialize  UBX1325  through  a  joint  venture  with  Ascentage.  Patents  in  these  two  patent families  have  been  granted  in  the  United States,  Korea,  New  Zealand,
South Africa, Australia, Canada, India, Singapore, Japan and Europe, and others are  pending  in  China,  India  and  Singapore.  Patents  that  issue  from  these  two  patent
families are expected to expire in 2032 and 2034, excluding any patent term adjustments or extensions.

Our license agreement with Ascentage also grants us the right to continue our preclinical development efforts with UBX1967 until the time we wish to submit
an IND for UBX1967, at which point we would be required to either enter into a separate license agreement with Ascentage covering UBX1967, the terms of which
would mirror the UBX1325 license agreement, or amend the existing license agreement to switch UBX1967 and UBX1325 such that UBX1967 becomes the licensed
compound and UBX1325 reverts to the back-up compound.  

We co-own a patent family encompassing the use of Bcl-2 and Bcl-xL inhibitors generally to treat various age-related eye diseases by targeting senescent cells
(which also covers aspects of our neurology programs) with the Buck Institute and the Mayo Clinic. We have exclusive licenses from each of the Buck Institute and the
Mayo Clinic to this patent family in the field of senescence. To date, two U.S. patents have issued in this patent family which are directed to treating age related eye
diseases, including age-related macular degeneration.  Other patent applications are pending in the United States, Australia, Canada, China, Europe, and Japan. Patents
that issue from this family are expected to expire in 2035, excluding any patent term adjustments and patent term extensions.

We solely own a patent family covering the use of UBX1325 and UBX1967 to inhibit vaso-obliteration, inhibit pathogenic angiogenesis and improve retinal
and choroidal leakage in the eye.  We have one issued U.S. patent that encompasses the use of UBX1967 to inhibit vaso-obliteration in the eye and a pending U.S. patent
application encompassing the use of either UBX1325 or UBX1967 to inhibit pathogenic angiogenesis, retinal neovascularization, or vascular leak in the eye as a result of
DR. Outside the United States, we have pending applications in Australia, Canada, China, Europe, Russia and Japan.  Future patents issued from this family would be
expected to expire in 2038 excluding any patent term adjustments and patent term extensions.

We also solely own a patent family that specifically claims the composition of matter of UBX1325 and closely related compounds, as well as general methods

of use of UBX1325.  Future patents issued from this family are expected to expire in 2039, excluding any patent term adjustments and patent term extensions.

We  solely  own  a  patent  family  that  specifically  covers  the  sequence,  epitope,  alternative  antibody  formats  and  use  of  UBX2050  not  only  for  ophthalmic
diseases,  but  also  other  indications.    Future  patents  issuing  from  this  family  are  expected  to  expire  in  2040,  excluding  any  patent  term  adjustments  and  patent  term
extensions.

Neurology Program Targeting Cognition

We have an exclusive license with The Regents of the University of California for a patent family directed to methods of treatment and the use of α-Klotho
hormone for the development of human therapeutics to treat cognitive decline. As of March 1, 2021, our patent portfolio includes three issued U.S. patents, an issued
patent in Australia and Japan, one pending patent application in each of the United States, Canada, Europe, Hong Kong, and India and two pending patent applications in
China. Patents that issue from this family are expected to expire in 2036, excluding any patent term adjustments and patent term extensions.

Neurology Program Targeting Senescent Cells in Neurodegenerative Disease

We co-own a patent family encompassing the use of Bcl-2/xL inhibitors generally to treat neurodegenerative diseases by targeting senescent cells (which also
covers aspects of our ophthalmology program) with the Buck Institute and the Mayo Clinic.  We have exclusive licenses from each of the Buck Institute and the Mayo
Clinic to this patent family in the field of senescence. Currently, we co-own a pending U.S. patent application for the use of Bcl-xL inhibition to eliminate senescent cells
to treat neurodegenerative disorders. Patents that issue from this family are expected to expire in 2035, excluding any patent term adjustments and patent term extensions.

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Other Intellectual Property

Our continuing research and development, technical know-how, and contractual arrangements supplement our intellectual property protection to maintain our
competitive position. Our policy is to require inventors who are identified on any Company-owned patent applications to assign rights to us. We also have confidentiality
agreements with our employees, consultants, and other advisors to protect our proprietary information. Our policy is to require third parties that receive material UNITY
confidential information to enter into confidentiality agreements with us.

We  also  protect  our  brand  through  procurement  of  trademark  rights.  As  of  March  1,  2021,  the  mark  UNITY  BIOTECHNOLOGY®  and  the  UNITY
BIOTECHNOLOGY® design logo are registered in both the United States, the European Union, or EU, and in Japan, as well as other foreign jurisdictions. The mark
UNITY® is also registered in the United States and in the EU. In order to supplement protection of our brand, we have also registered several internet domain names.

Description of Ascentage Agreements

Licenses and Collaborations

In February 2016, we entered into several related agreements with Ascentage Pharma Group Corp. Limited, or Ascentage, which is headquartered in Suzhou,
China and listed on the Hong Kong Stock Exchange. These agreements include: (i) a compound library and option agreement, which includes a template form of license
agreement, (ii) a license agreement covering an initial compound, APG1252, and (iii) a research services agreement.  In January 2019, we entered into another license
agreement  granting  us  development  and  commercialization  rights  to  UBX1967  and  the  right  to  continue  preclinical  development  efforts  with  UBX1325,  which  is  a
phosphate  pro-drug  that  releases  the  active  parent  molecule  known  as  UBX0601,  or  the  Original  Bcl  Agreement.   This  Original  Bcl  Agreement  was  amended  in  the
fourth quarter of 2019 to remove certain field and territory limitations and to amend the schedule of licensed patents related to UBX1967, and then amended again in the
first quarter of 2020 to further amend and restate the schedule of licensed patents.  This Original Bcl Agreement was amended a third time in June 2020 to switch the
status of UBX1967 from Licensed Compound to back-up compound, and conversely the status of UBX1325 from back-up to Licensed Compound.  

Library Agreement and License Template

The compound library and option agreement, or library agreement, gives us access to Ascentage’s existing collection of Bcl-2/xL inhibitor compounds, as
well as any additional Bcl-2/xL inhibitor compounds developed during the term of the library agreement, in order to screen such compounds for senolytic activity. The
library  agreement  permits  us  to  nominate  up  to  15  such  compounds  at  any  given  time  for  further  evaluation  and  subsequently  to  select  up  to  five  of  such  selected
compounds for preclinical development and an additional five as back-up compounds. Prior to commencing IND-enabling toxicology studies on an Ascentage compound
of  interest,  we  must  formally  designate  the  compound  as  a  development  candidate  under  the  library  agreement  and  enter  into  a  separate  license  agreement  with
Ascentage  covering  that  compound  on  the  terms  set  forth  in  the  template  form  of  license  agreement.  The  library  agreement  includes  exclusivity  provisions  that
(i)  prohibit  us  from  developing  Ascentage  Bcl-2/xL  compounds  for  oncology  indications,  (ii)  prohibit  Ascentage  from  researching  or  developing  certain  Bcl-2/xL
compounds for non-oncology indications under any circumstances, and (iii) prohibit Ascentage from researching or developing certain other Bcl-2/xL compounds for a
specified set of non-oncology indications under certain circumstances. The term of the library agreement is determined by a formula that is linked to the term of the
research  services  agreement,  and  is  expected  to  expire  in  February  2022.  The  library  agreement  may  be  terminated  by  either  party  due  to  the  other  party’s  uncured
material breach of the library agreement.

Under the terms of the template form of license agreement, Ascentage will grant us the following rights with respect to a selected Ascentage compound for all
non-oncology indications: (i) exclusive worldwide development rights, and (ii) exclusive commercialization rights outside of Greater China (China, Hong Kong, Macau
and Taiwan). Inside Greater China, we will be obligated to commercialize the licensed Ascentage compound through a joint venture with Ascentage. Ascentage will also
have the right to manufacture at least 50% of our supply

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requirements of the licensed compound, provided they achieve and maintain certain manufacturing quality standards. We will be obligated to make certain milestone
payments in the form of shares of our common stock, subject to the equity cap described below, and other milestone payments in in the form of cash, not to exceed $38.0
million per licensed product, based in each case, upon the achievement of certain clinical and commercial milestones. We will also be required to make low-single digit
royalty  payments  on  net  sales  of  the  licensed  product  under  the  agreement.  Our  royalty  payment  obligations  will  expire  on  a  country-by-country  basis  and  licensed
product-by-licensed product basis upon the later to occur of (i) the expiration of the last valid claim of a licensed patent covering such licensed product in such country,
(ii) the expiration of regulatory exclusivity for such licensed product in such country, and (iii) the tenth anniversary of the first commercial sale of such licensed product
in any country. We have the right to credit certain royalty payments that we pay to third parties with respect to certain licensed products against our royalty obligation to
Ascentage. Any license agreement may be terminated by either party due to the other party’s uncured material breach of the agreement.

Under the library agreement, we issued 133,334 shares of our common stock as an upfront license fee. Of such shares, 80% were issued to Ascentage and
20% were issued to the University of Michigan in satisfaction of Ascentage’s obligation to pay a related sublicense fee to the University of Michigan. In addition to the
shares issued pursuant to the APG1252 license agreement described below, we will also be obligated to issue an additional 133,334 shares of our common stock as an
upfront license fee to Ascentage and the University of Michigan for each of the next two license agreements. The aggregate number of shares of our common stock we
could be required to issue to Ascentage and the University of Michigan pursuant to the library agreement, the APG1252 license agreement, and any additional license
agreements we enter into pursuant to the library agreement is capped at (i) 933,337 shares of common stock in the event there is only one licensed product, and (ii)
1,333,338 shares of common stock in the event there are two or more licensed products, in each case to be issued based on our achievement of certain preclinical and
clinical development and sales milestone events.

APG1252 License Agreement

In  conjunction  with  the  library  agreement,  we  entered  into  our  first  license  agreement  with  Ascentage,  which  granted  us  the  right  to  develop  and
commercialize an Ascentage compound known as APG1252 on the template license terms described above, including up to $38.0 million of potential cash milestone
payments  and  low-single  digit  royalties.  Under  the  APG1252  license  agreement,  Ascentage  retained  the  right  to  manufacture  APG1252  compounds  for  use  in  our
licensed products. In connection with the APG1252 license agreement, we issued 533,335 shares of our common stock as an upfront license fee to Ascentage and the
University of Michigan, in the proportion described above. The APG1252 license agreement could be terminated by either party due to the other party’s uncured material
breach  of  the  APG1252  license  agreement,  and  we  could  terminate  for  convenience  on  a  licensed  product-by-licensed  product  basis.  On  July  30,  2020,  we  notified
Ascentage of our decision to terminate the APG1252 license agreement due to us prioritizing the progression of other compounds from the library agreement, such as
UBX1325.

Research Agreement

In conjunction with the library agreement we also entered into a research services agreement with Ascentage under which we provided $0.5 million per year
in funding to Ascentage for the further development of Bcl-2/xL inhibitor compounds, which we retain the right to access under the library agreement. The research
agreement  had  a  term  of  up  to  four  years  from  the  effective  date  of  February  2,  2016,  provided  that  the  research  agreement  may  have  been  terminated  by  us  for
convenience after the first year, by either party due to the other party’s uncured material breach, and by Ascentage if we failed to make the $0.5 million payment in any
given year.  On February 2, 2020, this agreement expired by its terms and was not renewed.

UBX1967 License Agreement

In January 2019, we entered into our second license agreement, or Bcl license agreement, with Ascentage granting rights to UBX1967 (which Ascentage calls
APG1197) on the template license terms described above, including up to $38.0 million of potential cash milestone payments and low-single digit royalties. Under the
terms of this license agreement, Ascentage has granted us exclusive development and commercialization rights and non-exclusive manufacturing rights to UBX1967 for
all non-oncology indications outside of Greater China. Inside

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Greater China, we will be obligated to develop, manufacture and commercialize UBX1967 through a joint venture with Ascentage. The Bcl license agreement also grants
us the right to continue our preclinical development efforts with another Ascentage-controlled Bcl-2/xL inhibitor compound.  In the event we wish to pursue clinical
development of the additional compound as well as UBX1967, we will be required to enter into a separate license agreement with Ascentage on the template license
terms described above. In connection with the Bcl license agreement, we issued 106,667 shares of common stock to Ascentage and 26,667 shares of common stock to the
University of Michigan as an upfront license fee in the first quarter of 2019. The Bcl license agreement may be terminated by either party due to an uncured material
breach of the agreement but the other party, and we may terminate for convenience on a licensed product-by-licensed product basis.  In November 2019, we entered into
an amendment to the Bcl license agreement that removed certain field and territory limitations from a provision granting us exclusivity and amended the schedule of
licensed patents to include certain additional patents relating to UBX1967. In January 2020, we entered into a second amendment to the Bcl license agreement which
further amended and restated the schedule of licensed patents. In June 2020, we entered into a third amendment to the Bcl license agreement. Under the terms of the
original Bcl license agreement, Ascentage granted us exclusive development and commercialization rights and non-exclusive manufacturing rights to UBX1967 as well
as the right to continue our preclinical development efforts with another Ascentage-controlled Bcl inhibitor compound, known as UBX1325, that served as a back-up
compound to UBX1967. Under the terms of the third amendment to the Bcl license agreement, the status of UBX1967 and UBX1325 were switched such that UBX1325
became the licensed compound and UBX1967 became the back-up compound under the Bcl license agreement. As a result of the first patient dosed in the UBX1325
study in the fourth quarter of 2020, we triggered, under  the  Bcl  license  agreement, a  milestone  payment  of  $1.0 million, which we  elected  to  settle  in  shares  of  our
common stock to Ascentage Pharma.

Additional License Agreements

We  are  party  to  three  additional  license  agreements  that  support  our  senescence-related  patent  portfolio.  These  agreements  are  with  The  John  Hopkins
University,  or  JHU,  an  entity  affiliated  with  the  Mayo  Clinic,  or  Mayo,  and  the  Buck  Institute  for  Research  on  Aging,  or  Buck,  and  provide  us  with  a  worldwide,
exclusive,  sublicensable  license  under  those  counter-parties’  rights  to  a  patent  family  that  is  co-owned  by  JHU,  Buck,  Mayo  and  us  to  develop  and  commercialize
licensed products, including for the treatment of senescence-related diseases in therapeutic areas including osteoarthritis, ophthalmology, and neurological diseases.

Under our June 2013 license with Mayo, we may be obligated to make development and sales milestone payments to Mayo of up to $10.8 million in the
aggregate, to pay Mayo a percentage of certain sublicensing revenue that is between the high-single digits and the low-teens, and to pay Mayo running royalty payments
ranging from less than 1% to low-single digit percentages on net sales of licensed products. Our obligation to pay running royalties to Mayo under the agreement is
subject to a non-material minimum annual royalty and could potentially extend until January 1, 2037. We also issued 677,966 shares of our common stock to Mayo under
this agreement. Our agreement with Mayo continues until the later of (i) the expiration of the last valid claim within the licensed patents and (ii) 13 years after first
commercial  sale  of  the  first  licensed  product.  We  may  terminate  the  agreement  for  convenience,  and  either  party  may  terminate  the  agreement  for  the  other  party’s
uncured material breach.

Under  our  January  2017  license  with  Buck,  which  includes  similar  rights  to  a  second  patent  family  that  is  co-owned  only  by  Buck  and  us,  we  may  be
obligated  to  make  development  and  sales  milestone  payments  to  Buck  of  up  to  $5.4  million  in  the  aggregate,  to  pay  Buck  a  mid-single  digit  percentage  of  certain
sublicensing  revenue,  and  to  pay  Buck  running  royalty  payments  ranging  from  less  than  1%  to  low-single  digit  percentages  on  net  sales  of  licensed  products.  Our
obligation to pay running royalties to Buck under the agreement is subject to a non-material minimum annual royalty and could potentially extend until January 1, 2037.
We also issued 132,203 shares of our common stock to Buck under this agreement. The term of our license agreement with Buck continues until the expiration of all our
payment obligations to Buck thereunder. We may terminate the agreement for convenience, and either party may terminate the agreement for the other party’s uncured
material breach.

Under  our  November  2016  license  with  JHU,  which  relates  to  patents  that  are  relevant  only  to  osteoarthritis  indications,  we  may  be  obligated  to  make
development and sales milestone payments to JHU in the form of equity (22,033 shares of our common stock) and cash (of up to $2.6 million in the aggregate), to pay
JHU a low-single digit percentage of certain sublicensing revenue, and to pay JHU a running royalty payment of less than 1% on net sales,

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in all cases, with respect to licensed products for the treatment of osteoarthritis, which we refer to as Royalty Products. Our obligation to pay running royalties to JHU
under the agreement is subject to a non-material minimum annual royalty, and may continue on a country-by-country basis until such time as neither the manufacture,
sale, nor use of such Royalty Product would infringe a valid claim of a licensed patent in the applicable country. Our agreement with JHU continues on a country-by-
country basis until the expiration of the last to expire licensed patent in such country (or until twenty years after the effective date if no licensed patent issues in such
country). We may terminate the agreement for convenience (as a whole, with respect to a licensed product, or with respect to a particular licensed patent). Either party
may terminate the agreement for the other party’s uncured material breach or bankruptcy or insolvency-related events.

Government Regulation

Government authorities in the United States (including federal, state and local authorities) and in other countries, extensively regulate, among other things, the
manufacturing,  research  and  clinical  development,  marketing,  labeling  and  packaging,  storage,  distribution,  post-approval  monitoring  and  reporting,  advertising  and
promotion,  pricing,  and  export  and  import  of  pharmaceutical  products,  such  as  those  we  are  developing.  The  process  of  obtaining  regulatory  approvals  and  the
subsequent compliance with appropriate federal, state, local and foreign statutes and regulations require the expenditure of substantial time and financial resources.

U.S. Government Regulation

In the United States, the FDA regulates drugs under the Federal Food, Drug, and Cosmetic Act, or FDCA, and its implementing regulations, and biologics
under the FDCA and the Public Health Service Act, or PHSA, and its implementing regulations. FDA approval is required before any new unapproved drug or dosage
form, including a new use of a previously approved drug, can be marketed in the United States. Drugs and biologics are also subject to other federal, state and local
statutes and regulations. If we fail to comply with applicable FDA or other requirements at any time during the drug development process, clinical testing, the approval
process  or  after  approval,  we  may  become  subject  to  administrative  or  judicial  sanctions.  These  sanctions  could  include  the  FDA’s  refusal  to  approve  pending
applications, license suspension or revocation, withdrawal of an approval, warning letters, product recalls, product seizures, total or partial suspension of production or
distribution, injunctions, fines, civil penalties or criminal prosecution.

The process required by the FDA before drug candidates may be marketed in the United States generally involves the following:

completion of extensive preclinical laboratory tests and preclinical animal studies, all performed in accordance with GLP regulations;

submission to the FDA of an IND, which must become effective before human clinical studies may begin;

approval by an independent institutional review board, or IRB, or ethics committee representing each clinical site before each clinical study may be initiated;

performance of adequate and well-controlled human clinical studies to establish the safety and efficacy, or in the case of a biologic, the safety, purity and
potency, of the drug candidate for each proposed indication;

preparation of and submission to the FDA of a new drug application, or NDA, or biologics license application, or BLA, after completion of all pivotal clinical
studies;

review of the product application by an FDA advisory committee, where appropriate and if applicable;

a determination by the FDA within 60 days of its receipt of an NDA or BLA to file the application for review;  

satisfactory completion of an FDA pre-approval inspection of the manufacturing facilities where the drug candidate is produced to assess compliance with
current Good Manufacturing Practices, or cGMP; and

FDA review and approval of an NDA or BLA prior to any commercial marketing or sale of the drug or biologic in the United States.

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An IND is a request for authorization from the FDA to administer an investigational new drug product to humans. The central focus of an IND submission is
on  the  general  investigational  plan  and  the  protocol(s)  for  human  studies.  The  IND  also  includes  results  of  animal  and  in  vitro  studies  assessing  the  toxicology,
pharmacokinetics, pharmacology and pharmacodynamic characteristics of the product; chemistry, manufacturing and controls information; and any available human data
or literature to support the use of the investigational new drug. An IND must become effective before human clinical studies may begin. An IND will automatically
become effective 30 days after receipt by the FDA, unless before that time the FDA raises concerns or questions related to the proposed clinical studies. In such a case,
the  IND  may  be  placed  on  clinical  hold  and  the  IND  sponsor  and  the  FDA  must  resolve  any  outstanding  concerns  or  questions  before  clinical  studies  can  begin.
Accordingly, submission of an IND may or may not result in the FDA allowing clinical studies to commence.

Clinical Studies

Clinical studies involve the administration of the investigational new drug to human subjects under the supervision of qualified investigators in accordance
with Good Clinical Practice regulations, or GCPs, which include the requirement that all research subjects provide their informed consent for their participation in any
clinical study. Clinical studies are conducted under protocols detailing, among other things, the objectives of the study, the parameters to be used in monitoring safety and
the  efficacy  criteria  to  be  evaluated.  A  protocol  for  each  clinical  study  and  any  subsequent  protocol  amendments  must  be  submitted  to  the  FDA  as  part  of  the  IND.
Additionally, approval must also be obtained from each clinical study site’s IRB before the studies may be initiated, and the IRB must monitor the study until completed.
There are also requirements governing the reporting of ongoing clinical studies and clinical study results to public registries.

The clinical investigation of a drug or biologic is generally divided into three or four phases. Although the phases are usually conducted sequentially, they

may overlap or be combined.

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Phase 1.The drug or biologic is initially introduced into healthy human subjects or patients with the target disease or condition. These studies are designed to
evaluate  the  safety,  dosage  tolerance,  metabolism  and  pharmacologic  actions  of  the  investigational  new  drug  in  humans,  the  side  effects  associated  with
increasing doses, and if possible, to gain early evidence on effectiveness.

Phase 2.The drug or biologic is administered to a limited patient population to evaluate dosage tolerance and optimal dosage, identify possible adverse side
effects and safety risks and preliminarily evaluate efficacy.

Phase 3.The drug or biologic is administered to an expanded patient population, generally at geographically dispersed clinical study sites to generate enough
data  to  statistically  evaluate  dosage,  clinical  effectiveness  and  safety,  to  establish  the  overall  benefit-risk  relationship  of  the  investigational  product  and  to
provide an adequate basis for product approval.

Phase 4.In some cases, the FDA may condition approval of an NDA or BLA for a drug candidate on the sponsor’s agreement to conduct additional clinical
studies after approval. In other cases, a sponsor may voluntarily conduct additional clinical studies after approval to gain more information about the drug.
Such post-approval studies are typically referred to as Phase 4 clinical studies.

A pivotal study is a clinical study that adequately meets regulatory agency requirements for the evaluation of a drug candidate’s efficacy and safety such that
it can be used to justify the approval of the product. Generally, pivotal studies are Phase 3 studies, but the FDA may accept results from Phase 2 studies if the study
design  provides  a  well-controlled  and  reliable  assessment  of  clinical  benefit,  particularly  in  situations  where  there  is  an  unmet  medical  need  and  the  results  are
sufficiently robust.

The FDA, the IRB or the clinical study sponsor may suspend or terminate a clinical study at any time on various grounds, including a finding that the research
subjects are being exposed to an unacceptable health risk. Additionally, some clinical studies are overseen by an independent group of qualified experts organized by the
clinical  study  sponsor,  known  as  a  data  safety  monitoring  board  or  committee.  This  group  provides  authorization  for  whether  or  not  a  study  may  move  forward  at
designated check points based on access to certain data from the study.

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A sponsor may also suspend or terminate a clinical study based on evolving business objectives and/or competitive climate.

Submission of an NDA or BLA to the FDA

Assuming successful completion of all required testing in accordance with all applicable regulatory requirements, detailed investigational new drug product
information  is  submitted  to  the  FDA  in  the  form  of  an  NDA  or  BLA  requesting  approval  to  market  the  product  for  one  or  more  indications.  Under  federal  law,  the
submission  of  most  NDAs  and  BLAs  is  subject  to  a  substantial  application  user  fee.  Applications  for  orphan  drug  products  are  exempted  from  the  NDA  and  BLA
application user fees.

An NDA or BLA must include all relevant data available from pertinent preclinical and clinical studies, including negative or ambiguous results as well as
positive findings, together with detailed information relating to the product’s chemistry, manufacturing, controls and proposed labeling, among other things. Data can
come from company-sponsored clinical studies intended to test the safety and effectiveness of a use of a product, or from a number of alternative sources, including
studies initiated by investigators. To support marketing approval, the data submitted must be sufficient in quality and quantity to establish the safety and effectiveness of
the investigational product to the satisfaction of the FDA.

Once an NDA or BLA has been submitted, the FDA’s goal is to review the application within ten months after it accepts the application for filing, or, if the
application receives priority review, six months after the FDA accepts the application for filing. The review process is often significantly extended by FDA requests for
additional information or clarification.

Before approving an NDA or BLA, the FDA typically will inspect the facility or facilities where the product is manufactured. The FDA will not approve an
application unless it determines that the manufacturing processes and facilities are in compliance with cGMP requirements and adequate to assure consistent production
of  the  product  within  required  specifications.  Additionally,  before  approving  an  NDA  or  BLA,  the  FDA  will  typically  inspect  one  or  more  clinical  sites  to  assure
compliance with GCP.

The FDA is required to refer an application for a novel drug or biologic to an advisory committee or explain why such referral was not made. An advisory
committee is a panel of independent experts, including clinicians and other scientific experts, that reviews, evaluates and provides a recommendation as to whether the
application  should  be  approved  and  under  what  conditions.  The  FDA  is  not  bound  by  the  recommendations  of  an  advisory  committee,  but  it  considers  such
recommendations carefully when making decisions and typically follows such recommendations.

The FDA’s Decision on an NDA or BLA

After the FDA evaluates the NDA or BLA and conducts inspections of manufacturing facilities, it may issue an approval letter or a Complete Response Letter.
An approval letter authorizes commercial marketing of the drug or biologic with specific prescribing information for specific indications. A Complete Response Letter
indicates that the review cycle of the application is complete and the application is not ready for approval. A Complete Response Letter may require additional clinical
data and/or an additional pivotal Phase 3 clinical study(ies), and/or other significant, expensive and time-consuming requirements related to clinical studies, preclinical
studies  or  manufacturing.  Even  if  such  additional  information  is  submitted,  the  FDA  may  ultimately  decide  that  the  NDA  or  BLA  does  not  satisfy  the  criteria  for
approval. The FDA could also approve the NDA or BLA with a Risk Evaluation and Mitigation Strategy, or REMS, to mitigate risks, which could include medication
guides, physician communication plans or elements to assure safe use, such as restricted distribution methods, patient registries and other risk minimization tools. The
FDA  also  may  condition  approval  on,  among  other  things,  changes  to  proposed  labeling,  development  of  adequate  controls  and  specifications  or  a  commitment  to
conduct one or more post-market studies or clinical studies. Such post-market testing may include Phase 4 clinical studies and surveillance to further assess and monitor
the product’s safety and effectiveness after commercialization. Also, new government

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requirements, including those resulting from new legislation, may be established, or the FDA’s policies may change, which could delay or prevent regulatory approval of
our products under development.

Expedited Review and Accelerated Approval Programs

The  FDA  has  various  programs,  including  fast  track  designation,  breakthrough  therapy  designation,  accelerated  approval,  and  priority  review,  that  are
intended to expedite the development and approval of new drugs and biologics that address unmet medical needs in the treatment of serious or life-threatening diseases
and conditions. To be eligible for a fast track designation, the FDA must determine, based on the request of a sponsor, that a product is intended to treat a serious or life-
threatening disease or condition and demonstrates the potential to address an unmet medical need. The FDA may review sections of the NDA for a fast-track product on
a rolling basis before the complete application is submitted, if the sponsor provides a schedule for the submission of the sections of the NDA, the FDA agrees to accept
sections of the NDA and determines that the schedule is acceptable, and the sponsor pays any required user fees upon submission of the first section of the NDA.

The  FDA  may  give  a  priority  review  designation  to  drugs  or  biologics  that  are  designed  to  treat  a  serious  condition  and,  if  approved,  would  provide  a
significant improvement in safety or effectiveness compared to available therapies. A priority review means that the goal for the FDA to review an application is six
months, rather than the standard review of ten months. These six- and 10-month review periods are measured from the “filing” date rather than the receipt date for NDAs
for new molecular entities, which typically adds approximately two months to the timeline for review and decision from the date of submission. Products that are eligible
for fast-track designation may also be eligible for priority review.

In addition, products studied for their safety and effectiveness in treating serious or life-threatening illnesses and that provide meaningful therapeutic benefit
over existing treatments may be eligible for accelerated approval and may be approved on the basis of adequate and well-controlled clinical studies establishing that the
product has an effect on a surrogate endpoint that is reasonably likely to predict clinical benefit, or on a clinical endpoint that can be measured earlier than irreversible
morbidity or mortality, that is reasonably likely to predict an effect on irreversible morbidity or mortality or other clinical benefit, taking into account the severity, rarity
or  prevalence  of  the  condition  and  the  availability  or  lack  of  alternative  treatments.  As  a  condition  of  approval,  the  FDA  may  require  a  sponsor  of  a  drug  receiving
accelerated approval to perform post-marketing studies to verify and describe the predicted effect on irreversible morbidity or mortality or other clinical endpoint, and the
drug or biologic may be subject to expedited withdrawal procedures if the sponsor fails to conduct the required post-marketing studies, or such post-marketing studies
fail to confirm the predicted clinical benefit.

Moreover,  under  the  provisions  of  the  Food  and  Drug  Administration  Safety  and  Innovation  Act,  or  FDASIA,  passed  in  July  2012,  a  sponsor  can  request
designation of a product candidate as a “breakthrough therapy.” A breakthrough therapy is defined as a drug or biologic that is intended, alone or in combination with
one  or  more  other  drugs  or  biologics,  to  treat  a  serious  or  life-threatening  disease  or  condition,  and  preliminary  clinical  evidence  indicates  that  the  product  may
demonstrate  substantial  improvement  over  existing  therapies  on  one  or  more  clinically  significant  endpoints,  such  as  substantial  treatment  effects  observed  early  in
clinical development. This designation includes all of the features of fast track designation, as well as more intensive FDA interaction and guidance. The breakthrough
therapy designation is a distinct status from both accelerated approval and priority review, but these can also be granted to the same product candidate if the relevant
criteria  are  met.  The  FDA  must  take  certain  actions,  such  as  holding  timely  meetings  and  providing  advice,  intended  to  expedite  the  development  and  review  of  an
application for approval of a breakthrough therapy.

Fast track designation, priority review, and breakthrough therapy designation do not change the standards for approval but may expedite the development or
approval  process.  Even  if  a  product  qualifies  for  one  or  more  of  these  programs,  the  FDA  may  later  decide  that  the  product  no  longer  meets  the  conditions  for
qualification or decide that the time period for FDA review or approval will not be shortened.

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Post-Approval Requirements

Drugs  and  biologics  marketed  pursuant  to  FDA  approvals  are  subject  to  pervasive  and  continuing  regulation  by  the  FDA,  including,  among  other  things,
requirements relating to recordkeeping, periodic reporting, product sampling and distribution, advertising and promotion and reporting of adverse experiences with the
product. After approval, most changes to the approved product, such as adding new indications or other labeling claims are subject to prior FDA review and approval.
There also are continuing, annual user fee requirements.

Manufacturers  are  subject  to  periodic  unannounced  inspections  by  the  FDA  and  state  agencies  for  compliance  with  cGMP  requirements.  Changes  to  the
manufacturing  process  are  strictly  regulated  and,  depending  on  the  significance  of  the  change,  may  require  prior  FDA  approval  before  being  implemented.  FDA
regulations also require investigation and correction of any deviations from cGMP and impose reporting and documentation requirements upon us and any third-party
manufacturers that we may decide to use. Accordingly, manufacturers must continue to expend time, money and effort in the area of production and quality control to
maintain compliance with cGMP and other aspects of regulatory compliance.

Discovery  of  previously  unknown  problems  with  a  product  or  the  failure  to  comply  with  applicable  requirements  may  result  in  restrictions  on  a  product,
manufacturer or holder of an approved NDA or BLA, including withdrawal or recall of the product from the market or other voluntary, FDA-initiated or judicial action
that could delay or prohibit further marketing. Also, new government requirements, including those resulting from new legislation, may be established, or the FDA’s
policies may change, which could delay or prevent regulatory approval of our products under development.

The FDA may withdraw approval if compliance with regulatory requirements and standards is not maintained or if problems occur after the product reaches
the  market.  Later  discovery  of  previously  unknown  problems  with  a  product,  including  adverse  events  of  unanticipated  severity  or  frequency,  or  with  manufacturing
processes, or failure to comply with regulatory requirements, may result in revisions to the approved labeling to add new safety information; imposition of post-market
studies or clinical studies to assess new safety risks; or imposition of distribution restrictions or other restrictions under a REMS program. Other potential consequences
include, among other things:

•

•

•

•

•

•

restrictions on the marketing or manufacturing of the product;  

complete withdrawal of the product from the market or product recalls;

fines, warning letters or holds on post-approval clinical studies;

refusal  of  the  FDA  to  approve  pending  NDAs  or  BLAs  or  supplements  to  approved  NDAs  or  BLAs,  or  suspension  or  revocation  of  product  licenses  or
approvals;

product seizure or detention, or refusal to permit the import or export of products; or

injunctions or the imposition of civil or criminal penalties.

The FDA strictly regulates marketing, labeling, advertising and promotion of products that are placed on the market. Drugs may be promoted only for the
approved indications and in accordance with the provisions of the approved label. The FDA and other agencies actively enforce the laws and regulations prohibiting the
promotion of off-label uses, and a company that is found to have improperly promoted off-label uses may be subject to significant liability.

Orphan Designation and Exclusivity

Under the Orphan Drug Act, the FDA may grant orphan designation to a drug or biologic intended to treat a rare disease or condition, defined as a disease or
condition with a patient population of fewer than 200,000 individuals in the United States, or a patient population greater than 200,000 individuals in the United States
and when there is no reasonable expectation that the cost of developing and making available the drug or biologic in the United States will be recovered from sales in the
United States for that drug or biologic. Orphan drug designation

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must be requested before submitting a BLA or NDA. After the FDA grants orphan drug designation, the generic identity of the therapeutic agent and its potential orphan
use are disclosed publicly by the FDA.

If a product that has orphan drug designation subsequently receives the first FDA approval for a particular active ingredient for the disease for which it has
such designation, the product is entitled to orphan product exclusivity, which means that the FDA may not approve any other applications, including a full NDA or BLA,
to market the same drug or biologic for the same indication for seven years, except in limited circumstances, such as a showing of clinical superiority to the product with
orphan drug exclusivity or if FDA finds that the holder of the orphan drug exclusivity has not shown that it can assure the availability of sufficient quantities of the
orphan drug to meet the needs of patients with the disease or condition for which the drug was designated. Orphan drug exclusivity does not prevent the FDA from
approving a different drug or biologic for the same disease or condition, or the same drug or biologic for a different disease or condition. Among the other benefits of
orphan drug designation are tax credits for certain research and a waiver of the BLA or NDA application user fee.

A designated orphan drug many not receive orphan drug exclusivity if it is approved for a use that is broader than the indication for which it received orphan
designation.  In  addition,  orphan  drug  exclusive  marketing  rights  in  the  United  States  may  be  lost  if  the  FDA  later  determines  that  the  request  for  designation  was
materially defective or, as noted above, if the second applicant demonstrates that its product is clinically superior to the approved product with orphan exclusivity or the
manufacturer of the approved product is unable to assure sufficient quantities of the product to meet the needs of patients with the rare disease or condition.

Biosimilars and Exclusivity

The Patient Protection and Affordable Care Act, as amended by the Health Care and Education Reconciliation Act, or the Affordable Care Act, signed into
law  in  2010,  includes  a  subtitle  called  the  Biologics  Price  Competition  and  Innovation  Act  of  2009,  or  BPCIA,  which  created  an  abbreviated  approval  pathway  for
biological products that are biosimilar to or interchangeable with an FDA-licensed reference biological product. To date, only a handful of biosimilars have been licensed
under the BPCIA, although numerous biosimilars have been approved in Europe. The FDA has issued several guidance documents outlining an approach to review and
approval of biosimilars.

Biosimilarity, which requires that there be no clinically meaningful differences between the biological product and the reference product in terms of safety,
purity and potency, can be shown through analytical studies, animal studies and a clinical study or studies. Interchangeability requires that a product is biosimilar to the
reference product and the product must demonstrate that it can be expected to produce the same clinical results as the reference product in any given patient and, for
products  that  are  administered  multiple  times  to  an  individual,  the  biologic  and  the  reference  biologic  may  be  alternated  or  switched  after  one  has  been  previously
administered without increasing safety risks or risks of diminished efficacy relative to exclusive use of the reference biologic. However, complexities associated with the
larger,  and  often  more  complex,  structures  of  biological  products,  as  well  as  the  processes  by  which  such  products  are  manufactured,  pose  significant  hurdles  to
implementation of the abbreviated approval pathway that are still being worked out by the FDA.

Under the BPCIA, an application for a biosimilar product may not be submitted to the FDA until four years following the date that the reference product was
first licensed by the FDA. In addition, the approval of a biosimilar product may not be made effective by the FDA until 12 years from the date on which the reference
product was first licensed. During this 12-year period of exclusivity, another company may still market a competing version of the reference product if the FDA approves
a full BLA for the competing product containing that applicant’s own preclinical data and data from adequate and well-controlled clinical studies to demonstrate the
safety, purity and potency of its product. The BPCIA also created certain exclusivity periods for biosimilars approved as interchangeable products. At this juncture, it is
unclear whether products deemed “interchangeable” by the FDA will, in fact, be readily substituted by pharmacies, which are governed by state pharmacy law.

A biological product can also obtain pediatric market exclusivity in the United States. Pediatric exclusivity, if granted, adds six months to existing exclusivity

periods and patent terms. This six-month exclusivity, which runs

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from the end of other exclusivity protection or patent term, may be granted based on the voluntary completion of a pediatric study in accordance with an FDA-issued
“Written Request” for such a study.

The BPCIA is complex and continues to be interpreted and implemented by the FDA. In addition, recent government proposals have sought to reduce the 12-
year reference product exclusivity period. Other aspects of the BPCIA, some of which may impact the BPCIA exclusivity provisions, have also been the subject of recent
litigation. As a result, the ultimate impact, implementation, and impact of the BPCIA is subject to significant uncertainty.

Hatch-Waxman Amendments and Exclusivity

Section 505 of the FDCA describes three types of marketing applications that may be submitted to the FDA to request marketing authorization for a new drug.
A Section 505(b)(1) NDA is an application that contains full reports of investigations of safety and efficacy. A 505(b)(2) NDA is an application that contains full reports
of investigations of safety and efficacy but where at least some of the information required for approval comes from investigations that were not conducted by or for the
applicant and for which the applicant has not obtained a right of reference or use from the person by or for whom the investigations were conducted. This regulatory
pathway  enables  the  applicant  to  rely,  in  part,  on  the  FDA’s  prior  findings  of  safety  and  efficacy  for  an  existing  product,  or  published  literature,  in  support  of  its
application. Section 505(j) establishes an abbreviated approval process for a generic version of approved drug products through the submission of an Abbreviated New
Drug  Application,  or  ANDA.  An  ANDA  provides  for  marketing  of  a  generic  drug  product  that  has  the  same  active  ingredients,  dosage  form,  strength,  route  of
administration, labeling, performance characteristics and intended use, among other things, to a previously approved product. ANDAs are termed “abbreviated” because
they are generally not required to include preclinical (animal) and clinical (human) data to establish safety and efficacy. Instead, generic applicants must scientifically
demonstrate that their product is bioequivalent to, or performs in the same manner as, the innovator drug through in vitro, in vivo or other testing. The generic version
must  deliver  the  same  amount  of  active  ingredients  into  a  subject’s  bloodstream  in  the  same  amount  of  time  as  the  innovator  drug  and  can  often  be  substituted  by
pharmacists under prescriptions written for the reference listed drug. In seeking approval for a drug through an NDA, applicants are required to list with the FDA each
patent with claims that cover the applicant’s drug or a method of using the drug. Upon approval of a drug, each of the patents listed in the application for the drug is then
published in the FDA’s Approved Drug Products with Therapeutic Equivalence Evaluations, commonly known as the Orange Book. Drugs listed in the Orange Book
can, in turn, be cited by potential competitors in support of approval of an ANDA or 505(b)(2) NDA.

Upon submission of an ANDA or a 505(b)(2) NDA, an applicant must certify to the FDA that (1) no patent information on the drug product that is the subject
of the application has been submitted to the FDA; (2) such patent has expired; (3) the date on which such patent expires; or (4) such patent is invalid or will not be
infringed upon by the manufacture, use or sale of the drug product for which the application is submitted. Generally, the ANDA or 505(b)(2) NDA cannot be approved
until all listed patents have expired, except where the ANDA or 505(b)(2) NDA applicant challenges a listed patent through the last type of certification, also known as a
paragraph IV certification. If the applicant does not challenge the listed patents, or indicates that it is not seeking approval of a patented method of use, the ANDA or
505(b)(2) NDA application will not be approved until all of the listed patents claiming the referenced product have expired.

If  the  ANDA  or  505(b)(2)  NDA  applicant  has  provided  a  Paragraph  IV  certification  to  the  FDA,  the  applicant  must  send  notice  of  the  Paragraph  IV
certification  to  the  NDA  and  patent  holders  once  the  application  has  been  accepted  for  filing  by  the  FDA.  The  NDA  and  patent  holders  may  then  initiate  a  patent
infringement lawsuit in response to the notice of the paragraph IV certification. If the paragraph IV certification is challenged by an NDA holder or the patent owner(s)
asserts a patent challenge to the paragraph IV certification, the FDA may not approve that application until the earlier of 30 months from the receipt of the notice of the
paragraph IV certification, the expiration of the patent, when the infringement case concerning each such patent was favorably decided in the applicant’s favor or settled,
or such shorter or longer period as may be ordered by a court. This prohibition is generally referred to as the 30-month stay. In instances where an ANDA or 505(b)(2)
NDA applicant files a paragraph IV certification, the NDA holder or patent owner(s) regularly take action to trigger the 30-month stay, recognizing that the related patent
litigation may take many months or years to resolve.

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The  FDA  also  cannot  approve  an  ANDA  or  505(b)(2)  application  until  all  applicable  non-patent  exclusivities  listed  in  the  Orange  Book  for  the  branded
reference drug have expired. For example, a pharmaceutical manufacturer may obtain five years of non-patent exclusivity upon NDA approval of a new chemical entity,
or NCE, which is a drug containing an active moiety that has not been approved by FDA in any other NDA. An “active moiety” is defined as the molecule responsible
for the drug substance’s physiological or pharmacologic action. During that five-year exclusivity period, the FDA cannot accept for filing (and therefore cannot approve)
any ANDA seeking approval of a generic version of that drug or any 505(b)(2) NDA that relies on the FDA’s approval of the drug, provided that that the FDA may
accept an ANDA four years into the NCE exclusivity period if the ANDA applicant also files a Paragraph IV certification.

A drug, including one approved under Section 505(b)(2), may obtain a three-year period of exclusivity for a particular condition of approval, or change to a
marketed product, such as a new formulation for a previously approved product, if one or more new clinical studies (other than bioavailability or bioequivalence studies)
was  essential  to  the  approval  of  the  application  and  was  conducted/sponsored  by  the  applicant.  Should  this  occur,  the  FDA  would  be  precluded  from  approving  any
ANDA  or  505(b)(2)  application  for  the  protected  modification  until  after  that  three-year  exclusivity  period  has  run.  However,  unlike  NCE  exclusivity,  the  FDA  can
accept an application and begin the review process during the exclusivity period.

Other Healthcare Laws and Compliance Requirements

Pharmaceutical  companies  are  subject  to  additional  healthcare  regulation  and  enforcement  by  the  federal  government  and  by  authorities  in  the  states  and
foreign  jurisdictions  in  which  they  conduct  their  business.  Such  laws  include,  without  limitation,  state  and  federal  anti-kickback,  fraud  and  abuse,  false  claims,  and
physician sunshine laws and regulations. If their operations are found to be in violation of any of such laws or any other governmental regulations that apply, they may be
subject to penalties, including, without limitation, civil and criminal penalties, damages, fines, the curtailment or restructuring of operations, exclusion from participation
in federal and state healthcare programs and individual imprisonment.

Coverage and Reimbursement

Sales of any product depend, in part, on the extent to which such product will be covered by third-party payors, such as federal, state and foreign government
healthcare  programs,  commercial  insurance  and  managed  healthcare  organizations  and  the  level  of  reimbursement  for  such  product  by  third-party  payors.  Decisions
regarding  the  extent  of  coverage  and  amount  of  reimbursement  to  be  provided  are  made  on  a  plan-by-plan  basis.  These  third-party  payors  are  increasingly  reducing
reimbursements  for  medical  products,  drugs  and  services.  For  products  administered  under  the  supervision  of  a  physician,  obtaining  coverage  and  adequate
reimbursement may be particularly difficult because of the higher prices often associated with such drugs. In addition, the U.S. government, state legislatures and foreign
governments  have  continued  implementing  cost-containment  programs,  including  price  controls,  restrictions  on  coverage  and  reimbursement  and  requirements  for
substitution  of  generic  products.  Adoption  of  price  controls  and  cost-containment  measures,  and  adoption  of  more  restrictive  policies  in  jurisdictions  with  existing
controls and measures, could further limit sales of any product. Decreases in third-party reimbursement for any product or a decision by a third-party payor not to cover a
product could reduce physician usage and patient demand for the product and also have a material adverse effect on sales.

Healthcare Reform

In March 2010, former President Obama signed the Affordable Care Act, which substantially changed the way healthcare is financed by both governmental
and private insurers in the United States, and significantly affected the pharmaceutical industry. The Affordable Care Act contains a number of provisions, including
those governing enrollment in federal healthcare programs, reimbursement adjustments and fraud and abuse changes. Additionally, the Affordable Care Act increases the
minimum  level  of  Medicaid  rebates  payable  by  manufacturers  of  brand  name  drugs  from  15.1%  to  23.1%;  requires  collection  of  rebates  for  drugs  paid  by  Medicaid
managed care organizations; requires manufacturers to participate in a coverage gap discount program, under which they must agree to offer 70 percent point-of-sale
discounts off negotiated prices of applicable brand drugs to eligible beneficiaries during

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their  coverage  gap  period,  as  a  condition  for  the  manufacturer’s  outpatient  drugs  to  be  covered  under  Medicare  Part  D;  and  imposes  a  non-deductible  annual  fee  on
pharmaceutical manufacturers or importers who sell “branded prescription drugs” to specified federal government programs.

Since  its  enactment,  there  have  been  judicial  and  Congressional  challenges  to  certain  aspects  of  the  Affordable  Care  Act,  and  we  expect  there  will  be
additional challenges and other efforts to repeal or replace the Affordable Care Act in the future. Other legislative changes have been proposed and adopted since the
Affordable Care Act was enacted, including aggregate reductions of Medicare payments to providers of 2% per fiscal year and reduced payments to several types of
Medicare providers. Moreover, there has recently been heightened governmental scrutiny over the manner in which manufacturers set prices for their marketed products,
which  has  resulted  in  several  Congressional  inquiries  and  proposed  bills  designed  to,  among  other  things,  bring  more  transparency  to  product  pricing,  review  the
relationship between pricing and manufacturer patient programs, and reform government program reimbursement methodologies for drug products. Individual states in
the  United  States  have  also  become  increasingly  active  in  implementing  regulations  designed  to  control  pharmaceutical  product  pricing,  including  price  or  patient
reimbursement constraints, discounts, restrictions on certain product access and marketing cost disclosure and transparency measures, and, in some cases, designed to
encourage importation from other countries and bulk purchasing.

Privacy and Security Laws

Numerous  state,  federal  and  foreign  laws,  including  consumer  protection  laws  and  regulations,  govern  the  collection,  dissemination,  use,  access  to,
confidentiality  and  security  of  personal  information,  including  health-related  information.  In  the  United  States,  numerous  federal  and  state  laws  and  regulations,
including data breach notification laws, health information privacy and security laws, including the federal Health Insurance Portability and Accountability Act of 1996,
or HIPAA, and federal and state consumer protection laws and regulations (e.g., Section 5 of the FTC Act), that govern the collection, use, disclosure, and protection of
health-related and other personal information could apply to our operations or the operations of our partners. In addition, certain state and non-U.S. laws, such as the
California Consumer Privacy Act, or the CCPA, the California Privacy Rights Act, or the CPRA, and the General Data Protection Regulation, or the GDPR, govern the
privacy and security of personal data, including health-related data in certain circumstances, some of which are more stringent than HIPAA and many of which differ
from each other in significant ways and may not have the same effect, thus complicating compliance efforts. Failure to comply with these laws, where applicable, can
result in the imposition of significant civil and/or criminal penalties and private litigation.  Privacy and security laws, regulations, and other obligations are constantly
evolving,  may  conflict  with  each  other  to  complicate  compliance  efforts,  and  can  result  in  investigations,  proceedings,  or  actions  that  lead  to  significant  civil  and/or
criminal penalties and restrictions on data processing.

Employees and Human Capital Resources

As of December 31, 2020, we had 61 employees, all of whom were full-time. Approximately 36% of our employees hold advanced degrees. The majority of
our employees work in our corporate headquarters. None of our employees are represented by a labor union or a collective bargaining agreement and we consider our
relationship with our employees to be good.

Our  human  capital  resources  objectives  are,  as  applicable,  identifying,  recruiting,  retaining,  incentivizing  and  integrating  our  existing  and  additional
employees. As such, we expend considerable time, attention, and financial resources on these activities. Our corporate culture, which is underpinned by our company
values,  is  the  overarching  framework  we  use  to  make  decisions  related  to  people  practices,  including  total  compensation,  short  and  long-term  incentives,  health  and
wellness, and employee engagement.

Our corporate headquarters are located in South San Francisco, California, where we currently lease approximately 62,000 square feet of office and laboratory

space pursuant to a lease dated February 28, 2019.  Substantially all our employees work at our corporate headquarters.

Facilities

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Legal Proceedings

We  are  not  currently  involved  in  any  litigation  or  legal  proceedings  that,  in  management’s  opinion,  are  likely  to  have  any  material  adverse  effect  on  our
company.  While  we  know  of  no  imminent  legal  action  in  which  we  are  likely  to  be  involved,  we  may  in  the  future  become  engaged  in  litigation  or  other  legal
proceedings.  Regardless  of  the  outcome,  litigation  can  have  an  adverse  impact  due  to  defense  fees,  settlement  costs,  demands  on  management  attention,  and  other
concerns.

We view our operations and manage our business as one reportable segment. See Note 1 in the Notes to Financial Statements included in this Annual Report

on Form 10-K. Additional information required by this item is incorporated herein by reference to Part II, Item 6, “Selected Financial Data.”

Financial Information About Segments

About UNITY

We were incorporated in the State of Delaware on March 30, 2009. Our registered trademarks include UNITY BIOTECHNOLOGY®. Other service marks,

trademarks and trade names referred to in this document are the property of their respective owners.

Available Information

We are subject to the information requirements of the Securities Exchange Act of 1934, as amended and we therefore file periodic reports, proxy statements
and other information with the U.S. Securities and Exchange Commission, or SEC, relating to our business, financial statements and other matters. The SEC maintains
an Internet site, www.sec.gov, that contains reports, proxy statements and other information regarding issuers such as UNITY.

For more information about UNITY, including free access to our annual reports on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K
and amendments to those reports, visit our website, www.unitybiotechnology.com. The information found on or accessible through our website is not incorporated into,
and does not form a part of, this Annual Report on Form 10-K.

35

 
Item 1A. Risk Factors

Risk Factor Summary

Below is a summary of the principal factors that make an investment in our common stock speculative or risky. This summary does not address all of the risks that we
face. Additional discussion of the risks summarized in this risk factor summary, and other risks that we face, can be found below under the heading “Risk Factors” and
should be carefully considered, together with other information in this Annual Report on Form 10-K and our other filings with the Securities and Exchange Commission,
or SEC, before making investment decisions regarding our common stock.

•

•

•

•

•

•

•

•

•

We  are  a  clinical-stage  biopharmaceutical  company  with  a  limited  operating  history  and  no  products  approved  for  commercial  sale.  We  have  incurred
significant losses since our inception, and we anticipate that we will continue to incur losses for the foreseeable future, which, together with our limited
operating history, make it difficult to assess our future viability.

We will require substantial additional financing to achieve our goals, and a failure to obtain this capital when needed on acceptable terms, or at all, could
force us to delay, limit, reduce or terminate our product development, other operations or commercialization efforts.

Our core therapeutic approach to slow, halt, or reverse diseases of aging is based on our understanding of cellular senescence. Utilizing senolytic molecules
to treat diseases of aging is a novel therapeutic approach, which exposes us to unforeseen risks and makes it difficult to predict the time and cost of drug
development and potential for regulatory approval.

Our  business  is  dependent  on  the  successful  development,  regulatory  approval,  and  commercialization  of  our  drug  candidates,  all  of  which  are  in  early
stages of development and none of which have shown definitive efficacy in human subject.

The COVID-19 pandemic could adversely impact our business, including our clinical trials, and financial condition.

Even if our current drug candidates or any future drug candidates obtain regulatory approval, they may fail to achieve the broad degree of physician and
patient adoption and use necessary for commercial success.

We rely on third-party suppliers to manufacture preclinical and clinical supplies of our drug candidates and we intend to continue to rely on third parties to
produce such preclinical and clinical supplies as well as commercial supplies of any approved product. The loss of these suppliers, or their failure to comply
with  applicable  regulatory  requirements  or  to  provide  us  with  sufficient  quantities  at  acceptable  quality  levels  or  prices,  or  at  all,  would  materially  and
adversely affect our business.

We face significant competition in an environment of rapid technological and scientific change, and our drug candidates, if approved, will face significant
competition and our failure to effectively compete may prevent us from achieving significant market penetration. Most of our competitors have significantly
greater resources than we do, and we may not be able to successfully compete.

Our senolytic medicine platform and any future products that we commercialize could be alleged to infringe patent rights and other proprietary rights of
third  parties,  which  may  require  costly  litigation  and,  if  we  are  not  successful,  could  cause  us  to  pay  substantial  damages  and/or  limit  our  ability  to
commercialize our products. Even if we obtain regulatory approval for a drug candidate, our products will remain subject to regulatory scrutiny.

36

 
 
 
 
 
 
 
 
 
 
Risk Factors

This Annual Report on Form 10-K contains forward-looking information based on our current expectations. Because our business is subject to many risks and our actual
results may differ materially from any forward-looking statements made by or on behalf of us, this section includes a discussion of important factors that could affect our
business, operating results, financial condition and the trading price of our common stock. Many of the following risks and uncertainties are, and will be, exacerbated by
the COVID-19 pandemic and any worsening of the global business and economic environment as a result. This discussion should be read in conjunction with the other
information  in  this  Annual  Report  on  Form  10-K,  including  our  financial  statements  and  the  notes  accompanying  those  financial  statements  and  “Management’s
Discussion and Analysis of Financial Condition and Results of Operations.” The occurrence of any of the events or developments described below could have a material
adverse effect on our business, results of operations, financial condition, prospects and stock price. Additional risks and uncertainties not presently known to us or that
we currently deem immaterial may also impair our business.

Risks Related to Our Limited Operating History, Financial Condition, and Capital Requirements

We are a clinical-stage biopharmaceutical company with a limited operating history and no products approved for commercial sale. We have incurred significant
losses since our inception, and we anticipate that we will continue to incur losses for the foreseeable future, which, together with our limited operating history, make
it difficult to assess our future viability.

We are a clinical-stage biopharmaceutical company with a limited operating history. Biopharmaceutical product development is a highly speculative undertaking and
involves a substantial degree of risk. We have not yet sought approval for commercial sale of any products and therefore have no products approved for commercial sale
and have not generated any revenue from contracts with customers and have incurred losses in each year since our inception
in March 2009. We have only a limited operating history upon which you can evaluate our business and prospects. In addition, we have limited experience and have not
yet  demonstrated  an  ability  to  successfully  overcome  many  of  the  risks  and  uncertainties  frequently  encountered  by  companies  in  new  and  rapidly  evolving  fields,
particularly in the biopharmaceutical industry. We completed a Phase 1 and Phase 2 clinical study of UBX0101, a senolytic small
molecule  inhibitor  of  the  MDM2/p53  protein-protein  interaction,  in  patients  with  osteoarthritis,  or  OA.  In  August  2020,  we  announced  the  12-week  results  from  our
Phase 2 study of UBX0101 in patients with moderate-to-severe painful OA of the knee. There was no statistically significant difference between any arm of UBX0101
and  placebo  at  the  12-week  primary  endpoint  for  change  from  baseline  in  WOMAC-A,  an  established  measurement  of  pain  in  OA.  Given  these  results,  we  are  not
progressing UBX0101 into pivotal studies and have narrowed our near-term focus to our ongoing ophthalmologic and neurologic disease programs. In the third quarter
of 2020, we initiated a Phase 1 study of UBX1325 in patients with diabetic macular edema, or DME, or age-related macular degeneration, or AMD, and expect to obtain
initial safety and tolerability results from this study in the first half of 2021.

We have had significant operating losses since our inception. Our net loss for the years ended December 31, 2020 and 2019 was approximately $93.8 million and $82.2
million, respectively. As of December 31, 2020, we had an accumulated deficit of $339.3 million. Substantially all of our losses have resulted from expenses incurred in
connection with our research and development programs and from general and administrative costs associated with
our  operations.  We  expect  to  continue  to  incur  losses  for  the  foreseeable  future,  and  we  anticipate  these  losses  will  increase  as  we  continue  to  develop  our  drug
candidates,  conduct  clinical  studies  and  pursue  research  and  development  activities.  Even  if  we  achieve  profitability  in  the  future,  we  may  not  be  able  to  sustain
profitability in subsequent periods. Our prior losses, combined with expected future losses, have had and will continue to have an adverse effect on our stockholders’
equity and working capital.

We will require substantial additional financing to achieve our goals, and a failure to obtain this capital when needed on acceptable terms, or at all, could force us to
delay, limit, reduce or terminate our product development, other operations or commercialization efforts.

Since our inception, we have invested a significant portion of our efforts and financial resources in research and development activities. Preclinical studies and clinical
studies  for  our  drug  candidates  and  additional  research  and  development  activities  to  discover  and  develop  new  drug  candidates  will  require  substantial  funds  to
complete. As of

37

 
 
 
 
 
 
 
December 31,  2020,  we  had  capital  resources  consisting  of  cash,  cash  equivalents,  and  marketable  securities  of  $115.6 million.  We  believe  that  we  will continue  to
expend substantial resources for the foreseeable future in connection with the preclinical and clinical development of our drug candidates, including UBX1325, and the
discovery  and/or  development  of  any  other  drug  candidates  we  may  choose  to  pursue.  These  expenditures  will  include  costs  associated  with  conducting  preclinical
studies and clinical studies, obtaining regulatory approvals, and manufacturing and supply, as well as marketing and selling any products approved for sale. In addition,
other unanticipated costs may arise. Because the outcome of any preclinical study or clinical study is highly uncertain, we
cannot reasonably estimate the actual amounts necessary to successfully complete the development and commercialization of our current drug candidates or any future
drug candidates.

We believe that our existing cash, cash equivalents and marketable securities will be sufficient to enable us to fund our projected operations through at least the next 12
months. However, our operating plans may change as a result of many factors currently unknown to us, and we may need to seek additional funds sooner than planned,
through public or private equity or debt financings or other sources, such as strategic collaborations. Such financing may result in dilution to stockholders, the imposition
of burdensome debt covenants and repayment obligations, or other restrictions that may affect our business. Adequate funding may not be available to us on acceptable
terms, or at all, particularly in light of the current COVID-19 pandemic and associated economic uncertainty and potential for local and/or global economic recession. In
addition, we may seek additional capital due to favorable market conditions or strategic considerations even if we believe we have sufficient funds for our current or
future operating plans.

Our future capital requirements depend on many factors, including:

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the scope, progress, results and costs of researching and developing our drug candidates, and conducting preclinical studies and clinical studies, including our
ongoing Phase 1 safety and tolerability study of UBX1325, which we recently initiated, and our additional planned clinical studies in our ophthalmology
program;

the timing of, and the costs involved in, obtaining regulatory approvals for our current drug candidates or any future drug candidates;

potential delays in or an increase in costs associated with our ongoing or planned preclinical studies or clinical trials as a result of the COVID-19 pandemic;

the number and characteristics of any additional drug candidates we develop or acquire;

the timing and amount of any milestone payments we are required to make pursuant to our license agreements;

the cost of manufacturing our current drug candidates or any future drug candidates and any products we successfully commercialize;

the expenses needed to attract, hire and retain skilled personnel;

the cost of building a sales force and related functions in anticipation of product commercialization;

the cost of commercialization activities if our current drug candidates or any future drug candidates are approved for sale, including marketing, sales and
distribution costs;

our ability to maintain existing, and establish new, strategic collaborations, licensing or other arrangements and the financial terms of any such agreements,
including the timing and amount of any future milestone, royalty or other payments due under any such agreement;

any product liability or other lawsuits related to our products;

the costs associated with being a public company;

38

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
•

•

the costs involved in preparing, filing, prosecuting, maintaining, defending and enforcing our intellectual property portfolio; and

the timing, receipt and amount of sales of any future approved products, if any.

Additional funds may not be available when we need them, on terms that are acceptable to us, or at all. If adequate funds are not available to us on a timely basis, we
may be required to:

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delay,  limit,  reduce  or  terminate  preclinical  studies,  clinical  studies  or  other  development  activities  for  our  current  drug  candidates  or  any  future  drug
candidate;

delay, limit, reduce or terminate our research and development activities; or

delay,  limit,  reduce  or  terminate  our  efforts  to  establish  manufacturing  and  sales  and  marketing  capabilities  or  other  activities  that  may  be  necessary  to
commercialize  our  current  drug  candidates  or  any  future  drug  candidate,  or  reduce  our  flexibility  in  developing  or  maintaining  our  sales  and  marketing
strategy.

We also could choose or be required to seek funds through arrangements with collaborators or others that may require us to relinquish rights to some of our technologies
or drug candidates that we would otherwise pursue on our own. We do not expect to realize revenue from sales of products or royalties from licensed products in the
foreseeable future, if at all, and unless and until our drug candidates are clinically tested, approved for commercialization and successfully marketed. To date, we have
primarily financed our operations through the sale of equity securities. We will be required to seek additional funding in the future and currently intend to do so through
collaborations, public or private equity offerings or debt financings, credit or loan facilities or a combination of one or more of these funding sources. Our ability to raise
additional  funds  will  depend  on  financial,  economic  and  other  factors,  many  of  which  are  beyond  our  control.  For  example,  financial  markets  have  been  negatively
impacted  by  the  COVID-19  pandemic  and  associated  economic  uncertainty,  and  such  impact  may  be  exacerbated  as  the  COVID-19  pandemic  evolves  or  by  other
unforeseen events or public health emergencies. Additional funds may not be available to us on acceptable terms or at all. If we raise additional funds by issuing equity
securities, our stockholders will suffer dilution and the terms of any financing may adversely affect the rights of our stockholders. In addition, as a condition to providing
additional  funds  to  us,  future  investors  may  demand,  and  may  be  granted,  rights  superior  to  those  of  existing  stockholders.  Debt  financing,  if  available,  is  likely  to
involve restrictive covenants limiting our flexibility in conducting future business activities, and, in the event of insolvency, debt holders would be repaid before holders
of our equity securities received any distribution of our corporate assets.

Due  to  the  significant  resources  required  for  the  development  of  our  drug  candidates,  we  must  prioritize  development  of  certain  drug  candidates  and/or  certain
disease indications. We may expend our limited resources on candidates or indications that do not yield a successful product and fail to capitalize on drug candidates
or indications that may be more profitable or for which there is a greater likelihood of success.

We plan to continue to develop a pipeline of drug candidates to slow, halt, or reverse diseases of aging. Our clinical development strategy is initially focused on the
development of senolytic medicines designed to be administered locally into diseased tissue and we are currently advancing programs in ophthalmologic disorders. We
are  also  in  the  early  stages  of  developing  medicines  that  target  cellular  senescence  and  other  biologies  of  aging  to  treat  additional  diseases  of  aging,  such  as
neurodegenerative diseases.

We  seek  to  maintain  a  process  of  prioritization  and  resource  allocation  among  our  programs  to  maintain  a  balance  between  aggressively  advancing  lead  programs  in
identified  indications  and  exploring  additional  indications  and/or  mechanisms  related  to  diseases  of  aging.  However,  due  to  the  significant  resources  required  for  the
development of our drug candidates, we must focus on specific diseases and disease pathways and decide which drug candidates
to pursue and the amount of resources to allocate to each. In response to the COVID-19 pandemic, we implemented a reduced onsite staffing model in mid-March 2020,
and  as  the  COVID-19  pandemic  evolves  we  may  be  required  to  take  additional  actions  that  impact  the  prioritization  of  programs  as  required  by  applicable  laws  or
regulations, or which we determine to be in the best interest of our employees.

39

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Our near-term objective is to demonstrate in our clinical studies that local treatment with senolytic molecules can alter the course of diseases of aging. To accomplish this
goal, we completed an Investigational New Drug application, or IND-enabling non-clinical toxicology studies with UBX1325, a senolytic, small molecule inhibitor of
the anti-apoptotic Bcl-2 family member, Bcl-xL in the third quarter of 2020. We initiated a Phase 1 clinical study of UBX1325 in October 2020 and, assuming clinical
sites are able to recruit and retain investigators and study staff, and continue to enroll patients, and patients are able to complete all study visits, we expect to receive
initial safety and tolerability data results from the Phase 1 clinical study in the first half of 2021. However, the impact of the COVID-19 pandemic on the timing of study
initiations, enrollment, visit adherence, and completions is difficult to assess due the rapidly evolving nature of the situation and it is possible that the study enrollment,
visit adherence and completion may be delayed.

Our decisions concerning the allocation of research, development, collaboration, management and financial resources toward particular drug candidates or therapeutic
areas may not lead to the development of any viable commercial product and may divert resources away from better opportunities. Similarly, our potential decisions to
delay,  terminate  or  collaborate  with  third  parties  in  respect  of  certain  programs  may  subsequently  also  prove  to  be  suboptimal  and  could  cause  us  to  miss  valuable
opportunities.  If  we  make  incorrect  determinations  regarding  the  viability  or  market  potential  of  any  of  our  programs  or  drug  candidates  or  misread  trends  in  the
biopharmaceutical  industry,  particularly  those  segments  focused  on  aging,  our  business,  financial  condition  and  results  of  operations  could  be  materially  adversely
affected. As a result, we may fail to capitalize on viable commercial products or profitable market opportunities, be required to forego or delay pursuit of opportunities
with other drug candidates or other diseases and disease pathways that may later prove to have greater commercial potential than those we choose to pursue, or relinquish
valuable  rights  to  such  drug  candidates  through  collaboration,  licensing  or  other  royalty  arrangements  in  cases  where  it  may  have  been  more  advantageous  for  us  to
invest additional resources to retain development and commercialization rights.

Interim, “top-line” and preliminary data from our clinical trials that we announce or publish from time to time may change as more patient data become available
and are subject to audit and verification procedures that could result in material changes in the final data.

From time to time, we may publicly disclose top-line or preliminary data from our clinical trials, which is based on a preliminary analysis of then-available data, and the
results and related findings and conclusions are subject to change following a more comprehensive review of the data related to the particular study or trial. We also
make assumptions, estimations, calculations and conclusions as part of our analyses of data, and we may not have received or had the opportunity to fully and carefully
evaluate  all  data.  As  a  result,  the  top-line  or  preliminary  results  that  we  report  may  differ  from  future  results  of  the  same  studies,  or  different  conclusions  or
considerations  may  qualify  such  results,  once  additional  data  have  been  received  and  fully  evaluated.  Top-line  or  preliminary  data  also  remain  subject  to  audit  and
verification procedures that may result in the final data being materially different from the top-line or preliminary data we previously published. As a result, top-line and
preliminary data should be viewed with caution until the final data are available.

From time to time, we may also disclose interim data from our preclinical studies and clinical trials. Interim data from clinical trials that we may conduct are subject to
the risk that one or more of the clinical outcomes may materially change as patient enrollment continues and more patient data become available. Adverse differences
between  interim  data  and  final  data  could  significantly  harm  our  business  prospects.  Further,  disclosure  of  interim  data  by  us  or  by  our  competitors  could  result  in
volatility in the price of our common stock.

Further, others, including regulatory agencies, may not accept or agree with our assumptions, estimates, calculations, conclusions or analyses or may interpret or weigh
the importance of data differently, which could impact the value of the particular program, the approvability or commercialization of the particular product candidate or
product,  our  ability  to  make  certain  claims  about  our  products,  and  our  company  in  general.  In  addition,  the  information  we  choose  to  publicly  disclose  regarding  a
particular study or clinical trial is based on what is typically extensive information, and you or others may not agree with what we determine is material or otherwise
appropriate information to include in our disclosure.

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If the interim, top-line or preliminary data that we report differ from actual results, or if others, including regulatory authorities, disagree with the conclusions reached,
our ability to obtain approval for, and commercialize, our product candidates may be harmed, which could harm our business, operating results, prospects or financial
condition.

Our operating results may fluctuate significantly, which makes our future operating results difficult to predict and could cause our operating results to fall below
expectations.

Our quarterly and annual operating results may fluctuate significantly, making it difficult for us to predict our future operating results. These fluctuations may occur due
to a variety of factors, many of which are outside of our control and may be difficult to predict, including:

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the timing, cost and level of investment in research, development and, if approved, commercialization activities relating to our drug candidates, which may
change from time to time;

the timing and status of enrollment for our clinical studies;

the cost of manufacturing our drug candidates, as well as building out our supply chain, which may vary depending on the quantity of production and the
terms of our agreements with manufacturers;

expenditures we may incur to acquire, develop or commercialize additional drug candidates and technologies;

timing and amount of any milestone, royalty or other payments due under any collaboration or license agreement;

future accounting pronouncements or changes in our accounting policies;

the timing and success or failure of preclinical studies and clinical studies for our drug candidates or competing drug candidates, or any other change in the
competitive landscape of our industry, including consolidation among our competitors or partners;

the timing of receipt of approvals for our drug candidates from regulatory authorities in the United States and internationally;

coverage and reimbursement policies with respect to our drug candidates, if approved, and potential future drugs that compete with our products;

the level of demand for our products, if approved, which may vary significantly over time; and

potential disruption caused by the COVID-19 pandemic or other unforeseen events and public health emergencies.

The cumulative effects of these factors could result in large fluctuations and unpredictability in our quarterly and annual operating results. As a result, comparing our
operating results on a period-to-period basis may not be meaningful. Investors should not rely on our past results as an indication of our future performance.

This variability and unpredictability could also result in our failing to meet the expectations of industry or financial analysts or investors for any period. If our revenue or
operating results fall below the expectations of analysts or investors or below any forecasts we may provide to the market, or if the forecasts we provide to the market are
below the expectations of analysts or investors, the price of our common stock could decline substantially. Such a stock price decline could occur even when we have
met any previously publicly stated revenue or earnings guidance we may provide.

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Risks Related to Our Business and Product Development

Our core therapeutic approach to slow, halt, or reverse diseases of aging is based on our understanding of cellular senescence. Utilizing senolytic molecules to treat
diseases of aging is a novel therapeutic approach, which exposes us to unforeseen risks and makes it difficult to predict the time and cost of drug development and
potential for regulatory approval.

We  are  developing  a  pipeline  of  drug  candidates  to  treat  diseases  of  aging.  Our  foundational  science  and  lead  drug  candidates  are  based  on  senescence  biology.  We
believe that we can develop drug candidates capable of eliminating or modulating accumulated senescent cells, when administered locally. In our development efforts we
intend to explore senolytic medicines that use multiple modalities. However, our approach to treating diseases of aging is novel and the scientific research that forms the
basis of our efforts to develop senolytic medicines is ongoing. We have only recently begun testing our senolytic molecules in humans and the majority of our current
data supporting our hypothesis regarding senescence biology is limited to pre-clinical animal models and in vitro cell lines, the results of which may not translate into
humans.  We  currently  have  no  conclusive  evidence  in  humans,  that  the  accumulation  or  modulation  of  senescent  cells  is  the  underlying  cause  of  tissue  damage  and
dysfunction associated with many diseases of aging. For example, in August 2020, we announced the 12-week results from our Phase 2 study of UBX0101 in patients
with moderate-to-severe painful OA of the knee. UBX0101 is an inhibitor of the p53-MDM2 interaction. There was no statistically significant difference between any
arm of UBX0101 and placebo at the 12-week endpoint for change from baseline in WOMAC-A, an established measurement of pain in OA. Given these results, we are
not  progressing  UBX0101  into  pivotal  studies  and  decided  not  to  pursue  further  development  of  this  product  candidate.  We  will  narrow  our  near-term  focus  to  our
ongoing ophthalmologic and neurologic disease programs. Our current program, UBX1325, is a Bcl-xL inhibitor, and is intended to target senescent cells in the eye.
While cellular senescence is a naturally occurring biological process, the administration of senolytic medicines to eliminate or cause the elimination or modulation of
accumulated senescent cells in humans has not been widely tested and may potentially harm healthy tissue or result in unforeseen safety events, or fail to achieve the
intended  therapeutic  purpose  entirely.  We  may  also  ultimately  discover  that  our  senolytic  molecules  do  not  possess  certain  properties  required  for  therapeutic
effectiveness, or that even if found to be effective in one type of tissue, that such molecules will be effective in other tissues. In addition, given the novel nature of this
therapeutic  approach,  designing  preclinical  and  clinical  studies  to  demonstrate  the  effect  of  senolytic  medicines  is  complex  and  exposes  us  to  unforeseen  risks.  In
addition, the scientific evidence to support the feasibility of developing systemic senolytic medicines is based primarily on preclinical data and not human clinical trials.
We may spend substantial funds attempting to develop these drug candidates and never succeed in doing so.

No regulatory authority has granted approval for a senolytic medicine. As such, we believe the U.S. Food and Drug Administration, or the FDA, has limited experience
with senescence, which may increase the complexity, uncertainty and length of the clinical development and regulatory approval process for our drug candidates. We
may never receive approval to market and commercialize any drug candidate. Even if we obtain regulatory approval, the
approval may be for targets, disease indications or patient populations that are not as broad as we intended or desired or may require labeling that includes significant use
or  distribution  restrictions  or  safety  warnings.  We  may  be  required  to  perform  additional  or  unanticipated  clinical  studies  to  obtain  approval  or  be  subject  to  post-
marketing testing requirements to maintain marketing authorization. If our other senolytic molecules prove to be ineffective, unsafe or commercially unviable, our entire
senolytic platform and pipeline would have little, if any, value, which would have a material and adverse effect on our business, financial condition, results of operations
and prospects.

Our business is dependent on the successful development, regulatory approval, and commercialization of our drug candidates, all of which are in early stages of
development and none of which have shown definitive efficacy in human subject.

We have no products approved for sale and all of our drug candidates are in early stages of development. Additionally, following the 12-week results from our Phase 2
study  of  UBX0101  in  patients  with  moderate-to-severe  painful  OA  of  the  knee  showed  no  statistically  significant  difference  between  UBX0101  and  placebo  for  the
primary  endpoint  of  change,  we  decided  not  to  pursue  further  development  of  this  product  candidate.  To  advance  our  ophthalmology  program,  we  completed  IND-
enabling studies, and in July 2020, we filed an IND for our lead drug candidate, UBX1325. We initiated a Phase 1 clinical study of UBX1325 in October 2020. However,
the impact of the COVID-19 pandemic on the timing of study enrollment, visit adherence, and completions is hard to assess

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due the rapidly evolving nature of the situation and it is possible that the study enrollment, visit adherence and completion may be delayed.

UBX0101 and UBX1325 are the only drug candidates that we have administered to humans, and as such, we face significant translational risk with our drug candidates.
We may also be required by the FDA or similar foreign regulatory agencies to conduct additional preclinical studies beyond those planned to support the commencement
of  additional  clinical  trials.  For  example,  in  preclinical  studies,  we  observed  that  UBX1967  showed  sustained  exposure  in  ocular  tissues  of  interest  after  intravitreal
injection. After engaging the FDA regarding the design of IND-enabling studies for UBX1967, we determined that the duration of such preclinical studies would be
longer  than  originally  anticipated  due  to  the  extended  exposure  profile,  delaying  the  commencement  of  our  initial  Phase  1  study  for  age-related  eye  diseases.  In  the
second quarter of 2020, we decided to commence our initial Phase 1 clinical study in
ophthalmology disease with UBX1325 in part because of its shorter exposure profile.

The success of our business, including our ability to finance our company and generate any revenue in the future, will primarily depend on the successful development,
regulatory approval and commercialization of drug candidates from our senolytic medicine pipeline. However, given our early stage of development, it may be many
years, if we succeed at all, before we have demonstrated the safety and efficacy of a drug candidate sufficient to warrant approval for commercialization.

In the future, we may also become dependent on other drug candidates that we may develop or acquire. The clinical and commercial success of our drug candidates and
future drug candidates will depend on a number of factors, including the following:

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our ability to raise any additional required capital on acceptable terms, or at all;

our ability to complete IND-enabling studies and successfully submit an IND or comparable applications in foreign jurisdictions;

timely completion of our preclinical studies and clinical studies, which may be significantly slower or cost more than we currently anticipate and will depend
substantially  upon  the  performance  of  third-party  contractors,  some  of  whom  could  be  adversely  impacted  by  unforeseen  events  such  as  pandemics  and
public health emergencies, such as the COVID-19 pandemic;

whether we are required by the FDA or similar foreign regulatory agencies to conduct additional clinical studies or other studies beyond those planned to
support the approval and commercialization of our drug candidates or any future drug candidates;

acceptance of our proposed indications and primary endpoint assessments relating to the proposed indications of our drug candidates by the FDA and similar
foreign regulatory authorities;

our ability to demonstrate to the satisfaction of the FDA and similar foreign regulatory authorities the safety, efficacy and acceptable risk-to-benefit profile of
our current drug candidates or any future drug candidates;

the prevalence, duration and severity of potential side effects or other safety issues experienced with our drug candidates or future approved products, if any;

the timely receipt of necessary marketing approvals from the FDA and similar foreign regulatory authorities;

achieving and maintaining, and, where applicable, ensuring that our third-party contractors achieve and maintain compliance with our contractual obligations
and with all regulatory requirements applicable to our current drug candidates or any future drug candidates or approved products, if any;

the  willingness  of  physicians,  professional  societies,  operators  of  clinics,  hospitals,  and  patients  to  recommend,  utilize  or  adopt  any  of  our  future  drug
candidates to treat diseases of aging;

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the  ability  of  third  parties  with  whom  we  contract  to  manufacture  adequate  clinical  study  and  commercial  supplies  of  our  current  drug  candidates  or  any
future drug candidates, to remain in good standing with regulatory agencies and develop, validate and maintain commercially viable manufacturing processes
that are compliant with current good manufacturing practices, or cGMP;

our ability to successfully develop a commercial strategy and thereafter commercialize our drug candidates or any future drug candidates in the United States,
and internationally, if approved for marketing, reimbursement, sale and distribution in such countries and territories, whether alone or in collaboration with
others;

the convenience of our treatment or dosing regimen;

acceptance by physicians, payors and patients of the benefits, safety and efficacy of our drug candidates or any future drug candidates, if approved, including
relative to alternative and competing treatments;

patient demand for our drug candidates, if approved;

our ability to establish and enforce intellectual property rights in and to our drug candidates or any future drug candidates; and

our ability to avoid third-party patent interference, intellectual property challenges or intellectual property infringement claims.

These factors, many of which are beyond our control, could cause us to experience significant delays or be unable to obtain regulatory approvals or commercialize our
drug candidates. In addition, disruptions caused by the COVID-19 pandemic may increase the likelihood that we encounter such difficulties or delays in developing,
obtaining  regulatory  approvals  for  or  commercializing  our  product  candidates.  Even  if  regulatory  approvals  are  obtained,  we  may  never  achieve  success  in
commercializing any of our drug candidates. Accordingly, we cannot provide assurances that we will be able to generate sufficient revenue through the sale of our drug
candidates or any future drug candidates to continue our business or achieve profitability.

The COVID-19 pandemic could adversely impact our business, including our clinical trials, and financial condition.

In  December  2019,  a  novel  strain  of  coronavirus,  COVID-19,  was  reported  to  have  surfaced  in  Wuhan,  China.  Since  then,  the  COVID-19  pandemic  has  spread  to
multiple countries, including the United States, in which we have planned or active clinical trial sites. The pandemic and government measures taken in response have
also had a significant impact, both direct and indirect, on businesses and commerce, as worker shortages have occurred, supply
chains have been disrupted, facilities and production have been suspended, and demand for certain goods and services, such as medical services and supplies, has spiked,
while demand for other goods and services, such as travel, has fallen. In response to the spread of COVID-19, as of mid-March 2020, we transitioned to a reduced onsite
staffing model and implemented a remote work plan for all of our employees other than those providing essential
services, such as our laboratory staff. For those onsite employees, we have implemented heightened safety measures designed to comply with applicable federal, state
and local guidelines. We may be required to take additional actions that could impact our operations if required by applicable laws or regulations or if we determine to be
in the best interests of our employees.

For  the  Phase  1  safety  and  tolerability  clinical  study  for  UBX1325,  we  adapted  the  clinical  study  protocol  and  standard  operating  procedures  to  enable  a  number  of
adaptations  such  as:  remote  data  collection  for  clinical  sites  when  possible;  the  option  for  remote  data  source  verification  procedures  to  limit  on-site  monitoring;
transportation options for patients to utilize for study visit adherence; selection and use of central reading centers and centralized laboratories that do not require source
data verification; flexible visit windows to increase study visit adherence; and geographic distribution of sites to mitigate variation in local restrictions. For the Phase 2a
proof of concept clinical study for UBX1325, we will be making similar adaptations to accommodate patients and sites for the COVID-19 pandemic.

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These actions enable the collection of all major endpoints if patients adhere with the study visit schedule. Assessments that require an on-site visit may be missed for
some or all patients including laboratory evaluations, clinical examinations, or imaging.

Although one of the manufacturers in our supply chain for UBX0101 experienced a two-week shutdown in April 2020 due to a COVID-19 related incident and there
have been some delays in shipments due to a reduction in overall flights, neither of these factors impacted our supply of UBX0101 prior to our decision to shut down
further clinical advancement of that program. There have been no other disruptions in our supply chain of drug manufacturers necessary to conduct our ongoing clinical
trials, including our recently initiated Phase 1 study in ophthalmology disease.

Several of the contract research organizations, or CROs, that provide preclinical services to us are based in China and India and experienced temporary shutdowns in
February and March due to government mandates. In each case we were able to reassign the balance of activities to other CROs and the shutdowns did not impact our
preclinical  timelines.  CROs  based  in  the  United States  that  provide  preclinical  services  are  experiencing  heavy  demand,  which  may  impact  their  ability  to  start  new
studies and could lead to delays in the commencement of our preclinical studies. Several of our U.S.-based academic research partners have also experienced shutdowns
which has slowed progress on several early stage projects, none of which impacted our preclinical timelines.

As  the  COVID-19  pandemic  continues  to  spread  around  the  globe,  we  will  likely  experience  disruptions  that  could  severely  impact  our  business  and  clinical  trials,
including:

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delays or difficulties in enrolling patients in our clinical trials;

delays or difficulties in clinical site initiation, including difficulties in recruiting clinical site investigators and clinical site staff;

diversion of healthcare resources away from the conduct of clinical trials, including the diversion of hospitals serving as our clinical trial sites and hospital
staff supporting the conduct of our clinical trials;

interruption  of  key  clinical  trial  activities,  such  as  clinical  trial  site  monitoring,  due  to  limitations  on  travel  imposed  or  recommended  by  federal  or  state
governments, employers and others or interruption of clinical trial subject visits and study procedures, the occurrence of which could affect the integrity of
clinical trial data;

risk that participants enrolled in our clinical trials will contract the COVID-19 coronavirus while the clinical trial is ongoing, which could impact the results
of the clinical trial, including by increasing the number of observed adverse events;

limitations in employee resources that would otherwise be focused on the conduct of our clinical trials, including because of sickness of employees or their
families or the desire of employees to avoid contact with large groups of people;

delays in receiving authorizations from local regulatory authorities to initiate our planned clinical trials;

delays in clinical sites receiving the supplies and materials needed to conduct our clinical trials;

interruption in global shipping that may affect the transport of clinical trial materials, such as investigational drug product used in our clinical trials;

changes  in  local  regulations  as  part  of  a  response  to  the  COVID-19  pandemic  which  may  require  us  to  change  the  ways  in  which  our  clinical  trials  are
conducted, which may result in unexpected costs, or to discontinue such clinical trials altogether;

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interruptions or delays in preclinical studies due to restricted or limited operations at our research and development laboratory facilities;

delays  in  necessary  interactions  with  local  regulators,  ethics  committees  and  other  important  agencies  and  contractors  due  to  limitations  in  employee
resources or forced furlough of government employees; and

refusal of the FDA to accept data from clinical trials in affected geographies outside the United States.

The global pandemic of the COVID-19 coronavirus continues to rapidly evolve. The extent to which the COVID-19 pandemic may impact our business, including our
clinical  trials,  and  financial  condition  will  depend  on  future  developments,  which  are  highly  uncertain  and  cannot  be  predicted  with  confidence,  such  as  the  ultimate
geographic spread of the disease, the duration of the pandemic, travel restrictions and social distancing in the United States and other countries, business closures or
business disruptions and the effectiveness of actions taken in the United States and other countries to contain and treat the disease.

We may be unable to obtain regulatory approval for our drug candidates under applicable regulatory requirements. The denial or delay of any such approval would
delay commercialization of our drug candidates and adversely impact our potential to generate revenue, our business and our results of operations.

To gain approval to market our drug candidates, we must provide the FDA and foreign regulatory authorities with clinical data that adequately demonstrate the safety and
efficacy  of  the  drug  candidate  for  the  intended  indication  applied  for  in  the  applicable  regulatory  filing.  For  our  senolytic  medicines,  we  must  also  demonstrate  that
eliminating or causing the elimination of senescent cells and modulating relevant associated SASP factors will lead to the improvement of well-defined and measurable
endpoints.

We  have  not  previously  submitted  a  new  drug  application,  or  NDA,  or  biologics  license  application,  or  BLA,  to  the  FDA,  or  similar  approval  filings  to  comparable
foreign  regulatory  authorities.  An  NDA,  BLA  or  other  relevant  regulatory  filing  must  include  extensive  preclinical  and  clinical  data  and  supporting  information  to
establish that the drug candidate is safe and effective, or that a biological drug candidate is safe, pure and potent for each desired
indication. The NDA, BLA or other relevant regulatory submission must also include significant information regarding the chemistry, manufacturing and controls for the
product.

The research, testing, manufacturing, labeling, approval, sale, marketing and distribution of drug and biologic products are subject to extensive regulation by the FDA
and other regulatory authorities in the United States and other countries, and such regulations differ from country to country. We are not permitted to market our drug
candidates in the United States or in any foreign countries until they receive the requisite approval from the applicable regulatory authorities of such jurisdictions.

The FDA or any foreign regulatory bodies can delay, limit or deny approval of our drug candidates for many reasons, including:

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our inability to demonstrate to the satisfaction of the FDA or the applicable foreign regulatory body that any of our drug candidates is safe and effective for
the requested indication;

the FDA’s or the applicable foreign regulatory agency’s disagreement with our trial protocol or the interpretation of data from preclinical studies or clinical
studies;

our inability to demonstrate that the clinical and other benefits of any of our drug candidates outweigh any safety or other perceived risks;

the FDA’s or the applicable foreign regulatory agency’s requirement for additional preclinical studies or clinical studies;

the FDA’s or the applicable foreign regulatory agency’s failure to approve the formulation, labeling or specifications of UBX1325, UBX1967, or any of our
future drug candidates;

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the FDA’s or the applicable foreign regulatory agency’s failure to approve the manufacturing processes or facilities of third-party manufacturers upon which
we rely; or

the potential for approval policies or regulations of the FDA or the applicable foreign regulatory agencies to significantly change in a manner that renders our
clinical data insufficient for approval.

Of  the  large  number  of  biopharmaceutical  and  pharmaceutical  products  in  development,  only  a  small  percentage  successfully  complete  the  FDA  or  other  regulatory
approval processes and are commercialized.

Even  if  we  eventually  complete  clinical  testing  and  receive  approval  from  the  FDA  or  applicable  foreign  agencies  for  any  of  our  drug  candidates,  the  FDA  or  the
applicable foreign regulatory agency may grant approval contingent on the performance of costly additional clinical studies which may be required after approval. The
FDA or the applicable foreign regulatory agency also may approve our current drug candidates for limited indications or narrower patient populations than we originally
requested, and the FDA, or applicable foreign regulatory agency, may not approve our drug candidates with the labeling that we believe is necessary or desirable for the
successful commercialization of such drug candidates.

Any delay in obtaining, or inability to obtain, applicable regulatory approval would delay or prevent commercialization of our drug candidates and would materially
adversely impact our business and prospects.

Disruptions at the FDA and other government agencies caused by funding shortages or global health concerns could hinder their ability to hire, retain or deploy key
leadership  and  other  personnel,  or  otherwise  prevent  new  or  modified  products  from  being  developed,  approved  or  commercialized  in  a  timely  manner  or  at  all,
which could negatively impact our business.

The ability of the FDA to review and or approve new products can be affected by a variety of factors, including government budget and funding levels and internal
allocation, statutory, regulatory, and policy changes, the FDA’s ability to hire and retain key personnel and accept the payment of user fees, and other events that may
otherwise affect the FDA’s ability to perform routine functions. Average review times at the FDA have fluctuated in recent years as a result. In addition, government
funding  of  other  government  agencies  that  fund  research  and  development  activities  is  subject  to  the  political  process,  which  is  inherently  fluid  and  unpredictable.
Disruptions  at  the  FDA  and  other  agencies  may  also  slow  the  time  necessary  for  new  drugs  and  biologics  to  be  reviewed  and/or  approved  by  necessary  government
agencies, which would adversely affect our business. For example, over the last several years, including for 35 days
beginning on December 22, 2018, the U.S. government has shut down several times and certain regulatory agencies, such as the FDA, have had to furlough critical FDA
employees and stop critical activities.

Separately,  in  response  to  the  COVID-19  pandemic,  on  March  10,  2020  the  FDA  announced  its  intention  to  postpone  most  foreign  inspections  of  manufacturing
facilities, and on March 18, 2020, the FDA temporarily postponed routine surveillance inspections of domestic manufacturing facilities. Subsequently, on July 10, 2020
the FDA announced its intention to resume certain on-site inspections of domestic manufacturing facilities subject to a risk-based prioritization system. The FDA intends
to use this risk-based assessment system to identify the categories of regulatory activity that can occur within a given geographic area, ranging from mission critical
inspections to resumption of all regulatory activities. Regulatory authorities outside the United States may adopt similar restrictions or other policy measures in response
to the COVID-19 pandemic. If a prolonged government shutdown occurs, or if global health concerns continue to prevent the FDA or other regulatory authorities from
conducting their regular inspections, reviews, or other regulatory activities, it could significantly impact the ability of the FDA or other regulatory authorities to timely
review and process our regulatory submissions, which could have a material adverse effect on our business.

Clinical development involves a lengthy and expensive process with an uncertain outcome, and results of earlier studies and trials may not be predictive of future
trial results.

Clinical testing is expensive and can take many years to complete, and its outcome is inherently uncertain. Failure or delay can occur at any time during the clinical study
process. Success in preclinical studies and early clinical studies does not ensure that later clinical studies will be successful. A number of companies in the biotechnology,
and

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pharmaceutical industries have suffered significant setbacks in clinical studies, even after positive results in earlier preclinical studies or clinical studies. These setbacks
have been caused by, among other things, preclinical findings made while clinical studies were underway and safety or efficacy observations made in clinical studies,
including previously unreported adverse events. The results of our preclinical animal studies or studies in ex vivo human tissues may not be predictive of the results of
outcomes in human clinical studies. For example, our senolytic molecules may demonstrate different chemical and pharmacological properties in patients than they do in
laboratory studies or may interact with human biological systems in unforeseen or harmful ways.

Additionally, with respect to our initial clinical trials for our senolytic drug candidates, we may be unable to accurately predict whether or in what manner we will be able
to measure the impact of a drug candidate on relevant SASP factors and disease biomarkers.

Drug candidates in later stages of clinical studies may fail to show the desired pharmacological properties or safety and efficacy traits despite having progressed through
preclinical studies and initial clinical studies. Notwithstanding any promising results in earlier studies, we cannot be certain that we will not face similar setbacks. Even if
we are able to initiate and complete clinical studies, the results may not be sufficient to obtain regulatory approval for our drug candidates.

Although we initiated our Phase 1 safety and tolerability clinical study for UBX1325 in October 2020, we may experience delays in obtaining FDA authorization or
feedback to initiate further studies of UBX1325, or in completing our ongoing studies of UBX1325. We cannot be certain that studies or trials for our drug candidates
will begin on time, not require redesign, enroll an adequate number of subjects on time or be completed on schedule, if at all. The COVID-19 pandemic could cause or
exacerbate these factors. For example, for our ongoing Phase 1 study for UBX1325, clinical sites may be unable to recruit and retain investigators and study staff, screen
and enroll patients, patients may be unable to adhere to the study visit schedule, and the completion of the study could be delayed. Clinical studies can be prolonged,
delayed or terminated for a variety of reasons, including:

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the FDA or comparable foreign regulatory authorities disagreeing with or requiring changes to the design or implementation of our clinical studies;

delays in obtaining regulatory approval to commence or continue a trial;

reaching agreement on acceptable terms with prospective contract research organizations, or CROs, and clinical study sites, the terms of which can be subject
to extensive negotiation and may vary significantly among different CROs and trial sites;

obtaining institutional review board, or IRB, approval at each trial site;

recruiting an adequate number of suitable patients to participate in a trial;

having subjects complete a trial or return for post-treatment follow-up;

encountering  difficulties  in  gathering  the  range  of  biological  data  from  patients  needed  to  fully  assess  the  impact  of  our  drug  candidates,  such  as  the
challenges we encountered in collecting synovial fluid from OA patients in the single ascending dose portion of our Phase 1 clinical study;

clinical sites deviating from trial protocol or dropping out of a trial;

addressing subject safety concerns that arise during the course of a trial;

adding a sufficient number of clinical study sites; or

obtaining  sufficient  product  supply  of  drug  candidate  for  use  in  preclinical  studies  or  clinical  studies  from  third-party  suppliers  some  of  whom  could  be
adversely impacted by unforeseen events such as pandemics and public health emergencies, such as the COVID-19 pandemic.

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We may experience numerous adverse or unforeseen events during, or as a result of, preclinical studies and clinical studies that could delay or prevent our ability to
receive marketing approval or commercialize our drug candidates, including:

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clinical studies of our drug candidates may produce negative or inconclusive results, and we may decide, or regulators may require us, to modify clinical
study design, conduct additional clinical studies or abandon drug development programs, including all of our senolytic programs;

the number of patients required for clinical studies of our drug candidates may be larger than we anticipate, enrollment in these clinical studies may be slower
than we anticipate, or participants may drop out of these clinical studies at a higher rate than we anticipate;

our  third-party  contractors  may  fail  to  comply  with  regulatory  requirements,  fail  to  maintain  adequate  quality  controls,  or  be  unable  to  provide  us  with
sufficient product supply to conduct and complete preclinical studies or clinical studies of our drug candidates in a timely manner, or at all;

we  or  our  investigators  might  have  to  suspend  or  terminate  clinical  studies  of  our  drug  candidates  for  various  reasons,  including  noncompliance  with
regulatory requirements, a finding that our drug candidates have undesirable side effects or other unexpected characteristics, a finding that the participants are
being exposed to unacceptable health risks, or due to unforeseen events such as pandemics and public health emergencies, such as the COVID-19 pandemic;
the cost of clinical studies of our drug candidates may be greater than we anticipate;

the quality of our drug candidates or other materials necessary to conduct preclinical studies or clinical studies of our drug candidates may be inadequate;

regulators may revise the requirements for approving our drug candidates, or such requirements may not be as we anticipate; and

future collaborators may conduct clinical studies in ways they view as advantageous to them but that are suboptimal for us.

If  we  are  required  to  conduct  additional  clinical  studies  or  other  testing  of  our  drug  candidates  beyond  those  that  we  currently  contemplate,  if  we  are  unable  to
successfully complete clinical studies of our drug candidates or other testing, if the results of these trials or tests are not positive or are only moderately positive, or if
there are safety concerns, we may:

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incur unplanned costs;

be delayed in obtaining marketing approval for our drug candidates or fail to obtain marketing approval at all;

obtain marketing approval in some countries and not in others;

obtain marketing approval for indications or patient populations that are not as broad as intended or desired;

obtain marketing approval with labeling that includes significant use or distribution restrictions or safety warnings, including boxed warnings;

be subject to additional post-marketing testing requirements; or

have the treatment removed from the market after obtaining marketing approval.

We could also encounter delays if a clinical study is suspended or terminated by us, by the IRBs of the institutions in which such trials are being conducted, by the Data
Safety Monitoring Board, or DSMB, for such trial or by the FDA or other regulatory authorities. Such authorities may suspend or terminate a clinical study due to a
number of

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factors, including failure to conduct the clinical study in accordance with regulatory requirements or our clinical protocols, inspection of the clinical study operations or
trial site by the FDA or other regulatory authorities resulting in the imposition of a clinical hold, unforeseen safety issues or adverse side effects, failure to demonstrate a
benefit from using a drug, changes in governmental regulations or administrative actions or lack of adequate funding to continue the clinical study.

Further, conducting clinical studies in foreign countries, as we may do for certain of our drug candidates, presents additional risks that may delay completion of our
clinical studies. These risks include the failure of enrolled patients in foreign countries to adhere to clinical protocol as a result of differences in healthcare services or
cultural customs, managing additional administrative burdens associated with foreign regulatory schemes, as well as political and economic risks relevant to such foreign
countries, including those caused by unforeseen events such as pandemics and public health emergencies similar to the COVID-19 pandemic.

Principal investigators for our clinical studies may serve as scientific advisors or consultants to us from time to time and may receive cash or equity compensation in
connection with such services. If these relationships and any related compensation result in perceived or actual conflicts of interest, or a regulatory authority concludes
that the financial relationship may have affected the interpretation of the trial, the integrity of the data generated at the applicable clinical study site may be questioned
and the utility of the clinical study itself may be jeopardized, which could result in the delay or rejection of the marketing application we submit. Any such delay or
rejection could prevent or delay us from commercializing our current or future drug candidates.

If  we  experience  termination  or  delays  in  the  completion  of  any  preclinical  study  or  clinical  study  of  our  drug  candidates,  the  commercial  prospects  of  our  drug
candidates may be harmed, and our ability to generate revenues from any of these drug candidates will be delayed or unrealized. In addition, any delays in completing
our clinical studies may increase our costs, slow down our drug candidate development and approval process and jeopardize our ability to commence product sales and
generate revenues. Any of these occurrences may significantly harm our business, financial condition and prospects. In addition, many of the factors that cause, or lead
to, a delay in the commencement or completion of clinical studies may also ultimately lead to the denial of regulatory approval of our drug candidates. If one or more of
our drug candidates or our senescence technology generally prove to be ineffective, unsafe or commercially unviable, our platform and pipeline would have significantly
diminished value, which would have a material and adverse effect on our business, financial condition, results of operations and prospects.

We may not be successful in our efforts to continue to create a pipeline of drug candidates or to develop commercially successful products. If we fail to successfully
identify and develop additional drug candidates, our commercial opportunity may be limited.

We are committed to developing senolytic medicines that slow, halt, or reverse diseases of aging, and we are currently advancing multiple senolytic molecules to address
a variety of diseases of aging, including ophthalmologic and neurologic disorders. As senolytic medicines are not limited to intervention by a single mode of action or
molecular target, we believe that we can modulate a number of biologic pathways in order to trigger the beneficial elimination of senescent cells. However, our core
therapeutic approach is based on our belief that senescent cells drive diseases of aging, and that hypothesis has not yet been proven. In addition, we do not know if we
will be able to develop medicines that selectively eliminate senescent cells or whether the elimination of such senescent cells will mitigate the effects of or effectively
treat any diseases.

In addition, identifying, developing, obtaining regulatory approval and commercializing drug candidates for the treatment of diseases of aging will require substantial
additional funding and is prone to the risks of failure inherent in drug development. Research programs to identify drug candidates also require substantial technical,
financial and human resources, regardless of whether or not any drug candidates are ultimately identified, and even if our preclinical research programs initially show
promise in identifying potential drug candidates, they may fail to yield drug candidates for clinical development.

While we have a number of ongoing drug discovery programs targeting senescent cells, we do not know whether these will be successful, or whether we will be able to
identify  novel  senolytic  mechanisms  to  continue  to  build  our  pipeline.  We  also  cannot  provide  any  assurance  that  we  will  be  able  to  successfully  identify  or  acquire
additional

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drug candidates, advance any of these additional drug candidates through the development process, successfully commercialize any such additional drug candidates, if
approved,  or  assemble  sufficient  resources  to  identify,  acquire,  develop  or,  if  approved,  commercialize  additional  drug  candidates.  If  we  are  unable  to  successfully
identify, acquire, develop and commercialize additional drug candidates, our commercial opportunities may be limited.

It may be many years, if ever, before we develop senolytic medicines capable of systemic administration to treat systemic diseases of aging.

Many  diseases  of  aging  may  require  the  development  of  senolytic  medicines  that  can  be  administered  systemically.  We  currently  do  not  have  systemic  senolytic
medicines  in  development,  and  we  do  not  know  whether  systemic  senolytic  approaches  will  be  feasible.  We  are  focusing  initially  on  the  development  of  senolytic
molecules for diseases of aging that can be treated by means of local treatment and intend to continue our research into the development of systemic senolytic medicines.
However, we are still at a very early stage of developing locally administered senolytic medicines, and we must establish proof-of-concept in humans for local treatment
before developing a systemically administered senolytic medicine. We still face significant risks in the development of localized treatments. As a result, it may be many
years before we have sufficient human data and scientific understanding to effectively pursue a systemically administered senolytic medicine, if ever.

If we encounter difficulties enrolling patients in our clinical studies, our clinical development activities could be delayed or otherwise adversely affected.

The timely completion of clinical studies in accordance with their protocols depends, among other things, on our ability to enroll a sufficient number of patients who
remain in the study until its conclusion. We may experience difficulties in patient enrollment in our clinical studies for a variety of reasons. The enrollment of patients
depends on many factors, some of which could be exacerbated by the COVID-19 pandemic, including:

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the patient eligibility criteria defined in the protocol;

the size of the patient population required for analysis of the trial’s primary endpoints;

the proximity of patients to trial sites;

patients’ fear of visiting or traveling to trial sites during the COVID-19 pandemic;

the design of the trial;

our ability to recruit clinical study investigators with the appropriate competencies and experience;

clinicians’ and patients’ perceptions as to the potential advantages of the drug candidate being studied in relation to other available therapies, including any
new drugs that may be approved for the indications we are investigating; and

our ability to obtain and maintain patient consents.

In  addition,  our  clinical  studies  may  compete  with  other  clinical  studies  for  drug  candidates  that  are  in  the  same  therapeutic  areas  as  our  drug  candidates.  This
competition will reduce the number and types of patients available to us, because some patients who might have opted to enroll in our trials may instead opt to enroll in a
trial being conducted by one of our competitors. Since the number of qualified clinical investigators is limited, we may conduct some of our clinical studies at the same
clinical study sites that some of our competitors use, which will reduce the number of patients who are available for our clinical studies in such clinical study site.

Further, the administration of senolytic medicines designed to eliminate or cause the elimination of senescent cells and thereby modulate their associated SASP may
result in unforeseen events, including by harming healthy tissues. As a result, it is possible that safety concerns could negatively affect patient enrollment among the
patient populations that we intend to treat, including among those in indications with a low risk of mortality. Delays in patient enrollment may result in increased costs or
may affect the timing or outcome of the planned clinical studies,

51

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
which could prevent completion of these trials and adversely affect our ability to advance the development of our drug candidates.

Our drug candidates may cause undesirable side effects or have other properties that could delay or prevent their regulatory approval, limit the commercial profile of
an approved label, or result in significant negative consequences following marketing approval, if any.

Undesirable  side  effects  caused  by  our  drug  candidates  could  cause  us  or  regulatory  authorities  to  interrupt,  delay  or  halt  clinical  studies  and  could  result  in  a  more
restrictive label or the delay or denial of regulatory approval by the FDA or comparable foreign regulatory authorities. Other than our clinical studies of UBX0101, and
our Phase 1 clinical study of UBX1325, which was initiated in October 2020, senolytic medicines designed to eliminate or cause
the elimination of senescent cells have never been tested in humans. As a result, even though UBX0101 was generally well tolerated in our completed Phase 1 and Phase
2 clinical studies, any clinical studies we initiate could reveal a high and unacceptable severity and prevalence of side effects, and it is possible that patients enrolled in
such  clinical  studies  could  respond  in  unexpected  ways.  For  instance,  in  preclinical  in  vivo  animal  and  ex  vivo  human  tissue  studies,  our  senolytic  molecules  have
exhibited  clearance  of  senescent  cells;  however,  the  elimination  of  accumulated  senescent  cells  may  result  in  unforeseen  events,  including  harming  healthy  cells  or
tissues. In addition, the entry by cells into a senescent state is a natural biological process that we believe may have protective effects, such as halting the proliferation of
damaged cells. The treatment of tissues with senolytic molecules could interfere with such protective processes.

If unacceptable side effects arise in the development of our drug candidates, we, the FDA, the IRBs at the institutions in which our studies are conducted, or the DSMB
could suspend or terminate our clinical studies, or the FDA or comparable foreign regulatory authorities could order us to cease clinical studies or deny approval of our
drug candidates for any or all targeted indications. Treatment-related side effects could also affect patient recruitment or the ability of enrolled patients to complete any of
our clinical studies or result in potential product liability claims. In addition, these side effects may not be appropriately recognized or managed by the treating medical
staff.  We  expect  to  have  to  train  medical  personnel  using  our  drug  candidates  to  understand  the  side  effect  profiles  for  our  clinical  studies  and  upon  any
commercialization of any of our drug candidates. Inadequate training in recognizing or managing the potential side effects of our drug candidates could result in patient
injury or death. Any of these occurrences may harm our business, financial condition and prospects significantly.

In addition, even if we successfully advance any of our drug candidates into and through clinical studies, such trials will likely only include a limited number of subjects
and limited duration of exposure to our drug candidates. As a result, we cannot be assured that adverse effects of our drug candidates will not be uncovered when a
significantly larger number of patients are exposed to the drug candidate. Further, clinical studies may not be sufficient to determine the effect and safety consequences of
taking our drug candidates over a multi-year period. There can be no assurance that it will demonstrate a similarly favorable safety profile in subsequent clinical trials.

If  any  of  our  drug  candidates  receives  marketing  approval,  and  we  or  others  later  identify  undesirable  side  effects  caused  by  such  products,  a  number  of  potentially
significant negative consequences could result, including:

•

•

•

•

•

•

regulatory authorities may withdraw their approval of the product;

we may be required to recall a product or change the way such product is administered to patients;

additional restrictions may be imposed on the marketing of the particular product or the manufacturing processes for the product or any component thereof;

regulatory authorities may require the addition of labeling statements, such as a “black box” warning or a contraindication;

we may be required to implement a Risk Evaluation and Mitigation Strategy, or REMS, or create a Medication Guide outlining the risks of such side effects
for distribution to patients;

we could be sued and held liable for harm caused to patients;

52

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
•

•

the product may become less competitive; and

our reputation may suffer.

Any of the foregoing events could prevent us from achieving or maintaining market acceptance of the particular drug candidate, if approved, and result in the loss of
significant revenues to us, which would materially and adversely affect our results of operations and business. In addition, if one or more of our drug candidates or our
senescence approach generally prove to be unsafe, our entire platform and pipeline could be affected, which would have a material and adverse effect on our business,
financial condition, results of operations and prospects.

Even if our current drug candidates or any future drug candidates obtain regulatory approval, they may fail to achieve the broad degree of physician and patient
adoption and use necessary for commercial success.

Even  if  one  or  more  of  our  drug  candidates  receive  FDA  or  other  regulatory  approvals,  the  commercial  success  of  any  of  our  current  or  future  drug  candidates  will
depend  significantly  on  the  broad  adoption  and  use  of  the  resulting  product  by  physicians  and  patients  for  approved  indications.  Our  drug  candidates  may  not  be
commercially successful for a variety of reasons, including: competitive factors, pricing or physician preference, reimbursement by
insurers, the degree and rate of physician and patient adoption of our current or future drug candidates. If approved, the commercial success of our drug candidates will
depend on a number of factors, including:

•

•

•

•

•

•

•

•

•

•

•

•

•

•

the clinical indications for which the product is approved and patient demand for approved products that treat those indications;

the safety and efficacy of our product as compared to other available therapies;

the availability of coverage and adequate reimbursement from managed care plans, insurers and other healthcare payors for any of our drug candidates that
may be approved;

acceptance by physicians, operators of clinics and patients of the product as a safe and effective treatment;

physician and patient willingness to adopt a new therapy over other available therapies to treat approved indications;

overcoming any biases physicians or patients may have toward particular therapies for the treatment of approved indications;

proper training and administration of our drug candidates by physicians and medical staff;

public misperception regarding the use of our therapies, or public bias against “anti-aging” companies;

patient satisfaction with the results and administration of our drug candidates and overall treatment experience, including, for example, the convenience of
any dosing regimen;

the cost of treatment with our drug candidates in relation to alternative treatments and reimbursement levels, if any, and willingness to pay for the product, if
approved, on the part of insurance companies and other third-party payers, physicians and patients;

the willingness of patients to pay for certain of our products, if approved;

the revenue and profitability that our products may offer a physician as compared to alternative therapies;

the prevalence and severity of side effects;

limitations or warnings contained in the FDA-approved labeling for our products;

53

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
•

•

•

•

•

the willingness of physicians, operators of clinics and patients to utilize or adopt our products as a solution;

any FDA requirement to undertake a REMS;

the effectiveness of our sales, marketing and distribution efforts;

adverse publicity about our products or favorable publicity about competitive products; and

potential product liability claims.

We cannot assure you that our current or future drug candidates, if approved, will achieve broad market acceptance among physicians and patients. Any failure by our
drug candidates that obtain regulatory approval to achieve market acceptance or commercial success would adversely affect our results of operations.

We rely on third-party suppliers to manufacture preclinical and clinical supplies of our drug candidates and we intend to continue to rely on third parties to produce
such preclinical and clinical supplies as well as commercial supplies of any approved product. The loss of these suppliers, or their failure to comply with applicable
regulatory requirements or to provide us with sufficient quantities at acceptable quality levels or prices, or at all,
would materially and adversely affect our business.

We do not have the infrastructure or capability internally to manufacture supplies of our drug candidates or the materials necessary to produce our drug candidates for use
in the conduct of our clinical studies, and we lack the internal resources and the capability to manufacture any of our drug candidates on a clinical or commercial scale.
The facilities used by our contract manufacturers to manufacture our drug candidates are subject to various regulatory requirements and may be subject to the inspection
of the FDA or other regulatory authorities. We do not control the manufacturing process of, and are completely dependent on, our contract manufacturing partners for
compliance  with  the  regulatory  requirements,  known  as  cGMPs.  If  our  contract  manufacturers  cannot  successfully  manufacture  material  that  conforms  to  our
specifications  and  the  strict  regulatory  requirements  of  the  FDA  or  comparable  regulatory  authorities  in  foreign  jurisdictions,  we  may  not  be  able  to  rely  on  their
manufacturing  facilities  for  the  manufacture  or  our  drug  candidates.  In  addition,  we  have  limited  control  over  the  ability  of  our  contract  manufacturers  to  maintain
adequate  quality  control,  quality  assurance  and  qualified  personnel.  If  the  FDA  or  a  comparable  foreign  regulatory  authority  finds  these  facilities  inadequate  for  the
manufacture  of  our  drug  candidates  or  if  such  facilities  are  subject  to  enforcement  action  in  the  future  or  are  otherwise  inadequate,  we  may  need  to  find  alternative
manufacturing facilities, which would significantly impact our ability to develop, obtain regulatory approval for or market our drug candidates.

We currently intend to supply all of our drug candidates in all territories for our planned clinical development programs. We currently rely on third parties at key stages in
our supply chain. For instance, the supply chains for our current drug candidates involve several manufacturers that specialize in specific operations of the manufacturing
process, specifically, raw materials manufacturing, drug substance manufacturing and drug product manufacturing. As a result, the supply chain for the manufacturing of
our  drug  candidates  is  complicated  and  we  expect  the  logistical  challenges  associated  with  our  supply  chain  to  grow  more  complex  as  our  drug  candidates  progress
through the clinical trial process. Some of these third parties may also be adversely impacted by COVID-19 or other unforeseen events and public health emergencies.
For example, one of the manufacturers in our supply chain for UBX0101 experienced a two-week shutdown in April 2020 due to a COVID-19 related incident. While
such incident did not impact our supply of UBX0101 for clinical studies being conducted in April 2020, there can be no assurance that our supply chain for any of our
candidates and clinical trials will not be disrupted in the future due to the COVID-19 pandemic.

We  do  not  have  any  control  over  the  process  or  timing  of  the  acquisition  or  manufacture  of  materials  by  our  manufacturers.  Further,  we  have  not  yet  engaged  any
manufacturers for the commercial supply of our current drug candidates. Although we intend to enter into such agreements prior to commercial launch of any of our drug
candidates, we may be unable to enter into any such agreement or do so on commercially reasonable terms, which
could have a material adverse impact upon our business. We generally do not begin a preclinical study and we do not intend to initiate any clinical studies unless we
believe we have access to a sufficient supply of a drug candidate

54

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
to  complete  such  study  or  trial.  In  addition,  any  significant  delay  in,  or  quality control  problems  with  respect  to,  the  supply  of  a  drug  candidate,  or  the  raw  material
components thereof, for an ongoing study or trial could considerably
delay completion of our preclinical studies or future clinical studies, product testing and potential regulatory approval of our drug candidates.

Moreover, if there is a disruption to one or more of our third-party manufacturers’ or suppliers’ relevant operations, or if we are unable to enter into arrangements for the
commercial supply of our drug candidates, we will have no other means of producing our current drug candidates until they restore the affected facilities or we or they
procure alternative manufacturing facilities or sources of supply. Our ability to progress our preclinical and clinical programs could be materially and adversely impacted
if any of the third-party suppliers upon which we rely were to experience a significant business challenge, disruption or failure due to issues such as financial difficulties
or bankruptcy, issues relating to other customers such as regulatory or quality compliance issues, or other financial, legal, regulatory or reputational issues.

Additionally, any damage to or destruction of our third-party manufacturers’ or suppliers’ facilities or equipment may significantly impair our ability to manufacture our
drug candidates on a timely basis.

In  addition,  to  manufacture  our  current  drug  candidates  in  the  quantities  that  we  believe  would  be  required  to  meet  anticipated  market  demand,  our  third-party
manufacturers would likely need to increase manufacturing capacity and, in some cases, we would need to secure alternative sources of commercial supply, which could
involve significant challenges and may require additional regulatory approvals. In addition, the development of commercial-scale
manufacturing capabilities may require us and our third-party manufacturers to invest substantial additional funds and hire and retain the technical personnel who have
the  necessary  manufacturing  experience.  Neither  we  nor  our  third-party  manufacturers  may  successfully  complete  any  required  increase  to  existing  manufacturing
capacity  in  a  timely  manner,  or  at  all.  If  our  manufacturers  or  we  are  unable  to  purchase  the  raw  materials  necessary  for  the  manufacture  of  our  drug  candidates  on
acceptable terms, at sufficient quality levels, or in adequate quantities, if at all, the commercial launch of our current drug candidates or any future drug candidates would
be delayed or there would be a shortage in supply, which would impair our ability to generate revenues from the sale of such drug candidates, if approved.

If we fail to attract and retain senior management and key scientific personnel, we may be unable to successfully develop our current drug candidates or any future
drug candidates, conduct our clinical studies and commercialize our current or any future drug candidates.

Our  success  depends  in  part  on  our  continued  ability  to  attract,  retain  and  motivate  highly  qualified  management,  clinical  and  scientific  personnel.  We  are  highly
dependent upon our senior management as well as our senior scientists. In March 2020, our prior Chairman and Chief Executive Officer, Keith R. Leonard, resigned
from his position as Chief Executive Officer and was replaced by Anirvan Ghosh, Ph.D. In addition, in July 2020, our prior Chief Financial Officer, Robert C. Goeltz II,
resigned from his position as Chief Financial Officer, and he was replaced by Lynne Sullivan. In addition, following the announcement of our Phase 2 clinical trial results
for UBX0101, we implemented a corporate restructuring resulting in the elimination of a significant portion of the workforce. These events have resulted in additional
loss  of  personnel,  both  planned  and  unplanned.  Continued  disruption  caused  by  the  transition  or  by  the  loss  of  ongoing  services  of  any  other  members  of  our  senior
management team or our senior scientists could delay or prevent the successful development of our product pipeline, initiation or completion of our planned clinical
studies or the commercialization of our current drug candidates or any future drug candidates.

Competition  for  qualified  personnel  in  the  biotechnology  and  pharmaceuticals  field  is  intense  due  to  the  limited  number  of  individuals  who  possess  the  skills  and
experience required by our industry. We will need to hire additional personnel as we expand our clinical development and if we initiate commercial activities. We may
not be able to attract and retain quality personnel on acceptable terms, or at all. In addition, to the extent we hire personnel
from competitors, we may be subject to allegations that they have been improperly solicited or that they have divulged proprietary or other confidential information, or
that their former employers own their research output.

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We depend on third-party suppliers for key raw materials used in our manufacturing processes, and the loss of these third-party suppliers or their inability to supply
us with adequate raw materials could harm our business.

We  rely  on  third-party  suppliers  for  the  raw  materials  required  for  the  production  of  our  drug  candidates.  Our  dependence  on  these  third-party  suppliers  and  the
challenges we may face in obtaining adequate supplies of raw materials involve several risks, including limited control over pricing, availability, and quality and delivery
schedules. As a small company, our negotiation leverage is limited, and we are likely to get lower priority than our competitors who are larger than we are. We cannot be
certain  that  our  suppliers  will  continue  to  provide  us  with  the  quantities  of  these  raw  materials  that  we  require  or  satisfy  our  anticipated  specifications  and  quality
requirements. Any supply interruption in limited or sole sourced raw materials could materially harm our ability to manufacture our drug candidates until a new source of
supply, if any, could be identified and qualified. We may be unable to find a sufficient alternative supply channel in a reasonable time or on commercially reasonable
terms.  Any  performance  failure  on  the  part  of  our  suppliers  could  delay  the  development  and  potential  commercialization  of  our  drug  candidates,  including  limiting
supplies necessary for clinical studies and regulatory approvals, which would have a material adverse effect on our business.

We rely on third parties in the conduct of critical portions of our preclinical studies and intend to rely on third parties in the conduct of critical portions of our future
clinical  studies.  If  these  third  parties  do  not  successfully  carry  out  their  contractual  duties,  fail  to  comply  with  applicable  regulatory  requirements  or  meet  expected
deadlines, we may be unable to obtain regulatory approval for our drug candidates. Some of these third parties may also be adversely
impacted by COVID-19 or other unforeseen events and public health emergencies.

We currently do not have the ability to independently conduct preclinical studies that comply with the regulatory requirements known as good laboratory practice, or
GLP, requirements. We also do not currently have the ability to independently conduct any clinical studies. The FDA and regulatory authorities in other jurisdictions
require us to comply with regulations and standards, commonly referred to as good clinical practice, or GCP, requirements for
conducting, monitoring, recording and reporting the results of clinical studies, in order to ensure that the data and results are scientifically credible and accurate and that
the  trial  subjects  are  adequately  informed  of  the  potential  risks  of  participating  in  clinical  studies.  We  rely  on  medical  institutions,  clinical  investigators,  contract
laboratories and other third parties, such as CROs, to conduct GLP-compliant preclinical studies and GCP-compliant clinical studies on our drug candidates properly and
on time. While we have agreements governing their activities, we control only certain aspects of their activities and have limited influence over their actual performance.
The third parties with whom we contract for execution of our GLP-compliant preclinical studies and our GCP-compliant clinical studies play a significant role in the
conduct of these studies and trials and the subsequent collection and analysis of data. These third parties are not our employees and, except for restrictions imposed by
our contracts with
such  third  parties,  we  have  limited  ability  to  control  the  amount  or  timing  of  resources  that  they  devote  to  our  programs.  Although  we  rely  on  these  third  parties  to
conduct  our  GLP-compliant  preclinical  studies  and  GCP-compliant  clinical  studies,  we  remain  responsible  for  ensuring  that  each  of  our  GLP  preclinical  studies  and
clinical studies is conducted in accordance with its investigational plan and protocol and applicable laws and regulations, and our reliance on the CROs does not relieve
us of our regulatory responsibilities.

Many of the third parties with whom we contract may also have relationships with other commercial entities, potentially including our competitors, for whom they may
also be conducting clinical studies or other drug development activities that could harm our competitive position. If the third parties conducting our preclinical studies or
our  clinical  studies  do  not  adequately  perform  their  contractual  duties  or  obligations,  experience  significant  business  challenges,  disruptions  or  failures,  do  not  meet
expected deadlines, terminate their agreements with us or need to be replaced, or if the quality or accuracy of the data they obtain is compromised due to their failure to
adhere to our protocols or to GCPs, or for any other reason, we may need to enter into new arrangements with alternative third parties. This could be difficult, costly or
impossible, and our preclinical studies or clinical studies may need to be extended, delayed, terminated or repeated. As a result, we may not be able to obtain regulatory
approval in a timely fashion, or at all, for the applicable drug candidate, our financial results and the commercial prospects for our drug candidates would be harmed, our
costs could increase, and our ability to generate revenues could be delayed.

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We are currently conducting and will continue to conduct preclinical trials and contract with third-party manufacturers in foreign countries, which could expose us
to risks that could have a material adverse effect on the success of our business.

We have conducted in the past and are currently conducting preclinical trials in the United States, Canada and China and contract with third-party suppliers in the United
States, China and Denmark. Accordingly, we are subject to risks associated with doing business globally, including commercial, political, and financial risks. In addition,
we are subject to potential disruption caused by military conflicts; potentially unstable governments or legal systems; civil or political upheaval or unrest; local labor
policies and conditions; possible expropriation, nationalization, or confiscation of assets; problems with repatriation of foreign earnings; economic or trade sanctions;
closure of markets to imports; anti-American sentiment; terrorism or other types of violence in or outside the United States; health pandemics; and a significant reduction
in  global  travel.  The  COVID-19  pandemic  could  disrupt  the  ability  of  our  third-party  service  providers  to  deliver  agreed  upon  services,  regardless  of  our  third-party
service provider’s physical location Our success will depend, in part, on our ability to overcome the challenges we encounter with respect to these risks and other factors
affecting U.S. companies with global operations. If our global clinical trials or foreign third-party suppliers were to experience significant disruption due to these risks or
for other reasons, it could have a material adverse effect on our business, financial condition, results of operations and prospects.

We  face  significant  competition  in  an  environment  of  rapid  technological  and  scientific  change,  and  our  drug  candidates,  if  approved,  will  face  significant
competition and our failure to effectively compete may prevent us from achieving significant market penetration. Most of our competitors have significantly greater
resources than we do, and we may not be able to successfully compete.

The  biotechnology  and  pharmaceutical  industries  in  particular  are  characterized  by  rapidly  advancing  technologies,  intense  competition  and  a  strong  emphasis  on
developing proprietary therapeutics. Numerous companies are engaged in the development, patenting, manufacturing and marketing of healthcare products competitive
with those that we are developing. We face competition from a number of sources, such as pharmaceutical companies, generic drug companies, biotechnology companies
and academic and research institutions, many of which have greater financial resources, marketing capabilities, sales forces, manufacturing capabilities, research and
development capabilities, clinical study expertise, intellectual property portfolios, experience in obtaining patents and regulatory approvals for drug candidates and other
resources than we do. Some of the companies that offer competing products also have a broad range of other product offerings, large direct sales forces and long-term
customer relationships with our target physicians, which could inhibit our market penetration efforts. Mergers and acquisitions in the pharmaceutical industry may result
in even more resources being concentrated among a smaller number of our competitors. Smaller or early-stage companies may also prove to be significant competitors,
particularly through
collaborative arrangements with large and established companies. These competitors also compete with us in
recruiting  and  retaining  qualified  scientific  and  management  personnel  and  establishing  clinical  study  sites  and  patient  registration  for  clinical  studies,  as  well  as  in
acquiring technologies complementary to, or necessary for, our programs. In addition, certain of our drug candidates, if approved, may compete with other products that
treat  diseases  of  aging,  including  over  the  counter,  or  OTC,  treatments,  for  a  share  of  some  patients’  discretionary  budgets  and  for  physicians’  attention  within  their
clinical practices.

We are aware of other companies seeking to develop treatments to prevent or treat diseases of aging through various biological pathways, including Calico. Within our
lead  senolytic  program  in  ophthalmology  diseases,  our  drug  candidates  would  compete  against  current  therapies  from  a  wide  range  of  companies  and  technologies,
including current standard of care treatments such as anti-VEGF antibodies (bevacizumab, ranibizumab, aflibercept, brolucizumab), intravitreal steroid (dexamethasone),
and  pan-retinal  photocoagulation  by  laser  E.  There  are  also  potentially  disease-modifying  therapeutics  being  developed  by  several  pharmaceutical  and  biotechnology
companies, including Roche/Genentech, Kodiak, Graybug, Ocular Therapeutix, and Regeneron.

Further, we believe that potential competitors may be able to develop senolytic medicines utilizing well-established molecules and pathways, which could enable the
development of competitive drug candidates utilizing the same cellular senescence biological theories.

Certain alternative treatments offered by competitors may be available at lower prices and may offer greater efficacy or better safety profiles. Furthermore, currently
approved products could be discovered to have application for

57

 
 
 
 
 
 
 
 
treatment  of  diseases  of  aging  generally,  which  could  give  such  products significant  regulatory  and  market  timing  advantages  over  any  of  our  drug  candidates.  Our
competitors  also  may  obtain  FDA,  EMA  or  other  regulatory approval  for  their  products  more  rapidly  than  we  may  obtain  approval  for  ours  and  may  obtain  orphan
product exclusivity from the FDA for indications our drug candidates are targeting, which could result in our competitors establishing a strong market position before we
are able to enter the market. Newly developed systemic or non-systemic treatments that replace existing therapies that currently are only utilized in patients suffering
from severe disease may also have lessened side effects or reduced prices compared to current therapies, which make them more attractive for patients suffering from
mild to moderate disease. Even if a generic or OTC product is less effective than our drug candidates, it may be more quickly adopted by physicians and patients than our
competing drug candidates based upon cost or convenience.

The successful commercialization of our drug candidates will depend in part on the extent to which governmental authorities and health insurers establish adequate
coverage, reimbursement levels and pricing policies. Failure to obtain or maintain coverage and adequate reimbursement for our drug candidates, if approved, could
limit our ability to market those products and decrease our ability to generate revenue.

The availability and adequacy of coverage and reimbursement by governmental healthcare programs such as Medicare and Medicaid, private health insurers and other
third-party  payors  are  essential  for  most  patients  to  be  able  to  afford  prescription  medications  such  as  our  drug  candidates,  assuming  FDA  approval.  Our  ability  to
achieve acceptable levels of coverage and reimbursement for products by governmental authorities, private health insurers
and other organizations will have an effect on our ability to successfully commercialize our drug candidates. Assuming we obtain coverage for our drug candidates by a
third-party payor, the resulting reimbursement payment rates may not be adequate or may require co-payments that patients find unacceptably high. We cannot be sure
that  coverage  and  reimbursement  in  the  United States,  the  EU  or  elsewhere  will  be  available  for  our  drug  candidates  or  any  product  that  we  may  develop,  and  any
reimbursement that may become available may be decreased or eliminated in the future.

Third-party payors increasingly are challenging prices charged for pharmaceutical products and services, and many third-party payors may refuse to provide coverage
and reimbursement for particular drugs or biologics when an equivalent generic drug, biosimilar or a less expensive therapy is available. It is possible that a third-party
payor  may  consider  our  drug  candidates  as  substitutable  and  only  offer  to  reimburse  patients  for  the  cost  of  the  less  expensive  product.  Even  if  we  show  improved
efficacy or improved convenience of administration with our drug candidates, pricing of existing third-party therapeutics may limit the amount we will be able to charge
for our drug candidates. These payors may deny or revoke the reimbursement status of a given product or establish prices for new or existing marketed products at levels
that are too low to enable us to realize an appropriate return on our investment in our drug candidates. If reimbursement is not available or is available only at limited
levels,  we  may  not  be  able  to  successfully  commercialize  our  drug  candidates  and  may  not  be  able  to  obtain  a  satisfactory  financial  return  on  our  investment  in  the
development of drug candidates.

There  is  significant  uncertainty  related  to  the  insurance  coverage  and  reimbursement  of  newly  approved  products.  In  the  United States,  third-party  payors,  including
private and governmental payors, such as the Medicare and Medicaid programs, play an important role in determining the extent to which new drugs and biologics will
be covered. The Medicare and Medicaid programs increasingly are used as models in the United States for how private payors and other governmental payors develop
their coverage and reimbursement policies for drugs and biologics. Some third-party payors may require pre-approval of coverage for new or innovative devices or drug
therapies before they will reimburse healthcare providers who use such therapies. We cannot predict at this time what third-party payors will decide with respect to the
coverage and reimbursement for our drug candidates.

No  uniform  policy  for  coverage  and  reimbursement  for  products  exists  among  third-party  payors  in  the  United  States.  Therefore,  coverage  and  reimbursement  for
products can differ significantly from payor to payor. As a result, the coverage determination process is often a time-consuming and costly process that will require us to
provide scientific and clinical support for the use of our drug candidates to each payor separately, with no assurance that coverage and adequate reimbursement will be
applied consistently or obtained in the first instance. Furthermore, rules and regulations regarding reimbursement change frequently, in some cases on short notice, and
we believe that changes in these rules and regulations are likely.

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Outside  the  United  States,  international  operations  are  generally  subject  to  extensive  governmental  price  controls  and  other  market  regulations,  and  we  believe  the
increasing emphasis on cost-containment initiatives in Europe and other countries have and will continue to put pressure on the pricing and usage of our drug candidates.
In many countries, the prices of medical products are subject to varying price control mechanisms as part of national health systems. Other countries allow companies to
fix their own prices for medical products but monitor and control company profits.

Additional  foreign  price  controls  or  other  changes  in  pricing  regulation  could  restrict  the  amount  that  we  are  able  to  charge  for  our  drug  candidates.  Accordingly,  in
markets outside the United States,  the  reimbursement  for  our  drug  candidates  may  be  reduced  compared  with  the  United States  and  may  be  insufficient  to  generate
commercially reasonable revenue and profits.

Moreover, increasing efforts by governmental and third-party payors in the United States and abroad to cap or reduce healthcare costs may cause such organizations to
limit  both  coverage  and  the  level  of  reimbursement  for  newly  approved  products  and,  as  a  result,  they  may  not  cover  or  provide  adequate  payment  for  our  drug
candidates. We expect to experience pricing pressures in connection with the sale of our drug candidates due to the trend toward managed health care, the increasing
influence of health maintenance organizations and additional legislative changes. The downward pressure on healthcare costs in general, particularly prescription drugs
and biologics and surgical procedures and other treatments, has become intense. As a result, increasingly high barriers are being erected to the entry of new products.

We currently have no sales organization. If we are unable to establish sales capabilities on our own or through third parties, we may not be able to market and sell
our drug candidates effectively in the U.S. and foreign jurisdictions, if approved, or generate product revenue.

We currently do not have a marketing or sales organization. In order to commercialize our drug candidates in the United States and foreign jurisdictions, we must build
our marketing, sales, distribution, managerial and other non-technical capabilities or make arrangements with third parties to perform these services, and we may not be
successful in doing so. If any of our drug candidates receive regulatory approval, we expect to establish a sales organization with technical expertise and supporting
distribution capabilities to commercialize each such drug candidate, which will be expensive and time consuming. We have no prior experience in the marketing, sale
and distribution of pharmaceutical products and there are significant risks involved in building and managing a sales organization, including our ability to hire, retain,
and incentivize qualified individuals, generate sufficient sales leads, provide adequate training to sales and marketing personnel, and effectively manage a geographically
dispersed sales and marketing team. Any failure or delay in the development of our internal sales, marketing and distribution capabilities would adversely impact the
commercialization of these products. We may choose to collaborate with third parties that have direct sales forces and established distribution systems, either to augment
our own sales force and distribution systems or in lieu of our own sales force and distribution systems. If we are unable to enter into such arrangements on acceptable
terms or at all, we may not be able to successfully commercialize our drug candidates. If we are not successful in commercializing our drug candidates or any future drug
candidates, either on our own or through arrangements with one or more third parties, we may not be able to generate any future product revenue and we would incur
significant additional losses.

We will need to increase the size of our organization, and we may experience difficulties in managing growth.

As  of  December  31,  2020,  we  had  61  full-time  employees.  We  will  need  to  continue  to  expand  our  managerial,  operational,  finance  and  other  resources  in  order  to
manage  our  operations  and  clinical  studies,  continue  our  development  activities  and  commercialize  our  current  drug  candidates  or  any  future  drug  candidates.  Our
management  and  personnel,  systems  and  facilities  currently  in  place  may  not  be  adequate  to  support  this  future  growth.  Our  need  to  effectively  execute  our  growth
strategy requires that we:

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manage our clinical studies effectively;

identify, recruit, retain, incentivize and integrate additional employees, including sales personnel;

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manage our internal research, development and operational efforts effectively while carrying out our contractual obligations to third parties; and

continue to improve our operational, financial and management controls, reports systems and procedures.

If product liability lawsuits are brought against us, we may incur substantial liabilities and may be required to limit commercialization of our current or future drug
candidates.

We face an inherent risk of product liability as a result of the clinical testing of our drug candidates and will face an even greater risk if we commercialize any products.
For example, we may be sued if any product we develop allegedly causes injury or is found to be otherwise unsuitable during product testing, manufacturing, marketing
or sale. Any such product liability claims may include allegations of defects in manufacturing, defects in design, and a failure to warn of dangers inherent in the product,
negligence,  strict  liability,  and  a  breach  of  warranty.  Claims  could  also  be  asserted  under  state  consumer  protection  acts.  If  we  cannot  successfully  defend  ourselves
against product liability claims, we may incur substantial liabilities or be required to limit commercialization of our drug candidates.

Even a successful defense would require significant financial and management resources. Regardless of the merits or eventual outcome, liability claims may result in:

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decreased demand for our current or future drug candidates;

injury to our reputation;

withdrawal of clinical study participants;

costs to defend the related litigation;

a diversion of management’s time and our resources;

substantial monetary awards to trial participants or patients;

regulatory investigations, product recalls, withdrawals or labeling, marketing or promotional restrictions;

loss of revenue; and

the inability to commercialize our current or any future drug candidates.

Our inability to obtain and maintain sufficient product liability insurance at an acceptable cost and scope of coverage to protect against potential product liability claims
could  prevent  or  inhibit  the  commercialization  of  our  current  or  any  future  drug  candidates  we  develop.  We  currently  carry  product  liability  insurance  covering  our
clinical studies. Although we maintain such insurance, any claim that may be brought against us could result in a court judgment or
settlement in an amount that is not covered, in whole or in part, by our insurance or that is in excess of the limits of our insurance coverage. Our insurance policies also
have various exclusions and deductibles, and we may be subject to a product liability claim for which we have no coverage. We will have to pay any amounts awarded
by a court or negotiated in a settlement that exceed our coverage limitations or that are not covered by our insurance, and we may not have, or be able to obtain, sufficient
funds to pay such amounts. Moreover, in the future, we may not be able to
maintain insurance coverage at a reasonable cost or in sufficient amounts to protect us against losses. If and when we obtain approval for marketing any of our drug
candidates,  we  intend  to  expand  our  insurance  coverage  to  include  the  sale  of  such  drug  candidate;  however,  we  may  be  unable  to  obtain  this  liability  insurance  on
commercially reasonable terms or at all.

Our existing collaborations as well as additional collaboration arrangements that we may enter into in the future may not be successful, which could adversely affect
our ability to develop and commercialize our drug candidates.

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We utilize external collaborations and currently maintain approximately five active early-stage research and discovery focused collaborations. In the future, we may seek
additional  collaboration  arrangements  for  the  commercialization,  or  potentially  for  the  development,  of  certain  of  our  drug  candidates  depending  on  the  merits  of
retaining  commercialization  rights  for  ourselves  as  compared  to  entering  into  collaboration  arrangements.  To  the  extent  that  we  decide  to  enter  into  additional
collaboration agreements in the future, we may face significant competition in seeking appropriate collaborators. Moreover, collaboration arrangements are complex and
time-consuming to negotiate, document, implement and maintain and challenging to manage. We may not be successful in our efforts to prudently manage our existing
collaborations or to enter new ones should we chose to do so. The terms of new collaborations, or other arrangements that we may establish may not be favorable to us.

The success of our collaboration arrangements will depend heavily on the efforts and activities of our collaborators and partners. Collaborations are subject to numerous
risks, which may include risks that:

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collaborators and partners have significant discretion in determining the efforts and resources that they will apply to collaborations and they may not devote
the level of effort or resources we expect;

collaborators  may  not  pursue  development  and  commercialization  of  our  drug  candidates  or  may  elect  not  to  continue  or  renew  development  or
commercialization programs based on clinical study results, changes in their strategic focus due to their acquisition of competitive products or their internal
development  of  competitive  products,  availability  of  funding  or  other  external  factors,  such  as  a  business  combination  that  diverts  resources  or  creates
competing priorities;

collaborators may delay clinical studies, provide insufficient funding for a clinical study program, stop a clinical study, abandon a drug candidate, repeat or
conduct new clinical studies or require a new formulation of a drug candidate for clinical testing;

collaborators could independently develop, or develop with third parties, products that compete directly or indirectly with our products or drug candidates;

a collaborator with marketing, manufacturing and distribution rights to one or more products may not commit sufficient resources to or otherwise not perform
satisfactorily in carrying out these activities;

we could grant exclusive rights to our collaborators that would prevent us from collaborating with others;

collaborators may not properly maintain or defend our intellectual property rights or may use our intellectual property or proprietary information in a way
that gives rise to actual or threatened litigation that could jeopardize or invalidate our intellectual property or proprietary information or expose us to potential
liability;

disputes may arise between us and a collaborator that cause the delay or termination of the research, development or commercialization of our current or
future drug candidates or that result in costly litigation or arbitration that diverts management attention and resources;

collaborations may be terminated, resulting in a need for additional capital to pursue further development or commercialization of the applicable current or
future drug candidates;

collaborators may own or co-own intellectual property covering products that results from our collaborating with them, and in such cases, we would not have
the exclusive right to develop or commercialize such intellectual property;

disputes may arise with respect to the ownership of any intellectual property developed pursuant to our collaborations;

a collaborator’s sales and marketing activities or other operations may not be in compliance with applicable laws resulting in civil or criminal proceedings;
and

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collaborators may be adversely impacted by COVID-19 or other unforeseen events and public health emergencies.

Unfavorable global economic or political conditions could adversely affect our business, financial condition or results of operations.

Our  results  of  operations  could  be  adversely  affected  by  general  conditions  in  the  global  economy  and  in  the  global  financial  markets.  Furthermore,  the  market  for
products  with  the  potential  to  treat  diseases  of  aging,  particularly  those  affecting  large  populations  in  a  wide  range  of  geographic  locations,  may  be  particularly
vulnerable to unfavorable economic conditions. A global financial crisis or a global or regional political disruption, including most recently as a result of the COVID-19
pandemic, have caused and could continue to cause extreme volatility in the capital and credit markets. A severe or prolonged economic downturn or political disruption
could result in a variety of risks to our business, including weakened demand for our current drug candidates or any future drug candidates, if approved, and our ability to
raise additional capital when needed on acceptable terms, if at all. A weak or declining economy or political disruption could also strain our manufacturers or suppliers,
possibly resulting in supply disruption, or cause our customers to delay making payments for our services. Weakened or declining economic conditions could be caused
by a number of factors. Any of the foregoing could harm our business and we cannot anticipate all of the ways in which the political or economic climate and financial
market conditions could adversely impact our business.

Risks Related to Intellectual Property

Our  senolytic  medicine  platform  and  any  future  products  that  we  commercialize  could  be  alleged  to  infringe  patent  rights  and  other  proprietary  rights  of  third
parties, which may require costly litigation and, if we are not successful, could cause us to pay substantial damages and/or limit our ability to commercialize our
products.

Our  commercial  success  depends  on  our  ability  to  develop,  manufacture  and  market  our  senolytic  medicines  and  future  drug  candidates  and  use  our  proprietary
technology without infringing the patents and other proprietary rights of third parties. Intellectual property disputes can be costly to defend and may cause our business,
operating results and financial condition to suffer. We operate in an industry with extensive intellectual property litigation. As the
biopharmaceutical and pharmaceutical industries expand and more patents are issued, the risk increases that there may be patents issued to third parties that relate to our
products and technology of which we are not aware or that we may need to challenge to continue our operations as currently contemplated.

Whether  merited  or  not,  we  may  face  allegations  that  we  have  infringed  the  trademarks,  copyrights,  patents  and  other  intellectual  property  rights  of  third  parties,
including patents held by our competitors or by non-practicing entities. We may also face allegations that our employees have misappropriated the intellectual property
rights of their former employers or other third parties.

Litigation may make it necessary to defend ourselves by determining the scope, enforceability and validity of third-party proprietary rights, or to establish our proprietary
rights. Regardless of whether claims that we are infringing patents or other intellectual property rights have merit, the claims can be time consuming, divert management
attention and financial resources and are costly to evaluate and defend. Results of any such litigation are difficult to predict and may require us to stop treating certain
conditions, obtain licenses or modify our products and features while we develop non-infringing substitutes, or may result in significant settlement costs. For example,
litigation can involve substantial damages for infringement (and if the court finds that the infringement was willful, we could be ordered to pay treble damages and the
patent owner’s attorneys’ fees), and the court could prohibit us from selling or
licensing our products unless the third party licenses rights to us, which it is not required to do at a commercially reasonable price or at all. If a license is available from a
third party, we may have to pay substantial royalties, upfront fees or grant cross-licenses to intellectual property rights for our products. We may also have to redesign our
products so they do not infringe third-party intellectual property rights, which may not be possible at all or may require substantial monetary expenditures and time,
during which our products may not be available for manufacture, use, or sale.

In addition, patent applications in the United States and many international jurisdictions are typically not published until 18 months after the filing of certain priority
documents (or, in some cases, are not published until they issue as

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patents) and publications in the scientific literature often lag behind actual discoveries. Thus, we cannot be certain that others have not filed patent applications or made
public disclosures relating to our technology or our contemplated technology. A third party may have filed, and may in the future file, patent applications covering our
products or technology similar to ours. Any such patent application may have priority over our patent applications or patents, which could further require us to obtain
rights to issued patents covering such technologies. If another party has filed a U.S. patent application on inventions similar to ours, depending on whether the timing of
the  filing  date  falls  under certain  patent  laws,  we  may  have  to  participate  in  a  priority  contest  (such  as  an  interference  proceeding)  declared  by  the  U.S.  Patent  and
Trademark Office, to determine priority of invention in the United States. The costs of patent and other proceedings could be substantial, and it is possible that such
efforts would be unsuccessful if it is determined that the other party had independently arrived at the same or similar invention prior to our own invention, resulting in a
loss of our U.S. patent position with respect to such inventions

From  time  to  time,  we  may  be  subject  to  legal  proceedings  and  claims  in  the  ordinary  course  of  business  with  respect  to  intellectual  property.  Although  we  are  not
currently  subject  to  any  claims  from  third  parties  asserting  infringement  of  their  intellectual  property  rights,  in  the  future,  we  may  receive  claims  from  third  parties
asserting  infringement  of  their  intellectual  property  rights.  Future  litigation  may  be  necessary  to  establish  our  intellectual  property  rights  or  to  defend  ourselves  by
determining the scope, enforceability and validity of third-party intellectual property rights. There can be no assurance with respect to the outcome of any current or
future litigation brought by or against us, and the outcome of any such litigation could have a material adverse impact on our business, operating results and financial
condition.  Litigation  is  inherently  unpredictable  and  outcomes  are  uncertain.  Further,  as  the  costs  and  outcome  of  these  types  of  claims  and  proceedings  can  vary
significantly, it is difficult to estimate potential losses that may occur. Accordingly, we are unable at this time to estimate the effects of these potential future lawsuits on
our financial condition, operations or cash flows.

Some of our competitors may be able to sustain the costs of complex patent litigation more effectively than we can because they have substantially greater resources.
Even if resolved in our favor, litigation or other legal proceedings relating to intellectual property claims may cause us to incur significant expenses and could distract our
technical and management personnel from their normal responsibilities. In addition, there could be public announcements of the results of hearings, motions or other
interim proceedings or developments, and if securities analysts or investors perceive these results to be negative, it could have a material adverse effect on the price of
our common stock. Finally, any uncertainties resulting from the initiation and continuation of any litigation could have a material adverse effect on our ability to raise the
funds necessary to continue our operations.

If we are unable to obtain, maintain and enforce intellectual property protection directed to our senolytic medicine platform and any future technologies that we
develop, others may be able to make, use, or sell products substantially the same as ours, which could adversely affect our ability to compete in the market.

As of March 1, 2021, we own, co-own, or have an exclusive license in certain fields of use to more than 150 patents and pending applications in the United States and
foreign  jurisdictions.  This  portfolio  includes  43  issued  and  allowed  U.S.  patents  and  applications  and  32  granted  and  allowed  foreign  patents  and  applications,
respectively.

We have not pursued or maintained, and may not pursue or maintain in the future, patent protection for our products in every country or territory in which we may sell
our products. In addition, we cannot be sure that any of our pending patent applications or pending trademark applications will issue or that, if issued, they will issue in a
form that will be advantageous to us. The U.S. Patent and Trademark Office, or the USPTO, international patent offices or judicial bodies may deny or significantly
narrow claims made under our patent applications and our issued patents may be successfully challenged, may be designed around, or may otherwise be of insufficient
scope  to  provide  us  with  protection  for  our  commercial  products.  Further,  the  USPTO,  international  trademark  offices  or  judicial  bodies  may  deny  our  trademark
applications and, even if published or registered, these trademarks may not effectively protect our brand and goodwill. Like patents, trademarks also may be successfully
opposed or challenged.

We cannot be certain that the steps we have taken will prevent unauthorized use or unauthorized reverse engineering of our technology. Moreover, third parties may
independently develop technologies that are competitive with ours and such competitive technologies may or may not infringe our intellectual property. The enforcement
of our intellectual property rights also depends on the success of our legal actions against these infringers in the respective

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country  or  forum,  but  these  actions  may  not  be  successful.  As  with  all  granted  intellectual  property,  such  intellectual  property  may  be  challenged,  invalidated  or
circumvented, may not provide specific protection and/or may not prove to be enforceable in actions against specific alleged infringers.

The market for biopharmaceuticals, pharmaceuticals and treatments for diseases of aging is highly competitive and subject to rapid technological change. Our success
depends, in part, upon our ability to maintain a competitive position in the development and protection of technologies and products for use in these fields and upon our
ability to obtain, maintain and enforce our intellectual property rights in connection therewith. We seek to obtain and maintain patents and other intellectual property
rights to restrict the ability of others to market products that misappropriate our technology and/or infringe our intellectual property to unfairly and illegally compete with
our products. If we are unable to protect our intellectual property and proprietary rights, our competitive position and our business could be harmed, as third parties may
be able to make, use, or sell products that are substantially the same as ours without incurring the sizeable development and licensing costs that we have incurred, which
would adversely affect our ability to compete in the market.

We use a combination of patents, trademarks, know-how, confidentiality procedures and contractual provisions to protect our proprietary technology. However, these
protections may not be adequate and may not provide us with any competitive advantage. For example, patents may not issue from any of our currently pending or any
future patent applications, and our issued patents and any future patents that may issue may not survive legal challenges to
their scope, validity or enforceability, or provide significant protection for us.

If we or one of our current or future collaborators were to initiate legal proceedings against a third party to enforce a patent covering one of our current drug candidates
or  future  drug  candidates,  the  defendant  could  counterclaim  that  our  patent  is  invalid  and/or  unenforceable.  In  patent  litigation  in  the  United  States,  defendant
counterclaims alleging invalidity and/or unenforceability are commonplace.

Grounds  for  a  validity  challenge  could  be  an  alleged  failure  to  meet  any  of  several  statutory  requirements,  including  lack  of  novelty,  obviousness  or  nonenablement.
Grounds for an unenforceability assertion could be an allegation that someone connected with prosecution of the patent withheld relevant information from the USPTO,
or made a misleading statement, during prosecution. Third parties may also raise similar claims before the USPTO, even outside the context of litigation. The outcome
following legal assertions of invalidity and unenforceability is unpredictable.

With respect to the validity question, for example, we cannot be certain that there is no invalidating prior art, of which we and the patent examiner were unaware during
prosecution. If a defendant were to prevail on a legal assertion of invalidity and/or unenforceability, we would lose at least part, and perhaps all, of the patent protection
on our drug candidates. Such a loss of patent protection would have a material adverse impact on our business.

Even if our patents are determined by a court to be valid and enforceable, they may not be interpreted sufficiently broadly to prevent others from marketing products
similar to ours or designing around our patents. For example, third parties may be able to make products that are similar to ours but that are not covered by the claims of
our patents. Third parties may assert that we or our licensors were not the first to make the inventions covered by our issued patents or pending patent applications. The
claims of our issued patents or patent applications when issued may not cover our proposed commercial technologies or the future products that we develop. We may not
have freedom to commercialize unimpeded by the patent rights of others. Third parties may have dominating, blocking, or other patents relevant to our technology of
which we are not aware. There may be prior public disclosures or art that
could be deemed to invalidate one or more of our patent claims. Further, we may not develop additional proprietary technologies in the future, and, if we do, they may
not be patentable.

Patent law can be highly uncertain and involve complex legal and factual questions for which important principles remain unresolved. In the United States and in many
international  jurisdictions,  policy  regarding  the  breadth  of  claims  allowed  in  patents  can  be  inconsistent.  The  U.S.  Supreme  Court  and  the  Court  of  Appeals  for  the
Federal Circuit have made, and will likely continue to make, changes in how the patent laws of the United States are interpreted. Similarly, international courts have
made,  and  will  likely  continue  to  make,  changes  in  how  the  patent  laws  in  their  respective  jurisdictions  are  interpreted.  We  cannot  predict  future  changes  in  the
interpretation of patent laws or changes to patent laws that might be enacted into law by U.S. and international legislative bodies. Those

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changes may materially affect our patents, our ability to obtain patents or the patents and patent applications of our licensors. Patent  reform  legislation  in  the  United
States  could  increase  the  uncertainties  and  costs  surrounding  the  prosecution  of  our  patent  applications  and  the  enforcement  or  defense  of  our  issued  patents.  For
example,  on  September  16,  2011,  the  Leahy-Smith  America  Invents  Act,  or  Leahy-Smith  Act,  was  signed  into  law.  The  Leahy-Smith  Act  included  a  number  of
significant changes to U.S. patent law. These include provisions that affect the way patent applications are prosecuted, redefine prior art, may affect patent litigation, and
switch the U.S. patent system from a “first-to-invent” system to a “first-to-file” system. Under a “first-to-file” system, assuming the other requirements for patentability
are  met,  the  first  inventor  to  file  a  patent  application  generally  will  be  entitled  to  the  patent  on  an  invention  regardless  of  whether  another  inventor  had  made  the
invention earlier. The U.S. Patent and Trademark Office recently developed new regulations and procedures to govern administration of the Leahy-Smith Act, and many
of the substantive changes to patent law associated with the Leahy-Smith Act, and in particular, the first-to-file provisions, only became effective on March 16, 2013. The
Leahy-Smith Act and its implementation could increase the uncertainties and costs surrounding the prosecution of our patent applications and the enforcement or defense
of our issued patents, which could have a material adverse effect on our business and financial condition.

In addition, we have a number of international patents and patent applications and expect to continue to pursue patent protection in many of the significant markets in
which we intend to do business. The laws of some international jurisdictions may not protect intellectual property rights to the same extent as laws in the United States,
and  many  companies  have  encountered  significant  difficulties  in  obtaining,  protecting,  and  defending  such  rights  in  international  jurisdictions.  If  we  encounter  such
difficulties  or  we  are  otherwise  precluded  from  effectively  protecting  our  intellectual  property  rights  in  international  jurisdictions,  our  business  prospects  could  be
substantially harmed.

Varying filing dates in international countries may also permit intervening third parties to allege priority to certain technology.

Patent  terms  may  be  shortened  or  lengthened  by,  for  example,  terminal  disclaimers,  patent  term  adjustments,  supplemental  protection  certificates,  and  patent  term
extensions. Patent term extensions and supplemental protection certificates, and the like, may be impacted by the regulatory process and may not significantly lengthen
the patent term. Non-payment or delay in payment of patent fees or annuities, delay in patent filings or delay in extension
filing  (including  any  patent  term  extension  or  adjustment  filing),  whether  intentional  or  unintentional,  may  also  result  in  the  loss  of  patent  rights  important  to  our
business. Certain countries have compulsory licensing laws under which a patent owner may be compelled to grant licenses to other parties. In addition, many countries
limit the enforceability of patents against other parties, including government agencies or government contractors. In these
countries, the patent owner may have limited remedies, which could materially diminish the value of any patents.

In  addition  to  the  protection  afforded  by  patents,  we  rely  on  confidentiality  agreements  to  protect  confidential  information  and  proprietary  know-how  that  is  not
patentable or that we elect not to patent, processes for which patents are difficult to enforce and any other elements of our drug candidate discovery and development
processes that involve proprietary know-how, information or technology that is not covered by patents. We seek to protect our proprietary technology and processes, in
part, by entering into confidentiality agreements with our employees, consultants, scientific advisors and contractors. We cannot guarantee that we have entered into such
agreements  with  each  party  that  may  have  or  have  had  access  to  our  confidential  information  or  proprietary  technology  and  processes.  We  also  seek  to  preserve  the
integrity and confidentiality of our data and other confidential information by maintaining physical security of our premises and physical and electronic security of our
information  technology  systems.  While  we  have  confidence  in  these  individuals,  organizations  and  systems,  agreements  or  security  measures  may  be  breached  and
detecting the disclosure or misappropriation of confidential information and enforcing a claim that a party illegally disclosed or misappropriated confidential information
is difficult, expensive and time-consuming, and the outcome is unpredictable. Further, we may not be able to obtain adequate remedies for any breach. In addition, our
confidential information may otherwise become known or be independently discovered by competitors, in which case we would have no right to prevent them, or those
to  whom  they  communicate  it,  from  using  that  technology  or  information  to  compete  with  us.  We  may  in  the  future  rely  on  trade  secret  protection,  which  would  be
subject to the risks identified above with respect to confidential information.

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Monitoring unauthorized use of our intellectual property is difficult and costly. From time to time, we review our competitors’ products, and may in the future seek to
enforce our patents or other rights against potential infringement. However, the steps we have taken to protect our proprietary rights may not be adequate to prevent
misappropriation of our intellectual property. We may not be able to detect unauthorized use of, or take appropriate steps to enforce, our intellectual property rights. Our
competitors  may  also  independently  develop  similar  technology.  Any  inability  to  meaningfully  protect  our  intellectual  property  could  result  in  competitors  offering
products that incorporate our product or service features, which could reduce demand for our products. In addition, we may need to defend our patents from third-party
challenges, such as (but not limited to) interferences, derivation proceedings, reexamination proceedings, post-grant review, inter partes review, third-party submissions,
oppositions, nullity actions or other patent proceedings. We may need to initiate infringement claims or litigation.

Adverse proceedings such as litigation can be expensive, time consuming and may divert the efforts of our technical and managerial personnel, which could in turn harm
our business, whether or not we receive a determination favorable to us. In addition, in an infringement proceeding, a court or other judicial body may decide that the
patent we seek to enforce is invalid or unenforceable, or may refuse to stop the other party from using the technology at
issue on the grounds that the patent in question does not cover the technology in question. An adverse result in any litigation could put one or more of our patents at risk
of being invalidated or interpreted narrowly. Some of our competitors may be able to devote significantly more resources to intellectual property litigation and may have
significantly broader patent portfolios to assert against us if we assert our rights against them. Further, because of the substantial discovery required in connection with
intellectual property litigation, there is a risk that some of our confidential information could be disclosed or otherwise compromised during litigation.

We may not be able to correctly estimate or control our future operating expenses in relation to obtaining intellectual property, enforcing intellectual property and/or
defending intellectual property, which could affect operating expenses. Our operating expenses may fluctuate significantly in the future as a result of a variety of factors,
including the costs of preparing, filing, prosecuting, defending, and enforcing patent and trademark claims and other
intellectual property-related costs, including adverse proceedings (such as litigation) costs.

Our intellectual property agreements with third parties may be subject to disagreements over contract interpretation, which could narrow the scope of our rights to
the relevant intellectual property or technology or increase our financial or other obligations to our licensors.

Certain provisions in our intellectual property agreements may be susceptible to multiple interpretations. The resolution of any contract interpretation disagreement that
may arise could affect the scope of our rights to the relevant intellectual property or technology, or affect financial or other obligations under the relevant agreement,
either of which could have a material adverse effect on our business, financial condition, results of operations and prospects.

In addition, while it is our policy to require our employees and contractors who may be involved in the conception or development of intellectual property to execute
agreements  assigning  such  intellectual  property  to  us,  we  may  be  unsuccessful  in  executing  such  an  agreement  with  each  party  who  in  fact  conceives  or  develops
intellectual property that we regard as our own. Our assignment agreements may not be self-executing or may be breached, and we may be forced to bring claims against
third parties, or defend claims they may bring against us, to determine the ownership of what we regard as our intellectual property.

If our trademarks and trade names are not adequately protected, then we may not be able to build name recognition in our markets of interest and our business may
be adversely affected.

Our registered or unregistered trademarks or trade names may be challenged, infringed, circumvented, declared generic or conflict with third-party rights. We may not be
able to protect our rights to these trademarks and trade names, which we need to build name recognition by potential partners or customers in our markets of interest. In
addition, third parties may file first for our trademarks in certain countries. If they succeeded in registering such trademarks, and if we were not successful in challenging
such third-party rights, we may not be able to use these trademarks to market our products in those countries. In such cases, over the long term, if we are unable to
establish name recognition based on our trademarks and trade names, then our marketing abilities may be impacted.

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If we are unable to protect the confidentiality of our proprietary information and know-how, the value of our technology and products could be adversely affected.

We  may  not  be  able  to  protect  our  proprietary  information  and  technology  adequately.  Although  we  use  reasonable  efforts  to  protect  our  proprietary  information,
technology,  and  know-how,  our  employees,  consultants,  contractors  and  outside  scientific  advisors  may  unintentionally  or  willfully  disclose  our  information  to
competitors. Enforcing a claim that a third party illegally obtained and is using any of our proprietary information, technology or knowhow
is  expensive  and  time  consuming,  and  the  outcome  is  unpredictable.  In  addition,  courts  outside  the  United  States  are  sometimes  less  willing  to  protect  proprietary
information, technology, and know-how. We rely, in part, on non-disclosure and confidentiality agreements with our employees, consultants and other parties to protect
our proprietary information, technology, and know-how. These agreements may be breached and we may not have adequate remedies for any breach. Moreover, others
may independently develop similar or equivalent proprietary information, and third parties may otherwise gain access to our proprietary knowledge.

Risks Related to Government Regulation

Even if we obtain regulatory approval for a drug candidate, our products will remain subject to regulatory scrutiny.

If our drug candidates are approved, they will be subject to ongoing regulatory requirements for manufacturing, labeling, packaging, storage, advertising, promotion,
sampling,  record-keeping,  conduct  of  post-marketing  studies,  and  submission  of  safety,  efficacy,  and  other  post-market  information,  including  both  federal  and  state
requirements in the United States and requirements of comparable foreign regulatory authorities.

Manufacturers and manufacturers’ facilities are required to comply with extensive FDA and comparable foreign regulatory authority requirements, including ensuring
that quality control and manufacturing procedures conform to cGMP regulations. As such, we and our contract manufacturers will be subject to continual review and
inspections to assess compliance with cGMP and adherence to commitments made in any approved marketing application.
Accordingly,  we  and  others  with  whom  we  work  must  continue  to  expend  time,  money,  and  effort  in  all  areas  of  regulatory  compliance,  including  manufacturing,
production, and quality control.

We will have to comply with requirements concerning advertising and promotion for our products. Promotional communications with respect to prescription drugs and
biologics are subject to a variety of legal and regulatory restrictions and must be consistent with the information in the product’s approved label. As such, we may not
promote our products for indications or uses for which they do not have approval. The holder of an approved
application must submit new or supplemental applications and obtain approval for certain changes to the approved product, product labeling, or manufacturing process.
We  could  also  be  asked  to  conduct  post-marketing  clinical  studies  to  verify  the  safety  and  efficacy  of  our  products  in  general  or  in  specific  patient  subsets.  An
unsuccessful post-marketing study or failure to complete such a study could result in the withdrawal of marketing approval.

If  a  regulatory  agency  discovers  previously  unknown  problems  with  a  product,  such  as  adverse  events  of  unanticipated  severity  or  frequency,  or  problems  with  the
facility where the product is manufactured, or disagrees with the promotion, marketing or labeling of a product, such regulatory agency may impose restrictions on that
product  or  us,  including  requiring  withdrawal  of  the  product  from  the  market.  If  we  fail  to  comply  with  applicable  regulatory  requirements,  a  regulatory  agency  or
enforcement authority may, among other things:

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issue warning letters;

impose civil or criminal penalties;

suspend or withdraw regulatory approval;

suspend any of our clinical studies;

refuse to approve pending applications or supplements to approved applications submitted by us;

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•

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impose restrictions on our operations, including closing our contract manufacturers’ facilities; or

seize or detain products or require a product recall.

Any government investigation of alleged violations of law could require us to expend significant time and resources in response and could generate negative publicity.
Any failure to comply with ongoing regulatory requirements may significantly and adversely affect our ability to commercialize and generate revenue from our products.
If regulatory sanctions are applied or if regulatory approval is withdrawn, the value of our company and our operating results will be adversely affected.

Moreover, the policies of the FDA and of other regulatory authorities may change and additional government regulations may be enacted that could prevent, limit or
delay regulatory approval of our drug candidates. We cannot predict the likelihood, nature or extent of government regulation that may arise from future legislation or
administrative or executive action, either in the United States or abroad. For example, the results of the 2020 U.S. Presidential Election may impact our business and
industry.

Namely, the Trump administration took several executive actions, including the issuance of a number of Executive Orders, that could impose significant burdens on, or
otherwise  materially  delay,  the  FDA’s  ability  to  engage  in  routine  oversight  activities  such  as  implementing  statutes  through  rulemaking,  issuance  of  guidance,  and
review and approval of marketing applications. It is difficult to predict whether or how these orders will be implemented, or whether they will be rescinded and replaced
under the Biden administration. The policies and priorities of the new administration are unknown and could materially impact the regulations governing our product
candidates.  If we are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or policies, or if we are not able to maintain
regulatory compliance, we may be subject to enforcement action, and we may not achieve or sustain profitability.

If any of our small molecule drug candidates obtain regulatory approval, additional competitors could enter the market with generic versions of such drugs, which
may result in a material decline in sales of affected products.

Under the Drug Price Competition and Patent Term Restoration Act of 1984, or the Hatch-Waxman Act, a pharmaceutical manufacturer may file an abbreviated new
drug application, or ANDA, seeking approval of a generic version of an approved, small molecule innovator product. Under the Hatch-Waxman Act, a manufacturer may
also submit a new drug application, or NDA, under section 505(b)(2) of the Federal Food, Drug, and Cosmetic Act that
references the FDA’s prior approval of the small molecule innovator product. A 505(b)(2) NDA product may be for a new or improved version of the original innovator
product. The Hatch-Waxman Act also provides for certain periods of regulatory exclusivity, which preclude FDA approval (or in some circumstances, FDA filing and
review) of an ANDA or 505(b)(2) NDA. In addition to the benefits of regulatory exclusivity, an innovator NDA holder may
have  patents  claiming  the  active  ingredient,  product  formulation  or  an  approved  use  of  the  drug,  which  would  be  listed  with  the  product  in  the  FDA  publication,
“Approved Drug Products with Therapeutic Equivalence Evaluations,” known as the Orange Book. If there are patents listed in the Orange Book for a product, a generic
or 505(b)(2) applicant that seeks to market its product before expiration of the patents must include in their applications what is known as a “Paragraph IV” certification,
challenging the validity or enforceability of, or claiming non-infringement of, the listed patent or patents. Notice of the certification must be given to the patent owner
and NDA holder and if, within 45 days of receiving notice, either the patent owner or NDA holder sues for patent infringement, approval of the ANDA or 505(b)(2)
NDA is stayed for up to 30 months.

Accordingly, if any of our small molecule drug candidates, such as UBX1325, are approved, competitors could file ANDAs for generic versions of our small molecule
drug products or 505(b)(2) NDAs that reference our small molecule drug products. If there are patents listed for our small molecule drug products in the Orange Book,
those ANDAs and 505(b)(2) NDAs would be required to include a certification as to each listed patent indicating whether the ANDA applicant does or does not intend to
challenge the patent. We cannot predict which, if any, patents in our current portfolio or patents we may obtain in the future will be eligible for listing in the Orange
Book, how any generic competitor would address such patents, whether we would sue on any such patents, or the outcome of any such suit.

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We may not be successful in securing or maintaining proprietary patent protection for products and technologies we develop or license. Moreover, if any of our owned or
in-licensed patents that are listed in the Orange Book are successfully challenged by way of a Paragraph IV certification and subsequent litigation, the affected product
could immediately face generic competition and its sales would likely decline rapidly and materially.

Any biologic, or large molecule, drug candidates for which we intend to seek approval may face competition sooner than anticipated.

If  we  are  successful  in  achieving  regulatory  approval  to  commercialize  any  biologic  drug  candidate  faster  than  our  competitors,  such  drug  candidates  may  face
competition from biosimilar products. In the United States, large molecule drug candidates are regulated by the FDA as biologic products subject to approval under the
biologics license application, or BLA, pathway. The Biologics Price Competition and Innovation Act of 2009, or BPCIA, creates an abbreviated pathway for the approval
of biosimilar and interchangeable biologic products following the approval of an original BLA. The abbreviated regulatory pathway establishes legal authority for the
FDA  to  review  and  approve  biosimilar  biologics,  including  the  possible  designation  of  a  biosimilar  as  “interchangeable”  based  on  its  similarity  to  an  existing  brand
product. Under the BPCIA, an application for a biosimilar product cannot be approved by the FDA until 12 years after the original branded product was approved under
a BLA. The law is complex and is still being interpreted and implemented by the FDA. As a result, its ultimate impact, implementation, and meaning are subject to
uncertainty.

Moreover, the extent to which a biosimilar product, once approved, will be substituted for any one of our reference products in a way that is similar to traditional generic
substitution  for  non-biologic  products  is  not  yet  clear,  and  will  depend  on  a  number  of  marketplace  and  regulatory  factors  that  are  still  developing.  In  addition,  a
competitor could decide to forego the biosimilar approval path and submit a full BLA after completing its own preclinical studies
and clinical studies. In such cases, any exclusivity to which we may be eligible under the BPCIA would not prevent the competitor from marketing its product as soon as
it is approved.

If competitors are able to obtain marketing approval for biosimilars referencing our large molecule drug candidates, if approved, such products may become subject to
competition from such biosimilars, with the attendant competitive pressure and potential adverse consequences. Such competitive products may be able to immediately
compete with us in each indication for which our drug candidates may have received approval.

We may seek orphan drug designation for certain future drug candidates, but we may be unable to obtain such designations or to maintain the benefits associated
with orphan drug designation, including market exclusivity, which may cause our revenue, if any, to be reduced.

We may pursue orphan drug designation for certain of our future drug candidates. Under the Orphan Drug Act, the FDA may designate a drug or biologic product as an
orphan drug if it is intended to treat a rare disease or condition, defined as a patient population of fewer than 200,000 in the United States, or a patient population greater
than 200,000 in the United States where there is no reasonable expectation that the cost of developing the drug will be recovered from sales in the United State. In the
European  Union,  the  EMA’s  Committee  for  Orphan  Medicinal  Products,  or  COMP,  grants  orphan  drug  designation  to  promote  the  development  of  products  that  are
intended  for  the  diagnosis,  prevention,  or  treatment  of  a  life-threatening  or  chronically  debilitating  condition  affecting  not  more  than  five  in  10,000  persons  in  the
European  Union.  Additionally,  designation  is  granted  for  products  intended  for  the  diagnosis,  prevention,  or  treatment  of  a  life-threatening,  seriously  debilitating  or
serious and chronic condition when, without incentives, it is unlikely that sales of the drug in the European Union would be sufficient to justify the necessary investment
in developing the drug or biological product or where there is no satisfactory method of diagnosis, prevention, or treatment, or, if such a method exists, the medicine
must be of significant benefit to those affected by the condition.

In the United States, orphan drug designation entitles a party to financial incentives such as opportunities for grant funding towards clinical study costs, tax advantages,
and application fee waivers. In addition, if a product receives the first FDA approval for the indication for which it has orphan designation, the product is entitled to
orphan drug exclusivity, which means the FDA may not approve any other application to market the same drug for the same indication for a period of seven years, except
in  limited  circumstances,  such  as  a  showing  of  clinical  superiority  over  the  product  with  orphan  exclusivity  or  where  the  manufacturer  is  unable  to  assure  sufficient
product quantity for the

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orphan patient population. In the European Union, orphan drug designation entitles a party to financial incentives such as reduction of fees or fee waivers and ten years
of market exclusivity following drug or biological product approval. This period may be reduced to six years if the orphan drug designation criteria are no longer met,
including where it is shown that the product is sufficiently profitable not to justify maintenance of market exclusivity.
Even if we obtain orphan drug designation, we may not be the first to obtain marketing approval for any particular orphan indication due to the uncertainties associated
with developing pharmaceutical products. Further, even if we obtain orphan drug exclusivity for a drug candidate, that exclusivity may not effectively protect the product
from
competition because different drugs with different active moieties can be approved for the same condition. Even after an orphan drug is approved, the FDA or EMA can
subsequently approve the same drug with the same active moiety for the same condition if the FDA or EMA concludes that the later drug is clinically superior in that it is
safer, more effective, or makes a major contribution to patient care. Orphan drug designation neither shortens the
development time or regulatory review time of a drug or biologic nor gives the drug or biologic any advantage in the regulatory review or approval process.

Enacted and future healthcare legislation may increase the difficulty and cost for us to obtain marketing approval of and commercialize our drug candidates and
may affect the prices we may set.

In  the  United  States,  the  EU  and  other  jurisdictions,  there  have  been,  and  we  expect  there  will  continue  to  be,  a  number  of  legislative  and  regulatory  changes  and
proposed changes to the healthcare system that could affect our future results of operations. In particular, there have been and continue to be a number of initiatives at the
U.S. federal and state levels that seek to reduce healthcare costs and improve the quality of healthcare. For example, in March 2010, the Patient Protection and ACA, as
amended by the Health Care and Education Reconciliation Act, or collectively the Affordable Care Act, was enacted, which substantially changed the way healthcare is
financed by both governmental and private insurers. Among the provisions of the ACA, those of greatest importance to the pharmaceutical and biotechnology industries
include the following:

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an annual, non-deductible fee payable by any entity that manufactures or imports certain branded prescription drugs and biologic agents (other than those
designated as orphan drugs), which is apportioned among these entities according to their market share in certain government healthcare programs;

a  new  Medicare  Part  D  coverage  gap  discount  program,  in  which  manufacturers  must  agree  to  offer  70%  point-of-sale  discounts  off  negotiated  prices  of
applicable brand drugs to eligible beneficiaries during their coverage gap period, as a condition for the manufacturer’s outpatient drugs to be covered under
Medicare Part D;

an  increase  in  the  statutory  minimum  rebates  a  manufacturer  must  pay  under  the  Medicaid  Drug  Rebate  Program  to  23.1%  and  13.0%  of  the  average
manufacturer price for branded and generic drugs, respectively;

a new methodology by which rebates owed by manufacturers under the Medicaid Drug Rebate Program are calculated for drugs that are inhaled, infused,
instilled, implanted or injected;

extension of a manufacturer’s Medicaid rebate liability to covered drugs dispensed to individuals who are enrolled in Medicaid managed care organizations;

expansion of eligibility criteria for Medicaid programs by, among other things, allowing states to offer Medicaid coverage to certain individuals with income
at or below 133% of the federal poverty level, thereby potentially increasing a manufacturer’s Medicaid rebate liability;

a new Patient-Centered Outcomes Research Institute to oversee, identify priorities in, and conduct comparative clinical effectiveness research, along with
funding for such research;

creation  of  the  Independent  Payment  Advisory  Board,  which,  once  empaneled,  will  have  the  authority  to  recommend  certain  changes  to  the  Medicare
program that could result in reduced payments for prescription

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drugs and those recommendations could have the effect of law unless overruled by a supermajority vote of Congress; and

•

establishment of a Center for Medicare Innovation at the Centers for Medicare & Medicaid Services, or CMS, to test innovative payment and service delivery
models to lower Medicare and Medicaid spending, potentially including prescription drug spending.

Since its enactment, there have been judicial and Congressional challenges to certain aspects of the Affordable Care Act. For example, the Tax Cuts and Jobs Act of
2017, or the Tax Act, includes a provision repealing, effective January 1, 2019, the tax-based shared responsibility payment imposed by the ACA on certain individuals
who fail to maintain qualifying health coverage for all or part of a year that is commonly referred to as the “individual mandate”. Additionally, on December 14, 2018, a
U.S. District Court Judge in Texas ruled that the ACA is unconstitutional in its entirety because the “individual mandate” was repealed by Congress as part of the Tax
Act.  On  December  18,  2019,  the  U.S.  Court  of  Appeals  for  the  5th  Circuit  upheld  the  district  court’s  decision  that  the  individual  mandate  was  unconstitutional  but
remanded the case back to the District Court to determine whether the
remaining provisions of the ACA are invalid as well. The U.S. Supreme Court is currently reviewing the case, although it is unclear how the Supreme Court will rule. In
addition, there may be other efforts to challenge, repeal or replace the ACA that may impact our business or financial condition.

In  addition,  other  legislative  changes  have  been  proposed  and  adopted  in  the  United States  since  the  Affordable  Care  Act  was  enacted.  In  August  2011,  the  Budget
Control Act of 2011, among other things, led to aggregate reductions of Medicare payments to providers of 2% per fiscal year. These reductions went into effect in April
2013 and, due to subsequent legislative amendments to the statute, will remain in effect through 2030, with the exception of a temporary suspension from May 1, 2020
through March 31, 2021, unless additional action is taken by Congress. In addition, in January 2013, the American Taxpayer Relief Act of 2012 was signed into law,
which,  among  other  things,  further  reduced  Medicare  payments  to  several  types  of  providers,  including  hospitals,  imaging  centers  and  cancer  treatment  centers,  and
increased the statute of limitations period for the government to recover overpayments to providers from three to five years.

Individual states in the United States have also become increasingly aggressive in passing legislation and implementing regulations designed to control pharmaceutical
and biological product pricing, including price or patient reimbursement constraints, discounts, restrictions on certain product access and marketing cost disclosure and
transparency measures, and, in some cases, designed to encourage importation from other countries and bulk purchasing. Legally mandated price controls on payment
amounts  by  third-party  payors  or  other  restrictions  could  harm  our  business,  results  of  operations,  financial  condition  and  prospects.  In  addition,  regional  healthcare
authorities and individual hospitals are increasingly using bidding procedures to determine what pharmaceutical products and which suppliers will be included in their
prescription  drug  and  other  healthcare  programs.  This  could  reduce  the  ultimate  demand  for  our  drug  candidates  or  put  pressure  on  our  product  pricing.  Moreover,
payment  methodologies  may  be  subject  to  changes  in  healthcare  legislation  and  regulatory  initiatives.  For  example,  CMS  may  develop  new  payment  and  delivery
models, such as bundled payment models. In addition, recently there has been heightened governmental scrutiny over the manner in which manufacturers set prices for
their marketed products.

In the EU, similar political, economic and regulatory developments may affect our ability to profitably commercialize our drug candidates, if approved. In addition to
continuing pressure on prices and cost containment measures, legislative developments at the EU or member state level may result in significant additional requirements
or obstacles that may increase our operating costs. The delivery of healthcare in the EU, including the establishment and operation of health services and the pricing and
reimbursement  of  medicines,  is  almost  exclusively  a  matter  for  national,  rather  than  EU,  law  and  policy.  National  governments  and  health  service  providers  have
different  priorities  and  approaches  to  the  delivery  of  health  care  and  the  pricing  and  reimbursement  of  products  in  that  context.  In  general,  however,  the  healthcare
budgetary  constraints  in  most  EU  member  states  have  resulted  in  restrictions  on  the  pricing  and  reimbursement  of  medicines  by  relevant  health  service  providers.
Coupled with ever-increasing EU and national regulatory burdens on those wishing to develop and market products, this could prevent or delay marketing approval of
our drug candidates, restrict or regulate post-approval activities and affect our ability to commercialize our drug candidates, if approved. In markets outside of the United
States and EU, reimbursement and healthcare payment systems vary significantly by country, and many countries have instituted price ceilings on specific products and
therapies.

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We cannot predict the likelihood, nature or extent of government regulation that may arise from future legislation or administrative action in the United States, the EU or
any other jurisdiction. If we or any third parties we may engage are slow or unable to adapt to changes in existing requirements or the adoption of new requirements or
policies, or if we or such third parties are not able to maintain regulatory compliance, our drug candidates may lose any regulatory approval that may have been obtained
and we may not achieve or sustain profitability.

Our business operations and current and future relationships with investigators, healthcare professionals, consultants, third-party payors, patient organizations and
customers will be subject to applicable healthcare regulatory laws, which could expose us to penalties.

Our  business  operations  and  current  and  future  arrangements  with  investigators,  healthcare  professionals,  consultants,  third-party  payors,  patient  organizations  and
customers, may expose us to broadly applicable fraud and
abuse  and  other  healthcare  laws  and  regulations.  These  laws  may  constrain  the  business  or  financial  arrangements  and  relationships  through  which  we  conduct  our
operations, including how we research, market, sell and distribute our drug candidates, if approved.

Such laws include:

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the U.S. federal Anti-Kickback Statute, which prohibits, among other things, persons or entities from knowingly and willfully soliciting, offering, receiving
or providing any remuneration (including any kickback, bribe, or certain rebate), directly or indirectly, overtly or covertly, in cash or in kind, to induce or
reward, or in return for, either the referral of an individual for, or the purchase, lease, order or recommendation of, any good, facility, item or service, for
which payment may be made, in whole or in part, under U.S. federal and state healthcare programs such as Medicare and Medicaid. A person or entity does
not need to have actual knowledge of the statute or specific intent to violate it in order to have committed a violation;

the U.S. federal false claims and civil monetary penalties laws, including the civil False Claims Act, which, among other things, impose criminal and civil
penalties, including through civil whistleblower or qui tam actions, against individuals or entities for knowingly presenting, or causing to be presented, to the
U.S. federal government, claims for payment or approval that are false or fraudulent, knowingly making, using or causing to be made or used, a false record
or statement material to a false or fraudulent claim, or from knowingly making a false statement to avoid, decrease or conceal an obligation to pay money to
the U.S. federal government. In addition, the government may assert that a claim including items and services resulting from a violation of the U.S. federal
Anti-Kickback Statute constitutes a false or fraudulent claim for purposes of the False Claims Act;

the U.S. federal Health Insurance Portability and Accountability Act of 1996, or HIPAA, which imposes criminal and civil liability for, among other things,
knowingly  and  willfully  executing,  or  attempting  to  execute,  a  scheme  to  defraud  any  healthcare  benefit  program,  or  knowingly  and  willfully  falsifying,
concealing or covering up a material fact or making any materially false statement, in connection with the delivery of, or payment for, healthcare benefits,
items or services; similar to the U.S. federal Anti-Kickback Statute, a person or entity does not need to have actual knowledge of the statute or specific intent
to violate it in order to have committed a violation;

the FDCA, which prohibits, among other things, the adulteration or misbranding of drugs, biologics and medical devices;

the U.S. Public Health Service Act, which prohibits, among other things, the introduction into interstate commerce of a biological product unless a biologics
license is in effect for that product;

the U.S. Physician Payments Sunshine Act and its implementing regulations, which require certain manufacturers of drugs, devices, biologics and medical
supplies  that  are  reimbursable  under  Medicare,  Medicaid,  or  the  Children’s  Health  Insurance  Program  to  report  annually  to  the  government  information
related to certain payments and other transfers of value to physicians (defined to include doctors, dentists,

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optometrists, podiatrists and chiropractors), certain other healthcare providers starting in 2022, and teaching hospitals, as well as ownership and investment
interests held by the physicians described above and their immediate family members;

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analogous U.S. state laws and regulations, including: state anti-kickback and false claims laws, which may apply to our business practices, including but not
limited to, research, distribution, sales and marketing arrangements and claims involving healthcare items or services reimbursed by any third-party payor,
including private insurers; state laws that require pharmaceutical companies to comply with the pharmaceutical industry’s voluntary compliance guidelines
and the relevant compliance guidance promulgated by the U.S. federal government, or otherwise restrict payments that may be made to healthcare providers
and  other  potential  referral  sources;  and  state  laws  and  regulations  that  require  drug  manufacturers  to  file  reports  relating  to  pricing  and  marketing
information, which requires tracking gifts and other remuneration and items of value provided to healthcare professionals and entities; and

similar  healthcare  laws  and  regulations  in  the  EU  and  other  jurisdictions,  including  reporting  requirements  detailing  interactions  with  and  payments  to
healthcare providers.

Ensuring that our internal operations and future business arrangements with third parties comply with applicable healthcare laws and regulations will involve substantial
costs. It is possible that governmental authorities will conclude that our business practices do not comply with current or future statutes, regulations, agency guidance or
case law involving applicable fraud and abuse or other healthcare laws and regulations. If our operations are found to be in violation of any of the laws described above
or any other governmental laws and regulations that may apply to us, we may be subject to significant penalties, including civil, criminal and administrative penalties,
damages,  fines,  exclusion  from  government-funded  healthcare  programs,  such  as  Medicare  and  Medicaid  or  similar  programs  in  other  countries  or  jurisdictions,
disgorgement, individual imprisonment, contractual damages, reputational harm,
diminished profits and the curtailment or restructuring of our operations. Further, defending against any such actions can be costly, time-consuming and may require
significant personnel resources. Therefore, even if we are successful in defending against any such actions that may be brought against us, our business may be impaired.

U.S.  tax  legislation  and  future  changes  to  applicable  U.S.  tax  laws  and  regulations  may  have  a  material  adverse  effect  on  our  business,  financial  condition  and
results of operations.

New income, sales, use or other tax laws, statutes, rules, regulations or ordinances could be enacted at any time, or interpreted, changed, modified or applied adversely to
us, any of which could adversely affect our business operations and financial performance. We are currently unable to predict whether such changes will occur and, if so,
the  ultimate  impact  on  our  business.  To  the  extent  that  such  changes  have  a  negative  impact  on  us,  our  suppliers  or  our  customers,  including  as  a  result  of  related
uncertainty, these changes may materially and adversely impact our business, financial condition, results of operations and cash flows.

Risks Related to Ownership of Our Common Stock

Our stock price may be volatile and you may not be able to resell shares of our common stock at or above the price you paid.

The trading price of our common stock may be highly volatile and may be subject to wide fluctuations in response to various factors, some of which are beyond our
control.

These factors include those discussed in this “Risk Factors” section of this report and others such as:

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results  from,  and  any  delays  in,  commencing,  conducting  or  completing  our  clinical  studies  for  our  current  drug  candidates,  or  any  other  future  clinical
development programs;

announcements by academic or other third parties challenging the fundamental premises underlying our approach to treating diseases of aging and/or drug
development;

announcements of regulatory approval or disapproval of our current or any future drug candidates;

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failure or discontinuation of any of our research and development programs;

announcements relating to future licensing, collaboration, or development agreements;

delays in the commercialization of our current or any future drug candidates;

public misperception regarding the use of our therapies, or public bias of against “anti-aging” companies;

acquisitions and sales of new products, technologies, or businesses;

manufacturing and supply issues related to our drug candidates for clinical studies or future drug candidates for commercialization;

quarterly variations in our results of operations or those of our future competitors;

changes in earnings estimates or recommendations by securities analysts;

announcements by us or our competitors of new products, significant contracts, commercial relationships, acquisitions, or capital commitments;

developments with respect to intellectual property rights;

our commencement of, or involvement in, litigation;

changes in financial estimates or guidance, including our ability to meet our future revenue and operating profit or loss estimates or guidance;

any major changes in our board of directors or management;

new legislation in the United States relating to the sale or pricing of pharmaceuticals;

FDA or other U.S. or foreign regulatory actions affecting us or our industry;

product liability claims or other litigation or public concern about the safety of our drug candidates;

market conditions in the pharmaceutical, biopharmaceutical and biotechnology sectors; and

general economic conditions in the United States and abroad.

In  addition,  the  stock  markets  in  general,  and  the  markets  for  pharmaceutical,  biopharmaceutical,  and  biotechnology  stocks  in  particular,  have  experienced  extreme
volatility as a result of the COVID-19 pandemic that may be unrelated to the operating performance of the issuer. These broad market fluctuations may adversely affect
the  trading  price  or  liquidity  of  our  common  stock.  In  the  past,  when  the  market  price  of  a  stock  has  been  volatile,  holders  of  that  stock  have  sometimes  instituted
securities  class  action  litigation  against  the  issuer.  If  any  of  our  stockholders  were  to  bring  such  a  lawsuit  against  us,  we  could  incur  substantial  costs  defending  the
lawsuit and the attention of our management would be diverted from the operation of our business.

An active, liquid and orderly market for our common stock may not develop and may not be maintained.

Prior to our initial public offering in May 2018, there was no public market for shares of our common stock. Although our common stock is listed on the Nasdaq Global
Select Market, an active trading market for our common stock may never be sustained on the Nasdaq Global Select or any other exchange in the future. The lack of an
active market may impair your ability to sell your shares at the time you wish to sell them or at a price that you consider
reasonable.  An  inactive  market  may  also  impair  our  ability  to  raise  capital  by  selling  shares  and  may  impair  our  ability  to  acquire  other  businesses,  applications,  or
technologies using our shares as consideration.

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If securities or industry analysts do not publish research or reports about our business, or if they issue an adverse or misleading opinion regarding our stock, our
stock price and trading volume could decline.

The trading market for our common stock is influenced by the research and reports that industry or securities analysts publish about us or our business. In the event any
of  the  analysts  who  cover  us  issue  an  adverse  or  misleading  opinion  regarding  us,  our  business  model,  our  intellectual  property  or  our  stock  performance,  or  if  our
clinical studies and operating results fail to meet the expectations of analysts, our stock price would likely decline. If one or more of these analysts cease coverage of us
or fail to publish reports on us regularly, we could lose visibility in the financial markets, which in turn could cause our stock price or trading volume to decline.

We  are  an  “emerging  growth  company”  and  as  a  result  of  the  reduced  disclosure  and  governance  requirements  applicable  to  emerging  growth  companies,  our
common stock may be less attractive to investors.

We are an “emerging growth company,” as defined in the JOBS Act, and we intend to take advantage of certain exemptions from various reporting requirements that are
applicable to other public companies that are not emerging growth companies including, but not limited to, not being required to comply with the auditor attestation
requirements of Section 404, reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements, and exemptions from the
requirements of holding a nonbinding advisory vote on executive compensation and stockholder approval of any golden parachute payments not previously approved. In
addition, as an “emerging growth company” the JOBS Act allows us to delay adoption of new or revised accounting pronouncements applicable to public companies
until  such  pronouncements  are  made  applicable  to  private  companies.  We  have  elected  to  use  this  extended  transition  period  under  the  JOBS  Act.  As  a  result,  our
financial  statements  may  not  be  comparable  to  the  financial  statements  of  issuers  who  are  required  to  comply  with  the  effective  dates  for  new  or  revised  accounting
standards that are applicable to public companies, which may make comparison of our financials to those of other public companies more difficult.

We  cannot  predict  if  investors  will  find  our  common  stock  less  attractive  because  we  will  rely  on  these  exemptions.  If  some  investors  find  our  common  stock  less
attractive as a result, there may be a less active trading market for our common stock and our stock price may be more volatile. We may take advantage of these reporting
exemptions until we are no longer an emerging growth company. Even after we no longer qualify as an emerging growth company, we may still qualify as a “smaller
reporting company” which may allow us to take advantage of many of the same exemptions from disclosure requirements including not being required to comply with
the auditor attestation requirements of Section 404(b) of the Sarbanes-Oxley Act. We will remain an emerging growth company until the earlier of (1) the last day of the
year following the fifth anniversary of the consummation of our IPO, (2) the last day
of the year in which we have total annual gross revenue of at least $1.07 billion, (3) the last day of the year in which we are deemed to be a “large accelerated filer” as
defined in Rule 12b-2 under the Exchange Act, which would occur if the market value of our common stock held by non-affiliates exceeded $700.0 million as of the last
business day of the second fiscal quarter of such year or (4) the date on which we have issued more than $1.0 billion in non-convertible debt securities during the prior
three-year period.

If we sell shares of our common stock in future financings, stockholders may experience immediate dilution and, as a result, our stock price may decline.

We may from time to time issue additional shares of common stock at a discount from the current trading price of our common stock. As a result, our stockholders would
experience immediate dilution upon the purchase of any shares of our common stock sold at such discount. In addition, as opportunities present themselves, we may
enter into financing or similar arrangements in the future, including the issuance of debt securities, preferred stock or common stock. For example, on June 3, 2019, we
filed a Registration Statement on Form S-3, covering the offering of up to $250.0 million of shares of common stock, preferred stock, debt securities, warrants and units,
and entered into a sales agreement, or the June 2019 Sales Agreement, with Cowen and Company, LLC, or Cowen, to sell shares of our common stock, from time to
time, with aggregate gross sales proceeds of up to $75.0 million, through an
at-the-market equity offering program, or ATM Offering Program, under which Cowen acts as our sales agent. On July 31, 2020, we entered into the July 2020 Sales
Agreement with Cowen to sell shares of our common stock, from time to time, with aggregate gross sales proceeds of up to $50.0 million, through an additional at-the-
market equity offering program, or our Additional ATM Offering Program, under which Cowen acts as our sales agent. As of

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December 31, 2019, we had sold 3,974,908 shares of common stock under the June 2019 Sales Agreement for total net proceeds of $26.1 million. If we issue common
stock or securities convertible into common stock, our common stockholders would experience additional dilution and, as a result, our stock price may decline. During
the  year  ended  December  31,  2020,  we  issued  and  sold  5,002,257  shares  of  our  common  stock  through  our  ATM  Offering  Program  and  received  net  proceeds  of
approximately $37.3  million,  after  deducting  commissions  and  other  offering  expenses  of $1.3  million.  There  have  been  no  shares  sold  under  our  Additional  ATM
Offering Program as of December 31, 2020.

Our  principal  stockholders  and  management  own  a  significant  percentage  of  our  stock  and  will  be  able  to  exert  significant  control  over  matters  subject  to
stockholder approval

As of December 31, 2020, our executive officers, directors, holders of 5% or more of our capital stock and their respective affiliates beneficially owned approximately
48.4% of our voting stock. Therefore, these stockholders have the ability to influence us through this ownership position. These stockholders may be able to determine
all matters requiring stockholder approval. For example, these stockholders may be able to control elections of directors, amendments of our organizational documents,
or approval of any merger, sale of assets, or other major corporate transaction. This may prevent or discourage unsolicited acquisition proposals or offers for our common
stock that you may feel are in your best interest as one of our stockholders.

Sales of a substantial number of shares of our common stock in the public market could cause our stock price to fall.

Sales of a substantial number of shares of our common stock in the public market could occur at any time. These sales, or the perception in the market that the holders of
a  large  number  of  shares  intend  to  sell  shares,  could  reduce  the  market  price  of  our  common  stock.  Moreover,  holders  of  approximately  10.3  million  shares  of  our
common  stock  have  rights,  subject  to  certain  conditions,  to  require  us  to  file  registration  statements  covering  their  shares  or  to  include  their  shares  in  registration
statements that we may file for ourselves or other stockholders. We have registered and intend to continue to register all shares of common stock that we may issue under
our equity compensation plans. Once we register these shares, they can be freely sold in the public market upon issuance, subject to volume limitations applicable to
affiliates.

We incur increased costs as a result of operating as a public company, and our management devote substantial time to new compliance initiatives. We may fail to
comply with the rules that apply to public companies, including Section 404 of the Sarbanes-Oxley Act of 2002, which could result in sanctions or other penalties
that would harm our business.

We  have  incurred  and  will  continue  to  incur  significant  legal,  accounting  and  other  expenses  as  a  public  company,  including  costs  resulting  from  public  company
reporting obligations under the Exchange Act and regulations regarding corporate governance practices. The listing requirements of the Nasdaq Global Select Market and
the rules of the Securities and Exchange Commission, or SEC, require that we satisfy certain corporate governance requirements relating to director independence, filing
annual  and  interim  reports,  stockholder  meetings,  approvals  and  voting,  soliciting  proxies,  conflicts  of  interest  and  a  code  of  conduct.  Our  management  and  other
personnel  have  devoted  and  will  need  to  devote  a  substantial  amount  of  time  to  ensure  that  we  comply  with  all  of  these  requirements.  Moreover,  the  reporting
requirements, rules and regulations will increase our legal and financial compliance costs and will make some activities more time-consuming and costlier. Any changes
we make to comply with these obligations may not be sufficient to allow us to satisfy our obligations as a public company on a timely basis, or at all. These reporting
requirements, rules and regulations, coupled with the increase in potential litigation exposure associated with being a public company, could also make it more difficult
for  us  to  attract  and  retain  qualified  persons  to  serve  on  our  board  of  directors  or  board  committees  or  to  serve  as  executive  officers,  or  to  obtain  certain  types  of
insurance, including directors’ and officers’ insurance, on acceptable terms.

We  are  subject  to  Section  404  of  The  Sarbanes-Oxley  Act  of  2002,  or  Section  404,  and  the  related  rules  of  the  SEC,  which  generally  require  our  management  and
independent registered public accounting firm to report on the effectiveness of our internal control over financial reporting. Section 404 requires an annual management
assessment of the effectiveness of our internal control over financial reporting. However, for so long as we remain an emerging growth company as defined in the JOBS
Act, we intend to take advantage of certain exemptions from

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various  reporting  requirements  that  are applicable  to  public  companies  that  are  not  emerging  growth  companies,  including,  but  not  limited  to,  not  being  required  to
comply with the auditor attestation requirements of Section 404. Once we are no longer an emerging growth company or, if prior to such date, we opt to no longer take
advantage of
the applicable exemption, we will be required to include an opinion from our independent registered public accounting firm on the effectiveness of our internal controls
over financial reporting.

During the course of our review of our internal controls we may identify deficiencies in our internal controls that we must remediate. If we identify a material weakness
in  our  internal  controls  over  financial  reporting,  we  may  not  detect  errors  on  a  timely  basis  and  our  financial  statements  may  be  materially  misstated.  We  or  our
independent registered public accounting firm may not be able to conclude on an ongoing basis that we have effective internal control over financial reporting, which
could harm our operating results, cause investors to lose confidence in our reported financial information and cause the trading price of our stock to fall. In addition, as a
public  company  we  will  be  required  to  file  accurate  and  timely  quarterly  and  annual  reports  with  the  SEC  under  the  Exchange  Act.  In  order  to  report  our  results  of
operations and financial statements on an accurate and timely basis, we will depend
in  part  on  CROs  to  provide  timely  and  accurate  notice  of  their  costs  to  us.  Any  failure  to  report  our  financial  results  on  an  accurate  and  timely  basis  could  result  in
sanctions, lawsuits, delisting of our shares from The Nasdaq Global Select Market or other adverse consequences that would materially harm to our business.

Our ability to use our net operating loss carryforwards and certain other tax attributes may be limited.

We have incurred substantial losses during our history and may never achieve profitability. To the extent that we continue to generate taxable losses, unused losses will
carry forward to offset a portion of future taxable income, if any, until such unused losses expire, if ever. Under Sections 382 and 383 of the Internal Revenue Code of
1986, as amended, if a corporation undergoes an “ownership change,” generally defined as a greater than 50 percentage point change (by value) in its equity ownership
by  certain  stockholders  over  a  three-year  period,  the  corporation’s  ability  to  use  its  pre-change  net  operating  loss  carryforwards,  or  NOLs,  and  other  pre-change  tax
attributes (such as research and development tax credits) to offset its post- change income or taxes may be limited. We may have experienced ownership changes in the
past and may experience ownership changes in the future as a result of subsequent shifts in our stock ownership (some of which shifts are outside our control). As a
result, if we earn net taxable income, our ability to use our pre-change NOLs to offset such taxable income could be subject to limitations. Similar provisions of state tax
law may also apply. As a result, even if we achieve profitability, we may be unable to use a material portion of our NOLs and other tax attributes.

Provisions in our charter documents and under Delaware law could discourage a takeover that stockholders may consider favorable and may lead to entrenchment
of management.

Our amended and restated certificate of incorporation and amended and restated bylaws contain provisions that could delay or prevent changes in control or changes in
our management without the consent of our board of directors. These provisions include the following:

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a classified board of directors with three-year staggered terms, which may delay the ability of stockholders to change the membership of a majority of our
board of directors;

no cumulative voting in the election of directors, which limits the ability of minority stockholders to elect director candidates;

the exclusive right of our board of directors to elect a director to fill a vacancy created by the expansion of the board of directors or the resignation, death or
removal of a director, which prevents stockholders from being able to fill vacancies on our board of directors;

the ability of our board of directors to authorize the issuance of shares of preferred stock and to determine the price and other terms of those shares, including
preferences and voting rights, without stockholder approval, which could be used to significantly dilute the ownership of a hostile acquiror;

the ability of our board of directors to alter our amended and restated bylaws without obtaining stockholder approval;

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the required approval of at least 66 2/3% of the shares entitled to vote at an election of directors to adopt, amend or repeal our amended and restated bylaws
or repeal the provisions of our amended and restated certificate of incorporation regarding the election and removal of directors;

a prohibition on stockholder action by written consent, which forces stockholder action to be taken at an annual or special meeting of our stockholders;

the requirement that a special meeting of stockholders may be called only by the chief executive officer or the president or the board of directors, which may
delay the ability of our stockholders to force consideration of a proposal or to take action, including the removal of directors; and

advance notice procedures that stockholders must comply with in order to nominate candidates to our board of directors or to propose matters to be acted
upon at a stockholders’ meeting, which may discourage or deter a potential acquiror from conducting a solicitation of proxies to elect the acquiror’s own slate
of directors or otherwise attempting to obtain control of us.

We are also subject to the anti-takeover provisions contained in Section 203 of the Delaware General Corporation Law. Under Section 203, a corporation may not, in
general,  engage  in  a  business  combination  with  any  holder  of  15%  or  more  of  its  capital  stock  unless  the  holder  has  held  the  stock  for  three  years  or,  among  other
exceptions, the board of directors has approved the transaction.

Claims  for  indemnification  by  our  directors  and  officers  may  reduce  our  available  funds  to  satisfy  successful  third-party  claims  against  us  and  may  reduce  the
amount of money available to us.

Our amended and restated certificate of incorporation and amended and restated bylaws provide that we will indemnify our directors and officers, in each case to the
fullest extent permitted by Delaware law.

In addition, as permitted by Section 145 of the Delaware General Corporation Law, our amended and restated bylaws and our indemnification agreements that we have
entered into with our directors and officers provide that:

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We will indemnify our directors and officers for serving us in those capacities or for serving other business enterprises at our request, to the fullest extent
permitted by Delaware law. Delaware law provides that a corporation may indemnify such person if such person acted in good faith and in a manner such
person reasonably believed to be in or not opposed to the best interests of the registrant and, with respect to any criminal proceeding, had no reasonable cause
to believe such person’s conduct was unlawful.

We may, in our discretion, indemnify employees and agents in those circumstances where indemnification is permitted by applicable law.

We  are  required  to  advance  expenses,  as  incurred,  to  our  directors  and  officers  in  connection  with  defending  a  proceeding,  except  that  such  directors  or
officers shall undertake to repay such advances if it is ultimately determined that such person is not entitled to indemnification. We will not be obligated
pursuant to our amended and restated bylaws to indemnify a person with respect to proceedings initiated by that person against us or our other indemnitees,
except with respect to proceedings authorized by our board of directors or brought to enforce a right to indemnification.

The rights conferred in our amended and restated bylaws are not exclusive, and we are authorized to enter into indemnification agreements with our directors,
officers, employees and agents and to obtain insurance to indemnify such persons.

We may not retroactively amend our amended and restated bylaw provisions to reduce our indemnification obligations to directors, officers, employees and
agents.

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We do not currently intend to pay dividends on our common stock, and, consequently, your ability to achieve a return on your investment will depend on appreciation
in the price of our common stock.

We do not currently intend to pay any cash dividends on our common stock for the foreseeable future. We currently intend to invest our future earnings, if any, to fund
our growth. Therefore, you are not likely to receive any dividends on your common stock for the foreseeable future. Since we do not intend to pay dividends, your ability
to receive a return on your investment will depend on any future appreciation in the market value of our common stock. There is no guarantee that our common stock
will appreciate or even maintain the price at which our holders have purchased it.

General Risk Factors

We  or  the  third  parties  upon  whom  we  depend  may  be  adversely  affected  by  earthquakes,  other  natural  disasters  or  unforeseen  pandemics  and  public  health
emergencies, such as the COVID-19 pandemic, and our business continuity and disaster recovery plans may not adequately protect us from a serious disaster.

Our  corporate  headquarters  and  other  facilities  are  located  in  the  San  Francisco  Bay  Area,  which  in  the  past  has  experienced  both  severe  earthquakes  and  wildfires.
Although we carry earthquake insurance, it is limited in scope. Earthquakes, wildfires or other natural disasters could severely disrupt our operations, and have a material
adverse effect on our business, results of operations, financial condition and prospects.

If  a  natural  disaster,  power  outage  or  other  event  occurred  that  prevented  us  from  using  all  or  a  significant  portion  of  our  headquarters,  that  damaged  critical
infrastructure, such as our enterprise financial systems or manufacturing resource planning and enterprise quality systems, or that otherwise disrupted operations, it may
be difficult or, in certain cases, impossible, for us to continue our business for a substantial period of time. The disaster recovery and
business continuity plans we have in place currently are limited and are unlikely to prove adequate in the event of a serious disaster or similar event. We may incur
substantial expenses as a result of the limited nature of our disaster recovery and business continuity plans, which, particularly when taken together with our lack of
earthquake insurance, could have a material adverse effect on our business. Measures taken in response to a pandemic, such as the COVID-19 pandemic, which causes a
public health emergency, could also disrupt our operations, and have a material adverse effect on our business, results of operations, financial condition and prospects.
For example, in mid-March 2020, in alignment with federal, state and local guidance designed to slow the spread of COVID-19, we transitioned to a reduced onsite
staffing model and remote work plan for all employees who cannot perform their work from home, such as our laboratory, operations, and facilities staff. As the COVID-
19 pandemic evolves, we may be required to take additional actions that could impact our operations if required by applicable laws or regulations or if we determine to
be in the best interests of our employees.

Furthermore, integral parties in our supply chain are similarly vulnerable to natural disasters or other sudden, unforeseen and severe adverse events. If such an event were
to affect our supply chain, it could have a material adverse effect on our business.

Significant  disruptions  of  information  technology  systems  or  breaches  of  data  security  could  materially  adversely  affect  our  business,  results  of  operations  and
financial condition.

We collect and maintain information in digital form that is necessary to conduct our business, and we are increasingly dependent on information technology systems and
infrastructure  to  operate  our  business.  In  the  ordinary  course  of  our  business,  we  collect,  store  and  transmit  large  amounts  of  confidential  information,  including
intellectual property, proprietary business information and personal information. It is critical that we do so in a secure manner to maintain the confidentiality and integrity
of  such  confidential  information.  We  have  established  physical,  electronic  and  organizational  measures  to  safeguard  and  secure  our  systems  to  prevent  a  data
compromise, and rely on commercially available systems, software, tools, and monitoring to provide security for our information technology systems and the processing,
transmission and storage of digital information. We have also outsourced elements of our information technology infrastructure, and as a result a number of third-party
vendors  may  or  could  have  access  to  our  confidential  information.  Our  internal  information  technology  systems  and  infrastructure,  and  those  of  our  current  and  any
future collaborators, contractors and consultants and other third parties on which we

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rely,  are  vulnerable  to  damage  from  computer  viruses,  malware,  natural  disasters,  terrorism,  war,  telecommunication  and  electrical  failures,  cyberattacks  or  cyber-
intrusions over the Internet, attachments to emails, persons inside our organization, or persons with access to systems inside our organization.

The risk of a security breach or disruption, particularly through cyberattacks or cyber-intrusion, including by computer hackers, “phishing” attacks, foreign governments
and cyber terrorists, has generally increased as the number, intensity and sophistication of attempted attacks and intrusions from around the world have increased. In
addition, the prevalent use of mobile devices that access confidential information increases the risk of data security breaches, which could lead to the loss of confidential
information or other intellectual property. As a result of COVID-19, we may face increased cybersecurity risks due to our reliance on internet technology and the number
of our employees that are working remotely, which may create additional opportunities for cybercriminals to exploit vulnerabilities. The costs to us to mitigate network
security  problems,  bugs,  viruses,  worms,  malicious  software  programs  and  security  vulnerabilities  could  be  significant,  and  while  we  have  implemented  security
measures to protect our data security and information technology systems, our efforts to address these problems may not be successful, and these problems could result in
unexpected interruptions, delays, cessation of service and other harm to our business and our competitive position. If such an event were to occur and cause interruptions
in our operations, it could result in a material disruption of our product development programs. For example, the loss of clinical study data from completed or ongoing or
planned clinical studies could result in delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data.

Moreover, if a computer security breach affects our systems, or those of our current and any future collaborators, contractors and consultants and other third parties on
which we rely, or results in the unauthorized release of personally identifiable information, our reputation could be materially damaged. In addition, such a breach may
require notification to governmental agencies, the media or individuals pursuant to various federal and state privacy and security laws, if applicable, including the Health
Insurance  Portability  and  Accountability  Act  of  1996,  as  amended  by  the  Health  Information  Technology  for  Economic  and  Clinical  Health  Act  of  2009,  and  its
implementing rules and regulations, as well as regulations promulgated by the Federal Trade Commission and state breach notification laws. We would also be exposed
to a risk of loss or litigation and potential liability, which could materially adversely affect our business, results of operations and financial condition.

Our  employees  and  independent  contractors,  including  principal  investigators,  consultants,  commercial  collaborators,  service  providers  and  other  vendors  may
engage in misconduct or other improper activities, including noncompliance with regulatory standards and requirements, which could have an adverse effect on our
results of operations.

We are exposed to the risk that our employees and independent contractors, including principal investigators, consultants, any future commercial collaborators, service
providers and other vendors may engage in misconduct or other illegal activity. Misconduct by these parties could include intentional, reckless and/or negligent conduct
or other unauthorized activities that violate the laws and regulations of the FDA and other similar regulatory bodies,
including  those  laws  that  require  the  reporting  of  true,  complete  and  accurate  information  to  such  regulatory  bodies;  manufacturing  standards;  U.S.  federal  and  state
healthcare fraud and abuse, data privacy laws and other similar non-U.S. laws; or laws that require the true, complete and accurate reporting of financial information or
data. Activities subject to these laws also involve the improper use or misrepresentation of information obtained in the course of
clinical  studies,  the  creation  of  fraudulent  data  in  our  preclinical  studies  or  clinical  studies,  or  illegal  misappropriation  of  product,  which  could  result  in  regulatory
sanctions and cause serious harm to our reputation. It
is not always possible to identify and deter misconduct by employees and other third-parties, and the precautions we take to detect and prevent this activity may not be
effective in controlling unknown or unmanaged risks or losses or in protecting us from governmental investigations or other actions or lawsuits stemming from a failure
to be in compliance with such laws or regulations. In addition, we are subject to the risk that a person or government could allege such fraud or other misconduct, even if
none occurred. If any such actions are instituted against us, and we are not successful in defending ourselves or asserting our rights, those actions could have a significant
impact on our business and financial results, including, without limitation, the imposition of significant civil, criminal and administrative penalties, damages, monetary
fines,  disgorgements,  possible  exclusion  from  participation  in  Medicare,  Medicaid  and  other  U.S.  healthcare  programs,  individual  imprisonment,  other  sanctions,
contractual  damages,  reputational  harm,  diminished  profits  and  future  earnings  and  curtailment  of  our  operations,  any  of  which  could  adversely  affect  our  ability  to
operate our business and our results of operations.

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Our  business  involves  the  use  of  hazardous  materials,  and  we  and  our  third-party  manufacturers  and  suppliers  must  comply  with  environmental  laws  and
regulations, which can be expensive and restrict how we do business.

Our  research  and  development  activities  and  our  third-party  manufacturers’  and  suppliers’  activities  involve  the  controlled  storage,  use  and  disposal  of  hazardous
materials  owned  by  us,  including  the  components  of  our  product  and  drug  candidates  and  other  hazardous  compounds.  We  and  any  third-party  manufacturers  and
suppliers  we  engage  are  subject  to  numerous  federal,  state  and  local  environmental,  health  and  safety  laws,  regulations  and  permitting  requirements,  including  those
governing  laboratory  procedures;  the  generation,  handling,  use,  storage,  treatment,  and  disposal  of  hazardous  and  regulated  materials  and  wastes;  the  emission  and
discharge of hazardous materials into the ground, air and water; and employee health and safety. Our operations involve the use of hazardous and flammable materials,
including chemicals and biological and radioactive materials. Our operations also produce hazardous waste. In some cases, these hazardous materials and various wastes
resulting from their use are stored at our and our manufacturers’ facilities pending their use and disposal. We generally contract with third parties for the disposal of these
materials  and  wastes.  We  cannot  eliminate  the  risk  of  contamination,  which  could  cause  an  interruption  of  our  commercialization  efforts,  research  and  development
efforts and business operations,
environmental  damage  resulting  in  costly  clean-up  and  liabilities  under  applicable  laws  and  regulations  governing  the  use,  storage,  handling  and  disposal  of  these
materials and specified waste products.

Although  we  believe  that  the  safety  procedures  utilized  by  our  third-party  manufacturers  for  handling  and  disposing  of  these  materials  generally  comply  with  the
standards  prescribed  by  these  laws  and  regulations,  we  cannot  guarantee  that  this  is  the  case  or  eliminate  the  risk  of  accidental  contamination  or  injury  from  these
materials.  Under  certain  environmental  laws,  we  could  be  held  responsible  for  costs  relating  to  any  contamination  at  our  current  or  past  facilities  and  at  third-party
facilities.  In  such  an  event,  we  may  be  held  liable  for  any  resulting  damages  and  such  liability  could  exceed  our  resources  and  state  or  federal  or  other  applicable
authorities  may  curtail  our  use  of  certain  materials  and/or  interrupt  our  business  operations.  Furthermore,  environmental  laws  and  regulations  are  complex,  change
frequently and have tended to become more stringent. We cannot predict the impact of such changes and cannot be certain of our future compliance.

Compliance with applicable environmental laws and regulations may be expensive, and current or future environmental laws and regulations may impair our research,
product development and manufacturing efforts. In addition, we cannot entirely eliminate the risk of accidental injury or contamination from these materials or wastes.
Although we maintain workers’ compensation insurance to cover us for costs and expenses, we may incur due to injuries to our employees resulting from the use of
hazardous  materials,  this  insurance  may  not  provide  adequate  coverage  against  potential  liabilities.  We  do  not  carry  specific  biological  or  hazardous  waste  insurance
coverage, and our property, casualty, and general liability insurance policies specifically exclude coverage for damages and fines arising from biological or hazardous
waste exposure or contamination. Accordingly, in the event of contamination or injury, we could be held liable for damages or be penalized with fines in an amount
exceeding  our  resources,  and  our  clinical  studies  or  regulatory  approvals  could  be  suspended,  which  could  have  a  material  adverse  effect  on  our  business,  results  of
operations and financial condition.

We may be subject to claims challenging the inventorship or ownership of our patents and other intellectual property.

We  may  also  be  subject  to  claims  that  former  employees,  collaborators  or  other  third  parties  have  an  ownership  interest  in  our  patents  or  other  intellectual  property.
Litigation  may  be  necessary  to  defend  against  these  and  other  claims  challenging  inventorship  or  ownership.  If  we  fail  in  defending  any  such  claims,  in  addition  to
paying  monetary  damages,  we  may  lose  valuable  intellectual  property  rights.  Such  an  outcome  could  have  a  material  adverse  effect  on  our  business.  Even  if  we  are
successful in defending against such claims, litigation could result in substantial costs and distraction to management and other employees.

We may not be able to protect our intellectual property rights throughout the world.

Filing, prosecuting and defending patents on drug candidates in all countries throughout the world would be prohibitively expensive, and our intellectual property rights
in  some  countries  outside  the  United  States  can  be  less  extensive  than  those  in  the  United  States.  In  addition,  the  laws  of  some  foreign  countries  do  not  protect
intellectual

81

 
 
 
 
 
 
 
 
 
property rights to the same extent as federal and state laws in the United States. Consequently, we may not be able to prevent third parties from practicing our inventions
in  all  countries  outside  the  United  States,  or  from  selling  or  importing  products  made  using  our  inventions  in  and  into  the  United  States  or  other  jurisdictions.
Competitors may use our technologies in jurisdictions where we have not obtained patent protection to develop their own products and further, may export otherwise
infringing products to territories where we have patent protection, but enforcement is not as strong as that in the United States. These products may compete with our
products and our patents or other intellectual property rights may not be effective or sufficient to prevent them from competing.

Many  companies  have  encountered  significant  problems  in  protecting  and  defending  intellectual  property  rights  in  foreign  jurisdictions.  The  legal  systems  of  certain
countries,  particularly  certain  developing  countries,  do  not  favor  the  enforcement  of  patents  and  other  intellectual  property  protection,  particularly  those  relating  to
biopharmaceuticals, which could make it difficult for us to stop the infringement of our patents or marketing of competing products in violation of our proprietary rights
generally. Proceedings to enforce our patent rights in foreign jurisdictions could result in substantial costs and divert our efforts and attention from other aspects of our
business, could put our patents at risk of being invalidated or interpreted narrowly and our patent applications at risk of not issuing and could provoke third parties to
assert claims against us. We may not prevail in any lawsuits that we initiate and the damages or other remedies awarded, if any, may not be commercially meaningful.

Accordingly, our efforts to enforce our intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual
property that we develop or license.

Changes in and failures to comply with U.S. and foreign privacy and data protection laws, regulations and standards may adversely affect our business, operations
and financial performance.

We  are  subject  to  or  affected  by  numerous  federal,  state  and  foreign  laws  and  regulations,  as  well  as  regulatory  guidance,  governing  the  collection,  use,  disclosure,
retention, and security of personal information, such as information that we collect about patients and healthcare providers in connection with clinical trials in the United
States and abroad. The global data protection landscape is rapidly evolving, and implementation standards and enforcement practices are likely to remain uncertain for
the foreseeable future. This evolution may create uncertainty in our business, affect our or any service providers’, contractors’ or future collaborators’ ability to operate
in certain jurisdictions or to collect, store, transfer use and share personal information, necessitate the acceptance of more onerous obligations in our contracts, result in
liability or impose additional costs on us. The cost of compliance with these laws, regulations and standards is high and is likely to increase in the future. Any failure or
perceived  failure  by  us  or  our  collaborators,  service  providers  and  contractors  to  comply  with  federal,  state  or  foreign  laws  or  regulation,  our  internal  policies  and
procedures or our contracts governing processing of personal information could result in negative publicity, diversion of management time and effort and proceedings
against us by governmental entities or others. In many jurisdictions, enforcement actions and consequences for noncompliance are rising.

In  the  United  States,  HIPAA  imposes  privacy,  security  and  breach  reporting  obligations  with  respect  to  individually  identifiable  health  information  upon  “covered
entities” (health plans, health care clearinghouses and certain health care providers), and their respective business associates, individuals or entities that create, receive,
maintain or transmit protected health information in connection with providing a service for or on behalf of a covered entity.
HIPAA mandates the reporting of certain breaches of health information to HHS, affected individuals and if the breach is large enough, the media. Entities that are found
to be in violation of HIPAA as the result of a breach of unsecured protected health information, a complaint about privacy practices or an audit by HHS, may be subject
to significant civil, criminal and administrative fines and penalties and/or additional reporting and oversight obligations if required to enter into a resolution agreement
and corrective action plan with HHS to settle allegations of HIPAA non-compliance. Even when HIPAA does not apply, according to the Federal Trade Commission, or
the FTC, violating consumers’ privacy rights or failing to take appropriate steps to keep consumers’ personal information secure may constitute unfair acts or practices in
or affecting commerce in violation of Section 5(a) of the FTC Act. The FTC expects a company’s data security measures to be reasonable and appropriate in light of the
sensitivity  and  volume  of  consumer  information  it  holds,  the  size  and  complexity  of  its  business,  and  the  cost  of  available  tools  to  improve  security  and  reduce
vulnerabilities. Individually identifiable health information is considered sensitive data that merits stronger safeguards.

82

 
 
 
 
 
 
 
In addition, certain state laws govern the privacy and security of personal information, including health-related information, in certain circumstances, some of which are
more  stringent  than  HIPAA  and  many  of  which  differ  from  each  other  in  significant  ways  and  may  not  have  the  same  effect,  thus  complicating  compliance  efforts.
Failure  to  comply  with  these  laws,  where  applicable,  can  result  in  the  imposition  of  significant  civil  and/or  criminal  penalties  and  private  litigation.  For  example,
California  enacted  the  California  Consumer  Privacy  Act,  or  the  CCPA,  on  June  28,  2018,  which  went  into  effect  on  January  1,  2020.  The  CCPA  gives  California
residents expanded rights to access and delete their personal information, opt out of certain personal information sharing, and receive detailed information about how
their personal information is used. The CCPA provides for civil penalties for violations, as well as a private right of action for data breaches that is expected to increase
data breach litigation. The CCPA may increase our compliance costs and potential liability. Some observers have noted that the CCPA could mark the beginning of a
trend toward more stringent privacy legislation in the United States, which could increase our potential liability and adversely affect our business. Further, the California
Privacy Rights Act, or the CPRA, recently passed in California as well. The CPRA will impose additional data protection obligations on covered businesses, including
additional consumer rights processes, limitations on data uses, new audit requirements for higher risk data, and opt outs for certain uses of sensitive data. It will also
create a new California data protection agency authorized to issue substantive regulations and could result in increased privacy and information security enforcement.
The majority of the provisions will go into effect on January 1, 2023, and additional compliance investment and potential business process changes may be required.

Our operations abroad may also be subject to increased scrutiny or attention from data protection authorities. Many countries in these regions have established or are in
the process of establishing privacy and data security legal frameworks with which we, our collaborators, service providers, including our CRO, and contractors must
comply. For example, the EU General Data Protection Regulation, or GDPR, went into effect in May 2018 and imposes
strict requirements for processing the personal information of subjects within the EEA, including clinical trial data. Further, applicable privacy laws and court decisions
could impact our ability to transfer personal data internationally. Recent legal developments in Europe have created complexity and compliance uncertainty regarding
certain transfers of personal data from the EEA. For example, on July 16, 2020, the Court of Justice of the European Union, or the CJEU invalidated the EU-U.S. Privacy
Shield Framework, or the Privacy Shield, under which personal data could be transferred from the EEA to United States entities who had self-certified under the Privacy
Shield scheme. As a result, the Privacy Shield is no longer a valid mechanism for transferring personal data from the EEA to the United States. Moreover, it is uncertain
whether standard contractual clauses will also be invalidated by the European courts or legislature as a mechanism to comply with EU data protection requirements for
data transfers. The GDPR has and will continue to increase compliance burdens on us, including by mandating potentially burdensome documentation requirements and
granting certain rights to individuals to control how we collect, use, disclose, retain and process information about them. The processing of sensitive personal data, such
as health data, may impose heightened compliance burdens under the GDPR and is a topic of active interest among foreign regulators.

In addition, the GDPR provides for more robust regulatory enforcement and fines of up to €20 million or 4% of the annual global revenue of the noncompliant company,
whichever is greater. Further, beginning January 1, 2021, we may have to comply with the GDPR and the GDPR as incorporated into United Kingdom national law, the
latter regime having the ability to separately fine up to the greater of £17.5 million or 4% of global turnover. The relationship between the United Kingdom and the EU in
relation to certain aspects of data protection law remains unclear, for example around how data can lawfully be transferred between each jurisdiction, which exposes us to
further  compliance  risk.  As  we  expand  into  other  foreign  countries  and  jurisdictions,  we  may  be  subject  to  additional  laws  and  regulations  that  may  affect  how  we
conduct business.

Item 1B. Unresolved Staff Comments.

None.

83

 
 
 
 
Item 2. Properties.

Our corporate headquarters are located in South San Francisco, California, where we currently lease approximately 62,000 square feet of office and laboratory space
pursuant to a lease dated February 28, 2019. Substantially all our employees work at our corporate headquarters.

Item 3. Legal Proceedings.

We are not currently a party to any material litigation or other material legal proceedings.

Item 4. Mine Safety Disclosures.

Not applicable.

84

 
Item 5. Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities.

Market Information for Common Stock

PART II

Our common stock has been listed on The Nasdaq Global Select Market under the symbol “UBX” since May 3, 2018. As of March 1, 2021, there were 63 holders of
record of our common stock. Because many of our shares of common stock are held by brokers and other institutions on behalf of stockholders, we are unable to estimate
the total number of beneficial owners of our common stock represented by these record holders.

Dividend Policy

We have never declared or paid any cash dividends on our common stock or any other securities. We anticipate that we will retain all available funds and any future
earnings, if any, for use in the operation of our business and do not anticipate paying cash dividends in the foreseeable future. In addition, future debt instruments may
materially restrict our ability to pay dividends on our common stock. Payment of future cash dividends, if any, will be at the discretion of the board of directors after
taking into account various factors, including our financial condition, operating results, current and anticipated cash needs, the requirements of current or then-existing
debt instruments and other factors the board of directors deems relevant.

85

 
Performance Graph

This graph is not “soliciting material” or deemed “filed” with the SEC for purposes of Section 18 of the Exchange Act, or otherwise subject to liabilities under that
Section, and shall not be deemed incorporated by reference into any filing of Unity Biotechnology, Inc. under the Securities Act of 1933, as amended (the “Securities
Act”), whether made before or after the date hereof and irrespective of any general incorporation language in any such filing.

The following graph compares the cumulative total return on our common stock relative to the cumulative total returns of the Nasdaq Composite Index and the Nasdaq
Biotechnology Index. Pursuant to applicable Securities and Exchange Commission rules, all values assume reinvestment of the full amount of all dividends, however no
dividends have been declared on our common stock to date. The stockholder returns shown on the graph below are based on historical results and are not necessarily
indicative of future performance, and we do not make or endorse any predictions as to future stockholder returns.

Sales of Unregistered Securities

During the year ended December 31, 2020, we issued 361,644 shares of our common stock to Ascentage Pharma and an academic institution pursuant to the Commercial
Agreements.  The  issuance  of  such  was  made  in  reliance  upon  exemptions  from  registration  pursuant  to  Section  4(2)  under  the  Securities  Act  of  1933,  as  amended  (the
“Securities  Act”),  and  Rule  506  promulgated  thereunder,  and  Ascentage  represented  to  us  that  it  is  an  “accredited  investor”  within  the  meaning  of  Rule  501  under  the
Securities Act. Accordingly, the shares have not been registered under the Securities Act, and until so registered, these securities may not be offered or sold in the United
States absent registration or availability of an applicable exemption from registration. No underwriting discounts or commissions or similar fees were payable in connection
with the issuance.

Repurchase of Shares or of Company Equity Securities

None.

86

 
Item 6. Selected Financial Data.

You  should  read  the  following  selected  historical  financial  data  below  together  with  “Management’s  Discussion  and  Analysis  of  Financial  Condition  and  Results  of
Operations” and our audited financial statements, related notes and other financial information included elsewhere in this report. The selected financial data in this section are
not intended to replace the financial statements and are qualified in their entirety by the audited financial statements and related notes included elsewhere in this report.

We derived our selected statements of operations data for the years ended December 31, 2020, 2019 and 2018 and our balance sheet data as of December 31, 2020 and 2019
from our audited financial statements included elsewhere in this report. We derived our selected statements of operations data for the year ended December 31, 2017 and our
balance sheet data as of December 31, 2018 and 2017 from our audited financial statements which are not included in this report. Our historical results are not necessarily
indicative of the results that may be expected in any future period. The selected financial data below should be read in conjunction with the section entitled “Management’s
Discussion and Analysis of Financial Condition and Results of Operations” and our financial statements and related notes included elsewhere in this report.

2020

Year Ended December 31,
2018
(in thousands, except share and per share data)

2017

2019

2016

Statement of Operations Data:
Contribution revenue
Operating expenses:

Research and development
General and administrative
Change in fair value of contingent consideration
Impairment of long-lived assets

Total operating expenses
Loss from operations
Loss on extinguishment of promissory notes
Interest income
Interest expense
Other income (expense), net
Net loss

Net loss per share, basic and diluted(1)

Weighted average number of shares used in
   computing net loss per share,
   basic and diluted(1)

  $

—    $

—    $

—    $

1,382    $

— 

67,309     
24,025     
(33)    
2,629     
93,930     
(93,930)    
—     
1,196     
(1,292)    
182     
(93,844)   $

70,957     
20,046     
(1,352)    
—     
89,651     
(89,651)    
—     
3,289     
—     
4,185     
(82,177)   $

58,907     
16,016     
4,542     
—     
79,465     
(79,465)    
—     
3,312     
—     
(245)    
(76,398)   $

37,373     
9,617     
—     
—     
46,990     
(45,608)    
—     
1,055     
—     
(103)    
(44,656)   $

(1.84)   $

(1.88)   $

(2.70)   $

(13.97)   $

13,707 
5,137 
— 
— 
18,844 
(18,844)
(9,377)
— 
(2,183)
— 
(30,404)

(11.42)

  $

  $

    50,864,889      43,624,807      28,269,907     

3,197,516     

2,662,841

(1)

See Note 13 to our audited financial statements for an explanation of the calculations of our basic and diluted net loss per common share and the weighted-
average number of common shares used in the computation of the per share amounts.  

87

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
      
      
      
      
  
   
      
      
      
      
  
   
   
   
   
   
   
   
   
   
   
 
 
 
Balance Sheet Data:
Cash and cash equivalents
Marketable securities
Working capital
Total assets
Long-term debt, net
Convertible preferred stock
Accumulated deficit
Total stockholders’ equity (deficit)

2020

2019

As of December 31,
2018
(in thousands)

2017

2016

  $

17,807    $
97,763     
86,403     
156,319     
24,508     
—     
(339,299)    
82,880     

37,473    $
87,533     
112,271     
151,221     
—     
—     
(245,455)    
120,707     

15,399    $
155,736     
156,383     
181,375     
—     
—     
(163,278)    
160,693     

7,298    $
84,330     
80,983     
102,024     
—     
173,956     
(86,880)    
(83,113)    

89,286 
— 
89,718 
96,648 
— 
131,089 
(42,224)
(41,536)

88

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
      
      
      
      
  
   
   
   
   
   
   
   
 
 
Item 7. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

You  should  read  the  following  discussion  and  analysis  of  our  financial  condition  and  results  of  operations  together  with  the  section  entitled  “Selected
Financial Data” and our audited financial statements and related notes included elsewhere in this report. This discussion and other parts of this report contain forward-
looking statements that involve risks and uncertainties, such as our plans, objectives, expectations, intentions and beliefs. Our actual results could differ materially from
those discussed in these forward-looking statements. Factors that could cause or contribute to such differences include, but are not limited to, those identified below and
those discussed in the section entitled “Risk Factors” included elsewhere in this report.

Overview

We  are  a  biotechnology  company  engaged  in  researching  and  developing  therapeutics  to  slow,  halt  or  reverse  diseases  of  aging.  Our  initial  focus  is  on

creating senolytic medicines to selectively eliminate senescent cells and thereby treat diseases of aging, such as ophthalmologic and neurologic diseases.

In  July  2020,  we  filed  an  Investigational  New  Drug  application,  or  IND,  to  commence  a  Phase  1  study  of  UBX1325  in  patients  with  diabetic  macular
edema, or DME, and age-related macular degeneration, or AMD. UBX1325 is a potent small molecule inhibitor of the anti-apoptotic Bcl-2 family member, Bcl-xL. We
initiated a Phase 1 clinical study of UBX1325 and dosed the first patient in October 2020 and expect to obtain initial safety and tolerability results from this study in the
first  half  of  2021.  The  overall  clinical  program  is  directed  at  multiple  age-related  diseases  of  the  eye,  including  diabetic  retinopathy  and  age-related  macular
degeneration, as well as DME. However, the impact of the COVID-19 pandemic on the timing of study enrollment, visit adherence and completions is hard to assess due
to the rapidly evolving nature of the situation and it is possible that the study enrollment, visit adherence and completion may be delayed.

In August 2020, we announced the 12-week results from our Phase 2 study of UBX0101 in patients with moderate-to-severe painful osteoarthritis, or OA of
the knee. There was no statistically significant difference between any arm of UBX0101 and placebo at the 12-week primary endpoint of the study. Given these results,
we are not progressing UBX0101 into pivotal studies and will narrow our near-term focus to our ongoing ophthalmologic and neurologic disease programs.

In September 2020, we implemented a corporate restructuring to align our resources on cellular senescence programs in ophthalmology and neurology while
further extending operating capital. The restructuring resulted in an elimination of approximately 33 positions, or approximately 32% of our workforce, as of September
30, 2020. We incurred a one-time employee benefits and severance charge of approximately $1.8 million in the year ended December 31, 2020. We expect these steps
will extend our cash runway into the second half of 2022, and we project current cash and cash equivalents will fund key clinical data readouts for UBX1325.

Since  the  commencement  of  our  operations,  we  have  invested  a  significant  portion  of  our  efforts  and  financial  resources  in  research  and  development
activities, and we have incurred net losses each year since inception. Our net losses were $93.8 million and $82.2 million for the years ended December 31, 2020 and
2019, respectively. We do not have any products approved for sale, and we have never generated any revenue from contracts with customers. As of December 31, 2020,
we had an accumulated deficit of $339.3 million, and we do not expect positive cash flows from operations in the foreseeable future. We expect to continue to incur net
operating losses for at least the next several years as we continue our research and development efforts, advance our drug candidates through preclinical and clinical
development, seek regulatory approval, prepare for and, if approved,
proceed to commercialization.

In  August  2020  we  entered  into  a  Loan  and  Security  Agreement,  or  the  Loan  Agreement,  with  Hercules  Capital,  Inc.  and  $25.0  million  dollars  was
advanced to us upon execution of the Loan Agreement. The milestones for the remaining tranches have not yet been reached and, as of December 31, 2020 will not be
reached as they were dependent, in whole or in part, upon the continued advancement in the clinical development of UBX0101 in patients with osteoarthritis of the knee.
Starting in July 2021, we will be subject to a liquidity covenant requiring us to maintain a cash reserve of at least $15.0 million. We will make interest only payments
through September 1, 2022,

89

 
 
 
 
 
 
 
 
or extended to March 1, 2023 upon satisfaction of certain milestones, and will then repay the principal balance and interest in equal monthly installments through August
1, 2024.

Prior to entering the Loan Agreement, we have historically funded our operations primarily from the issuance and sale of convertible preferred stock and
convertible promissory notes, as well as public equity issuances. On June 3, 2019, we entered into a sales agreement or, the June 2019 Sales Agreement, with Cowen and
Company, LLC, or Cowen, to sell shares of our common stock, from time to time, with aggregate gross sales proceeds of up
to  $75.0  million  through  an  at-the-market  equity  offering  program  under  which  Cowen  acts  as  sales  agent,  or  the  ATM  Offering  Program.  During  the  year  ended
December 31, 2020, we issued and sold 5,002,257 shares of our common stock through our ATM Offering Program and received net proceeds of approximately $37.3
million, after deducting commissions and other offering expenses of $1.3 million. On July 31, 2020, we entered into a
second sales agreement, or the July 2020 Sales Agreement, with Cowen to sell an additional $50.0 million of our shares of common stock through an additional at-the-
market equity offering program, or the Additional ATM Offering Program in which Cowen will act as sales agent. As of December 31, 2020, there had been no shares
sold under the Additional ATM Offering Program.

We do not expect to generate revenue from any drug candidates that we develop until we obtain regulatory approval for one or more of such drug candidates
and  commercialize  our  products  or  enter  into  collaborative  agreements  with  third  parties.  Substantially  all  of  our  net  losses  have  resulted  from  costs  incurred  in
connection with our research and development programs and from general and administrative costs associated with our operations.
As a result, we will need to raise additional capital. Adequate funding may not be available to us on acceptable terms, or at all, particularly in light of the current COVID-
19 pandemic and associated economic uncertainty and potential for local and/or global economic recession. If sufficient funds on acceptable terms are not available when
needed, we could be required to significantly reduce our operating expenses and delay, reduce the scope of, or eliminate one or more of our development programs.

We rely on third parties in the conduct of our preclinical studies and clinical trials and for manufacturing and supply of our drug candidates. We have no
internal  manufacturing  capabilities,  and  we  will  continue  to  rely  on  third  parties,  many  of  whom  are  single-source  suppliers,  for  our  preclinical  and  clinical  trial
materials, as well as the commercial supply of our products. In addition, we do not yet have a marketing or sales organization or commercial
infrastructure. Accordingly, we will incur significant expenses to develop a marketing and sales organization and commercial infrastructure in advance of generating any
product sales.

COVID-19 Update

The COVID-19 pandemic has placed strains on the providers of healthcare services, including the healthcare institutions, clinical research organizations, or
CROs, and Institutional Review Boards under whose auspices we conduct our clinical trials. These strains have resulted in limits on the initiation of new clinical trials,
slowing or halting enrollment in existing trials and restrictions placed upon on-site monitoring activities of clinical
trials.  Prior  to  the  completion  of  our  Phase  2  and  Phase  1b  UBX0101  clinical  studies,  we  amended  the  clinical  study  protocols  to  enable  remote  data  collection  for
clinical sites that were limited in their ability to conduct study visits in person, for either site or patient safety reasons. We also instituted remote data source verification
procedures to limit the extent that on-site monitoring was required.

Although one of the manufacturers in our supply chain for UBX0101 experienced a two-week shutdown in April 2020 due to a COVID-19 related incident
and there have been some delays in shipments due to a reduction in overall flights, neither of these factors impacted our supply of UBX0101 prior to our shutting down
development of such program. There have been no other disruptions in our supply chain of drug manufacturers necessary to conduct our clinical trials and we believe we
have sufficient supply of drug inventories to complete our Phase 1 study of UBX1325 in ophthalmologic disease.

Several of the CROs that provide preclinical services to us are based in China and India and experienced temporary shutdowns in February and March due
to government mandates. In each case we were able to reassign the balance of activities to other CROs and the shutdowns did not impact our preclinical timelines. CROs
based in the United States that provide preclinical services are experiencing heavy demand which may impact their ability to

90

 
 
 
 
 
 
 
 
start new studies and could lead to delays in the commencement of our preclinical studies. Several of our U.S.-based academic research partners have also experienced
shutdowns which has slowed progress on several early stage projects, none of which impacted preclinical timelines.

In  late  February  2020,  we  created  an  internal,  cross-functional  COVID-19  Response  Team  to  closely  monitor  the  evolving  situation  and  manage  our
response. In alignment with public health guidance designed to slow the spread of COVID-19, beginning in mid-March 2020, we implemented a reduced onsite staffing
model and transitioned to a remote work plan for all employees other than those providing essential services. For our onsite
employees,  we  have  implemented  heightened  health  and  safety  measures  designed  to  comply  with  applicable  federal,  state  and  local  guidelines  in  response  to  the
COVID-19  pandemic.  We  are  further  supporting  all  of  our  employees  by  leveraging  virtual  meeting  technology  and  encouraging  employees  to  follow  local  health
authority guidance. We may need to undertake additional actions that could impact our operations if required by applicable laws or regulations or if we determine to be in
the best interests of our employees.

Components of Our Results of Operations

Research and Development Expenses

Research and development expenses consist primarily of costs incurred for the development of our drug candidates, which include:

•

•

•

•

•

•

personnel-related  expenses,  including  salaries,  benefits,  severance  and  stock-based  compensation  for  personnel  contributing  to  research  and
development activities;

laboratory expenses including supplies and services;

clinical trial expenses;

expenses incurred under agreements with third-party contract manufacturing organizations, contract research organizations, research and development
service providers, academic research institutions, and consultants;

expenses related to license and sponsored research agreements; and

facilities and other allocated expenses, including expenses for rent and facilities maintenance, and depreciation and amortization.

We expect our research and development expenses to increase as we advance our drug candidates into and through preclinical and clinical trials and pursue
regulatory approval of our drug candidates. The process of conducting the clinical trials required to obtain regulatory approval is costly and time-consuming. Clinical
trials generally become larger and more costly to conduct as they advance into later stages and we are required to make estimates for expense accruals related to clinical
trial expenses.  The actual probability of success for our drug candidates may be affected by a variety of factors including: the safety and efficacy of our drug candidates,
early clinical data, investment in our clinical program, the ability of collaborators, if any, to successfully develop any drug candidates we license to them, competition,
manufacturing capability and commercial viability. We may never succeed in achieving regulatory approval for any of our drug candidates. Program costs that are direct
external  expenses  are  tracked  on  a  program-by-program  basis  once  they  enter  clinical  studies.    As  a  result  of  the  uncertainties  discussed  above,  we  are  unable  to
determine the duration and completion costs of our research and development projects or when and to what extent we will generate revenue from the commercialization
and sale of our drug candidates.

General and Administrative Expenses

Our general and administrative expenses consist primarily of personnel costs, allocated facilities costs and other expenses for outside professional services,
including legal, audit and accounting services, and depreciation and amortization expense related to property and equipment. Personnel costs consist of salaries, benefits,
severance and stock-based compensation. We expect to continue to incur additional expenses associated with operating as a public

91

 
 
 
 
 
 
 
 
company, including expenses related to compliance with the rules and regulations of the Securities and Exchange Commission and standards applicable to companies
listed on a national securities exchange, additional insurance expenses, investor relations activities and other administrative and professional services.

Change Fair Value of Contingent Consideration

Certain of our license agreements include contingent consideration in the form of additional issuances of our common stock based on the achievement of
certain milestones. For asset acquisitions, we assess whether such contingent consideration obligation meets the definition of a derivative and/or can be equity classified,
until such time that the contingency or equity classification criteria is met or expires. We have recorded a liability related to contingent consideration as the net settlement
criteria  of  the  definition  of  a  derivative  had  been  met  and  equity  classification  criteria  had  not  been  met.  The  derivative  related  to  this  contingent  consideration  was
measured at fair value as of each balance sheet date with the related change in fair value being reflected in operating results. Gains or losses on contingent consideration
expense is driven by changes in the estimated fair value of the liability, which is determined using a probability-weighted valuation approach model that reflects the
probability and timing of future issuances of our common shares.

Interest Income

Interest income is primarily related to interest earned on our marketable securities for the years ended December 31, 2020, 2019 and 2018.  

Interest Expense

Interest expense relates to interest on the Loan Agreement entered into during the year ended December 31, 2020.

Other Income (Expense), Net

We  held  an  equity  investment  in  an  entity  called  Ascentage  Pharma  Group  International,  or  Ascentage  International,  an  affiliate  of  a  Hong  Kong-based
clinical-stage biopharmaceutical company called Ascentage Pharma Group Corp. Limited. In October 2019, Ascentage International completed an initial public offering
of  shares  of  its  common  stock  on  the  Hong  Kong  Stock  Exchange.  Following  the  initial  public  offering,  the  underlying  nature  of  our  investment  in  Ascentage
International changed and met the definition of an investment in an equity security with a readily determinable fair value to be measured at fair value on a recurring
basis, based on quoted stock prices available on the Hong Kong Stock Exchange. During the year ended December 31, 2020, we sold our entire equity investment in
Ascentage International. Other income (expense), net, includes the recognized gains and losses resulting from the sale of the investment in this equity security and the
previous changes in fair value.

92

 
 
 
 
 
Results of Operations

Comparison of the Years Ended December 31, 2020 and 2019

The following table sets forth the significant components of our results of operations (in thousands):

Summary of Operations Data:
Operating expenses:

Research and development
General and administrative
Change in fair value of contingent consideration
Impairment of long-lived assets

Total operating expenses
Loss from operations
Interest income
Interest expense
Other income (expense), net
Net loss

Year Ended December 31,
2019
2020

Change

  $

  $

67,309    $
24,025   
(33)  
2,629   
93,930   
(93,930)  
1,196   
(1,292)  
182   
(93,844)   $

70,957    $
20,046   
(1,352)  
—   
89,651   
(89,651)  
3,289   
—   
4,185   
(82,177)   $

(3,648)
3,979 
1,319 
2,629 
4,279 
(4,279)
(2,093)
(1,292)
(4,003)
(11,667)

Research and Development

Research and development expenses decreased by $3.6 million, to $67.3 million for the year ended December 31, 2020 from $71.0 million for the year
ended December 31, 2019. The decrease was primarily due to a decrease of $5.3 million in direct research and development expenses mainly due to lower pre-clinical
research and development activities and contract manufacturing costs, partially offset by higher costs from clinical programs started in late 2019. Laboratory supplies
decreased by $1.9 million and facilities-related costs increased by $2.2 million.  Personnel-related expenses increased by $1.4 million, of which $1.6 million was related
to  non-cash  stock  compensation  expense  partially  offset  by  a  decrease  in  payroll  due  to  the  corporate  restructuring  and  other  costs  such  as  travel,  due  to  employees
working from home.

General and Administrative

General  and  administrative  expenses  increased  by  $4.0  million,  to  $24.0  million  for  the  year  ended  December  31,  2020  from  $20.0  million  for  the  year
ended December 31, 2019. The increase was primarily due to increases of $2.0 million in personnel-related expenses, of which $1.4 million was related to non-cash
stock compensation expense, $0.8 million in professional fees, $0.7 million in facilities-related costs and $0.5 million in insurance-related expense.

Change in fair value of contingent consideration

Change in fair value of contingent consideration reflects a decrease in the contingent consideration liability of $1.3 million for the year ended December 31,
2020. We issued shares in 2020 as a result of meeting a contractual milestone. The change in the fair value of contingent consideration was primarily due to changes in
assumptions, including probabilities, and our stock price used to calculate the fair value of the liability.  Additionally, during the third quarter of 2020, we made changes
to the related contracts, which resulted in there being no contingent consideration liability at December 31, 2020.

Impairment of Long-Lived Assets

Impairment charges consisted of impairment of long-lived assets. We evaluated the right-of-use asset and related leasehold improvements upon exit of our

former headquarters located in Brisbane, California, and recorded an impairment charge of $2.6 million during the year.

93

 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest Income

Our  interest  income  was  $1.2  million  for  the  year  ended  December  31,  2020,  as  compared  to  $3.3  million  for  the  year  ended  December  31,  2019.  The

decrease is primarily attributable to lower market yields and cash balances on the Company’s cash equivalents and marketable securities.

Interest Expense

Our interest expense of $1.3 million for the year ended December 31, 2020 is related to the Loan Agreement.

Other Income (Expense), Net

Other income was $0.2 million for the year ended December 31, 2020, as compared to $4.2 million for the year ended December 31, 2019. The decrease

was primarily due to a change in the fair value of our investment in the common stock of Ascentage International.

Comparison of the years ended December 31, 2019 and 2018

The following table sets forth the significant components of our results of operations (in thousands):

Summary of Operations Data:
Operating expenses:

Research and development
General and administrative
Change in fair value of contingent consideration

Total operating expenses
Loss from operations
Interest income
Other income (expense), net
Net loss

Year Ended December 31,
2018
2019

Change

  $

  $

70,957    $
20,046   
(1,352)  
89,651   
(89,651)  
3,289   
4,185   
(82,177)   $

58,907    $
16,016   
4,542   
79,465   
(79,465)  
3,312   
(245)  
(76,398)   $

12,050 
4,030 
(5,894)
10,186 
(10,186)
(23)
4,430 
(5,779)

Research and Development

Research and development expenses increased by $12.1 million, to $71.0 million for the year ended December 31, 2019 from $58.9 million for the year
ended December 31, 2018. The increase was primarily due to increases of $2.3 million for personnel-related expenses, which was partially offset by a decrease of $1.1
million related to non-cash stock compensation expense, $6.7 million for outside research and development activities and $3.1 million in lab and facilities-related costs.

General and Administrative

General  and  administrative  expenses  increased  by  $4.0  million,  to  $20.0  million  for  the  year  ended  December  31,  2019  from  $16.0  million  for  the  year
ended December 31, 2018. The increase was primarily due to increases of $3.4 million for personnel-related expenses, of which $2.5 million was related to non-cash
stock compensation expense, and $0.6 million in insurance-related expense partially offset by $0.5 million decrease in professional fees.

94

 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Change in fair value of contingent consideration

Change in fair value of contingent consideration reflects a decrease in the contingent consideration liability of $1.4 million for the year ended December 31,

2019. The decrease in the fair value of contingent consideration was primarily due to changes in our stock price.

Interest Income

Our interest income was $3.3 million for the year ended December 31, 2019, as compared to $3.3 million for the year ended December 31, 2018.

Other Income (Expense), Net

Other income of $4.1 million for the year ended December 31, 2019 was primarily due to a change in the fair value of our investment in the common stock
of  Ascentage  International.  In  October  2019,  Ascentage  International  completed  an  initial  public  offering  of  shares  of  its  common  stock  on  the  Hong  Kong  stock
exchange which caused a change in our underlying investment resulting in it meeting the definition of an equity security with a readily determinable fair value. The
increase in the fair value of our investment in Ascentage International was due to changes in the quoted stock price following the initial public offering.

Liquidity, Capital Resources and Capital Requirements

Sources of Liquidity

We have incurred net losses each year since inception. We do not have any products approved for sale and have never generated any revenue from product
sales.  Historically,  we  have  incurred  operating  losses  as  a  result  of  ongoing  efforts  to  develop  our  drug  candidates,  including  conducting  ongoing  research  and
development,  preclinical  studies  and  providing  general  and  administrative  support  for  these  operations.  As  of  December  31,  2020,  we  had  an  accumulated  deficit  of
$339.3  million,  and  we  do  not  expect  positive  cash  flows  from  operations  in  the  foreseeable  future.  We  expect  our  operating  losses  and  net  cash  used  in  operating
activities will increase over at least the next several years as we continue our research and development activities, advance our drug candidates through preclinical and
clinical testing and move into later and more costly stages of drug development, hire personnel and prepare for regulatory submissions and the commercialization of our
drug candidates.

We  have  historically  financed  our  operations  primarily  through  private  placements  of  preferred  stock  and  promissory  notes,  as  well  as  public  equity
issuances,  such  as  our  initial  public  offering  or  IPO  and  more  recently  through  proceeds  from  our  new  Loan  Agreement  and  the  ATM  Offering  Program,  and  will
continue to be dependent upon equity and/or debt financing until we are able to generate positive cash flows from our operations.

In August 2020, we entered into the Loan Agreement with Hercules Capital, Inc. pursuant to a term loan, subject to certain terms and conditions. $25.0
million dollars was advanced to us on the date of execution of the Loan Agreement. The milestones for the remaining tranches have not yet been reached and, as of
December 31, 2020 will not be reached as they were dependent, in whole or in part, upon on the continued advancement in the clinical development of UBX0101 in
patients  with  osteoarthritis  of  the  knee.  We  will  make  interest  only  payments  through  September  1,  2022,  or  extended  to  March  1,  2023  upon  satisfaction  of  certain
milestones, and will then repay the principal balance and interest in equal monthly installments through August 1, 2024.

In June 2019, we filed a Registration Statement on Form S-3, or the Shelf Registration Statement, covering the offering of up to $250.0 million of common
stock, preferred stock, debt securities, warrants and units. The Shelf Registration Statement included an initial prospectus covering the offering, issuance and sale of up to
$75.0 million of our common stock from time to time through the ATM Offering Program. The SEC declared the Shelf Registration Statement effective in June 2019. In
June 2019, we also entered into a sales agreement with Cowen or the June 2019 Sales Agreement, pursuant to which we may sell from time to time, at our option, up to
$75.0 million

95

 
 
 
 
 
 
 
of  our  common  stock  through  the  ATM  Offering  Program  under  which Cowen  acts  as  sales  agent.  During  the  year ended  December  31,  2020,  we  issued  and  sold
5,002,257 shares of our common stock through our ATM Offering Program and received net proceeds of approximately $37.3 million, after deducting commissions and
other offering expenses of $1.3 million. As of December 31, 2020, approximately $9.0 million of ATM Offering Program proceeds remained available to be sold under
our ATM Offering Program.

In  July  2020,  we  filed  an  additional  prospectus  supplement  to  the  Shelf  Registration  Statement,  covering  the  offering,  issuance  and  sale  of  up  to  an
additional $50.0 million of the Company’s common stock from time to time through an additional at-the-market offering under the Securities Act of 1933, as amended,
or the Additional ATM Offering Program. In July 2020, we entered into a second sales agreement with Cowen, or the July 2020 Sales Agreement, to sell an additional
$50.0 million of our shares of common stock through the Additional ATM Offering Program in which Cowen acts as sales agent. As of December 31, 2020, there have
been no shares sold under the Additional ATM Offering Program.

Future Funding Requirements

To date we have not generated any revenue from contracts with customers. We expect to continue to incur significant losses for the foreseeable future, and
we expect the losses to increase as we continue the development of, and seek regulatory approvals for, our drug candidates, and begin to commercialize any approved
products.  We  are  subject  to  all  of  the  risks  typically  related  to  the  development  of  new  drug  candidates,  and  we  may  encounter  unforeseen  expenses,  difficulties,
complications, delays and other unknown factors that may adversely affect our business. Moreover, following the completion of our IPO, we began to incur additional
ongoing costs associated with operating as a public company. We anticipate that we will need substantial additional funding in connection with our continuing operations.

Until we can generate a sufficient amount of revenue from the commercialization of our drug candidates or from collaborative agreements with third parties,
if ever, we expect to finance our future cash needs through various means. Additional capital may be raised through the sale of our equity securities, incurring debt,
entering into licensing or collaboration agreements with partners, receiving research contributions, grants or other sources of financing to fund our operations. There can
be no assurance that sufficient funds will be available to us on attractive terms or at all. If we are unable to obtain additional funding from these or other sources, it may
be necessary to significantly reduce our rate of spending through reductions in staff and delaying, scaling back, or stopping certain research and development programs.
Insufficient liquidity may also require us to relinquish rights to drug candidates at an earlier stage of development or on less favorable terms than we would otherwise
choose.

Since our inception, we have incurred significant losses and negative cash flows from operations. We have an accumulated deficit of $339.3 million through
December 31, 2020. We expect to incur substantial additional losses in the future as we conduct and expand our research and development activities. We believe that our
existing cash, cash equivalents and marketable securities will be sufficient to enable us to fund our projected operations through at least the next 12 months from the date
of the issuance of our financial statements included in this Annual Report on Form 10-K.

Based on our current operating plans, we expect our existing capital resources will fund our planned operating expenses into the second half of 2022, which
is  expected  to  fund  key  clinical  data  readouts  for  UBX1325. We  have  based  our  projections  of  operating  capital  requirements  on  assumptions  that  may  prove  to  be
incorrect  and  we  may  use  all  our  available  capital  resources  sooner  than  we  expect.  Because  of  the  numerous  risks  and  uncertainties  associated  with  research,
development and commercialization of biotechnology products, we are unable to estimate the exact amount of our operating capital requirements. Our future funding
requirements will depend on many factors, including, but not limited to:

•

the scope, progress, results and costs of researching and developing our drug candidates, and conducting preclinical studies and clinical studies, including our
ongoing Phase 1 safety and tolerability study of UBX1325, which we recently initiated, and our additional planned clinical studies in our ophthalmology
program;

96

 
 
 
 
 
 
 
•

•

•

•

•

•

•

•

•

•

•

•

•

the timing of, and the costs involved in, obtaining regulatory approvals for our lead drug candidates or any future drug candidates;

potential delays in or cost increases associated with our ongoing or planned preclinical studies or clinical trials as a result of the COVID-19 pandemic;

the number and characteristics of any additional drug candidates we develop or acquire;

the timing and amount of any milestone payments we are required to make pursuant to our license agreements;

the cost of manufacturing our lead drug candidates or any future drug candidates and any products we successfully commercialize;

the cost of building a sales force in anticipation of product commercialization;

the  cost  of  commercialization  activities  if  our  lead  drug  candidates  or  any  future  drug  candidates  are  approved  for  sale,  including  marketing,  sales  and
distribution costs;

our ability to establish and maintain strategic collaborations, licensing or other arrangements and the financial terms of any such agreements, including the
timing and amount of any future milestone, royalty or other payments due under any such agreement;

any product liability or other lawsuits related to our products;

the expenses needed to attract, hire and retain skilled personnel;

the costs associated with being a public company;

the costs involved in preparing, filing, prosecuting, maintaining, defending and enforcing our intellectual property portfolio; and

the timing, receipt and amount of sales of any future approved or cleared products, if any.

Cash Flows

The following table sets forth a summary of the primary sources and uses of cash and restricted cash for each of the periods presented below (in thousands):

Cash used in operating activities
Cash provided by (used in) investing activities
Cash provided by financing activities

Net increase (decrease) in cash and
   restricted cash

Operating Activities

  $

2020

Year Ended December 31,
2019

(78,333)   $
(5,208)  
63,875   

(72,421)   $
67,953   
27,438   

2018

(56,623)
(72,206)
136,930 

  $

(19,666)   $

22,970    $

8,101

Cash used in operating activities of $78.3 million for the year ended December 31, 2020 consisted primarily of a net loss of $93.8 million adjusted for net
non-cash charges of $20.1 million and net changes to our operating assets and liabilities of $4.6 million. Our non-cash charges consisted primarily of $13.8 million in
stock-based  compensation,  $3.4  million  in  depreciation  and  amortization,  $2.6  million  in  impairment  charges  pertaining  to  leasehold  improvements  and  right  of  use
assets in the Company’s former offices, $1.2 million in common stock

97

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
granted to a third party, $0.3 million in amortization of debt issuance costs and $0.3 million in net accretion and amortization of premium and discounts on marketable
securities, partially offset by a $1.1 million in non-cash rent expense and $0.5 million change in fair value of strategic investment. The net change in our operating assets
and  liabilities  consisted  of  decreases  of  $2.6  million  in  accounts  payable,  $0.9  million  in  accrued  liabilities  and  other  current  liabilities,  $0.5  million  in  accrued
compensation and increase of $1.2 million in prepaid expenses and other current assets, partially offset by a decrease of $0.6 million in other long-term assets.

Cash used in operating activities of $72.4 million for the year ended December 31, 2019 consisted primarily of a net loss of $82.2 million adjusted for net
non-cash charges of $6.2 million and net changes to our operating assets and liabilities of $3.6 million. Our non-cash charges consisted primarily of $10.9 million in
stock-based compensation, $2.7 million in depreciation and amortization and $1.0 million in common stock granted to a third party, partially offset by a $1.4 million
change in fair value of contingent consideration, $1.3 million in accretion of our tenant improvement allowance and $1.2 million in net accretion and amortization of
premium  and  discounts  on  marketable  securities.  The  net  change  in  our  operating  assets  and  liabilities  consisted  of  increases  of  $2.5  million  in  deferred  rent,  net  of
current portion, and $2.1 million in accrued compensation, partially offset by a decreases of $0.6 million in accrued liabilities and other current liabilities, $0.2 million in
accounts payable and a $0.2 million increase in prepaid expenses and other current assets.

Cash used in operating activities of $56.6 million for the year ended December 31, 2018 consisted primarily of a net loss of $76.4 million adjusted for net
non-cash charges of $14.6 million and net changes to our operating assets and liabilities of $5.1 million. Our non-cash charges consisted primarily of $9.4 million in
stock-based  compensation,  $4.5  million  change  in  fair  value  of  contingent  consideration  and  $2.2  million  in  depreciation  and  amortization,  partially  offset  by  a  $1.0
million in amortization of premium and discounts on marketable securities and $0.6 million in accretion of our tenant improvement allowance. The net change in our
operating  assets  and  liabilities  consisted  of  a  decrease  of  $1.4  million  in  contribution  receivable,  and  increases  of  $2.2  million  in  accounts  payable,  $1.6  million  in
accrued compensation and $1.4 million in accrued liabilities and other current liabilities, partially offset by an increase of $0.6 million in other long-term assets and $0.8
million in prepaid expenses and other current assets.

Investing Activities

Cash used in investing activities of $5.2 million for the year ended December 31, 2020 was related to purchases of marketable securities of $138.5 million
and  purchases  of  property  and  equipment  of  $0.6  million,  which  were  offset  by  maturities  of  marketable  securities  of  $127.9  million  and  the  sale  of  our  strategic
investment of $6.0 million.

Cash provided by investing activities of $68.0 million for the year ended December 31, 2019 was related to maturities of marketable securities of $188.8

million which were offset by purchases of marketable securities of $119.3 million and purchases of property and equipment of $1.6 million.

Cash used in investing activities of $72.2 million for the year ended December 31, 2018 was related to purchases of marketable securities of $204.1 million,
purchases of property and equipment of $1.3 million and the purchase of an investment in stock of $0.5 million, which were offset by maturities of marketable securities
of $133.6 million.

Financing Activities

Cash  provided  by  financing  activities  of  $63.9  million  for  the  year  ended  December  31,  2020  was  related  to  $37.3  million  in  proceeds  from  the  sale  of
common stock through our ATM Offering Program, net of issuance costs, $24.2 million in proceeds from long-term debt, net of issuance costs, $1.5 million in proceeds
from  issuance  of  common  stock  upon  exercise  of  stock  options,  net  of  repurchases,  $0.6  million  in  proceeds  from  the  issuance  of  common  stock  under  the  2018
Employee Stock Purchase Plan, and $0.4 million in proceeds from the repayment of promissory notes from an employee.

98

 
Cash provided by financing activities of $27.4  million  for  the  year  ended  December  31,  2019  was  related  to  $26.1  million  in  proceeds  from  the  sale  of
common stock through our ATM Offering Program, net of issuance costs, $0.8 million in proceeds from the issuance of common stock under the 2018 Employee Stock
Purchase Plan and proceeds from issuance of common stock upon exercise of stock options, net of repurchases, of $0.6 million.

Cash  provided  by  financing  activities  of  $136.9  million  for  the  year  ended  December  31,  2018  was  primarily  related  to  net  proceeds  from  our  sale  of
common stock in our IPO of $75.9 million, net proceeds from issuance of Series C convertible preferred stock of $59.9 million, proceeds from repayment of recourse
notes of $0.9 million, and proceeds from issuance of common stock upon exercise of stock options, net of repurchases of $0.4 million.

Contractual Obligations and Other Commitments

Our  contractual  obligations  and  commitments  relate  primarily  to  our  Loan  Agreement,  operating  leases  and  non-cancelable  purchase  obligations  under
agreements with various research and development organizations and suppliers in the ordinary course of business. In February 2019, we entered into a lease agreement
for  new  office  and  laboratory  space  in  South  San  Francisco,  California.  See  Note  7,  “Commitments  and  Contingencies”  and  Note  8,  “Term  Loan  Facility,”  to  our
financial statements for further information.

We are party to various license agreements pursuant to which we have in-licensed rights to various technologies, including patents, research “know-how”
and proprietary research tools, for the discovery, research, development and commercialization of drug candidates to treat age-related diseases. The license agreements
obligate us to make certain milestone payments related to specified clinical development and sales milestone events, as well as tiered royalties in the low-single digits
based on sales of licensed products. See Note 5 to our financial statements “License Agreements” for additional information.

Indemnification

In the normal course of business, we enter into contracts and agreements that contain a variety of representations and warranties and provide for general
indemnifications. Our exposure under these agreements is unknown because it involves claims that may be made against us in the future but have not yet been made. To
date, we have not paid any claims or been required to defend any action related to our indemnification obligations. However, we may record charges in the future as a
result of these indemnification obligations.

In  accordance  with  our  certificate  of  incorporation  and  bylaws,  we  have  potential  indemnification  obligations  to  our  officers  and  directors  for  specified
events or occurrences, subject to some limits, while they are serving at our request in such capacities. There have been no claims to date, and we have director and officer
insurance that may enable us to recover a portion of any amounts paid for future potential claims.

Off-Balance Sheet Arrangements

We have not entered into any off-balance sheet arrangements.

Critical Accounting Policies and Estimates

This  discussion  and  analysis  of  our  financial  condition  and  results  of  operations  is  based  on  our  financial  statements,  which  have  been  prepared  in
accordance with accounting principles generally accepted in the United States (“GAAP”). The preparation of these financial statements requires us to make estimates and
assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements, as well
as  the  reported  expenses  incurred  during  the  reporting  periods.  These  items  are  monitored  and  analyzed  by  us  for  changes  in  facts  and  circumstances,  and  material
changes in these estimates could occur in the future. Our estimates are based on our historical experience and on various other factors that we believe are reasonable
under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from
other sources. Changes in estimates are reflected in reported results for the period in which they become known. Actual results may differ from these estimates under
different assumptions or conditions.

99

 
While  our  significant  accounting  policies  are  described  in  more  detail  in  the  notes  to  our  financial  statements  included  elsewhere  in  this  prospectus,  we
believe that the following accounting policies are critical to understanding our historical and future performance, as these policies relate to the more significant areas
involving management’s judgments and estimates.

Research and Development Expenses and Accruals

Costs  related  to  research  and  development  of  drug  candidates  are  charged  to  research  and  development  expense  as  incurred.  Research  and  development
costs  include,  but  are  not  limited  to,  payroll  and  personnel  expenses  for  personnel  contributing  to  research  and  development  activities,  laboratory  supplies,  outside
services,  licenses  acquired  to  be  used  in  research  and  development,  manufacturing  of  clinical  material,  pre-clinical  testing  and  consultants  and  allocated  overhead,
including rent, equipment, depreciation and utilities. Research and development costs are expensed as incurred unless there is an alternative future use in other research
and development projects. Payments made prior to the receipt of goods or services to be used in research and development are deferred and recognized as expense in the
period in which the related goods are received or services are rendered. Such payments are evaluated for current or long-term classification based on when they will be
realized.

As  part  of  the  process  of  preparing  our  financial  statements,  we  are  required  to  estimate  expenses  resulting  from  our  obligations  under  contracts  with
vendors and consultants and clinical site agreements in connection with conducting clinical trials. The financial terms of these contracts are subject to negotiations which
vary from contract to contract and may result in payment flows that do not match the periods over which materials or services are provided under such contracts. Our
objective is to reflect the appropriate expenses in our financial statements by matching those expenses with the period in which services and efforts are expended. We
account  for  these  expenses  according  to  the  progress  of  the  production  of  clinical  trial  materials  or  based  on  progression  of  the clinical trial, as measured by patient
progression and the timing of various aspects of the trial. We determine accrual estimates by taking into account discussion with applicable personnel and outside service
providers as to the progress or state of consummation of goods and services, or the services completed. During the course of a clinical trial, we adjust the rate of expense
recognition if actual results differ from our estimates. We make estimates of accrued expenses as of each balance sheet date in our financial statements based on the facts
and circumstances known at that time. Our clinical trial accrual is dependent in part upon the timely and accurate reporting of contract research organizations, contract
manufacturers and other third-party vendors. Although we do not expect our estimates to be materially different from amounts actually incurred, our understanding of the
status and timing of services performed relative to the actual status and timing of services performed may vary and may result in our reporting changes in estimates in
any particular period. Adjustments to prior period estimates have not been material for the years ended December 31, 2020 and 2019.

We have and may continue to enter into license agreements to access and utilize certain technology. We evaluate if the license agreement is an acquisition of
an asset or a business. To date none of our license agreements have been considered to be an acquisition of a business. For asset acquisitions, the upfront payments to
acquire such licenses, as well as any future milestone payments made before product approval, are immediately recognized as research and development expense when
due,  provided  there  is  no  alternative  future  use  of  the  rights  in  other  research  and  development  projects.  These  license  agreements  may  also  include  contingent
consideration in the form of cash and additional issuances of our common stock.

Contingent Consideration Liability

We have entered into license agreements to access and utilize certain intellectual property and technology and may enter into additional license agreements
in the future. In each case, we evaluate if the license agreement results in the acquisition of an asset or a business. To date, none of our license agreements have been
considered an acquisition of a business. If a license agreement is deemed to constitute an asset acquisition, the upfront payments to acquire such licenses, as well as any
future milestone payments made before product approval, are immediately recognized as research and development expense when due, provided there is no alternative
future use of the rights in other research and development projects. Several of our license agreements also include contingent consideration in the form of an obligation to
issue additional shares of our common stock if we achieve certain milestones. For contingent consideration related to our asset acquisitions, we assess on a continuous
basis whether the contingent consideration meets the definition of a derivative and/or whether it can be classified within stockholders’ equity, until such time that equity
classification criteria are met or the milestones expire. The derivative related to the

100

 
contingent consideration arising from our license agreements is measured at fair value as of each balance sheet date with the related change in fair value being reflected
in operating expenses.  Upon  a  reassessment  event  that  results  in  the  contingent  consideration  no  longer  meeting  the  definition  of  a  derivative  and/or  meeting  equity
classification criteria, the final change in fair value of the instrument is recorded within operating expenses and the liability is reclassified into stockholders’ equity.

Stock-Based Compensation

We  recognize  compensation  costs  related  to  stock-based  awards  granted  based  on  the  estimated  fair  value  of  the  awards  on  the  date  of  grant,  and  we
recognize forfeitures as they occur. For awards that vest solely based on service conditions or a combination of service and performance conditions, we estimate the grant
date fair value, and the resulting stock-based compensation expense, using the Black-Scholes option-pricing model. The grant date fair value of the awards is generally
recognized on a straight-line basis over the requisite service period, which is typically their vesting period. We recognize forfeitures as they occur.

Prior to our IPO, the fair value of our shares of common stock underlying the stock options was the responsibility of and determined by our Board. Because
there was no public market for our common stock, the Board determined the fair value of common stock at the time of grant of the option by considering a number of
objective  and  subjective  factors,  including,  among  others:  the  prices  at  which  we  sold  shares  of  our  convertible  preferred  stock  to  outside  investors  in  arms-length
transactions; the rights, preferences and privileges of our convertible preferred stock relative to those of our common stock; our results of operations, financial position and
capital resources; current business conditions and projections; the lack of marketability of our common stock; the hiring of key personnel and the experience of management;
progress of our research and development activities; our stage of development and material risks related to its business; the fact that the stock option grants involve illiquid
securities in a private company; and the likelihood of achieving a liquidity event, such as an initial public offering or sale, in light of prevailing market conditions.

Following the IPO, the market traded price of the shares of common stock underlying the stock-based awards is the fair value of our stock as reported on

The Nasdaq Global Select Market on the grant date.

The  Black-Scholes  option-pricing  model  requires  the  use  of  highly  subjective  assumptions  to  determine  the  fair  value  of  stock-based  awards.  These

assumptions include:

•

•

•

•

Expected  term—The  expected  term  represents  the  period  that  the  stock-based  awards  are  expected  to  be  outstanding.  We  use,  due  to  insufficient
historical data, the simplified method to determine the expected term, which is based on the average of the time-to-vesting and the contractual life of
the options.

Expected  volatility—Due  to  our  limited  trading  history  for  our  common  stock,  the  expected  volatility  is  estimated  based  on  the  average  historical
volatilities of common stock of comparable publicly traded entities over a period equal to the expected term of the stock option grants. The comparable
companies are chosen based on their size, stage in the product development cycle or area of specialty. We will continue to apply this process until a
sufficient amount of historical information regarding the volatility of our own stock price becomes available.

Risk-free interest rate—The risk-free interest rate is based on the U.S. Treasury yield in effect at the time of grant for zero-coupon U.S. Treasury notes
with maturities approximately equal to the expected term of the awards.

Expected dividend—We have never paid dividends on our common stock and have no plans to pay dividends on our common stock. Therefore, we
used an expected dividend yield of zero.

We have also granted stock options to certain key employees that vest in conjunction with certain performance and market conditions. We estimate the fair
value of these awards using a lattice model, taking into consideration the market conditions. No expense will be recorded related to these awards until the achievement of
the performance condition becomes probable. Once the achievement of the performance condition becomes probable, expense related to these awards is recognized using
the accelerated attribution method with a cumulative

101

 
 
 
 
 
catch-up adjustment over the derived service period relating to the market conditions, if the market conditions have not been met. As these awards vest in their entirety
upon achievement of the market conditions, any unrecognized expense would be accelerated if the market conditions are achieved prior to the completion of the derived
service period. The Company has also used the Monte-Carlo option-pricing model to estimate the fair value of stock option awards that contain only market conditions.
The Monte-Carlo option pricing model uses similar input assumptions as the Black-Scholes model; however, it further incorporates into the fair-value determination the
possibility that the market condition may not be satisfied.

As of December 31, 2020, we had $25.1 million of unrecognized compensation expense related to unvested stock options and restricted stock units, which is
expected to be recognized over an estimated weighted-average period of 3.25 years. For stock-based awards subject to ratable vesting, we recognize compensation cost
on  a  straight-line  basis  over  the  service  period  for  the  entire  award.  In  future  periods,  our  stock-based  compensation  expense  is  expected  to  increase  as  a  result  of
recognizing  our  existing  unrecognized  stock-based  compensation  for  awards  that  will  vest  and  as  we  issue  additional  stock-based  awards  to  attract  and  retain  our
employees.

JOBS Act Accounting Election

We are an emerging growth company, as defined in the JOBS Act. Under the JOBS Act, emerging growth companies can delay adopting new or revised
accounting standards issued subsequent to the enactment of the JOBS Act until such time as those standards apply to private companies. We have irrevocably elected to
avail ourselves of this exemption from new or revised accounting standards and, therefore, will not be subject to the same new or revised accounting standards as other
public  companies  that  are  not  emerging  growth  companies.  We  also  rely  on  other  exemptions  provided  by  the  JOBS  Act,  including,  without  limitation,  providing  an
auditor’s attestation report on our system of internal controls over financial reporting pursuant to Section 404(b) of the Sarbanes-Oxley Act. We will remain an emerging
growth company until the earlier of (1) the last day of the year following the fifth anniversary of the consummation of our IPO, (2) the last day of the year in which we
have total annual gross revenue of at least $1.07 billion, (3) the last day of the year in which we are deemed to be a “large accelerated filer” as defined in Rule 12b-2
under the Exchange Act, which would occur if the market value of our common stock held by non-affiliates exceeded $700.0 million as of the last business day of the
second fiscal quarter of such year or (4) the date on which we have issued more than $1.0 billion in non-convertible debt securities during the prior three-year period.
Even after we no longer qualify as an emerging growth company, we may still qualify as a “smaller reporting company” which may allow us to take advantage of many
of the same exemptions from disclosure requirements including not being required to comply with the auditor attestation requirements of Section 404(b) of the Sarbanes-
Oxley Act.

Recent Accounting Pronouncements

See Note 2 to our Financial Statements “Summary of Significant Accounting Policies” for information.

Item 7A. Quantitative and Qualitative Disclosures About Market Risk.

Cash, Cash Equivalents and Marketable Securities

We  are  exposed  to  market  risks  in  the  ordinary  course  of  our  business.  These  risks  primarily  relate  to  interest  rate  sensitivities.  We  had  cash,  cash  equivalents  and
marketable securities of $115.6 million as of December 31, 2020, which consist of bank deposits, money market funds, and marketable securities. The primary objective
of  our  investment  activities  is  to  preserve  capital  to  fund  our  operations.  We  also  seek  to  maximize  income  from  our  investments  without  assuming  significant  risk.
Because our investments are primarily short-term in duration, we believe that our exposure to interest rate risk is not significant, and a 1% movement in market interest
rates would not have a significant impact on the total value of our portfolio.

102

 
 
Interest Rate Risk

As of December 31, 2020, the outstanding principal amount of the term loan under the Hercules Loan Agreement was $25.0 million. The interest payments
under our term loan may be subject to interest rate risk and our interest expense could increase if market interest rates increase. The interest on the term loan accrues at a
per annum rate of the greater of (i) the Wall Street Journal prime rate plus 6.10% and (ii) 9.35%. Accordingly, increases in these published rates would increase our
interest payments under the term loans. The effective interest rate at December 31, 2020 was 12.40%. A hypothetical 1% change in interest rates would increase expense
by approximately $0.2 million annually and would not have a material impact on our results of operations.

103

 
Item 8. Financial Statements and Supplementary Data.

UNITY BIOTECHNOLOGY, INC.
Index to Financial Statements

Report of Independent Registered Public Accounting Firm

Balance Sheets

Statements of Operations and Comprehensive Loss

Statements of Convertible Preferred Stock and Stockholders’ Equity (Deficit)

Statements of Cash Flows

Notes to the Financial Statements

104

Page

105

106

107

108

109

110

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Report of Independent Registered Public Accounting Firm

To the Stockholders and the Board of Directors of
Unity Biotechnology, Inc.

Opinion on the Financial Statements

We  have  audited  the  accompanying  balance  sheets  of  Unity  Biotechnology,  Inc.  (“the  Company”)  as  of  December  31,  2020  and  2019,  and  related  statements  of
operations and comprehensive loss, convertible preferred stock and stockholders’ equity (deficit) and cash flows for each of the three years in the period ended December
31, 2020, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the
financial position of the Company at December 31, 2020 and 2019 and the results of its operations and its cash flows for each of the three years in the period ended
December 31, 2020, in conformity with U.S. generally accepted accounting principles.

Adoption of New Accounting Standard

As  discussed  in  Note  2  to  the  financial  statements,  the  Company  changed  its  method  of  accounting  for  leases  in  2020  due  to  the  adoption  of  Accounting  Standard
Updated (“ASU”) No. 2016-02, Leases (Topic 842), effective January 1, 2020, using the modified retrospective approach.

Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based
on  our  audits.  We  are  a  public  accounting  firm  registered  with  the  Public  Company  Accounting  Oversight  Board  (United  States)  (PCAOB)  and  are  required  to  be
independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange
Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance
about whether the financial statements are free of material misstatement, whether due to error or fraud. The Company is not required to have, nor were we engaged to
perform,  an  audit  of  its  internal  control  over  financial  reporting.  As  part  of  our  audits  we  are  required  to  obtain  an  understanding  of  internal  control  over  financial
reporting but not for the purpose of expressing an opinion on the effectiveness of the Company’s internal control over financial reporting. Accordingly, we express no
such opinion.

Our  audits  included  performing  procedures  to  assess  the  risks  of  material  misstatement  of  the  financial  statements,  whether  due  to  error  or  fraud,  and  performing
procedures that respond to those risks. Such procedures include examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements.
Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the
financial statements. We believe that our audits provide a reasonable basis for our opinion.

/s/ Ernst & Young LLP

We have served as the Company’s auditor since 2017.

Redwood City, California
March 23, 2021

105

 
UNITY BIOTECHNOLOGY, INC.
Balance Sheets
(in thousands, except for share amounts and par value)

Assets
Current assets:

Cash and cash equivalents
Short-term marketable securities
Strategic investment
Prepaid expenses and other current assets

Total current assets

Property and equipment, net
Operating lease right-of-use assets
Long-term marketable securities
Restricted cash
Other long-term assets

Total assets

Liabilities and Stockholders’ Equity
Current liabilities:

Accounts payable
Accrued compensation
Accrued and other current liabilities
Contingent consideration liability

Total current liabilities
Operating lease liability, net of current portion
Deferred rent, net of current portion
Long-term debt, net
Total liabilities
Commitments and contingencies (Note 7)
Convertible preferred stock, $0.0001 par value; 10,000,000 shares
   authorized; no shares issued and outstanding
Stockholders’ equity:

Common stock, $0.0001 par value; 300,000,000 shares
   authorized as of December 31, 2020 and 2019; 53,253,213
   and 47,227,065 shares issued and outstanding as of
   December 31, 2020 and 2019, respectively
Additional paid-in capital
Related party promissory notes for purchase of common stock
Employee promissory notes for purchase of common stock
Accumulated other comprehensive gain
Accumulated deficit
Total stockholders’ equity
Total liabilities and stockholders’ equity

December 31,

2020

2019

17,807    $
79,892   
—   
3,167   
100,866   
12,627   
23,509   
17,871   
1,446   
—   
156,319    $

2,558    $
5,355   
6,550   
—   
14,463   
34,468   
—   
24,508   
73,439   

37,473 
84,508 
5,507 
1,999 
129,487 
16,636 
— 
3,025 
1,446 
627 
151,221 

5,185 
5,905 
4,995 
1,131 
17,216 
— 
13,298 
— 
30,514 

—   

— 

5   
422,379   
(210)  
—   
5   
(339,299)  
82,880   
156,319    $

5 
366,695 
(210)
(418)
90 
(245,455)
120,707 
151,221

  $

  $

  $

  $

See accompanying notes to the financial statements.

106

 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
UNITY BIOTECHNOLOGY, INC.
Statements of Operations and Comprehensive Loss
(in thousands, except share and per share amounts)

Operating expenses:

Research and development
General and administrative
Change in fair value of contingent consideration
Impairment of long-lived assets

Total operating expenses
Loss from operations
Interest income
Interest expense
Other income (expense), net
Net loss

Other comprehensive loss

Unrealized gain (loss) on marketable debt securities

Comprehensive loss

Net loss per share, basic and diluted

Weighted average number of shares used in computing net loss
   per share, basic and diluted

2020

Year ended December 31,
2019

2018

  $

  $

  $

  $

67,309    $
24,025   
(33)  
2,629   
93,930   
(93,930)  
1,196   
(1,292)  
182   
(93,844)   $

(85)  

(93,929)   $

(1.84)   $

70,957    $
20,046   
(1,352)  
—   
89,651   
(89,651)  
3,289   
—   
4,185   
(82,177)   $

185   

(81,992)   $

(1.88)   $

58,907 
16,016 
4,542 
— 
79,465 
(79,465)
3,312 
— 
(245)
(76,398)

9 

(76,389)

(2.70)

50,864,889   

43,624,807   

28,269,907

See accompanying notes to the financial statements.

107

 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
Balances at December 31, 2017

Issuance of Series C convertible preferred stock at
$15.3317
   per share for cash, net of issuance costs of $119
Issuance of common stock upon initial public offering,
net of
   issuance costs of $9,149
Conversion of Series A-1, A-2, B and C convertible
preferred
   stock to common stock
Issuance of common stock upon exercise of warrants
and
   stock options, net of amount related to early
exercised
   options of $1,212
Vesting of early exercised stock options
Stock-based compensation
Unrealized gain on available-for-sale marketable
securities
Receipt of promissory note from related party for
purchase
   of common stock
Receipt of promissory note from employee for
purchase
   of common stock
Repayment of promissory note from related party
Net loss

Balances at December 31, 2018

Issuance of common stock, net of issuance costs,
under
   at-the-market ("ATM") equity offering program
Issuance of common stock upon exercise of stock
options
Vesting of early exercised stock options
Stock-based compensation
Common stock issued to third parties
Repurchased shares
Issuance of common stock under employee stock
purchase
   plan (“2018 ESPP”)
Unrealized gain on available-for-sale marketable
securities
Net loss

Balances at December 31, 2019

Issuance of common stock, net of issuance costs,
under
   ATM equity offering program
Issuance of common stock upon exercise of stock
options
Issuance of common stock upon vesting of restricted
   stock units
Vesting of early exercised stock options
Stock-based compensation
Common stock issued for services
Common stock issued to third parties for milestone
payments
Repayment of promissory note from employee from
   purchase of common stock
Repayment of promissory note from employee
through
   repurchase of early exercise shares
Issuance of common stock under 2018 ESPP
Unrealized loss on available-for-sale marketable
securities
Net loss

Balances at December 31, 2020

UNITY BIOTECHNOLOGY, INC.
Statements of Convertible Preferred Stock and Stockholders’ Equity (Deficit)
(in thousands, except share amounts)

Convertible
Preferred Stock

Common Stock

Additional

Paid-In  

Shares
28,159,724  

  Amount
  $

173,956  

Shares
4,830,389  

  Amount
  $

1  

  Capital
  $

4,072  

Related Party
Promissory Notes
for Purchase of  
  Common Stock  
(202 )
  $

Employee
Promissory
Notes for
Purchase of
  Common Stock 
—  
  $

Accumulated
Other
Comprehensive 

  Gain (Loss)
  $

(104 )

  Accumulated  
Deficit

  $

(86,880 )

Total
Stockholders’  
  Equity (Deficit) 
(83,113 )
  $

3,913,425  

59,881  

—  

—  

—  

75,851  

233,837  

374  
584  
9,441  

—  

—  

—  
504  
—  
324,663  

  $

  $

26,085  

840  
647  
10,852  
3,022  
—  

586  

—  

—  

5,000,000  

(32,073,149 )  

(233,837 )  

  32,073,149  

—  
—  
—  

—  

—  

—  
—  
—  
—  

—  

—  
—  
—  
—  
—  

—  

—  
—  
—  

—  

—  

—  
—  
—  
—  

—  

—  

—  
—  

—  
—  
—  

  $

  $

  $

—  
—  
—  

—  

—  

—  
—  
—  
—  

—  

—  
—  
—  
—  
—  

—  

—  
—  
—  

—  

—  

—  
—  
—  
—  

—  

—  

—  
—  

—  
—  
—  

510,756  
—  
—  

—  

—  

—  
—  
—  
  42,414,294  

  $

3,974,908  

505,226  
—  
—  
253,334  

(4,281 )  

83,584  

—  
—  
  47,227,065  

  $

5,002,257  

410,484  

103,020  
—  
—  
43,550  

361,644  

—  

(12,909 )  
118,102  

—  
—  
  53,253,213  

  $

1  

2  

—  
—  
—  

—  

—  

—  
—  
—  
4  

1  

—  
—  
—  
—  
—  

—  

—  
—  
5  

—  

—  

—  
—  
—  
—  

—  

—  

—  
—  

—  
—  
5  

—  
—  
366,695  

  $

  $

—  
—  
(210 )

  $

37,270  

1,510  

—  
216  
13,746  
100  

2,310  

—  

(44 )  
576  

—  

—  

—  
—  
—  
—  

—  

—  

—  
—  

—  
—  
422,379  

  $

  $

—  
—  
(210 )

  $

—  

—  

—  

—  
—  
—  

—  

—  

(400 )
—  
—  
(400 )

  $

  $

—  

—  

—  

—  
—  
—  

—  

(390 )

—  
391  
—  
(201 )

—  

—  
—  
—  
(9 )
—  

—  

—  

—  
—  
—  
(18 )
—  

—  

—  
—  
(418 )

—  

—  

—  
—  
—  
—  

—  

374  

44  
—  

—  
—  
—  

  $

  $

See accompanying notes to the financial statements

108

—  

—  

—  

—  
—  
—  

9  

—  

—  
—  
—  
(95 )

—  

—  
—  
—  
—  
—  

—  

185  
—  
90  

—  

—  

—  
—  
—  
—  

—  

—  

—  
—  

(85 )
—  
5  

—  

—  

—  

—  
—  
—  

—  

—  

—  

75,852  

233,839  

374  
584  
9,441  

9  

(390 )

—  
—  
(76,398 )
(163,278 )

  $

  $

(400 )
895  
(76,398 )
160,693  

—  

—  
—  
—  
—  
—  

—  

—  
(82,177 )
(245,455 )

  $

  $

—  

—  

—  
—  
—  
—  

—  

—  

—  
—  

—  
(93,844 )
(339,299 )

  $

  $

26,086  

840  
647  
10,852  
2,995  
—  

586  

185  
(82,177 )
120,707  

37,270  

1,510  

—  
216  
13,746  
100  

2,310  

374  

—  
576  

(85 )
(93,844 )
82,880  

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
UNITY BIOTECHNOLOGY, INC.
Statements of Cash Flows
(in thousands)

Operating activities
Net loss
Adjustments to reconcile net loss to net cash used in operating activities:

Depreciation and amortization
Amortization of debt issuance costs
Net accretion and amortization of premium and discounts on marketable securities
Stock-based compensation
Loss on disposal of property and equipment
Common stock issued to third parties
Non-cash rent expense
Impairment of long-lived assets
Change in fair value of strategic investment
Accretion of tenant improvement allowance
Change in fair value of contingent consideration
Changes in operating assets and liabilities:

Contribution receivable
Prepaid expenses and other current assets
Other long-term assets
Accounts payable
Accrued compensation
Accrued liabilities and other current liabilities
Deferred rent, net of current portion

Net cash used in operating activities
Investing activities
Purchase of marketable securities
Maturities of marketable securities
Sale of strategic investments
Purchase of investment in stock
Purchase of property and equipment
Net cash provided by (used in) investing activities
Financing activities
Proceeds from issuance of common stock under ATM offering program,
   net of issuance costs
Proceeds from repayment of employee promissory notes
Proceeds from long-term debt, net of issuance costs to lender
Payment of long-term debt non-lender issuance costs
Proceeds from issuance of convertible preferred stock, net of issuance costs
Proceeds from issuance of common stock upon exercise of stock options,
   net of repurchases
Proceeds from issuance of common stock under the 2018 ESPP
Proceeds from initial public offering, net of issuance costs
Payment of initial public offering costs
Proceeds from repayment of recourse notes
Payments made on capital lease obligations
Net cash provided by financing activities
Net increase (decrease) in cash, cash equivalents and restricted cash
Cash, cash equivalents and restricted cash at beginning of year
Cash, cash equivalents and restricted cash at end of year
Supplemental Disclosures of Cash Flow Information:
Cash paid for interest
Supplemental Disclosures of Non-Cash Investing and Financing Activities
Property and equipment included in accounts payable
Issuance of common stock in settlement of contingent consideration milestone
Issuance of shares in settlement of share-based liability
Right-of-use assets obtained in exchange for new operating lease liabilities
Lessor funded lease incentives included in property and equipment
Receipt of promissory note for purchase of common stock
Receipt of promissory note from related party for purchase of common stock

2020

Year Ended December 31,
2019

2018

  $

(93,844)   $

(82,177)   $

(76,398)

3,449 
318 
256 
13,813 
— 
1,211 
(1,076)  
2,629 
(502)  
— 
(33)  

— 
(1,168)  
628 
(2,640)  
(517)  
(857)  
— 

(78,333)  

(138,486)  
127,915 
6,009 
— 
(646)  
(5,208)  

37,270 
374 
24,550 

(360)  
— 

1,510 
576 
— 
— 
— 
(45)  

63,875 
(19,666)  
38,919 
19,253 

  $

2,663 
— 
(1,151)  
10,852 
— 
965 
— 
— 
(4,507)  
(1,275)  
(1,352)  

— 
(169)  
(31)  
(227)  
2,114 
(587)  
2,461 
(72,421)  

(119,270)  
188,809 
— 
— 
(1,586)  
67,953 

26,085 
— 
— 
— 
— 

840 
586 
— 
— 
— 
(73)  

27,438 
22,970 
15,949 
38,919 

  $

773 

  $

— 

  $

13 
1,098 
100 
27,714 
— 
— 
— 

  $
  $
  $
  $
  $
  $
  $

565 
— 
— 
— 
10,651 
— 
27 

  $
  $
  $
  $
  $
  $
  $

2,180 
— 
(955)
9,441 
45 
— 
— 
— 
— 
(605)
4,542 

1,382 
(842)
(604)
2,228 
1,610 
1,446 
(93)
(56,623)

(204,086)
133,644 
— 
(500)
(1,264)
(72,206)

— 
— 
— 
— 
59,881 

374 
— 
79,055 
(3,201)
895 
(74)
136,930 
8,101 
7,848 
15,949 

— 

241 
— 
— 
— 
— 
400 
390  

  $

  $

  $
  $
  $
  $
  $
  $
  $

See accompanying notes to the financial statements.

109

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
  
 
 
  
 
 
  
 
 
  
 
 
  
 
UNITY BIOTECHNOLOGY, INC.
NOTES TO THE FINANCIAL STATEMENTS

1. Organization

Description of Business

Unity Biotechnology, Inc. (the “Company”) is a biotechnology company engaged in the research and development of therapeutics to slow, halt, or reverse diseases of
aging. The Company devotes substantially all of its time and efforts to performing research and development, raising capital and recruiting personnel. The Company’s
headquarters are located in South San Francisco, California. The Company was incorporated in the State of Delaware in 2009 and operates in one segment.

Liquidity

The  Company  has  incurred  operating  losses  and  has  an  accumulated  deficit  as  a  result  of  ongoing  efforts  to  develop  drug  product  candidates,  including  conducting
preclinical and clinical trials and providing general and administrative support for these operations. The Company had an accumulated deficit of $339.3 million as of
December 31, 2020. During the year ended December 31, 2020, the Company incurred a net loss of $93.8 million and used $78.3 million of cash in operating activities.
To date, none of the Company’s drug candidates have been approved for sale, and therefore, the Company has not generated any revenue from contracts with customers
and  does  not  expect  positive  cash  flows  from  operations  in  the  foreseeable  future.  The  Company  has  financed  its  operations  primarily  through  private  placements  of
preferred stock and promissory notes, public equity issuances and more recently, from its ATM Offering Program (as defined below) and the Term Loan Facility (as
defined below), and will continue to be dependent upon equity and/or debt financing until the Company is able to generate positive cash flows from its operations. See
Note 8, “Term Loan Facility”.

The Company had cash, cash equivalents and marketable securities of $115.6 million as of December 31, 2020. The Company has evaluated and concluded there are no
conditions  or  events,  considered  in  the  aggregate,  that  raise  substantial  doubt  about  the  Company’s  ability  to  continue  as  a  going  concern  for  a  period  of  12  months
following the date that these financial statements are issued. Management expects operating losses to continue for the foreseeable future. As a result, the Company will
need to raise additional capital. If sufficient funds on acceptable terms are not available when needed, the Company could be required to significantly reduce its operating
expenses and delay, reduce the scope of, or eliminate one or more of its development programs. Failure to manage discretionary spending or raise additional financing, as
needed, may adversely impact the Company’s ability to achieve its intended business objectives.

2. Summary of Significant Accounting Policies

Basis of Presentation

These financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) and the rules and
regulations of Securities and Exchange Commission (“SEC”) for reporting.

Use of Estimates

The  preparation  of  financial  statements  in  conformity  with  GAAP  requires  management  to  make  estimates  and  assumptions  that  affect  the  amounts  reported  in  the
financial statements and accompanying notes. The Company bases its estimates on historical experience and market-specific or other relevant assumptions that it believes
are reasonable under the circumstances. The amounts of assets and liabilities reported in the Company’s balance sheets and the amount of expenses and income reported
for each of the periods presented are affected by estimates and assumptions, which are used for, but are not limited to, determining the fair value of assets and liabilities,
contingent consideration liability, the fair value of right-of-use assets and lease liabilities, and stock-based compensation. Actual results could differ from such estimates
or assumptions.

110

 
 
Segments

The  Company  has  one  operating  segment.  The  Company’s  chief  operating  decision  maker,  its  Chief  Executive  Officer,  manages  the  Company’s  operations  on  a
consolidated basis for the purposes of allocating resources.

Cash, Cash Equivalents and Restricted Cash

The  Company  considers  all  highly  liquid  investments  with  original  maturities  of  90  days  or  less  from  the  date  of  purchase  to  be  cash  equivalents.  Cash  equivalents
primarily include money market funds that invest in U.S. Treasury obligations which are stated at fair value.

The Company has issued letters of credit under its lease agreements which have been collateralized. This cash is classified as noncurrent restricted cash on the balance
sheet based on the term of the underlying lease.

The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the balance sheets that sum to the total of the same amounts
shown in the statements of cash flows (in thousands).

Cash and cash equivalents
Restricted cash
Total cash, cash equivalents, and restricted cash

Marketable Securities

  $

  $

2020

17,807 
1,446 
19,253 

 $

 $

December 31,
2019

37,473 
1,446 
38,919 

 $

 $

2018

15,399 
550 
15,949

The Company generally invests its excess cash in investment grade, short to intermediate-term, fixed income securities. Such investments are considered available-for-
sale  debt  securities,  and  reported  at  fair  value  with  unrealized  gains  and  losses  included  as  a  component  of  stockholders’  equity  (deficit).  Marketable  securities  with
original maturities of greater than 90 days from the date of purchase but less than one year from the balance sheet date that are available to be converted into cash to fund
current operations are classified as short-term, while marketable securities with maturities in one year or beyond one year from the balance sheet date are classified as
long-term. The amortized cost of debt securities is adjusted for amortization of premiums and accretion of discounts to maturity, which is included in interest income on
the statements of operations and comprehensive loss. Realized gains and losses and declines in value judged to be other-than-temporary, if any, on marketable securities
are included in interest income (expense), net. The cost of securities sold is determined using the specific identification method.

The Company periodically evaluates whether declines in fair values of its marketable securities below their book value are other-than-temporary. This evaluation consists
of several qualitative and quantitative factors regarding the severity and duration of the unrealized loss as well as the Company’s ability and intent to hold the marketable
security until a forecasted recovery occurs. Additionally, the Company assesses whether it has plans to sell the security or it is more likely than not it will be required to
sell any marketable securities before recovery of its amortized cost basis. Factors considered include quoted market prices, recent financial results and operating trends,
implied values from any recent transactions or offers of investee securities, credit quality of debt instrument issuers, other publicly available information that may affect
the value of the marketable security, duration and severity of the decline in value, and management’s strategy and intentions for holding the marketable security. To date,
the Company has not recorded any impairment charges on its marketable securities related to other-than-temporary declines in market value.

Strategic Investments

The Company has previously made investments in strategic partners and may do so again in the future. The Company does not intend to have a controlling interest or
significant influence when it makes these strategic investments. Investments in equity securities of strategic partners with readily determinable fair values are measured
using quoted market prices, with changes recorded through other income (expense), net in the statement of operations and comprehensive loss.

111

 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
Fair Value Measurements

The  Company’s  financial  instruments  during  the  periods  presented  consist  of  cash  and  cash  equivalents,  restricted  cash,  marketable  securities,  strategic  investments,
prepaid expenses and other current assets, accounts payable, accrued compensation, accrued and other current liabilities, contingent consideration liabilities, and long-
term debt. Fair value estimates of these instruments are made at a specific point in time, based on relevant market information. These estimates may be subjective in
nature and involve uncertainties and matters of judgment.

Concentrations of Risk

Financial  instruments  that  potentially  subject  the  Company  to  significant  concentrations  of  credit  risk  consist  primarily  of  cash,  cash  equivalents,  restricted  cash  and
marketable  securities.  Substantially  all  of  the  Company’s  cash  and  cash  equivalents  and  restricted  cash  is  deposited  in  accounts  with  financial  institutions  that
management believes are of high credit quality. Such deposits have and will continue to exceed federally insured limits. The Company maintains its cash with accredited
financial institutions and accordingly, such funds are subject to minimal credit risk. The Company has not experienced any losses on its cash deposits.

The Company’s investment policy limits investments in marketable securities to certain types of securities issued by the U.S. government, its agencies and institutions
with investment-grade credit ratings and places restrictions on maturities and concentration by type and issuer. The Company is exposed to credit risk in the event of a
default by the financial institutions holding its cash, cash equivalents, restricted cash and marketable securities and issuers of marketable securities to the extent recorded
on the balance sheets. As of December 31, 2020, the Company had no off-balance sheet concentrations of credit risk.

The Company depends on third-party suppliers for key raw materials used in its manufacturing processes and is subject to certain risks related to the loss of these third-
party suppliers or their inability to supply the Company with adequate raw materials.

In March 2020, the World Health Organization declared the COVID-19 outbreak a pandemic. To date, the Company’s operations have not been significantly impacted by
the COVID-19 pandemic. However, the Company cannot at this time predict the specific extent, duration, or full impact that the COVID-19 pandemic will have on its
financial condition and results of operations, including ongoing and planned clinical studies. The impact of the COVID-19 pandemic on the financial performance of the
Company will depend on future developments. These developments and the impact of the COVID-19 pandemic on the financial markets and the overall economy are
highly uncertain. The Company continues to monitor the impact the COVID-19 pandemic may have on the clinical development of its product candidates, including
potential delays or modifications to its ongoing and planned studies.

Research and Development Expenses and Accruals

Costs related to research, design and development of drug candidates are charged to research and development expense as incurred. Research and development costs
include, but are not limited to, payroll and personnel expenses for personnel contributing to research and development activities, laboratory supplies, outside services,
licenses acquired to be used in research and development, manufacturing of clinical material, pre-clinical testing and consultants and allocated overhead, including rent,
equipment,  depreciation  and  utilities.  Research  and  development  costs  are  expensed  as  incurred  unless  there  is  an  alternative  future  use  in  other  research  and
development projects. Payments made prior to the receipt of goods or services to be used in research and development are deferred and recognized as expense in the
period in which the related goods are received or services are rendered. Such payments are evaluated for current or long-term classification based on when they will be
realized.

As part of the process of preparing its financial statements, the Company is required to estimate expenses resulting from its obligations under contracts with vendors and
consultants and clinical site agreements in connection with conducting clinical trials. The financial terms of these contracts are subject to negotiations which vary from
contract to contract and may result in payment flows that do not match the periods over which materials or services are provided under such contracts. The Company’s
objective is to reflect the appropriate expenses in its financial statements by matching those expenses with the period in which services and efforts are expended. The
Company accounts for these expenses according to the progress of the production of clinical trial materials or based on progression of the clinical trial, as measured by
patient progression and the timing of various aspects of the trial. The Company determines accrual estimates by taking into account discussion with applicable personnel
and outside service providers as to the progress or state of consummation of goods and services, or the services completed.

112

 
 
During the course of a clinical trial, the rate of expense recognition is adjusted if actual results differ from the Company’s estimates. The Company makes estimates of
accrued expenses as of each balance sheet date in its financial statements based on the facts and circumstances known at that time. The clinical trial accrual is dependent
in part upon the timely and accurate reporting of contract research organizations, contract manufacturers and other third-party vendors. Although the Company does not
expect its estimates to be materially different from amounts actually incurred, its understanding of the status and timing of services performed relative to the actual status
and timing of services performed may vary and may result in reporting changes in estimates in any particular period. Adjustments to prior period estimates have not been
material for the years ended December 31, 2020 and 2019.

Contingent Consideration Liability

The Company has entered into and may continue to enter into, license agreements to access and utilize certain technology. In each case, the Company evaluates whether
the license agreement results in the acquisition of an asset or a business. To date, all of the Company’s license agreements have been considered acquisitions of assets and
none have been considered acquisitions of a business. For license agreements that are considered to be acquisitions of assets, the upfront payments for such license, as
well as any future milestone payments made before product approval, are immediately recognized as research and development expense when due, provided there is no
alternative future use of the rights in other research and development projects. Some of the Company’s license agreements also include contingent consideration in the
form of an obligation to issue additional shares of the Company’s common stock based on the achievement of certain milestones. The Company assesses on a continuous
basis whether (i) such contingent consideration meets the definition of a derivative, and (ii) whether it can be classified within stockholders’ equity. Until such time when
equity  classification  criteria  are  met  or  the  milestones  expire,  the  contingent  consideration  is  classified  as  a  liability.  The  derivative  related  to  this  contingent
consideration is measured at fair value as of each balance sheet date with the related change in fair value being reflected in operating expenses. Upon a reassessment
event that results in the contingent consideration no longer meeting the definition of a derivative and/or meeting equity classification criteria, the final change in fair
value of the instrument is recorded within operating expenses and the liability is reclassified into stockholders’ equity.

Variable Interest Entities

The Company reviews agreements it enters into with third-party entities, pursuant to which the Company may have a variable interest in the entity, in order to determine
if the entity is a variable interest entity (“VIE”). If the entity is a VIE, the Company assesses whether or not it is the primary beneficiary of that entity. In determining
whether the Company is the primary beneficiary of an entity, the Company applies a qualitative approach that determines whether it has both (i) the power to direct the
economically  significant  activities  of  the  entity  and  (ii)  the  obligation  to  absorb  losses  of,  or  the  right  to  receive  benefits  from,  the  entity  that  could  potentially  be
significant  to  that  entity.  If  the  Company  determines  it  is  the  primary  beneficiary  of  a  VIE,  it  consolidates  that  VIE  into  the  Company’s  financial  statements.  The
Company’s determination about whether it should consolidate such VIEs is made continuously as changes to existing relationships or future transactions may result in a
consolidation or deconsolidation event.

Property and Equipment, Net

Property and equipment are stated at cost, less accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of the
respective assets, generally three years. Leasehold improvements are amortized on a straight-line basis over the shorter of their estimated useful lives or the term of the
lease.  Depreciation  and  amortization  begins  at  the  time  the  asset  is  placed  in  service.  Maintenance  and  repairs  are  charged  to  expense  as  incurred  and  costs  of
improvement are capitalized.

Leases

Prior to January 1, 2020, the Company accounted for its leases of office space and laboratory facilities under non-cancelable operating lease agreements and recognized
related rent expense on a straight-line basis over the term of the lease. Incentives granted under the Company’s facilities lease, including allowances to fund leasehold
improvements and rent holidays, were recognized as reductions to rental expense on a straight-line basis over the term of the lease. Lessor funded leasehold improvement
incentives not yet received were recorded in prepaid expenses and other current assets on the balance sheets. The Company did not assume renewals in its determination
of the lease term unless they were deemed to be reasonably assured at the inception of the lease and began recognizing rent expense on the date that it obtained the legal
right to use and control the leased space. Deferred rent consisted of the difference between cash payments and the rent expense recognized. The Company recognized a

113

 
 
 
liability for costs that would continue to be incurred under a lease contract for its remaining term without economic benefit at its fair value when the entity ceased using
the right conveyed by the contract, which was when the space was completely vacated. The Company also entered into capital lease agreements for certain equipment
with a lease term of three years. The current portion of capital lease obligations was included in accrued and other current liabilities and the noncurrent capital lease
obligations was included in other noncurrent liabilities on the balance sheets.

Subsequent to January 1, 2020, the Company determines whether the arrangement is or contains a lease at the inception of the arrangement and if so, whether such a
lease  is  classified  as  a  financing  lease  or  an  operating  lease.  Operating  leases  are  included  in  operating  lease  right-of-use  assets,  (“ROU  assets”),  operating  lease
liabilities, net of current portion, and accrued and other current liabilities on the Company’s balance sheets. The Company has elected not to recognize on the balance
sheets leases with terms of one year or less. Operating lease ROU assets represent the Company’s right to use an underlying asset for the lease term and are considered
long-lived  assets  for  purposes  of  identifying,  recognizing  and  measuring  impairment.  Operating  lease  liabilities  represent  the  Company’s  obligation  to  make  lease
payments arising from the lease. Operating lease ROU assets and operating lease liabilities are recognized based on the present value of lease payments over the expected
lease  term.  As  the  Company’s  leases  do  not  provide  an  implicit  rate,  the  Company  uses  its  incremental  borrowing  rate,  which  is  the  rate  incurred  to  borrow  on  a
collateralized basis over a similar term an amount equal to the lease payments in a similar economic environment, in determining the present value of lease payments.
The  operating  lease  ROU  asset  also  includes  any  lease  payments  made  or  incentives  received  and  impairment  charges  if  the  Company  determines  the  ROU  asset  is
impaired and excludes lease incentives. The Company’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company
will exercise such options to extend or terminate the lease. Lease expense for lease payments is recognized on a straight-line basis over the lease term. The Company has
elected  to  not  separate  lease  and  non-lease  components  for  its  leased  assets  and  accounts  for  all  lease  and  non-lease  components  of  its  agreements  as  a  single  lease
component. The lease components resulting in a ROU asset have been recorded on the balance sheets and are amortized as lease expense on a straight-line basis over the
lease term.

The Company does not have any material financing leases.

Impairment of Long-Lived Assets

The  Company  evaluates  long-lived  assets  for  impairment  whenever  events  or  changes  in  circumstances  indicate  that  the  carrying  value  of  an  asset  may  not  be  fully
recoverable. If indicators of impairment exist and the undiscounted future cash flows that the assets are expected to generate are less than the carrying value of the assets,
the Company reduces the carrying amount of the assets through an impairment charge, to their estimated fair value based on a discounted cash flow approach or, when
available and appropriate, to comparable market values. During the year ended December 31, 2020, the Company evaluated indicators of impairment for the ROU asset
and related leasehold improvements considering the current economic environment and COVID-19 outbreak, its impact on subleasing activity and the exit of its previous
headquarters located in Brisbane, California. The Company concluded the carrying value of these assets were not fully recoverable and recorded an impairment charge of
$2.6 million. See Note 7, “Commitments and Contingencies”.

Determining estimated discounted cash flows for purposes of an impairment analysis requires the Company to make estimates and assumptions regarding the amount and
timing of sublease income. There are often risks and uncertainties associated with the intent to sublease offices and laboratory space. Consequently, the eventual realized
sublease  revenues  may  vary  from  estimates  as  of  the  impairment  testing  date  and  adjustments  may  occur  in  future  periods.  Furthermore,  the  Company’s  sublease
assumptions could be further impacted by the COVID-19 outbreak.

Stock-Based Compensation

The  Company  measures  compensation  expense  for  all  stock-based  awards  based  on  their  grant  date  fair  value.  For  stock-based  awards  with  service  conditions  only,
stock-based compensation expense is recognized over the requisite service period using the straight-line method. For awards with performance conditions, the Company
evaluates  the  probability  of  achieving  performance  condition  at  each  reporting  date.  The  Company  begins  to  recognize  stock-based  compensation  expense  using  an
accelerated attribution method when it is deemed probable that the performance condition will be met. Forfeitures are recognized as they occur.

The Company uses the Black-Scholes option-pricing model to estimate the fair value of stock option awards that do not contain market conditions. The Black-Scholes
option-pricing model requires assumptions to be made related to the expected term of an award, expected dividends, expected volatility and risk-free rate. The Company
has used the

114

 
 
 
 
lattice  model  to  estimate  the  fair  value  of  stock  option  awards  that  contain  both  performance  and  market  conditions  and  the  Monte-Carlo  option-pricing  model  to
estimate  the  fair  value  of  stock  option  awards  that  contain  only  market  conditions.  Lattice  models  require  the  use  of  subjective  and  complex  assumptions  which
determine the fair value of such awards including price volatility of the underlying stock and derived service periods. The Monte-Carlo option pricing model uses similar
input assumptions as the Black-Scholes model; however, it further incorporates into the fair-value determination the possibility that the market condition may not be
satisfied.

Restructuring

The Company recognizes restructuring charges related to reorganization plans that have been committed to by management and when liabilities have been incurred. In
connection with these activities, the Company records restructuring charges at fair value for a) contractual employee termination benefits when obligations are associated
to  services  already  rendered,  rights  to  such  benefits  have  vested,  and  payment  of  benefits  is  probable  and  can  be  reasonably  estimated,  and  b)  one-time  employee
termination  benefits  when  management  has  committed  to  a  plan  of  termination,  the  plan  identifies  the  employees  and  their  expected  termination  dates,  the  details  of
termination benefits are complete, it is unlikely changes to the plan will be made or the plan will be withdrawn and communication to such employees has occurred.

One-time employee termination benefits are recognized in their entirety when communication has occurred, and future services are not required. Contract termination
costs to be incurred over the remaining contract term without economic benefit are recorded in their entirety when the contract is canceled.

The recognition of restructuring charges requires the Company to make certain judgments and estimates regarding the nature, timing and amount of costs associated with
the  planned  reorganization  plan.  At  the  end  of  each  reporting  period,  the  Company  evaluates  the  remaining  accrued  restructuring  balances  to  ensure  that  no  excess
accruals are retained, and the utilization of the provisions are for their intended purpose in accordance with developed restructuring plans.

Income Taxes

The Company uses the asset and liability method of accounting for income taxes, in which deferred tax assets and liabilities are recognized for future tax consequences
attributable to the differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases. Deferred tax assets and
liabilities are measured using the enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be reversed. The
effect  on  deferred  tax  assets  and  liabilities  of  a  change  in  tax  rates  is  recognized  as  income  in  the  period  that  includes  the  enactment  date.  A  valuation  allowance  is
established if it is more likely than not that all or a portion of the deferred tax asset will not be realized.

The Company’s tax positions are subject to income tax audits. The Company recognizes the tax benefit of an uncertain tax position only if it is more likely than not that
the  position  is  sustainable  upon  examination  by  the  taxing  authority,  based  on  the  technical  merits.  The  tax  benefit  recognized  is  measured  as  the  largest  amount  of
benefit  which  is  more  likely  than  not  to  be  realized  upon  settlement  with  the  taxing  authority.  The  Company  recognizes  interest  accrued  and  penalties  related  to
unrecognized  tax  benefits  in  its  tax  provision.  The  Company  evaluates  uncertain  tax  positions  on  a  regular  basis.  The  evaluations  are  based  on  a  number  of  factors,
including changes in facts and circumstances, changes in tax law, correspondence with tax authorities during the course of the audit, and effective settlement of audit
issues. The provision for income taxes includes the effects of any accruals that the Company believes are appropriate, as well as the related net interest and penalties.

On  March  18,  2020,  the  Families  First  Coronavirus  Response  Act  (“FFCR  Act”),  and  on  March  27,  2020,  the  Coronavirus  Aid,  Relief,  and  Economic  Security  Act
(“CARES  Act”)  were  each  enacted  in  response  to  the  COVID-19  pandemic.  The  FFCR  Act  and  the  CARES  Act  contain  numerous  tax-related  provisions  relating  to
refundable  payroll  tax  credits,  deferment  of  employer  side  social  security  payments,  net  operating  loss  carryback  periods,  alternative  minimum  tax  credit  refunds,
modifications to the net interest deduction limitations and technical corrections to tax depreciation methods for qualified improvement property.

On June 29, 2020 California State Assembly Bill 85 (the “Trailer Bill”) was enacted which suspends the use of California net operating loss (“NOL”) deductions and
certain tax credits, including research and development tax credits, for the 2020, 2021, and 2022 tax years.

115

 
 
 
 
 
 
 
 
In December 2020, the Consolidated Appropriations Act, 2021 (the “CAA” ) was signed into law. The CAA included additional funding through tax credits as part of its
economic package for 2021.

The  FFCR  Act,  CARES  Act,  Trailer  Bill  and  CAA  did  not  have  a  material  impact  on  the  Company’s  financial  statements  as  of  December  31,  2020;  however,  the
Company continues to examine the impacts the FFCR Act, CARES Act and Trailer Bill may have on its business, results of operations, financial condition and liquidity.

Net Loss per Common Share

Basic net loss per share is calculated by dividing net loss by the weighted average number of shares outstanding for the period. Diluted net loss per share is calculated by
dividing net loss by the weighted average number of shares of common stock and potential dilutive common stock equivalents outstanding during the period if the effect
is dilutive. Since the Company was in a loss position for all periods presented, basic net loss per share is the same as diluted net loss per share as the effects of potentially
dilutive  securities  are  antidilutive.  The  calculation  of  diluted  earnings  (loss)  per  share  also  requires  that,  to  the  extent  the  presumed  issuance  of  additional  shares  as
contingent consideration is dilutive to earnings (loss) per share for the period, adjustments to net income or net loss used in the calculation are required to remove the
change in fair value of the contingent consideration liability for the period. Likewise, adjustments to the denominator are required to reflect the related dilutive shares. In
all  periods  presented,  the  Company’s  outstanding  stock  options,  convertible  preferred  stock,  early  exercised  common  stock  subject  to  future  vesting,  restricted  stock
accounted  for  as  options  common  and  preferred  stock  warrants  and  presumed  issuance  of  additional  shares  as  contingent  consideration  were  excluded  from  the
calculation of diluted net loss per share because their effects were antidilutive.

Comprehensive Loss

Comprehensive loss includes net loss and certain changes in stockholders’ equity (deficit) that are excluded from net loss, primarily unrealized losses on the Company’s
marketable securities.

Recently Adopted Accounting Pronouncements

In  December  2019,  the  Financial  Accounting  Standards  Board  (“FASB”)  issued  Accounting  Standards  Update  (“ASU”)  No.  2019-12,  Income  Taxes  (Topic  740):
Simplifying  the  Accounting  for  Income  Taxes,  which  removes  certain  exceptions  to  the  general  principles  in  Topic  740  related  to  the  approach  for  intraperiod  tax
allocation,  the  methodology  for  calculating  income  taxes  in  an  interim  period  and  the  recognition  of  deferred  tax  liabilities  for  outside  basis  differences.  The  new
guidance also simplifies aspects of the accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a
step-up in the tax basis of goodwill. This ASU is effective for the Company for all interim and annual periods beginning January 1, 2022, with early adoption permitted.
The Company early adopted ASU 2019-12 beginning January 1, 2020 on a prospective basis. The adoption of this standard did not have a material impact on its financial
statements and related disclosures. The only aspect of ASU 2019-12 that is currently applicable to the Company is the removal of the exception related to intraperiod tax
allocation. The Company began applying the general methodology regarding the intraperiod allocation of tax expense in 2020. After the adoption of ASU 2019-12, in
periods where the Company has a loss from continuing operations, the amount of taxes attributable to continuing operations will be determined without regard to the tax
effect of other items, including changes in unrealized gains related to marketable securities.

In November 2018, the FASB issued ASU No. 2018-18, Collaborative Arrangements (Topic 808): Clarifying the Interaction between Topic 808 and Topic 606 (ASU
2018-18), which clarifies that certain transactions between collaborative arrangement participants should be accounted for as revenue under the guidance for contracts
with customers (Topic 606) when the collaborative arrangement participant is a customer in the context of a unit of account. The standard is effective for interim and
annual periods beginning after December 15, 2020, with early adoption permitted, including adoption in any interim period for public business entities for periods in
which financial statements have not been issued. The Company adopted this standard on January 1, 2020. The adoption of this ASU did not have a material impact on the
Company’s financial statements.

In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair
Value Measurement. This ASU eliminates, modifies and adds disclosure requirements for fair value measurements. The amendments in this ASU are effective for fiscal
years,  and  for  interim  periods  within  those  fiscal  years,  beginning  after  December  15,  2019,  with  early  adoption  permitted.  The  Company  adopted  this  standard  on
January 1, 2020. The adoption of this ASU did not have a material impact on its financial statements but did result in enhanced disclosures related to the recurring Level
3 fair value measurements.

116

 
 
 
 
 
 
In June 2018, the FASB issued ASU No. 2018-07, Compensation – Stock Compensation (Topic 718): Improvements to Nonemployee Share-Based Payment Accounting.
The amendments in this ASU expand the scope of Topic 718 to include share-based payment transactions for acquiring goods and services from nonemployees. This new
guidance is effective for the Company in fiscal years beginning after December 15, 2019, and interim periods within fiscal
years beginning after December 15, 2020. Early adoption is permitted. The Company adopted this standard on January 1, 2020. The adoption of this ASU did not have a
material impact on its financial statements.

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842), and related amendments which supersedes the guidance in former ASC 840, Leases. The new
standard, as amended by subsequent ASUs on the Topic, requires lessees to apply a dual approach, classifying leases as either finance or operating leases based on the
principle of whether or not the lease is effectively a financed purchase by the lessee. This classification will determine whether lease expense is recognized based on an
effective interest method or on a straight-line basis over the term of the lease. A lessee is also required to record a right-of-use asset and a lease liability for all leases with
a term of greater than 12 months regardless of their classification. Leases with a term of 12 months or less will be accounted for similar to existing guidance for operating
leases  today.  On  November  15,  2019,  the  FASB  issued  ASU  2019-10  to  delay  the  effective  date  of  this  standard,  making  it  effective  for  the  Company  for  annual
reporting periods beginning after December 15, 2020, and interim periods within annual periods beginning after December 15, 2021, with early adoption permitted.

The  Company  adopted  this  standard  on  January  1,  2020  using  the  modified  retrospective  approach  with  a  cumulative  effect  adjustment  to  accumulated  deficit  at  the
beginning of the period of adoption, if any. The Company elected the package of practical expedients permitted under the transition guidance within Topic 842, which
allowed the Company to carry forward the historical lease classification, retain the initial direct costs for any leases that existed
prior to the adoption of the standard and not reassess whether any contracts entered into prior to the adoption are leases. The Company also elected to account for lease
and  non-lease  components  in  its  lease  agreements  as  a  single  lease  component  in  determining  lease  assets  and  liabilities.  In  addition,  the  Company  elected  not  to
recognize the right-of-use assets and liabilities for leases with lease terms of one year or less. The Company did not elect the
practical expedient allowing the use-of-hindsight, which would require the Company to reassess the lease term of its leases based on all facts and circumstances through
the effective date and did not elect the practical expedient pertaining to land easements as this is not applicable to the current contract portfolio.

Upon adoption of Topic 842, the Company recorded $42.4 million of operating lease liabilities and $27.2 million of right-of-use assets after reclassification of deferred
rent  of  $15.3  million,  as  of  January  1,  2020.  The  adoption  did  not  have  a  material  impact  on  the  Company’s  statements  of  operations  and  comprehensive  loss  or
statements of cash flows. See Note 7, “Commitments and Contingencies” for additional information.

Recently Issued Accounting Pronouncements Not Yet Adopted

In October 2020, the FASB issued ASU 2020-10, Codification Improvements. The ASU contains improvements to the Codification by ensuring that all guidance that
requires or provides an option for an entity to provide information in the notes to financial statements is codified in the disclosure section of the Codification. The ASU
also  improves  various  topics  in  the  Codification  so  that  entities  can  apply  guidance  more  consistently  on  codifications  that  are  varied  in  nature  where  the  original
guidance  may  have  been  unclear.  The  amendments  in  ASU  2020-10  are  effective  for  the  Company  for  fiscal  years  beginning  after  December  15,  2021,  and  interim
periods within fiscal years beginning after December 15, 2022.  Early adoption is permitted.  The Company does not expect the adoption of ASU 2020-10 to have a
material impact on its financial statements and related disclosures.

In August 2020, the FASB issued ASU No. 2020-06 , Debt - Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging - Contracts in
Entity’s  Own  Equity.  ASU  2020-06  eliminates  the  beneficial  conversion  and  cash  conversion  accounting  models  for  convertible  instruments.  It  also  amends  the
accounting for certain contracts in an entity’s own equity that are currently accounted for as derivatives because of specific settlement provisions. In addition, ASU 2020-
06 modifies how particular convertible instruments and certain contracts that may be settled in cash or shares impact the diluted EPS computation. The amendments in
ASU 2020-06 are effective for smaller reporting companies as defined by the SEC for fiscal years beginning after December 15, 2023, including interim periods within
those fiscal years. Early adoption is permitted, but no earlier than fiscal years beginning after December 15, 2020. The Company is currently evaluating the impact of
ASU 2020-06 on its financial statements.

117

 
 
 
 
 
 
 
 
In  August  2018,  the  FASB  issued  ASU  No.  2018-15,  Intangibles  (Topic  350):  Customer’s  Accounting  for    Implementation  Costs  Incurred  in  a  Cloud  Computing
Arrangement That Is a Service Contract, which aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract
with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software. This new standard also requires customers to expense the
capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement. This standard is effective for the Company
for annual reporting periods beginning after December 15, 2020, and interim periods within annual periods beginning after December 15, 2021. This new standard can be
applied either retrospectively or prospectively to all implementation costs incurred after the date of adoption. The Company is currently evaluating the impact of adoption
on its financial statements.

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments-Credit Losses (Topic 326), Measurement of Credit Losses on Financial Instruments, as clarified
in subsequent amendments. ASU 2016-13 changes the impairment model for certain financial instruments. The new model is a forward-looking expected loss model and
will apply to financial assets subject to credit losses and measured at amortized cost and certain off-balance sheet credit exposures. This includes loans, held-to-maturity
debt securities, loan commitments, financial guarantees and net investments in leases, as well as trade receivables. For available-for-sale debt securities with unrealized
losses, credit losses will be measured in a manner similar to today, except that the losses will be recognized as allowances rather than reductions in the amortized cost of
the securities. In October 2019, the FASB voted to delay the effective date of this standard. Topic 326 will be effective for the Company for fiscal years beginning after
December 15, 2022. Early adoption is permitted. The Company is currently assessing the effect that this ASU will have on its financial position, results of operations,
and disclosures.

3. Fair Value Measurements

The Company determines the fair value of financial and non-financial assets and liabilities based on the assumptions that market participants would use in pricing the
asset or liability in an orderly transaction between market participants at the measurement date. The identification of market participant assumptions provides a basis for
determining what inputs are to be used for pricing each asset or liability. A fair value hierarchy has been established which gives precedence to fair value measurements
calculated using observable inputs over those using unobservable inputs. This hierarchy prioritized the inputs into three broad levels as follows:

•

•

•

Level 1: Quoted prices in active markets for identical instruments

Level 2: Other significant observable inputs (including quoted prices in active markets for similar instruments)

Level 3: Significant unobservable inputs (including assumptions in determining the fair value of certain investments)

The carrying amounts of financial instruments such as cash and cash equivalents, restricted cash, prepaid expenses and other current assets, accounts payable, accrued
compensation, accrued and other current liabilities approximate the related fair values due to the short maturities of these instruments. As the long-term debt is subject to
variable interest rates that are based on market rates which are regularly reset, considering level 2 inputs, the Company believes the carrying value of the long-term debt
approximates its fair value.

The fair value of the Company’s cost method investment was measured when it was deemed to be other-than-temporarily impaired until the nature of the underlying
investment changed to be an equity security with a readily determinable fair value which is measured at fair value on a recurring basis.

118

 
 
 
 
 
 
 
The  Company’s  financial  assets  subject  to  fair  value  measurements  on  a  recurring  basis  and  the  level  of  inputs  used  in  such  measurements  were  as  follows  (in
thousands):

Assets:

Cash equivalents:

Money market funds

Total cash equivalents
Short-term marketable securities:

U.S. treasuries
U.S. and foreign commercial paper
U.S. and foreign corporate debt securities
U.S. government debt securities
Total short-term marketable securities
Long-term marketable securities

U.S. treasuries
U.S. government debt securities
Total long-term marketable securities

Total assets subject to fair value measurements
   on a recurring basis

Assets:

Cash equivalents:

Money market funds
U.S. and foreign commercial paper
U.S government debt securities

Total cash equivalents
Short-term marketable securities:

U.S. treasuries
U.S. and foreign commercial paper
U.S. and foreign corporate debt securities
U.S. government debt securities
Total short-term marketable securities
Strategic investments

Foreign equity securities

Total strategic investments
Long-term marketable securities

U.S. treasuries

Total long-term marketable securities

Total assets subject to fair value measurements
   on a recurring basis

Liabilities:

Contingent consideration liability

Total liabilities subject to fair value
   measurements on a recurring basis

Total

Level 1

Level 2

Level 3

December 31, 2020

  $

13,686    $
13,686   

13,686    $
13,686   

—    $
—   

55,349   
11,999   
1,001   
11,543   
79,892 

7,370   
10,501   
17,871   

—   
—   
—   
—   
— 

—   
—   
—   

55,349   
11,999   
1,001   
11,543   
79,892 

7,370   
10,501   
17,871   

  $

111,449    $

13,686    $

97,763    $

Total

Level 1

Level 2

Level 3

December 31, 2019

  $

29,377    $
4,999   
2,550   
36,926   

29,377    $
—   
—   
29,377   

—    $

4,999   
2,550   
7,549   

15,063   
11,972   
8,755   
48,718   
84,508 

5,507 
5,507 

3,025   
3,025   

—   
—   
—   
—   
— 

5,507 
5,507 

—   
—   

15,063   
11,972   
8,755   
48,718   
84,508 

— 
— 

3,025   
3,025   

129,966    $

34,884    $

95,082    $

  $

  $

  $

1,131    $

1,131    $

—    $

—    $

—    $

1,131 

—    $

1,131

— 
— 

— 
— 
— 
— 
— 

— 
— 
— 

—

— 
— 
— 
— 

— 
— 
— 
— 
— 

— 
— 

— 
— 

— 

The Company estimates the fair value of its money market funds, U.S. and foreign commercial paper, U.S. and foreign corporate debt securities, U.S. treasuries, U.S.
government debt securities and foreign equity securities by taking into consideration valuations obtained from third-party pricing services. The pricing services utilize
industry standard valuation models, including both income and market-based approaches, for which all significant inputs are observable, either directly or indirectly, to
estimate  fair  value.  These  inputs  include  reported  trades  of  and  broker/dealer  quotes  on  the  same  or  similar  securities,  issuer  credit  spreads;  benchmark  securities;
prepayment/default projections based on historical data; and other observable inputs. See Note 4, “Marketable Securities,” for further information regarding the carrying
value of the Company's financial instruments.

119

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
    
 
  
 
 
    
 
    
 
    
 
  
 
 
 
 
 
 
 
    
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
    
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
    
 
  
 
 
    
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
  
 
 
  
  
  
  
  
  
  
 
 
  
  
  
 
 
  
  
  
 
 
    
 
    
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
    
 
    
 
    
 
  
 
 
 
The Company held an equity investment in Ascentage International, an affiliate of Ascentage Pharma. The equity interest represented an insignificant level of ownership
in the investee and was recorded within strategic investment on the Company’s balance sheets. See Note 5, “License Agreements and Strategic Investment”. In October
2019,  Ascentage  International  completed  an  initial  public  offering  of  common  stock  on  the  Hong  Kong  Stock  Exchange.  Following  the  initial  public  offering,  the
Company’s underlying investment changed to be an equity security with a readily determinable fair value which was measured at fair value on a recurring basis based on
quoted stock prices available on the Hong Kong Stock Exchange, which are considered observable inputs (Level 1). During the year ended  December 31, 2020, the
Company sold its entire equity investment in Ascentage International. The fair value of the Company’s equity investment in Ascentage International was zero and $5.5
million as of December 31, 2020 and 2019, respectively, and was included in strategic investment on the Company’s balance sheets. The change in fair value of this
investment was $0.5 million and $4.5 million for the years ended December 31, 2020 and 2019, respectively, and was recorded in other income (expense), net on the
statements of operations and comprehensive loss.

The Company had previously recorded a contingent consideration liability related to three agreements (the “Commercial Agreements”) with Ascentage Pharma Group
Corp.  Limited,  a  clinical-stage  biopharmaceutical  company  based  in  Hong  Kong  China  (“Ascentage  Pharma”).  See  Note  5,  “License  Agreements  and  Strategic
Investment”. The fair value of the contingent consideration liability at December 31, 2019 included inputs not observable in the market and thus represented a Level 3
measurement.  The  probability  of  achieving  the  defined  milestone  events  under  the  Commercial  Agreements  was  estimated  on  a  quarterly  basis  by  the  Company’s
management using a probability-weighted valuation approach model which utilized current stock price and reflected the probability and timing of future issuances of
shares. As a result of settlements and changes made to the Commercial Agreements, there was no contingent consideration liability at December 31, 2020.

The following table provides a reconciliation of liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) (in thousands):

Balance at December 31, 2018
Additions
Settlements
Change in fair value
Balance at December 31, 2019
Additions
Settlements
Change in fair value
Balance at December 31, 2020

120

Amount

2,483 
— 
— 
(1,352)
1,131 
— 
(1,098)
(33)
—

  $

  $

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
4. Marketable Securities

Marketable securities, which are classified as available-for-sale, consisted of the following (in thousands):

Amortized
Cost Basis

Unrealized
Gains

Unrealized
Losses

Fair
Value

December 31, 2020

Cash equivalents:

Money market funds

Total cash equivalents
Short-term marketable securities:

U.S. and foreign commercial paper
U.S. and foreign corporate debt securities
U.S. government debt securities
U.S. treasuries

Total short-term marketable securities
Long-term marketable securities

U.S. treasuries
U.S. government debt securities
Total long-term marketable securities
Total marketable securities

Cash equivalents:

Money market funds
U.S. and foreign commercial paper
U.S. government debt securities

Total cash equivalents
Short-term marketable securities:

U.S. and foreign commercial paper
U.S. and foreign corporate debt securities
U.S. government debt securities
U.S. treasuries

Total short-term marketable securities
Long-term marketable securities

U.S. treasuries

Total long-term marketable securities
Total marketable securities

Amortized
Cost Basis

Unrealized
Gains

Unrealized
Losses

Fair
Value

December 31, 2019

  $

13,686    $
13,686   

  $

  $

11,998   
1,001   
11,541   
55,350   
79,890   

7,369 
10,498 
17,867 
111,443    $

29,377    $
4,999   
2,550   
36,926   

11,965   
8,748   
48,647   
15,057   
84,417   

3,025 
3,025 
124,368    $

  $

—    $
—   

1   
—   
2   
2   
5   

1 
3 
4 
9    $

—    $
—   

—   
—   
—   
(3)  
(3)  

—   
—   
— 
(3)   $

13,686 
13,686 

11,999 
1,001 
11,543 
55,349 
79,892 

7,370 
10,501 
17,871 
111,449

—    $
—   
—   
—   

7   
8   
71   
6   
92   

— 
— 
92    $

—    $
—   
—   
—   

—   
(1)  
—   
—   
(1)  

29,377 
4,999 
2,550 
36,926 

11,972 
8,755 
48,718 
15,063 
84,508 

—   
— 
(1)   $

3,025 
3,025 
124,459

At December 31, 2020, the remaining contractual maturities of available-for-sale debt securities were less than one year. There have been no significant realized gains or
losses on available-for-sale debt securities for the periods presented. Available-for-sale debt securities that were in a continuous loss position but were not deemed to be
other than temporarily impaired were immaterial at both December 31, 2020 and 2019. The Company does not intend to and believes it is not more likely than not that it
will be required to sell these debt securities before their maturities.

See Note 3, “Fair Value Measurements,” for further information regarding the fair value of the Company's financial instruments.

5. License Agreements and Strategic Investment

License and Compound Library and Option Agreement

The Company is a party to three agreements with Ascentage Pharma: (a) a compound library and option agreement executed in February 2016 granting the Company the
right  to  identify  and  take  licenses  to  research,  develop,  and  seek  and  obtain  marketing  approval  for  library  compounds  for  the  treatment  of  indications  outside  of
oncology (the “Library Agreement”), (b) an initial license agreement executed in February 2016 granting the Company rights to an

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initial Ascentage Pharma compound known as APG1252 (the “APG1252 License Agreement”), and (c) a second license agreement executed in January 2019 granting
the  Company  rights  to  a  second  licensed  compound  (this  second  license  agreement,  the  “Bcl  License  Agreement”  and  collectively  with  the  Library  Agreement  and
APG1252 License Agreement, the “Commercial Agreements”). On July 30, 2020, the Company notified Ascentage Pharma of its termination of the APG1252 License
Agreement due to the Company’s decision to prioritize the progression of other compounds from Ascentage International’s library of Bcl-2 inhibitors, such as UBX1325
and UBX1967.

The Commercial Agreements referenced above include cash payments of up to $70.3 million as well as the equity payments of up to an aggregate of (a) 933,337 shares
of common stock in the event there is only one licensed product, and (b) 1,333,338 shares of common stock in the event there are two or more licensed products, in each
case to be issued based on the Company’s achievement of certain preclinical and clinical development and sales milestone events. The Company is required to make 80%
of all equity payments to Ascentage Pharma and the remaining 20% to an academic institution from whom Ascentage Pharma had previously licensed the technology.
The  milestones  include  the  advancement  of  additional  compounds  into  Investigational  New  Drug  application    (“IND”)  enabling  studies,  the  filing  of  an  IND,  the
commencement of clinical studies, Food and Drug Administration (“FDA”) and/or European Medicines Agency approval, and a net sales threshold. The Bcl License
Agreement also includes tiered royalties in the low-single digits based on sales of licensed products.

In  December  2018,  the  Company  elected  to  advance  a  second  compound  into  formal  preclinical  development,  which  gave  rise  to  an  obligation  under  the  compound
library and option agreement to issue 133,334 shares of common stock to Ascentage Pharma and the academic institution. These shares were issued to Ascentage Pharma
in January 2019 and the academic institution in March 2019.

In June 2020, the Company entered into a third amendment to the Bcl License Agreement. Under the terms of the original Bcl License Agreement, Ascentage Pharma
granted the Company exclusive development and commercialization rights and non-exclusive manufacturing rights to an Ascentage Bcl inhibitor compound known as
UBX1967 as well as the right to continue its preclinical development efforts with another Ascentage-controlled Bcl inhibitor compound, known as UBX1325, a small
molecule inhibitor of the anti-apoptotic Bcl-2 family member, Bcl-xL, that served as a back-up compound to UBX1967. Under the terms of the third amendment to the
Bcl License Agreement, the status of UBX1967 and UBX1325 were switched such that UBX1325 became the licensed compound and UBX1967 became the back-up
compound under the Bcl License Agreement.

In July 2020, the Company filed an IND for the Phase 1 clinical study for UBX1325, which gave rise to an obligation under the Bcl License Agreement to issue an
additional  133,334  shares  of  common  stock  to  Ascentage  Pharma  and  the  academic  institution.  These  shares  were  issued  to  Ascentage  Pharma  and  the  academic
institution in August 2020. In October 2020, the Company initiated a Phase 1 safety and tolerability study of UBX1325 in patients with diabetic macular edema and age-
related macular degeneration. As a result of the first patient dosed in the UBX1325 study, the Company triggered a milestone payment of $1.0 million to Ascentage
Pharma, which the Company elected to settle in shares of the Company’s common stock. The Company issued 228,310 shares of its common stock to Ascentage Pharma
in November 2020 with a fair market value of $1.2 million at settlement date. The payment was recognized as research and development expense in the statement of
operations and comprehensive loss during the year ended December 31, 2020.

As  of  December  31,  2020,  the  Company  had  issued  974,980  shares  of  common  stock  to  Ascentage  Pharma  and  186,667  shares  of  common  stock  to  the  academic
institution from whom Ascentage Pharma had previously licensed the technology.

The Commercial Agreements included contingent consideration in the form of additional issuances of shares of the Company’s common stock based on the achievement
of the specified milestones. Upon the July 2020 termination of the license to APG1252, the Company determined that the contingency no longer applied and adjusted the
fair value of the contingent consideration liability to zero.  The Company had recorded a contingent consideration liability of $1.1 million at December 31, 2019 based on
the estimates for milestone achievements at the time. To date, no royalties were due from the sales of licensed products.

Strategic Investment

In April 2016, in connection with the Commercial Agreements, the Company purchased an interest in an affiliate of Ascentage Pharma for an aggregate purchase price of
$0.5  million.  In  May  2018,  this  interest  was  exchanged  for  an  interest  in  a  newly  formed  affiliate  of  Ascentage  Pharma  called  Ascentage  International  as  part  of  a
reorganization of those entities. The Company also invested an additional $0.5 million in Ascentage International in May 2018

122

 
 
 
 
 
 
 
 
 
which was recorded within other long-term assets on the Company’s balance sheet as of December 31, 2018.

In  October  2019,  Ascentage  International  completed  an  initial  public  offering  of  shares  of  its  common  stock  on  the  Hong  Kong  Stock  Exchange  at  HK$34.20
(approximately USD $4.36) per share. In connection with Ascentage International’s initial public offering, the Company’s interest converted into shares of common stock
of Ascentage International. The Company determined that its investment in Ascentage International met the definition of an equity security with a readily determinable
fair value which was measured at fair value on a recurring basis based on quoted stock price available on the Hong Kong Stock Exchange. The Company was subject to a
lock-up agreement with Ascentage International that precluded the Company from selling shares prior to April 28, 2020. During the year ended December 31, 2020, the
Company sold its entire holdings in Ascentage International for cash proceeds of $6.0 million and recorded a corresponding loss of $2.2 million. The Company’s total
original investment in Ascentage was $1.0 million. The fair value of the Company’s investment in Ascentage International as of December 31, 2019 was $5.5 million,
which was included in strategic investment.

The Company agreed to provide funding to Ascentage Pharma for research and development work performed at a cost of up to $2.0 million through February 2020. The
research and development expense under the research services agreement was not material.

Other License Agreements with Research Institutions

In May 2019, the Company entered into a license agreement with The Regents of the University of California on behalf its San Francisco campus (collectively, “UCSF”)
which provides the Company the rights to certain patents and related know-how to make, use, sell, offer for sale and import certain products and practice certain methods
for use in the development of human therapeutics, which excludes the provision of services to third parties for consideration of any kind. The license to the Company is
subject  to  UCSF’s  reserved  rights  under  the  licensed  intellectual  property  for  educational  and  non-commercial  research  purposes  and  a  requirement  to  substantially
manufacture  any  licensed  products  in  the  United  States.  The  Company  is  obligated  to  use  diligent  efforts  to  develop  and  obtain  regulatory  approval  for  at  least  one
product commercialized pursuant to the agreement, and must meet certain regulatory and development milestones. In June 2019, as part of this license agreement, the
Company issued 120,000 shares of its common stock to UCSF. In addition, the Company is obligated to pay an annual license maintenance fee and may be obligated to
make milestone payments or issue up to an additional 34,000 shares of its common stock upon the occurrence of specified development events, up to aggregate milestone
payments of $13.6 million for each product licensed under the agreement, and upon commercialization, to make royalty payments in the low single digit percentages
(subject to a specified minimum annual royalty) based on net sales of products commercialized pursuant to the agreement. None of these events had occurred and no
milestone payments or royalty payments had been recognized as of December 31, 2020. The upfront issuance of 120,000 shares of the Company’s common stock was
valued at $1.0 million and recorded as additional paid-in capital upon issuance in June 2019.

The Company has also entered into license agreements with various research institutions which have provided the Company with rights to patents, and in certain cases,
research “know-how” and proprietary research tools to research, develop and commercialize drug candidates. In addition to upfront consideration paid to these various
research institutions in either cash or shares of the Company’s common stock, the Company may be obligated to make milestone payments, payable in cash and/or the
issuance  of  shares  of  the  Company’s  common  stock  upon  achievement  of  certain  specified  clinical  development  and/or  sales  events.  The  contingent  consideration
liability considered to be a derivative associated with the potential issuance of common stock related to these license agreements was not significant at December 31,
2020 or 2019. To date, none of these events has occurred and no contingent consideration, milestone or royalty payments have been recognized.

123

 
 
 
6. Balance Sheet Components

Property and Equipment, Net

Property and equipment, net, consists of the following (in thousands):

Laboratory equipment
Computer equipment
Furniture and fixtures
Leasehold improvements
Total property and equipment
Less: accumulated depreciation and amortization
Total property and equipment, net

December 31,

2020

2019

5,960    $
501   
825   
15,083   
22,369   
(9,742)  
12,627    $

5,219 
472 
825 
16,436 
22,952 
(6,316)
16,636

  $

  $

Depreciation and amortization expense related to property and equipment was $3.4 million, $2.7 million and $2.2 million for the years ended December 31, 2020, 2019
and 2018, respectively.

Accrued and Other Current Liabilities

Accrued and other current liabilities consist of the following (in thousands):

Operating lease liability - current portion
Accrued research and development
Deferred rent, current portion
Liability related to early exercise shares
Accrued other

7. Commitments and Contingencies

Leases

December 31,

2020

2019

4,520    $
1,638 
—   
21   
371   
6,550    $

— 
2,214 
1,849 
237 
695 
4,995

  $

  $

In February 2019, the Company entered into a lease agreement for new office and laboratory space in South San Francisco, California. The term of the lease agreement
commenced in May 2019.  The lease has an initial term of ten years from the commencement date, and the Company has an option to extend the initial term for an
additional eight years at the then market rental rates.  The total base rent payment escalates annually based on a fixed percentage beginning from the 13th month of the
lease agreement.  The Company will also be responsible for the operating expenses and real estate taxes allocated to the building and common areas. Pursuant to the
lease  agreement,  the  landlord  provided  the  Company  with  a  tenant  improvement  allowance  of  $10.7  million,  which  was  included  in  deferred  rent  and  leasehold
improvements  on  the  balance  sheet  at  December  31,  2019.  In  connection  with  the  execution  of  the  lease  agreement,  the  Company  delivered  a  letter  of  credit  of
approximately $0.9 million to the landlord.

In  May  2016,  the  Company  executed  a  non-cancellable  lease  agreement  for  office  and  laboratory  space  in  Brisbane,  California  which  commenced  in  May  2016  and
continues through October 2022. The lease agreement includes an escalation clause for increased rent and a renewal provision allowing the Company to extend this lease
for an additional four years by giving the landlord written notice of the election to exercise the option at least fifteen months prior to the original expiration of the lease
term. The lease provides for monthly base rent amounts escalating over the term of the lease and the lessor provided the Company a $3.9 million tenant improvement
allowance to complete the laboratory and office renovation which was recorded as deferred rent liability and leasehold improvements within property and equipment, net.
In May 2017, the Company entered into an amendment to expand the leased space and received a three-month rent holiday for the expanded space.

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The  Company’s  operating  leases  include  various  covenants,  indemnities,  defaults,  termination  rights,  security  deposits  and  other  provisions  customary  for  lease
transactions of this nature.

The  following  table  summarizes  the  components  of  lease  expense,  which  are  included  in  operating  expenses  in  the  Company’s  statements  of  operations  and
comprehensive loss (in thousands):

Operating lease cost
Variable lease cost
Impairment of operating lease right-of-use asset

Total lease cost

Year ended
December 31, 2020

4,721 
1,168 
1,409 
7,298

  $

  $

Variable lease payments include amounts relating to common area maintenance, real estate taxes and insurance and are recognized in the statements of operations and
comprehensive loss as incurred. Rent expense for the years ended December 31, 2019 and 2018 was $4.5 million and $1.8 million, respectively.

The following table summarizes supplemental information related to leases (in thousands):

Cash paid for amounts included in the measurement of lease liabilities

Operating cash flows from operating leases
Weighted-average remaining lease term (years)

Operating leases

Weighted-average discount rate (percentage)

Operating leases

The following table summarizes the maturities of lease liabilities as of December 31, 2020 (in thousands):

2021
2022
2023
2024
2025
Thereafter

Total future minimum lease payments

Less: Amount representing interest

Present value of future minimum lease payments

Less: Current portion of operating lease liability
Noncurrent portion of operating lease liability

Year Ended
December 31, 2020

  $

5,797 

8.5 

5.8%

Amount

6,653 
6,283 
4,810 
4,964 
5,123 
22,179 
50,012 
(11,024)
38,988 
(4,520)
34,468

  $

The cumulative effect on the Company’s balance sheets at January 1, 2020 from the adoption of Topic 842 was as follows (in thousands):

Operating lease right-of-use assets
Accrued and other current liabilities
Operating lease liabilities, current portion
Deferred rent, net of current portion
Operating lease liabilities, net of current portion

December 31,
2019

Topic 842
Adjustments

January 1,
2020

  $

—    $

4,995 
— 
13,298 
— 

27,174    $
(1,970)   
3,455 
(13,298)   
38,988 

27,174 
3,025 
3,455 
— 
38,988

In February 2020, the Company completed its move into the new office and laboratory space in South San Francisco, exited its previous offices and laboratory space in
Brisbane, California, and began to actively market this

125

 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
   
  
   
  
   
   
  
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
  
   
  
  
   
  
   
  
  
 
space for sublease. Concurrent with this move and in consideration of real estate market conditions, in particular due to the COVID-19 pandemic in March 2020, the
Company identified indicators of impairment in the related asset group, which included the leased ROU asset and related leasehold improvements associated with the
lease. The Company subsequently evaluated and compared the net book value of the asset group to the estimated undiscounted future cash flows over the remaining term
of the lease and concluded that an impairment had occurred. The discounted estimated future cash flows included estimates of sublease rentals through the end of the
lease term, which ends on October 31, 2022, utilizing a discount rate of 3.5% based on the Company’s estimated incremental borrowing rate at that time. The estimated
discounted cash flows were compared to the net book value of the ROU asset and leasehold improvements resulting in an impairment loss of $2.2 million. The loss was
recorded  at  the  end  of  the  first  quarter  of  2020  in  operating  expense  in  the  statements  of  operations  and  comprehensive  loss..  During  the  remainder  of  the  year,  the
Company  continued  to  review  the  assets  for  indicators  of  impairment.    During  year  end,  the  Company  updated  its  estimates  of  sublease  rental  income,  based  on  the
sublease that was executed for this space in February 2021 and market factors on leasing activity caused by the COVID-19 pandemic, in the discounted estimated future
cash flows, and utilizing a discount rate of 2.935%, determined when compared to the net book value of the ROU asset and leasehold improvements, there was further
impairment of the assets. The Company recorded an additional impairment charge of $0.4 million, resulting in a total impairment loss of $2.6 million for the year ended
December 31, 2020. The impairment loss was allocated proportionally to the right-of-use asset of $1.4 million and leasehold improvements of $1.2 million and recorded
in  operating  expense  in  the  statements  of  operations  and  comprehensive  loss  for  the  year  ended  December  31,  2020.  After  recording  the  impairment,  the  remaining
balance of the ROU asset and leasehold improvements was $1.0 million and $0.8 million, respectively.

Indemnifications

The Company indemnifies each of its officers and directors for certain events or occurrences, subject to certain limits, while the officer or director is or was serving at the
Company’s  request  in  such  capacity,  as  permitted  under  Delaware  law  and  in  accordance  with  the  Company’s  amended  and  restated  certificate  of  incorporation  and
bylaws. The term of the indemnification period lasts as long as an officer or director may be subject to any proceeding arising out of acts or omissions of such officer or
director in such capacity.

The maximum amount of potential future indemnification is unlimited; however, the Company currently holds director and officer liability insurance. This insurance
allows the transfer of risk associated with the Company’s exposure and may enable the Company to recover a portion of any future amounts paid. The Company believes
that the fair value of these potential indemnification obligations is minimal. Accordingly, the Company has not recognized any liabilities relating to these obligations for
any period presented.

8. Term Loan Facility

On  August  3,  2020,  the  Company  entered  into  a  Loan  and  Security  Agreement  (the  “Loan  Agreement”)  with  Hercules  Capital,  Inc.  (“Hercules”).  Under  the  Loan
Agreement, Hercules provided the Company with access to a term loan with an aggregate principal amount of up to $80.0 million (the “Term Loan Facility”), available
in four tranches, subject to certain terms and conditions. The first tranche of $25.0 million was advanced to the Company on the date the Loan Agreement was executed.
The milestones for the remaining tranches have not yet been reached and as of December 31, 2020 will not be reached as they were dependent, in whole or in part, upon
continued  advancement  in  the  clinical  development  of  UBX0101  in  patients  with  osteoarthritis  of  the  knee.  The  Company  expects  to  make  interest  only  payments
through September 1, 2022, or extended to March 1, 2023 upon satisfaction of certain milestones, and expects to then repay the principal balance and interest in equal
monthly installments through August 1, 2024.

The Company may prepay advances under the Loan Agreement, in whole or in part, at any time subject to a prepayment charge of up to 1.50% of any amount prepaid,
depending upon when the prepayment occurs. Upon prepayment or repayment of all or any of the term loans under the Term Loan Facility, the Company is required to
pay  an  end  of  term  fee  (“End  of  Term  Fee”)  equal  to  6.25%  of  the  total  aggregate  amount  of  the  term  loans  being  prepaid  or  repaid,  which  has  been  recorded  as  a
discount on the principal balance upon issuance.

Interest on the term loan accrues at a per annum rate equal to the greater of (i) the Wall Street Journal prime rate plus 6.10% and (ii) 9.35%. On December 31, 2020, the
rate  was  9.35%.  Interest  expense  is  calculated  using  the  effective  interest  method  and  is  inclusive  of  non-cash  amortization  of  capitalized  loan  issuance  costs.  At
December 31, 2020, the effective interest rate was 12.40%.

126

 
 
 
 
 
Under  the  terms  of  the  Loan  Agreement,  the  Company  granted  first  priority  liens  and  security  interests  in  substantially  all  of  the  Company’s  intellectual  property  as
collateral for the obligations thereunder. The Company also granted Hercules the right, at their discretion, to participate in any closing of any single subsequent financing
up to a maximum aggregate amount of $2.0 million. The Loan Agreement also contains representations and warranties by the Company and Hercules, indemnification
provisions  in  favor  of  Hercules  and  customary  affirmative  and  negative  covenants  (including  a  liquidity  covenant  beginning  July  1,  2021,  requiring  the  Company  to
maintain at least a $15.0 million cash reserve), and events of default, including a material adverse change in the Company’s business, payment defaults, breaches of
covenants following any applicable cure period, and a material impairment in the perfection or priority of Hercules’ security interest in the collateral. In the event of
default by the Company under the Loan Agreement, the Company may be required to repay all amounts then outstanding under the Loan Agreement. As of December
31, 2020, the Company was in compliance with all covenants under the Loan Agreement.

As of December 31, 2020, the carrying value of the term loan consists of $25.0 million principal outstanding less the debt discount and issuance costs of approximately
$2.1 million. The End of Term Fee of $1.6 million is treated as deferred financing costs, recognized over the life of the term loan and accreted to interest expense using
the effective interest method. The debt issuance costs have been recorded as a debt discount which are being amortized to interest expense through the maturity date of
the term loan.

Interest expense relating to the term loan, which is included in interest expense in the statements of operations and comprehensive loss, was $1.3 million for the year
ended December 31, 2020.

Future principal payments for the long-term debt are as follows (in thousands):

2021
2022
2023
2024

Total principal payments

End of term fee due at maturity in 2024

Total principal and end of term fee payments

Unamortized discount and debt issuance costs
Long-term debt, net

December 31, 2020

— 
3,838 
12,272 
8,890 
25,000 
1,562 
26,562 
(2,054)
24,508

  $

  $

9. Related Party Transactions

Recourse Notes

In October 2017, the Company issued two promissory notes to an executive officer for $1.6 million and $0.5 million, each with an interest rate of 1.85% per annum. The
aggregate  principal  amount  of  $2.1  million  was  used  to  purchase  625,084  shares  of  restricted  stock.  The  promissory  notes  were  considered  to  be  non-recourse  in
substance and accordingly, the shares sold subject to such promissory notes are considered to be an option for accounting purposes. In April 2018, the Company’s board
of directors approved the forgiveness of all outstanding principal and accrued interest of the $1.6 million non-recourse promissory note. The non-recourse promissory
note outstanding of $0.5 million was repaid on April 4, 2018 in accordance with the terms of the note. The forgiveness of the promissory note was accounted for as a
modification of a share-based payment. The Company recorded an incremental charge of $1.5 million related to the modification for the year ended December 31, 2018.

In January 2018, the Company issued full-recourse promissory notes to an executive and an executive officer of the Company for an aggregate principal amount of $0.4
million with an interest rate of 2.5% per annum. All of the principal was used to early exercise options for 114,406 shares of the Company’s common stock. The full
recourse note of $0.2 million for the executive officer was repaid on April 4, 2018 in accordance with the terms of the note.  In December 2019, the full recourse note to
an  executive  was  deemed  satisfied  and  superseded  by  a  new  full  recourse  promissory  note  agreement  with  a  principal  amount  of  $0.2  million  and  an  interest  rate  of
1.51% per annum. At December 31, 2020, $0.2 million was recorded on the balance sheet in stockholders’ equity related to the executive’s full recourse promissory note
agreement.

127

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
10. Common and Preferred Stock

The  Company  has  10,000,000  shares  of  convertible  preferred  stock  authorized  for  issuance,  par  value  of  $0.0001  per  share.  As  of  December  31,  2020  and  2019,  no
shares of preferred stock were issued and outstanding. In connection with the Company’s IPO, all outstanding shares of convertible preferred stock were automatically
converted into 32,073,149 shares of common stock.

The Company has 300,000,000 shares of common stock authorized for issuance, par value of $0.0001 per share. Holders of the Company’s common stock are entitled
to one vote per share. As of December 31, 2020 and 2019, there were 53,253,213 and 47,227,065 shares of common stock issued and outstanding.

Preferred Stock Offering

In  March  2018,  the  Company  amended  and  restated  its  certificate  of  incorporation  to,  among  other  things,  (i)  increase  its  authorized  shares  of  common  stock  from
122,000,000  to  140,000,000  shares,  (ii)  increase  its  authorized  shares  of  preferred  stock  from  91,739,149  to  103,283,818  shares,  of  which  11,544,669  shares  were
designated as Series C convertible preferred stock, and (iii) set forth the rights, preferences and privileges of the Series C convertible preferred stock. In March 2018, the
Company sold 3,590,573 shares of Series C convertible preferred stock at $15.3317 per share for net proceeds of $54.9 million and in April 2018, the Company sold an
additional 322,852 shares of Series C convertible preferred stock $15.3317 per share for net proceeds of $5.0 million.

Initial Public Offering

On May 7, 2018, the Company closed its initial public offering (“IPO”), of 5,000,000 shares of common stock, at an offering price to the public of $17.00 per share. The
Company  received  net  proceeds  of  approximately  $75.9  million,  after  deducting  underwriting  discounts,  commissions  and  offering  related  transaction  costs  of
approximately  $9.1  million.  In  connection  with  the  IPO,  all  of  the  Company’s  outstanding  shares  of  convertible  preferred  stock  were  automatically  converted  into
32,073,149 shares of common stock. In addition, all of the Company’s convertible preferred stock warrants were converted into warrants to purchase shares of common
stock.

In  connection  with  the  completion  of  its  IPO,  on  May  7,  2018,  the  Company’s  certificate  of  incorporation  was  amended  and  restated  to  provide  for  300,000,000
authorized shares of common stock with a par value of $0.0001 per share and 10,000,000 authorized shares of preferred stock with a par value of $0.0001 per share.

At-the-Market Offerings

In June 2019, the Company filed a Registration Statement on Form S-3 (the “Shelf Registration Statement”), covering the offering of up to $250.0 million of common
stock, preferred stock, debt securities, warrants and units. The Shelf Registration Statement included a prospectus covering the offering, issuance and sale of up to $75.0
million  of  the  Company’s  common  stock  from  time  to  time  through  an  “at-the-market”  offering  under  the  Securities  Act  of  1933,  as  amended  (the  “ATM  Offering
Program”). The SEC declared the Shelf Registration Statement effective on June 6, 2019.

In June 2019, the Company also entered into a sales agreement (the “June 2019 Sales Agreement”) with Cowen and Company, LLC (“Cowen”) to sell shares of the
Company’s common stock, from time to time, with aggregate gross sales proceeds of up to $75.0 million, through the ATM Offering Program under which Cowen acts as
its sales agent. Cowen is entitled to compensation for its services equal to up to 3.0% of the gross proceeds of any shares of common stock sold through Cowen under the
June 2019 Sales Agreement. During the year ended December 31, 2020, the Company issued and sold 5,002,257 shares of its common stock through its ATM Offering
Program and received net proceeds of approximately $37.3 million, after deducting commissions  and other offering expenses of $1.3 million.

In July 2020, the Company filed an additional prospectus supplement to the Shelf Registration Statement. This prospectus supplement covers the offering, issuance and
sale of up to an additional $50.0 million of the Company’s common stock from time to time through an additional “at-the-market” offering under the Securities Act of
1933, as amended (the “Additional ATM Offering Program”).

In July 2020, the Company entered into a second sales agreement (the “July 2020 Sales Agreement”) with Cowen to sell shares of the Company’s common stock, from
time to time, with aggregate gross sales proceeds of up to $50.0 million, through the Additional ATM Offering Program under which Cowen will act as its sales agent.
The issuance

128

 
and sale of shares of common stock by the Company pursuant to the July 2020 Sales Agreement are also deemed an “at-the-market” offering under the Securities Act of
1933, as amended (the “Securities Act”). Cowen is entitled to compensation for its services equal to up to 3.0% of the gross proceeds of any shares of common stock sold
through Cowen under the July 2020 Sales Agreement. During the third and fourth quarters of 2020, there were no shares of the Company’s common stock sold through
the Additional ATM Offering Program.

11. Corporate Restructuring

In September 2020, the Company’s board of directors implemented a corporate restructuring to align its resources on cellular senescence programs in ophthalmology and
neurology while further extending operating capital. The restructuring resulted in an elimination of approximately 33 positions, or approximately 32% of the Company’s
workforce, as of September 30, 2020. The Company incurred a one-time employee benefits and severance charge of approximately $1.8 million in operating expenses
during the year ended December 31, 2020. The related accrual is recorded in accrued compensation on the balance sheet at December 31, 2020. Restructuring charges
incurred under this plan primarily consisted of employee termination benefits. Employee termination benefits include severance costs, employee-related benefits, and
supplemental  one-time  termination  payments.  Charges  and  other  costs  related  to  the  workforce  reduction  and  structure  realignment,  and  non-cash  share-based
compensation credits related to the forfeiture of stock options are included in operating expenses in the statements of operations and comprehensive loss. Of the total
charge, $1.5 million was recorded to research and development expenses and $0.3 million was recorded to general and administrative expenses during the year ended
December 31,  2020. Substantially all cash payments are expected to be paid out by the first quarter of 2021. The Company may also incur additional costs not currently
contemplated due to events that may occur as a result of, or that are associated with, the restructuring.

12. Stock-Based Compensation

Summary of Equity Incentive Plans

In March 2018, the Company’s board of directors adopted the Company’s 2018 Incentive Award Plan (the “2018 Plan”). The 2018 Plan was approved by the Company’s
stockholders  in  April  2018  and  became  effective  in  May  2018.    The  2018  Plan  initially  reserved  4,289,936  shares  for  the  issuance  of  stock  options  as  well  as  any
automatic annual increases in the number of shares of common stock reserved for future issuance under the 2018 Plan.  Awards granted under the 2018 Plan expire no
later than ten years from the date of grant. For stock options, the option price shall not be less than 100% of the estimated fair value on the day of grant. Options granted
typically  vest  over  a  four-year  period  but  may  be  granted  with  different  vesting  terms.  Unvested  options  not  exercised  at  the  time  of  an  employee’s  termination  of
employment are added back to the 2018 Plan.

Following the Company’s IPO and in connection with the effectiveness of the 2018 Plan, the 2013 Equity Incentive Plan (the “2013 Plan”) terminated and no further
awards will be granted under that plan. All outstanding awards under the 2013 Plan will continue to be governed by their existing terms and the shares that remained
outstanding for issuance under the 2013 Plan were transferred into the 2018 Plan. As of December 31, 2020, there was an aggregate 12,001,501 shares of common stock
authorized for issuance under the 2018 Plan.

Prior  to  its  termination,  the  2013  Plan  provided  for  the  granting  of  incentive  stock  options  (“ISOs”),  non-statutory  stock  options  (“NSOs”)  and  restricted  shares  to
employees, directors, and consultants at the discretion of management and the board of directors. The exercise price of an ISO and NSO shall not be less than 100% of
the estimated fair value of the shares on the date of grant, and the exercise price of an ISO and NSO granted to a 10% stockholder shall not be less than 110% of the
estimated fair value of the shares on the date of grant. For awards granted between September 2017 and February 2018 with an exercise price of $3.42, a deemed fair
value ranging from $3.95 to $8.47 per share was used in calculating stock-based compensation expense, which was determined using management hindsight. Options
granted under the 2013 Plan expire no later than 10 years from the date of grant and generally vest over a four-year period but may be granted with different vesting
terms. Unvested options not exercised at the time of an employee’s termination of employment are added back to the 2018 Plan.

Under the 2013 Plan, the Company permitted early exercise of certain stock options prior to vesting. These unvested shares are subject to repurchase by the Company at
the original issuance price in the event the optionee’s employment is terminated either voluntarily or involuntarily. The amounts paid for shares purchased under an early
exercise of stock options and subject to repurchase by the Company are reported as a liability and reclassified into additional paid-in capital as the shares vest.

129

 
In March 2020, the Company’s board of directors approved the Company’s 2020 Employment Inducement Incentive Plan (“the 2020 Plan”), to provide for grants to
newly  hired  employees  as  a  material  inducement  for  them  to  commence  employment  with  the  Company.    The  2020  Plan  initially  reserved  1,100,000  shares  for  the
issuance  of  stock  options,  and  in  November  2020,  the  Company  reserved  an  additional  1,500,000  shares  of  common  stock  for  future  issuance  under  the  2020  Plan.
Awards granted under the 2020 Plan expire no later than ten years from the date of grant. For stock options, the option price shall not be less than 100% of the estimated
fair value on the day of grant. Options granted typically vest over a four-year period but may be granted with different vesting terms. Unvested options not exercised at
the time of an employee’s termination of employment are added back to the 2020 Plan.  As of December 31, 2020, there was an aggregate 2,570,000 shares of common
stock authorized for issuance under the 2020 Plan.

Equity Incentive Plan Activity

The following sections summarize activity under the Company’s equity incentive plans.

Stock Options, Restricted Stock Units (RSUs) and Performance Stock Units (“PSUs”) Activity

A summary of the Company’s stock option activity under the 2013 Plan, 2018 Plan and 2020 Plan for the year ended December 31, 2020 is as follows:

Balance at December 31, 2019

Shares added
Granted
Exercised
Canceled

Balance at December 31, 2020

Vested and exercisable at December 31, 2020

Vested and expected to vest at December 31, 2020

Shares
Available
for Grant

Outstanding
Options

Weighted-
Average
Exercise
Price

2,916,320   
5,587,088   
(7,887,420)  
—   
3,654,776   
4,270,764   

6,906,898    $

—   
4,236,256   
(308,484)  
(3,359,198)  
7,475,472    $

3,925,216    $

7,475,472    $

7.62   
—   
6.37   
3.78   
8.04   
6.88   

6.87   

6.88   

Weighted-
Average
Remaining
Contract
Term
(in Years)

Aggregate
Intrinsic
Value
(in thousands)

6.8    $

5.1    $

6.8    $

5,261 

4,086 

5,261

The total intrinsic value of options exercised was $1.5 million, $5.8 million and $1.5 million for the years ended December 31, 2020, 2019 and 2018, respectively. The
weighted-average estimated fair value of stock options granted was $4.83, $7.12 and $13.20 for the years ended December 31, 2020, 2019 and 2018, respectively.

The aggregate intrinsic value of options exercisable was $4.1 million and $7.3 million as of December 31, 2020 and 2019, respectively.

In September 2020, the board of directors granted retention stock-based awards to employees covering an aggregate of 3.2 million shares of common stock, including
options to purchase an aggregate of 250,000 shares of common stock and 2,959,850 of restricted stock units. The awards are all time-based vesting and vest over three to
four years.

During the year ended December 31, 2020 the Company issued 13,550 shares in settlement of stock-based compensation awards accounted for as liability awards.

130

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
    
 
  
 
 
 
 
 
    
 
  
 
 
 
 
 
    
 
  
 
 
 
 
 
    
 
  
 
 
 
 
 
 
    
 
 
 
 
    
 
 
 
 
The following table summarizes the Company’s RSU, RSA and PSU activity for the year ended December 31, 2020.

Unvested at December 31, 2019

Granted
Released
Canceled

Unvested at December 31, 2020

Weighted-
Average
Grant Date
Fair Value

9.00 
3.44 
9.00 
4.77 
3.44

Shares

325,887    $
3,651,164    $
(133,020)   $
(921,954)   $
2,922,077    $

As  of  December  31,  2020,  the  total  stock-based  compensation  cost  related  to  options,  RSUs  and  PSUs  granted  but  not  yet  amortized  was  $25.1  million  and  will  be
recognized over a weighted-average period of approximately 3.3 years. The total grant date fair value of RSUs and RSAs vested during the year ended December 31,
2020 was approximately $1.2 million. No RSUs or RSAs vested during 2019 and 2018.

In March 2020, the board of directors granted the Company’s newly hired Chief Executive Officer stock-based awards covering an aggregate of 1.1 million shares of
common stock, including options to purchase an aggregate of 800,000 shares of common stock, 120,000 RSUs, 150,000 PSUs and 30,000 shares of common stock. The
stock-based awards were granted pursuant to the 2020 Plan. See Note 16, “Subsequent Events”.

The 30,000 shares of common stock were fully vested on the date of grant and thus, the related compensation expense of $0.2 million was recognized on the grant date.
The stock options and RSUs will vest subject to continued service through the applicable vesting date.

Valuation of Stock Options

The Company uses the Black-Scholes option-pricing model for determining the estimated fair value and stock-based compensation related to stock options and ESPP
awards.  The  fair  value  of  stock  options  granted  to  employees  was  estimated  on  the  date  of  grant  using  the  Black-Scholes  option  pricing  model  using  the  following
assumptions:

Expected term of options (in years)
Expected stock price volatility
Risk-free interest rate
Expected dividend yield

The valuation assumptions were determined as follows:

2020
6.1

Year Ended December 31,
2019
6.1

92.6%-107.9%    
0.29%-0.52%
—

99.4%-111.3%    
1.59%-2.27%
—

2018
6.1
87.4%-92.6%
2.6%-3.0%
—

Expected Term—The expected term represents the period that the options granted are expected to be outstanding and is determined using the simplified method (based
on the mid-point between the vesting date and the end of the contractual term).

Expected Volatility—The Company used an average historical stock price volatility based on a combined weighted average of the Company’s historical average volatility
and that of a selected peer group of comparable public companies within the biotechnology and pharmaceutical industry that were deemed to be representative of future
stock price trends as the Company does not have a sufficient historical trading history of its own common stock. The Company will continue to apply this process until a
sufficient amount of historical information regarding the volatility of its own stock price becomes available.

Risk-Free  Interest  Rate—The  Company  based  the  risk-free  interest  rate  over  the  expected  term  of  the  options  based  on  the  constant  maturity  rate  of  U.S.  Treasury
securities with similar maturities as of the date of the grant.

Expected Dividend Yield—The Company has never paid any dividends and does not plan to pay dividends in the foreseeable future. Therefore, the expected dividend
yield is zero.

131

 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
   
   
 
 
 
   
 
   
 
 
The fair value of ESPP awards was not material for all periods presented.

Performance Stock Units

The  PSUs  granted  in  March  2020  vest  as  to  50,000  PSUs  upon  the  attainment  of  (a)  a  volume-weighted  average  per  share  closing  trading  price  of  the  Company’s
common  stock  of  at  least  $36.875  over  a  trailing  30-day  period  or  (b)  a  change  in  control  transaction  in  which  the  price  per  share  to  the  holders  of  the  Company’s
common stock is at least $36.875 and as to 100,000 PSUs (x) at such time as the Company’s market capitalization reaches at least $2.5 billion, as measured based on the
volume weighted-average closing trading price over a trailing 30 day period or (y) a change in control transaction in which the consideration paid to the  Company’s
stockholders is equal to at least $2.5 billion, as determined by the Company’s board of directors.

For the PSU awards, the Company used the Monte-Carlo option pricing model to determine the fair value of awards at the date of grant. The Monte-Carlo option pricing
model  uses  similar  input  assumptions  as  the  Black-Scholes  model;  however,  it  further  incorporates  into  the  fair-value  determination  the  possibility  that  the  market
condition  may  not  be  satisfied.  Compensation  costs  related  to  awards  with  a  market-based  condition  are  recognized  regardless  of  whether  the  market  condition  is
ultimately satisfied. Compensation cost is not reversed if the achievement of the market condition does not occur. The total grant date fair value of the PSU awards was
determined to be $0.7 million and will be recognized as compensation expense over the weighted-average derived service period of approximately 4.3 years.

Performance Contingent Stock Options

During the year ended December 31, 2018, the board of directors granted performance contingent stock option awards exercisable for 53,575 shares, to certain members
of  the  Company’s  executive  team.  These  awards  had  a  weighted  average  exercise  price  of  $3.42  which  was  based  on  the  fair  market  value  on  the  grant  date,  as
determined by the board of directors, and vest upon the successful achievement of one or more specified performance goals.

The  total  estimated  fair  value  of  these  awards  was  $0.4  million  at  the  date  of  grant  and  was  estimated  using  a  Black-Scholes  option-pricing  model  using  the  same
assumptions as the stock options granted to employees with service-based vesting conditions.     

As of December 31, 2019, there were 329,499 total performance contingent stock option awards outstanding with a total grant date fair value of $0.7 million. During the
year ended December 31, 2019, the Company determined that the achievement of the requisite performance conditions was probable and, as a result, compensation cost
of $0.7 million was recognized for these awards. These awards vested during the third quarter of 2019. As of December 31, 2020, the 329,499 performance contingent
stock option awards are still outstanding.

Performance and Market Contingent Stock Options

During  the  year  ended  December  31,  2018,  the  board  of  directors  granted  performance  and  market  contingent  stock  option  awards  exercisable  for  160,727  shares  of
common stock to certain members of the Company’s executive team. These awards had a weighted average exercise price of $3.42, which was based on the fair market
value  on  the  grant  date,  as  determined  by  the  board  of  directors.  The  total  estimated  grant-date  fair  value  of  these  options  was  $1.0  million.  Key  assumptions  in  the
valuation model included expected volatility, a risk-free interest rate, expected dividend yield, and an expected term unique to the terms of these awards.

Under the performance and market contingent awards, 53,575 of the shares have three separate market triggers for vesting based upon (i) the closing of a financing where
the Company sells shares of its equity securities to institutional investors at a minimum price per share, (ii) a change in control with aggregate proceeds payable for the
Company’s common stock at a minimum price per share, or (iii) an initial public offering that becomes effective at a minimum specified price per share. The remaining
107,152  shares  have  three  separate  market  triggers  for  vesting  based  upon  (i)  the  closing  of  a  financing  where  the  Company  sells  shares  of  its  equity  securities  to
institutional  investors  at  a  minimum  pre-money  valuation,  (ii)  a  change  in  control  with  minimum  aggregate  proceeds  payable  for  the  Company’s  common  stock  at  a
minimum  price  per  share,  or  (iii)  either  an  initial  public  offering  or  an  achievement  of  a  minimum  market  capitalization,  as  measured  by  a  trailing  30  day  volume-
weighted average price.  

By definition, the market condition in these awards can only be achieved after the performance condition of a liquidity event has been achieved. As such, the requisite
service period is based on the estimated period over which the market condition can be achieved. When a performance goal is deemed to be probable of achievement,
which for

132

 
liquidity events is generally upon achievement, time-based vesting and recognition of stock-based compensation expense commence.  

As of December 31, 2020 and 2019, there were 87,521 and 454,584 performance and market contingent stock option awards outstanding with a grant date total fair value
of $0.3 million and $1.5 million, respectively. As of December 31, 2020 and 2019, the Company determined that the achievement of the requisite performance conditions
was not probable and, as a result, no compensation cost was recognized for these awards.

2018 Employee Stock Purchase Plan

In March 2018, the Company’s board of directors adopted the Company’s 2018 Employee Stock Purchase Plan (the “2018 ESPP”). The 2018 ESPP was approved by the
Company’s stockholders in April 2018 and became effective on May 2, 2018. The 2018 ESPP reserved 536,242 shares of common stock for issuance pursuant to future
awards, as well as any automatic increases in the number of shares of the Company’s common stock reserved for future issuance under this plan.  

Under the 2018 ESPP, employees are offered the option to purchase the Company’s common stock at a discount during the offering periods, at semi-annual intervals,
with their accumulated payroll deductions. The option purchase price will be 85% of the lower of the closing trading price per share at the beginning of the offering
period or at the purchase date. The 2018 ESPP provides for consecutive offering periods and eligible employees may elect to withhold up to 15% of their compensation
through payroll deductions during the offering period for the purchase of stock. The maximum number of shares that may be purchased by any one participant is limited
to  15,000  shares  in  each  offering  period  and  $25,000  in  fair  market  value  during  any  calendar  year  per  the  Internal  Revenue  Code  limits.  The  first  offering  period
commenced on September 16, 2018.

Stock-Based Compensation Expense

The following table sets forth the total stock-based compensation expense and costs associated with the Company’s 2018 ESPP included in the Company’s statement of
operations (in thousands):

Research and development
General and administrative

Total

2020

Year Ended December 31,
2019

2018

  $

  $

6,563    $
7,250 
13,813    $

4,979    $
5,873 
10,852    $

6,043 
3,398 
9,441

Stock-based compensation for the year ended December 31, 2020 includes $0.1 million of expense related to awards accounted for as liability awards.

During the years ended December 31, 2020 and 2019, stock-based compensation expense recognized related to nonemployee options was $0.3 million and $0.4 million,
respectively.

13. Net Loss per Common Share

Basic net loss per share is calculated by dividing net loss by the weighted average number of shares outstanding for the period. Diluted net loss per share is calculated by
dividing net loss by the weighted average number of shares of common stock and potential dilutive common stock equivalents outstanding during the period if the effect
is dilutive.

The calculation of diluted earnings (loss) per share also requires that, to the extent contingencies are satisfied during the period and the presumed issuance of additional
shares as contingent consideration is dilutive to earnings (loss) per share for the period, adjustments to net income or net loss used in the calculation are required to
remove  the  change  in  fair  value  of  the  contingent  consideration  liability  for  the  period.  Likewise,  adjustments  to  the  denominator  are  required  to  reflect  the  related
dilutive  shares.  In  all  periods  presented,  the  Company’s  outstanding  stock  options,  RSUs  (including  PSUs),  early  exercised  common  stock  subject  to  future  vesting,
restricted stock accounted for as options, shares subject to the 2018 ESPP and presumed issuance of additional shares as contingent consideration were excluded from the
calculation of diluted net loss per share because their effects were antidilutive.

133

 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
  
 
 
A  reconciliation  of  the  numerators  and  denominators  used  in  computing  net  loss  from  continuing  operations  per  share  is  as  follows  (in  thousands,  except  per  share
amounts):

Numerator:
Net loss

Denominator:
Weighted average number of shares outstanding—basic
   and diluted
Net loss per share—basic and diluted

2020

December 31,
2019
(in thousands, except share and per share amounts)

2018

  $

(93,844)

 $

(82,177)

 $

(76,398)

  $

50,864,889 
(1.84)

 $

43,624,807 
(1.88)

 $

28,269,907 
(2.70)

Since the Company was in a loss position for all periods presented, basic net loss per common share is the same as diluted net loss per common share as the inclusion of
all potential common shares outstanding would have been anti-dilutive. Potentially dilutive securities that were not included in the diluted per share calculations because
they would be anti-dilutive were as follows:

Options to purchase common stock
Early exercised common stock subject to future vesting
Restricted stock accounted for as options
RSUs
PSUs
Shares subject to the 2018 ESPP
Total

2020

7,540,472   
66,741   
—   
2,832,077   
150,000   
111,383   
10,700,673   

Year Ended December 31,
2019

2018

6,906,898   
146,915   
—   
325,887   
—   
47,597   
7,427,297   

5,500,531 
704,028 
359,228 
— 
— 
27,622 
6,591,409

Up  to  89,900  shares  may  be  contingently  issued,  if  certain  performance  conditions  are  met  under  the  Company’s  in-licensing  agreements.  See  Note  5,  “License
Agreements and Strategic Investment,” to the Company’s financial statements for additional information.

14. Defined Contribution Plan

The Company sponsors a 401(k) Plan that stipulates that eligible employees can elect to contribute to the 401(k) Plan, subject to certain limitations, on a pretax basis. In
January  2019,  the  Company  began  to  match  4%  of  employees’  salary.  During  the  years  ended  December  31,  2020  and  2019,  the  Company  recorded  matching
contributions of $0.6 million and $0.8 million, respectively.

15. Income Taxes

The Company has incurred net operating losses for all the periods presented. The Company has not reflected the benefit of any such net operating loss carryforwards in
the accompanying financial statements. The Company has established a full valuation allowance against its deferred tax assets due to the uncertainty surrounding the
realization of such assets. All losses to date have been incurred domestically as the Company has no international operations or subsidiaries.

No provision for U.S. income taxes exists due to tax losses incurred in all periods presented. All losses incurred were U.S. based.

134

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
   
 
 
 
 
    
 
    
 
  
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The effective tax rate for the years ended December 31, 2020, 2019 and 2018 is different from the federal statutory rate primarily due to the valuation allowance against
deferred tax assets as a result of insufficient sources of income. The effective tax rate of the Company’s provision for income taxes differs from the federal statutory rate
as follows:

Taxes at the U.S. statutory income tax rate
State tax, net of federal benefit
Other
Stock-based compensation
Research and development tax credits
Reduction to state net operating losses
Change in valuation allowance

Total provision for income taxes

2020

Year Ended December 31,
2019

2018

21.0  %  
—   
0.9   
(0.7)  
2.2   
0.1   
(23.5)  

—  %  

21.0  %  
(2.2)  
(0.9)  
(0.5)  
(0.2)  
(3.9)  
(13.3)  

—  %  

21.0  %
0.9   
(0.1)  
0.3   
1.0   
—   
(23.1)  

—  %

Deferred income taxes reflect the net tax effects of (a) temporary differences between the carrying amounts of assets and liabilities for financial reporting purposes and
the amounts used for income tax purposes, and (b) operating losses and tax credit carryforwards.

The tax effects of significant items comprising the Company’s deferred income taxes are as follows:

Deferred tax assets:

Federal and state operating loss carryforwards
Research and development tax credits
Stock-based compensation
Accruals and other
Intangibles
Contingent consideration
Charitable contributions
Operating lease liabilities

Total deferred tax assets
Deferred tax liabilities:

Operating lease right-of-use assets
Fixed assets
Unrealized gain on equity investment

Total deferred tax liabilities
Valuation allowance
Net deferred tax assets

December 31,

2020

2019

(in thousands)

  $

57,126    $
5,411   
4,326   
1,145   
1,181   
—   
254   
8,203   
77,646   

(4,946)  
(1,750)  
—   
(6,696)  
(70,950)  

  $

—    $

40,435 
3,436 
3,514 
1,232 
241 
670 
253 
— 
49,781 

— 
— 
(947)
(947)
(48,834)
—

The tax benefit of net operating losses, temporary differences and credit carryforwards should be recorded as an asset to the extent that management assesses that their
realization  is  "more  likely  than  not."  Realization  of  the  future  tax  benefits  is  dependent  on  the  Company's  ability  to  generate  sufficient  taxable  income  within  the
carryforward  period.  Because  of  the  Company's  recent  history  of  operating  losses,  management  believes  that  recognition  of  the  deferred  tax  assets  arising  from  the
above-mentioned future tax benefits is currently not likely to be realized and, accordingly, has provided a valuation allowance.

Realization of the net deferred tax assets is dependent upon future taxable income, if any, the amount and timing of which is uncertain. Based on the weight of available
positive and negative objective evidence, management believes it more likely than not that the Company’s deferred tax assets are not realizable. Accordingly, the net
deferred  tax  assets  have  been  fully  offset  by  a  valuation  allowance.  The  valuation  allowance  increased  by  $22.1  million  and  $11.0  million  during  the  years  ended
December 31, 2020 and 2019, respectively.

135

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
    
 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net operating losses and tax credit carryforwards as of December 31, 2020 are as follows:

Net operating losses, federal (post December 31, 2017)
Net operating losses, federal (pre January 1, 2018)
Net operating losses, state
Research and development tax credits, federal
Research and development tax credits, state

  $

Amount
(in thousands)

207,752   
64,136   
26,589   
5,874   
4,949   

Expiration Years
Do Not Expire
2029-2037
2029-2036
2034-2040
Indefinite

Federal and state laws impose restrictions on the utilization of net operating loss carryforwards and R&D credit carryforwards in the event of a change in ownership of
the Company, which constitutes an 'ownership change' as defined by Internal Revenue Code Section 382 and 383. The Company experienced an ownership change in the
past that impacts the availability of its net operating losses and tax credits. The amounts indicated in the above tables reflect the reduction of net operating losses and
credit carryforwards as a result of previous ownership changes that the Company experienced. Should there be additional ownership changes in the future, the Company's
ability to utilize existing carryforwards could be substantially restricted.

The Company determines its uncertain tax positions based on a determination of whether and how much of a tax benefit taken by the Company in its tax filings is more
likely than not to be sustained upon examination by the relevant income tax authorities.

The following table summarizes the activity related to the Company’s unrecognized tax benefits:

Gross unrecognized tax benefits at January 1
Additions for tax positions taken in the current year
Reductions for tax positions taken in the prior year
Gross unrecognized tax benefits at December 31

December 31,

2020

2019

(in thousands)
9,762    $
255   
(2,875)  
7,142    $

3,714 
6,221 
(173)
9,762

  $

  $

If  recognized,  none  of  the  unrecognized  tax  benefits  as  of  December  31,  2020  and  2019  would  reduce  the  annual  effective  tax  rate,  primarily  due  to  corresponding
adjustments to the valuation allowance. The Company will recognize both accrued interest and penalties related to unrecognized benefits in income tax expense. As of
December 31, 2020 and 2019, no liability has been recorded for potential interest or penalties. The Company does not expect the unrecognized tax benefits to change
significantly over the next 12 months.

The Company files income tax returns in the U.S. federal jurisdiction and California and Colorado. The Company is not currently under audit by the Internal Revenue
Service or other similar state or local authorities. All tax years remain open to examination by major taxing jurisdictions to which the Company is subject.

16. Subsequent Events

In January 2021, the board of directors granted the Company’s Chief Executive Officer stock-based awards covering an aggregate of 400,000 shares of common stock,
including options to purchase an aggregate of 150,000 shares of common stock and 250,000 RSUs. The stock-based awards were granted pursuant to the 2018 Plan. 
During the first quarter of 2021, the board of directors granted to new executives an additional 580,000 options to purchase common stock.  These stock-based awards
were granted pursuant to the 2020 Plan.  The stock options and RSUs will vest subject to continued service through the applicable vesting dates.

Subsequent  to  the  year  ended  December  31,  2020,  the  Company  has  issued  and  sold  1,187,068  shares  of  its  common  stock  through  its  ATM  Offering  Program  and
received  net  proceeds  of  approximately  $8.7  million,  after  deducting  commissions  and  other  offering  expenses  of  $0.3  million.    The  Company  also  issued  and  sold
33,561 shares of its common stock through its Additional ATM Offering Program and received net proceeds of approximately $0.3 million, after deducting commissions
and other offering expenses of $8,500. 

136

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
17. Selected Quarterly Financial Data (Unaudited)

The  following  tables  show  a  summary  of  the  Company’s  quarterly  financial  information  for  each  of  the  four  quarters  of  2020  and  2019  and  have  been  prepared  in
accordance with GAAP for interim financial reporting  (in thousands, except for per share data):

Year Ended December 31, 2020
Loss from operations
Net loss
Net loss per common share, basic and diluted

Year Ended December 31, 2019
Loss from operations
Net loss
Net loss per common share, basic and diluted

Quarter

First

Second

Third

Fourth

(27,156)  $
(28,038)  $
(0.59)  $

(23,349)  $
(18,667)  $
(0.38)  $

(24,642)  $
(27,552)  $
(0.52)  $

(18,783)
(19,587)
(0.37)

Quarter

First

Second

Third

Fourth

(19,737)
(18,767)
(0.44)

 $
 $
 $

(24,470)
(23,673)
(0.56)

 $
 $
 $

(22,354)
(21,710)
(0.51)

 $
 $
 $

(23,090)
(18,027)
(0.39)

  $
  $
  $

  $
  $
  $

137

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Item 9. Changes in and Disagreements With Accountants on Accounting and Financial Disclosure.

None.

Item 9A. Controls and Procedures.

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our chief executive and financial officers, evaluated the effectiveness of our disclosures controls and procedures, as defined in
Rules 13a-15(e) and 15d-15(e) under the Exchange Act, as of December 31, 2020. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-
15(e) under the Exchange Act, means controls and other procedures of a company that are designed to ensure that information required to be disclosed by a company in
the reports that it files or submits under the Exchange Act is recorded, processed, summarized, and reported within the time periods specified in the SEC’s rules and
forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by a company
in the reports that it files or submits under the Exchange Act is accumulated and communicated to the company’s management, including its principal executive and
principal financial officers, as appropriate, to allow timely decisions regarding required disclosure. Management recognizes that any controls and procedures, no matter
how well designed and operated, can provide only reasonable assurance of achieving their objectives and management necessarily applies its judgment in evaluating the
cost-benefit  relationship  of  possible  controls  and  procedures.  Based  on  the  evaluation  of  our  disclosure  controls  and  procedures  as  of  December  31,  2020,  our  chief
executive officer and chief financial officer concluded that, as of such date, our disclosure controls and procedures were effective at a reasonable assurance level.

Management’s Annual Report on Internal Control over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over financial reporting, as such term is defined in Rule 13a-15(f) under the
Securities Exchange Act of 1934. Our internal control over financial reporting is designed to provide reasonable assurance regarding the reliability of financial reporting
and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles in the United States and includes those
policies and procedures that:

•

•

•

Pertain to the maintenance of records that accurately and fairly reflect in reasonable detail the transactions and dispositions of the assets of our company;

Provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted
accounting principles, and that our receipts and expenditures are being made only in accordance with authorizations of our management and directors; and

Provide reasonable assurances regarding prevention or timely detection of unauthorized acquisition, use or disposition of our assets that could have a
material adverse effect on our financial statements.

Our management assessed the effectiveness of our internal control over financial reporting as of December 31, 2020. In making this assessment, management used the
criteria set forth by the Committee of Sponsoring Organizations of the Treadway Commission (COSO) in Internal Control-Integrated Framework (2013 framework).
Based on our assessment, management concluded our internal control over financial reporting was effective as of December 31, 2020, based on the COSO criteria.

Attestation Report of the Registered Public Accounting Firm

This Annual Report on Form 10-K does not include an attestation report of our registered public accounting firm due to an exemption established by the JOBS Act for
“emerging growth companies.”

Inherent Limitations on Effectiveness of Controls and Procedures

In designing and evaluating the disclosure controls and procedures, management recognizes that any controls and procedures, no matter how well designed and operated,
can provide only reasonable assurance of achieving the desired control objectives. In addition, the design of disclosure controls and procedures must reflect the fact that
there are resource constraints and that management is required to apply judgment in evaluating the benefits of possible controls and procedures relative to their costs.

138

 
 
 
 
 
Changes in Internal Control over Financial Reporting

Management determined that, as of December 31, 2020, there were no changes in our internal control over financial reporting that occurred during the fiscal quarter then
ended that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

Item 9B. Other Information.

None.

139

 
 
Item 10. Directors, Executive Officers and Corporate Governance.

PART III

Information required by this Item is incorporated herein by reference to the sections titled “Executive Officers,” “Election of Directors,” “Corporate Governance” and
“Section 16(a) Beneficial Ownership and Reporting Compliance” in our Definitive Proxy Statement with respect to our 2021 Annual Meeting of Stockholders to be filed
with the SEC within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K.

Item 11. Executive Compensation.

Information  required  by  this  Item  is  incorporated  herein  by  reference  to  the  section  titled  “Executive  Compensation,”  “Director  Compensation”  and  “Corporate
Governance”  in our Definitive Proxy Statement with respect to our 2021 Annual Meeting of Stockholders to be filed with the SEC within 120 days after the end of the
fiscal year covered by this Annual Report on Form 10-K.

Item 12. Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters.

Information  required  by  this  Item  is  incorporated  herein  by  reference  to  the  section  titled  “Security  Ownership  of  Certain  Beneficial  Owners  and  Management”  and
“Equity Compensation Plan Information” in our Definitive Proxy Statement with respect to our 2021 Annual Meeting of Stockholders to be filed with the SEC within
120 days after the end of the fiscal year covered by this Annual Report on Form 10-K.

Item 13. Certain Relationships and Related Transactions, and Director Independence.

Information  required  by  this  Item  is  incorporated  herein  by  reference  to  the  section  titled  “Certain  Relationships  and  Related  Party  Transactions”  and  “Corporate
Governance” in our Definitive Proxy Statement with respect to our 2021 Annual Meeting of Stockholders to be filed with the SEC within 120 days after the end of the
fiscal year covered by this Annual Report on Form 10-K.

Item 14. Principal Accounting Fees and Services.

Information required by this Item is incorporated herein by reference to the section titled “Ratification of Selection of Independent Registered Public Accounting Firm”
in our Definitive Proxy Statement with respect to our 2021 Annual Meeting of Stockholders to be filed with the SEC within 120 days after the end of the fiscal year
covered by this Annual Report on Form 10-K.

140

 
 
Item 15. Exhibits, Financial Statement Schedules.

(a) The following documents are filed as part of this report:

1. Financial Statements

PART IV

See Index to Financial Statements in Part II Item 8 of this Annual Report on Form 10-K.

2. Financial Statement Schedules

All schedules are omitted because they are not applicable or the required information is shown in the financial statements or notes thereto.

3. Exhibits

141

 
 
Exhibit
Number

1.1

3.1
3.2
4.1
4.2
4.3

4.4

10.1(a)

10.1(b)

10.2(a)

10.2(b)

10.2(c)

10.3(a)#
10.3(b)#
10.4(a)#
10.4(b)#

10.4(c)#

10.4(d)#

10.5#
10.6#

10.7#
10.8#

10.9#

10.10#

10.11#

10.12#

Exhibit Index

Description

  Sales Agreement, dated July 31, 2020, by and between Unity Biotechnology, Inc. and
Cowen and Company, LLC.
  Amended and Restated Certificate of Incorporation of Unity Biotechnology, Inc.
  Amended and Restated Bylaws of Unity Biotechnology, Inc.
  Reference is made to exhibits 3.1 through 3.2.
  Form of Common Stock Certificate.
  Amended and Restated Investors’ Rights Agreement, dated as of March 15, 2018, by and
among Unity Biotechnology, Inc. and the investors party thereto.
  Description of Unity’s Securities Registered Pursuant to Section 12 of the Securities
Exchange Act of 1934.
  Lease Agreement, dated as of May  13, 2016, by and between Unity Biotechnology, Inc.
and BMR-Bayshore Boulevard L.P.
  First Amendment to Lease Agreement, dated as of May 23, 2017, by and between Unity
Biotechnology, Inc. and BMR-Bayshore Boulevard L.P.
  Space License Agreement, dated as of October 20, 2016, by and between Unity
Biotechnology, Inc. and BMR-Bayshore Boulevard L.P.
  First Amendment to Space License Agreement, dated as of December 5, 2016, by and
between Unity Biotechnology, Inc. and BMR-Bayshore Boulevard L.P.
  Second Amendment to Space License Agreement, dated as of January 30, 2017, by and
between Unity Biotechnology, Inc. and BMR-Bayshore Boulevard L.P.
  2013 Equity Incentive Plan.
  Form of Stock Option Agreement under 2013 Equity Incentive Plan.
  2018 Incentive Award Plan.
  Form of Stock Option Grant Notice and Stock Option Agreement under the 2018
Incentive Award Plan.
  Form of Restricted Stock Award Grant Notice and Restricted Stock Award Agreement
under the 2018 Incentive Award Plan.
  Form of Restricted Stock Unit Award Grant Notice and Restricted Stock Unit Award
Agreement under the 2018 Incentive Award Plan.
  2018 Employee Stock Purchase Plan.
  Amended and Restated Non-Employee Director Compensation Program (Effective
January 1, 2019)
  Form of Indemnification Agreement for directors and officers.
  Employment Agreement, dated January 29, 2018, by and between Unity Biotechnology,
Inc. and Keith R. Leonard Jr.
  Employment Agreement, dated January 29, 2018, by and between Unity Biotechnology,
Inc. and Nathaniel E. David.
  Employment Agreement, dated January 29, 2018, by and between Unity Biotechnology,
Inc. and Robert C. Goeltz II.
  Employment Agreement, dated January 29, 2018, by and between Unity Biotechnology,
Inc. and Jamie Dananberg.
  Employment Agreement, dated January 29, 2018, by and between Unity Biotechnology,
Inc. and Daniel G. Marquess.

142

Incorporated by Reference

Form
10-Q

Number
1.1

  Filing Date
7-31-20

Filed
Herewith

8-K
8-K

S-1
S-1

10-K

S-1

S-1

S-1

S-1

S-1

S-1
S-1
S-1
S-1

S-1

S-1

S-1
10-K

S-1
S-1

S-1

S-1

S-1

S-1

3.1
3.2

4.2
4.3

4.4

5-7-18
5-7-18

4-23-18
4-5-18

3-11-20

10.1(a)

4-5-18

10.1(b)

4-5-18

10.2(a)

4-5-18

10.2(b)

4-5-18

10.2(c)

4-5-18

10.3(a)
10.3(b)
10.4(a)
10.4(b)

4-5-18
4-5-18
4-23-18
4-5-18

10.4(c)

4-5-18

10.4(d)

4-5-18

10.5
10.6

10.7
10.8

10.9

4-23-18
3-6-19

4-5-18
4-5-18

4-5-18

10.10

4-5-18

10.11

4-5-18

10.12

4-5-18

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
10.13#

10.14+

10.15+

10.16†

10.17+

10.18+

10.19(a)+

10.19(b)+

10.19(c)†

10.19(d)+

10.19(e)+

10.19(f)+

10.19(g)+

10.20+

10.21+

10.22††

10.23

  Employment Agreement, dated January 29, 2018, by and between Unity Biotechnology,
Inc. and Tamara L. Tompkins.
  Compound Library and Option Agreement, dated as of February 2, 2016, by and between
Ascentage Pharma Group Corp. Ltd. and Unity Biotechnology, Inc.
  APG1252 License Agreement, dated as of February 2, 2016, by and between Ascentage
Pharma Group Corp. Ltd. and Unity Biotechnology, Inc.
  Research Services Agreement, dated as of February 2, 2016, by and between Ascentage
Pharma Group Corp. Ltd. and Unity Biotechnology, Inc.
  Amendment to APG1252 License Agreement, dated as of February 2, 2016, by and
between Ascentage Pharma Group Corp. Ltd.
  Amendment to Compound Library and Option Agreement, dated as of February 2, 2016,
by and between Ascentage Pharma Group Corp. Ltd. and Unity Biotechnology, Inc.
  Exclusive License Agreement, dated as of June 28, 2013, by and between the Mayo
Foundation for Medical Education and Research and Unity Biotechnology, Inc.
  Amendment No. 1 to Exclusive License Agreement, dated as of September 10, 2014, by
and between the Mayo Foundation for Medical Education and Research and Unity
Biotechnology, Inc.
  Amendment No. 2 to Exclusive License Agreement, dated as of November 17, 2014, by
and between the Mayo Foundation for Medical Education and Research and Unity
Biotechnology, Inc.
  Amendment No. 3 to Exclusive License Agreement, dated as of May 5, 2015, by and
between the Mayo Foundation for Medical Education and Research and Unity
Biotechnology, Inc.
  Amendment No. 4 to Exclusive License Agreement, dated as of September 15, 2016, by
and between the Mayo Foundation for Medical Education and Research and Unity
Biotechnology, Inc.
  Addendum to Amendment No. 4 to Exclusive License Agreement, dated as of September
15, 2016, by and between the Mayo Foundation for Medical Education and Research and
Unity Biotechnology, Inc.
  Amendment No. 5 to Exclusive License Agreement, dated as of October 17, 2016, by and
between the Mayo Foundation for Medical Education and Research and Unity
Biotechnology, Inc.
  Amended and Restated License Agreement, dated as of January 27, 2017, by and between
the Buck Institute for Research on Aging and Unity Biotechnology, Inc.
  License Agreement, dated as of November 3, 2016, by and between The Johns Hopkins
University and Unity Biotechnology, Inc.
  License Agreement for APG1197, dated as of January 2, 2019, by and between Ascentage
Pharma Group Corp. Ltd. And Unity Biotechnology, Inc.
  Lease Agreement, dated as of February 28, 2019, by and between Unity Biotechnology,
Inc. and Bayside Area Development, LLC

143

S-1

10.13

4-5-18

S-1

10.16

4-5-18

S-1

  10.19(c)

4-23-18

10-K

10-K

10.22

3-6-19

10.23

3-6-19

X

X

X

X

X

X

X

X

X

X

X

X

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
8-K

10.1

  11-25-19

10-K

10-K

10-K

10-K

10-K

10-K

10-K

8-K

10-Q

8-K

10-Q

10-Q

8-K

10.25

10.26

3-11-20

3-11-20

10.27

3-11-20

10.28

3-11-20

10.29

3-11-20

10.30

3-11-20

10.31

3-11-20

10.1

10.2

10.1

10.2

10.3

10.1

3-30-20

5-7-20

7-1-20

11-4-20

11-4-20

8-4-20

10.24††††

10.25†††

10.26††††

10.27#

10.28#

10.29#

10.30#

10.31#

10.32#

10.33#

10.34†††

10.35#

10.36#

10.37†††

10.38#

23.1
24.1
  31.1

  31.2

  32.1**

  First Amendment to Compound License Agreement for APG1197, dated as of November
19, 2019, by and between Ascentage Pharma Group Corp. Ltd. and Unity Biotechnology,
Inc.
  Second Amendment to APG1252 License Agreement, dated as of November 19, 2019, by
and between Ascentage Pharma Group Corp. Ltd. and Unity Biotechnology, Inc.
  Second Amendment to Compound Library and Option Agreement, dated as of January 8,
2020, by and between Ascentage Pharma Group Corp. Ltd. and Unity Biotechnology, Inc.
  Amendment to Employment Agreement, dated March 9, 2020, by and between Unity
Biotechnology, Inc. and Nathaniel E. David.
  Amendment to Employment Agreement, dated March 9, 2020, by and between Unity
Biotechnology, Inc. and Robert C. Goeltz II.
  Amendment to Employment Agreement, dated March 9, 2020, by and between Unity
Biotechnology, Inc. and Jamie Dananberg.
  Amendment to Employment Agreement, dated March 9, 2020, by and between Unity
Biotechnology, Inc. and Daniel G. Marquess.
  Amendment to Employment Agreement, dated March 9, 2020, by and between Unity
Biotechnology, Inc. and Tamara L. Tompkins.
  Employment Agreement, dated March 30, 2020, by and between Unity Biotechnology,
Inc. and Anirvan Ghosh.
  Amended and Restated Non-Employee Director Compensation Program (effective as of
March 30, 2020)
  Third Amendment to Compound License Agreement for APG-1197, dated June 29, 2020,
by and between Ascentage Pharma Group Corp. Ltd. and Unity Biotechnology, Inc.
  Employment Agreement, dated August 1, 2020, by and between Unity Biotechnology, Inc.
and Lynne Sullivan.
  Amendment to Employment Agreement, dated September 1, 2020, by and between Unity
Biotechnology, Inc. and Lynne Sullivan.
  Loan and Security Agreement, dated August 3, 2020, between Unity Biotechnology, Inc.
and Hercules Capital. Inc.

  Transition and Separation Agreement, dated December 12, 2020, by and between
Nathaniel David and Unity Biotechnology, Inc.
  Consent of Independent Registered Public Accounting Firm
  Power of Attorney. Reference is made to the signature page.
  Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a)
under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002.
  Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a)
under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the
Sarbanes-Oxley Act of 2002.
  Certification of Principal Executive Officer and Principal Financial Officer Pursuant to 18
U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of
2002.

144

X

X
X
X

X

X

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
   
 
   
   
   
 
   
   
   
 
101.INS

101.SCH
101.CAL
101.DEF
101.LAB
101.PRE
104

  Inline XBRL Instance Document – the instance document does not appear in the
Interactive Data File because its XBRL tags are embedded within the Inline XBRL
document.
  Inline XBRL Taxonomy Extension Schema Document
  Inline XBRL Taxonomy Extension Calculation Linkbase Document
  Inline XBRL Taxonomy Extension Definition Linkbase Document
  Inline XBRL Taxonomy Extension Label Linkbase Document
  Inline XBRL Taxonomy Extension Presentation Linkbase Document
  Cover Page Interactive Data File (formatted as inline XBRL and contained in Exhibit 101)    

X

X
X
X
X
X
X

†

††

†††

††††

+

#
**

Confidential  treatment  has  been  granted  for  certain  information  contained  in  this  exhibit.  Such  information  has  been  omitted  and  filed  separately  with  the
Securities and Exchange Commission.
Portions  of  this  exhibit  (indicated  by  asterisks)  have  been  omitted  pursuant  to  a  request  for  confidential  treatment  filed  separately  with  the  Securities  and
Exchange Commission.
Portions of this exhibit (indicated by asterisks) have been omitted pursuant to Regulation S-K, Item 601(b)(10). Such omitted information is not material and
would likely cause competitive harm to the registrant if publicly disclosed.
Portions of this exhibit (indicated by asterisks) have been omitted pursuant to Regulation S-K, Item 601(b)(10). Such omitted information is not material and
would likely cause competitive harm to the registrant if publicly disclosed. Additionally, schedules and attachments to this exhibit have been omitted pursuant to
Regulation S-K, Item 601(a)(5).
Certain  confidential  portions  of  this  exhibit  have  been  omitted  from  this  exhibit  in  accordance  with  Regulation  S-K  601(b)(10).  Exhibit  being  refiled  upon
expiration of confidential treatment previously granted by the SEC.
Indicates management contract or compensatory plan.
The certification attached as Exhibit 32.1 that accompanies this Annual Report on Form 10-K is not deemed filed with the Securities and Exchange Commission
and is not to be incorporated by reference into any filing of Unity Biotechnology, Inc. under the Securities Act of 1933, as amended, or the Securities Exchange
Act  of  1934,  as  amended,  whether  made  before  or  after  the  date  of  this  Annual  Report  on  Form  10-K,  irrespective  of  any  general  incorporation  language
contained in such filing.

Item 16. Form 10-K Summary.

None.

145

 
   
   
   
 
   
   
   
 
   
   
   
 
   
   
   
 
   
   
   
 
   
   
   
 
   
   
 
 
 
Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, as amended, the Registrant has duly caused this Annual Report

on Form 10-K to be signed on its behalf by the undersigned, thereunto duly authorized.

SIGNATURES

Date: March 23, 2021

Unity Biotechnology, Inc.

By:

/s/ Anirvan Ghosh
Anirvan Ghosh, Ph.D.
Chief Executive Officer

POWER OF ATTORNEY

KNOW  ALL  PERSONS  BY  THESE  PRESENTS,  that  each  person  whose  signature  appears  below  constitutes  and  appoints  each  of  Anirvan  Ghosh,
Alexander Nguyen, and Lynne Sullivan his or her true and lawful attorney-in-fact and agent, with full power of substitution, for him or her and in his or her name, place
and  stead,  in  any  and  all  capacities,  to  sign  any  and  all  amendments  to  this  Annual  Report  on  Form  10-K,  and  to  file  the  same,  with  all  exhibits  thereto,  and  other
documents in connection therewith, with the U.S. Securities and Exchange Commission, granting unto said attorneys-in-fact and agents, and each of them, full power and
authority to do and perform each and every act and thing requisite and necessary to be done in connection therewith, as fully to all intents and purposes as he or she
might or could do in person, hereby ratifying and confirming that all said attorneys-in-fact and agents, or their, his or her substitutes or substitutes, may lawfully do or
cause to be done by virtue hereof.

146

 
 
 
 
 
 
 
 
 
 
 
 
Pursuant to the requirements of the Securities Exchange Act of 1934, this Annual Report on Form 10-K has been signed by the following persons on behalf

of the Registrant in the capacities and on the dates indicated.

Name

Title

Date

/s/ Anirvan Ghosh
Anirvan Ghosh, Ph.D.

/s/ Lynne Sullivan
Lynne Sullivan

/s/ Keith R. Leonard Jr.
Keith R. Leonard Jr.

/s/ Paul L. Berns
Paul L. Berns

/s/ Kristina M. Burow
Kristina M. Burow

/s/ Graham K. Cooper
Graham K. Cooper

/s/ Nathaniel E. David
Nathaniel E. David, Ph.D.

/s/ Gilmore O’Neill
Gilmore O’Neill, M.B.

/s/ Margo Roberts
Margo Roberts, Ph.D.

/s/ Camille D. Samuels
Camille D. Samuels

Chief Executive Officer and Director
(Principal Executive Officer)

Chief Financial Officer
(Principal Financial and Accounting Officer)

  Chairman

  Director

  Director

  Director

  Director

  Director

  Director

  Director

147

March 23, 2021

March 23, 2021

March 23, 2021

March 23, 2021

March 23, 2021

March 23, 2021

March 23, 2021

March 23, 2021

March 23, 2021

March 23, 2021

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit 10.14

COMPOUND LIBRARY AND OPTION AGREEMENT

This Compound Library and Option Agreement (the “Agreement”),  dated as of February  2nd, 2016 (the “Signing Date”),  is  made  by  and
between Ascentage Pharma Group Corp. Ltd., a Hong Kong corporation (“Ascentage”), with a business address at 11/F, AXA CENTRE,
Gloucester Road, Wanchai, Hong Kong, and Unity Biotechnology, Inc., a Delaware corporation (“Unity”), with a business address at 1700
Owens Street, Suite 535, San Francisco, California 95158.  Ascentage and Unity are sometimes referred to herein as individually as a party
and collectively as the parties.

BACKGROUND

A.
conditions;

Ascentage  is  in  the  business  of  developing  and  commercializing  therapeutic  agents  for  the  treatment  of  cancer  and  related

B.
conditions;

Unity  is  in  the  business  of  developing  and  commercializing  therapeutic  agents  intended  to  delay  aging  and  treat  age-related

C.Unity  and  Ascentage  have  entered  into  that  certain  license  agreement  (the  “APG-1252  License  Agreement”)  of  even  date  herewith
pursuant to which Unity obtained a license to commercialize that certain BCL-2/BCL-xL inhibitor known as “APG-1252” for treatment of
age-related conditions.

D.Ascentage possesses a collection of additional BCL-2/BCL-xL inhibitor compounds, some of which may be useful in the treatment of age-

related conditions;

E.Unity  and  Ascentage  have  entered  into  a  research  agreement  of  even  date  herewith  pursuant  to  which  Unity  will  fund  research  by

Ascentage intended to discover additional BCL-2/BCL-xL inhibitor compounds;  

F.Unity desires to obtain the right to screen Ascentage’s collection of BCL-2/BCL-xL inhibitor compounds as well as any additional BCL-
2/BCL-xL inhibitor compounds discovered by Ascentage during the term of this Agreement (including any such compounds discovered
pursuant to the aforementioned research agreement) to identify compounds with potential utility in the treatment of age-related conditions
other than Oncology Indications (as defined below);

G.Ascentage is willing to permit Unity to conduct the above described screening on the terms and conditions set forth in this Agreement.

NOW, THEREFORE, for and in consideration of the covenants, conditions and undertakings hereinafter set forth, it is agreed by

and between the parties as follows:

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
As used herein, the following terms will have the meanings set forth below:

ARTICLE 1

DEFINITIONS

1.1

“Active Compound” means an Ascentage Active Compound or a Unity Active Compound, as applicable.

1.2

“Affiliate” means with respect to a particular party, another person that controls, is controlled by or is under common
control with such party. For the purposes of the definition in this Section 1.2, the word "control" (including, with correlative meaning, the
terms  "controlled  by"  or  "under  the  common  control  with")  means  the  actual  power,  either  directly  or  indirectly  through  one  or  more
intermediaries,  to  direct  or  cause  the  direction  of  the  management  and  policies  of  such  entity,  whether  by  the  ownership  of  at  least  fifty
percent (50%) of the voting stock of such entity, or by contract or otherwise.

1.3

 “Ascentage Active Compound” means any Compound designated by Ascentage as an Active Compound in accordance

with the Section 2.6.

1.4

  “Ascentage  Future  Compounds”  means  any  BCL-2/BCL-xL  inhibitor  compounds  generated  by  or  on  behalf  of

Ascentage during the Term, but specifically excluding Unity Future Compounds.

1.5

“Ascentage Intellectual Property” means all Patents and Technology owned or Controlled by Ascentage or its Affiliates

during the Term.

1.6

“Carved Out Indication” means any indication that is not an Oncology Indication and that [***] a

compound that acts through the BCL-2 pathway to the [***] (e.g., [***]).

1.7

“Collaboration Period” means the period of time commencing on the Effective Date and continuing until expiration or

earlier termination of the Research Agreement.

1.8

“Compounds”  means  (a)  the  Existing  Compounds,  (b)  the  Future  Ascentage  Compounds,  and  (iii)  the  Unity

Compounds, and “Compound” means a single compound from any of the foregoing categories of compounds.

1.9

“Compound  Information”  means  with  respect  to  a  given  Compound,  a  brief  summary  of  all  material  data  readily

available and known to Ascentage that relate to the biological activity of such Compound.

1.10

“Compound-Related  Patents”  means  Patents  within  the  Ascentage  Intellectual  Property  that  are  directed  to  one  or

more Compounds.

1.11

“Compound Screening” has the meaning provided in Section 2.4.

1.12

“Control”  and  its  correlative  terms,  “Controlled”  or  “Controls”  shall  mean,  with  respect  to  any  Patent  or  item  of
Technology, that a Party or one of its Affiliates owns or possesses rights to such Patent or item of Technology sufficient to grant the access,
license or sublicense

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

2

 
contemplated in this Agreement without violating the terms of any agreement or other arrangement with any Third Party.

1.13

1.14

“Effective Date” shall mean the date on which the Second Amendment takes effect.

“[***]” means the [***] to be negotiated by the parties pursuant to Section 4.2.3(c)(iv).

1.15

 “Exclusive Evaluation Period” shall mean with respect to a given compound, the period commencing on the date of
delivery of the New Compound Report disclosing such compound (and in the case of a Unity Compound, the [***]) and ending on the last
day of the [***] following the [***] in which the Exclusive Evaluation Period commenced.

1.16

“Existing  Compounds”  means  the  [***]  BCL-2/BCL-xL  inhibitor  compounds  collectively  comprising  Ascentage’s
BCL-2/BCL-xL library as of the Effective Date, and includes the [***] BCL-2/BCL-xL inhibitor compounds previously provided to Unity
by  Ascentage  for  analysis  under  that  certain  Materials  Transfer  Agreement  entered  into  by  the  parties  on  March  19,  2015  (“Prior
Compounds”). Notwithstanding the foregoing, APG-1252 shall not be considered an Existing Compound for purposes of this Agreement.

1.17

“Grace Period” means a period of [***] ([***]) to [***] ([***]) [***] following the expiration or earlier termination
of  the  Collaboration  Period.      The  length  of  the  Grace  Period  shall  be  determined  based  on  the  duration  of  the  Collaboration  Period  in
accordance with the following:

Period shall be [***] ([***]) [***];

1.17.1

If  the  duration  of  the  Collaboration  Period  is  [***]  but  less  than  [***],  the  Grace

Period shall be [***] ([***]) [***];

1.17.2

If  the  duration  of  the  Collaboration  Period  is  [***]  but  less  than  [***],  the  Grace

1.17.3
Grace Period shall be [***] ([***]) [***];

If  the  duration  of  the  Collaboration  Period  is  at  least  [***]  but  less  than  [***],  the

[***] ([***]) [***].  

1.17.4

If the duration of the Collaboration Period is [***] or more, the Grace Period shall be

1.18

“Greater China” means the People’s Republic of China, Hong Kong, Macau and Taiwan.

1.19

“IND” means (a) an Investigational New Drug Application as defined in the United States Federal Food, Drug and
Cosmetic Act, as revised, or (b) the equivalent application in any other regulatory jurisdiction outside of the United States of America, the
filing of which is necessary to commence or conduct clinical testing of a pharmaceutical product in humans in such jurisdiction.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

3

 
1.20

1.21

“Jiangsu Ascentage” means Jiangsu Ascentage Pharma Development Ltd. ((cid:0)(cid:0)(cid:0)(cid:0)(cid:0)(cid:0)(cid:0)(cid:0)(cid:0)(cid:0)(cid:0)(cid:0)).

“JRC” or “Joint Research Committee” has the meaning set forth in Section 5.1.

1.22
the terms of this Agreement.

“Library” means, at any point in time, the collection of Compounds then available for screening in accordance with

1.23

“Oncology Indications” means indications where [***].

1.24

“Patents”  means  the  rights  and  interests  in  and  to  issued  patents  and  pending  patent  applications  in  any  country,
including  all  provisional  applications,  substitutions,  continuations,  continuations-in-part,  divisions,  and  renewals,  all  letters  patent  granted
thereon, and all reissues, reexaminations and extensions thereof.

1.25

 “Research Agreement” means that certain research agreement of even date herewith, a copy of which is attached as

Exhibit 1.25.

1.26

“Senolytic Test” means the assay described in Exhibit 1.26, Part A hereto.

1.27

“Technology” means all inventions, discoveries, improvements, trade secrets and proprietary methods and materials,
whether or not patentable, directly relating to one or more Compounds, in each case that is Controlled by Ascentage or its Affiliates during
the term of this Agreement and is necessary or reasonably useful to Unity in exercising its rights or performing its obligations under this
Agreement, including (a) methods of production or use of, Compounds and (b) data, formulations and techniques arising from the synthesis
or characterization of Compounds.

1.28

“Third Party” means any person or entity other than Unity and Ascentage.

1.29

“UM  License  Agreement”  means  that  certain  license  agreement  entered  into  by  Ascentage  and  the  Regents  of  the
University of Michigan (“UM”) effective as of December 1, 2010, as amended by all amendments to such license agreement existing as of
the Effective Date.

1.30
the Section 2.5.

“Unity Active Compounds” means any Compound designated by Unity as an Active Compound in accordance with

1.31

“Unity  Compounds”  means  the  chemical  compounds  discovered  or  synthesized  by  (a)  Ascentage  pursuant  to  the

Research Agreement and/or (b) [***] pursuant to the UM Sponsored Research Agreement (as further defined in Section 2.3.1 below).

ARTICLE 2

COMPOUND SELECTION AND EVALUATION

2.1

Objectives.   The  parties  shall  each  have  a  right  to  screen  the  Library  to  identify  Compounds  of  potential  interest  as

further described in this Article 2.

2.2

Existing Compound Delivery.

4

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
2.2.1

Within  [***]  ([***])  business  days  following  the  Effective  Date,  Ascentage  shall
provide  Unity  with  access  to  the  Compound  Information  described  in  Section  1.9  for  all  Existing  Compounds.    In
addition, together with such Compound Information Ascentage shall provide Unity with the chemical structure of all
Existing  Compounds,  provided  that  Ascentage  shall  not  be  obligated  to  provide  Unity  with  the  structure  of  any
Existing Compounds for which Patents have been not been filed until such time as Patents have been filed with respect
to such Compounds.  Ascentage agrees to provide Unity with periodic updates disclosing to Unity the structures of any
Compounds for which Patents were recently filed.

2.2.2

Upon  Unity’s  request,  Ascentage  shall  supply  to  Unity  at  least  [***]  ([***])  [***]  of
each  of  the  Existing  Compounds  requested  by  Unity,  with  each  such  Compound  to  be  supplied  in  a  formulation  as
described  in  Exhibit  2.2.   Ascentage  shall  use  its  commercially  reasonable  efforts  to  ensure  delivery  of  such  newly
synthesized  Compounds  within  [***]  ([***])  business  days  following  the  date  when  Ascentage  receives  Unity’s
written  request.   At  the  time  of  delivery  of  such  Existing  Compounds,  Ascentage  shall  also  provide  Unity  with  any
Compound  Information  for  such  Compounds  not  previously  supplied  to  Unity  pursuant  to  Section  2.2.1.  Ascentage
shall provide supplemental information regarding the Compounds as reasonably requested by Unity for use in Unity’s
screening  and  evaluation  of  the  Compounds  [***].    Notwithstanding  the  foregoing,  the  parties  acknowledge  that
Ascentage has previously provided Unity with the Prior Compounds and that Ascentage’s supply obligation under this
Section 2.2.2 with respect to such Prior Compounds (other than with respect to Compound Information and chemical
structures for such Prior Compounds not previously supplied to Unity) is deemed satisfied in full as of the Effective
Date.    

2.2.3

To  the  extent  that  Ascentage  does  not  possess  sufficient  quantities  of  one  or  more
Existing  Compounds  to  provide  Unity  with  at  least  [***]  ([***])  [***]  of  the  Existing  Compound(s)  requested  by
Unity under Section 2.2.2, Ascentage agrees to synthesize additional quantities of such Compound(s) for delivery to
Unity  and  Unity  shall  reimburse  Ascentage  for  such  delivered  Compound(s)  at  [***],  which  shall  not  exceed  [***]
Dollars ($[***]) per Compound without Unity’s prior written approval.  Ascentage shall [***] delivery of such newly
synthesized  Compounds  within  [***]  ([***])  business  days  following  the  date  when  Ascentage  receives  Unity’s
written  request.    Notwithstanding  the  foregoing,  in  the  event  that  Ascentage  projects  that  [***]  will  exceed  [***]
Dollars ($[***]) and Unity does not agree to reimburse Ascentage for such additional projected costs, Ascentage shall
not  be  obligated  to  supply  Unity  with  the  requested  quantities  of  such  Compound  but  shall  at  Unity’s  request  [***]
provide Unity or its designee with access and licenses to such Ascentage Intellectual Property as may be reasonably
required to enable Unity or its designee to synthesize such Compound on its own, provided that Unity agrees that the
licenses granted to it under this Section 2.2.3 shall: (a) be limited to the production of the named Compound(s) only,
and (b) be limited to production of quantities of such Compound(s) of [***] or less.  

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

5

 
2.3

Addition of Ascentage Future Compounds and Unity Compounds to the Library.  

2.3.1

UM  Sponsored  Research  Agreement.    Unity  agrees  to  provide  a  total  of  $[***]  in
funding over [***] years following the Effective Date to be used to fund the discovery of additional BCL-2/BCL-xL
inhibitor  compounds  [***].    Promptly  following  the  Effective  Date,  the  parties  shall  agree  upon  and  implement  a
strategy for providing such funding to UM through that certain research agreement entered into by Ascentage and UM
effective  as  of  September  24,  2013  (“UM SRA”),  which  strategy  shall  be  based  on  the  following  principles:  (a)  the
parties shall amend the UM SRA to (i) add a new Project Plan to accommodate such additional funding  and (ii)ensure
that the intellectual property generated by [***] in the performance of such new Project Plan is subject to the option
described in Section 8.2 of the UM SRA, and (b) the parties shall agree upon and update the Research Agreement to
include  a  process  by  which  Ascentage  shall  exercise  the  option  under  Section  8.2  of  the  UM  SRA  with  respect  to
inventions arising under the new Project Plan that Unity would like included within the Ascentage Intellectual Property
for purposes of this Agreement and/or one or more Compound License Agreements.

2.3.2

Notification.  Within [***] ([***]) business days after the end of each [***], Ascentage
will supply to Unity a brief written report disclosing to Unity all Ascentage Future Compounds and Unity Compounds
discovered  by  Ascentage  [***]  during  the  previous  [***]  (“New  Compound  Report”),  such  report  to  include  the
structure of each Compound disclosed therein and any additional information [***] available and known to Ascentage
that  [***]  relates  to  such  Compounds.  Together  with  each  such  New  Compound  Report,  Ascentage  will  supply  to
Unity  at  least  [***]  ([***])  [***]  of  each  of  the  Unity  Compounds  disclosed  in  such  report  in  a  formulation  as
described in Exhibit 2.2 or as otherwise specified in the Research Agreement or UM Sponsored Research Agreement.  

2.3.3

Addition to Library.  

(a)

Ascentage Future Compounds.  

During the Exclusive Evaluation Period, Ascentage shall have the exclusive right
to assess the Ascentage Future Compounds disclosed in such report and to designate one or more of such Ascentage Future
Compounds as Ascentage Active Compounds, with any such designations being made in accordance with the procedures
described in Section 2.6 below.     

(i)

(ii)

Following the end of the Exclusive Evaluation Period, any Ascentage Future
Compounds  disclosed  in  the  applicable  New  Compound  Report  shall  thereafter  be  included  within  the  Library  and  all
such  compounds  that  have  not  been  designated  as  Ascentage  Active  Compounds  shall  thereafter  be  available  for
designation  by  either  Party  as  an  Active  Compound  in  accordance  with  Sections  2.5  and  2.6  (as  applicable).  Upon
addition of such

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

6

 
Ascentage Future Compounds to the Library, Ascentage will promptly supply to Unity at least [***] ([***]) [***] of each
such Ascentage Future Compound for screening and evaluation purposes.  

(b)

  Unity Compounds.  During the Exclusive Evaluation Period following the Unity’s
receipt of a given New Compound Report, Unity shall have the exclusive right to assess the Unity Compounds disclosed in
such  report  and  to  designate  one  or  more  of  such  Unity  Compounds  as  Unity  Active  Compounds,  with  any  such
designations  being  made  in  accordance  with  the  procedures  described  in  Section  2.5  below.      Following  the  end  of  the
Exclusive Evaluation Period, any Unity Compounds disclosed in the applicable New Compound Report shall thereafter be
included  within  the  Library  and  all  such  compounds  that  have  not  been  designated  as  Unity  Active  Compounds  shall
thereafter be available for designation by either Party as an Active Compound in accordance with Sections 2.5 and 2.6 (as
applicable).

2.4

Compound Screening and Analysis.  During the Term, Unity shall have the right to screen and evaluate the Compounds
in  the  Library  to  identify  Compounds  with  senolytic  activity  and  potential  therapeutic  utility  for  the  prophylaxis  and  treatment  of,  and
palliation of symptoms associated with, indications other than Oncology Indications (collectively, “Compound Screening”).    Should  Unity
identify  through  such  Compound  Screening  Compounds  in  the  Library  of  interest  to  Unity  for  which  Patents  have  not  been  filed,  upon
Unity’s  request,  Ascentage  agrees  to  use  commercially  reasonable  efforts  to  promptly  file  Patents  with  respect  such  Compounds  and
thereafter (or to allow Unity to do so at its expense in accordance with Section 7.2) shall disclose to Unity the chemical structure of such
Compounds.  For clarity, Unity expressly agrees that it shall use the Compounds and Compound Information transferred to Unity solely for
the limited purposes of Compound Screening and the evaluation, development and optimization of Compounds in accordance with the terms
of this Agreement and that the Compounds and Compound Information transferred to Unity shall not otherwise be used in conducting any
screening or research aimed at identifying Compounds for use in the prophylaxis or treatment of Oncology Indications.  

2.5

Designation of Active Compounds by Unity. Unity shall have the right to designate Compounds as Active Compounds,

as set forth in this Section 2.5.   

2.5.1

General.  

(a)

Existing  Compounds.    Commencing  on  the  Effective  Date  and  continuing  for  the
duration of Term, Unity shall have the right to designate one or more Existing Compounds as Unity Active Compound, by
providing Ascentage with written notice as described in Section 2.5.2(a) below and subject to the requirements of Section
2.5.2(b)  below.    Notwithstanding  anything  to  the  contrary  in  this  Agreement,  Unity  acknowledges  and  agrees  that  the
[***].    

Ascentage  Future  Compounds.      Commencing  on  expiration  of  the  Exclusive
Evaluation  Period  for  the  applicable  Ascentage  Future  Compound  and  continuing  for  the  duration  of  Term,  Unity  may
designate one or more Ascentage Future Compounds disclosed in such report as a Unity Active Compound by providing

(b)

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

7

 
Ascentage with written notice as described in 2.5.2(a) below and subject to the requirements of Section 2.5.2(b) below.

Unity Compounds.  Commencing on the date of Unity’s receipt of any given New
Compound  Report  and  continuing  for  the  duration  of  Term,  Unity  shall  have  the  right  to  designate  one  or  more  Unity
Compounds as Unity Active Compound, by providing Ascentage with written notice as described in Section 2.5.2(a) below
and subject to the requirements of Section 2.5.2(b) below.

(c)

2.5.2

Designation Process and Requirements.

Notice.  To designate an Existing Compound, an Ascentage Future Compound or a
Unity Compound as a Unity Active Compound, Unity shall so notify Ascentage of such selection in writing and provide
Ascentage  a  description  of  the  applicable  Compound,  including  to  the  extent  the  chemical  structure  of  the  applicable
Compound has been provided to Unity by Ascentage, its chemical structure.

(a)

Ascentage provided that:

(b)

Additional Requirements.  Each such designation shall be effective upon receipt by

validly designated Ascentage Active Compound; and

(i)

The Compound to be designated as a Unity Active Compound is not currently a

bring the total number of Unity Active Compounds to more than fifteen (15).

(ii)

The  designation  of  such  Compound  as  a  Unity  Active  Compound  does  not

2.6

Designation of Active Compounds by Ascentage.   

2.6.1

General.  

(a)

Existing Compounds.   Without  prejudice  to  and  acknowledging  the  designation  of
Ascentage Active Compounds as set forth in Section 2.5.1(a), commencing on the [***] ([***]) [***] anniversary of the
Effective Date and continuing for the duration of Term, Ascentage shall have the right to designate one or more Existing
Compounds  as  Ascentage  Active  Compounds,  by  providing  Unity  with  written  notice  as  described  in  Section  2.6.2(a)
below and subject to the requirements of Section 2.6.2(b) below.

Ascentage Future Compounds.   Commencing on the date of Unity’s receipt of any
given New Compound Report and continuing for the duration of Term, Ascentage may designate one or more Ascentage
Future Compounds disclosed in such report as an Ascentage Active Compound by providing Unity with written notice as
described in 2.6.2(a) below and subject to the requirements of Section 2.6.2(b) below.

(b)

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

8

 
Unity Compounds.  Commencing on expiration of the Exclusive Evaluation Period
for  the  applicable  Unity  Compound,  Ascentage  shall  have  the  right  to  designate  one  or  more  Unity  Compounds  as
Ascentage Active Compound, by providing Unity with written notice as described in Section 2.6.2(a) below and subject to
the requirements of Section 2.6.2(b) below.

(c)

2.6.2

Designation Process and Requirements.

Notice.  To designate an Existing Compound, an Ascentage Future Compound or a
Unity  Compound  as  an  Ascentage  Active  Compound,  Ascentage  shall  so  notify  Unity  of  such  selection  in  writing  and
provide  Unity  a  description  of  the  applicable  Compound,  including  its  chemical  structure  and  a  copy  of  results  of  the
biochemical assay to be described in Exhibit 2.6.

(a)

Unity provided that:

(b)

Additional Requirements.  Each such designation shall be effective upon receipt by

currently a validly designated Unity Active Compound; and

(i)

The  Compound  to  be  designated  as  an  Ascentage  Active  Compound  is  not

not bring the total number of Ascentage Active Compounds to more than fifteen (15).

(ii)

The  designation  of  such  Compound  as  an  Ascentage  Active  Compound  does

2.7

Maximum Number of Active Compounds; Release of Active Compounds.  

may be designated by a Party as Active Compounds at any one time is fifteen (15).

2.7.1

Maximum Number of Active Compounds.  The maximum number of Compounds that

2.7.2

 Release of Active Compounds.  A Party may terminate its designation of any particular
Active Compound at any time by so notifying the other Party in writing (specifying the Active Compound for which
such designation is being terminated).  From and after the date the other Party receives such notice of termination, the
specified Compound shall cease to be an Active Compound for all purposes of this Agreement.

2.8

Technology Transfer.  Within [***] ([***]) days of Unity’s designation of a Compound as a Unity Active Compound,

Ascentage shall provide access to Unity all necessary and [***] Technology [***] available to Ascentage with respect to such Compound.

2.9

Rejection of Compounds; Resupply of Compounds.  

2.9.1

Rejection  of  Compounds  for  Non-Conformance.  Unity  may  reject  the  delivery  of  any
Compounds delivered pursuant to Section 2.2, 2.3.2, or 2.3.3(a)(ii) that fails to materially conform to the requirements
of Exhibit 2.2, by written notice to Ascentage within [***] ([***]) days of delivery of such Compounds, accompanied
by documentation of the non-conformance and any

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

9

 
original experimental data related thereto.  In the event of any nonconformance under this paragraph, Ascentage shall
have [***] ([***])  days  to  cure.    Compounds  that  are  not  rejected  by  Unity  within  [***] ([***])  days  after  delivery
shall be deemed accepted.      

2.9.2

Resupply  of  Compounds.  Unity  shall  have  the  right  to  manufacture  or  have
manufactured  additional  quantities  of  Compounds  already  delivered  pursuant  to  Section  2.2,  2.3.2,  or  2.3.3(a)(ii),
provided that at its election, Unity may obtain additional quantities of such Compounds by written order to Ascentage
specifying the Compounds desired (“Re-supply Compounds”) and provided further that Unity [***].    

DESIGNATION OF DEVELOPMENT CANDIDATES

ARTICLE 3

3.1

General. In the event that either Party elects to advance a Compound into formal preclinical development, such Party
shall first designate such Compound as a Development Candidate in accordance with the procedures set forth in this Article 3. For clarity,
neither  Party  shall  initiate  GLP  toxicity  studies,  nor  carry  out  any  subsequent  preclinical  or  clinical  development,  with  respect  to  any
Compound, unless such Compound has been designated as a Development Candidate, and then only for so long as such Compound retains
such  designation  (or  in  the  case  of  Unity,  only  for  so  long  as  Unity  retains  its  license  to  such  Compound  under  a  Compound  License
Agreement).  

3.2

Requirements for Designation.

Eligibility.  To be eligible for designation as a Development Candidate by a given Party,
a  Compound  must  be  a  validly  designated  Active  Compound  of  such  Party  (all  such  eligible  Compounds,  hereinafter
referred to as “Eligible Compounds”).  

3.2.1

3.2.2

Timing  Requirements.    Commencing  on  the  Effective  Date  and  continuing  for  the
duration  of  Term,  each  Party  shall  have  the  right  to  designate  one  or  more  Eligible  Compounds  as  Development
Candidates,  by  providing  the  other  Party  with  written  notice  as  described  in  Section  3.3.1  below  and  subject  to  the
other requirements of this Section 3.2.

3.2.3

Maximum Number of Development Candidates.  

(a)

Unity.    The  maximum  number  of  Existing  Compounds  and  Ascentage  Future
Compounds that may be designated as Unity Development Candidates at any one time is [***] ([***]), provided that Unity
shall  be  entitled  to  designate  an  additional  [***]  ([***])  Existing  Compounds  and/or  Ascentage  Future  Compounds  as
“Back-up  Compounds”  as  described  in  Section  3.5  below.    For  clarity  there  shall  be  no  limit  on  the  number  of  Unity
Compounds that Unity may designate as Unity Development Candidates.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

10

 
Ascentage.  The maximum number of Unity Compounds that may be designated as
Ascentage Development Candidates at any one time is [***] ([***]).  For clarity there shall be no limit on the number of
Existing  Compounds  and  Ascentage  Future  Compounds  that  Ascentage  may  designate  as  Ascentage  Development
Candidates.

(b)

3.3

Designation of Development Candidates.

Notice.    To  designate  an  Eligible  Compound  as  a  Development  Candidate,  the  Party
making such designation shall notify the other Party of such designation in writing and provide the other Party a clear
description of the applicable Eligible Compound, including its chemical structure.   

3.3.1

3.3.2

Mechanics of Designation.

(a)

Unity.    As  soon  as  practicable  (and  within  [***]  ([***])  days)  after  Unity  's
designation of each Development Candidate in accordance with this Article 3), Unity and Ascentage shall complete and
execute  the  form  of  Compound  License  Agreement  set  forth  in  Exhibit  3.3.2(a).    To  complete  the  form  of  Compound
License Agreement, the Parties shall: (i) fill in the effective date of the Compound License Agreement with the date of the
notice  provided  under  Section  3.3.1  above;  and  (ii)  specify  the  Eligible  Compound  being  designated  as  Development
Candidate.  It is understood that once a notice of designation has been submitted in accordance with Section 3.3.1 above,
then  provided  that  such  designation  is  otherwise  compliant  with  the  requirements  of  this  Article  3,  Ascentage  shall  be
obligated to enter into a Compound License Agreement with respect to the applicable Eligible Compound.  For clarity, the
intent of the Parties is that each Development Candidate shall be the subject of a separate Compound License Agreement
and that each Compound License Agreement shall apply to only a single Development Candidate.

Ascentage.    Notices    of  designation  submitted  by  Ascentage  in  accordance  with
Section 3.3.1 above shall be effective upon receipt by Unity, provided that such designation is otherwise compliant with the
requirements of this Article 3.  

(b)

3.3.3

Termination  of  Development  Candidate  Status.  A  Party  may  terminate  its  designation  of
any particular Development Candidate at any time by so notifying the other Party in writing (specifying the Development
Candidate for which such designation is being terminated), such notice in the case of a termination by Unity to take the
form of a notice of termination under the Compound License Agreement for such Development Candidate.  From and after
the  date  the  other  Party  receives  such  notice  of  termination,  the  specified  Compound  shall  cease  to  be  an  Development
Candidate for all purposes of this Agreement and shall be returned to the Library where it shall be available for selection as
an  Active  Compound  pursuant  to  Sections  2.5  and  2.6  (as  applicable),  provided  that  such  terminated  Development
Candidate shall not be available for re-selection by the terminating Party as either an Active Compound or a Development
Candidate for a period of [***]

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

11

 
([***]) [***] following the date notice of termination was provided to the non-terminating Party pursuant to this Section
3.3.3.  

3.4

Diligence Requirements.  

3.4.1

Unity.  With respect to each Compound designated as a Development Candidate, Unity
shall  meet  the  diligence  requirements  set  forth  in  the  Compound  License  Agreement  for  such  Development
Candidate.    In  the  event  that  Unity  fails  to  meet  such  diligence  requirements  and  fails  to  cure  such  default  in
accordance  with  the  terms  of  such  Compound  License  Agreement,  Unity’s  right  to  continue  to  develop  such
Development Candidate will terminate, all as further described in such Compound License Agreement.

3.4.2

Ascentage.  With respect to each Compound designated as a Development Compound,
Ascentage shall meet the diligence requirements set forth in Exhibit  3.4.2.  In the event that Ascentage fails to meet
such diligence requirements and fails to cure such default accordance with Section 12.2, Ascentage’s right to continue
to  develop  such  Development  Candidate  will  terminate,  Ascentage  shall  [***]  discontinue  ([***])  all  development
activities with respect to such Development Candidate.

3.5

Back-up Compounds.  

3.5.1

Designation.  At the time Unity designates a Development Candidate, Unity shall have
the right to designate [***] Active Compound to be used to replace such Development Candidate in the event Unity
elects to abandon development of such Development Candidate (each, a “Back-up Compound”), all as further specified
in the applicable Compound License Agreements.

3.5.2

Exclusivity.   Ascentage  shall  be  free  to  conduct  research  with  respect  to  the  Back-up
Compounds, provided that Ascentage hereby covenants that it shall not [***], nor shall it authorize any Third Party
(including its Affiliates) to [***] with respect to any Back-up Compound until such time as such Back-up Compound is
released in accordance with Section 3.5.3.  For clarity, once a Back-up Compound has been released, such Compound
shall be available for development and commercialization by Ascentage in accordance with the applicable terms of this
Agreement.

3.5.3

Release of Back-up Compounds.  A Back-up Compound shall be deemed to be released
upon the first to occur of either of the following events: (a) the termination of the Compound License Agreement for
the  Development  Compound  with  which  such  Back-up  Compound  is  associated,  or  (b)  the  [***]  anniversary  of  the
[***]  of  the  Development  Compound  with  which  such  Back-up  Compound  is  associated.    For  clarity,  it  is
acknowledged that a condition of Unity’s maintaining its license with respect to any given Development Compound is
that Unity meet the diligence requirements set forth in the Compound

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

12

 
License Agreement for such Development Candidate.  It is further acknowledged that in the event that Unity fails to
meet  such  diligence  requirements  and  fails  to  cure  such  default  in  accordance  with  the  terms  of  such  Compound
License Agreement, Unity’s right to continue to develop such Development Candidate will terminate, and any Back-up
Compound associated with such Development Compound shall be released, all as further described in such Compound
License Agreement.  

EXCLUSIVITY/RESTRICTIONS ON COMPOUND DEVELOPMENT

ARTICLE 4

4.1

Unity.

4.1.1

No [***] of Ascentage Development Candidates.  Unity hereby covenants that it shall
not conduct, nor shall it authorize any Third Party (including its Affiliates) to conduct, any [***] with respect to any
Compound that Ascentage has designated as a Development Candidate in accordance with the terms of Article 3 for so
long as that Compound remains designated as an Ascentage Development Candidate (and in the case that [***]).

4.1.2

No  Initiation  of  GLP  Toxicology  Studies  without  designation  as  a  Development
Candidate.    Unity  hereby  covenants  that  it  shall  not  initiate,  nor  shall  it  authorize  any  Third  Party  (including  its
Affiliates) to initiate, GLP toxicology studies (or any subsequent studies) with respect to any Compound which it has
not designated as a Development Candidate in accordance with Article 3.

No  Development  for  Oncology  Indications.    Unity  hereby  covenants  that  it  shall  not
research  or  develop,  nor  shall  it  authorize  any  Third  Party  (including  its  Affiliates)  to  research  or  develop,  any
Compound for the diagnosis, prophylaxis, treatment or palliation of any Oncology Indications.

4.1.3

4.2

Ascentage.

4.2.1

No  Initiation  of  GLP  Toxicology  Studies  without  designation  as  a  Development
Candidate.  Ascentage hereby covenants that it shall not initiate, nor shall it authorize any Third Party (including its
Affiliates) to initiate, GLP toxicology studies (or any subsequent studies) with respect to any Compound which it has
not designated as a Development Candidate in accordance with Article 3.  

Unity Compounds. Ascentage hereby covenants that it shall not research or develop, nor
shall  it  authorize  any  Third  Party  (including  its  Affiliates)  to  research  or  develop,  any  Unity  Compound  for  the
diagnosis, prophylaxis, treatment or palliation of any indications that are not Oncology

4.2.2

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

13

 
Indications.  The foregoing restriction will survive the termination or expiration of this Agreement for any reason.

4.2.3

Existing Compounds and Future Ascentage Compounds.  

Restrictions on Development for Indications Being Developed by Unity.  Ascentage
hereby covenants that it shall not develop or commercialize, nor shall it authorize any Third Party (including its Affiliates)
to  develop  or  commercialize,  any  Existing  Compound  or  Future  Ascentage  Compound  for  the  diagnosis,  prophylaxis,
treatment or palliation of any indication which:

(a)

[***]:  (A)  [***],  or  (B)  [***]  with  respect  to  an  [***]  in  compliance  with
[***].    The  foregoing  restriction  will  survive  on  an  indication-by-indication  basis  for  so  long  as  [***]  or  [***].    [***]
agrees to [***] all indications which [***].  Additionally, [***] agrees to [***].      

(i)

(ii)

is one of up to [***] ([***]) indications [***] as being an indication with respect
to  which  [***]  within  [***]  ([***])  [***]  of  [***]  (each,  an  “[***]”).    Upon  [***],  [***]  will  [***].    The  exclusivity
granted to Unity with respect to such [***] will [***], such that (A) following the [***], if an [***] with respect to [***],
then [***], (B) following the [***], if an [***] with respect to [***], then [***], and [***] until the [***], at which point
this Section 4.2.3(a)(ii) shall be of no further force and effect.

[***], or (B) either [***] or [***].

(iii)

As used herein, an “[***]” with respect to a given indication, means that either: (A)

For clarity, it is understood that (A) Unity’s rights to develop Compounds are limited
to the development of Compounds for indications other than Oncology Indications, and (B) this Section 4.2.3(a) shall in no
way  restrict  Ascentage’s  right  to  develop  and  commercialize  Existing  Compounds  or  Future  Ascentage  Compounds  for
Oncology Indications.

(iv)

General Restrictions on Development outside of Oncology Indications.  Within the
Grace  Period,  Ascentage  hereby  covenants  that  it  shall  not  research  or  develop  any  Existing  Compounds  or  Future
Ascentage  Compounds  for  the  diagnosis,  prophylaxis,  treatment  or  palliation  of  any  indication  that  is  not  an  Oncology
Indication unless such Existing Compound or Future Ascentage Compound [***].

(b)

Restrictions on Development of Carved Out Indications.   Without  limiting  Section
4.2.3(a) and (b) above, Ascentage further covenants that it will not develop nor shall it authorize any Third Party (including
its Affiliates) to develop, any Compound for a Carved Out Indication except as permitted under this Section 4.2.3(c).

(c)

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

14

 
(i)

  No  more  than  [***]  in  any  rolling  [***]  ([***])  [***]  period,  Ascentage  may
request permission to develop [***] (“Subject Compound”)  for prophylaxis or  treatment  of  one  or  more  Carved  Out
Indications (“Subject Indications”).  Such request shall be submitted in writing and shall include a description of the
Compound  (including  its  structure),  a  [***]  below,  and  a  description  of  the  Carved  Out  Indication(s)  proposes  to
pursue.  

request, so long as:    

(ii)

Unity  shall  not  withhold  its  consent  with  respect  to  such  validly  submitted

(A)

(B)

(C)

[***];

[***];

[***].

Upon  approval  by  Unity  of  such  request  (which  approval  shall  be  provided  in
writing),  Ascentage  shall  be  free  to  pursue  the  development  of  the  Subject  Compound  for  the  Subject  Indication(s)
provided that:    

(iii)

(A)

(B)

The [***] may be developed shall be limited to [***];  

Unity  shall  have  a  right  of  first  refusal  with  respect  to  development  and

commercialization of such Subject Compound as further described in Article 8 below.

The Parties will negotiate and agree upon [***] for use under Section 4.2.3(c)(ii)
(B) within [***] immediately after the Effective Date of this Agreement (“[***]”).  Ascentage will appoint [***] and
Unity will appoint [***] to negotiate such agreements on their respective behalf.  Once agreed upon, the [***] shall be
appended hereto as [***].

(iv)

ARTICLE 5
MANAGEMENT

5.1

Joint  Research  Committee.    Ascentage  and  Unity  will  establish  a  committee  (the  “Joint  Research  Committee”  or

“JRC”) to coordinate the parties activities under this Agreement.  The responsibilities of the Joint Research Committee shall consist of:

5.1.1

5.1.2

Compounds;

Facilitating the exchange of materials and information between the parties;

Monitoring and reporting of the discovery of Ascentage Future Compounds and Unity

5.1.3

Reviewing and discussing issues that may arise involving the designation or release of

Active Compounds;

15

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
5.1.4

5.1.5

Initial, informal mediation of any other dispute that arises under this Agreement; and

Such other responsibilities as both parties may mutually agree to delegate to the JRC.

5.2

Membership.    The  JRC  shall  include  two  (2)  representatives  of  each  of  Ascentage  and  Unity,  with  each  party’s
members selected by that party.  Ascentage and Unity may each replace its JRC representatives at any time, upon written notice to the other
party.

5.3

Meetings.    The  JRC  shall  meet  at  least  [***],  or  more  frequently  as  agreed  by  the  parties,  at  such  locations  as  the
parties agree, and will otherwise communicate regularly.  With the consent of the parties, other representatives of Ascentage or Unity may
attend JRC meetings as nonvoting observers.  Each party shall be responsible for all of its own expenses associated with attendance of such
meetings.

5.4

Decision Making.  With respect to decisions taken on matters placed by either party before the JRC, each party shall
have  one  vote.    Decisions  of  the  JRC  shall  be  made  by  unanimous  approval  of  the  parties.    If  the  members  of  the  JRC  cannot  reach  an
agreement after commercially reasonable efforts to do so, then either party’s representative to the JRC may refer such dispute to the [***] of
each party, who shall meet in person or by telephone within [***] ([***]) days after such referral to attempt in good faith to resolve such
dispute.

ARTICLE 6

PAYMENTS

6.1

Upfront Fee.  As partial consideration for the rights and licenses granted to Unity under this Agreement, Unity shall
issue to Ascentage, subject to Ascentage’s execution and delivery to Unity of a Stock Issuance Agreement in substantially the form attached
hereto as Exhibit 6.1 – part A (such form of agreement, the “Stock Agreement”),  Three  Hundred  Ninety  Three  Thousand  Three  Hundred
Thirty Five (393,335) shares of Unity common stock; such shares to be issued to Ascentage within [***] ([***]) days of the Effective Date.
A capitalization table for Unity true and complete as of the Effective Date, is attached hereto as Exhibit 6.1 – part B.

6.2

First  Locally-Dosed  Licensed  Compounds.    Upon  Unity’s  designation  of  each  of  the  first  two  (2)  locally-dosed
Development  Candidates,  Unity  shall  issue  to  Ascentage  Three  Hundred  Ninety  Three  Thousand  Three  Hundred  Thirty  Five  (393,335)
shares of Unity common stock, for each locally dosed Development Candidate; such shares to be issued to Ascentage pursuant to the Stock
Agreement within [***] ([***]) days of date a Compound License Agreement is executed with respect to such Development Candidate.

6.3

Equity Cap.   Notwithstanding anything in the contrary in this Agreement, any Compound License Agreement or the
APG-1252 License Agreement, the maximum cumulative aggregate number of shares of Unity common stock that Ascentage is eligible to
receive under Sections 6.1 and 6.2 of this Agreement, Section 5.1 of all Compound License Agreements and Section 5.1 of the APG-1252
License Agreement is:  

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

16

 
(a)

(b)

[***] ([***]) shares of Unity common stock if only one Licensed Product is developed; and

Three Million Nine Hundred Thirty Three Thousand Three Hundred and Fifty (3,933,350) shares

of Unity common stock if two or more Licensed Products is developed.

6.4

Purchase of Ascentage Shares.

6.4.1

Disclosure  of  Series  B  Documentation.    Promptly  following  the  Effective  Date,
Ascentage shall provide to Unity true and correct copies of all of the relevant documents related to Jiangsu Ascentage’s
most  recent  financing,  including  without  limitation,  the  investment  agreement,  any  stockholders  agreement,  and  the
charter documents (collectively the “Series B Documentation”)

6.4.2

First Tranche of Preferred Stock.  Within [***] ([***]) days of the later of the Effective
Date and Unity’s receipt of the Series B Documentation, Unity shall purchase $[***] of Jiangsu Ascentage’s equity, at
the same price and on the same terms as those applicable to the investors that participated in Jiangsu Ascentage’s most
recent financing.  

6.4.3

Second  Tranche  of  Preferred  Stock.    Within  [***]  ([***])  days  of  the  later  of  the
Effective  Date  and  Unity’s  receipt  of  the  Series  B  Documentation,  Unity  shall  purchase  an  additional  $[***]  of
Ascentage’s preferred stock at a valuation equal to the greater of (a) $[***] on terms that are otherwise pari passu  to
the  terms  of  the  most  recent  financing,  and  (b)  the  most  recent  preferred  stock  valuation  if  Jiangsu  Ascentage
consummates  a  stock  financing  after  the  Effective  Date,  in  which  case  Unity  shall  purchase  such  shares  at  the  same
price and on the same terms as those applicable to the investors that participated in such financing.  

6.5

Board  Observer.    After  the  purchase  $[***]  of  Jiangsu  Ascentage’s  equity  by  Unity,  Ascentage  shall  invite  a
representative  of  [***],  initially  [***],  to  attend  in  all  meetings  of  its  board  of  directors  (including  committees  thereof)  in  a  non-voting
observer  capacity  and,  in  this  respect,  shall  give  such  representative  copies  of  all  notices,  minutes,  consents,  and  other  materials  that  it
provides to its directors; provided, however, that Ascentage reserves the right to withhold any information and to exclude such representative
from any meeting or portion thereof if (a) access to such information or attendance at such meeting could adversely affect the attorney-client
privilege between Ascentage and its counsel; or (b) access to such information or attendance at such meeting could result in disclosure of
trade secrets to Unity.

6.6

Unity’s  Covenants.    Unity  hereby  agrees  that  any  shares  of  common  stock  issued  to  Ascentage  will  not  be  diluted
unless diluted in good faith by Unity on a proportionate basis to other shares of common stock of Unity outstanding at the time of any such
dilution, and subject to the anti-dilution protections as set forth in Unity’s certificate of incorporation, as may be amended from time to time
in good faith; provided further, that Unity shall not take actions that specifically

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

17

 
treat Ascentage differently from other holders of common stock, or issue any capital stock in a manner which is intended to circumvent this
covenant.    The  shares  of  common  stock  issued  to  Ascentage  shall  be  duly  adjusted  for  any  bonus  issue,  share  split,  consolidation,
subdivision, reclassification, recapitalization or similar arrangement of Unity, in each case in accordance with, and as expressly contemplated
by, Unity’s certificate of incorporation, as may be amended from time to time in good faith.

7.1

License Grants to Unity.

ARTICLE 7

INTELLECTUAL PROPERTY

License  to  Conduct  Compound  Screening.  Subject  to  the  terms  and  conditions  of  this
Agreement, Ascentage hereby grants to Unity an non-exclusive license under the Ascentage Intellectual Property solely
to carry out Compound Screening of the Compounds in the Library;

7.1.1

7.1.2

License  to  Develop  Unity  Active  Compounds.  Subject  to  the  terms  and  conditions  of
this  Agreement,  Ascentage  hereby  grants  to  Unity  a  license  co-exclusive  with  Ascentage  under  the  Ascentage
Intellectual Property to develop Active Compounds for the prophylaxis and treatment of, and palliation of symptoms
associated with, indications that are not Oncology Indications..

7.1.3

License  to  Manufacture  Compounds.    Subject  to  the  terms  and  conditions  of  this
Agreement,  Ascentage  hereby  grants  to  Unity  an  non-exclusive  license  under  the  Ascentage  Intellectual  Property  to
manufacture or have manufactured additional quantities of Compounds previously delivered pursuant to Section 2.2,
2.3.2, or 2.3.3(a)(ii) solely for use in accordance with Sections 7.1.1 and 7.1.2. above.

7.2

Prosecution of Compound-Related Patents.  Subject to Unity’s rights under any Compound License Agreements then in
effect, Ascentage shall have the first right, but shall not be obligated under this Agreement, to prosecute and maintain Compound-Related
Patents  as  it  deems  commercially  reasonable  and  necessary.   Ascentage  shall  bear  all  patent  costs  that  it  incurs  in  relation  to  the  filing,
prosecution  and  maintenance  of  the  Compound-Related  Patents  under  this  Agreement.    Unity  shall  have  the  right,  at  its  own  cost  and
expense,  to  reasonably  assist  Ascentage  in  connection  with  the  filing,  prosecution  and  maintenance  of  any  Compound-Related  Patent
covering any Compound [***]. If Ascentage, prior or subsequent to filing any Compound-Related Patent anywhere in the world, elects not to
file, prosecute or maintain such Patent or claims encompassed by such Patent in any country of the world, as the case may be, Ascentage
shall give Unity notice thereof within [***] prior to allowing such Patent or such claims encompassed by such Patent to lapse or become
abandoned or unenforceable, and Unity shall thereafter have the right, at its sole expense and [***], to prepare, file, prosecute and maintain
such Patent or claims encompassed by such Patent in such country.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

18

 
7.3

Interferences, Oppositions, Enforcement.   As between the parties  and  subject  to  Unity’s  rights  under  any  Compound
License Agreements then in effect, Ascentage shall have the sole right (but not the obligation), at its expense, to conduct any interferences,
oppositions,  or  reexaminations  with  respect  to  any  Patents  within  the  Ascentage  Intellectual  Property  (including  without  limitation,  the
Compound-Related  Patents),  to  request  any  reissues  or  patent  term  extensions  thereof,  and  to  initiate  and  prosecute  enforcement  actions
against Third Parties infringing such Patents.

7.4

No Other Rights.  No rights other than those expressly set forth in this Agreement are granted to either party hereunder,

and no additional rights shall be deemed granted to either party by implication, estoppel or otherwise.

RIGHT OF NOTICE AND OFFER FOR ASCENTAGE PRODUCTS FOR CARVED OUT INDICATIONS

ARTICLE 8

8.1

Ascentage  Notice.    In  the  event  that  Ascentage  wishes  to  pursue  development  and  commercialization  of  Subject
Compound  for  use  in  treating  one  or  more  Subject  Indications,  Ascentage  shall  deliver  written  notice  to  Unity  of  Ascentage’s  interest  in
pursuing  the  development  of  such  Subject  Compound  together  with  a  description  of  the  Subject  Indications  it  is  proposing  to  pursue  in
reasonable detail to permit Unity to evaluate its interest in such opportunity.  

8.2

Unity  Notice.    Within  [***]  ([***])  calendar  days  of  Unity’s  receipt  of  such  notice  and  description  of  the  Subject
Compound and Subject Indication(s), Unity will provide Ascentage with written notice either that (i) Unity is not interested in developing
such Subject Compound for one or more of the Subject Indications, or (ii) Unity is interested in developing such Subject Compound for one
or more of the Subject Indications.  If Unity fails to deliver any notice within such [***] ([***])-day period, Unity will be deemed to have
provided  notice  that  it  is  not  interested  in  developing  such  Subject  Compound  for  one  or  more  of  the  Subject  Indications,  in  which  case
Ascentage  will  be  free  to  develop  and  commercialize  such  Subject  Compound  for  such  Subject  Indication(s)  provided  that  such  Subject
Compound and Subject Indications are otherwise compliant with the requirements of Section 4.2.3.

8.3

Entry  into  New  Compound  License  Agreement.    If  Unity  provides  Ascentage  with  timely  notice  under  Section  8.2
above  that  it  is  interested  in  developing  such  Subject  Compound  for  one  or  more  of  the  Subject  Indications,  Unity  and  Ascentage  shall
promptly  complete  and  execute  the  form  of  Compound  License  Agreement  set  forth  in  Exhibit  3.3.2(a).    It  is  understood  that  Unity’s
continuing rights to such Subject Compound shall be dependent upon Unity achieving the applicable diligence milestones set forth therein,
all as further specified in such Compound License Agreement.

8.4

Negotiation of Form JV Agreement.  The Parties agree that they will negotiate and agree to form agreements relating to
joint venture to be established for the purpose of commercializing the Licensed Products in the Greater China within [***] immediately after
the  Effective  Date  of  this  Agreement.   Ascentage  will  appoint  [***]  and  Unity  will  appoint  [***]  to  negotiate  such  agreements  on  their
respective behalf.  Neither Party may develop, manufacture, distribute, sell or otherwise commercialize the Licensed Products in the Greater
China other than

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

19

 
through the joint venture formed pursuant to this Agreement and the Compound License Agreement.

ARTICLE 9

CONFIDENTIALITY

9.1

Confidential  Information.    Except  as  otherwise  expressly  provided  herein,  the  parties  agree  that  the  receiving  party
shall not, except as expressly provided in this Article 9, disclose to any Third Party or use for any purpose any proprietary information which
is disclosed to it (whether orally or in writing) and identified as confidential (“Confidential Information”), except to the extent that it can be
established by the receiving party by competent proof that such information:

(a)
confidentiality, at the time of disclosure;

Was  already  known  to  the  receiving  party,  other  than  under  an  obligation  of

its disclosure to the receiving party;

(b)

Was generally available to the public or otherwise part of the public domain at the time of

disclosure and other than through any act or omission of the receiving party in breach of this Agreement;

(c)

Became generally available to the public or otherwise part of the public domain after its

Was  independently  developed  by  the  receiving  party  without  reference  to  information
provided  by  the  disclosing  party  as  demonstrated  by  documented  evidence  prepared  contemporaneously  with  such
independent development; or

(d)

Third Party who had no obligation to the disclosing party not to disclose such information to others.

(e)

Was disclosed to the receiving party, other than under an obligation of confidentiality, by a

9.2

Permitted Use and Disclosures.  Each party hereto may use or disclose Confidential Information disclosed to it by the
other party to the extent such use or disclosure (a) is reasonably necessary in the exercise of the rights granted to it hereunder or in carrying
out its obligations hereunder, or (b) in prosecuting or defending litigation and complying with applicable governmental laws, regulations or
court order, provided that if a party is required by law to make any such disclosure, other than pursuant to a confidentiality agreement, it will
give reasonable advance notice to the other party of such disclosure and, save to the extent inappropriate in the case of patent applications or
the like, will use its reasonable efforts to secure confidential treatment of such information in consultation with the other party prior to its
disclosure (whether through protective orders or otherwise) and disclose only the minimum necessary to comply with such requirements.

9.3

Nondisclosure of Terms.    Each  of  the  parties  hereto  agrees  not  to  disclose  the  terms  of  this  Agreement  to  any  Third
Party without the prior written consent of the other party hereto, which consent shall not be unreasonably withheld, except to such party’s
attorneys, advisors,

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

20

 
investors and others on a need to know basis under circumstances that reasonably ensure the confidentiality thereof, or to the extent required
by law.

9.4

Public Announcement.  Unity may, in its discretion, issue a press release announcing the formation of this Agreement,
which  shall  be  substantially  in  a  form  approved  by  Ascentage  prior  to  execution  of  the  Agreement.    Except  with  respect  to  such  initial
release,  neither  party  shall  issue  an  additional  press  release  or  public  announcement  relating  to  this  Agreement  without  the  prior  written
approval  of  the  other  party,  which  shall  not  be  withheld  unreasonably.    Either  party  may  refer  to  the  research  collaboration  under  this
Agreement  in  promotional  and  other  communications  with  prospective  customers  and  investors,  provided  that  such  disclosure  shall  not
include any technical details or any financial terms of the collaboration.

ARTICLE 10

REPRESENTATIONS AND WARRANTIES

10.1

Warranty.  Each party represents and warrants on its own behalf and on behalf of its Affiliates that:  (a) it has the legal
power  and  authority  to  enter  into  this  Agreement  and  to  perform  all  of  its  obligations  hereunder;  (b)  this  Agreement  is  a  legal  and  valid
obligation binding upon it and enforceable in accordance with its terms; and (c) it has not previously granted, and during the term of this
Agreement will not make any commitment or grant, any rights which are in conflict in any material way with the rights and licenses granted
herein.  

10.2

Additional Ascentage Warranties.  Ascentage represents and warrants on its own behalf and on behalf of its Affiliates

that as of the Effective Date:  

there  are  no  actual  or  pending  actions,  suits  or  claims,  by  any  third  party  (a)
challenging  the  ownership  of  the  Existing  Compounds;  (b)  challenging  the  validity,  effectiveness,  enforceability,  or
ownership of Ascentage Intellectual Property.

10.2.1

The  Patents  within  the  Ascentage  Intellectual  Property  are  subsisting,  in  force  or
pending,  as  the  case  may  be,  and  are  not  the  subject  of  any  interference,  reissue,  reexamination,  opposition,
cancellation or similar administrative proceedings.

10.2.2

Ascentage has not brought a claim alleging an infringement by a Third Party of any of
the  Patents  within  the  Ascentage  Intellectual  Property  and  to  Ascentage’s  actual  knowledge,  there  is  no  actual  or
alleged infringement by a Third Party of any of the Patents within the Ascentage Intellectual Property.

10.2.3

10.2.4

there are no Patents: (a) filed by Ascentage and subsequently assigned to Third Party,
or  (b)  with  respect  to  which  Ascentage  or  its  Affiliates  have  acquired  rights  from  a  Third  Party  (i.e.,  through  in-
licenses,  cross-licenses  or  otherwise),  in  each  case  that  (i)  would  be  required  for  Unity  to  research,  develop,
manufacture, use or commercialize the Existing Compounds and (ii) are not included within the Ascentage Intellectual
Property.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

21

 
10.2.5

there are no actual or pending actions, suits or claims, by any Third Party asserting that
the  manufacture,  use,  sale,  offer  for  sale  or  importing  of  a  Compound  infringes  the  intellectual  property  of  a  Third
Party and to Ascentage’s knowledge, the development and commercialization of the Compounds would not infringe (a)
any issued Patents of any Third Party (other than Patents in-licensed from UM), or (b) any published Patent claim of
any Third Party (other than claims of Patents in-licensed from UM) if such claim were to issue as published.

Ascentage has disclosed to Unity all material agreements with Third Parties in effect as
of  the  Effective  Date  pursuant  to  which  Ascentage  Intellectual  Property  relating  to  BCL-2/BCL-xL  inhibitors  was
licensed, acquired or sold.

10.2.6

agreement) disclosed to Unity by Ascentage is a true, accurate, and complete copy of the UM License Agreement.

10.2.7

The  copy  of  UM  License  Agreement  (including  the  first  amendment  to  such  license

10.3

Certain Rights and Obligations under the UM License Agreement.

the extent the same would materially and adversely affect Unity’s rights under this Agreement.

10.3.1

Ascentage  shall  not  modify,  amend  or  otherwise  alter  the  UM  License  Agreement  to

10.3.2

Ascentage  shall  not  (a)  exercise  or  fail  to  exercise  any  right  under  the  UM  License
Agreement or (b) provide or fail to provide any consent or approval with respect to any right or obligation under the
UM License Agreement, in each case to the extent the same would materially and adversely affect Unity’s rights under
this Agreement.

10.3.3

Ascentage shall not unilaterally terminate the UM License Agreement.

10.4

Disclaimer.    ASCENTAGE  AND  UNITY  SPECIFICALLY  DISCLAIM  ANY  GUARANTEE  THAT  THE
RESEARCH UNDERTAKEN HEREUNDER WILL BE SUCCESSFUL, IN WHOLE OR IN PART.  THE FAILURE OF THE PARTIES
TO  SUCCESSFULLY  DEVELOP  ACTIVE  COMPOUNDS  OR  PRODUCTS  WILL  NOT  CONSTITUTE  A  BREACH  OF  ANY
REPRESENTATION  OR  WARRANTY  OR  OTHER  OBLIGATION  UNDER  THIS  AGREEMENT.    EXCEPT  AS  OTHERWISE
EXPRESSLY SET FORTH IN THIS AGREEMENT, UNITY AND ASCENTAGE MAKE NO REPRESENTATIONS AND EXTEND NO
WARRANTIES  OR  CONDITIONS  OF  ANY  KIND,  EITHER  EXPRESS  OR  IMPLIED,  WITH  RESPECT  TO  THE  ASCENTAGE
INTELLECTUAL PROPERTY, COMPOUNDS, OR INFORMATION DISCLOSED HEREUNDER, INCLUDING, BUT NOT LIMITED
TO,  WARRANTIES  OF  MERCHANTABILITY,  FITNESS  FOR  A  PARTICULAR  PURPOSE,  VALIDITY  OF  ANY  TECHNOLOGY,
PATENTED OR UNPATENTED, OR NONINFRINGEMENT OF THE INTELLECTUAL PROPERTY RIGHTS OF THIRD PARTIES.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

22

 
ARTICLE 11
INDEMNIFICATION

11.1

Ascentage.    Ascentage  agrees  to  indemnify  and  defend  Unity  and  their  respective  directors,  officers,  employees,
agents and their respective successors, heirs and assigns (the “Unity Indemnitees”) against any losses, costs, claims, damages, liabilities or
expense (including reasonable attorneys’ and professional fees and other expenses of litigation) (collectively, “Liabilities”) arising, directly
or indirectly out of or in connection with Third Party claims, suits, actions, demands or judgments, to the extent (i) relating to any products
based on the Compounds developed, manufactured, used, sold or otherwise distributed by or on behalf of Ascentage, its Affiliates, licensees
or other designees including, without limitation, product liability and patent infringement claims, or (ii) resulting from a breach by Ascentage
of  its  representations  and  warranties  under  this  Agreement,  except,  in  each  case,  to  the  extent  such  Liabilities  result  from  the  gross
negligence or intentional misconduct of Unity.  

11.2

Unity.  Unity agrees to indemnify and defend Ascentage and their respective directors, officers, employees, agents and
their respective heirs and assigns (the “Ascentage Indemnitees”) against any Liabilities arising, directly or indirectly out of or in connection
with  Third  Party  claims,  suits,  actions,  demands  or  judgments,  to  the  extent  resulting  from  a  breach  by  Unity  of  its  representations  and
warranties  under  this  Agreement,  except,  in  each  case,  to  the  extent  such  Liabilities  result  from  the  gross  negligence  or  intentional
misconduct of Ascentage.  

11.3

Procedure.  In the event that any Indemnitee intends to claim indemnification under this Article 11 it shall promptly
notify the other party in writing of such alleged Liability.  The indemnifying party shall have the right to control the defense thereof with
counsel of its choice as long as such counsel is reasonably acceptable to Indemnitee; provided, however, that any Indemnitee shall have the
right to retain its own counsel at its own expense, for any reason, including if representation of any Indemnitee by the counsel retained by the
indemnifying  party  would  be  inappropriate  due  to  actual  or  potential  differing  interests  between  such  Indemnitee  and  any  other  party
reasonably represented by such counsel in such proceeding.  The affected Indemnitee shall cooperate with the indemnifying party and its
legal representatives in the investigation of any action, claim or liability covered by this Article 11.  The Indemnitee shall not compromise or
settle any claim or suit, or voluntarily incur any expense with respect to any such claim or suit, in each case, without the prior written consent
of the indemnifying party, which such party shall not be required to give.

ARTICLE 12

TERM AND TERMINATION

12.1

Term.    This  Agreement  shall  commence  on  the  Effective  Date  and  shall  continue  in  full  force  and  effect  until  the

expiration of the applicable Grace Period (“Term”), unless terminated earlier as provided in this ARTICLE 12.

12.2

Termination for Breach.  In the event of a material breach of this Agreement, the nonbreaching party shall be entitled
to terminate this Agreement by written notice to the breaching party, if such breach is not cured within sixty (60) days after written notice is
given by the nonbreaching party to the breaching party specifying the breach.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

23

 
12.3

Effects of Termination.

12.3.1

Accrued Rights and Obligations.  Termination of this Agreement for any reason shall
not release either party hereto from any liability which, at the time of such termination, has already accrued to the other
party or which is attributable to a period prior to such termination nor preclude either party from pursuing any rights
and remedies it may have hereunder or at law or in equity with respect to any breach of this Agreement.

Return  of  Compound.    Upon  expiration  or  termination  of  this  Agreement  for  any
reason,  Unity  shall  return  to  Ascentage  all  unused  quantities  of  the  Compounds,  or  destroy  such  quantities  at  the
written request of Ascentage.

12.3.2

12.3.3

Survival.  Articles 1 (Definitions), 8 (Right of Notice and Offer for Ascentage Products
for Carved-Out Indications), 9 (Confidentiality), 10 (Representations and Warranties), 11 (Indemnification) 13 (Dispute
Resolution) and 14 (Miscellaneous) and Sections 3.5, 4.2.3(a)(i) and (ii) (but only for the durations specified therein),
4.2.3(c), 6.4 and 12.3 shall survive the expiration or termination of this Agreement for any reason, provided that in the
case  of  Sections  3.5,  4.2.3(a)(i),  4.2.3(a)(ii)  and  4.2.3(c),  survival  of  these  sections  shall  be  contingent  upon  Unity
having  fulfilled  its  obligations  under  Section  6.1.    Except  as  otherwise  provided  in  this  Article  12,  all  rights  and
obligations of the parties under this Agreement shall terminate upon the expiration or termination of this Agreement.

12.4

Condition Precedent.  

12.4.1

This Agreement is entered into subject to the condition precedent that Ascentage and
UM  agree  upon  and  execute  an  amendment  to  the  UM  License  Agreement  (“Second  Amendment”)  adjusting  the
royalties  owing  to  UM  in  connection  with  the  activities  contemplated  by  this  Agreement  (including  the  attached
Exhibits).  All rights and obligations set forth in the Agreement shall only become effective upon the Effective Date.  

the Second Amendment as soon as reasonably practicable.

12.4.2

Ascentage hereby agrees to use its commercially best efforts to complete and execute

13.1

Dispute Resolution.

DISPUTE RESOLUTION

Consultation.    If  an  unresolved  dispute  (other  than  a  dispute  among  members  of  the
JRC regarding a decision of the JRC) arises out of or relates to this Agreement, or the breach thereof, either party may
refer such dispute to the [***] of each party, who shall meet in person or by telephone within

13.1.1

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

24

 
 
[***] ([***]) days after such referral to attempt in good faith to resolve such dispute.  If such matter cannot be resolved
by  discussion  of  the  respective  [***]s  within  such  [***]  ([***])  days  period  (as  may  be  extended  by  mutual
agreement), either party shall be entitled to seek resolution of such dispute pursuant to Section 13.1.2 below.

13.1.2

to  applicable  federal  court 

Arbitration.  If the parties are unable to resolve a dispute on an issue of interpretation,
breach  or  enforcement  of  this  Agreement,  the  parties  shall  refer  such  dispute  to  be  finally  resolved  by  binding
arbitration under the terms of this Section 13.1.2, except that all disputes with respect to the validity or infringement of
Patents  shall  be  subject 
this
Section 13.1.2.  Whenever a party shall decide to institute arbitration proceedings, it shall give written notice to that
effect to the other party.  Any such arbitration shall be conducted under the commercial arbitration rules of the [***] in
effect,  which  are  deemed  to  be  incorporated  by  reference  into  this  paragraph  by  a  panel  of  three  (3)  arbitrators  in
[***].  Each party shall select one (1) arbitrator who is not employed by, or otherwise affiliated with, such party within
[***] ([***]) days after the institution of arbitration proceedings, and the two (2) arbitrators so selected shall designate
the  third  arbitrator.    The  parties  shall  use  their  commercially  reasonable  efforts  to  conclude  the  arbitration  hearings
within [***] ([***]) [***] following the confirmation of the third and presiding arbitrator.

jurisdiction  and  not  subject 

terms  of 

the 

to 

13.2

Injunctive  Relief.    This  Article  13  shall  not  be  construed  to  prohibit  either  party  from  seeking  preliminary  or
permanent  injunctive  relief,  restraining  order  or  degree  of  specific  performance  in  any  court  of  competent  jurisdiction  to  the  extent  not
prohibited by this Agreement.  For avoidance of doubt, any such equitable remedies provided under this Article 13 shall be cumulative and
not exclusive and are in addition to any other remedies, which either party may have under this Agreement or applicable law.

ARTICLE 14
MISCELLANEOUS

14.1

Governing Laws.  This Agreement and any dispute arising from the construction, performance or breach hereof shall
be governed by and construed, and enforced in accordance with, the laws of the state of New York, USA, without reference to conflicts of
laws principles.

14.2

Waiver.    It  is  agreed  that  no  waiver  by  either  party  hereto  of  any  breach  or  default  of  any  of  the  covenants  or

agreements herein set forth shall be deemed a waiver as to any subsequent and/or similar breach or default.

14.3

Assignment.   This  Agreement  shall  not  be  assignable  by  either  party  without  the  written  consent  of  the  other  party
hereto,  except  that  either  party  may  assign  this  Agreement,  without  such  consent,  to  an  entity  that  acquires  all  or  substantially  all  of  the
business  or  assets  of  such  party  whether  by  merger,  reorganization,  acquisition,  sale,  or  otherwise;  provided,  however,  that  within
[***]  ([***])  days  of  such  an  assignment,  the  assignee  shall  agree  in  writing  to  be  bound  by  the  terms  and  conditions  of  this
Agreement.  Any assignment in contravention of the

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

25

 
 
foregoing shall be null and void.  Subject to the foregoing, this Agreement shall bind and inure to the benefit of each party’s successors and
permitted assigns.

14.4

Independent Contractors.  The relationship of the parties hereto is that of independent contractors.  The parties hereto
are  not  deemed  to  be  agents,  partners  or  joint  venturers  of  the  others  for  any  purpose  as  a  result  of  this  Agreement  or  the  transactions
contemplated thereby.

14.5

Compliance with Laws.  In exercising their rights under this Agreement, the parties shall fully comply in all material
respects with the requirements of any and all applicable laws, regulations, rules and orders of any governmental body having jurisdiction
over  the  exercise  of  rights  under  this  license  including,  without  limitation,  those  applicable  to  the  discovery,  development,  manufacture,
distribution, import and export and sale of Ascentage Products pursuant to this Agreement.

14.6

Notices.    All  notices,  requests  and  other  communications  hereunder  shall  be  in  writing  and  shall  be  personally
delivered or by registered or certified mail, return receipt requested, postage prepaid, in each case to the respective address specified below,
or such other address as may be specified in writing to the other parties hereto and shall be deemed to have been given upon receipt:

If to Unity:

Unity Biotechnology, Inc.

Attention: [***]

1700 Owens Street, Suite 535
San Francisco, CA 94158, USA

Email: [***]

If to Ascentage:

Ascentage Pharma Group Corp. Ltd.

Room 201, QB3 Building, Medical City Avenue
Hi-Tech BioMed District, Taizhou City, Jiangsu Province
P.R. China, 225300
Attention: [***]

Email:  [***]

14.7

Severability.    In  the  event  that  any  provision  of  this  Agreement  becomes  or  is  declared  by  a  court  of  competent
jurisdiction to be illegal, unenforceable or void, this Agreement shall continue in full force and effect to the fullest extent permitted by law
without said provision, and the parties shall amend the Agreement to the extent feasible to lawfully include the substance of the excluded
term to as fully as possible realize the intent of the parties and their commercial bargain.  

14.8

Advice of Counsel.  Unity and Ascentage have each consulted counsel of their choice regarding this Agreement, and
each acknowledges and agrees that this Agreement shall not be deemed to have been drafted by one party or another and will be construed
accordingly.

14.9

Performance  Warranty.    Each  party  hereby  warrants  and  guarantees  the  performance  of  any  and  all  rights  and

obligations of this Agreement by its Affiliates and licensees.

26

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
14.10

Force Majeure.  Neither party shall lose any rights hereunder or be liable to the other party for damages or losses
(except for payment obligations) on account of failure of performance by the defaulting party if the failure is occasioned by war, strike, fire,
Act of God, earthquake, flood, lockout, embargo, governmental acts or orders or restrictions, failure of suppliers, or any other reason where
failure  to  perform  is  beyond  the  reasonable  control  and  not  caused  by  the  negligence,  intentional  conduct  or  misconduct  of  the  non-
performing  party  and  such  party  has  exerted  all  reasonable  efforts  to  avoid  or  remedy  such  force  majeure;  provided,  however,  that  in  no
event shall a party be required to settle any labor dispute or disturbance.

14.11

Complete Agreement.  This Agreement with its schedules and exhibits, constitutes the entire agreement, both written
and oral, between the parties with respect to the subject matter hereof, and all prior agreements respecting the subject matter hereof, either
written or oral, express or implied, shall be abrogated, canceled, and are null and void and of no effect.  No amendment or change hereof or
addition  hereto  shall  be  effective  or  binding  on  either  of  the  parties  hereto  unless  reduced  to  writing  and  executed  by  the  respective  duly
authorized representatives of Unity and Ascentage.

14.12

Headings.  The captions to the several Sections and Articles hereof are not a part of this Agreement, but are included

merely for convenience of reference and shall not affect its meaning or interpretation.

14.13

Counterparts.  This Agreement may be executed in counterparts, each of which shall be deemed to be an original and

all of which together shall be deemed to be one and the same agreement.

14.14

Bankruptcy.  All rights and licenses granted under or pursuant to this Agreement by each party as a licensor are, and
shall  otherwise  be  deemed  to  be,  for  purposes  of  Section  365(n)  of  Title  ll,  U.S.  Code  (the  “Bankruptcy  Code”),  licenses  of  rights  to
“intellectual property” as defined under section 101(35A) of the Bankruptcy Code.  The parties agree that each licensee of such rights under
this  Agreement,  shall  retain  and  may  fully  exercise  all  rights  and  elections  it  would  have  in  the  case  of  a  licensor  bankruptcy  under  the
Bankruptcy Code.  Each party agrees during the term of this Agreement to create or maintain current copies, or if not amenable to copying,
detailed descriptions or other appropriate embodiments, of all such intellectual property licensed to the other party.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

27

 
 
IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly executed by their authorized representatives and
delivered in duplicate originals as of the Signing Date.

ASCENTAGE PHARMA GROUP CORP. LTD.

UNITY BIOTECHNOLOGY, INC.

By:/s/ Dajun Yang

Name: Dajun Yang, MD, PhD

Title:  Chief Executive Officer

By: /s/ Nathaniel David

Name:  Nathaniel David, PhD

Title:  Chief Executive Officer

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
 
EXHIBIT 1.25

RESEARCH AGREEMENT

This  Research  Services  Agreement  (the  "Agreement")  is  made  this  2nd  day  of  February,  2016  (the  "Signing  Date")  by  and
between  Ascentage  Pharma  Group  Corp.  Ltd.,  a  [Hong  Kong  corporation]  (“Ascentage”),  with  a  business  address  at  11/F,  AXA
CENTRE,  Gloucester  Road,  Wanchai,  Hong  Kong,  and  Unity  Biotechnology,  Inc.,  a  Delaware  corporation  (“Unity”),  with  a  business
address at 1700 Owens Street, Suite 535, San Francisco, California 95158.

WHEREAS, Unity and Ascentage entered into that certain license agreement (the “APG-1252 License Agreement”) of even date
herewith,  pursuant  to  which  Unity  obtained  a  license  to  commercialize  that  certain  BCL-2/BCL-xL  inhibitor  known  as  “APG-1252”  for
indications other than Oncology Indications (as defined in the Library Agreement).

WHEREAS,  Unity  and  Ascentage  have  entered  into  that  certain  compound  library  and  option  agreement  (the  “Library
Agreement”) of even date herewith pursuant to which Ascentage has granted to Unity the right to screen Ascentage’s existing collection of
BCL-2/BCL-xL  inhibitor  compounds  as  well  as  any  additional  BCL-2/BCL-xL  inhibitor  compounds  discovered  by  Ascentage  during  the
term of the Library Agreement, in each case to identify compounds with potential utility in the treatment of age-related conditions other than
cancer;

WHEREAS, Unity wishes to fund certain research services by Ascentage in furtherance of its screening and analysis with respect
to  Ascentage’s  BCL-2/BCL-xL  inhibitor  compounds,  including  without  limitation  the  synthesis  and  derivatization  of  BCL-2/BCL-xL
inhibitor compounds discovered through such screening and analysis; and

WHEREAS, Ascentage wishes to provide such research services in accordance with the terms and conditions of this Agreement

and attached Project Addenda (as defined below).

WHEREAS, the parties intend for this Agreement to become effective as of the date on which the Second Amendment (as defined

in Section 5.8(a) below) takes effect (the “Effective Date”).

NOW, THEREFORE, in consideration of the premises and the mutual promises set forth in this Agreement, and other good and

valuable consideration, the exchange, receipt and sufficiency of which are acknowledged, the parties agree as follows:

1.0

Projects and Project Addenda.  

1.1

From time-to-time during the term of this Agreement Unity may request Ascentage to provide Unity with

certain services, including without limitation services relating to the discovery, synthesis, characterization and derivatization of novel BCL-
2/BCL-xL inhibitor compounds.   Upon reaching agreement with respect to the requested services (including the consideration to be paid to
Ascentage in connection with such services), a project addendum

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

1

 
 
 
describing in detail the activities to be conducted (such activities, collectively a “Project”) and consideration to be paid to Ascentage shall be
attached to this Agreement (each a “Project Addendum”), and such Project Addendum, together with this Agreement (but separate and apart
from any other Project Addendum), shall collectively constitute the entire agreement for such Project.  No Project Addendum, or any
modification thereto, shall be attached to or made a part of this Agreement without first being executed by the parties hereto in a writing
which specifically references this Agreement.  To the extent any terms set forth in a Project Addendum conflict with the terms set forth in
this Agreement, the terms of this Agreement shall control unless otherwise expressly agreed by the parties in such Project Addendum.

1.2

Within sixty (60) days of the Effective Date, the Unity and Ascentage shall agree upon the initial research

services to be provided by Ascentage, which agreement shall be documented in a project addendum to be attached hereto as Appendix A
(“Project Addendum No. 1”).  

2.0

Services.

2.1

General.

a)

Diligence.  Ascentage hereby agrees to (i) complete the services for Projects described in each

Project Addendum (the "Services"), (ii) comply with the terms of the applicable Project Addendum, and (iii) provide its Services under each
Project in the timeframe specified in the Project Addendum unless Ascentage later decides such Services cannot be completed within such
timeframe within commercially reasonable efforts by providing notice to Unity to request extended timeframe.  If an extended timeframe is
needed, both parties shall discuss in good faith about the new timeframe and the additional costs needed.  Ascentage is not obligated to
continue Services if such agreement is not achieved.

b)

Subcontractors.  Ascentage shall not assign, delegate, or subcontract any of the Services without

the prior written approval of Unity, which approval shall not be unreasonably withheld.  Notwithstanding the foregoing, it is agreed that prior
written approval of Unity shall not be required in the event that Ascentage wishes to delegate specific portions of the Services to one or more
of the following Affiliates and third party vendors listed on Appendix B, provided that Ascentage shall remain responsible for directly
performing of the majority of the Services. Ascentage shall remain liable under this Agreement for the performance of all its obligations
under this Agreement and shall be responsible for and liable for compliance by all permitted subcontractors with the applicable provisions of
this Agreement.  

2.2

Project Management.

a)

The “Project Coordinator” for Unity and the “Project Manager” for Ascentage will be specified in

the Project Addendum for each Project.  The Project Coordinator and the Project Manager will be responsible for day-to-day
communications between the parties regarding the subject matter of this Agreement, including without limitation all Project Addenda and
any Services and other activities conducted under any Project.

b)

The Project Coordinator and the Project Manager will be responsible for (i) monitoring the

schedules and progress of work pursuant to this Agreement;

2

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
(ii) receiving and submitting requests for information and/or assistance; (iii) determining whether a request he or she receives for information
and/or assistance from the other is necessary for the other party to complete a specific “Deliverable” (as defined in its respective Project
Addendum); (iv) receiving and submitting Deliverables; (v) cooperating to implement acceptance testing; and (vi) supervising and recording
the exchange of confidential information pursuant to this Agreement.

development effort and, if applicable, to exchange information and Deliverables.

c)

The Project Coordinator and the Project Manager will meet regularly to discuss the progress of the

perform Services as set forth in the Project Addenda at any time during the Term for a period longer than [***] days (as defined below),
Ascentage shall inform Unity and appoint a new Project Manager.

d)

Except in the case of an emergency, in the event the Project Manager will be unavailable to

2.3

Exclusive Services.  During the Term, Ascentage shall not, and shall ensure that the Project Manager and

Ascentage Personnel shall not, conduct the Services in conjunction with any other projects being conducted at Ascentage that would (a)
conflict with any of the provisions of this Agreement, or (b) preclude Ascentage from complying with the provisions hereof.  

2.4

Records; Reports; Further Assurances.  

a)

Records.  In connection with the Services performed hereunder, for each Project, Ascentage shall
ensure that the Project Manager and Ascentage Personnel who perform such Services shall maintain laboratory notebooks, records and data
(“Records”) in accordance with good laboratory and research practices and will make such records available to Unity or Unity's authorized
representative throughout the term of this Agreement during normal business hours upon reasonable notice at Unity’s expense.  Upon request
by Unity and at Unity's expense, Ascentage agrees to provide copies of all such materials to Unity within a reasonable timeframe, in
whatever condition maintained by Project Manager and Ascentage Personnel working on the Project.

b)

Reports.  Ascentage shall ensure that the Project Manager, and Ascentage Personnel working on a
Project, submit to Unity [***] within [***] ([***]) days after the end of each [***] a written technical report summarizing the research, data,
methods, results, conclusions and other information that the Project Manager considers material and relevant (“Results”) obtained therefrom
during the prior [***] ([***]) [***] period relating to such Project.  Within [***] ([***]) days after the completion or termination of a
Project, the Project Manager shall submit to Unity a final written technical report of major activities undertaken and major accomplishments
achieved in connection with such Project (the "Final Report").

3.0

Deliverables; Acceptance/Rejection/Correction.

3.1

Deliverables.  When Ascentage believes that a Deliverable has been appropriately completed under a

Project, Ascentage will deliver it to Unity.  Unity will accept or reject each Deliverable within [***] ([***]) days after delivery; failure to
give notice of

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

3

 
acceptance or rejection within that period will constitute acceptance.  Unity may reject a Deliverable only if such Deliverable fails to meet
the Specifications in material respect therefor stated in the applicable Project Addendum or as otherwise agreed to by the parties in writing.

3.2

Acceptance/Rejection/Correction.  If Unity rejects a Deliverable because such Deliverable fails to meet the

Specifications in material respect, Ascentage will [***] to promptly correct the failures within a timeframe that such failures can be corrected
with Ascentage’s [***].  When Ascentage believes that it has made the necessary corrections, Ascentage shall again deliver such Deliverable
to Unity and the acceptance/rejection/correction provisions above shall be reapplied until such Deliverable is accepted.  If Unity again rejects
the deliverable, the parties shall discuss the reasons for such failures and if such failures can be corrected with [***].  

4.0

Compensation and Payment.  

4.1

To fund the Services to be provided hereunder, for so long as this Agreement remains in effect Unity shall

pay to Ascentage Five Hundred Thousand U.S. Dollars ($500,000) per year, such amount to be paid in advance in [***] increments of [***]
U.S. Dollars ($[***]) (such funds, the “Advanced Funds”).  In consideration for Services rendered in connection with the performance of the
Projects, Ascentage shall be entitled to deduct from the Advanced Funds the amounts due to Ascentage in accordance with the payment
schedule (the "Payment Schedule") included in the respective Project Addendum attached to this Agreement.  Unless otherwise agreed,
compensation for Services will be on a time and materials basis, with time spent being accounted for based on the number of FTEs dedicated
to performing the applicable Services and the costs of materials and third party services being passed through without mark-up as further
described below.  Each Project Addendum shall set forth (a) the number of FTEs agreed upon by the parties, (b) the FTE Rate, and (c) the
agreed upon Out-of-Pocket Costs.  For purposes of this Agreement, “FTE” shall mean a full time dedicated scientific employee of
Ascentage, or if less than a full time dedicated scientific employee, a full time, equivalent scientific employee year based upon a total of
[***] ([***]) working hours per year of scientific work, on or directly related to the Services carried out by an employee dedicated to work
on a Project, in each case, having necessary qualifications to perform the Services.  “FTE Rate” means, unless otherwise agreed between the
Parties,  a rate per FTE equal to [***], which rate may be prorated on a daily or hourly basis as necessary and as may be adjusted from time
to time by mutual agreement of the Parties.   The FTE Rate is [***] and will cover [***].  Out-of-Pocket Costs” means travel (airfare, mobile
allowance, meal expenses, hotel expenses etc.) and other incidental expenses incurred by such personnel in the performance of the Services,
and amounts paid to third party vendors or contractors for services or materials provided by them directly in the performance of Services
under the applicable Project.  For clarity, Out-of-Pocket Costs do not include [***] all of which shall be included in the FTE Rate.  Any
Advanced Funds not utilized in any contract year may be carried forward to future contract years until expended.  To the extent that the value
of the Services requested by Unity in any contract year exceeds the amount of the Advanced Funds available in such contract year (i.e., Five
Hundred Thousand U.S. Dollars ($500,000) plus any unexpended Advanced Funds from prior years), the total payment for such contract
year shall be increased by an amount equal to the difference between the cost of the requested Services and the amount of the available
Advanced Funds  (such amount, the “Additional Research Payment”).  At Unity’s election, any Additional Research Payments from previous
contract years may be credited against the Five Hundred Thousand U.S.
4

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
Dollars ($500,000) funding obligation in subsequent years (e.g., in the event that Unity funds $750,000 of Services in contract year 1, Unity
would only be obligated to fund $250,000 in Services in contract year 2).     

4.2

In the event this Agreement or any Project Addendum is terminated pursuant to Article 5 of this Agreement,

Ascentage shall be compensated for accrued fees and expenses as set forth in Section 5.5 below.  Any funds held by Ascentage which are
unearned at the date of termination shall be returned to Unity within [***] ([***]) days of termination of a Project, Project Addendum or this
Agreement.

4.3

Payments to Ascentage shall be made to:

Ascentage Pharma Group Corp. Ltd.
[***]

4.4

Income taxes and withholding taxes (and any penalties and interest thereon) imposed on any payment made

by Unity to Ascentage, as well as any sales tax. value-added or similar taxes for which a seller of goods and services is generally responsible,
shall be the responsibility of Ascentage.

Ascentage shall ensure that its Project Manager and Ascentage Personnel maintain complete and accurate
accounting records related to their participation in the Project(s) in accordance with applicable generally accepted accounting principles.    

4.5

5.0

Term and Termination.

5.1

5.2

The term of this Agreement shall be four (4) years commencing upon the Effective Date (the “Term”).  

Commencing on the first anniversary of the Effective Date, this Agreement or any Project or Project

Addendum may be terminated by Unity, without cause, upon ninety (90) days’ notice to Ascentage.

5.3

This Agreement may be terminated by either party for material breach by the other party, provided that the

terminating party has given the breaching party written notice of the breach and at least sixty (60) days to cure the breach prior to the
effective date of termination.

5.4

Ascentage shall have the right to terminate this Agreement upon sixty (60) days’ written notice to Unity if in

any contract year Unity fails to pay Ascentage at least Five Hundred Thousand U.S. Dollars ($500,000) for Services contracted hereunder
(taking into account any permitted credits for previous Additional Research Funding as described in Section 4.1 above).    

5.5

Upon the effective date of termination, there shall be an accounting of costs and expenses related to the

Agreement, Project, or Project Addendum, as appropriate, conducted by Ascentage and subject to verification by Unity.  Within [***]
([***]) days after receipt of the results of such accounting and an invoice from Ascentage, Unity shall make a payment to

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

5

 
 
Ascentage (and/or Ascentage may retain from Advanced Funds previously paid by Unity) for Services performed, including:

a prior written authorization, incurred by Ascentage in performing Services until the effective date of termination and for which Ascentage
has not yet been paid by Unity; and

a)

actual reasonable, documented costs, to the extent approved by Unity in a Project Addendum or in

a Project Addendum or in a prior written authorization, by Ascentage prior to the effective date of termination to extent such obligations
cannot reasonably be mitigated.

b)

reasonable non-cancelable obligations incurred for the Project, to the extent approved by Unity in

pursuant to the applicable Project Addendum(a).

c)

accrued fees for FTEs, to the extent devoted to performance of Project(s) prior to termination and

Except as provided in this Section 5.5, Unity shall have no obligation of payment to Ascentage for
Services performed after the date of termination.  In no event shall Unity have any obligation with respect to fees or expenses otherwise not
approved by Unity in a Project Addendum or in a prior written authorization.

d)

Upon request, expiration, or termination of this Agreement, Ascentage will deliver and/or return to Unity all
materials containing Information of Unity, as well as data, records, information, reports and other property, furnished by Unity to Ascentage,
together with all copies of any of the foregoing at Unity’s expense.  

5.6

9.0, 10.0 and 14.0 through 25.0 hereof shall survive expiration or termination of any Project and/or this Agreement.

5.7

The obligations of the parties contained in Sections 2.4(b), 4.2-4.4 and 5.4 through 5.7 and Articles 6.0, 7.0,

5.8

Condition Precedent.  

a)

This Agreement is entered into subject to the condition precedent that Ascentage and the Regents

of the University of Michigan (“UM”) agree upon and execute an amendment to that certain license agreement, entered into by Ascentage
and the Regents of the University of Michigan (“UM”) effective as of December 1, 2010, adjusting the royalties owing to UM in connection
with the activities contemplated by the APG-1252 License Agreement and the Library Agreement (including the Compound License
Agreements contemplated by the Library Agreement) (such amendment, the “Second Amendment”).  All rights and obligations set forth in
the Agreement shall only become effective upon the Effective Date.  

b)

Ascentage hereby agrees to use its commercially best efforts to complete and execute the Second

Amendment as soon as reasonably practicable.

6.0

Confidentiality.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

6

 
6.1

Unity holds a proprietary interest in the written and oral information which Unity discloses to Ascentage and

identifies as confidential (hereinafter “Information”).  As used herein, the “Information” of Unity shall also include the
Deliverables.  Ascentage agrees to protect the confidentiality of any and all Information disclosed to Ascentage by Unity and to use such
Information solely for the performance of the Services described herein with the exception of the following which Ascentage can
demonstrate by competent written proof:  

becomes generally known to the public; or

a)

Information which is or (through no improper action or inaction by Ascentage or its employees)

with the legal right to disclose such information (including, without limitation, without any breach of the third party’s obligations to the
disclosing party); or

b)

Information which was rightfully disclosed to Ascentage by a third party without restriction and

Unity, as evidenced by its contemporaneous written records; or

c)

Information which was in Ascentage’ possession or was known to Ascentage prior to receipt from

such Information, as evidenced by its contemporaneous written records.

d)

Information which was independently developed by employees of Ascentage without access to

6.2

Except as expressly allowed herein, Ascentage agrees (i) to hold the Information in strict confidence and to

take all reasonable precautions to protect such Information, (ii) not to disclose, directly or indirectly, any Information or any information
derived therefrom to any third person (except employees of Ascentage, subject to the conditions stated below), and (iii) not to use such
Information, except as expressly permitted under this Agreement.  

6.3

Ascentage may disclose any Information that is required to be disclosed by law, government regulation or

court order.  If disclosure is required, Ascentage will give Unity at least [***] ([***]) business days advance notice (unless prohibited by law
or court order) so that Unity may seek a protective order or take other action reasonable in light of the circumstances.

7.0

Intellectual Property.

7.1

Ownership.  Subject to the rights and licenses granted to Unity under the Library Agreement and any

Compound License Agreement(s) (as defined in the Library Agreement) that the parties may subsequently enter into, as between the parties,
Ascentage shall own all right, title and interest (including patent rights, copyrights, trade secret rights, mask work rights, database rights and
all other intellectual property rights worldwide) in any inventions, works of authorship, mask works, ideas or information made or invented
by employees and any permitted subcontractors of Ascentage (collectively, "Ascentage Technology").  Right, title and interest to any
inventions, works of authorship, mask works, ideas or information that are made jointly by employees and/or permitted subcontractors of
Ascentage and Unity (collectively, "Joint Technology") shall be owned jointly.  For purposes of this Section 7.1 whether any inventions,
works of authorship, mask works, ideas or information that are made "jointly" shall be determined under the applicable laws of the United
States of America, including in the case of patentable inventions, the principles of inventorship established in Title 35 of the United States

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

7

 
Code (“US Patent Law”), and "joint ownership" means that Unity and Ascentage (subject to the rights granted by Ascentage to Unity under
the APG-1252 License Agreement and the Library Agreement (including any future license agreement(s) contemplated in the Library
Agreement), shall each be free to exploit such patent rights and authorize others to do so, with no obligation to obtain consent of the other or
to account to the other party for profits or otherwise.

7.2

Inclusion of Program Technology in Ascentage Intellectual Property.  All Ascentage Technology arising

under the Subcontracted Project Plan(s), together with Ascentage’s interest in all Joint Technology arising under the Subcontracted Project
Plan(s), shall be automatically included within the Ascentage Intellectual Property for purposes of the Library Agreement and any future
Compound License Agreement(s).

8.0

Representations, Warranties and Covenants.

Effective Date:

8.1

Representations and Warranties.  Each party represents and warrants to the other party that as of the

a)

b)

it has full power and authority to enter into and perform this Agreement;

neither its entering nor performing this Agreement will violate any right of or breach any

obligation to any third party under any agreement or arrangement between such party and such third party;  

8.2

Certain Covenants.

a)

b)

the work under this Agreement will be performed in a professional and workman-like manner;

Ascentage has and will obtain agreements with its employees requiring them to assign to

Ascentage all right, title and interest in any intellectual property they develop in the course of their employment by Ascentage.

9.0

Indemnification.  Ascentage agrees to indemnify and defend Unity and its directors, officers, employees, agents and

their respective successors, heirs and assigns (the “Unity Indemnitees”) against any losses, costs, claims, damages, liabilities or expense
(including reasonable attorneys’ and professional fees and other expenses of litigation) (collectively, “Liabilities”) arising, directly or
indirectly out of or in connection with Third Party claims, suits, actions, demands or judgments, to the extent resulting from (a) injuries to
persons or damages which occur on Ascentage’s premises or premises under the exclusive control of Ascentage, or (b) breach by Ascentage
of its representations, warranties and covenants under Article 8 above, or (c) the negligence or intentional misconduct of Ascentage or any of
its directors, officers, employees, agents or representatives, except in each case, to the extent such Liabilities result from the gross negligence
or intentional misconduct of Unity.

10.0

Dispute Resolution.  

8

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
10.1

Consultation.  If an unresolved dispute arises out of or relates to this Agreement, or the breach thereof,

either party may refer such dispute to the [***] of each party, who shall meet in person or by telephone within [***] ([***]) days after such
referral to attempt in good faith to resolve such dispute.  If such matter cannot be resolved by discussion of the respective [***] within such
[***] ([***]) days period (as may be extended by mutual agreement), either party shall be entitled to seek resolution of such dispute pursuant
to Section 10.2 below.

10.2

Arbitration.  If the parties are unable to resolve a dispute on an issue of interpretation, breach or

enforcement of this Agreement, the parties shall refer such dispute to be finally resolved by binding arbitration under the terms of this
Section 10.2, except that all disputes with respect to the validity or infringement of Patents shall be subject to applicable federal court
jurisdiction and not subject to the terms of this Section 10.2.  Whenever a party shall decide to institute arbitration proceedings, it shall give
written notice to that effect to the other party.  Any such arbitration shall be conducted under the commercial arbitration rules of the [***],
which are deemed to be incorporated by reference into this paragraph by a panel of three (3) arbitrators in [***].  Each party shall select one
(1) arbitrator who is not employed by, or otherwise affiliated with, such party within [***] ([***]) days after the institution of arbitration
proceedings, and the two (2) arbitrators so selected shall designate the third arbitrator.  The parties shall use their commercially reasonable
efforts to conclude the arbitration hearings within [***] ([***]) [***] following the confirmation of the third and presiding arbitrator.

10.3

Injunctive Relief.  This Article 10 shall not be construed to prohibit either party from seeking preliminary

or permanent injunctive relief, restraining order or degree of specific performance in any court of competent jurisdiction to the extent not
prohibited by this Agreement.  For avoidance of doubt, any such equitable remedies provided under this Article 10 shall be cumulative and
not exclusive and are in addition to any other remedies, which either party may have under this Agreement or applicable law.

11.0

Independent Contractor Relationship.  The parties hereto are independent contractors and nothing contained in this

Agreement shall be construed to place them in the relationship of partners, principal and agent, employer/employee or joint venturer.  Both
parties agree that neither shall have power or right to bind or obligate the other, nor shall either hold itself out as having such authority.

12.0

Publicity.  Except as required by law, neither party shall use the name of the other party nor of any employee of the

other party in connection with any publicity or media purposes without the prior written approval of the other party. It is understood and
agreed that Unity may disclose Ascentage’s performance of the Services hereunder with Ascentage’s prior written approval, including,
without limitation, by naming Ascentage, in government filings, regulatory disclosures and scientific publications.

13.0

Force Majeure.  Neither party shall lose any rights hereunder or be liable to the other party for damages or losses

(except for payment obligations) on account of failure of performance by the defaulting party if the failure is occasioned by war, strike, fire,
Act of God, earthquake, flood, lockout, embargo, governmental acts or orders or restrictions, failure of suppliers, or any other reason where
failure to perform is beyond the reasonable control and not

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

9

 
caused by the negligence, intentional conduct or misconduct of the non-performing party and such party has exerted all reasonable efforts to
avoid or remedy such force majeure; provided, however, that in no event shall a party be required to settle any labor dispute or disturbance.

14.0

Notices.  Any notice required or permitted to be given hereunder by either party hereunder shall be in writing and shall
be deemed given on the date received if delivered personally or by fax or [***] ([***]) days after the date postmarked if sent by registered or
certified U.S. mail, return receipt requested, postage prepaid to the following address:

If to Unity:

Unity Biotechnology, Inc.

Attention: [***]

1700 Owens Street, Suite 535
San Francisco, CA 94158, USA

Email: [***]

If to Ascentage:

Ascentage Pharma Group Corp. Ltd.

Room 201, QB3 Building, Medical City Avenue
Hi-Tech BioMed District, Taizhou City, Jiangsu Province
P.R. China, 225300
Attention: [***]
Email:  [***]

15.0

Governing Law.  This Agreement and any dispute arising from the construction, performance or breach hereof shall
be governed by and construed, and enforced in accordance with, the laws of the state of New York, USA, without reference to conflicts of
laws principles.

16.0

Severability.  In the event that any provision of this Agreement becomes or is declared by a court of competent

jurisdiction to be illegal, unenforceable or void, this Agreement shall continue in full force and effect to the fullest extent permitted by law
without said provision, and the parties shall amend the Agreement to the extent feasible to lawfully include the substance of the excluded
term to as fully as possible realize the intent of the parties and their commercial bargain.

17.0

Waiver.  Waiver or forbearance by either party or the failure by either party to claim a breach of any provision of this

Agreement or exercise any right or remedy provided by this Agreement or applicable law, shall not be deemed to constitute a waiver with
respect to any subsequent breach of any provision hereof.

18.0

Changes and Modification.  No changes or modifications of this Agreement or any Project Addendum shall be

deemed effective unless in writing and executed by the parties hereto.

19.0

Assignment.  Unity may assign this Agreement to an Affiliate (as defined in the Library Agreement).  Otherwise, this

Agreement may not be assigned by Ascentage or Unity without the prior written consent of the other, such consent not to be unreasonably
withheld, except that either party may assign this Agreement, without such consent, to an entity that acquires all or substantially all of the
business or assets of such party whether by merger,

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

10

 
 
reorganization, acquisition, sale, or otherwise; provided, however, that within [***] ([***]) days of such an assignment, the assignee shall
agree in writing to be bound by the terms and conditions of this Agreement.  Any assignment in contravention of the foregoing shall be null
and void.  Subject to the foregoing, this Agreement shall bind and inure to the benefit of each party’s successors and permitted assigns.

20.0

Advice of Counsel.  Unity and Ascentage have each consulted counsel of their choice regarding this Agreement, and
each acknowledges and agrees that this Agreement shall not be deemed to have been drafted by one party or another and will be construed
accordingly.

21.0

 Complete Agreement.  This Agreement with its schedules and appendices, constitutes the entire agreement, both

written and oral, between the parties with respect to the subject matter hereof, and all prior agreements respecting the subject matter hereof,
either written or oral, express or implied, shall be abrogated, canceled, and are null and void and of no effect.  No amendment or change
hereof or addition hereto shall be effective or binding on either of the parties hereto unless reduced to writing and executed by the respective
duly authorized representatives of Unity and Ascentage.

22.0

Compliance with Laws.  In exercising their rights under this Agreement, the parties shall comply in all material

respects with the requirements of any and all applicable laws, regulations, rules and orders of any governmental body of applicable
jurisdiction.

23.0

Headings.  The captions to the several Sections and Articles hereof are not a part of this Agreement, but are included

merely for convenience of reference and shall not affect its meaning or interpretation.

24.0

Counterparts.  This Agreement may be executed in counterparts, each of which shall be deemed to be an original and

all of which together shall be deemed to be one and the same agreement.

25.0

Bankruptcy.  All rights and licenses granted under or pursuant to this Agreement by each party as a licensor are, and

shall otherwise be deemed to be, for purposes of Section 365(n) of Title ll, U.S. Code (the “Bankruptcy Code”), licenses of rights to
“intellectual property” as defined under section 101(35A) of the Bankruptcy Code.  The parties agree that each licensee of such rights under
this Agreement, shall retain and may fully exercise all rights and elections it would have in the case of a licensor bankruptcy under the
Bankruptcy Code.  Each party agrees during the term of this Agreement to create or maintain current copies, or if not amenable to copying,
detailed descriptions or other appropriate embodiments, of all such intellectual property licensed to the other party.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

11

 
 
IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be duly executed by their authorized representatives and
delivered in duplicate originals as of the Signing Date.

ASCENTAGE PHARMA GROUP CORP. LTD.

UNITY BIOTECHNOLOGY, INC.

By:/s/ Dajun Yang

Name: Dajun Yang, MD, PhD

Title:  Chief Executive Officer

By: /s/ Nathaniel David

Name:  Nathaniel David, PhD

Title:  Chief Executive Officer

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

12

 
 
 
 
 
APPENDIX A
UNITY AND ASCENTAGE
MASTER SERVICES AGREEMENT
PROJECT ADDENDUM
DESCRIPTION OF SERVICES; PAYMENT SCHEDULE

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

13

 
 
 
[***]

APPENDIX B
PERMITTED AFFILIATES AND THIRD PARTY VENDORS

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

14

 
 
 
EXHIBIT 1.26

SENOLYTIC TEST

Part A: Protocol for Senolytic Test
•

[***]

Part B: [***]

[***]

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
EXHIBIT 2.2

COMPOUND FORMULATION

[***]

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
EXHIBIT 2.5.1

ASCENTAGE ACTIVE COMPOUNDS AS OF THE EFFECTIVE DATE

[***]

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
EXHIBIT 2.6

BIOCHEMICAL ASSAY

[***]

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
EXHIBIT 3.3.2(a)

FORM OF COMPOUND LICENSE AGREEMENT

This Compound License Agreement (the “Agreement”) effective as of the 

, 20 , [Insert date of designation
of applicable Development Candidate under Section 3.3.2(a) of the Compound Library and Option Agreement] (the “Effective Date”)
is made by and between Ascentage Pharma Group Corp. Ltd., a Hong Kong corporation (“Ascentage”), with a business address at 11/F,
AXA CENTRE, Gloucester Road, Wanchai, Hong Kong, and Unity Biotechnology, Inc., a Delaware corporation (“Unity”), with a business
address at 1700 Owens Street, Suite 535, San Francisco, California 95158. Each of Ascentage and Unity shall be a “Party,” and both the
“Parties.”

day of 

BACKGROUND

A.

Unity and Ascentage entered into (i) that certain Compound Library and Option Agreement dated February 2, 2016 (the
“Library  Agreement”),  pursuant  to  which  Unity  has  certain  rights  to  acquire  a  license  under  the  Licensed  Intellectual  Property  to
commercialize specified compounds, and (ii) that certain license agreement dated February 2, 2016 (the “APG-1252 License Agreement”),
pursuant to which Unity obtained a license to commercialize that certain BCL-2/BCL-xL inhibitor known as “APG-1252” for treatment of
age-related conditions; and

B.

Unity has exercised its rights under the Library Agreement to acquire from Ascentage such a license under the Licensed

Intellectual Property, all as set forth below on the terms and conditions herein.

NOW, THEREFORE, for and in consideration of the covenants, conditions, and undertakings hereinafter set forth, it is agreed by

and between the Parties as follows:

1.1

The following terms have the meanings set forth in the Library Agreement:

ARTICLE 1

DEFINITIONS

Active Compound 
Affiliate 
Ascentage Intellectual Property 
Back-up Compounds 
Compounds 
Development Candidates 
Greater China 
IND
Oncology Indications 
Patents 
Stock Agreement 
Technology 
Third Party

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
1.2

“Fair Market Value” means with respect to a share of Unity common stock, the average price that Unity common stock
is publicly trading at for [***] ([***]) days prior to the date in question, or, if the security is not publicly traded, the value of such stock as
determined  in  good  faith  by  Unity’s  board  of  directors  in  reliance  upon  Unity’s  most  recent  IRC  Section  409A  independent  valuation  of
Unity’s common stock that it used for the purposes of granting stock options to its employees.

1.3

“Control”  and  its  correlative  terms,  “Controlled”  or  “Controls”  shall  mean,  with  respect  to  any  Patent  or  item  of
Technology, that a Party or one of its Affiliates owns or possesses rights to such Patent or item of Technology sufficient to grant the access,
license  or  sublicense  contemplated  in  this  Agreement  without  violating  the  terms  of  any  agreement  or  other  arrangement  with  any  Third
Party.

1.4

“Cover” and its correlative terms, “Covers”, “Covered” or “Covering” means (a) with respect to an issued patent, that,
in the absence of a license, the use, offer for sale, sale, importation or manufacture of the product in question would infringe one or more
claims  of  such  patent  or  (b)  with  respect  to  a  pending  patent  application,  that,  in  the  absence  of  a  license,  the  use,  offer  for  sale,  sale,
importation or manufacture of the product in question would infringe one or more claims of such patent application, should such claims issue
as published.

1.5

“Enabling IP” means Patents and/or Technology of a Third Party that Covers or relates to a Licensed Product and is
necessary or useful for the research, development, manufacture, use, sale or import of Licensed Products, including Patents directed to the
composition and manufacture of Licensed Compounds, but excluding Patents related to formulation and therapeutic methods.

1.6

“EMA” means the European Medicines Agency and any successor agency.

1.7

“Existing Agreements” means (a) that certain Exclusive License Agreement between Unity and the Mayo Foundation
for  Medical  Education  and  Research  originally  entered  into  by  the  parties  effective  June  28th,  2013;  (b)  that  certain  Exclusive  License
Agreement between Unity and the Buck Institute for Research on Aging originally entered into by the parties effective February 3rd, 2014;
and (c) that certain Exclusive License Agreement between Unity and the Board of Trustees of the University of Arkansas originally entered
into by the parties effective April 28th, 2015.

1.8

1.9

“FDA” means the United States Food and Drug Administration and any successor agency.

“Field”  means  the  prophylaxis  and  treatment  of,  and  palliation  of  symptoms  associated  with,  indications  other  than

Oncology Indications.

1.10

“Generic Product” means a product which (a) contains as its active pharmaceutical ingredient a compound that is (or
is  substantially  the  same  as)  the  Licensed  Compound,  and  (b)  has  been  placed  on  the  market  pursuant  to  a  validly  granted  marketing
authorization.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

2

 
1.11

“Licensed Compound” means the Development Candidate listed in Schedule 1.11 hereto.

1.12
Licensed Product and [***].

“Licensed  Product-Specific  Patents”  means  those  Licensed  Patents  that  [***]  the  Licensed  Compound  and/or

1.13

1.14

“Licensed Intellectual Property” means the Licensed Patents and Licensed Technology.

“Licensed Patents” means Patents owned or Controlled by Ascentage or its Affiliates during the Term, in each case to

the extent Covering the Licensed Compound or a Licensed Product.

1.15

“Licensed Product” means a pharmaceutical product containing the Licensed Compound (either alone or with other

active pharmaceutical ingredients), in all forms, presentations, formulation and dosage forms.

1.16

“Licensed  Technology”  means  Technology  owned  or  Controlled  by  Ascentage  or  its  Affiliates  during  the  Term,  in
each  case  to  the  extent  such  Technology  is  necessary  or  reasonably  useful  for  the  development,  manufacture  or  commercialization  of  the
Licensed Compound or a Licensed Product.

1.17

“Marketing Approval Application” or “MAA” means a New Drug Application (or its equivalent), as defined in the
U.S. Food, Drug and Cosmetic Act and the regulations promulgated thereunder, or any corresponding or similar application, registration or
certification in any country.

(a)

“Net Sales” means the gross amount invoiced to non-Affiliate Third Parties on sales of Licensed
Products by Unity or its Affiliates or Third Party Sublicensees, less the actual amounts incurred, allowed, or paid for the following items (if
not previously deducted from the amount invoiced and provided that such deductions are calculated in accordance with generally accepted
accounting principles of the United States of America (“GAAP”) on a consistent basis): (a) trade, cash, and quantity discounts; (b) amounts
for  claims,  allowances  or  credits  for  returns,  rejections  or  recalls;  (c)  freight,  shipping  and  insurance  charges  allocable  to  such  Licensed
Products;  (d)  sales  taxes,  duties  and  other  governmental  charges  (including  value  added  tax)  on  particular  sales,  but  excluding  what  is
commonly known as income taxes; (e) government mandated rebates; (f) contracted rebates; and (g) a provision for uncollectible accounts;
in each case as determined from books and records of the selling party maintained in accordance with GAAP, as consistently applied by such
selling  party.  In  the  event  that  Unity  grants  a  sublicense  to  a  Third  Party  Sublicensee  hereunder,  and  receives  payments  based  upon  such
Third Party Sublicensee’s sales of Licensed Product, Unity may, with Ascentage’s consent, which consent shall not be unreasonably withheld
or delayed, substitute the definition of “Net Sales,” used by such Third Party Sublicensee to calculate its payments to Unity in place of the
foregoing definition of “Net Sales” for purposes of calculating royalties payable to Ascentage on such Third Party Sublicensee’s sales.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

3

 
1.18

“Phase I Clinical Trial” means a human clinical trial, the principal purpose of which is preliminary determination of

safety of a drug in healthy individuals or patients, that would satisfy the requirements of 21 C.F.R. §312.21(a).

1.19

“Phase II Clinical Trial” means a clinical trial of a drug conducted on a limited number of patients for the purpose of
preliminary evaluation of clinical efficacy and safety of such drug, and/or to obtain an indication of the dosage regimen required, in each
case that would satisfy the requirements of 21 C.F.R. 312.21(b).

1.20

“Phase III Clinical Trial” means a pivotal human clinical trial intended to gather additional information regarding the
safety and efficacy of the drug in patients with the disease being studied, which clinical study is designed to be of a size and statistical power
sufficient to support the filing of an MAA and that would satisfy the requirements of 21 C.F.R. 312.21(c).

1.21

“Territory” means the entire world excluding Greater China.

1.22

“Third Party Sublicensee”  means  any  Third  Party  to  which  Unity  licenses  the  right  to  commercialize  any  Licensed
Product.  For  the  avoidance  of  doubt,  “Third  Party  Sublicensee”  shall  not  include  Third  Party  distributors,  service  providers,  vendors  and
suppliers that do not have the right to market or promote Licensed Product.

1.23

“UM  License  Agreement”  means  that  certain  license  agreement  entered  into  by  Ascentage  and  the  Regents  of  the
University of Michigan (“UM”) effective as of December 1, 2010, as amended by all amendments to such license agreement existing as of
the Effective Date.

1.24

“Valid Claim” means a claim contained in an issued Patent within the Licensed Patents in any country that (a) has not
expired; (b) has not been disclaimed; (c) has not been cancelled or superseded, or if cancelled or superseded, has been reinstated; and (d) has
not  been  revoked,  held  invalid,  or  otherwise  declared  unenforceable  or  not  allowable  by  a  tribunal  or  patent  authority  of  competent
jurisdiction over such claim in such country from which no further appeal has or may be taken.

2.1

Licenses.

ARTICLE 2

LICENSES

Unity:

2.1.1

Development Licenses. Subject to the terms and conditions of this Agreement, Ascentage hereby grants to

a royalty-free, exclusive license in the Field and the Territory, with the right to grant sublicenses
as provided in Section 2.2, under the Licensed Intellectual Property to (i) research, develop and seek and obtain marketing approval for the
Licensed Compound and Licensed Products and (ii) package the Clinical Materials (as defined in Schedule 4.1) supplied by or on behalf of
Ascentage, in each case in the Field and Territory, and to have any of the foregoing performed on its behalf by a Third Party; and

(a)

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

4

 
a  royalty-free,  non-exclusive  license  in  the  Field  and  the  Territory,  with  the  right  to  grant
sublicenses as provided in Section 2.2, under the Ascentage Intellectual Property to manufacture or have manufactured Licensed Compound
and Licensed Product for non‑clinical research and development purposes.

(b)

2.1.2

Commercialization  Licenses.  Subject  to  the  terms  and  conditions  of  this  Agreement,  Ascentage  hereby
grants to Unity a royalty-bearing, exclusive license in the Field and the Territory, with the right to grant sublicenses as provided in Section
2.2, under the Licensed Intellectual Property: (a) to use the Licensed Compound supplied by or on behalf of Ascentage to make or have made
the  Licensed  Products;  (b)  to  make  or  have  made  Licensed  Products  and  all  components  thereof  (including  without  limitation,  Licensed
Compound) and (c) to use, offer for sale, sell, import, export, market, promote and distribute Licensed Compounds and Licensed Products; in
each case, solely for use in the Field and Territory, and to have any of the foregoing performed on its behalf by a Third Party. For clarity, it is
understood and agreed that Unity’s right under subsection (b) above to make or have made Licensed Products and all components thereof
may only be exercised as permitted under Schedule 4.1.

2.2

Sublicenses. Unity may grant and authorize sublicenses within the scope of the license granted to Unity pursuant to this
Agreement,  provided  that  for  clarity,  Unity  shall  remain  responsible  for  all  milestone  and  other  payments  due  to  Ascentage  under  this
Agreement based on the activities of Unity’s sublicensees.

2.3

Third Party Intellectual Property. If after the Effective Date, Ascentage acquires or licenses from a Third Party subject
matter that would fall within the Licensed Intellectual Property (“Third Party Intellectual Property”) that is subject to any payment obligation
to the Third Party, then Ascentage shall so notify Unity and Unity shall inform Ascentage if it wishes such subject matter to be included
within  the  Licensed  Intellectual  Property.  If  Unity  notifies  Ascentage  that  it  does  wish  such  subject  matter  to  be  so  included,  the  rights
granted to Unity hereunder with respect to such Third Party Intellectual Property shall be subject to Unity promptly reimbursing Ascentage
for [***] and Unity shall reimburse Ascentage for [***]. Upon request by Unity, Ascentage shall disclose to Unity a written description of
such payment obligations. Notwithstanding the foregoing, Unity shall have the right to treat amounts paid to Ascentage as reimbursements
for payments for Enabling IP for purposes of Section 5.5.

2.4

No Implied Licenses. Nothing herein shall be construed as granting Unity, by implication, estoppel or otherwise, any
license  or  other  right  (a)  to  any  intellectual  property  of  Ascentage  other  than  the  Licensed  Intellectual  Property  (b)  to  commercialize
Licensed Products outside of the Field and Territory (c) not relating to the Licensed Compound and Licensed Products or (d) any right or
license other than those expressly granted herein.

2.5

Exclusivity  with  Respect  to  Licensed  Compounds.  Ascentage  hereby  covenants  that  except  as  expressly  permitted
under any future agreement that the Parties may enter into pursuant to Article 8 below pertaining to the China JVCO, Ascentage shall not: (a)
research,  develop,  use  or  commercialize,  and  shall  not  authorize  any  Affiliate  or  other  Third  Party  to  research,  develop,  use  or
commercialize,  the  Licensed  Compound  or  any  Licensed  Product,  and  (b)  manufacture,  or  authorize  any  Third  Party  to  manufacture,  the
Licensed Compound or any Licensed Product, other than for supply to Unity in accordance with the terms of Schedule 4.1.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

5

 
2.6

[***]. The Parties agree that within [***] of the Effective Date of this Agreement they will put in place a procedure

pursuant to which [***] shall [***] that [***] to [***].

ARTICLE 3
DUE DILIGENCE

3.1

General.  Unity  shall  use  commercially  reasonable  efforts  to  develop  and  obtain  marketing  approval  for  at  least  one
Licensed  Product  hereunder,  and  thereafter  shall  use  commercially  reasonable  efforts  to  launch  and  commercialize  each  such  Licensed
Product and to fulfil the market demand therefor.

3.2

Diligence Milestones. Without limiting the it’s general diligence obligations under Section 3.1 above, Unity agrees that

it shall achieve the following diligence milestones with respect to the Licensed Compound by the deadlines specified below:

Milestone

Time Period

1. [***]

2. [***]

3. [***]

4. [***]

Within [***] ([***]) [***] of the Effective Date

Within [***] ([***]) [***] of the Effective Date

Within [***] ([***]) [***] of the Effective Date

Within [***] ([***]) [***] of the Effective Date

If Unity is unable to meet [***], as applicable, by the specified deadline, Unity shall none-the-less be deemed to be in compliance with its
diligence obligations hereunder so long as it [***].

3.3

Substitution of Licensed Compound.

General. If Unity elects to discontinue development of a Licensed Compound for [***] reasons, then Unity
shall  have  a  right  to  replace  such  abandoned  Licensed  Compound  with  the  Back-up  Compound  listed  in  Schedule  3.3.  Following  such
replacement pursuant to this Section 3.3, the Back-up Compound shall be considered a “Substitute Licensed Compound”.

3.3.1

Designation. In the event that Unity wishes to exercise its right under this Article 3 to select a Substitute
Licensed Compound, Unity will provide Ascentage with written notice specifying the Licensed Compound for which development is being
discontinued and the Back-up Compound that it wishes to replace it with (“Substitution Notice”).

3.3.2

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

6

 
 
3.3.3

Following  designation  of  a  Substitute  Licensed  Compound,  the  Parties  shall  promptly  update  Schedule
1.11 to  reflect  the  substitution  of  the  Substitute  Licensed  Compound for the current  Licensed  Compound.  Upon  any  such  substitution,  all
references to the “Licensed Compound” in this Agreement shall thereafter be deemed to refer to such Substitute Licensed Compound, and
the compound for which such Substitute Licensed Compound was substituted shall cease to be considered a Licensed Compound.

ARTICLE 4

MANUFACTURE AND SUPPLY

4.1

Subject to the terms and conditions of this Agreement, Ascentage (itself or through one or more Third Party contract
manufacturers)  shall  manufacture  and  supply  Unity,  its  Affiliates  and  their  Third  Party  Sublicensees  with  (a)  Clinical  Materials,  and  (b)
Licensed Compound, in each case in accordance with Schedule 4.1 (“Supply Terms”). Subject to the terms and conditions of this Agreement,
Unity shall purchase Clinical Materials and Licensed Compound from Ascentage in accordance with Schedule 4.1.  Upon  Unity’s  request,
Ascentage and Unity shall enter into a separate supply agreement substantially reflecting the Supply Terms set forth in Schedule 4.1 as well
as  other  customary  terms  and  conditions  (the  “Supply  Agreement”).  Unless  and  until  such  time  as  the  Parties  have  executed  the  Supply
Agreement, the terms of Schedule 4.1 shall govern any supply of Clinical Material and Licensed Compound requested by Unity.

5.1

Equity Grants.

ARTICLE 5

PAYMENTS

[***].  Upon  the  [***],  Unity  shall  issue  to  Ascentage  Three  Hundred  Ninety  Three  Thousand  Three
Hundred  Thirty  Five  (393,335)  shares  of  Unity  common  stock;  such  shares  to  be  issued  to  Ascentage  pursuant  to  the  Stock  Agreement
within [***] ([***]) days of date that [***] occurs. For clarity, [***].

5.1.1

[***]. Upon the [***], Unity shall issue to Ascentage the following number of shares of Unity common
stock based on how long after the Effective Date such [***]; such shares to be issued to Ascentage pursuant to the Stock Agreement within
[***] ([***]) days of date that such [***] occurs:

5.1.2

Effective Date.

(a)

(b)

[***] ([***]) shares of Unity common stock if such [***] occurs within [***] ([***]) [***] of the

[***] ([***]) shares of Unity common stock if such [***] occurs more than [***] ([***]) [***]

after the Effective Date but less than [***] ([***]) [***] after the Effective Date.

after the Effective Date.

(c)

[***] ([***]) shares of Unity common stock if such [***] occurs more than [***] ([***]) [***]

1252 License Agreement or any other Compound License

5.1.3

Equity Cap. Notwithstanding anything in the contrary in this Agreement, the Library Agreement, the APG-

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

7

 
Agreement,  the  maximum  cumulative  aggregate  number  of  shares  of  Unity  common  stock  that  Ascentage  is  eligible  to  receive  under
Sections 6.1 and 6.2 of the Library Agreement, Section 5.1 of the APG-1252 License Agreement, this Section 5.1 or Section 5.1 of any other
Compound License Agreement is:

(a)

(b)

[***] ([***]) shares of Unity common stock if only one Licensed Product is developed; and

Three Million Nine Hundred Thirty Three Thousand Three Hundred and Fifty (3,933,350) shares

of Unity common stock if two or more Licensed Products is developed.

5.2

Development/Sales Milestones. In partial consideration of the rights and licenses granted herein to Unity, Unity shall

pay Ascentage the following milestone payments.

[NTD:  PRIOR  TO  EXECUTION  PARTIES  TO  SELECT  ONE  OF  THE  THREE  OPTIONS  IN  THIS  SECTION  5.2
(DEVELOPMENT/SALES MILESTONES) AS WELL AS ONE OF THE THREE OPTIONS IN SECTION 5.3 (ROYALTIES) BASED
ON WHETHER THE LICENSED COMPOUND IS (1) A [***], (2) A [***] OR (3) A [***]]

Option 1 [***]. Within [***] ([***]) days after the first achievement by Unity (or any of its Affiliates or
Third  Party  Sublicensees)  of  each  of  the  following  milestones  with  respect  to  a  Licensed  Product  containing  a  [***],  Unity  shall  pay
Ascentage the corresponding milestone payment set forth below, in accordance with the payment provisions of Article 6 below:

5.2.1

Milestone Event

Milestone Payment

1. [***]:

2. [***]:

3. [***]:

4. [***]

5. [***]

Total per Licensed Product

$[***]

$[***]

$[***]

$[***]

$[***]

$[***]

Option 2: [***]. Within [***] ([***]) days after the first achievement by Unity (or any of its Affiliates or
Third Party Sublicensees) of each of the following milestones with respect to a [***], Unity shall pay Ascentage the corresponding milestone
payment set forth below, in accordance with the payment provisions of Article 6 below:

5.2.2

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

8

 
 
 
Milestone Event

Milestone Payment

1. [***]:

2. [***]:

3. [***]:

4. [***]

5. [***]

Total per Licensed Product

5.2.3

Option 3: [***].

$[***]

$[***]

$[***]

$[***]

$[***]

$[***]

Within  [***]  ([***])  days  after  the  first  achievement  by  Unity  (or  any  of  its  Affiliates  or  Third
Party Sublicensees) of each of the following milestones with respect to the [***] to achieve such milestone, Unity shall pay Ascentage the
corresponding milestone payment set forth below, in accordance with the payment provisions of Article 6 below:

(a)

Milestone Event

Milestone Payment

1. [***]:

2. [***]:

3. [***]:

4. [***]

5. [***]

Total per Licensed Product

$[***]

$[***]

$[***]

$[***]

$[***]

$[***]

Within  [***]  ([***])  days  after  the  first  achievement  by  Unity  (or  any  of  its  Affiliates  or  Third
Party Sublicensees) of each of the following milestones with respect to the [***] to achieve such milestone, Unity shall pay Ascentage the
corresponding milestone payment set forth below, in accordance with the payment provisions of Article 5 below:

(b)

1. [***]:

Milestone Event

9

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

Milestone Payment

$[***]

 
 
 
Milestone Event

Milestone Payment

2. [***]:

3. [***]:

Total per Licensed Product

5.2.4

Certain Additional Terms.

$[***]

$[***]

$[***]

considered one and the same Licensed Product for purposes of this Section 5.2.

(a)

For clarity, all forms, presentations, formulation and dosage forms of a Licensed Product shall be

(b)

If Unity begins development of one Licensed Product and a milestone payment is made under this
Section 5.2, and then Unity terminates development of such Licensed Product and begins development of a second Licensed Product, the
milestone  which  was  already  paid  under  this  Section  5.2  for  the  abandoned  Licensed  Product  will  not  be  repeated,  but  the  remaining
milestone  payments  hereunder  will  be  due  as  the  second  Licensed  Product  advances;  [NTD:  IN  THE  EVENT  OPTION  3  IS  SELECTED,
THE FOLLOWING ADDITIONAL SENTENCE SHALL BE ADDED TO SECTION 5.2.2(b): For clarity, it is acknowledged and agreed that
should the first Licensed Product be abandoned prior to achieving all of the milestones set forth Section 5.2.1(a), such remaining unpaid
milestones shall become due and payable when first achieved by the next Licensed Product.]

In its sole discretion, Unity may elect in lieu of the payment of the milestone payments owing to
Ascentage under this Section 5.2, to grant to Ascentage that number of shares of Unity common stock of equivalent value (based on the Fair
Market Value of such Unity common stock at the time of such grant).

(c)

5.3

Royalties.  In  partial  consideration  of  the  licenses  granted  herein  to  Unity,  Unity  shall  pay  to  Ascentage  a  running
royalty  equal  to  the  percentage  set  forth  below  on  the  Net  Sales  of  Licensed  Product  based  on  the  type  of  Compound  contained  in  such
Licensed Product, subject to any adjustments set forth in Sections 5.5 and 5.6, and in accordance with the payment provisions of Article 6
below.

5.3.1

Option 1: [***].

Annual Net Sales of Licensed Product

Applicable Royalty Rate

Portion  of  worldwide  annual  Net  Sales  of  the  Licensed  Product  less  than  or  equal  to  [***]  Dollars

[***]%

(US$[***])

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

10

 
 
Portion of worldwide annual Net Sales of the Licensed Product over [***] Dollars (US$[***])

[***]%

5.3.2

Option 2: [***].

Annual Net Sales of Licensed Product

Applicable Royalty Rate

Portion of worldwide annual Net Sales of the Licensed Product less than or equal to [***] Dollars (US$[***])

Portion of worldwide annual Net Sales of the Licensed Product over [***] Dollars (US$[***])

[***]%

[***]%

5.3.3

Option 3: [***].

the royalties set forth below:

(a)

With respect to Net Sales of the [***] to receive marketing approval, Unity shall pay to Ascentage

Annual Net Sales of Licensed Product

Applicable Royalty Rate

Portion of worldwide annual Net Sales of the Licensed Product less than or equal to [***] Dollars (US$[***])

Portion of worldwide annual Net Sales of the Licensed Product over [***] Dollars (US$[***])

[***]%

[***]%

the royalties set forth below:

(b)

With respect to Net Sales of the [***] to receive marketing approval, Unity shall pay to Ascentage

Annual Net Sales of Licensed Product

Applicable Royalty Rate

Portion of worldwide annual Net Sales of the Licensed Product less than or equal to [***] Dollars (US$[***])

Portion of worldwide annual Net Sales of the Licensed Product over [***] Dollars (US$[***])

[***]%

[***]%

5.4

Royalty  Term.  Unity’s  obligation  to  pay  royalties  on  Net  Sales  of  Licensed  Product  under  this  Agreement  shall
continue on a country-by-country and Licensed Product-by-Licensed Product basis until the later of (a) abandonment or expiration of the last
Valid Claim that claims the [***] contained in such Licensed Product in such country, (b) the date of expiry of any

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

11

 
 
 
 
 
applicable regulatory,  pediatric,  orphan  drug  or  data  exclusivity  obtained  for  such Licensed Product in such country, or (c) ten (10) years
after the first commercial sale of the Licensed Product by or under the authority of Unity in any country in the Territory.

5.5

Royalty Stacking. Unity shall be entitled to deduct from the amounts owing to Ascentage under Sections 5.2 and 5.3
above [***] percent ([***]%) of any royalties or other payments made to Third Parties for Enabling IP, provided that (a) the total aggregate
amount payable to Ascentage under Sections 5.2 and 5.3 in any [***] may not be reduced to less than [***] percent ([***]%) of the amounts
that would otherwise be due Ascentage in such [***], and

Unity  shall  not  be  entitled  to  deduct  any  royalties  or  other  payments  made  under  the  Existing
Agreements. If, in any [***], Unity is not able to fully recover its [***] percent ([***]%) portion of the payments due to a Third Party, it
shall be entitled to carry forward such right of off-set to future [***] with respect to the excess amount

(a)

5.6

Generic Products. If at any time during the term of this Agreement a Generic Product enters the market in any country
and has for a period of at least [***] ([***]) consecutive [***] a market share in such country of at least [***] percent ([***]%) of the then
combined  unit  volume  of  the  corresponding  Licensed  Product  (i.e.,  the  Licensed  Product  containing  the  same  active  pharmaceutical
ingredient(s) as are present in the Generic Product) and such Generic Product, then Unity’s obligation to pay royalties to Ascentage on Net
Sales of such Licensed Product in such country shall be to reduced to [***] percent ([***]%) of the amounts that would otherwise be due
Ascentage under Section 5.3 in such calendar quarter.

5.7

Maximum  Reduction  to  Royalties.  Notwithstanding  anything  to  the  contrary  in  this  Article  5,  in  no  event  shall  the
royalties owing to Ascentage with respect to Net Sales of a Licensed Product in any country be reduced by cumulative operation of Sections
5.5 and 5.6 to less than [***] percent ([***]%) of the amounts that would otherwise be due Ascentage under Section 5.3 in such calendar
quarter.

5.8

Combination  Products.  In  the  event  that  a  Licensed  Product  is  sold  for  a  single  price  in  combination  with  another
therapeutically active pharmaceutical ingredient, or other product or service, for which no royalty would be due hereunder if sold separately,
Net Sales from such combination sales, for purposes of calculating the applicable royalty rate and the applicable royalty due under Section
5.3  shall  be  calculated  by  multiplying  the  Net  Sales  of  the  combination  product  by  the  fraction  A/(A  +  B),  where  A  is  the  average  gross
selling price during the previous [***] of the Licensed Product sold separately and B is the gross selling price during the previous [***] of
the  therapeutically  active  ingredient,  product  or  service.  In  the  event  that  separate  sales  of  the  Licensed  Product  or  the  additional
therapeutically  active  ingredient,  product  or  service  were  not  made  during  the  previous  [***],  then  the  Net  Sales  shall  be  reasonably
allocated  between  such  Licensed  Product  and  such  other  active  ingredient,  product  or  service  as  agreed  upon  by  the  Parties,  or  failing
agreement, determined in accordance with Section 13.1 (Dispute Resolution) below.

5.9

Unity’s Covenant. Unity hereby agrees that any shares of common stock issued to Ascentage will not be diluted unless
diluted in good faith by Unity on a proportionate basis to the other shares of common stock of Unity outstanding at the time of any such
dilution, and subject to the anti-dilution protections as set forth in Unity’s certificate of incorporation, as may be amended

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

12

 
from time to time in good faith; provided further, that Unity shall not take actions that specifically treat Ascentage  differently  from  other
holders of common stock, or issue any capital stock in a manner which is intended to circumvent this covenant. The shares of common stock
issued to Ascentage  shall  be  duly  adjusted  for  any  bonus  issue,  share  split,  consolidation,  subdivision,  reclassification,  recapitalization  or
similar arrangement of Unity, in each case in accordance with, and as expressly contemplated by, Unity’s certificate of incorporation, as may
be amended from time to time in good faith.

ACCOUNTING; RECORDS; METHOD OF PAYMENT

ARTICLE 6

6.1

Royalty Reports; Payments, Invoices. After the first sale of a Licensed Product on which royalties are payable by Unity
hereunder, Unity shall make quarterly written reports to Ascentage within [***] ([***]) days after the end of each calendar quarter, stating in
each such report the number, description, and aggregate Net Sales of Licensed Product sold during the calendar quarter upon which a royalty
is payable under Article 5 above. Concurrently with the making of such reports, Unity shall pay to Ascentage all amounts payable pursuant
to Article 5 above, in accordance with the payment provisions of Section 6.3.

6.2

Records; Inspection. During the term of this Agreement and for a period of [***] ([***]) years thereafter, Unity and its
Affiliates  shall  keep  complete,  true  and  accurate  books  of  account  and  records  for  the  purpose  of  determining  the  amounts  payable  to
Ascentage under this Agreement. Ascentage shall have the right to cause an independent, certified public accountant reasonably acceptable
to Unity to audit such records to confirm gross sales, Net Sales and royalty payments for a period covering not more than the preceding [***]
([***]) years. Unity agrees to either: (a) require each of its Third Party Sublicensees to maintain similar books and records and to open such
records for inspection by an independent, certified public accountant reasonably satisfactory to such Third Party Sublicensee, on behalf of,
and  as  required  by,  Ascentage  for  the  purpose  of  verifying  payments  hereunder,  or  (b)  obtain  such  audits  rights  from  the  Third  Party
Sublicensee  for  itself  and  exercise  such  audit  rights  on  behalf  of  Ascentage  upon  Ascentage’s  request  and  disclose  the  results  thereof  to
Ascentage.  All  such  inspections  may  be  made  no  more  than  [***]  each  calendar  year  at  reasonable  times  and  on  reasonable  notice.  No
accounting  period  of  Unity  or  its  Affiliate  or  Third  Party  Sublicensee  shall  be  subject  to  audit  more  than  one  time  hereunder.  Such
independent,  certified  public  accountant  will  be  obliged  to  execute  a  reasonable  confidentiality  agreement  prior  to  commencing  any  such
inspection. The results of any inspection hereunder shall be provided to both Parties, and Unity shall pay any underpayment to Ascentage
within [***] ([***]) days. Inspections conducted under this Section 6.2 shall be at the expense of Ascentage (and Ascentage will reimburse
Unity’s reasonable out-of-pocket costs of those inspections conducted by Unity at Ascentage’s request under (b) above), unless a variation or
error producing an increase exceeding [***] percent ([***]%) of the amount stated for any period is established in the course of any such
inspection, whereupon all costs of such audit of such period will be paid by Unity.

6.3

Payment Method. All payments due hereunder shall be made in U.S. dollars, and shall be made by bank wire transfer in
immediately available funds to an account designated by Ascentage in a written notice to Unity. If any currency conversion shall be required
in connection

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

13

 
with the payment of royalties hereunder, such conversion shall be made by using the exchange rates used by Unity in calculating Unity’s
own revenues for financial reporting purposes.

6.4

Late  Payments.  Any  payments  due  from  Unity  that  are  not  paid  on  the  date  such  payments  are  due  under  this
Agreement shall bear interest at [***] ([***]%) above the then prevailing US Federal Funds Target Rate (Bloomberg page: FDTR )
per annum calculated on a daily basis and payable for the period from the date payment is due until the date payment is actually made. This
Section 6.4 shall in no way limit any other remedies available to any Party.

PATENT PROSECUTION AND ENFORCEMENT

ARTICLE 7

7.1

Prosecution of Patents within the Licensed Intellectual Property.

7.1.1

General.

right to control the preparation, filing, prosecution and maintenance of all Licensed Patents using patent counsel of its choice.

(a)

Except  as  set  forth  in  Section  7.1.1(b)  or  Section  7.1.1(c)  hereof,  Ascentage  shall  have  the  sole

(b)

Unity  shall  have  the  first  right,  but  not  the  obligation,  to  prepare,  file,  prosecute  and  maintain
Licensed Product-Specific Patents. Unity shall (i) keep Ascentage reasonably informed as to its filing and prosecution strategy for Licensed
Product-Specific  Patents  and  the  filing,  prosecution  and  maintenance  of  Licensed  Product-Specific  Patents,  (ii)  provide  Ascentage  with  a
reasonable opportunity to review drafts of proposed patent office submissions with respect to Licensed Product-Specific Patents; and (iii)
consider in good faith the requests and suggestions of Ascentage with respect to strategies for filing and prosecuting such Licensed Product-
Specific Patents. In the event that Unity desires to abandon or decline further responsibility for any such Licensed Product-Specific Patent,
Unity shall provide reasonable prior written notice to Ascentage of such intention to abandon or decline responsibility, but in no case later
than  [***]  ([***])  days  prior  to  any  required  action  relating  to  the  filing,  prosecution  or  maintenance  of  such  Licensed  Product-Specific
Patent, and Ascentage shall have the right, at its discretion, to assume such responsibility.

(c)

With respect to any Licensed Patent (other than a Licensed Product‑Specific Patent) that claims
the Licensed Compound and/or Licensed Product, Ascentage shall have the first right, but not the obligation, to prepare, file, prosecute and
maintain such Licensed Patent and shall (i) keep Unity reasonably informed as to its filing and prosecution strategy for such Licensed Patent
and  the filing, prosecution  and  maintenance  of  such  Licensed  Patent,  (ii)  provide Unity with a reasonable opportunity to review drafts of
proposed patent office submissions with respect to such Licensed Patent; and (iii) follow the directions given by Unity with respect to filing
and prosecuting such Licensed Patents, unless [***], in which case [***] and [***]. In the event that Ascentage desires to abandon or decline
further responsibility for any Licensed Patent, Ascentage shall provide Unity [***] notice and the opportunity to assume responsibility for
such Licensed Patent.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

14

 
For purposes of this Article 7, “prosecution and maintenance” of patents and patent applications shall be
deemed to include, without limitation, the conduct of interferences or oppositions, and/or requests for re-examinations, reissues or extensions
of patent terms.

7.1.2

7.2

Enforcement of Licensed Patents. If either Party determines that a Third Party is making, using or selling a product that

may infringe any Licensed Patent, that Party shall notify the other Party in writing.

7.2.1

Infringement by a Competitive Product.

(a)

With respect to any such infringing activity that involves the manufacture, use or sale by a Third
Party  of  any  product  that  [***]  (“Competitive  Product”),  Unity  shall  have  the  first  right,  at  its  sole  option,  to  bring  suit  to  enforce  any
Licensed  Patent,  and/or  to  defend  any  declaratory  judgment  action  with  respect  thereto  (“Enforcement  Action”);  provided,  however,  that
Unity shall keep Ascentage reasonably informed as to the defense and/or settlement of any such Enforcement Action. Ascentage shall have
the right to participate in any such Enforcement Action with counsel of its own choice at its own expense. All recoveries received by Unity
from  an  Enforcement  Action  shall  be  first  applied  to  reimburse  Unity’s  and  then  Ascentage’s  unreimbursed  expenses,  including  without
limitation,  reasonable  attorney’s  fees  and  court  costs.  Any  remainder  shall,  to  the  extent  the  same  pertains  to  an  infringing  activity  that
involves the manufacture, use or sale by a Third Party of any Competitive Product, be treated as Net Sales.

7.2.2

In  the  event  Unity  elects  not  to  initiate  an  Enforcement  Action  with  respect  to  any  commercially
significant infringing activity that involves the manufacture, use or sale by a Third Party of any Competitive Product within [***] ([***])
days of a request by Ascentage to do so ([***]), Ascentage may initiate such action at its expense. Unity shall have the right to participate in
any such action with counsel of its own choice at its own expense. All recoveries received by Ascentage from an Enforcement Action shall
be first applied to reimburse Ascentage’s and then Unity’s unreimbursed expenses, including without limitation, reasonable attorney’s fees
and court costs. Any remainder shall, to the extent the same pertains to an infringement of the Licensed Patents, be split [***].

7.2.3

Other  Instances  of  Infringement.  With  respect  to  any  such  infringing  activity  that  does  not  involve  the
manufacture, use or sale by a Third Party of a Competitive Product, Ascentage shall have the sole right, at its sole option, to bring suit to
enforce any Licensed Patent, and/or to defend any declaratory judgment action with respect thereto and to retain all recoveries received by
Ascentage in connection therewith.

7.3

Infringement  Claims  Against  Unity.  If  the  production,  sale  or  use  of  a  Licensed  Product  pursuant  to  this  Agreement
results in any claim, suit or proceeding alleging patent infringement against Unity (or its Affiliates or sublicensees), Unity shall promptly
notify Ascentage thereof in writing setting forth the facts of such claim in reasonable detail. As between the Parties, Unity will be entitled to
control the defense in any such action(s). Unity agrees to keep Ascentage reasonably informed of all material developments in connection
with any such claim, suit or proceeding as it relates to the Licensed Intellectual Property. Notwithstanding the above, Unity shall not admit
the invalidity of any Licensed Patent without written consent from Ascentage.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

15

 
7.4

Cooperation.  In  any  legal  action  undertaken  by  a  Party  pursuant  to  Sections  7.2  or  7.3  of  this  Agreement  (the  Party
bringing  or  defending  such  legal  action,  the  “Enforcing  Party”),  the  non-Enforcing  Party  shall  cooperate  fully  with  the  Enforcing  Party,
including without limitation by joining as a party plaintiff if necessary for legal standing and executing such documents as the Enforcing
Party may reasonably request. Upon the request of, and at the expense of, the Enforcing Party, the non-Enforcing Party shall make available
at  reasonable  times  and  under  appropriate  conditions  all  relevant  personnel,  records,  papers,  information,  samples,  specimens  and  other
similar materials in its possession.

7.5

No Implied Obligations.  Except  as  expressly  provided  in  this  Article  7,  neither  Party  has  any  obligation  to  bring  or

prosecute actions or suits against any Third Party for patent infringement.

7.6

UM  License  Agreement.  Notwithstanding  the  foregoing  provisions  of  this  Article  7,  with  respect  to  the  Licensed
Patents  subject  of  the  UM  License  Agreement,  Unity’s  rights  under  this  Article  7  shall  be  limited  to  the  extent  of  Ascentage’s  rights  to
prosecute and enforce such Licensed Patents under the UM License Agreement, provided that (a) with respect to Licensed Product-Specific
Patents that have been in-licensed from UM, to the extent the UM License Agreement will not permit Unity to control the prosecution of
such patents, Ascentage agrees to (i) share with Unity the information Ascentage receives from UM under Section 7.2 of the UM License
Agreement with respect to such patents, (ii) provide Unity with a reasonable opportunity to review and comment upon such information; and
(iii) pass along to UM Unity’s comments and requested actions, and (b) Ascentage shall at Unity’s request and expense cooperate with Unity
in order exercise the enforcement rights granted to Ascentage under Section 8.1 of the UM License Agreement, in each case permitted by the
UM License Agreement.

ARTICLE 8

OPTION FOR CHINA JOINT VENTURE

8.1

Option for China JVCO. Unity shall grant to Ascentage an option to commercialize Licensed Products in Greater China
jointly  with  Unity  through  the  joint  venture  entity  (“China  JVCO”)  to  be  established  in  accordance  with  Section  8.4  of  the  Library
Agreement (“JVCO Option”). The process for exercise of the JVCO Option and all documents relating to China JVCO shall be agreed upon
by [***] and [***] within [***] following the execution of the Library Agreement.

8.2

Limitation of Obligations; Certain Covenants.

Notwithstanding  anything  to  the  contrary,  nothing  in  this  Agreement  shall  be  deemed  to  have  granted
Unity or any of its sublicensees the right to develop, manufacture, distribute, sell or otherwise commercialize the Licensed Products in the
Greater China.

8.2.1

Ascentage  hereby  covenants  that  it  shall  not  develop,  manufacture,  distribute,  sell  or  otherwise
commercialize the Licensed Compound (including any Licensed Products containing the Licensed Compound) in the Greater China except
through the China JVCO. In the event of a breach by Ascentage of its obligations under this Section 8.2.2, the [***] and [***] shall [***].

8.2.2

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

16

 
8.2.3

Unity and Ascentage  hereby  covenant  that  they  shall  cooperate  with  respect  to  the  establishment  of  the
China  JVCO,  including  without  limitation  by  (a)  initiating  negotiation  of  the  form  agreements  relating  to  the  JVCO  within  [***]  of  the
effective date of the Library Agreement, (b) using commercially reasonable efforts to reach agreement on such form agreements within [***]
([***])  [***]  of  the  effective  date  of  the  Library  Agreement,  including  ensuring  that  [***]  and  [***]  devote  at  least  [***]  to  such
negotiations until such form agreements are agreed upon, and (c) signing the agreements for establishment of the China JVCO agreed upon
by [***] and [***].

ARTICLE 9

CONFIDENTIALITY

9.1

Confidential Information. Except as otherwise expressly provided herein, the parties agree that the receiving party shall
not, except as expressly provided in this Article 9, disclose to any Third Party or use for any purpose any information which is disclosed to it
by the other party, whether orally or in writing, and identified as confidential (“Confidential Information”), except to the extent that it can be
established by the receiving party by competent proof that such information:

time of disclosure;

(a)

(b)

disclosure to the receiving party;

Was already known to the receiving party, other than under an obligation of confidentiality, at the

Was  generally  available  to  the  public  or  otherwise  part  of  the  public  domain  at  the  time  of  its

disclosure and other than through any act or omission of the receiving party in breach of this Agreement;

(c)

Became  generally  available  to  the  public  or  otherwise  part  of  the  public  domain  after  its

the disclosing party as demonstrated by documented evidence prepared contemporaneously with such independent development; or

(d)

Was independently developed by the receiving party without reference to information provided by

Party who had no obligation to the disclosing party not to disclose such information to others.

(e)

Was disclosed to the receiving party, other than under an obligation of confidentiality, by a Third

9.2

Permitted Use and Disclosures. Each party hereto may use or disclose Confidential Information of the other party to the
extent such use or disclosure is reasonably necessary in the following instances: (a) exercising the rights granted to it hereunder (including,
in the case of Unity, developing, commercializing and/or sublicensing of Licensed Products) or in carrying out its obligations hereunder; (b)
filing or prosecuting Patents as permitted by this Agreement;

prosecuting  or  defending  litigation;  and  (d)  complying  with  applicable  court  orders  or
governmental  regulations.  Notwithstanding  the  foregoing,  in  the  event  a  party  is  required  to  make  a  disclosure  of  the  other  party’s
Confidential Information pursuant to clause (c) or (d) of this Section 8.2, it will, except where impracticable, give reasonable advance notice
to the disclosing party of such disclosure and use efforts to secure confidential treatment of

(a)

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

17

 
such information at least as diligent as such party would use to protect its own confidential information, but in no event less than reasonable
efforts. In addition, Unity shall have the right to disclose Confidential Information regarding the Licensed Compound or Licensed Products
to Third Parties in connection with due diligence or similar investigations, to potential Third Party investors, and others on a need to know
basis, in each case under terms of confidentiality that are appropriate for the circumstances, or to the extent required by law.

9.3

Nondisclosure of Terms.  Each  of  the  parties  hereto  agrees  not  to  disclose  the  terms  of  this  Agreement  to  any  Third
Party without the prior written consent of the other party hereto, which consent shall not be unreasonably withheld; provided that a party may
disclose the terms of this Agreement without such consent to such party’s attorneys and advisors, to Third Parties in connection with due
diligence  or  similar  investigations,  to  potential  Third  Party  investors,  and  others  on  a  need  to  know  basis,  in  each  case  under  terms  of
confidentiality that are appropriate for the circumstances, or to the extent required by law.

9.4

Public Announcement. Unity may, in its discretion, issue a press release announcing the formation of this Agreement,
which shall be substantially in a form approved by Ascentage prior to execution of the Agreement. Except with respect to such initial release
or  as  otherwise  required  by  law,  neither  party  shall  issue  an  additional  press  release  or  public  announcement  relating  to  this  Agreement
without the prior written approval of the other party, which shall not be withheld unreasonably. Either party may refer to the license granted
under  this  Agreement  in  promotional  and  other  communications  with  prospective  customers  and  investors,  subject  to  the  prior  written
approval of the other party of the form, substance and intended use of such reference, and provided that such disclosure shall not include any
technical  details  or  any  financial  terms  of  the  license.  For  purposes  of  clarification,  after  a  party  has  obtained  the  other  party’s  written
approval  of  the  form,  substance  and  intended  use  of  a  particular  reference,  no  further  approval  of  the  other  party  will  be  required  for
inclusion of the same reference in future communications that are intended for the same use.

ARTICLE 10
INDEMNIFICATION

10.1

Unity.  Unity  agrees  to  indemnify  and  defend  Ascentage  and  its  directors,  officers,  employees,  agents  and  their
respective  successors,  heirs  and  assigns  (the  “Ascentage  Indemnitees”)  against  any  losses,  costs,  claims,  damages,  liabilities  or  expense
(including  reasonable  attorneys’  and  professional  fees  and  other  expenses  of  litigation)  (collectively,  “Liabilities”)  arising,  directly  or
indirectly  out  of  or  in  connection  with  Third  Party  claims,  suits,  actions,  demands  or  judgments,  to  the  extent  (a)  relating  to  Licensed
Products developed, manufactured, used, sold or otherwise distributed by or on behalf of Unity, its Affiliates, sublicensees or other designees
(excluding  Ascentage,  its  Affiliates  and  licensees)  including,  without  limitation,  product  liability  and  patent  infringement  claims,  or  (b)
resulting  from  a  breach  by  Unity  of  its  representations  and  warranties  under  this  Agreement,  except,  in  each  case,  to  the  extent  such
Liabilities  result  from  the  negligence  or  intentional  misconduct  of  Ascentage  or  Ascentage’s  breach  of  its  representations  and  warranties
under this Agreement, including without limitation its product warranties under Section 1.13 of Schedule 4.1.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

18

 
10.2

Ascentage. Ascentage  agrees  to  indemnify  and  defend  Unity  and  its  directors,  officers,  employees,  agents  and  their
respective heirs and assigns (the “Unity Indemnitees”) against any Liabilities arising, directly or indirectly out of or in connection with Third
Party claims, suits, actions, demands or judgments, to the extent resulting from a breach by Ascentage of its representations and warranties
under this Agreement, including without limitation its product warranties under Section 1.13 of Schedule 4.1, except, in each case, to the
extent such Liabilities result from the negligence or intentional misconduct of Unity or Unity’s breach of its representations and warranties
under this Agreement.

10.3

Procedure.  In  the  event  that  any  party  intends  to  claim  indemnification  under  this  Article  10  (each  such  party,  an
“Indemnitee”)  it  shall  promptly  notify  the  other  Party  in  writing  of  such  alleged  Liability.  The  indemnifying  Party  shall  have  the  right  to
control the defense thereof with counsel of its choice as long as such counsel is reasonably acceptable to Indemnitee; provided, however, that
any Indemnitee shall have the right to retain its own counsel at its own expense, for any reason, including if representation of any Indemnitee
by  the  counsel  retained  by  the  indemnifying  Party  would  be  inappropriate  due  to  actual  or  potential  differing  interests  between  such
Indemnitee  and  any  other  Party  reasonably  represented  by  such  counsel  in  such  proceeding.  The  indemnifying  Party  shall  keep  the
Indemnitee  regularly  informed  of  the  status  of  the  defense  of  any  action,  claim  or  liability  covered  by  this  Article  10  and  shall  take  into
consideration the Indemnitee’s reasonable comments thereon. The affected Indemnitee shall cooperate with the indemnifying Party and its
legal representatives in the investigation of any action, claim or liability covered by this Article 10. The Indemnitee shall not compromise or
settle any claim or suit, or voluntarily incur any expense with respect to any such claim or suit, in each case, without the prior written consent
of  the  indemnifying  Party,  which  such  Party  shall  not  be  required  to  give.  The  failure  to  deliver  written  notice  to  the  indemnifying  Party
within a reasonable time after the commencement of any action with respect to any action, claim or liability covered by this Article 10, if
prejudicial to its ability to defend such action, shall relieve the indemnifying Party of any liability to the Indemnitee under this Article 10.

ARTICLE 11

REPRESENTATIONS AND WARRANTIES

11.1

General Warranties. Each Party represents and warrants to the other Party that it is a corporation duly organized and
validly existing under the laws of the state or country of its incorporation, the execution, delivery and performance of this Agreement by
such  Party  has  been  duly  authorized  by  all  requisite  corporate  action,  and  it  has  the  power  and  authority  to  execute  and  deliver  this
Agreement and to perform its obligations hereunder (including, in the case of Ascentage, granting the rights and licenses described in Article
2).

11.2

Ascentage Warranties. Ascentage represents and warrants on its own behalf and on behalf of its Affiliates that as of

the Effective Date:

except as otherwise disclosed to Unity in writing prior to the Effective Date, (i) Ascentage has not
received written notice from a Third Party claiming that the Licensed Compound infringes the intellectual property rights of any Third Party,
and (ii) Ascentage is not a party to any legal action, suit or proceeding relating to the Licensed Compound.

(a)

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

19

 
except as otherwise disclosed to Unity in writing prior to the Effective Date, there are no actual or
pending actions, suits or claims, by any Third Party (i) challenging the ownership of the Licensed Compound; or (b) challenging the validity,
effectiveness, enforceability, or ownership of the Licensed Intellectual Property.

(b)

except as otherwise disclosed to Unity in writing prior to the Effective Date, the Licensed Patents
are  subsisting,  in  force  or  pending,  as  the  case  may  be,  and  are  not  the  subject  of  any  interference,  reissue,  reexamination,  opposition,
cancellation or similar administrative proceedings.

(c)

except as otherwise disclosed to Unity in writing prior to the Effective Date, Ascentage has not
brought a claim alleging an infringement by a Third Party of any of the Licensed Patents and to Ascentage’s actual knowledge, there is no
actual or alleged infringement by a Third Party of any of the Patents within the Licensed Patents.

(d)

there are no Patents: (a) filed by Ascentage and subsequently assigned to Third Party, or (b) with
respect to which Ascentage or its Affiliates have acquired rights from a Third Party (i.e., through in-licenses, cross-licenses or otherwise), in
each case that (i) would be required for Unity to research, develop, manufacture, use or commercialize the Licensed Compound and (ii) are
not included within the Licensed Intellectual Property.

(e)

(f)

except as otherwise disclosed to Unity in writing prior to the Effective Date, there are no actual or
pending suits or claims by any Third Party asserting that the manufacture, use, sale, offer for sale or importing of the Licensed Compound
infringes the intellectual property of a Third Party and to Ascentage’s knowledge, the development and commercialization of the Licensed
Compound  would  not  infringe  (i)  any  issued  Patents  of  any  Third  Party  (other  than  Patents  in-licensed  from  UM),  or  (ii)  any  published
Patent claim of any Third Party (other than claims of Patents in-licensed from UM) if such claim were to issue as published.

Ascentage  has  disclosed  to  Unity  all  material  agreements  with  Third  Parties  in  effect  as  of  the
Effective Date pursuant to which Licensed Intellectual Property was licensed, acquired or sold, including without limitation all amendments
to the UM License Agreement entered into by UM and Ascentage subsequent to the effective date of the License Agreement.

(g)

Property that are inconsistent with the rights and licenses granted to Unity herein.

(h)

Ascentage  has  not  previously  granted  and  will  not  grant  any  rights  in  the  Licensed  Intellectual

11.3

Certain Rights and Obligations under the UM License Agreement.

same would materially and adversely affect Unity’s rights under this Agreement.

(a)

Ascentage shall not modify, amend or otherwise alter the UM License Agreement to the extent the

(b)
(b) provide or fail to provide any consent or approval with respect

Ascentage shall not (a) exercise or fail to exercise any right under the UM License Agreement or

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

20

 
to  any  right  or  obligation  under  the  UM  License  Agreement,  in  each  case  to  the  extent  the  same  would  materially  and  adversely  affect
Unity’s rights under this Agreement.

(c)

Ascentage shall not unilaterally terminate the UM License Agreement.

11.4

Disclaimer.  EXCEPT  AS  OTHERWISE  EXPRESSLY  SET  FORTH  IN  THIS  AGREEMENT,  NEITHER  PARTY
MAKES  ANY  REPRESENTATIONS  OR  EXTENDS  ANY  WARRANTIES  TO  THE  OTHER  PARTY  OF  ANY  KIND,  EITHER
EXPRESS  OR  IMPLIED,  REGARDING  THE  LICENSED  COMPOUND,  LICENSED  PRODUCTS  OR  THE  LICENSED
INTELLECTUAL  PROPERTY,  INCLUDING,  BUT  NOT  LIMITED  TO,  WARRANTIES  OF  MERCHANTABILITY,  FITNESS  FOR  A
PARTICULAR PURPOSE, NONINFRINGEMENT, AND VALIDITY OF LICENSED INTELLECTUAL PROPERTY CLAIMS, ISSUED
OR PENDING.

11.5

Limitation of Liability. EXCEPT FOR LIABILITY FOR BREACH OF ARTICLE 9, NEITHER PARTY SHALL BE
ENTITLED  TO  RECOVER  FROM  THE  OTHER  PARTY  ANY  SPECIAL,  INCIDENTAL,  CONSEQUENTIAL  OR  PUNITIVE
DAMAGES IN CONNECTION WITH THIS AGREEMENT; provided, however, that this Section 11.5 shall not be construed to limit either
party’s indemnification obligations under Article 10.

ARTICLE 12

TERM AND TERMINATION

12.1

Term. The term of this Agreement shall commence on the Effective Date and, unless earlier terminated as provided in
this Article 12, shall continue in full force and effect on a country-by-country basis until the expiration of all royalty obligations pursuant to
this Agreement for such country, as provided in Section 5.4 above. Unity’s license with respect to the Licensed Technology shall survive the
expiration (but not an earlier termination) of this Agreement, provided that such license shall thereafter become nonexclusive and fully paid-
up.

12.2

Termination  for  Breach.  Either  Party  may  terminate  this  Agreement  in  the  event  that  the  other  Party  shall  have
materially  breached  or  defaulted  in  the  performance  of  any  of  its  material  obligations  hereunder,  and  such  breach  or  default  shall  have
continued  for  sixty  (60)  days  after  written  notice  of  such  breach  and  intent  to  terminate  this  Agreement  therefor  was  provided  to  the
breaching Party by the nonbreaching Party. Any such termination shall become effective at the end of such sixty (60) day period unless the
breaching Party has cured any such breach or default prior to the expiration of the sixty (60) day period. Notwithstanding the foregoing, if
the Party alleged to be in breach of this Agreement in good faith disputes such breach within such sixty (60) day period, the nonbreaching
Party  shall  not  have  the  right  to  terminate  this  Agreement  unless  it  has  been  determined  by  arbitration  pursuant  to  Section  13.2  that  this
Agreement was materially breached, and the breaching Party fails to comply with its obligations hereunder within sixty (60) days after such
determination.

12.3

Termination by Unity. Any provision herein notwithstanding, Unity may terminate this Agreement, in its entirety or as
to any particular Patent within the Licensed Patents, or as to any particular Licensed Product, at any time by giving Ascentage at least ninety
(90) days prior

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

21

 
written notice. From and after the effective date of a termination under this Section 12.3 with respect to a particular Patent in a particular
country, such Patent shall cease to be within the Licensed Patents for all purposes of this Agreement, and all rights and obligations of Unity
with respect to such Patent(s) shall terminate. From and after the effective date of a termination under this Section 12.3 with respect to a
particular Licensed Product, the license granted under Section 2.1 above shall terminate with respect to such Licensed Product, and the same
shall  cease  to  be  a  Licensed  Product  for  all  purposes  of  this  Agreement.  Upon  a  termination  of  this  Agreement  in  its  entirety  under  this
Section 12.3, all rights and obligations of the parties shall terminate, except as provided in Section 12.4 below. For clarity, Unity shall remain
obligated to pay any and all milestone and other payments accrued, due and payable to Ascentage prior to such termination.

12.4

Effect of Termination.

12.4.1

Accrued  Obligations.  Expiration  or  any  termination  of  this  Agreement  shall  not  release  either  Party
hereto from any liability which at the time of such expiration or termination has already accrued to such Party or which is attributable to a
period prior to such expiration or termination, subject to the terms of this Agreement, nor preclude either Party from pursuing any rights and
remedies it may have hereunder or at law or in equity which accrued to it prior to such expiration or termination, subject to the terms of this
Agreement.

12.4.2

Sales of Existing Inventory of Licensed Product. In the event this Agreement is terminated for any reason
with  respect  to  a  Licensed  Product  after  the  first  approval  of  an  MAA  for  such  Licensed  Product,  Unity  shall  provide  Ascentage  with  a
written inventory of all quantities of such Licensed Product that Unity and its Affiliates have in stock and, for a period of [***] ([***]) [***]
after such termination, Unity and its Affiliates shall have the right to sell or otherwise dispose of such Licensed Product, all subject to the
payment to Ascentage of royalties pursuant to Article 5 hereof.

12.4.3

Survival of Sublicenses. Upon termination of this Agreement for any reason, any sublicense granted by
Unity hereunder to a Third Party Sublicensee shall survive, provided that such Third Party Sublicensee continues to pay to Ascentage the
milestones and royalties that would have been due to Ascentage under this Agreement based on such Third Party Sublicensee’s activities had
this Agreement not terminated. For clarity, in the event that a Third Party Sublicensee fails to pay to Ascentage the applicable milestones and
royalties  due  to  Ascentage  based  on  such  Third  Party  Sublicensee’s  activities,  Ascentage  shall  be  entitled  to  terminate  such  surviving
sublicense by providing such Third Party Sublicensee written notice of termination, which notice shall take effect [***] ([***]) days after it
is received by such Third Party Sublicensee unless such Third Party Sublicensee has cured any such breach or default prior to the expiration
of the [***] ([***]) day period.

termination of the Library Agreement, and vice versa.

12.4.4

Library  Agreement.  This  Agreement  is  independent  of,  and  shall  not  be  affected  by,  the  expiration  or

Survival. Articles 1 (Definitions), 6 (Accounting; Records; Method of Payment), 9 (Confidentiality), 10
(Indemnification), 13 (Dispute Resolution) and 14 (Miscellaneous) and Sections 7.2.1 (with respect to any ongoing Enforcement Action),
11.3, 11.4 and 12.4 shall survive the expiration or termination of this Agreement for any reason. Except as

12.4.5

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

22

 
otherwise provided in this ARTICLE 12, all rights and obligations of the parties under this Agreement shall terminate upon the expiration or
termination of this Agreement.

ARTICLE 13

DISPUTE RESOLUTION

13.1

Dispute Resolution. If an unresolved dispute arises out of or relates to this Agreement, or the breach thereof, either
Party may refer such dispute to the [***] of Unity and Ascentage, who shall meet in person or by telephone within [***] ([***]) days after
such referral to attempt in good faith to resolve such dispute. If such matter cannot be resolved by discussion of such officers within such
[***] ([***]) days period (as may be extended by mutual agreement), either Party shall be entitled to seek resolution of such dispute pursuant
to Section 13.2 below.

13.2

Arbitration. If the parties are unable to resolve a dispute on an issue of interpretation, breach or enforcement of this
Agreement, the parties shall refer such dispute to be finally resolved by binding arbitration under the terms of this Section 13.2, except that
all disputes with respect to the validity or infringement of Patents shall be subject to applicable federal court jurisdiction and not subject to
the terms of this Section 13.2. Whenever a party shall decide to institute arbitration proceedings, it shall give written notice to that effect to
the other party. Any such arbitration shall be conducted under the [***] by a panel of three (3) arbitrators in [***]. Each party shall select
one (1) arbitrator who is not employed by, or otherwise affiliated with, such party within [***] ([***]) days after the institution of arbitration
proceedings, and the two (2) arbitrators so selected shall designate the third arbitrator. The parties shall use their commercially reasonable
efforts to conclude the arbitration hearings within [***] ([***]) [***] following the confirmation of the third and presiding arbitrator.

13.3

Injunctive  Relief.  Each  Party  shall  be  free  to  seek  preliminary  or  permanent  injunctive  relief,  restraining  order  or
degree of specific performance in any court of competent jurisdiction. For avoidance of doubt, any such equitable remedies provided under
this Section 13.3 shall be cumulative and not exclusive and are in addition to any other remedies, which either Party may have under this
Agreement or applicable law.

ARTICLE 14
MISCELLANEOUS

14.1

Governing Laws. This Agreement and any dispute arising from the construction, performance or breach hereof shall
be governed by and construed, and enforced in accordance with, the laws of the state of New York, USA, without reference to conflicts of
laws principles.

14.2

Waiver.  It  is  agreed  that  no  waiver  by  either  Party  hereto  of  any  breach  or  default  of  any  of  the  covenants  or

agreements herein set forth shall be deemed a waiver as to any subsequent and/or similar breach or default.

14.3

Assignment.  This  Agreement  shall  not  be  assignable  by  either  party  without  the  written  consent  of  the  other  party
hereto,  except  that  either  party  may  assign  this  Agreement,  without  such  consent,  to  an  entity  that  acquires  all  or  substantially  all  of  the
business or assets of such party to which this Agreement relates, whether by merger, reorganization, acquisition, sale, or otherwise; provided,
however, that within [***] ([***]) days of such an assignment, the assignee

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

23

 
shall agree in writing to be bound by the terms and conditions of this Agreement. Subject to the foregoing, this Agreement shall bind and
inure to the benefit of each party’s successors and permitted assigns.

14.4

Independent Contractors. The relationship of the Parties hereto is that of independent contractors. The Parties hereto
are  not  deemed  to  be  agents,  partners  or  joint  venturers  of  the  others  for  any  purpose  as  a  result  of  this  Agreement  or  the  transactions
contemplated thereby.

14.5

Compliance with Laws. In exercising their rights under this Agreement, the Parties shall fully comply in all material
respects with the requirements of any and all applicable laws, regulations, rules and orders of any governmental body having jurisdiction
over  the  exercise  of  rights  under  this  license  including,  without  limitation,  those  applicable  to  the  discovery,  development,  manufacture,
distribution, import and export and sale of Licensed Products pursuant to this Agreement.

14.6

Notices.  All  notices,  requests  and  other  communications  hereunder  shall  be  in  writing  and  shall  be  personally
delivered or by registered or certified mail, return receipt requested, postage prepaid, in each case to the respective address specified below,
or such other address as may be specified in writing to the other Parties hereto and shall be deemed to have been given upon receipt:

If to Unity:

Unity Biotechnology, Inc. 

1700 Owens Street, Suite 535 
San Francisco, CA 94158, USA 
Attention: [***] 
Email: [***]

If to Ascentage:

Ascentage Pharma Group Corp. Ltd. 

Room 201, QB3 Building, Medical City Avenue
Hi-Tech BioMed District, Taizhou City, Jiangsu Province 
P.R. China, 225300 
Attention: [***] 
Email: [***]

14.7

Severability.  In  the  event  that  any  provision  of  this  Agreement  becomes  or  is  declared  by  a  court  of  competent
jurisdiction to be illegal, unenforceable or void, this Agreement shall continue in full force and effect to the fullest extent permitted by law
without said provision, and the Parties shall amend the Agreement to the extent feasible to lawfully include the substance of the excluded
term to as fully as possible realize the intent of the Parties and their commercial bargain.

14.8

Advice of Counsel. Unity and Ascentage have each consulted counsel of their choice regarding this Agreement, and
each acknowledges and agrees that this Agreement shall not be deemed to have been drafted by one Party or another and will be construed
accordingly.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

24

 
14.9

Performance  Warranty.  Each  Party  hereby  warrants  and  guarantees  the  performance  of  any  and  all  rights  and

obligations of this Agreement by its Affiliates, licensees and sublicensees.

14.10

Force Majeure.  Neither  Party  shall  lose  any  rights  hereunder  or  be  liable  to  the  other  Party  for  damages  or  losses
(except for payment obligations) on account of failure of performance by the defaulting Party if the failure is occasioned by war, strike, fire,
Act  of  God,  earthquake,  flood,  lockout,  embargo,  unusual  and  unexpected  governmental  intervention,  failure  of  suppliers,  or  any  other
reason where failure to perform is beyond the reasonable control and not caused by the negligence, intentional conduct or misconduct of the
non-performing Party and such Party has exerted all reasonable efforts to avoid or remedy such force majeure; provided, however, that in no
event shall a Party be required to settle any labor dispute or disturbance.

14.11

Complete  Agreement.  This  Agreement  with  its  schedules,  together  with  the  Library  Agreement  and  its  exhibits,
constitutes the entire agreement, both written and oral, between the Parties with respect to the subject matter hereof, and all prior agreements
respecting the subject matter hereof, either written or oral, express or implied, shall be abrogated, canceled, and are null and void and of no
effect.  No  amendment  or  change  hereof  or  addition  hereto  shall  be  effective  or  binding  on  either  of  the  Parties  hereto  unless  reduced  to
writing and executed by the respective duly authorized representatives of Unity and Ascentage.

14.12

Headings. The captions to the several Sections and Articles hereof are not a Part of this Agreement, but are included

merely for convenience of reference and shall not affect its meaning or interpretation.

14.13

Counterparts. This Agreement may be executed in counterparts, each of which shall be deemed to be an original and

all of which together shall be deemed to be one and the same agreement.

14.14

Bankruptcy. All rights and licenses granted under or pursuant to this Agreement by each Party as a licensor are, and
shall  otherwise  be  deemed  to  be,  for  purposes  of  Section  365(n)  of  Title  ll,  U.S.  Code  (the  “Bankruptcy  Code”),  licenses  of  rights  to
“intellectual property” as defined under section 101(35A) of the Bankruptcy Code. The Parties agree that each licensee of such rights under
this  Agreement,  shall  retain  and  may  fully  exercise  all  rights  and  elections  it  would  have  in  the  case  of  a  licensor  bankruptcy  under  the
Bankruptcy Code. Each Party agrees during the term of this Agreement to create or maintain current copies, or if not amenable to copying,
detailed descriptions or other appropriate embodiments, of all such intellectual property licensed to the other Party.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

25

 
 
IN WITNESS WHEREOF, the Parties hereto have caused their duly authorized representatives to execute this Agreement.

ASCENTAGE PHARMA GROUP CORP. LTD.

UNITY BIOTECHNOLOGY, INC.

By:

Name: Dajun Yang, MD, PhD

Title: Chief Executive Officer

Schedule 1.11 – Licensed Compound 
Schedule 3.3 – Back-up Compound 
Schedule 4.1 – Supply Terms

By:

Name: Nathaniel David, PhD

Title: Chief Executive Officer

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

26

 
 
 
SCHEDULE 1.11 

LICENSED COMPOUND

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
SCHEDULE 3.3 

BACK-UP COMPOUND

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
 
SCHEDULE 4.1 

SUPPLY TERMS

1.1

Product Supply. Ascentage shall supply Unity, its Affiliates and Sublicensees with such quantities of Clinical Materials

and Licensed Compound as Unity, its Affiliates and Sublicensees may order from time-to-time during the term of the Agreement.

1.2

Clinical Supplies. Unity shall be entitled to order quantities of Clinical Materials and Licensed Compound for use in
clinical trials and for development purposes (e.g., stability studies and other analytical purposes) in accordance with the terms of this Section
1.2.

Clinical  Materials.  As  used  herein,  “Clinical  Materials”  shall  means  Licensed  Product  that  has  been
manufactured, labeled and packaged in compliance with applicable laws relating to experimental materials to be administered to human test
subjects.

(a)

Prior  to  completion  of  Phase  II  Clinical  Trial.  Prior  to  the  completion  of  the  first  Phase  II  Clinical  Trial
carried out by Unity, its Affiliates and Sublicensees with respect to the Licensed Product, Ascentage shall supply to Unity the quantities of
Clinical Materials that Unity may order from time-to-time order from Ascentage in accordance with this Section 1.2.

(b)

(c)

After completion of Phase II Clinical Trial. Following completion of the first Phase II Clinical Trial carried
out  by  Unity,  its  Affiliates  and  Sublicensees  with  respect  to  the  Licensed  Product,  Ascentage  shall  supply  to  Unity  the  quantities  of  (i)
Clinical  Materials  and/or  (ii)  Licensed  Compound,  that  Unity  may  order  from  time-to-time  order  from  Ascentage  in  accordance  with  this
Section 1.2, in each case for use by Unity, its Affiliates and Sublicensees in carrying out additional clinical studies of the Licensed Product.

(d)

Procedures. Unity shall periodically submit purchase orders to Ascentage for quantities of Clinical Materials
and/or  Licensed  Compound,  which  purchase  orders  shall  set  forth  the  specific  quantities  needed,  requested  delivery  date  and  shipping
instructions. Such purchase orders shall be submitted to Ascentage with a minimal lead time [***]. Ascentage shall supply the quantities of
Clinical  Materials  and/or  Licensed  Compound  ordered  by  Unity  by  the  delivery  date  designated  by  Unity  in  the  relevant  purchase  order
provided such order has been placed by Unity with at least the minimum lead time [***]. Ascentage does not guarantee fulfillment of any
purchase orders less than the minimal lead time, however Ascentage will use commercially reasonable efforts to fulfill those purchase orders.
No terms contained in any purchase order, order acknowledgment or similar standardized form shall be construed to amend or modify the
terms of this Schedule 4.1 and in the event of any conflict, this Schedule 4.1 shall control, unless the Parties otherwise expressly agree in
writing.

1.3

Commercial  Supply.  Unity  shall  be  entitled  to  order  quantities  Licensed  Compound  for  use  in  the  manufacture  of

Licensed Product for commercial use in accordance with the terms of this Section 1.3.

commercial supplies of Licensed Compound, and thereafter at

(a)

Rolling Forecasts. At least [***] ([***]) [***] prior to the first calendar quarter for which Unity will order

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
least [***] ([***]) [***] prior to the start of each subsequent calendar quarter, Unity shall provide Ascentage with an updated rolling written
forecast of the quantities of the Licensed Compound estimated to be required on a month-by-month basis during the first calendar quarter for
which Unity will order commercial supplies of the Licensed Compound for sale in the Unity Territory (“Q1”) and the next three (3) quarters
(“Q2”, “Q3”, “Q4”, respectively). Unity shall only be obligated to purchase, and Ascentage shall only be obligated to supply, the quantities
of Licensed Compound set forth in such forecast to the extent provided in Section 1.3(b) below.

(b)

Orders.

(i)

Orders. Together with each forecast provided under Section 1.3(a) above (the “Current Forecast”),
Unity shall place its purchase order with Ascentage for delivery in Q1 of that quantity of Licensed Compound equal to the greater of: (i) the
quantity of Licensed Compound reflected for Q1 in the Current Forecast; (ii) [***] percent ([***]%) of the quantity forecast for Q2 in the
forecast provided under Section 1.3(a) above for the immediately preceding calendar quarter (the “First Preceding Forecast”); and (iii) [***]
percent ([***]%) of the quantity forecast for Q3 in the forecast immediately preceding the First Preceding Forecast (the “Second Preceding
Forecast”). Ascentage shall accept such orders from Unity, subject to the remaining terms and conditions of this Agreement, provided that
Ascentage shall not be obligated to accept orders for Q1 to the extent the quantity ordered exceeds the lesser of: (i) [***] percent ([***]%) of
the quantity forecast for Q2 in the First Preceding Forecast; and (ii) [***] percent ([***]%) of the quantity forecast for Q3 in the Second
Preceding Forecast, but shall use good faith efforts to fill orders for such excess quantities from available supplies.

(ii)

Form of Order.

Unity’s orders shall be made pursuant to a purchase order which is in a form mutually
acceptable to the Parties, and shall provide for shipment in accordance with reasonable delivery schedules as agreed upon from time to time
by  Ascentage  and  Unity.  Unless  otherwise  agreed,  each  order  shall  be  for  a  minimum  of  [***]  ([***])  [***].  Ascentage  shall  accept  all
purchase orders delivered by Unity in accordance with this Schedule 4.1, and shall notify Unity within [***] ([***]) days from receipt of an
order of its ability to fill any amounts of such order in excess of the quantities that Ascentage is obligated to supply.

(1)

Notwithstanding  the  foregoing,  during  the  period  between  the  submission  of  the  first
purchase order for Licensed Compound under this Section 1.3 and [***] ([***]) months thereafter (“Ramp-Up Period”),  Unity  may  order
Product in any mutually agreed quantities provided that the timing of manufacture and delivery of such quantities of Licensed Compound, as
well as the minimum remaining shelf life (as defined in Section 1.7) of such Licensed Compound at the time of delivery to Unity, shall be
subject to mutual agreement on an order-by-order basis. The Parties shall reasonably cooperate during the Ramp-Up Period to coordinate
Ascentage’s manufacturing of other quantities with Unity’s orders during the Ramp-Up Period.

(2)

(3)

No  terms  contained  in  any  purchase  order,  order  acknowledgment  or  similar

standardized form shall be construed to amend or modify the terms of

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

2

 
this Agreement and in the event of any conflict, this Agreement shall control, unless the Parties otherwise expressly agree in writing.

1.4

Delivery.  With  respect  to  exact  shipping  dates,  Ascentage  shall  [***]  (a)  ship  the  ordered  quantities  of  Licensed
Compound for commercial use on the dates specified in Unity’s purchase orders submitted and accepted in accordance with Section 1.3(b)
above or (b) for Clinical Materials and Licensed Compound for use in clinical trials, to ship quantities of the Clinical Materials and Licensed
Compound ordered by Unity pursuant to Section 1.2, on the dates requested by Unity in accordance with such Section. All Clinical Materials
and  Licensed  Compound  for  use  in  clinical  trials  ordered  under  Section  1.2,  and  Licensed  Compound  for  commercial  use  ordered  under
Section 1.3(b) (such Clinical Materials and Licensed Compound, collectively “Products”) will be delivered [***] (Incoterms 2010) named
place of destination. Title and all risk of loss, delay or damage to the Products shall pass to Unity upon [***]. The shipping packaging shall
be in accordance with good commercial practice and agreed by the Parties before shipment with respect to protection of the Product during
transportation.

1.5

Specifications  and  Manufacturing  Standards.  Ascentage  shall  only  release  Product  for  shipment  to  Unity  which
complies with: (a) [***] (“Specifications”); and (b) [***] (“Manufacturing Standards”). Ascentage also agrees to meet the requirements of
any regulatory authority in the Territory[***] as soon as reasonably practicable on the condition that: (i) Unity shall notify Ascentage of such
requirements;  and  (ii)  any  increased  cost  to  Ascentage  associated  with  preparing  for,  coming  into  compliance  with,  and  meeting  such
requirements  shall  be  [***].  The  Parties  shall,  at  [***]  before  commencement  of  deliveries  of  the  Product  to  Unity,  conclude  a  separate
quality agreement in a format suitable for submission to the Regulatory Authorities in all countries of the Territory, recording the agreed-
upon  Specifications  and  Manufacturing  Standards  and  measures  to  assure  compliance  with  cGMP  regarding  manufacturing,  storage,
transportation and release of Product (“Quality Agreement”).

1.6

Inspection; Product Rejection. Unity shall, promptly upon receipt of each shipment of the Product, perform a customary

inspection.

(a)

Each shipment of the Product to Unity shall be accompanied by the following written documentation: (i) the
date of manufacture; (ii) delivered amount of Product units; (iii) a certificate of conformance issued by an Ascentage qualified person; (iv) a
certificate of analysis setting forth the results of tests performed by Ascentage as required by the Specifications and Manufacturing Standards
and (v) any other documentation set forth in the Quality Agreement.

(b)

If the Product supplied by Ascentage under this Agreement fails to conform to the applicable Specifications
and  Manufacturing  Standards,  Unity  shall  notify  Ascentage  no  later  than  [***]  ([***])  [***]  after  its  receipt  of  the  Product  of  such  non-
conformity and Unity shall immediately present reasonable evidence to Ascentage of such non-conformity. Except as provided in Section
1.6(c) below, if Unity fails to notify Ascentage within such [***] ([***]) [***] period of any non-conformity, the Product shall be deemed to
conform to the applicable Specifications and Manufacturing Standards.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

3

 
(c)

Notwithstanding the last sentence of Section 1.6(b) above, if within [***] ([***]) [***] after Unity’s receipt
of any Product, Unity discovers any Latent Defects in such Product, Unity shall immediately notify Ascentage in writing and shall present
reasonable evidence to Ascentage of such Latent Defects together with such notice. In such case, Ascentage shall replace Product in which
such Latent Defects have been discovered in accordance with Section 1.6(d) below, it being understood that the foregoing shall not serve to
limit  Ascentage’s  obligations  under  Section  10.2  to  indemnify  Unity  for  Third  Party  Claims  arising  from  a  breach  by  Ascentage  of  its
product  warranties  under  Section  1.13  of  this  Schedule  4.1.  For  purposes  of  this  Section  1.6,  “Latent  Defect(s)”  shall  mean  any  non-
conformity of Product to the applicable Specifications and/or Manufacturing Standards at the time of the delivery of Product to Unity that
[***]

(d)

Ascentage shall replace, at no additional expense to Unity, any Product rejected by Unity pursuant to Section
1.6(b), or any Product in respect of which Unity notifies Ascentage a Latent Defect has been discovered in accordance with Section 1.6(c), as
applicable,  with  new  Product  which  does  conform  with  the  Specifications  and  Manufacturing  Standards  [***]  after  receipt  of  Unity’s
notification under Section 1.6(b) or Section 1.6(c), as applicable. The Parties may appoint a [***] to analyze any unit of the Product rejected
by  Unity  under  Section  1.6(b),  or  in  respect  of  which  Unity  notifies  Ascentage  a  Latent  Defect  has  been  discovered  in  accordance  with
Section 1.6(c), as applicable, and, if [***] that the Product was conforming, then Unity shall be responsible for payment for any such units of
Product  and  any  replacement  Product  shipped  by  Ascentage.  Ascentage  shall  give  Unity  written  instructions  as  to  how  Unity  should,  at
Ascentage’s  expense,  dispose  of  any  non-conforming  Product,  and  such  instructions  shall  comply  with  all  appropriate  governmental
requirements. The costs of any Third Party determination initiated under this Section 1.6(d) shall be borne by the non-prevailing party.

1.7

Shelf  Life.  Except  as  otherwise  agreed  pursuant  to  Section  1.3(b)(ii)(2),  all  Licensed  Compound  ordered  by  Unity
pursuant to Section 1.3 (i.e., all Licensed Compound to be used in the manufacture of Licensed Product for commercial use) shall at the time
of receipt by Unity or its designee, have a minimum shelf-life [***].

1.8

Documentation.  Ascentage  shall  keep  and  maintain  for  a  duration  in  accordance  with  applicable  laws:  (i)  reference
samples and quality control records for each batch of raw material and packaging material used in the manufacture of the Product; and (ii)
manufacturing and quality control records for each batch of the Product.

1.9

Purchase Price.

Product plus [***] percent ([***]%).

(a)

Unity  shall  pay  to  Ascentage  a  purchase  price  for  each  Product  equal  to  the  Cost  of  Goods  Sold  for  such

by or on behalf of Ascentage to Unity as follows:

(b)

“Cost of Goods Sold” or “COGS” means the cost of goods sold of Products ordered by Unity and supplied

(i)

To  the  extent  the  Product  is  manufactured  by  a  Third  Party  under  contract  with  Ascentage,  and

supplied to Unity by Ascentage, the Cost of Goods Sold shall mean (1) [***] (2) [***].

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

4

 
To the extent the Product is manufactured or otherwise processed by Ascentage,  Cost  of  Goods
Sold shall mean Direct Expenses and Manufacturing Overhead incurred by Ascentage in, and reasonably allocable to, the manufacture of
such Product.

(ii)

(iii)

As used herein:

quantities of Product, for supply to Unity[***] (A) [***], (B) [***], (C) [***], (D) [***], (E) [***], (F) [***], and (G) [***].

(1)

(2)

“Direct Expenses” are (A) [***], and (B) [***].

“Manufacturing  Overhead”  consists  of  a  [***]  associated  with  the  manufacture  of

Cost of Goods Sold shall be calculated consistent with [***], and shall be consistent from year-to-year. The
methodology  to  be  used  in  making  the  allocations  for  any  costs  included  in  Cost  of  Goods  Sold  shall  upon  request  be  reviewed  by  the
Parties.

(b)

1.10

Facilities. Ascentage shall manufacture or have manufactured all Product at the Facility(ies) and in accordance with,
and shall only release the Products for shipment to Unity which complies with: (i) the Specifications for the Products; and (ii) all applicable
Manufacturing  Standards  and  all  requirements  set  forth  in  the  Quality  Agreement.  As  used  in  this  Schedule  4.1,  “Facility”  shall  mean
Ascentage’s  or  Ascentage’s  Third  Parties  contractors  cGMP-compliant  facilities  through  which  the  Products  supplied  to  Unity  are
manufactured, processed, tested, stored or distributed.

1.11

Unity  Right  of  Inspection.  Ascentage  shall,  upon  written  request  of  Unity  with  reasonable  advance  notice,  permit
Unity’s  authorized  representative,  during  normal  working  hours,  to  inspect  (and  if  reasonably  necessary,  to  copy)  all  manufacturing  and
quality control records for all manufacture of the Products.

1.12

Quality Audit. Unity shall be entitled, during normal working hours and upon reasonable prior notice to Ascentage, to
inspect the Facility(ies), not more than once every [***], or if more frequent, at each variation of the manufacturing process for the Products.
To that effect, Ascentage shall inform Unity of any variation to the manufacturing process of the Products in accordance with the Quality
Agreement and as soon as reasonably practicable. Ascentage shall give Unity prior notice, to the extent practicable, of any inspections by the
FDA, EMA or other regulatory authority in the Territory of the Facility(ies). Upon Unity’s reasonable written request, Ascentage shall, to the
extent Ascentage has the right to do so: (a) permit a representative of Unity to be present at such inspections; (b) disclose to Unity the results
of any such inspection by the FDA, EMA or any other regulatory authority in the Territory to the extent related to the Products, but in no
event shall Ascentage be obligated to disclose the results of any such inspection to the extent relating to any other product of Ascentage or its
Affiliates and/or (c) implement any measures necessary to respond to the regulatory authorities in a satisfactory manner.

1.13

Product Warranties. Ascentage represents, warrants and covenants to Unity as follows:

Standards and meet all Specifications in all material respects,

(a)

All  Products  supplied  hereunder  shall  comply  with  all  material  and  applicable  laws  and  Manufacturing

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

5

 
and Ascentage  shall  perform  and  document  all  manufacturing,  processing,  storage  and  supply  activities  with  respect  to  Products  supplied
hereunder in compliance with all applicable laws.

with the minimum shelf-life requirements agreed upon as described in Section 1.7 of this Schedule 4.1.

(b)

All Products supplied hereunder shall, at delivery to Unity or its designee, be in compliance in all respects

The  Facility(ies),  all  equipment  used  for  the  manufacture  of  Products  within  the  Facility(ies),  and  the
activities contemplated herein will comply with all material and applicable laws and shall hold and maintain all governmental registrations,
permits, licenses and approvals necessary for it to manufacture Products for Unity under this Agreement.

(c)

(d)

Title  to  all  Products  delivered  to  Unity  under  this  Agreement  shall  pass  to  Unity  free  and  clear  of  any

security interest, lien or other encumbrance.

1.14

Suppliers.

(a)

Without limiting Ascentage’s responsibility under this Agreement, Ascentage shall have the right at any time
to satisfy its supply obligations to Unity hereunder either in whole or in part through arrangements with Third Parties engaged to perform
services  or  supply  facilities  or  goods  in  connection  with  the  manufacture,  testing,  and/or  packaging  of  Products;  provided  that  Ascentage
shall remain responsible for such activities to the same extent as if Ascentage had performed such activities itself. Ascentage shall give Unity
prior  written  notice  of  any  such  arrangement  [***]  and  such  notice  shall  be  provided  sufficiently  in  advance  to  permit  Unity  to  [***]  at
[***].

(b)

Unity shall have the right at any time during the term to qualify and register a Third Party manufacturer of
Unity’s  choosing  to  manufacture  Licensed  Compound  and/or  Licensed  Product  so  long  as  Unity  continues  to  obtain  at  least  fifty  percent
(50%) of its overall requirements (on an annualized basis) from Ascentage of Licensed Product (in the case of pre-Phase III Clinical Trials)
and Licensed Compound (in the case of Phase III Clinical Trials and commercial supply).

(c)

Within  a  reasonable  period  from  receiving  written  notice  from  Unity  informing  Ascentage  of  Unity’s
decision  to  qualify  a  Third  Party  manufacturer  to  produce  Licensed  Compound  and/or  Licensed  Products  and  after  such  Third  Party
manufacturer  has  executed  a  reasonable  and  customary  confidentiality  agreement  with  Ascentage  to  Ascentage’s  reasonable  satisfaction,
Ascentage and Unity shall implement an appropriate exchange process and schedule for the transfer to Unity or a Third Party manufacturer
of  Unity’s  choosing  of  Technology  that  is  necessary  or  useful  for  the  manufacture  of  Licensed  Compound  and  Licensed  Products
(“Manufacturing Technology”) and thereafter shall transfer such Manufacturing Technology to such Third Party manufacturer in accordance
with  the  agreed  upon  process  and  schedule.  If  after  such  initial  transfer  Unity  identifies  a  particular  item  of  Technology  pertaining  to  the
Licensed Compound and/or the manufacture thereof that is necessary or useful for the manufacture of Licensed Compound and Licensed
Products  but  has  not  been  previously  transferred  to  Unity,  Ascentage  agrees  to  use  reasonable  efforts  to  provide  the  same  to  Unity  in  a
reasonable time frame.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

6

 
(d)

In consideration for Ascentage’s providing the forgoing transfer of Manufacturing Technology with respect
to a given Product, Unity agrees to pay to Ascentage a one-time technology transfer fee. The technology transfer fee is meant to compensate
Ascentage for the [***] and will be a one-time payment of [***]. Additionally, the Parties agree that following the establishment of such
second source, the purchase price due to Ascentage  with  respect  to  quantities  of  Licensed  Compound  and/or  Licensed  Product  purchased
thereafter shall be the [***] of the [***] and the [***] (“Purchase Price Adjustment”).

(e)

Notwithstanding  the  foregoing,  if  Ascentage  either  materially  breaches  its  obligations  under  the  Supply
Agreement or does not supply Unity with Licensed Compound or Licensed Product from [***] ([***]) or more orders submitted by Unity in
accordance with Section 1.2(d) or 1.3(b) of this Exhibit 4.1 by the applicable delivery date, and in each case fails to cure such breach or
supply failure within [***] ([***]) [***] of written notice from Unity, then (i) the requirement under Section 1.14(b) that Unity obtain at
least fifty percent (50%) of its overall requirements from Ascentage of Licensed Compound and Licensed Product shall cease to apply, and
(ii) any otherwise applicable Purchase Price Adjustment shall not apply.

1.15

Shortage of Supply.

shortage of supply of Products.

(a)

Cooperation. Ascentage and Unity shall cooperate to establish reasonable plans and procedures to avoid any

(b)

Procedures. If at any time Ascentage becomes unable, or concludes that it will be unable, to supply Unity’s
requirements for the Products, Ascentage shall promptly notify Unity in writing. In such event, the Parties shall promptly convene to address
the problem, including locating alternative suppliers and facilities to increase production and identifying other actions necessary to resolve
the  problem.  Based  on  such  interactions,  the  Parties  shall  reasonably  agree  on  appropriate  measures  to  remedy  the  shortage  and  shall
promptly implement such measures. In any event, both Parties agree to respond with the level of speed and diligence commensurate with the
severity of the problem.

Ascentage shall allocate the quantities of the Product that (i) Ascentage has in inventory [***], and (ii) Ascentage is able to produce [***].

(c)

Allocation. If despite the foregoing measures Ascentage is unable to supply Unity’s requirements of Product,

1.16

Termination/Limitations of Minimum Purchase Obligations.

(a)

It  is  understood  and  agreed  that  Unity’s  obligation  to  obtain  at  least  fifty  percent  (50%)  of  its  overall
requirements  of  Licensed  Compound  and  Licensed  Product  from  Ascentage  is  expressly  conditioned  upon  Ascentage  achieving  and
maintaining [***] with respect to [***] of the manufacture of pharmaceutical products. In the event that Unity determines that it would be
preferable  to  have  one  or  more  Third  Party  manufacturers  assume  responsibility  for  the  manufacture  of  the  majority  (or  all)  of  Unity’s
requirements  of  Licensed  Compound  and  Licensed  Product  based  on  such  Third  Party  manufacturer(s)  being  [***]  with  respect  to  [***],
then  Unity  will  so  inform  Ascentage  in  writing,  explaining  to  Ascentage  the  basis  of  its  decision  and  citing  the  factor(s)  with  respect  to
which it has concluded the Third Party manufacturer is [***]. Upon Unity’s delivery to Ascentage of such written notice, the requirement
under Section 1.14(b) that

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

7

 
Unity obtain at least fifty percent (50%) of its overall requirements from Ascentage of Licensed Compound and Licensed Product shall cease
to apply. For clarity, it is understood that Unity’s determination regarding the [***] of a Third Party manufacturer with respect to [***] (i.e.,
[***]  of  the  manufacture)  shall  be  [***]  that  it  shall  [***]  to  have  one  or  more  Third  Party  manufacturers  assume  responsibility  for  the
manufacture of the majority (or all) of Unity’s requirements of Licensed Compound and Licensed Product.

(b)

It is further agreed that in the event that Unity sublicenses the commercialization of a Licensed Product to a
Third Party commercialization partner, notwithstanding anything to the contrary in this Exhibit 4.1, such commercialization partner shall be
free to manufacture its requirements of such Licensed Product (including the Licensed Compound contained therein) and that any quantities
of Licensed Product and/or Licensed Compound manufactured by or on behalf of such Third Party commercialization partner shall not be
taken into account when determining Unity’s overall requirements of Licensed Compound and Licensed Product for purposes of minimum
purchase obligation in Section 1.14(b) above.

(c)

Upon  a  Change  of  Control  of  Unity,  the  minimum  purchase  obligations  set  forth  in  Section  1.14(b)  shall
immediately terminate. As used herein, “Change of Control” means (i) the acquisition of Unity by another entity by means of any transaction
or  series  of  related  transactions  to  which  Unity  is  party  (including,  without  limitation,  any  stock  acquisition,  reorganization,  merger  or
consolidation but excluding any sale of stock for capital raising purposes) other than a transaction or series of related transactions in which
the  holders  of  the  voting  securities  of  Unity  outstanding  immediately  prior  to  such  transaction  or  series  of  related  transactions  retain,
immediately  after  such  transaction  or  series  of  related  transactions,  as  a  result  of  shares  in  Unity  held  by  such  holders  prior  to  such
transaction or series of related transactions, at least a majority of the total voting power represented by the outstanding voting securities of
Unity  or  such  other  surviving  or  resulting  entity  (or  if  Unity  or  such  other  surviving  or  resulting  entity  is  a  wholly-owned  subsidiary
immediately following such acquisition, its parent) or (ii) a sale, lease or other disposition of all or substantially all of the assets of Unity and
its  subsidiaries  taken  as  a  whole  by  means  of  any  transaction  or  series  of  related  transactions,  except  where  such  sale,  lease  or  other
disposition is to a wholly-owned subsidiary of Unity.

EXHIBIT 3.4.2 

EXECUTION COPY 
CONFIDENTIAL

DILIGENCE REQUIREMENTS
Ascentage shall use commercially reasonable efforts to develop and obtain marketing approval for each Compound that it designates as a
Development Candidate, and thereafter shall use commercially reasonable efforts to launch and commercialize each such Compound [***].

Without limiting the foregoing, Ascentage agrees that:

•

[***]; and

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

8

 
 
•

[***].

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
EXHIBIT 6.1

FORM OF STOCK ISSUANCE AGREEMENT; 
CAPITALIZATION TABLE FOR UNITY

Part A: Form of Stock Issuance Agreement

UNITY BIOTECHNOLOGY, INC. 

RESTRICTED STOCK GRANT AGREEMENT

This  Restricted  Stock  Grant  Agreement  (the  “Agreement”)  is  made  as  of  [ ● ]  by  and  between  Unity  Biotechnology,  Inc.,  a

Delaware corporation (the “Company”), and Ascentage Pharma Group Corp. Ltd. (the “Grantee”).

In consideration of the mutual covenants and representations set forth below, the Company and Grantee agree as follows:

1.

Grant of the Shares. Subject to the terms and conditions of this Agreement, the Company agrees to grant to Grantee, and
Grantee agree to acquire from the Company, on the Closing (as defined below) [●] shares of the Company’s Common Stock, $0.0001 par
value per share (the “Shares”), as consideration for services to be provided by Grantee to the Company.

2.

Closing. The transfer of the Shares shall occur at a closing (the “Closing”) to be held on the date first set forth above, or
at any other time mutually agreed upon by the Company and Grantee. The Closing will take place at the principal office of the Company or
at such other place as shall be designated by the Company. As promptly after the Closing as practicable, the Company will issue a stock
certificate, registered in the name of Grantee, reflecting the Shares.

3.

Restrictions on Transfer.

A.

Investment  Representations  and  Legend  Requirements.  The  Grantee  hereby  make  the  investment
representations listed on Exhibit A to the Company as of the date of this Agreement and as of the date of the Closing, and agrees that such
representations  are  incorporated  into  this  Agreement  by  this  reference,  such  that  the  Company  may  rely  on  them  in  issuing  the  Shares.
Grantee  understand  and  agree  that  the  Company  shall  cause  the  legends  set  forth  below,  or  substantially  equivalent  legends,  to  be  placed
upon  any  certificate(s)  evidencing  ownership  of  the  Shares,  together  with  any  other  legends  that  may  be  required  by  the  Company  or  by
applicable state or federal securities laws:

THE  SECURITIES  REPRESENTED  BY  THIS  CERTIFICATE  HAVE  NOT  BEEN
REGISTERED  UNDER  THE  SECURITIES  ACT  OF  1933,  AS  AMENDED,  OR  THE
SECURITIES LAWS OF

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
ANY  STATE,  AND  MAY  NOT  BE  SOLD,  TRANSFERRED,  ASSIGNED,  PLEDGED  OR
HYPOTHECATED  UNLESS  AND  UNTIL  REGISTERED  UNDER  SUCH  ACT  AND/OR
APPLICABLE STATE SECURITIES LAWS, OR UNLESS THE COMPANY HAS RECEIVED
AN OPINION OF COUNSEL OR OTHER EVIDENCE, REASONABLY SATISFACTORY TO
THE COMPANY AND ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED.

THE  SHARES  REPRESENTED  BY  THIS  CERTIFICATE  ARE  SUBJECT  TO  CERTAIN
RESTRICTIONS  ON  TRANSFER,  A  RIGHT  OF  FIRST  REFUSAL,  AND  A  LOCK-UP
PERIOD  IN  THE  EVENT  OF  A  PUBLIC  OFFERING  HELD  BY  THE  ISSUER  OR  ITS
ASSIGNEE(S)  AS  SET  FORTH  IN  THE  RESTRICTED  STOCK  GRANT  AGREEMENT
BETWEEN  THE  ISSUER  AND  THE  ORIGINAL  HOLDER  OF  THESE  SHARES,  A  COPY
OF  WHICH  MAY  BE  OBTAINED  AT  THE  PRINCIPAL  OFFICE  OF  THE  ISSUER.  SUCH
TRANSFER RESTRICTIONS, RIGHT OF FIRST REFUSAL AND LOCK-UP PERIOD ARE
BINDING ON TRANSFEREES OF THESE SHARES.

THE  SHARES  REPRESENTED  BY  THIS  CERTIFICATE  HAVE  NOT  BEEN  REGISTERED
UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND HAVE BEEN ACQUIRED
FOR  INVESTMENT  AND  NOT  WITH  A  VIEW  TO,  OR  IN  CONNECTION  WITH,  THE
SALE OR DISTRIBUTION THEREOF. NO TRANSFER MAY BE EFFECTED WITHOUT AN
EFFECTIVE  REGISTRATION  STATEMENT  RELATED  THERETO  OR  AN  OPINION  OF
COUNSEL IN A FORM REASONABLY SATISFACTORY TO THE COMPANY THAT SUCH
REGISTRATION  IS  NOT  REQUIRED  UNDER  THE  SECURITIES  ACT  OF  1933,  AS
AMENDED.

Stop-Transfer Notices.  Grantee  agree  that  to  ensure  compliance  with  the  restrictions  referred  to  herein,  the
Company may issue appropriate “stop transfer” instructions to its transfer agent, if any, and that, if the Company transfers its own securities,
it may make appropriate notations to the same effect in its own records.

B.

Refusal to Transfer. The Company shall not be required (i) to transfer on its books any Shares that have been
sold or otherwise transferred in violation of any of the provisions of this Agreement or (ii) to treat as owner of such Shares or to accord the
right to vote or pay dividends to any acquirer or other transferee to whom such Shares shall have been so transferred.

C.

Lock-Up Period.  Grantee  hereby  agree  that  Grantee  shall  not  sell,  offer,  pledge,  contract  to  sell,  grant  any
option or contract to purchase, purchase any option or contract to sell, grant any right or warrant to purchase, lend or otherwise transfer or
encumber, directly or indirectly, any Shares or other securities of the Company, nor shall Grantee enter into any swap,

D.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

2

 
hedging or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of any Shares or
other securities of the Company, during the period from the filing of the first registration statement of the Company filed under the Securities
Act of 1933, as amended (the “Securities Act”), that includes securities to be sold on behalf of the Company to the public in an underwritten
public offering under the Securities Act through the end of the 180-day period following the effective date of such registration statement (or
such other period as may be requested by the Company or the underwriters to accommodate regulatory restrictions on (i) the publication or
other distribution of research reports and (ii) analyst recommendations and opinions, including, but not limited to, the restrictions contained
in NASD Rule 2711(f)(4) or NYSE Rule 472(f)(4), or any successor provisions or amendments thereto). The obligations described in this
section  shall  not  apply  to  a  registration  relating  solely  to  employee  benefit  plans  on  Form  S-1  or  Form  S-8  or  similar  forms  that  may  be
promulgated  in  the  future,  or  a  registration  relating  solely  to  a  transaction  on  Form  S-4  or  similar  forms  that  may  be  promulgated  in  the
future.  Grantee  further  agree,  if  so  requested  by  the  Company  or  any  representative  of  its  underwriters,  to  enter  into  such  underwriter’s
standard form of “lockup” or “market standoff” agreement in a form satisfactory to the Company and such underwriter. The Company may
impose stop-transfer instructions with respect to securities subject to the foregoing restrictions until the end of any such restriction period.

4.

Company’s  Right  of  First  Refusal.  Before  any  Shares  acquired  by  the  Grantee  pursuant  to  this  Agreement  (or  any
beneficial interest in such Shares) may be sold, transferred, encumbered or otherwise disposed of in any way (whether by operation of law or
otherwise) by the Grantee or any subsequent transferee (each a “Holder”), such Holder must first offer such Shares or beneficial interest to
the Company and/or its assignee(s) as follows:

A.

Notice  of  Proposed  Transfer.  The  Holder  shall  deliver  to  the  Company  a  written  notice  stating:  (i)  the
Holder’s bona fide intention to sell or otherwise transfer the Shares; (ii) the name of each proposed transferee; (iii) the number of Shares to
be transferred to each proposed transferee; (iv) the bona fide cash price or other consideration for which the Holder proposes to transfer the
Shares; and (v) that by delivering the notice, the Holder offers all such Shares to the Company and/or its assignee(s) pursuant to this section
and on the same terms described in the notice.

Exercise  of  Right  of  First  Refusal.  At  any  time  within  30  days  after  receipt  of  the  Holder’s  notice,  the
Company and/or its assignee(s) may, by giving written notice to the Holder, elect to purchase all, but not less than all, of the Shares proposed
to be transferred to any one or more of the proposed transferees, at the purchase price determined in accordance with Section 4.C.

B.

Purchase Price.  The  purchase  price  for  the  Shares  purchased  by  the  Company  and/or  its  assignee(s)  under
this section shall be the price listed in the Holder’s notice. If the price listed in the Holder’s notice includes consideration other than cash, the
cash equivalent value of the non-cash consideration shall be determined by the Board of Directors of the Company in its sole discretion.

C.

in cash (by check), by cancellation of all or a portion of any

D.

Payment. Payment of the purchase price shall be made, at the option of the Company and/or its assignee(s),

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

3

 
outstanding indebtedness of the Holder to the Company and/or its assignee(s), or by any combination thereof within 30 days after receipt by
the Company of the Holder’s notice (or at such later date as is called for by such notice).

E.

Holder’s Right to Transfer. If all of the Shares proposed in the notice to be transferred to a given proposed
transferee are not purchased by the Company and/or its assignee(s) as provided in this section, then the Holder may sell or otherwise transfer
such Shares to that proposed transferee; provided that: (i) the transfer is made only on the terms provided for in the notice, with the exception
of the purchase price, which may be either the price listed in the notice or any higher price; (ii) such transfer is consummated within 60 days
after the date the notice is delivered to the Company; (iii) the transfer is effected in accordance with any applicable securities laws, and if
requested  by  the  Company,  the  Holder  shall  have  delivered  an  opinion  of  counsel  acceptable  to  the  Company  to  that  effect;  and  (iv)  the
proposed  transferee  agrees  in  writing  to  receive  and  hold  the  Shares  so  transferred  subject  to  all  of  the  provisions  of  this  Agreement,
including but not limited to this section, and there shall be no further transfer of such Shares except in accordance with the terms of this
section. If any Shares described in a notice are not transferred to the proposed transferee within the period provided above, then before any
such Shares may be transferred, a new notice shall be given to the Company, and the Company and/or its assignees shall again be offered the
right of first refusal described in this section.

F.

Exception for Certain Family Transfers. Notwithstanding anything to the contrary contained elsewhere in this
section, the transfer of any or all of the Shares during the Holder’s lifetime or on the Holder’s death by will or intestacy to (i) the Holder’s
spouse;  (ii)  the  Holder’s  lineal  descendants  or  antecedents,  siblings,  aunts,  uncles,  cousins,  nieces  and  nephews  (including  adoptive
relationships and step relationships), and their spouses; (iii) the lineal descendants or antecedents, siblings, cousins, aunts, uncles, nieces and
nephews  of  Holder’s  spouse  (including  adoptive  relationships  and  step  relationships),  and  their  spouses;  and  (iv)  a  trust  or  other  similar
estate planning vehicle for the benefit of the Holder or any such person, shall be exempt from the provisions of this section; provided that, in
each  such  case,  the  transferee  agrees  in  writing  to  receive  and  hold  the  Shares  so  transferred  subject  to  all  of  the  provisions  of  this
Agreement, including but not limited to this section, and there shall be no further transfer of such Shares except in accordance with the terms
of this section; and provided further, that without the prior written consent of the Company, which may be withheld in the sole discretion of
the Company, no more than three transfers may be made pursuant to this section, including all transfers by the Holder and all transfers by
any transferee.

G.

Termination of Right of First Refusal. The right of first refusal contained in this section shall terminate as to
all Shares acquired hereunder upon the earlier of: (i) the closing date of the first sale of Common Stock of the Company to the general public
pursuant to a registration statement filed with and declared effective by the Securities and Exchange Commission under the Securities Act,
and (ii) the closing date of a Change of Control pursuant to which the holders of the outstanding voting securities of the Company receive
securities of a class registered pursuant to Section 12 of the Securities Exchange Act of 1934, as amended. For purposes of this Agreement, a
“Change of Control” means either: (i) the acquisition of the Company by another entity by means of any transaction or series of related
transactions (including, without limitation, any reorganization, merger or consolidation or stock transfer, but excluding any such transaction
effected primarily for the purpose of changing the domicile of the Company),

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

4

 
unless the Company’s stockholders of record immediately prior to such transaction or series of related transactions hold, immediately after
such transaction or series of related transactions, at least 50% of the voting power of the surviving or acquiring entity (provided that the sale
by the Company of its securities for the purposes of raising additional funds shall not constitute a Change of Control hereunder); or (ii) a sale
of all or substantially all of the assets of the Company.

5.

General Provisions.

rules, of the State of California.

A.

Choice of Law. This Agreement shall be governed by the internal substantive laws, but not the choice of law

B.

Integration.  This  Agreement,  including  all  exhibits  hereto,  represents  the  entire  agreement  between  the
parties with respect to the acquisition of the Shares by the Grantee and supersedes and replaces any and all prior written or oral agreements
regarding  the  subject  matter  of  this  Agreement  including,  but  not  limited  to,  any  representations  made  during  any  interviews,  relocation
discussions or negotiations whether written or oral.

C.

Notices.  Any  notice,  demand,  offer,  request  or  other  communication  required  or  permitted  to  be  given  by
either the Company or the Grantee pursuant to the terms of this Agreement shall be in writing and shall be deemed effectively given the
earlier  of  (i)  when  received,  (ii)  when  delivered  personally,  (iii)  one  business  day  after  being  delivered  by  facsimile  (with  receipt  of
appropriate confirmation), (iv) one business day after being deposited with an overnight courier service or (v) four days after being deposited
in the U.S. mail, First Class with postage prepaid and return receipt requested, and addressed to the parties at the addresses provided to the
Company (which the Company agrees to disclose to the other parties upon request) or such other address as a party may request by notifying
the other in writing.

D.

Successors.  Any  successor  to  the  Company  (whether  direct  or  indirect  and  whether  by  purchase,  merger,
consolidation, liquidation or otherwise) to all or substantially all of the Company’s business and/or assets shall assume the obligations under
this  Agreement  and  agree  expressly  to  perform  the  obligations  under  this  Agreement  in  the  same  manner  and  to  the  same  extent  as  the
Company would be required to perform such obligations in the absence of a succession. For all purposes under this Agreement, the term
“Company”  shall  include  any  successor  to  the  Company’s  business  and/or  assets  which  executes  and  delivers  the  assumption  agreement
described in this section or which becomes bound by the terms of this Agreement by operation of law. Subject to the restrictions on transfer
set forth in this Agreement, this Agreement shall be binding upon Grantee and their heirs, executors, administrators, successors and assigns.

E.

Assignment; Transfers. Except as set forth in this Agreement, this Agreement, and any and all rights, duties
and obligations hereunder, shall not be assigned, transferred, delegated or sublicensed by the Grantee without the prior written consent of the
Company. Any attempt by the Grantee without such consent to assign, transfer, delegate or sublicense any rights, duties or obligations that
arise under this Agreement shall be void. Except as set forth in this Agreement, any transfers in violation of any restriction upon transfer
contained in any section of this Agreement shall be void, unless such restriction is waived in accordance with the terms of this Agreement.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

5

 
Waiver. Either party’s failure to enforce any provision of this Agreement shall not in any way be construed as
a waiver of any such provision, nor prevent that party from thereafter enforcing any other provision of this Agreement. The rights granted
both parties hereunder are cumulative and shall not constitute a waiver of either party’s right to assert any other legal remedy available to it.

F.

Grantee Investment Representations and Further Documents. The Grantee agree upon request to execute any
further documents or instruments necessary or reasonably desirable in the view of the Company to carry out the purposes or intent of this
Agreement, including (but not limited to) the applicable exhibits and attachments to this Agreement.

G.

provisions shall nevertheless remain effective and shall remain enforceable to the greatest extent permitted by law.

H.

Severability.  Should  any  provision  of  this  Agreement  be  found  to  be  illegal  or  unenforceable,  the  other

I.

Rights as Stockholder.  Subject  to  the  terms  and  conditions  of  this  Agreement,  Grantee  shall  have  all  of  the
rights of a stockholder of the Company with respect to the Shares from and after the date that Grantee deliver a fully executed copy of this
Agreement (including the applicable exhibits and attachments to this Agreement) and full payment for the Shares to the Company, and until
such time as Grantee dispose of the Shares in accordance with this Agreement. Upon such transfer, Grantee shall have no further rights as a
holder of the Shares so purchased except (in the case of a transfer to the Company) the right to receive payment for the Shares so purchased
in accordance with the provisions of this Agreement, and Grantee shall forthwith cause the certificate(s) evidencing the Shares so purchased
to be surrendered to the Company for transfer or cancellation.

Adjustment for Stock Split. All references to the number of Shares and the purchase price of the Shares in this
Agreement shall be adjusted to reflect any stock split, stock dividend or other change in the Shares which may be made after the date of this
Agreement.

J.

K.

Reliance  on  Counsel  and  Advisors.  Grantee  acknowledge  that  Wilson  Sonsini  Goodrich  &  Rosati,
Professional Corporation, is representing only the Company in this transaction. Grantee acknowledges that he or she has had the opportunity
to review this Agreement, including all attachments hereto, and the transactions contemplated by this Agreement with his or her own legal
counsel, tax advisors and other advisors. Grantee are relying solely on his or her own counsel and advisors and not on any statements or
representations of the Company or its agents for legal or other advice with respect to this investment or the transactions contemplated by this
Agreement.

Counterparts. This Agreement may be executed in one or more counterparts, each of which will be deemed
an original, but all of which together will constitute one and the same agreement. Facsimile copies of signed signature pages shall be binding
originals.

L.

(Signature page follows)

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

6

 
 
The parties represent that they have read this Agreement in its entirety, have had an opportunity to obtain the advice of counsel

prior to executing this Agreement and fully understand this Agreement.

COMPANY:

UNITY BIOTECHNOLOGY, INC.

By:
Name:

Dr. Nathaniel E. David 
Title:President and Chief Executive Officer

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

[Signature Page to Restricted Stock Grant Agreement]

 
 
 
 
The parties represent  that  they  have  read  this  Agreement  in  its  entirety,  have  had  an  opportunity  to  obtain  the  advice  of  counsel  prior  to
executing  this  Agreement  and  fully  understand  this  Agreement.  The  Grantee  agrees  to  notify  the  Company  of  any  change  in  its  address
below.

GRANTEE:

ASCENTAGE PHARMA GROUP CORP. LTD.

Title:

Name:
Title:

Address:

11/F, AXA Centre 
Gloucester Road, 
Wanchai Hong Kong

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

[Signature Page to Restricted Stock Grant Agreement]

 
 
 
 
 
EXHIBIT A
INVESTMENT REPRESENTATION STATEMENT

GRANTEE

COMPANY

SECURITY

AMOUNT

DATE

:

:

:

:

:

ASCENTAGE PHARMA GROUP CORP. LTD.

UNITY BIOTECHNOLOGY, INC.

COMMON STOCK

[●] SHARES

[●]

In connection with the acquisition of the above-listed shares, I, each of the undersigned, represent to the Company as follows:

1.

The Company may rely on these representations. I understand that the Company’s sale of the shares to me has not been
registered  under  the  Securities  Act  of  1933,  as  amended  (the  “Securities  Act”),  because  the  Company  believes,  relying  in  part  on  my
representations  in  this  document,  that  an  exemption  from  such  registration  requirement  is  available  for  such  sale.  I  understand  that  the
availability of this exemption depends upon the representations I am making to the Company in this document being true and correct.

2.

I  am  purchasing  for  investment.  I  am  purchasing  the  shares  solely  for  investment  purposes,  and  not  for  further
distribution. My entire legal and beneficial ownership interest in the shares is being acquired and shall be held solely for my account, except
to the extent I intend to hold the shares jointly with my spouse. I am not a party to, and do not presently intend to enter into, any contract or
other arrangement with any other person or entity involving the resale, transfer, grant of participation with respect to or other distribution of
any  of  the  shares.  My  investment  intent  is  not  limited  to  my  present  intention  to  hold  the  shares  for  the  minimum  capital  gains  period
specified under any applicable tax law, for a deferred sale, for a specified increase or decrease in the market price of the shares, or for any
other fixed period in the future.

3.

I  can  protect  my  own  interests.  I  can  properly  evaluate  the  merits  and  risks  of  an  investment  in  the  shares  and  can
protect my own interests in this regard, whether by reason of my own business and financial expertise, the business and financial expertise of
certain professional advisors unaffiliated with the Company with whom I have consulted, or my preexisting business or personal relationship
with the Company or any of its officers, directors or controlling persons.

4.

I am informed about the Company. I am sufficiently aware of the Company’s business affairs and financial condition to
reach an informed and knowledgeable decision to acquire the shares. I have had opportunity to discuss the plans, operations and financial
condition

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
of the Company with its officers, directors or controlling persons, and have received all information I deem appropriate for assessing the risk
of an investment in the shares.

5.

I recognize my economic risk. I  realize  that  the  acquisition  of  the  shares  involves  a  high  degree  of  risk,  and  that  the
Company’s future prospects are uncertain. I am able to hold the shares indefinitely if required, and am able to bear the loss of my entire
investment in the shares.

6.

I  know  that  the  shares  are  restricted  securities.  I  understand  that  the  shares  are  “restricted  securities”  in  that  the
Company’s sale of the shares to me has not been registered under the Securities Act in reliance upon an exemption for non-public offerings.
In this regard, I also understand and agree that:

Securities Act, or unless an exemption from registration is otherwise available (such as Rule 144);

A.

I  must  hold  the  shares  indefinitely,  unless  any  subsequent  proposed  resale  by  me  is  registered  under  the

B.

C.

the Company is under no obligation to register any subsequent proposed resale of the shares by me; and

the certificate evidencing the shares will be imprinted with a legend which prohibits the transfer of the shares

unless such transfer is registered or such registration is not required in the opinion of counsel for the Company.

7.

I  am  familiar  with  Rule  144.  I  am  familiar  with  Rule  144  adopted  under  the  Securities  Act,  which  in  some
circumstances  permits  limited  public  resales  of  “restricted  securities”  like  the  shares  acquired  from  an  issuer  in  a  non-public  offering.  I
understand that my ability to sell the shares under Rule 144 in the future is uncertain, and may depend upon, among other things: (i) the
availability  of  certain  current  public  information  about  the  Company;  (ii)  the  resale  occurring  more  than  a  specified  period  after  my
acquisition and full payment (within the meaning of Rule 144) for the shares; and (iii) if I am an affiliate of the Company (A) the sale being
made in an unsolicited “broker’s transaction”, transactions directly with a market maker or riskless principal transactions, as those terms are
defined  under  the  Securities  Exchange  Act  of  1934,  as  amended,  (B)  the  amount  of  shares  being  sold  during  any  three-month  period  not
exceeding the specified limitations stated in Rule 144, and (C) timely filing of a notice of proposed sale on Form 144, if applicable.

8.

I know that Rule 144 may never be available. I understand that the requirements of Rule 144 may never be met, and
that the shares may never be saleable under the rule. I further understand that at the time I wish to sell the shares, there may be no public
market for the Company’s stock upon which to make such a sale, or the current public information requirements of Rule 144 may not be
satisfied, either of which may preclude me from selling the shares under Rule 144 even if the relevant holding period had been satisfied.

9.

I know that I am subject to further restrictions on resale. I understand that in the event Rule 144 is not available to me,
any future proposed sale of any of the shares by me will not be possible without prior registration under the Securities Act, compliance with
some  other  registration  exemption  (which  may  or  may  not  be  available),  or  each of  the  following:  (i)  my  written  notice  to  the  Company
containing detailed information regarding the proposed sale, (ii)

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
my providing an opinion of my counsel to the effect that such sale will not require registration, and (iii) the Company notifying me in writing
that  its  counsel  concurs  in  such  opinion.  I  understand  that  neither  the  Company  nor  its  counsel  is  obligated  to  provide  me  with  any  such
opinion. I understand that although Rule 144 is not exclusive, the Staff of the SEC has stated that persons proposing to sell private placement
securities other than in a registered offering or pursuant to Rule 144 will have a substantial burden of proof in establishing that an exemption
from registration is available for such offers or sales, and that such persons and their respective brokers who participate in such transactions
do so at their own risk.

10.

I know that I may have tax liability due to the uncertain value of the shares. I understand that the Board of Directors
believes its valuation of the shares represents a fair appraisal of their worth, but that it remains possible that, with the benefit of hindsight, the
Internal Revenue Service may successfully assert that the value of the shares on the date of my acquisition is substantially greater than the
Board’s appraisal. I understand that any additional value ascribed to the shares by such an IRS determination will constitute ordinary income
to me as of the acquisition date, and that any additional taxes and interest due as a result will be my sole responsibility payable only by me,
and that the Company need not and will not reimburse me for that tax liability.

11.

Non-U.S. Investor. If I am not a United States person, I hereby represents that I am satisfied as to the full observance of
the laws of my jurisdiction in connection with any invitation to receive the shares issuable pursuant to this Agreement, or any use of this
Agreement, including (i) the legal requirements within my jurisdiction for the acquisition of the shares pursuant to this Agreement, (ii) any
foreign exchange restrictions applicable to such receipt or transfer, (iii) any governmental or other consents that may need to be obtained and
(iv) the income tax and other tax consequences, if any, that may be relevant to the acquisition, holding, redemption, sale or transfer of such
securities. My subscription for, and my continued beneficial ownership of the shares will not violate any applicable securities or other laws
of my jurisdiction.

12.

Principal Place of Business. The address of my principal place of business is set forth on the signature page below.

By  signing  below,  the  undersigned  acknowledge  their  agreement  with  each  of  the  statements  contained  in  this  Investment
Representation Statement as of the date first set forth above, and their intent for the Company to rely on such statements in issuing the shares
to me.

ASCENTAGE PHARMA GROUP CORP. LTD.

Address of Grantee’ Principal Place of Business:

11/F AXA Centre 
Gloucester Road, 
Wanchai Hong Kong

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
Part B: Capitalization Table

[***]

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
APG1252 License Agreement

Exhibit 10.15

This APG1252 License Agreement (the “Agreement”) effective as of the 2nd day of Feburary, 2016, (the “Signing Date”) is made
by  and  between  Ascentage Pharma Group Corp. Ltd.,  a  Hong  Kong  corporation  (“Ascentage”),  with  a  business  address  at  11/F,  AXA
CENTRE,  Gloucester  Road,  Wanchai,  Hong  Kong,  and  Unity  Biotechnology,  Inc.,  a  Delaware  corporation  (“Unity”),  with  a  business
address at 1700 Owens Street, Suite 535, San Francisco, California 95158.  Each of Ascentage and Unity shall be a “Party,” and both the
“Parties.”

BACKGROUND

A.

Unity  and  Ascentage  entered  into  that  certain  Compound  Library  and  Option  Agreement  of  even  date  herewith  (the
“Library Agreement”), pursuant to which Ascentage has granted to Unity the right to screen Ascentage’s existing collection of BCL-2/BCL-
xL  inhibitor  compounds  as  well  as  any  additional  BCL-2/BCL-xL  inhibitor  compounds  discovered  by  Ascentage  during  the  term  of  the
Library Agreement, in each case to identify compounds with potential utility in the treatment of age-related conditions other than Oncology
Indications; and

B.

Ascentage has begun developing a BCL-2/BCL-xL inhibitor known as APG-1252 (as further defined below) and owns

or controls certain patents, know-how and other intellectual property relating to APG-1252.

C.

Unity desires to acquire from Ascentage a license under the Licensed Intellectual Property to develop APG-1252 in the
Field and Territory (each as defined below), and Ascentage is willing to grant Unity such license on the terms and conditions herein, all as
set forth below.

NOW, THEREFORE, for and in consideration of the covenants, conditions, and undertakings hereinafter set forth, it is agreed by

and between the Parties as follows:

1.1

The following terms have the meanings set forth in the Library Agreement:

ARTICLE 1

DEFINITIONS

Affiliate
Ascentage Intellectual Property
Collaboration Period
Compounds
Compound License Agreement(s)
Greater China
IND
Oncology Indications
Patents
Technology
Third Party
Unity Bcl-2 [***] Product

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
1.2

“APG-1252” means the chemical compound with the structure identified in Schedule 1.2, [***].

1.3

“APG-1252 Work-a-Like Product” means a Licensed Product under a Compound License Agreement, which product is
[***] and is subject to the milestones and royalties described as [***] in Sections 5.2 (Development/Sales Milestones) and 5.3 (Royalties) of
the Form of Compound License Agreement attached as Exhibit 3.3.2(a) of the Library Agreement.  

1.4

“Fair Market Value” means with respect to a share of Unity common stock, the average price that Unity common stock
is publicly trading at for [***] ([***]) days prior to the date in question, or, if the security is not publicly traded, the value of such stock as
determined  in  good  faith  by  Unity’s  board  of  directors  in  reliance  upon  Unity’s  most  recent  IRC  Section  409A  independent  valuation  of
Unity’s common stock that it used for the purposes of granting stock options to its employees.

1.5

“Control”  and  its  correlative  terms,  “Controlled”  or  “Controls”  shall  mean,  with  respect  to  any  Patent  or  item  of
Technology, that a Party or one of its Affiliates owns or possesses rights to such Patent or item of Technology sufficient to grant the access,
license  or  sublicense  contemplated  in  this  Agreement  without  violating  the  terms  of  any  agreement  or  other  arrangement  with  any  Third
Party.

1.6

“Cover” and its correlative terms, “Covers”, “Covered” or “Covering” means (a) with respect to an issued patent, that,
in the absence of a license, the use, offer for sale, sale, importation or manufacture of the product in question would infringe one or more
claims  of  such  patent  or  (b)  with  respect  to  a  pending  patent  application,  that,  in  the  absence  of  a  license,  the  use,  offer  for  sale,  sale,
importation or manufacture of the product in question would infringe one or more claims of such patent application, should such claims issue
as published.

1.7

“Effective Date” shall mean the date on which the Second Amendment takes effect.

1.8

“Enabling IP” means Patents and/or Technology of a Third Party that Covers or relates to a Royalty-bearing Product
and  is  necessary  or  useful  for  the  research,  development,  manufacture,  use,  sale  or  import  of  Royalty-bearing  Products,  including  Patents
directed to the composition and manufacture of Licensed Compound, but excluding Patents related to formulation and therapeutic methods.

1.9

“EMA” means the European Medicines Agency and any successor agency.

1.10

“Existing Agreements” means (a) that certain Exclusive License Agreement between Unity and the Mayo Foundation
for  Medical  Education  and  Research  originally  entered  into  by  the  parties  effective  June  28th,  2013;  (b)  that  certain  Exclusive  License
Agreement between Unity and the Buck Institute for Research on Aging originally entered into by the parties effective February 3rd, 2014;
and (c) that certain Exclusive License Agreement between Unity and the Board of Trustees of the University of Arkansas originally entered
into by the parties effective April 28th, 2015.

1.11

“FDA” means the United States Food and Drug Administration and any successor agency.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

2

 
1.12

 “Field” means the prophylaxis and treatment of, and palliation of symptoms associated with, indications other than

Oncology Indications.

1.13

“Generic Product” means a product which (a) contains as its active pharmaceutical ingredient a compound that is (or
is substantially the same as) the Licensed Compound or the active pharmaceutical contained in a Unity Bcl-2 [***] Product, and (b) has been
placed on the market pursuant to a validly granted marketing authorization.

1.14

1.15

1.16

“Licensed Compound” means APG-1252.  

“Licensed Intellectual Property” means the Licensed Patents and Licensed Technology.

“Licensed Patents” means Patents owned or Controlled by Ascentage or its Affiliates during the Term, in each case to

the extent Covering the Licensed Compound, a Licensed Product or a Unity Bcl-2 [***] Product.

1.17

“Licensed Product” means a pharmaceutical product containing the Licensed Compound (either alone or with other

active pharmaceutical ingredients), in all forms, presentations, formulation and dosage forms.  

1.18

“Licensed  Technology”  means  Technology  owned  or  Controlled  by  Ascentage  or  its  Affiliates  during  the  Term,  in
each  case  to  the  extent  such  Technology  is  necessary  or  reasonably  useful  for  the  development,  manufacture  or  commercialization  of  the
Licensed Compound, a Licensed Product or a Unity Bcl-2 [***] Product.

1.19

 “Marketing Approval Application” or “MAA” means a New Drug Application (or its equivalent), as defined in the
U.S. Food, Drug and Cosmetic Act and the regulations promulgated thereunder, or any corresponding or similar application, registration or
certification in any country.

1.20

“Net Sales” means the gross amount invoiced to non-Affiliate Third Parties on sales of Royalty-bearing Products by
Unity  or  its  Affiliates  or  Third  Party  Sublicensees,  less  the  actual  amounts  incurred,  allowed,  or  paid  for  the  following  items  (if  not
previously  deducted  from  the  amount  invoiced  and  provided  that  such  deductions  are  calculated  in  accordance  with  generally  accepted
accounting principles of the United States of America (“GAAP”) on a consistent basis): (a) trade, cash, and quantity discounts; (b) amounts
for  claims,  allowances  or  credits  for  returns,  rejections  or  recalls;  (c)  freight,  shipping  and  insurance  charges  allocable  to  such  Royalty-
bearing Products; (d) sales taxes, duties and other governmental charges (including value added tax) on particular sales, but excluding what
is commonly known as income taxes; (e) government mandated rebates; (f) contracted rebates; and (g) a provision for uncollectible accounts;
in each case as determined from books and records of the selling party maintained in accordance with GAAP, as consistently applied by such
selling party.  In the event that Unity grants a sublicense to a Third Party Sublicensee hereunder, and receives payments based upon such
Third Party Sublicensee's sales of Royalty-bearing Product, Unity may, with Ascentage’s consent, which consent shall not be unreasonably
withheld or delayed, substitute the definition of "Net Sales," used by such Third Party Sublicensee to calculate its payments to Unity in place
of the foregoing definition of "Net Sales" for purposes of calculating royalties payable to Ascentage on such Third

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

3

 
Party Sublicensee's sales.

1.21

 “Phase I Clinical Trial” means a human clinical trial, the principal purpose of which is preliminary determination of

safety of a drug in healthy individuals or patients, that would satisfy the requirements of 21 C.F.R. §312.21(a).

1.22

“Phase II Clinical Trial” means a clinical trial of a drug conducted on a limited number of patients for the purpose of
preliminary evaluation of clinical efficacy and safety of such drug, and/or to obtain an indication of the dosage regimen required, in each
case that would satisfy the requirements of 21 C.F.R. 312.21(b).

1.23

“Phase III Clinical Trial” means a pivotal human clinical trial intended to gather additional information regarding the
safety and efficacy of the drug in patients with the disease being studied, which clinical study is designed to be of a size and statistical power
sufficient to support the filing of an MAA and that would satisfy the requirements of 21 C.F.R. 312.21(c).

1.24

1.25

“Royalty-bearing Product” means a Licensed Product or a Unity Bcl-2 [***] Product.

“Royalty-bearing  Product-Specific  Patents”  means  those  Licensed  Patents  that  [***]  the  Licensed  Compound,  a

Licensed Product or a Unity Bcl-2 [***] Product and [***].

1.26

“Territory” means the entire world excluding Greater China.

1.27

“Third Party Sublicensee”  means  any  Third  Party  to  which  Unity  licenses  the  right  to  commercialize  any  Royalty-
bearing Product.  For the avoidance of doubt, “Third Party Sublicensee” shall not include Third Party distributors, service providers, vendors
and suppliers that do not have the right to market or promote the Royalty-bearing Product.

1.28

“UM  License  Agreement”  means  that  certain  license  agreement  entered  into  by  Ascentage  and  the  Regents  of  the
University of Michigan (“UM”) effective as of December 1, 2010, as amended by all amendments to such license agreement existing as of
the Effective Date.

1.29

“Unity  Bcl-2  [***]  Product”  means  any  [***]  product  for  [***],  wherein  the  [***],  and  in  each  case  that  (a)  is
developed by Unity during the Collaboration Period, (b) is not an APG-1252 Work-a-Like Product, and (c) for which an IND is filed prior to
the  later  of  the  [***]  anniversary  of  the  Effective  Date  or  the  [***]  anniversary  of  the  expiration  or  termination  of  the  Library
Agreement.    Notwithstanding  anything  to  the  contrary  in  this  Agreement,  any  compound  that  was  designed  ([***])  or  [***]  synthesized
[***] shall not be considered a Unity Bcl-2 [***] Product without Unity’s express written consent.  [***]  In addition, Unity agrees that upon
request it will [***].  

1.30

“Valid Claim” means a claim contained in an issued Patent within the Licensed Patents in any country that (a) has not
expired; (b) has not been disclaimed; (c) has not been cancelled or superseded, or if cancelled or superseded, has been reinstated; and (d) has
not  been  revoked,  held  invalid,  or  otherwise  declared  unenforceable  or  not  allowable  by  a  tribunal  or  patent  authority  of  competent
jurisdiction over such claim in such country from which no further appeal has or may be taken.  

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

4

 
2.1

Licenses.

ARTICLE 2

LICENSES

2.1.1

Development Licenses.  Subject to the terms and conditions of this Agreement, Ascentage hereby grants to
Unity a royalty-free, exclusive license in the Field and Territory, with the right to grant sublicenses as provided in Section 2.2, under the
Licensed Intellectual Property to (a) research, develop and seek and obtain marketing approval for the Licensed Compound and Licensed
Products using Licensed Compound and/or Licensed Products supplied by or on behalf of Ascentage and (b) research, make, develop and
seek and obtain marketing approval for Unity Bcl-2 [***] Products; in each case solely in the Field and Territory, and to have any of the
foregoing performed on its behalf by a Third Party; and

2.1.2

Commercialization Licenses.    Subject  to  the  terms  and  conditions  of  this  Agreement,  Ascentage  hereby
grants to Unity a royalty-bearing, exclusive license in the Field and Territory, with the right to grant sublicenses as provided in Section 2.2,
under the Licensed Intellectual Property: (a) to use the Licensed Compound supplied by or on behalf of Ascentage to make or have made the
Licensed Products; (b) to use, offer for sale, sell, import, export, market, promote and distribute Licensed Compound and Licensed Products,
and (c) to make, use, offer for sale, sell, import, export, market, promote and distribute Unity Bcl-2 [***] Products; in each case, solely for
use in the Field and Territory, and to have any of the foregoing performed on its behalf by a Third Party.  It is understood and agreed that the
licenses set forth in this Section 2.1.2 exclude the right to make or have made the Licensed Compound.

2.2

Sublicenses.  Unity may grant and authorize sublicenses within the scope of the license granted to Unity pursuant to
this Agreement, provided that for clarity, Unity shall remain responsible for all milestone and other payments due to Ascentage under this
Agreement based on the activities of Unity’s sublicensees.

2.3

Third Party Intellectual Property.  If after the Effective Date, Ascentage acquires or licenses from a Third Party subject
matter that would fall within the Licensed Intellectual Property (“Third Party Intellectual Property”) that is subject to any payment obligation
to the Third Party, then Ascentage shall so notify Unity and Unity shall inform Ascentage if it wishes such subject matter to be included
within  the  Licensed  Intellectual  Property.    If  Unity  notifies  Ascentage  that  it  does  wish  such  subject  matter  to  be  so  included,  the  rights
granted to Unity hereunder with respect to such Third Party Intellectual Property shall be subject to Unity promptly reimbursing Ascentage
for [***] and Unity shall reimburse Ascentage for [***].  Upon request by Unity, Ascentage shall disclose to Unity a written description of
such payment obligations.  Notwithstanding the foregoing, Unity shall have the right to treat amounts paid to Ascentage as reimbursements
for payments for Enabling IP for purposes of Section 5.5.

2.4

No Implied Licenses.  Nothing herein shall be construed as granting Unity, by implication, estoppel or otherwise, any
license  or  other  right  (a)  to  any  intellectual  property  of  Ascentage  other  than  the  Licensed  Intellectual  Property  (b)  to  commercialize
Licensed Products outside of the Field and Territory (c) not relating to the Licensed Compound, Licensed Products and Unity Bcl-2 [***]
Products or (d) any right or license other than those expressly granted herein.    

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

5

 
2.5

2.6

[***].

Exclusivity/[***].  

2.6.1

Exclusivity.  

(a)

No  Development  or  Commercialization  of  Licensed  Compound  in  the  Field.   Ascentage  hereby
covenants  that  except  as  expressly  permitted  under  any  future  agreement  that  the  Parties  may  enter  into  pursuant  to  Article  8  below
pertaining to the China JVCO, Ascentage shall not: (a) research, develop, use or commercialize, and shall not authorize any Affiliate or other
Third Party to research, develop, use or commercialize, the Licensed Compound (or any Licensed Product) in the Field, and (b) manufacture,
or authorize any Third Party to manufacture, the Licensed Compound or any Licensed Product for use in the Field, other than for supply to
Unity in accordance with the terms of the Supply Agreement to be negotiated pursuant to Article 4 below.

No  Development  or  Commercialization  of  Licensed  Compounds.   Ascentage  hereby  covenants
that except as expressly permitted under any future agreement that the Parties may enter into pursuant to Article 8 below pertaining to the
China JVCO, Ascentage shall not research, develop, manufacture, use or commercialize, and shall not authorize any Affiliate or other Third
Party to research, develop, manufacture, use or commercialize, any Unity Bcl-2 [***] Products.

(b)

containing the Licensed Compound for Oncology Indications independently.

(c)

Notwithstanding anything to the contrary, Ascentage shall be permitted to develop any products

[***] to [***]. The [***] is [***].  In addition, the [***] to [***].  Ascentage will appoint [***] and Unity will appoint [***] to [***].

2.6.2

[***]  Licensed  Products.    Within  [***]  of  the  effective  date  of  the  Library  Agreement  the  Parties  will

2.7

[***].  The Parties agree that within [***] of the Effective Date of this Agreement they will put in place a procedure

pursuant to which [***] shall [***] that [***] to [***].

ARTICLE 3
DUE DILIGENCE

3.1

General.    Unity  shall  use  commercially  reasonable  efforts  to  develop  and  obtain  marketing  approval  for  at  least  one
Royalty Product or APG-1252 Work-a-Like Product (collectively, “[***] Product”), and thereafter shall use commercially reasonable efforts
to launch and commercialize each such [***] Product and to fulfil the market demand therefor.

3.2

Diligence Milestones.  Without limiting the it’s general diligence obligations under Section 3.1 above, Unity agrees that

it shall achieve the following diligence milestones with respect to a [***] Product by the deadlines specified below:

Milestone
1. [***]

Time Period

Within [***] ([***]) [***] of the Effective Date

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

6

 
2.   [***]
3.   [***]
4.   [***]

Within [***] ([***]) [***] of the Effective Date
Within [***] ([***]) [***] of the Effective Date
Within [***] ([***]) [***] of the Effective Date

If Unity is unable to meet [***], as applicable, by the specified deadline, Unity shall none-the-less be deemed to be in compliance

with its diligence obligations hereunder so long as it [***].

ARTICLE 4

MANUFACTURE AND SUPPLY

4.1

Within [***] of the effective date of the Library Agreement, the Parties will negotiate and agree upon the terms and
conditions  pursuant  to  which  Ascentage  (itself  or  through  one  or  more  Third  Party  contract  manufacturers)  shall  manufacture  and  supply
Unity,  its  Affiliates  and  their  Third  Party  Sublicensees  with  (a)  Licensed  Product  for  clinical  use,  and  (b)  Licensed  Compound  for
commercial use (the “Supply Agreement”).  Ascentage will appoint [***] and Unity will appoint [***] to negotiate such Supply Agreement
on their respective behalf. For clarity it is acknowledged that [***].

5.1

Equity Grants.

ARTICLE 5

PAYMENTS

5.1.1

Upfront Fee.  As partial consideration for the rights and licenses granted to Unity under this Agreement,
Unity shall issue to Ascentage, subject to Ascentage’s execution and delivery to Unity of a Stock Issuance Agreement in substantially the
form attached hereto as Schedule 5.1 (such form of agreement, the “Stock Agreement”), One Million Five Hundred Seventy Three Thousand
Three  Hundred  Forty  (1,573,340)  shares  of  Unity  common  stock;  such  shares  to  be  issued  to  Ascentage  within  [***]  ([***])  days  of  the
Effective Date.

[***].    Upon  the  [***],  Unity  shall  issue  to  Ascentage  Three  Hundred  Ninety  Three  Thousand  Three
Hundred  Thirty  Five  (393,335)  shares  of  Unity  common  stock;  such  shares  to  be  issued  to  Ascentage  pursuant  to  the  Stock  Agreement
within [***] ([***]) days of date that [***] occurs.  For clarity, [***].  

5.1.2

[***].  Upon the [***], Unity shall issue to Ascentage the following number of shares of Unity common
stock based on how long after the Effective Date such [***]; such shares to be issued to Ascentage pursuant to the Stock Agreement within
[***] ([***]) days of date that such [***] occurs:

5.1.3

Effective Date.

(a)

(b)

[***] ([***]) shares of Unity common stock if such [***] occurs within [***] ([***]) [***] of the

[***] ([***]) shares of Unity common stock if such [***] occurs more than [***] ([***]) [***]

after the Effective Date but less than [***] ([***]) [***] after the Effective Date.  

7

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
after the Effective Date.  

(c)

[***] ([***]) shares of Unity common stock if such [***] occurs more than [***] ([***])  [***]

Equity Cap.   Notwithstanding anything in the contrary in this Agreement, the Library Agreement or any
Compound License Agreement(s), the maximum cumulative aggregate number of shares of Unity common stock that Ascentage is eligible to
receive under Sections 6.1 and 6.2 of the Library Agreement, Section 5.1 of any Compound License Agreement(s) and this Section 5.1 is:  

5.1.4

(a)

(b)

[***] ([***]) shares of Unity common stock if only one Licensed Product is developed; and

Three Million Nine Hundred Thirty Three Thousand Three Hundred and Fifty (3,933,350) shares

of Unity common stock if two or more Licensed Products is developed.  

5.2

Development/Sales Milestones.  In partial consideration of the rights and licenses granted herein to Unity, Unity shall

pay Ascentage the following milestone payments:

Licensed Products.  Within [***] ([***]) days after the first achievement by Unity (or any of its Affiliates
or  Third  Party  Sublicensees)  of  each  of  the  following  milestones  with  respect  to  a  Licensed  Product,  Unity  shall  pay  Ascentage  the
corresponding milestone payment set forth below, in accordance with the payment provisions of Article 6 below:

5.2.1

Milestone Event

1. [***]:
2. [***]:
3. [***]:
4. [***]
5. [***]
Total per Licensed Product

Milestone Payment
$[***]
$[***]
$[***]
$[***]
$[***]
$[***]

Unity Bcl-2 [***] Products.  Within [***] ([***]) days after the first achievement by Unity (or any of its
Affiliates  or  Third  Party  Sublicensees)  of  each  of  the  following  milestones  with  respect  to  a  Unity  Bcl-2  [***]  Product,  Unity  shall  pay
Ascentage the corresponding milestone payment set forth below, in accordance with the payment provisions of Article 6 below:

5.2.2

Milestone Event

1. [***]:
2. [***]:
3. [***]:
4. [***]
5. [***]
Total per Unity Bcl-2 [***] Product

5.2.3

Certain Additional Terms.  

8

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

Milestone Payment
$[***]
$[***]
$[***]
$[***]
$[***]
$[***]

 
For clarity, all forms, presentations, formulation and dosage forms of a Licensed Product or Unity
Bcl-2 [***] Product shall be considered one and the same Licensed Product or Unity Bcl-2 [***] Product (as applicable) for purposes of this
Section 5.2.

(a)

(b)

If  Unity  begins  development  of  one  Licensed  Product  or  Unity  Bcl-2  [***]  Product  and  a
milestone  payment  is  made  under  this  Section  5.2,  and  then  Unity  terminates  development  of  such  product  and  begins  development  of  a
second  Licensed  Product  or  Unity  Bcl-2  [***]  Product,  the  milestone  which  was  already  paid  under  this  Section  5.2  for  the  abandoned
product will not be repeated, but the remaining milestone payments hereunder will be due as the second Licensed Product or Unity Bcl-2
[***] Product (as applicable) advances;

In its sole discretion, Unity may elect in lieu of the payment of the milestone payments owing to
Ascentage under this Section 5.2, to grant to Ascentage that number of shares of Unity common stock of equivalent value (based on the Fair
Market Value of such Unity common stock at the time of such grant).  

(c)

5.3

Royalties.    In  partial  consideration  of  the  licenses  granted  herein  to  Unity,  Unity  shall  pay  to  Ascentage  a  running
royalty equal to the percentage set forth below on the Net Sales of each Royalty-bearing Product based on whether such Royalty-bearing
Product is a Licensed Product or Unity Bcl-2 [***] Product, subject to any adjustments set forth in Sections 5.5 and 5.6, and in accordance
with the payment provisions of Article 6 below.

5.3.1

Licensed Products.

Annual Net Sales of Licensed Product
Portion of worldwide annual Net Sales of the Licensed Product less than or equal to [***] Dollars (US$[***])
Portion of worldwide annual Net Sales of the Licensed Product over [***] Dollars (US$[***])

Applicable Royalty Rate
[***]%
[***]%

5.3.2

Unity Bcl-2 [***] Products.

Annual Net Sales of Licensed Product
Portion of worldwide annual Net Sales of the Licensed Product less than or equal to [***] Dollars (US$[***])
Portion of worldwide annual Net Sales of the Licensed Product over [***] Dollars (US$[***])

Applicable Royalty Rate
[***]%
[***]%

5.4

Royalty Term.  Unity’s obligation to pay royalties on Net Sales of Royalty-bearing Products under this Agreement shall
continue  on  a  country-by-country  and  Royalty-bearing  Product-by-Royalty-bearing  Product  basis  until  the  later  of  (a)  abandonment  or
expiration of the last Valid Claim that claims the [***] of the Licensed Compound (or the [***] contained in the Unity Bcl-2 [***] Product)
in  such  country,  (b)  the  date  of  expiry  of  any  applicable  regulatory,  pediatric,  orphan  drug  or  data  exclusivity  obtained  for  such  Royalty-
bearing Product in such country, or (c) ten (10) years after the first commercial sale of the Royalty-bearing Product by or under the authority
of Unity in any country in the Territory.

5.5

Royalty Stacking. Unity shall be entitled to deduct from the amounts owing to Ascentage under Sections 5.2 and 5.3
above [***] percent ([***]%) of any royalties or other payments made to Third Parties for Enabling IP, provided that (a) the total aggregate
amount payable to Ascentage under Sections 5.2 and 5.3 in any [***] may not be reduced to less than [***] percent ([***]%) of the amounts
that would otherwise be due Ascentage in such [***], and (b) Unity shall not be entitled to deduct any royalties or other payments made
under the Existing Agreements. If, in any [***], Unity is not able to fully recover its [***] percent ([***]%) portion of the payments due to a
Third Party, it shall be entitled to carry forward such right of off-set to future [***] with respect to the excess amount

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

9

 
5.6

Generic Products.  If at any time during the term of this Agreement a Generic Product enters the market in any country
and has for a period of at least [***] ([***]) consecutive [***] a market share in such country of at least [***] percent ([***]%) of the then
combined  unit  volume  of  the  corresponding  Royalty-bearing  Product  (i.e.,  the  Royalty-bearing  Product  containing  the  same  active
pharmaceutical  ingredient(s)  as  are  present  in  the  Generic  Product)  and  such  Generic  Product,  then  Unity’s  obligation  to  pay  royalties  to
Ascentage on Net Sales of such Royalty-bearing Product in such country shall be to reduced to [***] percent ([***]%) of the amounts that
would otherwise be due Ascentage under Section 5.3 in such calendar quarter.

5.7

Maximum  Reduction  to  Royalties.    Notwithstanding  anything  to  the  contrary  in  this  Article  5,  in  no  event  shall  the
royalties owing to Ascentage with respect to Net Sales of a Royalty-bearing Product in any country be reduced by cumulative operation of
Sections 5.5 and 5.6 to less than [***] percent ([***]%) of the amounts that would otherwise be due Ascentage under Section 5.3 in such
calendar quarter.

5.8

Combination  Products.    In  the  event  that  a  Royalty-bearing  Product  is  sold  for  a  single  price  in  combination  with
another therapeutically active pharmaceutical ingredient, or other product or service, for which no royalty would be due hereunder if sold
separately,  Net  Sales  from  such  combination  sales,  for  purposes  of  calculating  the  applicable  royalty  rate  and  the  applicable  royalty  due
under Section 5.3 shall be calculated by multiplying the Net Sales of the combination product by the fraction A/(A + B), where A is the
average gross selling price during the previous [***] of the Royalty-bearing Product sold separately and B is the gross selling price during
the previous [***] of the therapeutically active ingredient, product or service.  In the event that separate sales of the Royalty-bearing Product
or the additional therapeutically active ingredient, product or service were not made during the previous [***], then the Net Sales shall be
reasonably  allocated  between  such  Royalty-bearing  Product  and  such  other  active  ingredient,  product  or  service  as  agreed  upon  by  the
Parties, or failing agreement, determined in accordance with Section 13.1 (Dispute Resolution) below.

5.9

Unity’s Covenant.  Unity hereby agrees that any shares of common stock issued to Ascentage will not be diluted unless
diluted in good faith by Unity on a proportionate basis to the other shares of common stock of Unity outstanding at the time of any such
dilution, and subject to the anti-dilution protections as set forth in Unity’s certificate of incorporation, as may be amended from time to time
in good faith; provided further, that Unity shall not take actions that specifically treat Ascentage differently from other holders of common
stock,  or  issue  any  capital  stock  in  a  manner  which  is  intended  to  circumvent  this  covenant.    The  shares  of  common  stock  issued  to
Ascentage  shall  be  duly  adjusted  for  any  bonus  issue,  share  split,  consolidation,  subdivision,  reclassification,  recapitalization  or  similar
arrangement of Unity, in each case in accordance with,

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

10

 
and as expressly contemplated by, Unity’s certificate of incorporation, as may be amended from time to time in good faith.

ACCOUNTING; RECORDS; METHOD OF PAYMENT

ARTICLE 6

6.1

Royalty Reports; Payments, Invoices.  After the first sale of a Royalty-bearing Product on which royalties are payable
by Unity hereunder, Unity shall make quarterly written reports to Ascentage within [***] ([***]) days after the end of each calendar quarter,
stating  in  each  such  report  the  number,  description,  and  aggregate  Net  Sales  of  Royalty-bearing  Product  sold  during  the  calendar  quarter
upon  which  a  royalty  is  payable  under  Article  5  above.    Concurrently  with  the  making  of  such  reports,  Unity  shall  pay  to  Ascentage  all
amounts payable pursuant to Article 5 above, in accordance with the payment provisions of Section 6.3.  

6.2

Records; Inspection.  During the term of this Agreement and for a period of [***] ([***]) years thereafter, Unity and its
Affiliates  shall  keep  complete,  true  and  accurate  books  of  account  and  records  for  the  purpose  of  determining  the  amounts  payable  to
Ascentage under this Agreement.  Ascentage shall have the right to cause an independent, certified public accountant reasonably acceptable
to Unity to audit such records to confirm gross sales, Net Sales and royalty payments for a period covering not more than the preceding [***]
([***]) years.  Unity agrees to either: (a) require each of its Third Party Sublicensees to maintain similar books and records and to open such
records for inspection by an independent, certified public accountant reasonably satisfactory to such Third Party Sublicensee, on behalf of,
and  as  required  by,  Ascentage  for  the  purpose  of  verifying  payments  hereunder,  or  (b)  obtain  such  audits  rights  from  the  Third  Party
Sublicensee  for  itself  and  exercise  such  audit  rights  on  behalf  of  Ascentage  upon  Ascentage’s  request  and  disclose  the  results  thereof  to
Ascentage.   All  such  inspections  may  be  made  no  more  than  once  each  calendar  year  at  reasonable  times  and  on  reasonable  notice.    No
accounting  period  of  Unity  or  its  Affiliate  or  Third  Party  Sublicensee  shall  be  subject  to  audit  more  than  one  time  hereunder.    Such
independent,  certified  public  accountant  will  be  obliged  to  execute  a  reasonable  confidentiality  agreement  prior  to  commencing  any  such
inspection.  The results of any inspection hereunder shall be provided to both Parties, and Unity shall pay any underpayment to Ascentage
within [***] ([***]) days.  Inspections conducted under this Section 6.2 shall be at the expense of Ascentage (and Ascentage will reimburse
Unity’s reasonable out-of-pocket costs of those inspections conducted by Unity at Ascentage’s request under (b) above), unless a variation or
error producing an increase exceeding [***] percent ([***]%) of the amount stated for any period is established in the course of any such
inspection, whereupon all costs of such audit of such period will be paid by Unity.

6.3

Payment Method.  All payments due hereunder shall be made in U.S. dollars, and shall be made by bank wire transfer
in  immediately  available  funds  to  an  account  designated  by  Ascentage  in  a  written  notice  to  Unity.    If  any  currency  conversion  shall  be
required in connection with the payment of royalties hereunder, such conversion shall be made by using the exchange rates used by Unity in
calculating Unity’s own revenues for financial reporting purposes.  

6.4

Late  Payments.    Any  payments  due  from  Unity  that  are  not  paid  on  the  date  such  payments  are  due  under  this
Agreement shall bear interest at [***] ([***]%)  above the then prevailing US Federal Funds Target Rate (Bloomberg page: FDTR )
per annum calculated

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

11

 
on a daily basis and payable for the period from the date payment is due until the date payment is actually made.  This Section 6.4 shall in no
way limit any other remedies available to any Party.

PATENT PROSECUTION AND ENFORCEMENT

ARTICLE 7

7.1

Prosecution of Patents within the Licensed Intellectual Property.  

7.1.1

General.

right to control the preparation, filing, prosecution and maintenance of all Licensed Patents using patent counsel of its choice.

(a)

Except  as  set  forth  in  Section  7.1.1(b)  or  Section  7.1.1(c)  hereof,  Ascentage  shall  have  the  sole

(b)

Unity  shall  have  the  first  right,  but  not  the  obligation,  to  prepare,  file,  prosecute  and  maintain
Royalty-bearing Product-Specific Patents.  Unity shall (i) keep Ascentage reasonably informed as to its filing and prosecution strategy for
Royalty-bearing  Product-Specific  Patents  and  the  filing,  prosecution  and  maintenance  of  Royalty-bearing  Product-Specific  Patents,
(ii) provide Ascentage with a reasonable opportunity to review drafts of proposed patent office submissions with respect to Royalty-bearing
Product-Specific Patents; and (iii) consider in good faith the requests and suggestions of Ascentage with respect to strategies for filing and
prosecuting such Royalty-bearing Product-Specific Patents. In the event that Unity desires to abandon or decline further responsibility for
any  such  Royalty-bearing  Product-Specific  Patent,  Unity  shall  provide  reasonable  prior  written  notice  to  Ascentage  of  such  intention  to
abandon or decline responsibility, but in no case later than [***] ([***]) days prior to any required action relating to the filing, prosecution or
maintenance  of  such  Royalty-bearing  Product-Specific  Patent,  and  Ascentage  shall  have  the  right,  at  its  discretion,  to  assume  such
responsibility.

(c)

With respect to any Licensed Patent (other than a Royalty-bearing Product-Specific Patent) that
claims the Licensed Compound, a Licensed Product or Unity Bcl-2 [***] Product, Ascentage shall have the first right, but not the obligation,
to prepare, file, prosecute and maintain such Licensed Patent and shall (i) keep Unity reasonably informed as to its filing and prosecution
strategy for such Licensed Patent and the filing, prosecution and maintenance of such Licensed Patent, (ii) provide Unity with a reasonable
opportunity to review drafts of proposed patent office submissions with respect to such Licensed Patent; and (iii)  follow the directions given
by  Unity  with  respect  to  filing  and  prosecuting  such  Licensed  Patents,  unless  [***],  in  which  case  [***]  and  [***].    In  the  event  that
Ascentage desires to abandon or decline further responsibility for any Licensed Patent, Ascentage shall provide Unity [***] notice and the
opportunity to assume responsibility for such Licensed Patent.

For purposes of this Article 7, “prosecution and maintenance” of patents and patent applications shall be
deemed to include, without limitation, the conduct of interferences or oppositions, and/or requests for re-examinations, reissues or extensions
of patent terms.

7.1.2

7.2

Enforcement of Licensed Patents.  If either Party determines that a Third Party is making, using or selling a product

that may infringe any Licensed Patent, that Party shall notify the other Party in writing.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

12

 
7.2.1

Infringement by a Competitive Product.  

(a)

With respect to any such infringing activity that involves the manufacture, use or sale by a Third
Party  of  any  product  that  [***]  (“Competitive  Product”),  Unity  shall  have  the  first  right,  at  its  sole  option,  to  bring  suit  to  enforce  any
Licensed  Patent,  and/or  to  defend  any  declaratory  judgment  action  with  respect  thereto  (“Enforcement  Action”);  provided,  however,  that
Unity shall keep Ascentage reasonably informed as to the defense and/or settlement of any such Enforcement Action.  Ascentage shall have
the right to participate in any such Enforcement Action with counsel of its own choice at its own expense.  All recoveries received by Unity
from  an  Enforcement  Action  shall  be  first  applied  to  reimburse  Unity’s  and  then  Ascentage’s  unreimbursed  expenses,  including  without
limitation,  reasonable  attorney’s  fees  and  court  costs.   Any  remainder  shall,  to  the  extent  the  same  pertains  to  an  infringing  activity  that
involves the manufacture, use or sale by a Third Party of any Competitive Product, be treated as Net Sales.

(b)

In the event Unity elects not to initiate an Enforcement Action with respect to any commercially
significant infringing activity that involves the manufacture, use or sale by a Third Party of any Competitive Product within [***] ([***])
days of a request by Ascentage to do so ([***]), Ascentage may initiate such action at its expense.  Unity shall have the right to participate in
any such action with counsel of its own choice at its own expense.  All recoveries received by Ascentage from an Enforcement Action shall
be first applied to reimburse Ascentage’s and then Unity’s unreimbursed expenses, including without limitation, reasonable attorney’s fees
and court costs.  Any remainder shall, to the extent the same pertains to an infringement of the Licensed Patents, be split [***].

7.2.2

Other  Instances  of  Infringement.    With  respect  to  any  such  infringing  activity  that  does  not  involve  the
manufacture, use or sale by a Third Party of a Competitive Product, Ascentage shall have the sole right, at its sole option, to bring suit to
enforce any Licensed Patent, and/or to defend any declaratory judgment action with respect thereto and to retain all recoveries received by
Ascentage in connection therewith.  

7.3

Infringement  Claims  Against  Unity.  If  the  production,  sale  or  use  of  a  Royalty-bearing  Product  pursuant  to  this
Agreement results in any claim, suit or proceeding alleging patent infringement against Unity (or its Affiliates or sublicensees), Unity shall
promptly notify Ascentage thereof in writing setting forth the facts of such claim in reasonable detail.  As between the Parties, Unity will be
entitled to control the defense in any such action(s).  Unity agrees to keep Ascentage reasonably informed of all material developments in
connection with any such claim, suit or proceeding as it relates to the Licensed Intellectual Property. Notwithstanding the above, Unity shall
not admit the invalidity of any Licensed Patent without written consent from Ascentage.  

7.4

Cooperation.  In any legal action undertaken by a Party pursuant to Sections 7.2 or 7.3 of this Agreement (the Party
bringing  or  defending  such  legal  action,  the  “Enforcing  Party”),  the  non-Enforcing  Party  shall  cooperate  fully  with  the  Enforcing  Party,
including without limitation by joining as a party plaintiff if necessary for legal standing and executing such documents as the Enforcing
Party may reasonably request.  Upon the request of, and at the expense of, the Enforcing Party, the non-Enforcing Party shall make available
at reasonable times and

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

13

 
under  appropriate  conditions  all  relevant  personnel,  records,  papers,  information,  samples,  specimens  and  other  similar  materials  in  its
possession.

7.5

No Implied Obligations.  Except as expressly provided in this Article 7, neither Party has any obligation to bring or

prosecute actions or suits against any Third Party for patent infringement.

7.6

UM  License  Agreement.    Notwithstanding  the  foregoing  provisions  of  this  Article  7,  with  respect  to  the  Licensed
Patents  subject  of  the  UM  License  Agreement,  Unity’s  rights  under  this  Article  7  shall  be  limited  to  the  extent  of  Ascentage’s  rights  to
prosecute and enforce such Licensed Patents under the UM License Agreement, provided that (a) with respect to Royalty-bearing Product-
Specific  Patents  that  have  been  in-licensed  from  UM,  to  the  extent  the  UM  License  Agreement  will  not  permit  Unity  to  control  the
prosecution of such patents, Ascentage agrees to (i) share with Unity the information Ascentage receives from UM under Section 7.2 of the
UM License Agreement with respect to such patents, (ii) provide Unity with a reasonable opportunity to review and comment upon such
information; and (iii)  pass  along  to  UM  Unity’s  comments  and  requested  actions, and (b) Ascentage shall at Unity’s request and expense
cooperate with Unity in order to allow Unity to exercise on Ascentage’s behalf the enforcement rights granted to Ascentage under Section
8.1 of the UM License Agreement, in each case as permitted by the UM License Agreement.

OPTION FOR CHINA JOINT VENTURE

7.6

Option  for  China  JVCO.    Unity  shall  grant  to  Ascentage  an  option  to  commercialize  one  or  more  Royalty-bearing
Products  for  use  in  the  Field  in  Greater  China  jointly  with  Unity  through  a  joint  venture  entity  (“China  JVCO”)  to  be  established  in
accordance with Section 8.4 of the Library Agreement(“JVCO Option”).  The process for exercise of the JVCO Option shall be agreed upon
by [***] and [***] at [***].

7.7

Limitation of Obligations; Certain Covenants

8.2.1.  Notwithstanding anything to the contrary, nothing in this Agreement shall be deemed to have granted Unity or any of its
sublicensees  the  right  to  develop,  manufacture,  distribute,  sell  or  otherwise  commercialize  the  Royalty-bearing  Products  in  the  Greater
China.

8.2.2

Ascentage  hereby  covenants  that  it  shall  not  develop,  manufacture,  distribute,  sell  or  otherwise  commercialize  (a)
Unity Bcl-2 [***] Products or (b) the Licensed Compound (including any Licensed Products containing the Licensed Compound) for use in
the Field in the Greater China except through the China JVCO.   In the event of a breach by Ascentage of its obligations under this Section
8.2.2, the [***] and [***], shall [***].

8.2.3

Unity and Ascentage hereby covenant that they shall cooperate with respect to the establishment of the China JVCO,
including without limitation by (a) initiating negotiation of the form agreements relating to the JVCO within [***] of the Effective Date, (b)
using  commercially  reasonable  efforts  to  reach  agreement  on  such  form  agreements  within  [***]  ([***])  [***]  of  the  Effective  Date,
including  ensuring  that  [***]  and  [***]  devote  at  least  [***]  to  such  negotiations  until  such  form  agreements  are  agreed  upon,  and  (c)
signing the agreements for establishment of the China JVCO agreed upon by [***] and [***].

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

14

 
CONFIDENTIALITY

7.8

Confidential  Information.    Except  as  otherwise  expressly  provided  herein,  the  parties  agree  that  the  receiving  party
shall  not,  except  as  expressly  provided  in  this  Article  9,  disclose  to  any  Third  Party  or  use  for  any  purpose  any  information  which  is
disclosed  to  it  by  the  other  party,  whether  orally  or  in  writing,  and  identified  as  confidential  (“Confidential  Information”),  except  to  the
extent that it can be established by the receiving party by competent proof that such information:

time of disclosure;

(a)

(b)

disclosure to the receiving party;

Was already known to the receiving party, other than under an obligation of confidentiality, at the

Was  generally  available  to  the  public  or  otherwise  part  of  the  public  domain  at  the  time  of  its

disclosure and other than through any act or omission of the receiving party in breach of this Agreement;

(c)

Became  generally  available  to  the  public  or  otherwise  part  of  the  public  domain  after  its

the disclosing party as demonstrated by documented evidence prepared contemporaneously with such independent development; or

(d)

Was independently developed by the receiving party without reference to information provided by

Party who had no obligation to the disclosing party not to disclose such information to others.

(e)

Was disclosed to the receiving party, other than under an obligation of confidentiality, by a Third

7.9

Permitted Use and Disclosures.  Each party hereto may use or disclose Confidential Information of the other party to
the  extent  such  use  or  disclosure  is  reasonably  necessary  in  the  following  instances:  (a)  exercising  the  rights  granted  to  it  hereunder
(including,  in  the  case  of  Unity,  developing,  commercializing  and/or  sublicensing  of  Royalty-bearing  Products)  or  in  carrying  out  its
obligations  hereunder;  (b)  filing  or  prosecuting  Patents  as  permitted  by  this  Agreement;  (c)  prosecuting  or  defending  litigation;  and
(d) complying with applicable court orders or governmental regulations.  Notwithstanding the foregoing, in the event a party is required to
make  a  disclosure  of  the  other  party’s  Confidential  Information  pursuant  to  clause  (c)  or  (d)  of  this  Section  9.2,  it  will,  except  where
impracticable, give reasonable advance notice to the disclosing party of such disclosure and use efforts to secure confidential treatment of
such information at least as diligent as such party would use to protect its own confidential information, but in no event less than reasonable
efforts.  In addition, Unity shall have the right to disclose Confidential Information regarding the Licensed Compound or Licensed Products
to Third Parties in connection with due diligence or similar investigations, to potential Third Party investors, and others on a need to know
basis, in each case under terms of confidentiality that are appropriate for the circumstances, or to the extent required by law.

7.10

Nondisclosure of Terms.  Each of the parties hereto agrees not to disclose the terms of this Agreement to any Third
Party without the prior written consent of the other party hereto, which consent shall not be unreasonably withheld; provided that a party may
disclose the terms of this Agreement without such consent to such party’s attorneys and advisors, to Third Parties in

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

15

 
connection with due diligence or similar investigations, to potential Third Party investors, and others on a need to know basis, in each case
under terms of confidentiality that are appropriate for the circumstances, or to the extent required by law.

7.11

Public Announcement.  Unity may, in its discretion, issue a press release announcing the formation of this Agreement,
which shall be substantially in a form approved by Ascentage prior to execution of the Agreement.  Except with respect to such initial release
or  as  otherwise  required  by  law,  neither  party  shall  issue  an  additional  press  release  or  public  announcement  relating  to  this  Agreement
without  the  prior  written  approval  of  the  other  party,  which  shall  not  be  withheld  unreasonably.    Either  party  may  refer  to  the  license
granted    under  this  Agreement  in  promotional  and  other  communications  with  prospective  customers  and  investors,  subject  to  the  prior
written approval of the other party of the form, substance and intended use of such reference, and provided that such disclosure shall not
include any technical details or any financial terms of the license.  For purposes of clarification, after a party has obtained the other party’s
written approval of the form, substance and intended use of a particular reference, no further approval of the other party will be required for
inclusion of the same reference in future communications that are intended for the same use.

ARTICLE 8

INDEMNIFICATION

8.1

Unity.    Unity  agrees  to  indemnify  and  defend  Ascentage  and  its  directors,  officers,  employees,  agents  and  their
respective  successors,  heirs  and  assigns  (the  “Ascentage  Indemnitees”)  against  any  losses,  costs,  claims,  damages,  liabilities  or  expense
(including  reasonable  attorneys’  and  professional  fees  and  other  expenses  of  litigation)  (collectively,  “Liabilities”)  arising,  directly  or
indirectly  out  of  or  in  connection  with  Third  Party  claims,  suits,  actions,  demands  or  judgments,  to  the  extent  (a)  relating  to  Licensed
Products developed, manufactured, used, sold or otherwise distributed by or on behalf of Unity, its Affiliates, sublicensees or other designees
(excluding  Ascentage,  its  Affiliates  and  licensees)  including,  without  limitation,  product  liability  and  patent  infringement  claims,  or
(b)  resulting  from  a  breach  by  Unity  of  its  representations  and  warranties  under  this  Agreement,  except,  in  each  case,  to  the  extent  such
Liabilities  result  from  the  negligence  or  intentional  misconduct  of  Ascentage  or  Ascentage’s  breach  of  its  representations  and  warranties
under this Agreement or the Supply Agreement to be negotiated pursuant to Article 4 above.

8.2

Ascentage.   Ascentage  agrees  to  indemnify  and  defend  Unity  and  its  directors,  officers,  employees,  agents  and  their
respective heirs and assigns (the “Unity Indemnitees”) against any Liabilities arising, directly or indirectly out of or in connection with Third
Party claims, suits, actions, demands or judgments, to the extent resulting from a breach by Ascentage of its representations and warranties
under  this  Agreement  or  the  Supply  Agreement  to  be  negotiated  pursuant  to  Article  4  above,  except,  in  each  case,  to  the  extent  such
Liabilities result from the negligence or intentional misconduct of Unity or Unity’s breach of its representations and warranties under this
Agreement.

8.3

Procedure.    In  the  event  that  any  party  intends  to  claim  indemnification  under  this  Article  10  (each  such  party,  an
“Indemnitee”) it shall promptly notify the other Party in writing of such alleged Liability.  The indemnifying Party shall have the right to
control the defense thereof

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

16

 
with counsel of its choice as long as such counsel is reasonably acceptable to Indemnitee; provided, however, that any Indemnitee shall have
the right to retain its own counsel at its own expense, for any reason, including if representation of any Indemnitee by the counsel retained by
the indemnifying Party  would  be  inappropriate due to actual or potential differing interests between such Indemnitee and any other Party
reasonably represented by such counsel in such proceeding.  The indemnifying Party  shall  keep  the  Indemnitee  regularly  informed  of  the
status of the defense of any action, claim or liability covered by this Article 10 and shall take into consideration the Indemnitee’s reasonable
comments thereon.  The affected Indemnitee shall cooperate with the indemnifying Party and its legal representatives in the investigation of
any action, claim or liability covered by this Article 10.  The Indemnitee shall not compromise or settle any claim or suit, or voluntarily incur
any expense with respect to any such claim or suit, in each case, without the prior written consent of the indemnifying Party, which such
Party  shall  not  be  required  to  give.  The  failure  to  deliver  written  notice  to  the  indemnifying  Party  within  a  reasonable  time  after  the
commencement of any action with respect to any action, claim or liability covered by this Article 10, if prejudicial to its ability to defend
such action, shall relieve the indemnifying Party of any liability to the Indemnitee under this Article 10.  

ARTICLE 9

REPRESENTATIONS AND WARRANTIES

9.1

General Warranties.  Each Party represents and warrants to the other Party that it is a corporation duly organized and
validly existing under the laws of the state or country of its incorporation, the execution, delivery and performance of this Agreement by
such  Party  has  been  duly  authorized  by  all  requisite  corporate  action,  and  it  has  the  power  and  authority  to  execute  and  deliver  this
Agreement and to perform its obligations hereunder (including, in the case of Ascentage, granting the rights and licenses described in Article
2).  

9.2
Effective Date:

Ascentage Warranties.  Ascentage represents and warrants on its own behalf and on behalf of its Affiliates that as of the

except  as  otherwise  disclosed  to  Unity  in  writing  prior  to  the  Effective
Date,  (i)  Ascentage  has  not  received  written  notice  from  a  Third  Party  claiming  that  the  Licensed  Compound  infringes  the  intellectual
property  rights  of  any  Third  Party,  and  (ii)  Ascentage  is  not  a  party  to  any  legal  action,  suit  or  proceeding  relating  to  the  Licensed
Compound.

(a)

except  as  otherwise  disclosed  to  Unity  in  writing  prior  to  the  Effective
Date, there are no actual or pending actions, suits or claims, by any Third Party (i) challenging the ownership of the Licensed Compound; or
(b) challenging the validity, effectiveness, enforceability, or ownership of the Licensed Intellectual Property.

(b)

except  as  otherwise  disclosed  to  Unity  in  writing  prior  to  the  Effective
Date,  the  Licensed  Patents  are  subsisting,  in  force  or  pending,  as  the  case  may  be,  and  are  not  the  subject  of  any  interference,  reissue,
reexamination, opposition, cancellation or similar administrative proceedings.

(c)

Date, Ascentage has not brought a claim alleging an infringement by a Third Party of

(d)

except  as  otherwise  disclosed  to  Unity  in  writing  prior  to  the  Effective

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

17

 
any of the Licensed Patents and to Ascentage’s actual knowledge, there is no actual or alleged infringement by a Third Party of any of the
Patents within the Licensed Patents.

there are no Patents: (a) filed by Ascentage and subsequently assigned to Third Party, or (b) with
respect to which Ascentage or its Affiliates have acquired rights from a Third Party (i.e., through in-licenses, cross-licenses or otherwise), in
each case that (i) would be required for Unity to research, develop, manufacture, use or commercialize the Licensed Compound and (ii) are
not included within the Licensed Intellectual Property.

(e)

(f)

except as otherwise disclosed to Unity in writing prior to the Effective Date, there are no actual or
pending suits or claims by any Third Party asserting that the manufacture, use, sale, offer for sale or importing of the Licensed Compound
infringes the intellectual property of a Third Party and to Ascentage’s knowledge, the development and commercialization of the Licensed
Compound  would  not  infringe  (i)  any  issued  Patents  of  any  Third  Party  (other  than  Patents  in-licensed  from  UM),  or  (ii)  any  published
Patent claim of any Third Party (other than claims of Patents in-licensed from UM) if such claim were to issue as published.

Ascentage  has  disclosed  to  Unity  all  material  agreements  with  Third  Parties  in  effect  as  of  the
Effective Date pursuant to which Licensed Intellectual Property was licensed, acquired or sold, including without limitation all amendments
to the UM License Agreement entered into by UM and Ascentage subsequent to the effective date of the License Agreement.

(g)

Licensed Intellectual Property that are inconsistent with the rights and licenses granted to Unity herein.

(h)

Ascentage  has  not  previously  granted  and  will  not  grant  any  rights  in  the

9.3

Certain Rights and Obligations under the UM License Agreement.

same would materially and adversely affect Unity’s rights under this Agreement.

(a)

Ascentage shall not modify, amend or otherwise alter the UM License Agreement to the extent the

Ascentage shall not (a) exercise or fail to exercise any right under the UM License Agreement or
(b) provide or fail to provide any consent or approval with respect to any right or obligation under the UM License Agreement, in each case
to the extent the same would materially and adversely affect Unity’s rights under this Agreement.

(b)

(c)

Ascentage shall not unilaterally terminate the UM License Agreement.

9.4

Disclaimer.  EXCEPT  AS  OTHERWISE  EXPRESSLY  SET  FORTH  IN  THIS  AGREEMENT,  NEITHER  PARTY
MAKES  ANY  REPRESENTATIONS  OR  EXTENDS  ANY  WARRANTIES  TO  THE  OTHER  PARTY  OF  ANY  KIND,  EITHER
EXPRESS  OR  IMPLIED,  REGARDING  THE  LICENSED  COMPOUND,  LICENSED  PRODUCTS,  UNITY  BCL-2  SYSTEMIC
PRODUCTS  OR  THE  LICENSED  INTELLECTUAL  PROPERTY,  INCLUDING,  BUT  NOT  LIMITED  TO,  WARRANTIES  OF
MERCHANTABILITY, FITNESS FOR A

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

18

 
PARTICULAR PURPOSE, NONINFRINGEMENT, AND VALIDITY OF LICENSED INTELLECTUAL PROPERTY CLAIMS, ISSUED
OR PENDING.

9.5

Limitation of Liability.  EXCEPT FOR LIABILITY FOR BREACH OF ARTICLE 9, NEITHER PARTY SHALL BE
ENTITLED  TO  RECOVER  FROM  THE  OTHER  PARTY  ANY  SPECIAL,  INCIDENTAL,  CONSEQUENTIAL  OR  PUNITIVE
DAMAGES IN CONNECTION WITH THIS AGREEMENT; provided, however, that this Section 11.5 shall not be construed to limit either
party’s indemnification obligations under Article 10.  

ARTICLE 10

TERM AND TERMINATION

10.1

Term. The term of this Agreement shall commence on the Effective Date and, unless earlier terminated as provided in
this Article 12, shall continue in full force and effect on a country-by-country basis until the expiration of all royalty obligations pursuant to
this Agreement for such country, as provided in Section 5.4 above. Unity's license with respect to the Licensed Technology shall survive the
expiration (but not an earlier termination) of this Agreement, provided that such license shall thereafter become nonexclusive and fully paid-
up.

10.2

Termination  for  Breach.    Either  Party  may  terminate  this  Agreement  in  the  event  that  the  other  Party  shall  have
materially  breached  or  defaulted  in  the  performance  of  any  of  its  material  obligations  hereunder,  and  such  breach  or  default  shall  have
continued  for  sixty  (60)  days  after  written  notice  of  such  breach  and  intent  to  terminate  this  Agreement  therefor  was  provided  to  the
breaching Party by the nonbreaching Party. Any such termination shall become effective at the end of such sixty (60) day period unless the
breaching Party has cured any such breach or default prior to the expiration of the sixty (60) day period.  Notwithstanding the foregoing, if
the Party alleged to be in breach of this Agreement in good faith disputes such breach within such sixty (60) day period, the nonbreaching
Party  shall  not  have  the  right  to  terminate  this  Agreement  unless  it  has  been  determined  by  arbitration  pursuant  to  Section  13.2  that  this
Agreement was materially breached, and the breaching Party fails to comply with its obligations hereunder within sixty (60) days after such
determination.

10.3

Termination by Unity. Any provision herein notwithstanding, Unity may terminate this Agreement, in its entirety or as
to any particular Patent within the Licensed Patents, or as to any particular Licensed Product, at any time by giving Ascentage at least ninety
(90) days prior written notice.  From and after the effective date of a termination under this Section 12.3 with respect to a particular Patent in
a  particular  country,  such  Patent  shall  cease  to  be  within  the  Licensed  Patents  for  all  purposes  of  this  Agreement,  and  all  rights  and
obligations of Unity with respect to such Patent(s) shall terminate.  From and after the effective date of a termination under this Section 12.3
with  respect  to  a  particular  Licensed  Product,  the  license  granted  under  Section  2.1  above  shall  terminate  with  respect  to  such  Licensed
Product, and the same shall cease to be a Licensed Product for all purposes of this Agreement.  Upon a termination of this Agreement in its
entirety under this Section 12.3, all rights and obligations of the parties shall terminate, except as provided in Section 12.4 below.  For clarity,
Unity  shall  remain  obligated  to  pay  any  and  all  milestone  and  other  payments  accrued,  due  and  payable  to  Ascentage  prior  to  such
termination.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

19

 
10.4

Effect of Termination.  

10.4.1

Accrued  Obligations.  Expiration  or  any  termination  of  this  Agreement  shall  not  release  either  Party
hereto from any liability which at the time of such expiration or termination has already accrued to such Party or which is attributable to a
period prior to such expiration or termination, subject to the terms of this Agreement, nor preclude either Party from pursuing any rights and
remedies it may have hereunder or at law or in equity which accrued to it prior to such expiration or termination, subject to the terms of this
Agreement.

10.4.2

Sales  of  Existing  Inventory  of  Licensed  Product.    In  the  event  this  Agreement  is  terminated  for  any
reason with respect to a Licensed Product after the first approval of an MAA for such Licensed Product, Unity shall provide Ascentage with
a written inventory of all quantities of such Licensed Product that Unity and its Affiliates have in stock and, for a period of [***] ([***])
[***] after such termination, Unity and its Affiliates shall have the right to sell or otherwise dispose of such Licensed Product, all subject to
the payment to Ascentage of royalties pursuant to Article 5 hereof.

10.4.3

Survival of Sublicenses.  Upon termination of this Agreement for any reason, any sublicense granted by
Unity hereunder to a Third Party Sublicensee shall survive, provided that such Third Party Sublicensee continues to pay to Ascentage the
milestones and royalties that would have been due to Ascentage under this Agreement based on such Third Party Sublicensee’s activities had
this Agreement not terminated.  For clarity, in the event that a Third Party Sublicensee fails to pay to Ascentage the applicable milestones
and royalties due to Ascentage based on such Third Party Sublicensee’s activities, Ascentage shall be entitled to terminate such surviving
sublicense by providing such Third Party Sublicensee written notice of termination, which notice shall take effect [***] ([***]) days after it
is received by such Third Party Sublicensee unless such Third Party Sublicensee has cured any such breach or default prior to the expiration
of the [***] ([***]) day period.

termination of the Library Agreement, and vice versa.  

10.4.4

Library Agreement.   This  Agreement  is  independent  of,  and  shall  not  be  affected  by,  the  expiration  or

10.4.5

Survival.  Articles 1 (Definitions), 6 (Accounting; Records; Method of Payment), 9 (Confidentiality), 10
(Indemnification), 13 (Dispute Resolution) and 14 (Miscellaneous), and Sections 2.1.1(b), 2.1.2(c), 5.2.2, 5.3.2 and 5.4-5.8, (with respect to
[***]),  7.2.1  (with  respect  to  any  ongoing  Enforcement  Action),  11.3,  11.4  and  12.4  shall  survive  the  expiration  or  termination  of  this
Agreement  for  any  reason,  provided  that  such  survival  shall  be  contingent  upon  Unity  having  fulfilled  its  obligations  under  Section
5.1.1.  Except as otherwise provided in this Article 12, all rights and obligations of the parties under this Agreement shall terminate upon the
expiration or termination of this Agreement.

10.5

Condition Precedent.  

This Agreement is entered into subject to the condition precedent that Ascentage and UM agree upon and
execute an amendment to the UM License Agreement (“Second Amendment”) adjusting the royalties owing to UM in connection with the
activities contemplated by this Agreement (including the attached Exhibits). All rights and obligations set forth in the

10.5.1

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

20

 
Agreement shall only become effective upon the Effective Date.  

Amendment as soon as reasonably practicable.

10.5.2

Ascentage  hereby  agrees  to  use  its  commercially  best  efforts  to  complete  and  execute  the  Second

ARTICLE 11

DISPUTE RESOLUTION

11.1

Dispute Resolution.  If an unresolved dispute arises out of or relates to this Agreement, or the breach thereof, either
Party may refer such dispute to the [***] of Unity and Ascentage, who shall meet in person or by telephone within [***] ([***]) days after
such referral to attempt in good faith to resolve such dispute.  If such matter cannot be resolved by discussion of such officers within such
[***] ([***]) days period (as may be extended by mutual agreement), either Party shall be entitled to seek resolution of such dispute pursuant
to Section 13.2 below.

11.2

Arbitration.  If the parties are unable to resolve a dispute on an issue of interpretation, breach or enforcement of this
Agreement, the parties shall refer such dispute to be finally resolved by binding arbitration under the terms of this Section 13.2, except that
all disputes with respect to the validity or infringement of Patents shall be subject to applicable federal court jurisdiction and not subject to
the terms of this Section 13.2.  Whenever a party shall decide to institute arbitration proceedings, it shall give written notice to that effect to
the other party.  Any such arbitration shall be conducted under the [***] by a panel of three (3) arbitrators in [***].  Each party shall select
one (1) arbitrator who is not employed by, or otherwise affiliated with, such party within [***] ([***]) days after the institution of arbitration
proceedings, and the two (2) arbitrators so selected shall designate the third arbitrator.  The parties shall use their commercially reasonable
efforts to conclude the arbitration hearings within [***] ([***]) [***] following the confirmation of the third and presiding arbitrator.

11.3

Injunctive  Relief.    Each  Party  shall  be  free  to  seek  preliminary  or  permanent  injunctive  relief,  restraining  order  or
degree of specific performance in any court of competent jurisdiction.  For avoidance of doubt, any such equitable remedies provided under
this Section 13.3 shall be cumulative and not exclusive and are in addition to any other remedies, which either Party may have under this
Agreement or applicable law.

ARTICLE 12
MISCELLANEOUS

12.1

Governing Laws.  This Agreement and any dispute arising from the construction, performance or breach hereof shall
be governed by and construed, and enforced in accordance with, the laws of the state of New York, USA, without reference to conflicts of
laws principles.

12.2

Waiver.    It  is  agreed  that  no  waiver  by  either  Party  hereto  of  any  breach  or  default  of  any  of  the  covenants  or

agreements herein set forth shall be deemed a waiver as to any subsequent and/or similar breach or default.

12.3

Assignment.   This  Agreement  shall  not  be  assignable  by  either  party  without  the  written  consent  of  the  other  party
hereto,  except  that  either  party  may  assign  this  Agreement,  without  such  consent,  to  an  entity  that  acquires  all  or  substantially  all  of  the
business or assets of

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

21

 
such party to which this Agreement relates, whether by merger, reorganization, acquisition, sale, or otherwise; provided, however, that within
[***]  ([***])  days  of  such  an  assignment,  the  assignee  shall  agree  in  writing  to  be  bound  by  the  terms  and  conditions  of  this
Agreement.  Subject to the foregoing, this Agreement shall bind and inure to the benefit of each party’s successors and permitted assigns.  

12.4

Independent Contractors.  The relationship of the Parties hereto is that of independent contractors.  The Parties hereto
are  not  deemed  to  be  agents,  partners  or  joint  venturers  of  the  others  for  any  purpose  as  a  result  of  this  Agreement  or  the  transactions
contemplated thereby.

12.5

Compliance with Laws.  In exercising their rights under this Agreement, the Parties shall fully comply in all material
respects with the requirements of any and all applicable laws, regulations, rules and orders of any governmental body having jurisdiction
over  the  exercise  of  rights  under  this  license  including,  without  limitation,  those  applicable  to  the  discovery,  development,  manufacture,
distribution, import and export and sale of Licensed Products pursuant to this Agreement.

12.6

Notices.    All  notices,  requests  and  other  communications  hereunder  shall  be  in  writing  and  shall  be  personally
delivered or by registered or certified mail, return receipt requested, postage prepaid, in each case to the respective address specified below,
or such other address as may be specified in writing to the other Parties hereto and shall be deemed to have been given upon receipt:

If to Unity:

Unity Biotechnology, Inc.

Attention: [***]

1700 Owens Street, Suite 535
San Francisco, CA 94158, USA

Email: [***]

If to Ascentage:

Ascentage Pharma Group Corp. Ltd.

Room 201, QB3 Building, Medical City Avenue
Hi-Tech BioMed District, Taizhou City, Jiangsu Province
P.R. China, 225300
Attention: [***]

Email: [***]  

12.7

Severability.    In  the  event  that  any  provision  of  this  Agreement  becomes  or  is  declared  by  a  court  of  competent
jurisdiction to be illegal, unenforceable or void, this Agreement shall continue in full force and effect to the fullest extent permitted by law
without said provision, and the Parties shall amend the Agreement to the extent feasible to lawfully include the substance of the excluded
term to as fully as possible realize the intent of the Parties and their commercial bargain.  

12.8

Advice of Counsel.  Unity and Ascentage have each consulted counsel of their choice regarding this Agreement, and
each acknowledges and agrees that this Agreement shall not be deemed to have been drafted by one Party or another and will be construed
accordingly.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

22

 
 
12.9

Performance  Warranty.    Each  Party  hereby  warrants  and  guarantees  the  performance  of  any  and  all  rights  and

obligations of this Agreement by its Affiliates, licensees and sublicensees.

12.10

Force Majeure.  Neither Party shall lose any rights hereunder or be liable to the other Party for damages or losses
(except for payment obligations) on account of failure of performance by the defaulting Party if the failure is occasioned by war, strike, fire,
Act  of  God,  earthquake,  flood,  lockout,  embargo,  unusual  and  unexpected  governmental  intervention,  failure  of  suppliers,  or  any  other
reason where failure to perform is beyond the reasonable control and not caused by the negligence, intentional conduct or misconduct of the
non-performing Party and such Party has exerted all reasonable efforts to avoid or remedy such force majeure; provided, however, that in no
event shall a Party be required to settle any labor dispute or disturbance.

12.11

Complete  Agreement.    This  Agreement  with  its  schedules,  together  with  the  Library  Agreement  and  its  exhibits,
constitutes the entire agreement, both written and oral, between the Parties with respect to the subject matter hereof, and all prior agreements
respecting the subject matter hereof, either written or oral, express or implied, shall be abrogated, canceled, and are null and void and of no
effect.    No  amendment  or  change  hereof  or  addition  hereto  shall  be  effective  or  binding  on  either  of  the  Parties  hereto  unless  reduced  to
writing and executed by the respective duly authorized representatives of Unity and Ascentage.

12.12

Headings.  The captions to the several Sections and Articles hereof are not a Part of this Agreement, but are included

merely for convenience of reference and shall not affect its meaning or interpretation.

12.13

Counterparts.  This Agreement may be executed in counterparts, each of which shall be deemed to be an original and

all of which together shall be deemed to be one and the same agreement.

12.14

Bankruptcy.  All rights and licenses granted under or pursuant to this Agreement by each Party as a licensor are, and
shall  otherwise  be  deemed  to  be,  for  purposes  of  Section  365(n)  of  Title  ll,  U.S.  Code  (the  “Bankruptcy  Code”),  licenses  of  rights  to
“intellectual property” as defined under section 101(35A) of the Bankruptcy Code.  The Parties agree that each licensee of such rights under
this  Agreement,  shall  retain  and  may  fully  exercise  all  rights  and  elections  it  would  have  in  the  case  of  a  licensor  bankruptcy  under  the
Bankruptcy Code.  Each Party agrees during the term of this Agreement to create or maintain current copies, or if not amenable to copying,
detailed descriptions or other appropriate embodiments, of all such intellectual property licensed to the other Party.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

23

 
IN WITNESS WHEREOF, the Parties hereto have caused their duly authorized representatives to execute this Agreement.

ASCENTAGE PHARMA GROUP CORP. LTD.

UNITY BIOTECHNOLOGY, INC.

By:/s/ Dajun Yang

Name: Dajun Yang, MD, PhD

Title:  Chief Executive Officer

By: /s/ Nathaniel David

Name:  Nathaniel David, PhD

Title:  Chief Executive Officer

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

24

 
 
 
 
 
 
SCHEDULE 1.2

APG-1252

[***]

Confidential Information 

(Property of Ascentage Pharma Group)

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

25

 
 
 
 
 
 
 
 
 
SCHEDULE 5.1

FORM OF STOCK ISSUANCE AGREEMENT

UNITY BIOTECHNOLOGY, INC.

RESTRICTED STOCK GRANT AGREEMENT

This  Restricted  Stock  Grant  Agreement  (the  “Agreement”)  is  made  as  of  [ ● ]  by  and  between  Unity  Biotechnology,  Inc.,  a

Delaware corporation (the “Company”), and Ascentage Pharma Group Corp. Ltd. (the “Grantee”).

In consideration of the mutual covenants and representations set forth below, the Company and Grantee agree as follows:

1.

Grant of the Shares. Subject to the terms and conditions of this Agreement, the Company agrees to grant to Grantee, and
Grantee agree to acquire from the Company, on the Closing (as defined below) [●] shares of the Company’s Common Stock, $0.0001 par
value per share (the “Shares”), as consideration for services to be provided by Grantee to the Company.

2.

Closing. The transfer of the Shares shall occur at a closing (the “Closing”) to be held on the date first set forth above, or
at any other time mutually agreed upon by the Company and Grantee. The Closing will take place at the principal office of the Company or
at such other place as shall be designated by the Company. As promptly after the Closing as practicable, the Company will issue a stock
certificate, registered in the name of Grantee, reflecting the Shares.

3.

Restrictions on Transfer.

A.

Investment  Representations  and  Legend  Requirements.  The  Grantee  hereby  make  the  investment
representations listed on Exhibit A to the Company as of the date of this Agreement and as of the date of the Closing, and agrees that such
representations  are  incorporated  into  this  Agreement  by  this  reference,  such  that  the  Company  may  rely  on  them  in  issuing  the  Shares.
Grantee  understand  and  agree  that  the  Company  shall  cause  the  legends  set  forth  below,  or  substantially  equivalent  legends,  to  be  placed
upon  any  certificate(s)  evidencing  ownership  of  the  Shares,  together  with  any  other  legends  that  may  be  required  by  the  Company  or  by
applicable state or federal securities laws:

THE  SECURITIES  REPRESENTED  BY  THIS  CERTIFICATE  HAVE  NOT  BEEN
REGISTERED  UNDER  THE  SECURITIES  ACT  OF  1933,  AS  AMENDED,  OR  THE
SECURITIES  LAWS  OF  ANY  STATE,  AND  MAY  NOT  BE  SOLD,  TRANSFERRED,
ASSIGNED,  PLEDGED  OR  HYPOTHECATED  UNLESS  AND  UNTIL  REGISTERED
UNDER SUCH ACT AND/OR APPLICABLE STATE SECURITIES LAWS, OR UNLESS THE
COMPANY  HAS  RECEIVED  AN  OPINION  OF  COUNSEL  OR  OTHER  EVIDENCE,
REASONABLY SATISFACTORY TO THE

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

1

 
 
 
COMPANY AND ITS COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED.

THE  SHARES  REPRESENTED  BY  THIS  CERTIFICATE  ARE  SUBJECT  TO  CERTAIN
RESTRICTIONS  ON  TRANSFER,  A  RIGHT  OF  FIRST  REFUSAL,  AND  A  LOCK-UP
PERIOD  IN  THE  EVENT  OF  A  PUBLIC  OFFERING  HELD  BY  THE  ISSUER  OR  ITS
ASSIGNEE(S)  AS  SET  FORTH  IN  THE  RESTRICTED  STOCK  GRANT  AGREEMENT
BETWEEN  THE  ISSUER  AND  THE  ORIGINAL  HOLDER  OF  THESE  SHARES,  A  COPY
OF  WHICH  MAY  BE  OBTAINED  AT  THE  PRINCIPAL  OFFICE  OF  THE  ISSUER.  SUCH
TRANSFER RESTRICTIONS, RIGHT OF FIRST REFUSAL AND LOCK-UP PERIOD ARE
BINDING ON TRANSFEREES OF THESE SHARES.

THE  SHARES  REPRESENTED  BY  THIS  CERTIFICATE  HAVE  NOT  BEEN  REGISTERED
UNDER THE SECURITIES ACT OF 1933, AS AMENDED, AND HAVE BEEN ACQUIRED
FOR  INVESTMENT  AND  NOT  WITH  A  VIEW  TO,  OR  IN  CONNECTION  WITH,  THE
SALE OR DISTRIBUTION THEREOF. NO TRANSFER MAY BE EFFECTED WITHOUT AN
EFFCTIVE  REGISTRATION  STATEMENT  RELATED  THERETO  OR  AN  OPINION  OF
COUNSEL IN A FORM REASONABLY SATISFACTORY TO THE COMPANY THAT SUCH
REGISTRATION  IS  NOT  REQUIRED  UNDER  THE  SECURITIES  ACT  OF  1933,  AS
AMENDED.

Stop-Transfer Notices.  Grantee  agree  that  to  ensure  compliance  with  the  restrictions  referred  to  herein,  the
Company may issue appropriate “stop transfer” instructions to its transfer agent, if any, and that, if the Company transfers its own securities,
it may make appropriate notations to the same effect in its own records.

B.

Refusal to Transfer. The Company shall not be required (i) to transfer on its books any Shares that have been
sold or otherwise transferred in violation of any of the provisions of this Agreement or (ii) to treat as owner of such Shares or to accord the
right to vote or pay dividends to any acquirer or other transferee to whom such Shares shall have been so transferred

C.

D.

Lock-Up Period.  Grantee  hereby  agree  that  Grantee  shall  not  sell,  offer,  pledge,  contract  to  sell,  grant  any
option or contract to purchase, purchase any option or contract to sell, grant any right or warrant to purchase, lend or otherwise transfer or
encumber,  directly  or  indirectly,  any  Shares  or  other  securities  of  the  Company,  nor  shall  Grantee  enter  into  any  swap,  hedging  or  other
arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of any Shares or other securities
of the Company, during the period from the filing of the first registration statement of the Company filed under the Securities Act of 1933, as
amended (the “Securities Act”), that includes securities to be sold on behalf of the Company to the public in an underwritten public offering
under the Securities Act through the end of the 180-day period following the effective date of such registration statement (or such other

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

2

 
period  as  may  be  requested  by  the  Company  or  the  underwriters  to  accommodate  regulatory  restrictions  on  (i)  the  publication  or  other
distribution  of  research  reports  and  (ii)  analyst  recommendations  and  opinions,  including,  but  not  limited  to,  the  restrictions  contained  in
NASD  Rule  2711(f)(4)  or  NYSE  Rule  472(f)(4),  or  any  successor  provisions  or  amendments  thereto).  The  obligations  described  in  this
section  shall  not  apply  to  a  registration  relating  solely  to  employee  benefit  plans  on  Form  S-1  or  Form  S-8  or  similar  forms  that  may  be
promulgated  in  the  future,  or  a  registration  relating  solely  to  a  transaction  on  Form  S-4  or  similar  forms  that  may  be  promulgated  in  the
future.  Grantee  further  agree,  if  so  requested  by  the  Company  or  any  representative  of  its  underwriters,  to  enter  into  such  underwriter’s
standard form of “lockup” or “market standoff” agreement in a form satisfactory to the Company and such underwriter. The Company may
impose stop-transfer instructions with respect to securities subject to the foregoing restrictions until the end of any such restriction period.

4.

Company’s  Right  of  First  Refusal.  Before  any  Shares  acquired  by  the  Grantee  pursuant  to  this  Agreement  (or  any
beneficial interest in such Shares) may be sold, transferred, encumbered or otherwise disposed of in any way (whether by operation of law or
otherwise) by the Grantee or any subsequent transferee (each a “Holder”), such Holder must first offer such Shares or beneficial interest to
the Company and/or its assignee(s) as follows:

A.

Notice  of  Proposed  Transfer.  The  Holder  shall  deliver  to  the  Company  a  written  notice  stating:  (i)  the
Holder’s bona fide intention to sell or otherwise transfer the Shares; (ii) the name of each proposed transferee; (iii) the number of Shares to
be transferred to each proposed transferee; (iv) the bona fide cash price or other consideration for which the Holder proposes to transfer the
Shares; and (v) that by delivering the notice, the Holder offers all such Shares to the Company and/or its assignee(s) pursuant to this section
and on the same terms described in the notice.

Exercise  of  Right  of  First  Refusal.  At  any  time  within  30  days  after  receipt  of  the  Holder’s  notice,  the
Company and/or its assignee(s) may, by giving written notice to the Holder, elect to purchase all, but not less than all, of the Shares proposed
to be transferred to any one or more of the proposed transferees, at the purchase price determined in accordance with Section 4.C.

B.

Purchase Price.  The  purchase  price  for  the  Shares  purchased  by  the  Company  and/or  its  assignee(s)  under
this section shall be the price listed in the Holder’s notice. If the price listed in the Holder’s notice includes consideration other than cash, the
cash equivalent value of the non-cash consideration shall be determined by the Board of Directors of the Company in its sole discretion.

C.

D.

Payment. Payment of the purchase price shall be made, at the option of the Company and/or its assignee(s),
in cash (by check), by cancellation of all or a portion of any outstanding indebtedness of the Holder to the Company and/or its assignee(s), or
by any combination thereof within 30 days after receipt by the Company of the Holder’s notice (or at such later date as is called for by such
notice).

Holder’s Right to Transfer. If all of the Shares proposed in the notice to be transferred to a given proposed
transferee are not purchased by the Company and/or its assignee(s) as provided in this section, then the Holder may sell or otherwise transfer
such Shares to that

E.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

3

 
 
proposed transferee; provided that: (i) the transfer is made only on the terms provided for in the notice, with the exception of the purchase
price, which may be either the price listed in the notice or any higher price; (ii) such transfer is consummated within 60 days after the date
the notice is delivered to the Company; (iii) the transfer is effected in accordance with any applicable securities laws, and if requested by the
Company, the Holder shall have delivered an opinion of counsel acceptable to the Company to that effect; and (iv) the proposed transferee
agrees in writing to receive and hold the Shares so transferred subject to all of the provisions of this Agreement, including but not limited to
this section, and there shall be no further transfer of such Shares except in accordance with the terms of this section. If any Shares described
in a notice are not transferred to the proposed transferee within the period provided above, then before any such Shares may be transferred, a
new notice shall be given to the Company, and the Company and/or its assignees shall again be offered the right of first refusal described in
this section.

F.

Exception for Certain Family Transfers. Notwithstanding anything to the contrary contained elsewhere in this
section, the transfer of any or all of the Shares during the Holder’s lifetime or on the Holder’s death by will or intestacy to (i) the Holder’s
spouse;  (ii)  the  Holder’s  lineal  descendants  or  antecedents,  siblings,  aunts,  uncles,  cousins,  nieces  and  nephews  (including  adoptive
relationships and step relationships), and their spouses; (iii) the lineal descendants or antecedents, siblings, cousins, aunts, uncles, nieces and
nephews  of  Holder’s  spouse  (including  adoptive  relationships  and  step  relationships),  and  their  spouses;  and  (iv)  a  trust  or  other  similar
estate planning vehicle for the benefit of the Holder or any such person, shall be exempt from the provisions of this section; provided that, in
each  such  case,  the  transferee  agrees  in  writing  to  receive  and  hold  the  Shares  so  transferred  subject  to  all  of  the  provisions  of  this
Agreement, including but not limited to this section, and there shall be no further transfer of such Shares except in accordance with the terms
of this section; and provided further, that without the prior written consent of the Company, which may be withheld in the sole discretion of
the Company, no more than three transfers may be made pursuant to this section, including all transfers by the Holder and all transfers by
any transferee.

G.

Termination of Right of First Refusal. The right of first refusal contained in this section shall terminate as to
all Shares acquired hereunder upon the earlier of: (i) the closing date of the first sale of Common Stock of the Company to the general public
pursuant to a registration statement filed with and declared effective by the Securities and Exchange Commission under the Securities Act,
and (ii) the closing date of a Change of Control pursuant to which the holders of the outstanding voting securities of the Company receive
securities of a class registered pursuant to Section 12 of the Securities Exchange Act of 1934, as amended. For purposes of this Agreement, a
“Change of Control” means either: (i) the acquisition of the Company by another entity by means of any transaction or series of related
transactions (including, without limitation, any reorganization, merger or consolidation or stock transfer, but excluding any such transaction
effected  primarily  for  the  purpose  of  changing  the  domicile  of  the  Company),  unless  the  Company’s  stockholders  of  record  immediately
prior to such transaction or series of related transactions hold, immediately after such transaction or series of related transactions, at least
50% of the voting power of the surviving or acquiring entity (provided that  the  sale  by  the  Company  of  its  securities  for  the  purposes  of
raising  additional  funds  shall  not  constitute  a  Change  of  Control  hereunder);  or  (ii)  a  sale  of  all  or  substantially  all  of  the  assets  of  the
Company.

5.

General Provisions.

4

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
rules, of the State of California.

A.

Choice of Law. This Agreement shall be governed by the internal substantive laws, but not the choice of law

B.

Integration.  This  Agreement,  including  all  exhibits  hereto,  represents  the  entire  agreement  between  the
parties with respect to the acquisition of the Shares by the Grantee and supersedes and replaces any and all prior written or oral agreements
regarding  the  subject  matter  of  this  Agreement  including,  but  not  limited  to,  any  representations  made  during  any  interviews,  relocation
discussions or negotiations whether written or oral.

C.

Notices.  Any  notice,  demand,  offer,  request  or  other  communication  required  or  permitted  to  be  given  by
either the Company or the Grantee pursuant to the terms of this Agreement shall be in writing and shall be deemed effectively given the
earlier  of  (i)  when  received,  (ii)  when  delivered  personally,  (iii)  one  business  day  after  being  delivered  by  facsimile  (with  receipt  of
appropriate confirmation), (iv) one business day after being deposited with an overnight courier service or (v) four days after being deposited
in the U.S. mail, First Class with postage prepaid and return receipt requested, and addressed to the parties at the addresses provided to the
Company (which the Company agrees to disclose to the other parties upon request) or such other address as a party may request by notifying
the other in writing.

D.

Successors.  Any  successor  to  the  Company  (whether  direct  or  indirect  and  whether  by  purchase,  merger,
consolidation, liquidation or otherwise) to all or substantially all of the Company’s business and/or assets shall assume the obligations under
this  Agreement  and  agree  expressly  to  perform  the  obligations  under  this  Agreement  in  the  same  manner  and  to  the  same  extent  as  the
Company would be required to perform such obligations in the absence of a succession. For all purposes under this Agreement, the term
“Company”  shall  include  any  successor  to  the  Company’s  business  and/or  assets  which  executes  and  delivers  the  assumption  agreement
described in this section or which becomes bound by the terms of this Agreement by operation of law. Subject to the restrictions on transfer
set forth in this Agreement, this Agreement shall be binding upon Grantee and their heirs, executors, administrators, successors and assigns.

E.

Assignment; Transfers. Except as set forth in this Agreement, this Agreement, and any and all rights, duties
and obligations hereunder, shall not be assigned, transferred, delegated or sublicensed by the Grantee without the prior written consent of the
Company. Any attempt by the Grantee without such consent to assign, transfer, delegate or sublicense any rights, duties or obligations that
arise under this Agreement shall be void. Except as set forth in this Agreement, any transfers in violation of any restriction upon transfer
contained in any section of this Agreement shall be void, unless such restriction is waived in accordance with the terms of this Agreement.

Waiver. Either party’s failure to enforce any provision of this Agreement shall not in any way be construed as
a waiver of any such provision, nor prevent that party from thereafter enforcing any other provision of this Agreement. The rights granted
both parties hereunder are cumulative and shall not constitute a waiver of either party’s right to assert any other legal remedy available to it.

F.

further documents or instruments necessary or reasonably

G.

Grantee Investment Representations and Further Documents. The Grantee agree upon request to execute any

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

5

 
 
desirable  in  the  view  of  the  Company  to  carry  out  the  purposes  or  intent  of  this  Agreement,  including  (but  not  limited  to)  the  applicable
exhibits and attachments to this Agreement.

provisions shall nevertheless remain effective and shall remain enforceable to the greatest extent permitted by law.

H.

Severability.  Should  any  provision  of  this  Agreement  be  found  to  be  illegal  or  unenforceable,  the  other

I.

Rights as Stockholder.  Subject  to  the  terms  and  conditions  of  this  Agreement,  Grantee  shall  have  all  of  the
rights of a stockholder of the Company with respect to the Shares from and after the date that Grantee deliver a fully executed copy of this
Agreement (including the applicable exhibits and attachments to this Agreement) and full payment for the Shares to the Company, and until
such time as Grantee dispose of the Shares in accordance with this Agreement. Upon such transfer, Grantee shall have no further rights as a
holder of the Shares so purchased except (in the case of a transfer to the Company) the right to receive payment for the Shares so purchased
in accordance with the provisions of this Agreement, and Grantee shall forthwith cause the certificate(s) evidencing the Shares so purchased
to be surrendered to the Company for transfer or cancellation.

Adjustment for Stock Split. All references to the number of Shares and the purchase price of the Shares in this
Agreement shall be adjusted to reflect any stock split, stock dividend or other change in the Shares which may be made after the date of this
Agreement.

J.

K.

Reliance  on  Counsel  and  Advisors.  Grantee  acknowledge  that  Wilson  Sonsini  Goodrich  &  Rosati,
Professional Corporation, is representing only the Company in this transaction. Grantee acknowledges that he or she has had the opportunity
to review this Agreement, including all attachments hereto, and the transactions contemplated by this Agreement with his or her own legal
counsel, tax advisors and other advisors. Grantee are relying solely on his or her own counsel and advisors and not on any statements or
representations of the Company or its agents for legal or other advice with respect to this investment or the transactions contemplated by this
Agreement.

Counterparts. This Agreement may be executed in one or more counterparts, each of which will be deemed
an original, but all of which together will constitute one and the same agreement. Facsimile copies of signed signature pages shall be binding
originals.

L.

(Signature page follows)

6

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

US-DOCS\121842841.2

 
 
The parties represent that they have read this Agreement in its entirety, have had an opportunity to obtain the advice of counsel

prior to executing this Agreement and fully understand this Agreement.

COMPANY:

UNITY BIOTECHNOLOGY, INC.

By:
Name:

Dr. Nathaniel E. David 
Title:President and Chief Executive Officer

[Signature Page to Restricted Stock Grant Agreement]

7

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
The parties represent that they have read this Agreement in its entirety, have had an opportunity to obtain the advice of counsel
prior  to  executing  this  Agreement  and  fully  understand  this  Agreement.  The  Grantee  agrees  to  notify  the  Company  of  any  change  in  its
address below.

GRANTEE:

ASCENTAGE PHARMA GROUP CORP. LTD.

Name:
Title:

Address:

11/F, AXA Centre 
Gloucester Road, 
Wanchai Hong Kong

[Signature Page to Restricted Stock Grant Agreement]

8

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
GRANTEE

COMPANY

SECURITY

AMOUNT

DATE

EXHIBIT A

INVESTMENT REPRESENTATION STATEMENT

ASCENTAGE PHARMA GROUP CORP. LTD.

UNITY BIOTECHNOLOGY, INC.

COMMON STOCK

[●] SHARES

[●]

:

:

:

:

:

In connection with the acquisition of the above-listed shares, I, each of the undersigned, represent to the Company as follows:

1.

The Company may rely on these representations. I understand that the Company’s sale of the shares to me has not been
registered  under  the  Securities  Act  of  1933,  as  amended  (the  “Securities  Act”),  because  the  Company  believes,  relying  in  part  on  my
representations  in  this  document,  that  an  exemption  from  such  registration  requirement  is  available  for  such  sale.  I  understand  that  the
availability of this exemption depends upon the representations I am making to the Company in this document being true and correct.

2.

I  am  purchasing  for  investment.  I  am  purchasing  the  shares  solely  for  investment  purposes,  and  not  for  further
distribution. My entire legal and beneficial ownership interest in the shares is being acquired and shall be held solely for my account, except
to the extent I intend to hold the shares jointly with my spouse. I am not a party to, and do not presently intend to enter into, any contract or
other arrangement with any other person or entity involving the resale, transfer, grant of participation with respect to or other distribution of
any  of  the  shares.  My  investment  intent  is  not  limited  to  my  present  intention  to  hold  the  shares  for  the  minimum  capital  gains  period
specified under any applicable tax law, for a deferred sale, for a specified increase or decrease in the market price of the shares, or for any
other fixed period in the future.

3.

I  can  protect  my  own  interests.  I  can  properly  evaluate  the  merits  and  risks  of  an  investment  in  the  shares  and  can
protect my own interests in this regard, whether by reason of my own business and financial expertise, the business and financial expertise of
certain professional advisors unaffiliated with the Company with whom I have consulted, or my preexisting business or personal relationship
with the Company or any of its officers, directors or controlling persons.

4.

I am informed about the Company. I am sufficiently aware of the Company’s business affairs and financial condition to
reach an informed and knowledgeable decision to acquire the shares. I have had opportunity to discuss the plans, operations and financial
condition  of  the  Company  with  its  officers,  directors  or  controlling  persons,  and  have  received  all  information  I  deem  appropriate  for
assessing the risk of an investment in the shares.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
5.

I recognize my economic risk. I  realize  that  the  acquisition  of  the  shares  involves  a  high  degree  of  risk,  and  that  the
Company’s future prospects are uncertain. I am able to hold the shares indefinitely if required, and  am  able  to  bear  the  loss  of  my  entire
investment in the shares.

6.

I  know  that  the  shares  are  restricted  securities.  I  understand  that  the  shares  are  “restricted  securities”  in  that  the
Company’s sale of the shares to me has not been registered under the Securities Act in reliance upon an exemption for non-public offerings.
In this regard, I also understand and agree that:

Securities Act, or unless an exemption from registration is otherwise available (such as Rule 144);

A.

I  must  hold  the  shares  indefinitely,  unless  any  subsequent  proposed  resale  by  me  is  registered  under  the

B.

C.

the Company is under no obligation to register any subsequent proposed resale of the shares by me; and

the certificate evidencing the shares will be imprinted with a legend which prohibits the transfer of the shares

unless such transfer is registered or such registration is not required in the opinion of counsel for the Company.

7.

I  am  familiar  with  Rule  144.  I  am  familiar  with  Rule  144  adopted  under  the  Securities  Act,  which  in  some
circumstances  permits  limited  public  resales  of  “restricted  securities”  like  the  shares  acquired  from  an  issuer  in  a  non-public  offering.  I
understand that my ability to sell the shares under Rule 144 in the future is uncertain, and may depend upon, among other things: (i) the
availability  of  certain  current  public  information  about  the  Company;  (ii)  the  resale  occurring  more  than  a  specified  period  after  my
acquisition and full payment (within the meaning of Rule 144) for the shares; and (iii) if I am an affiliate of the Company (A) the sale being
made in an unsolicited “broker’s transaction”, transactions directly with a market maker or riskless principal transactions, as those terms are
defined  under  the  Securities  Exchange  Act  of  1934,  as  amended,  (B)  the  amount  of  shares  being  sold  during  any  three-month  period  not
exceeding the specified limitations stated in Rule 144, and (C) timely filing of a notice of proposed sale on Form 144, if applicable.

8.

I know that Rule 144 may never be available. I understand that the requirements of Rule 144 may never be met, and
that the shares may never be saleable under the rule. I further understand that at the time I wish to sell the shares, there may be no public
market for the Company’s stock upon which to make such a sale, or the current public information requirements of Rule 144 may not be
satisfied, either of which may preclude me from selling the shares under Rule 144 even if the relevant holding period had been satisfied.

9.

I know that I am subject to further restrictions on resale. I understand that in the event Rule 144 is not available to me,
any future proposed sale of any of the shares by me will not be possible without prior registration under the Securities Act, compliance with
some  other  registration  exemption  (which  may  or  may  not  be  available),  or  each of  the  following:  (i)  my  written  notice  to  the  Company
containing detailed information regarding the proposed sale, (ii) my providing an opinion of my counsel to the effect that such sale will not
require registration, and (iii) the Company notifying me in writing that its counsel concurs in such opinion. I understand

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

2

 
that  neither  the  Company  nor  its  counsel  is  obligated  to  provide  me  with  any  such  opinion.  I  understand  that  although  Rule  144  is  not
exclusive, the Staff of the SEC has stated that persons proposing to sell private placement securities other than in a registered offering or
pursuant to Rule 144 will have a substantial burden of proof in establishing that an exemption from registration is available for such offers or
sales, and that such persons and their respective brokers who participate in such transactions do so at their own risk.

10.

I know that I may have tax liability due to the uncertain value of the shares. I understand that the Board of Directors
believes its valuation of the shares represents a fair appraisal of their worth, but that it remains possible that, with the benefit of hindsight, the
Internal Revenue Service may successfully assert that the value of the shares on the date of my acquisition is substantially greater than the
Board’s appraisal. I understand that any additional value ascribed to the shares by such an IRS determination will constitute ordinary income
to me as of the acquisition date, and that any additional taxes and interest due as a result will be my sole responsibility payable only by me,
and that the Company need not and will not reimburse me for that tax liability.

11.

Non-U.S. Investor. If I am not a United States person, I hereby represents that I am satisfied as to the full observance of
the laws of my jurisdiction in connection with any invitation to receive the shares issuable pursuant to this Agreement, or any use of this
Agreement, including (i) the legal requirements within my jurisdiction for the acquisition of the shares pursuant to this Agreement, (ii) any
foreign exchange restrictions applicable to such receipt or transfer, (iii) any governmental or other consents that may need to be obtained and
(iv) the income tax and other tax consequences, if any, that may be relevant to the acquisition, holding, redemption, sale or transfer of such
securities. My subscription for, and my continued beneficial ownership of the shares will not violate any applicable securities or other laws
of my jurisdiction.

12.

Principal Place of Business. The address of my principal place of business is set forth on the signature page below.

By  signing  below,  the  undersigned  acknowledge  their  agreement  with  each  of  the  statements  contained  in  this  Investment
Representation Statement as of the date first set forth above, and their intent for the Company to rely on such statements in issuing the shares
to me.

ASCENTAGE PHARMA GROUP CORP. LTD.

Address of Grantee’ Principal Place of Business:

11/F AXA Centre 
Gloucester Road, Wanchai 
Hong Kong

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

3

 
 
 
FIRST AMENDMENT TO APG1252 LICENSE AGREEMENT

Exhibit 10.17

This  Amendment  (the  “Amendment”),  dated  as  of  March  28,  2018  (the  Amendment  Effective  Date”)  is  made  by  and  between  Ascentage
Pharma Group Corp. Ltd., a Hong Kong corporation (“Ascentage”), with a business address at 11/F, AXA CENTRE, Gloucester Road, Wanchai, Hong
Kong, and Unity Biotechnology, Inc., a Delaware corporation (“Unity”), with a business address at 3280 Bayshore Blvd, Suite 100, Brisbane, California
95002.  Ascentage and Unity are sometimes referred to herein as individually as a “Party” and collectively as the “Parties”.

BACKGROUND

A.

The  Parties  entered  into  a  Compound  Library  and  Option  Agreement  (the  “Library  Agreement”)  dated  February  2,  2016  (the
“Original Effective Date”), which granted Unity the right to screen Ascentage’s collection of BCL-2/BCL-xL inhibitor compounds as well as additional
BCL-2/BCL-xL  inhibitor  compounds  discovered  by  Ascentage  during  the  term  of  the  Library  Agreement,  including  pursuant  to  that  certain  Research
Services Agreement between the Parties dated February 2, 2016 (collectively, the “BCL Compounds”) to identify compounds with potential utility in the
treatment  of  age-related  conditions  other  than  Oncology  Indications.  Defined  terms  used  herein  and  not  otherwise  defined  shall  have  the  meanings
ascribed in the Library Agreement.

B.

 On the Original Effective Date the Parties also entered the APG1252 License Agreement (the “1252 License Agreement”) pursuant
to  which  Ascentage  granted  Unity  exclusive  rights  to  a  BCL  Compound  known  as  APG-1252  for  the  prophylaxis  and  treatment  of,  and  palliation  of
symptoms associated with, age related indications other than Oncology Indications.  

C.

Ascentage is also a party to a License Agreement with the Regents of the University of Michigan (“Michigan”) dated December 1,
2010 (as amended on May 30, 2013, February 2, 2016, May 10, 2017 and June 1, 2017, the “Michigan License Agreement”), pursuant to which Michigan
granted Ascentage exclusive rights, with the right to sublicense, under certain Michigan patents which cover, among other things, the BCL Compounds.

D.

The  Michigan  License  Agreement  provides  for  Ascentage  to  pay  Michigan  twenty  percent  (20%)  of  Ascentage’s  Gross
Sublicensing  Revenues  (as  defined  therein)  and  further  provides  that  in  the  event  a  portion  of  Gross  Sublicensing  Revenues  includes  non-cash
consideration, the relevant Ascentage sublicensee shall be required to issue such non-cash consideration directly to Michigan.

E.

Each of the Library Agreement and the 1252 License Agreement provided for certain payments to be made by Unity to Ascentage
in  the  form  of  shares  of  Unity  common  stock  including  (i)  in  each  case,  an  upfront  payment  that  was  due  within  [***]  ([***])  days  of  the  Original
Effective Date (the “Upfront Equity Payments”), and (ii) in the case of the 1252 License Agreement, additional payments upon the achievement of certain
development milestones (the “Milestone Equity Payments” and, together with the Upfront Equity Payments, the “Unity Equity Payments”)

F.

Pursuant  to  the  terms  of  the  Michigan  License  Agreement  (i)  twenty  percent  (20%)  of  each  Unity  Equity  Payment  is  owed  by

Ascentage to Michigan as a sublicense fee, and (ii) Ascentage is required to cause Unity to issue such Unity Equity Payments directly to Michigan.  

G.

On  or  around  the  Original  Effective  Date,  in  order  to  enable  Ascentage  to  satisfy  its  sublicense  fee  payment  obligations  to

Michigan with respect to the Upfront Equity Payments, the Parties

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

1

 
 
 
 
 
 
 
 
 
 
agreed that Unity should issue twenty percent (20%) of the Upfront Equity Payments directly to Michigan.  Therefore, Unity bifurcated its issuance of the
Upfront Equity Payments and issued eighty percent (80%) of the shares of common stock to Ascentage and twenty percent (20%) portion of the shares of
common stock to Michigan.  A schedule of the Upfront Equity Payments that were due and made to each party is set forth on Exhibit A hereto.

H.

The Parties now wish to set forth and document their understanding and agreement about the manner in which the Upfront Equity
Payments  were  made  as  well  as  the  manner  in  which  any  additional  Milestone  Equity  Payments  will  be  made  in  connection  under  the  1252  License
Agreement.  Except as expressly modified hereby, the 1252 License Agreement shall continue in full force according to its terms.

NOW, THEREFORE, for and in consideration of the covenants, conditions and undertakings hereinafter set forth, it is agreed by and between

the Parties as follows:

1.

Upfront Equity Payments.

AGREEMENT

On February 17, 2016, pursuant to Restricted Stock Grant Agreement, Unity granted Ascentage a total of 1,573,340 shares of
Unity common stock, of which 1,258,672 shares represented Ascentage’s eighty percent (80%) portion of the Upfront Equity Payment due under the 1252
License Agreement.

(a)

On  February  17,  2016,  pursuant  to  a  separate  Restricted  Stock  Grant  Agreement,  Unity  granted  Michigan  a  total  393,335
shares of Unity common stock, of which 314,668 shares represented Michigan’s twenty percent (20%) portion of the Upfront Equity Payment due under
the 1252 License Agreement.

(b)

(c)

 Ascentage acknowledges and agrees that (i) the Upfront Equity Payment to Michigan described in Section 1(b) above was
made  by  Unity  on  behalf  of  Ascentage  in  order  to  satisfy  Ascentage’s  obligation  to  make  sublicense  fee  payments  to  Michigan  under  the  Michigan
License  Agreement,  (ii)  that  the  Upfront  Equity  Payment  to  Ascentage  described  in  Section  1(a)  represented  the  full  balance  of  the  Upfront
Equity  Payments owed to Ascentage, and (iii) therefore Unity has fully and completely satisfied and discharged its obligation to make the Upfront Equity
Payment due under the 1252 License Agreement.  

2.

Milestone Equity Payments. To address the fact that Unity will be required to issue twenty percent (20%) of each Milestone Equity
Payment directly to Michigan to satisfy Ascentage’s sublicense fee payment obligation to Michigan under the Michigan License Agreement, the Parties
hereby agree to make the amendments set forth below to the 1252 License Agreement.

(a)

Section 5.1.2 is hereby amended in its entirety to read as follows:

5.1.2

[***].  Upon the [***], Unity shall make the following issuances of its common stock:

(a)

Unity shall issue to Ascentage Three Hundred Fourteen Thousand Six Hundred Sixty-Eight (314,668) shares
of Unity common stock (as adjusted for stock splits, reverse stock splits, stock dividends, recapitalizations and the like occurring
after the Original Effective Date and prior to issuance) within [***] ([***]) days of date that [***] occurs.  

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

2

 
 
 
 
 
 
 
 
 
 
 
 
(b)

Unity shall issue to UM Seventy-Eight Thousand Six Hundred Sixty-Seven (78,667) shares of Unity common
stock (as adjusted for stock splits, reverse stock splits, stock dividends, recapitalizations and the like occurring after the Original
Effective Date and prior to issuance) within [***] ([***]) days after the date the shares described in Section 5.1.2(a) are issued
to Ascentage.

(c)

For clarity, [***].

(b)

Section 5.1.3 is hereby amended in its entirety to read as follows:

5.1.3

[***].  Upon the [***], Unity shall the following number of shares of Unity common stock (in each case as adjusted
for stock splits, reverse stock splits, stock dividends, recapitalizations and the like occurring after the Original Effective Date and prior to
issuance) based on how long after the Effective Date such [***].  In the case of Ascentage, such shares shall be issued within [***] ([***])
days of date that such [***] occurs.  In the case of UM, such shares shall be issued within [***] ([***]) days after the shares are issued to
Ascentage.

(a)

If such [***] occurs within [***] ([***]) [***] of the Effective Date then (i) [***] ([***]) shares of common stock (as
adjusted for stock splits, reverse stock splits, stock dividends, recapitalizations and the like occurring after the Original Effective Date and
prior  to  issuance)  to  Ascentage  and  (ii)  [***]  ([***])  shares  of  common  stock  (as  adjusted  for  stock  splits,  reverse  stock  splits,  stock
dividends, recapitalizations and the like occurring after the Original Effective Date and prior to issuance) to UM.

(b)

If such [***] occurs more than [***] ([***]) [***] after the Effective Date but less than [***] ([***]) [***] after the
Effective Date (i) [***] ([***]) shares of common stock (as adjusted for stock splits, reverse stock splits, stock dividends, recapitalizations
and the like occurring after the Original Effective Date and prior to issuance) to Ascentage, and (ii) [***] ([***]) shares of common stock (as
adjusted for stock splits, reverse stock splits, stock dividends, recapitalizations and the like occurring after the Original Effective Date and
prior to issuance) to UM.

(c)

If such [***] occurs more than [***] ([***]) [***] after the Effective Date (i) [***] ([***]) shares to Ascentage and
(ii) [***] ([***]) shares to UM (in each case, as adjusted for stock splits, reverse stock splits, stock dividends, recapitalizations and the like
occurring after the Original Effective Date and prior to issuance) .

3.

Equity Cap.  The Parties further agree that Section 5.1.4 is hereby amended in its entirety to read as follows:

5.1.4

Equity Cap.   Notwithstanding anything in the contrary in this Agreement, the Library Agreement or any Compound
License Agreement(s), the maximum cumulative aggregate number of shares of Unity common stock that Ascentage and UM are collectively
eligible to receive under Sections 6.1 and 6.2 of the Library Agreement, Section 5.1 of any Compound License Agreement(s) and this Section
5.1 is:  

(a)

[***]  ([***])  shares  of  Unity  common  stock  (as  adjusted  for  stock  splits,  reverse  stock  splits,  stock  dividends,

recapitalizations and the like occurring after the Original Effective Date) if only one Licensed Product is developed; and

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

3

 
 
 
 
 
 
 
 
 
 
 
 
(b)

Three  Million  Nine  Hundred  Thirty-Three  Thousand  Three  Hundred  and  Fifty  (3,933,350)  shares  of  Unity  common
stock (as adjusted for stock splits, reverse stock splits, stock dividends, recapitalizations and the like occurring after the Original Effective
Date) if two or more Licensed Products is developed.  

4.

Miscellaneous. This Amendment shall inure to the benefit of and be binding upon the parties and their respective heirs, successors,
trustees, transferees and assigns.  In the event of a conflict between the provisions of this Amendment and the provisions of the Library Agreement, the
provisions  of  this  Amendment  shall  control.    This  Amendment  may  be  executed  in  any  number  of  counterparts,  each  of  which  shall  be  deemed  an
original, but all of which together shall constitute one and the same instrument.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

4

 
 
IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by their authorized representatives and delivered in
duplicate originals as of the Amendment Effective Date.

ASCENTAGE PHARMA GROUP CORP. LTD.

UNITY BIOTECHNOLOGY, INC.

By:/s/ Dajun Yang

Name: Dajun Yang, MD, PhD

Title:  Chief Executive Officer

By: /s/ Keith Leonard

Name:  Keith Leonard

Title:  Chief Executive Officer

Acknowledged By:

THE REGENTS OF THE UNIVERITY OF MICHIGAN

/s/ Kelley B. Sexton

Name: Kelley B. Sexton, Ph.D.

Title:  Associate Vice President for Research, Technology Transfer and Innovation

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

5

 
 
 
 
 
 
 
 
Library Agreement

1252 License Agreement

Totals

Total

393,335

1,573,340

1,966,675

Exhibit A

Upfront Equity Payments

Upfront Equity Payments (# shares)

Ascentage 80%

Michigan 20%

78,667

314,668

393,335

314,668

1,258,672

1,573,340

6

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
 
 
 
 
Exhibit 10.18

FIRST AMENDMENT TO COMPOUND LIBRARY AND OPTION AGREEMENT

This Amendment (the “Amendment”), dated as of March 28, 2018 (the Amendment Effective Date”) is made by and between Ascentage Pharma Group
Corp. Ltd., a Hong Kong corporation (“Ascentage”), with a business address at 11/F, AXA CENTRE, Gloucester Road, Wanchai, Hong Kong, and Unity
Biotechnology, Inc., a Delaware corporation (“Unity”), with a business address at 3280 Bayshore Blvd, Suite 100, Brisbane, California 95002.  Ascentage
and Unity are sometimes referred to herein as individually as a “Party” and collectively as the “Parties”.

BACKGROUND

A.

The  Parties  entered  into  a  Compound  Library  and  Option  Agreement  (the  “Library  Agreement”)  dated  February  2,  2016  (the
“Original Effective Date”), which granted Unity the right to screen Ascentage’s collection of BCL-2/BCL-xL inhibitor compounds as well as additional
BCL-2/BCL-xL  inhibitor  compounds  discovered  by  Ascentage  during  the  term  of  the  Library  Agreement,  including  pursuant  to  that  certain  Research
Services Agreement between the Parties dated February 2, 2016 (collectively, the “BCL Compounds”) to identify compounds with potential utility in the
treatment  of  age-related  conditions  other  than  Oncology  Indications.  Defined  terms  used  herein  and  not  otherwise  defined  shall  have  the  meanings
ascribed in the Library Agreement.

B.

 On the Original Effective Date the Parties also entered that certain APG1252 License Agreement (the “1252 License Agreement”)
pursuant to which Ascentage granted Unity exclusive rights to a BCL Compound known as APG-1252 for the prophylaxis and treatment of, and palliation
of symptoms associated with, age related indications other than Oncology Indications.  

C.

Ascentage is also a party to a License Agreement with the Regents of the University of Michigan (“Michigan”) dated December 1,
2010 (as amended on May 30, 2013, February 2, 2016, May 10, 2017 and June 1, 2017, the “Michigan License Agreement”), pursuant to which Michigan
granted Ascentage exclusive rights, with the right to sublicense, under certain Michigan patents which cover, among other things, the BCL Compounds.

D.

The  Michigan  License  Agreement  provides  for  Ascentage  to  pay  Michigan  twenty  percent  (20%)  of  Ascentage’s  Gross
Sublicensing  Revenues  (as  defined  therein)  and  further  provides  that  in  the  event  a  portion  of  Gross  Sublicensing  Revenues  includes  non-cash
consideration, the relevant Ascentage sublicensee shall be required to issue such non-cash consideration directly to Michigan.

E.

Each of the Library Agreement and the 1252 License Agreement provided for certain payments to be made by Unity to Ascentage
in  the  form  of  shares  of  Unity  common  stock  including  (i)  in  each  case,  an  upfront  payment  that  was  due  within  [***]  ([***])  days  of  the  Original
Effective Date (the “Upfront Equity Payments”), and (ii) in the case of the Library Agreement, additional payments upon Unity’s designation of each of
the first two locally-dosed Development Candidates (the “DC Nomination Equity Payments” and, together with the Upfront Equity Payments, the “Unity
Equity Payments”)

F.

Pursuant  to  the  terms  of  the  Michigan  License  Agreement  (i)  twenty  percent  (20%)  of  each  Unity  Equity  Payment  is  owed  by

Ascentage to Michigan as a sublicense fee, and (ii) Ascentage is required to cause Unity to issue such Unity Equity Payments directly to Michigan.  

G.

On  or  around  the  Original  Effective  Date,  in  order  to  enable  Ascentage  to  satisfy  its  sublicense  fee  payment  obligations  to

Michigan with respect to the Upfront Equity Payments, the Parties

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
 
 
 
 
 
agreed that Unity should issue twenty percent (20%) of the Upfront Equity Payments directly to Michigan.  Therefore, Unity bifurcated its issuance of the
Upfront Equity Payments and issued eighty percent (80%) of the shares of common stock to Ascentage and twenty percent (20%) portion of the shares of
common stock to Michigan.  A schedule of the Upfront Equity Payments that were due and made to each party is set forth on Exhibit A hereto.

H.

The Parties now wish to set forth and document their understanding and agreement about the manner in which the Upfront Equity
Payments  were  made  as  well  as  the  manner  in  which  any  additional  DC  Nomination  Payments  will  be  made  in  connection  under  the  Library
Agreement.  Except as expressly modified hereby, the Library Agreement shall continue in full force according to its terms.

NOW, THEREFORE, for and in consideration of the covenants, conditions and undertakings hereinafter set forth, it is agreed by and between

the Parties as follows:

1.

Upfront Equity Payments.

AGREEMENT

On February 17, 2016, pursuant to Restricted Stock Grant Agreement, Unity granted Ascentage a total of 1,573,340 shares of
Unity  common  stock,  of  which  314,668  shares  represented  Ascentage’s  eighty  percent  (80%)  portion  of  the  Upfront  Equity  Payment  due  under  the
Library Agreement.

(a)

On  February  17,  2016,  pursuant  to  a  separate  Restricted  Stock  Grant  Agreement,  Unity  granted  Michigan  a  total  393,335
shares of Unity common stock, of which 78,667 shares represented Michigan’s twenty percent (20%) portion of the Upfront Equity Payment due under
the Library Agreement.

(b)

(c)

 Ascentage acknowledges and agrees that (i) the Upfront Equity Payment to Michigan described in Section 1(b) above was
made  by  Unity  on  behalf  of  Ascentage  in  order  to  satisfy  Ascentage’s  obligation  to  make  sublicense  fee  payments  to  Michigan  under  the  Michigan
License  Agreement,  (ii)  that  the  Upfront  Equity  Payment  to  Ascentage  described  in  Section  1(a)  represented  the  full  balance  of  the  Upfront
Equity  Payments owed to Ascentage, and (iii) therefore Unity has fully and completely satisfied and discharged its obligation to make the Upfront Equity
Payment due under the Library Agreement.  

2.

DC  Nomination  Equity  Payments.      To  address  the  fact  that  Unity  will  be  required  to  issue  twenty  percent  (20%)  of  each  DC
Nomination  Equity  Payment  directly  to  Michigan  to  satisfy  Ascentage’s  sublicense  fee  payment  obligation  to  Michigan  under  the  Michigan  License
Agreement, the Parties hereby agree to amend Section 6.2 of the Library Agreement in its entirety to read as follows:

6.2

First  Locally-Dosed  Licensed  Compounds.    Upon  Unity’s  designation  of  each  of  the  first  two  (2)  locally-dosed
Development  Candidates,  Unity  shall  make  the  following  issuances  of  its  common  stock  (in  each  case  as  adjusted  for  stock  splits,  reverse
stock splits, stock dividends, recapitalizations and the like occurring after the Original Effective Date and prior to issuance):

6.2.1

Unity  shall  issue  to  Ascentage  Three  Hundred  Fourteen  Thousand  Six  Hundred  Sixty-Eight  (314,668)
shares  of  Unity  common  stock  (as  adjusted  for  stock  splits,  reverse  stock  splits,  stock  dividends,  recapitalizations  and  the  like
occurring after the Original Effective Date and prior to issuance), for each locally dosed Development Candidate; such shares to
be  issued  to  Ascentage  pursuant  to  the  Stock  Agreement  within  [***]  ([***])  days  of  date  a  Compound  License  Agreement  is
executed with respect to such Development Candidate.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

2

 
 
 
 
 
 
 
 
 
 
 
6.2.2

Unity  shall  issue  to  UM  Seventy-Eight  Thousand  Six  Hundred  Sixty-Seven  (78,667)  shares  of  Unity
common stock (as adjusted for stock splits, reverse stock splits, stock dividends, recapitalizations and the like occurring after the
Original  Effective  Date  and  prior  to  issuance),  for  each  locally  dosed  Development  Candidate;  such  shares  to  be  issued  to
Michigan within [***] ([***]) days after the date the shares described in Section 6.2.1 are issued to Ascentage.

3.

Equity Cap.  The Parties further agree that Section 6.3 is hereby amended in its entirety to read as follows:

6.3

Equity  Cap.      Notwithstanding  anything  in  the  contrary  in  this  Agreement,  any  Compound  License  Agreement  or  the
APG-1252  License  Agreement,  the  maximum  cumulative  aggregate  number  of  shares  of  Unity  common  stock  that  Ascentage  and  UM  are
collectively eligible to receive under Sections 6.1 and 6.2 of this Agreement, Section 5.1 of all Compound License Agreements and Section 5.1
of the APG-1252 License Agreement is:  

(a)

[***]  ([***])  shares  of  Unity  common  stock  (as  adjusted  for  stock  splits,  reverse  stock  splits,  stock  dividends,
recapitalizations and the like occurring after the Original Effective Date and prior to issuance) if only one Licensed Product is developed;
and

(b)

Three  Million  Nine  Hundred  Thirty-Three  Thousand  Three  Hundred  and  Fifty  (3,933,350)  shares  of  Unity  common
stock (as adjusted for stock splits, reverse stock splits, stock dividends, recapitalizations and the like occurring after the Original Effective
Date and prior to issuance) if two or more Licensed Products is developed.  

4.

Miscellaneous. This Amendment shall inure to the benefit of and be binding upon the parties and their respective heirs, successors,
trustees, transferees and assigns.  In the event of a conflict between the provisions of this Amendment and the provisions of the Library Agreement, the
provisions  of  this  Amendment  shall  control.    This  Amendment  may  be  executed  in  any  number  of  counterparts,  each  of  which  shall  be  deemed  an
original, but all of which together shall constitute one and the same instrument.

[Remainder of page left blank intentionally]

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

3

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be duly executed by their authorized representatives and delivered in
duplicate originals as of the Amendment Effective Date.

ASCENTAGE PHARMA GROUP CORP. LTD.

UNITY BIOTECHNOLOGY, INC.

By:/s/ Dajun Yang

Name: Dajun Yang, MD, PhD

Title:  Chief Executive Officer

By: /s/ Keith Leonard

Name:  Keith Leonard

Title:  Chief Executive Officer

Acknowledged By:

THE REGENTS OF THE UNIVERITY OF MICHIGAN

/s/ Kelley B. Sexton

Name: Kelley B. Sexton, Ph.D.

Title:  Associate Vice President for Research, Technology Transfer and Innovation

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit A

Upfront Equity Payments

Library Agreement

1252 License Agreement

Totals

Total

393,335

1,573,340

1,966,675

Upfront Equity Payments (# shares)

Ascentage 80%

Michigan 20%

314,668

1,258,672

1,573,340

78,667

314,668

393,335

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
 
 
 
 
EXCLUSIVE LICENSE AGREEMENT

Exhibit 10.19A

This License Agreement ("Agreement") is made as is made as of the 28th day of June, 2013 (the "Effective Date") by and

between the Mayo Foundation for Medical Education and Research, having its principal place of business at 200 First Street SW, Rochester,
MN 55905("Mayo"), and Cenexys, Inc., a Delaware corporation, having a place of business at 1700 Owens St., Suite 535,
San Francisco, CA 94158 ("Company").

Mayo owns certain Patent Rights and Know-How (each as defined below);

BACKGROUND

Company desires to obtain a license from Mayo to the Patent Rights and Know-How, all on the terms and conditions set

A.

B.

forth below; and

C.

Company and Mayo further intend to enter into a Research Agreement pursuant to which Company will fund certain

research conducted in the laboratories of Drs. Jan Van Deursen and James Kirkland at Mayo (the "Research Agreement").

D.

Company similarly intends to enter into a research agreement with the Buck Institute for Research on Aging ("Buck

Institute") pursuant to which Company will fund certain research conducted in the laboratories of Dr. Judy Campisi (“Buck Research
Agreement”) in exchange for the right to license any resulting inventions and certain additional inventions of Buck Institute that exist as of
the Effective Date ("Buck Inventions") under a license agreement to be entered into by Company and Buck Institute ("Buck License
Agreement").

NOW, THEREFORE, in consideration of the mutual covenants and promises herein contained, the parties hereto agree as follows:

ARTICLE 1

DEFINITIONS

As used in this Agreement, the following capitalized terms shall have the meanings indicated:

1.1

"Additional Inventions" shall mean discoveries and inventions that (i) are necessary or useful for the development,

manufacture or commercialization of Licensed Products within the Field, and (ii) are developed in the laboratories of Drs. Jan Van Deursen,
James Kirkland and/or Darren Baker at Mayo during the IP Capture Period, excluding inventions generated pursuant to the Research
Agreement and subject to the terms thereof.

1.2

"Affiliate" shall mean any entity which controls, is controlled by or is under common control with Company.  An entity

shall be regarded as in control of another entity for

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

1

 
 
purposes of this definition if it owns or controls more than fifty percent (50%) of the shares of the subject entity entitled to vote in the
election of directors (or, in the case of an entity that is not a corporation, for the election of the corresponding managing authority). For
Mayo, “Affiliate” shall mean  any corporation or other entity within the same “controlled group of corporations” as Mayo or its parent Mayo
Clinic.  For purposes of this definition, the term “controlled group of corporations” will have the same definition as Section 1563 of the
Internal Revenue Code as of November 10, 1998, but will include corporations or other entities which if not a stock corporation, more than
fifty percent (50%) of the board of directors or other governing body of such corporation or other entity is controlled by a corporation within
the controlled group of corporations of Mayo or Mayo Clinic.  Mayo’s Affiliates include, but are not limited to: Mayo Clinic; Mayo
Collaborative Services, Inc.; Mayo Clinic - Methodist Hospital; Mayo Clinic - Saint Marys Hospital; Mayo Clinic Florida; Mayo Clinic
Arizona; and its Mayo Clinic Health System entities.

1.3

"Buck Know-how" shall mean unpatented technical information, know-how, processes, procedures, compositions,

devices, methods, techniques, data or other subject matter that is licensed to Company under the Buck License Agreement.

1.4

"Buck Know-how Product" shall mean a product, composition or material for use in the Field that (a) incorporates
Buck Know-How or whose discovery or development was enabled by Company’s use of Buck Know-How and (b) is not a Buck Patent
Product.

1.5

1.6

License Agreement.

“Buck Licensed Product” shall mean a Buck Patent Product or Buck Know-How Product.

"Buck Patent Rights" shall mean patent and patent applications exclusively licensed to Company under the Buck

1.7

"Buck Patent Product" shall mean a product, composition, or material for use in the Field (i) the manufacture, sale or

use of which would but for the license granted herein, infringe a Valid Claim of the Buck Patent Rights, or (ii) whose discovery or
development was enabled by Company’s use of a Buck Proprietary Research Tool (“Buck Tool Products”)

1.8

"Buck Proprietary Research Tool" shall mean a Research Tool that has been designated as a Proprietary Research Tool

under the Buck License Agreement and exclusively licensed to Company.

1.9

1.10

"Buck Proprietary Research Tool Patent" Buck Patent Rights claiming the Buck Proprietary Research Tools.

"Field" shall mean the (a) prophylaxis , treatment, modulation or palliation of diseases or conditions through (i) the

clearance or killing of senescent cells, or (ii) the inhibition or modulation of the deleterious effects of senescent cells, and (b) the prediction,
diagnosis, monitoring and tracking of diseases or conditions being prevented, treated, modulated or inhibited pursuant to subsection (a)
above.  

1.11

"IP Capture Period" shall mean the period commencing on [***] and continuing until [***].

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

2

1.12

"Know-How" shall mean unpatented technical information, know-how, processes, procedures, compositions, devices,

methods, techniques, data or other subject matter that is owned or controlled by Mayo that is useful for the discovery, development or
commercialization of Licensed Products.

1.13

"Know-How Product" shall mean a product, composition or material for use in the Field that (a) incorporates Know-

How or whose discovery or development was enabled by Company’s use of Know-How and (b) is not a Patent Product.

1.14

1.15

"Licensed Product" shall mean a Patent Product or Know-How Product.  

"Licensed Subject Matter" shall mean the Patent Rights and the Know-How.

1.16

"Net Sales" shall mean the total amount invoiced to third parties on sales of Licensed Products by Company, its
Affiliates, or Sublicensees, for which royalties are due under Article 3 below, less the following reasonable and customary deductions
actually given:  (i) all trade, cash and quantity credits, discounts, refunds or government rebates; (ii) amounts for claims, allowances or
credits for returns, retroactive price reductions, or chargebacks; (iii) packaging, handling fees and prepaid freight, sales taxes, duties and
other governmental charges (including value added tax) shown on the face of the  invoice; and (iv) provisions for uncollectible accounts
determined in accordance with US GAAP, consistently applied to all products of the selling party, provided that in no event shall  deductions
for uncollectible accounts in any annual period exceed [***] percent ([***]%) of the cumulative Net Sales in such annual period. In the
event that Company and a third party enter into a barter transaction pursuant to which Company transfers Licensed Products to such third
party in exchange for non-cash consideration provided in lieu of cash, then Net Sales shall be calculated based on the value of the non-cash
consideration received, provided that in no event shall the transferred Licensed Products be valued at more than the then-current customary
sales price for such Licensed Products invoiced to third parties or fair market value if there are no current invoices to third parties. For the
removal of doubt, Net Sales shall not include sales by Company to its Affiliates for resale, provided that if Company transfers Licensed
Products to an Affiliate, and the Affiliate retransfers the Licensed Products to third-party purchaser, then Net Sales shall be the price charged
by the Affiliate to third-party purchaser, less documented allowable deductions.

In the event that Company grants a sublicense hereunder, and receives payments based upon the Sublicensee's sales of Licensed
Products, Company may upon receiving consent from Mayo, which consent shall not be unreasonably withheld, substitute the definition of
"Net Sales," used by the Sublicensee to calculate payments to Company in place of the foregoing definition of "Net Sales" for purposes of
calculating royalties payable to Mayo on such Sublicensee's sales.

1.17

"Net Sublicensing Income" shall mean cash income (or any other consideration received  in lieu of a cash payment,

including, without limitation, securities, materials and equipment) received from a Sublicensee in consideration of the grant to such
Sublicensee of a sublicense under the Patent Rights, but excluding earned royalties and any other share of net sales (including revenue
sharing and profit payments that would otherwise be reflected in net sales) for the sale or distribution of Licensed Products.  Net
Sublicensing Income shall include without limitation any license signing fee, license maintenance fee, or milestone payment, and

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

3

any consideration received for an investment in equity (and conditional equity, such as warrants, convertible debt) of Company to the extent
such consideration exceeds the fair market value of such equity or other conditional equity.  Not included in the definition of Net
Sublicensing Income is income received by Company (a) as bona fide loans; (b) from equity investments (and conditional equity, such as
warrants, convertible debt) in Company at market value; (c) as reimbursements for actual documented patent prosecution costs and patent
maintenance expenses; (d) as payment or reimbursement for research and development and/or other services conducted by or for Company,
including costs of materials, equipment, manufacturing services or clinical testing, e.g., provided on the basis of full-time equivalent (“FTE”)
efforts of personnel at or below commercially reasonable and standard FTE rates (“FTE Reimbursements”) and/or the reimbursement of out-
of-pocket expenses; and (g) income to Company from a Sublicensee for commercial manufacturing of goods if such goods are intended for
resale to third parties and the revenue derived from sales of such goods will be treated as Net Sales and subject to an earned royalty due to
Mayo. In addition, Company shall have the right to deduct from Net Sublicensing Income (i) withholding taxes and other taxes, duties and
similar amounts owing with respect to payments included within Net Sublicensing Income, but excluding what are commonly referred to as
income taxes, and (ii) Eligible Expenses.  As used herein, “Eligible Expenses” means (A) the documented costs and expenses reasonably
incurred by Company in performing responsibilities with respect to Licensed Products specifically in connection with a sublicense to the
Patent Rights with a Sublicensee, including FTE Reimbursements and out of pocket costs, or in performing research, development, and/or
manufacture of Licensed Products in connection with such sublicense; and (B) a reasonable reserve for the costs and expenses that the
Company  has agreed to incur in a sublicense, but has not yet incurred, in the performance of its responsibilities under such agreement with a
Sublicensee (“Future Expenses”), provided that any estimated costs are clearly identified by Company and are accompanied by supporting
documentation.

1.18

"Patent Product" shall mean a product , composition, or material for use in the Field (i) the manufacture, sale or use of

which would but for the license granted herein, infringe a Valid Claim of the Patent Rights, or (ii) whose discovery or development was
enabled by Company’s use of a Proprietary Research Tool (“Tool Products”).  

1.19

"Patent Rights" shall mean any and all rights in and to:

patent(s) and patent application(s) listed in Exhibit A hereto as of the Effective Date (the "Existing Patents");

(a)

all worldwide patent and patent applications claiming or disclosing subject matter claimed or disclosed in the

the Company exercises its option thereunder (“Research Agreement Patents”);

(b)

all patents and patent applications claiming inventions developed pursuant to Research Agreement for which

(c)

all patents and patent applications claiming Additional Inventions with respect to which Company exercised

its option pursuant to Section 2.2 (“Additional Invention Patents”); and
4

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

(d)

all divisions, continuations, continuations-in-part (but only for subject matter supported pursuant to 35

U.S.C. §112 by the foregoing) and substitutions of any of the patent applications in (a)-(c) above, all patents issuing thereon, and all
registrations, reissues, reexaminations or extensions of any kind with respect to any of the foregoing patents or their foreign counterparts.

In the event that Mayo jointly owns an invention with the Company or a third party who works with the Company in the Field by reason of
the fact that personnel of Mayo, Company and/or such third party are joint inventors of such invention, it is understood that the Patent Rights
include only Mayo's rights as a joint owner of the patent applications and patents that claim such joint invention.

1.20

"Permitted Third Party Funding Source" shall mean any non-profit or not-for-profit funding source that provides

funding to the laboratories of Drs. Jan Van Deursen, James Kirkland and/or Darren Baker.

1.21

"Proprietary Research Tool" shall mean a Research Tools(a) existing as of the Effective Date and listed on Exhibit C,

and (b) any future Research Tool used to discover or develop Patent Products and which Company elects to designate as a Proprietary
Research Tool pursuant to Section 2.4.

1.22

"Proprietary Research Tool Patents" shall mean the Patent Rights claiming the Proprietary Research Tools.  A list of
the Proprietary Research Tool Patents existing as of the Effective Date and organized by the Proprietary Research Tool which they cover, is
attached hereto as Exhibit C.  

1.23

"Research Tool" means animal models, cell lines, monoclonal antibodies, research assays and reagents, cloning tools,

and similar materials whose primary utility is in the conduct of basic scientific research.

1.24

"Research Tool Patent Claim" shall mean a claim of a Research Agreement Patent or Additional Invention Patent that

claims a Research Tool that has not been designated as Proprietary Research Tool by Company pursuant to Section 2.4.

1.25

"Sublicensee" shall mean any non-Affiliate third party to whom Company has granted the right to manufacture and

sell Licensed Products, with respect to Licensed Products made and sold by such third party.

1.26

"Valid Claim" shall mean a claim of (a) an issued and unexpired patent which has not been held unpatentable, invalid
or unenforceable by a court or other government agency of competent jurisdiction and has not been admitted to be invalid or unenforceable
through reissue, re-examination, disclaimer or otherwise; provided, however, that if the holding of such court or agency is later reversed by a
court or agency with overriding authority, the claim shall be reinstated as a Valid Claim with respect to Net Sales made after the date of such
reversal, and (b) a claim of a pending patent application which has not been abandoned or finally rejected without the possibility of appeal or
re-filing and has been pending for less than thirteen (13) years from the filing date from which such claim takes priority, provided that in the
event that a pending claim which has ceased to be a deemed a Valid Claim because it has been pending for more than

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

5

thirteen (13) years eventually issues, Company shall reimburse to Mayo for all back royalties (i.e., all royalties that would have been due
during the period commencing on the date such pending claim ceased to be considered a Valid Claim and the date on which it eventually
issued), plus interest on such back royalties at the rate described in Section 3.13.

ARTICLE 2

LICENSE

2.1

Grant.  Subject to the terms of the Agreement, Mayo hereby grants to Company a worldwide: (i) exclusive license to all

of Mayo’s interest in the Patent Rights (excluding the Research Tool Patent Claims) and the Proprietary Research Tools to develop, make,
use, sell, offer for sale, import, export or otherwise distribute Licensed Products, and (ii) nonexclusive license under the Research Tool
Patent Claims and Know-How to develop, make, use, sell, offer for sale, import, export or otherwise distribute Licensed Products, and to
have any of the foregoing performed on its behalf by a third party.  Notwithstanding any provisions in this Agreement, all rights granted in
and to Additional Inventions under this Agreement will be subject to any and all obligations that Mayo may have to Permitted Third Party
Funding Sources  

2.2

Option to Additional Inventions.  

to Company under Section 2.1 above, all worldwide patent rights owned or controlled by Mayo with respect to Additional Inventions.  

(a)

Subject to the terms of this Agreement, Company shall have an option to include within the license granted

(b)

Mayo shall notify Company promptly in writing of all Additional Inventions and shall provide Company

with a suitable description and other information reasonably requested by Company for the purpose of evaluating such Additional Inventions
for purposes of its option (such notice and accompanying information, an “Invention Disclosure”).

(c)

To exercise its option with respect to a particular Additional Invention, Company shall so notify Mayo within

ninety (90) days after receiving from Mayo a reasonably complete Invention Disclosure for such invention.  Following such exercise, all
patent applications and/or patents owned or controlled by Mayo directed to such invention shall be deemed included within the Patent
Rights.

2.3

 Sublicenses.  Company may grant and authorize sublicenses within the scope of the license granted to Company
pursuant to this Agreement.  Each such sublicense shall include provisions: (a) substantially identical to Sections 2.5, 2.6 and 13.11 and
Articles 10 and 11 with the Sublicensee in place of Company and (b) that are not inconsistent with any terms herein.

2.4

Designation of Additional Proprietary Research Tools.  

Companyshall have the right upon written notice to Mayo to designate any Additional Invention that is a
Research Tool or any Research Tool arising under the Research Agreement as a Proprietary Research Tool, in which case all patents and
patent applications owned or controlled by Mayo and directed to such Research Tool shall thereafter be deemed

(a)

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

6

Proprietary Research Tool Patents and such Research Tool, together with all patents and patent applications directed thereto, shall be
exclusively licensed to Company.

(b)

To exercise its option to designate a particular Research Tool as a Proprietary Research Tool, Company shall

provide Mayo with written notice of such election at the time it exercises its option under the Research Agreement or Section 2.2 above, as
applicable, to include such Research Tool within the licenses granted to Company under Section 2.1 above.  

2.5

Retained Rights.  Mayo hereby retains a non-exclusive, non-transferrable right under the Licensed Subject Matter for

its own clinical (including Mayo’s reference laboratory), educational and non-commercial research programs.

2.6

Governmental Rights.  All rights herein are subject to the rights and obligations to and requirements of the U.S.

government, if any have arisen or may arise, regarding the Patent Rights, including as set forth in 35 U.S.C. §§200 et al., 37 C.F.R. Part 401
et al. (“Bayh-Dole Act”). Company and Mayo each agree to comply with the provisions of the Bayh-Dole Act as relevant to the Patent
Rights, including in the case of Mayo, promptly reporting to the U.S. government all subject inventions and taking all actions necessary to
take title to the Patent Rights, and in the case of Company, promptly providing to Mayo with information reasonably requested by Mayo that
is necessary to enable Mayo to meet its compliance requirements under the Bayh-Dole Act.

2.7

No Implied Licenses.  Nothing herein shall be construed as granting Company, by implication, estoppel or otherwise,

any license or other right to any intellectual property of Mayo other than the Licensed Subject Matter or to grant to Company any right or
license other than those expressly granted herein.

PAYMENTS, FUNDING OBLIGATIONS AND REPORTS

ARTICLE 3

3.1

Equity.  In consideration for the rights and licenses granted by Mayo to Company herein and the research development
support agreed to by Mayo under Section 3.11, Company shall, within thirty (30) days of the Effective Date and subject to Mayo’s execution
and delivery to Company of a Stock Issuance Agreement in substantially the form attached hereto as Exhibit B, issue to Mayo Two Million
(2,000,000) shares of Company’s common stock.

3.2

Minimum Annual Royalty Payments.  As further consideration for the rights and licenses granted by Mayo to Company

herein Company shall pay to Mayo an annual minimum royalty of [***] U.S. Dollars ($[***]).  The first annual minimum royalty payment
shall be due within thirty (30) days of the fourth anniversary of the Effective Date with subsequent annual minimum royalty payments being
due within thirty (30) days of each subsequent anniversary of the Effective Date until the expiration (or if applicable, the earlier termination)
of this Agreement. Annual minimum royalty payments shall be non-refundable but shall be creditable against milestones owed under Section
3.3, running royalties accrued under Section 3.5 and/or sublicensing fees owed under Section 3.7, in each case during the one year period
following the date on which such annual minimum royalty payment was paid.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

7

3.3

Development Milestone Payments.  

Mayo following payments upon the occurrence of each milestone specified below:

(a)

In consideration for the rights and licenses granted by Mayo to Company herein, Company agrees to pay

Development Milestone Event

Development Milestone Payment  

1.Commencement of a Phase I Clinical Study for a Licensed Product  or a Buck Licensed

Product

2.Commencement of a Phase II Clinical Study for a Licensed Product or a Buck Licensed

Product

3. Commencement of a Phase III Clinical Study for a Licensed Product or a Buck Licensed

Product

4.Acceptance of filing of an MAA by the FDA, EMA or MHLW for a Licensed Product or a

Buck Licensed Product

$[***]

$[***]

$[***]

$[***]

(b)

Development milestones 1 to 3 shall be payable once each for the first two products (Licensed Products or
Buck Licensed Products) to achieve the applicable milestone event.  Milestone 4 shall be payable up to six times (i.e., once per MAA filed
and accepted for review by the Regulatory Authority), for  an aggregate of up to six (6) payments total.  For clarity, Company’s total
payment obligations under this Section 3.3 shall in no event exceed [***] U.S. Dollars ($[***]) (i.e. up to an aggregate total of $[***] under
milestones 1to 3 and up to an aggregate total of $[***] under milestone 4).

(c)

As used in this Section 3.3, the following terms shall have the following meanings:

(i)

(ii)

“EMA” means the European Medicines Agency or any successor agency thereto;

“FDA” means the United States Food and Drug Administration or any successor agency

thereto;

“Phase I Clinical Study” means any study in humans the principal purpose of which is
preliminary determination of safety in healthy individuals or patients as described under 21 C.F.R. §312.21(a) with respect to the United
States, or, with respect to a jurisdiction other than the United States, a similar clinical study, in each case which shall be deemed commenced
when the third participant in such study has received his or her initial dose of such Licensed Product or Buck Licensed Product;

(iii)

study of a License Product in the target patient population, as described under 21 C.F.R. §312.21(b) with respect to the United States, or,
with respect to a jurisdiction other than the United States, a similar clinical study, in each case which shall be deemed

(iv)

“Phase II Clinical Study” means a preliminary efficacy and dose ranging human clinical

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

8

commenced when the third patient in such study has received his or her initial dose of such Licensed Product or Buck Licensed Product;

(v)

“Phase III Clinical Study” means a human clinical study designed as a pivotal study to

confirm with statistical significance the efficacy and safety of a Licensed Product or Buck Licensed Product with respect to a given
indication, which study is performed for purposes of filing an MAA for such Product for such indication as described under 21 C.F.R.
§312.21(c) with respect to the United States, or, with respect to a jurisdiction other than the United States, a similar clinical study, in each
case which shall be deemed commenced when the third patient in such study has received his or her initial dose of such Licensed Product or
Buck Licensed Product; and

FDA as more fully defined in 21 C.F.R. §314.50 et. seq., or similar application or submission filed with or submitted to any Regulatory
Authority to obtain permission to initiate marketing and sales of a Licensed Product or Buck Licensed Product for a particular indication.  An
MAA shall be deemed to be “accepted” if it has been accepted for substantive review by the FDA or other applicable Regulatory Authority;

(vi)

“MAA” (Marketing Approval Application) shall mean a new drug application filed with the

“Korosho”) or any successor agency thereto.

(vii)

“MHLW” means Japan’s Ministry of Health, Labor and Welfare (also known as

regulatory agency, department, bureau or other governmental entity with authority over the discovery, development, commercialization or
other use or exploitation (including review and approval of MAAs) of pharmaceutical products in any jurisdiction, including the FDA, EMA,
and the MHLW.  

(viii)

“Regulatory Authority” means a federal, national, multinational, state, provincial or local

and the payment for such milestone shall be due within thirty (30) days of occurrence thereof.

(d)

Company agrees to promptly notify Mayo in writing of the occurrence of each of the foregoing milestones

3.4

Sales Milestones. In further consideration of the exclusive rights granted herein, Company shall pay Mayo the

following milestone payments upon achievement of the corresponding sales milestones:

exceeding [***] U.S. Dollars ($[***]), Company shall pay Mayo [***] U.S. Dollars ($[***]);

(a)

Upon first achieving aggregate Net Sales of a Licensed Product or Buck Licensed Product equal to or

exceeding [***] U.S. Dollars ($[***]), Company shall pay Mayo [***] U.S. Dollars ($[***]);

(b)

Upon first achieving aggregate Net Sales of a Licensed Product or Buck Licensed Product equal to or

exceeding [***] U.S. Dollars ($[***]), Company shall pay Mayo [***] U.S. Dollars ($[***]);

(c)

Upon first achieving aggregate Net Sales of a Licensed Product or Buck Licensed Product equal to or

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

9

exceeding [***] U.S. Dollars ($[***]), Company shall pay Mayo [***] U.S. Dollars ($[***]).

(d)

Upon first achieving aggregate Net Sales of a Licensed Product or Buck Licensed Product equal to or

The foregoing sales milestones shall be payable once for each of the first two products (Licensed Products or Buck Licensed
Products) to achieve the applicable sales thresholds.  For clarity, Company’s total payment obligations under this Section 3.4 shall in no
event exceed [***] U.S. Dollars ($[***]).  Company agrees to promptly notify Mayo in writing of the occurrence of each of the foregoing
milestones and the payment for such milestone shall be included with the royalty payment due for the calendar quarter in which such sales
milestone was achieved.  

3.5

Earned Royalty.  As additional consideration of the rights and licenses granted by Mayo to Company herein, except as
otherwise provided in this Article 3, Company agrees to pay to Mayo as running royalties a percentage of Net Sales from Licensed Products
and Buck Licensed Products sold by Company, its Affiliates and Sublicensees as follows:

Products;

(a)

(b)

[***]% of (i) annual Net Sales of Know-How Products and (ii) of annual net sales of Buck Know-How

For Patent Products and Buck Patent Products for which there are no Valid Claims within the Patent Rights

or Buck Patent Rights covering the composition of matter of the applicable Licensed Product or Buck Licensed Product:

Annual Net Sales of Licensed Product
Portion of worldwide annual Net Sales of such Patent Products and Buck Patent Products less than or equal to
[***] Dollars (US$[***])
Portion of worldwide annual Net Sales of such Patent Products and Buck Patent Products over [***] Dollars
(US$[***])

Applicable Royalty Rate
[***] %

[***]%

Rights covering the composition of matter of the applicable Patent Product or Buck Patent Product:

(c)

For Patent Products and Buck Patent Products for which there is at least one Valid Claim within the Patent

Annual Net Sales of Licensed Product
Portion of worldwide annual Net Sales of such Patent Products and Buck Patent Products less than or equal to
[***] Dollars (US$[***])
Portion of worldwide annual Net Sales of such Patent Products and Buck Patent Products over [***] Dollars
(US$[***])

Applicable Royalty Rate
[***]%

[***]%

Licensed Products or Buck Licensed Products transferred to Mayo or its Affiliates are not considered transfers for purposes of determining
Net Sales or for calculating Earned Royalty.  No Earned Royalty is due to Mayo on transfers to Mayo or its Affiliates.

3.6

Certain Additional Terms.

10

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
(a)

Royalty Term.  

product basis in a particular country upon the expiration of the last to expire Valid Claim in the Licensed Patents covering the composition of
matter of such Licensed Product in such country (or in the case of the Buck Licensed Patents, upon the expiration of the last to expire Valid
Claim  in the Buck Licensed Patents covering the composition of matter of such Buck Licensed Product in such country).

(i)

Mayo’s right to receive royalties under Section 3.5(c) above shall expire on a product-by-

(ii)

Mayo’s right to receive royalties under Section 3.5(b) above shall expire on a product-by-

product basis in a particular country upon the expiration of the last to expire Valid Claim in the Licensed Patents covering such Licensed
Product in such country (or in the case of the Buck Licensed Patents, upon the expiration of the last to expire Valid Claim  in the Buck
Licensed Patents covering such Buck Licensed Product in such country), provided that with respect to any Patent Product that is a Tool
Product (or any Buck Patent Product that is a Tool Patent), Mayo shall be entitled to continue to receive a royalty under Section 3.5(b) with
respect to worldwide sales of such Patent Product or Buck Patent Product until the expiration of the last to expire Valid Claim of the Tool
Patent(s) covering the Proprietary Research Tool(s) (or until the expiration of the last to expire Valid Claim of the Buck Tool Patent(s)
covering the Buck Proprietary Research Tool(s)), in each case whose use enabled the discovery or development of such Patent Product or
Buck Patent Product.

Mayo’s right to receive royalties under Section 3.5(a) above shall expire on earlier of (A)
the thirteenth (13th) anniversary of the first commercial sale of the first Licensed Product or Buck Licensed Product by Company anywhere
in the world, or (B) January 1, 2037.  

(iii)

(b)

Single Royalty; Non-Royalty Sales.  In the event that a Licensed Product or Buck Licensed Product would
be subject to two or more of the royalty provisions in Sections 3.5 above (e.g., in the event a Licensed Product or Buck Licensed Product is
covered by multiple Valid Claims, some of which are composition of matter claims and some of which are not), only a single royalty shall be
paid to Mayo with respect to such Licensed Product or Buck Licensed Product, that royalty being the highest of the royalties applicable to
such Licensed Product or Buck Licensed Product.  It is understood that royalties under Section 3.5(c) shall only be payable with respect to
Licensed Products or Buck Licensed Products whose sale would infringe a Valid Claim of the Licensed Patents or Buck Licensed Patents
covering the composition of matter of such Licensed Product or Buck Licensed Product in the country for which such Licensed Product or
Buck Licensed Product is sold.  In no event shall more than one royalty be due hereunder with respect to any Licensed Product (or Buck
Licensed Product) unit; nor shall a royalty be payable under this Article 3 with respect to sales of Licensed Products or Buck Licensed
Products at cost for use in research and/or development, in clinical trials or as samples.

(c)

Multiple Royalties.  If Company, its Affiliate or Sublicensee is required to pay a non-Affiliate third party

other than the Buck Institute for Research on Aging amounts with respect to a Licensed Product or Buck Licensed Product under agreements
for patent rights or other technologies which Company, its Affiliate or Sublicensee, in its best judgment, determines are necessary to license
or acquire with respect to such Licensed Product or Buck Licensed

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

11

Product, Company may deduct such amount owing to such non-Affiliate third parties (prior to any reductions) from the royalty owing to
Mayo for the sale of such Licensed Product or Buck Licensed Product pursuant to Section 3.5 above.  Notwithstanding the foregoing
provisions of this Section 3.6, in no event shall the royalties due to Mayo pursuant to Section 3.5 above be so reduced to an amount less than:

Licensed Products or Buck Licensed Product subject to Sections 3.5(a) or 3.5(b); or

(i)

[***] percent ([***]%) of the amount that would otherwise be due to Mayo with respect to

Licensed Products or Buck Licensed Product subject to Section 3.5(c).

(ii)

[***] percent ([***]%) of the amount that would otherwise be due to Mayo with respect to

(d)

Royalties on Buck Licensed Products.  Notwithstanding anything to the contrary in this Agreement it is

understood and agreed that any given Buck Licensed Product shall only be subject to milestone and royalty obligations under this Agreement
if that product is subject to milestone and royalty obligations under the Buck License Agreement.

3.7

Sublicense Fees.  

(a)

(b)

Company shall pay to Mayo [***]% of the Net Sublicensing Income received by Company or its Affiliates

Notwithstanding the foregoing:

Company shall only be obligated to share [***]% of that portion of the Net Sublicensing
Income that exceeds the then current aggregate amount spent by Company on the development of the Licensed Products included in such
sublicense as of the date such Net Sublicensing Income was received; and  

(i)

Dollars ($[***]).

(ii)

Company’s total payment obligations under this Section 3.7 shall be capped at [***] U.S.

3.8

Records & Accounting.   Company will throughout the Term, keep complete, true and accurate books of accounts and
records of Net Sales sufficient to support and verify the calculation of all royalties and sales milestones due and payable to Mayo under this
Agreement.  Such books and records will be open at reasonable times, but not more frequently than once per calendar year, for inspection by
a representative of Mayo, at Mayo's expense, for audit and verification of any report required under this Agreement with respect to Net Sales
received not more than ten (10) years prior to the date of Mayo's request.  Mayo representative will treat as confidential all relevant matters
and will be a person or firm reasonably acceptable to Company.  In the event such audit reveals an underpayment to Mayo, Company will
within thirty (30) days pay the royalty due in excess of the royalty actually paid.  In the event the audit reveals an underpayment by
Company of more than [***] percent ([***]%) of the amount due, Company will pay interest on the royalty due in excess of the royalty
actually paid in accordance with Section 3.13 below and will also pay all of Mayo’s costs in conducting the audit.  Notwithstanding the
foregoing, in the event that it is demonstrated that Company has knowingly underpaid royalties owed to Mayo (other than royalties being
withheld by Company in

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

12

connection with a dispute between the parties pre-dating the audit), Company will pay Mayo interest on the royalty due in excess of the
royalty actually paid at the maximum interest rate allowed by law in the State of New York.

3.9

Reports.  Beginning with the first accrual of Net Sales on which a royalty is due hereunder, Company shall provide to
Mayo a quarterly royalty report as follows:  Within ninety (90) days after the end of each calendar quarter, Company shall deliver to Mayo a
true and accurate report, giving such particulars of the business conducted by Company, its Affiliates and Sublicensees, if any, during such
calendar quarter as are pertinent to account for royalties due under this Article 3. Such report shall include at least (i) the total of Net Sales
during such quarter; (ii) the calculation of royalties; and (iii) the total royalties so calculated and due to Mayo.  Simultaneously with the
delivery of each such report, Company shall pay to Mayo the total royalties, if any, due to Mayo for the period of such report.  If no royalties
are due, Company shall so report.  Mayo shall not provide to non-Affiliate third parties any information contained in reports provided to
Mayo under this Section 3.09, or learned by Mayo under Section 3.08 above.

3.10

Payments.  All amounts payable hereunder by Company shall be payable in United States Dollars.  If any currency
conversion shall be required in connection with the payment of royalties hereunder, such conversion shall be made by using the exchange
rates used by Company in calculating Company's own revenues for financial reporting purposes.

3.11

Research & Development Funding by Mayo.

  Subject to the terms and conditions of this Agreement, Mayo

agrees to provide a total of up to [***] Dollars in two tranches of [***] Dollars ($[***]) each towards conducting research and development
beneficial to and approved by the Sponsor, which Sponsor has agreed to use to fund research at Mayo. Sponsor shall be permitted to satisfy
its payment obligation to Mayo through the use of a convertible promissory note (which note shall be convertible into Series A Preferred
Stock of the Sponsor).  Parties shall jointly develop the protocols of such research and development program.

3.12

Taxes.  Company is responsible for all taxes, duties, import duties, assessments and other governmental charges,

however designated, which are now or hereafter imposed by any authority on Company related to manufacture, use, sale or importation of
the Licensed Product.  Mayo shall be responsible for paying any and all taxes (other than withholding taxes or deduction of tax at source
required by applicable law to be paid by Company) levied on it by account of its receipt of any payments it receives under this
Agreement.  If applicable laws require that taxes be withheld or deducted at source from any amounts due to Mayo under this Agreement,
Company shall (a) deduct these taxes from the remittable amount, (b) pay the taxes to the proper taxing authority, and (c) deliver to Mayo a
statement including the amount of tax withheld and justification therefor, and such other information as may be necessary for tax credit
purposes. Company will obtain, or assist Mayo in obtaining, any tax reduction (including avoidance of double taxation), tax refund or tax
exemption available to Mayo by treaty or otherwise.

3.13

Overdue Payments.  If overdue, the payments due under this Agreement shall bear interest until paid at a per annum
rate of [***] percent ([***]%) above the prime rate in effect at US Bank on the due date.  The acceptance of any payment, including such
interest, shall not

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

13

foreclose Mayo from exercising any other right or seeking any other remedy that it may have as a consequence of the failure of Company to
make any payment when due.  

ARTICLE 4

DATA ACCESS

Promptly after the Effective Date, Mayo shall, upon Company’s request,  provide to Company all data, reports, analyses and other
information in its possession or control relating to the Licensed Products.  Thereafter, upon request by Company, Mayo shall provide copies
of all such additional materials as have been generated since the prior disclosure.  Subject to the provisions of Article 6 below, Company will
have the right to use all such data and materials for any purpose, and to provide the same to third parties under reasonable conditions of
confidentiality or as Company considers appropriate in connection with obtaining regulatory approval to market and/or commercializing
Licensed Products.  In addition, as reasonably requested by Company from time to time, Mayo shall at Company’s sole expense
(reimbursing Mayo’s costs to make  and deliver such Proprietary Research Tools), deliver to Company reasonable quantities of Proprietary
Research Tools based on availability.  The Parties agree that any and all materials supplied to Company by Mayo shall be supplied under a
material transfer agreement, the terms of which shall be substantially similar to the template material transfer agreement attached hereto as
Exhibit D.

ARTICLE 5
DUE DILIGENCE

5.1

Obligation to Exploit.  Company shall use commercially reasonable efforts to bring one or more Licensed Products to

market and to meet the market demand therefor.

5.2

Reports.  Within sixty (60) days following the end of each calendar year during the term of this Agreement, Company

shall prepare and deliver to Mayo a written report which shall describe, in reasonable detail, the research performed during the previous year
employing the Licensed Subject Matter, the progress of the development and exploitation of Licensed Subject Matter during the previous
year and the names of all Sublicensees (if any), including which of the Sublicensees are Affiliates Subject to the parameters outlined in
Section 3.8.

ARTICLE 6

CONFIDENTIALITY

6.1

Confidential Information.  Except as provided herein, each party shall maintain in confidence, and shall not use for any

purpose or disclose to any third party, non-public and proprietary information disclosed by the other party that (a) if in written, graphic,
machine readable or other tangible form is marked “Confidential,” “Proprietary” or in some other manner to indicate its confidential nature,
and if disclosed in oral or other intangible form is designated as confidential at the time of its initial disclosure and is confirmed in writing as
confidential within forty-five (45) days following such disclosure, or (b) that, given the nature of the information or the circumstances
surrounding its disclosure, reasonably should be considered as

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

14

confidential (collectively, "Confidential Information").  Confidential Information shall not include any information that is:  (i) already known
to the receiving party at the time of disclosure hereunder, or (ii) now or hereafter becomes publicly known other than through acts or
omissions of the receiving party, or (iii) is disclosed to the receiving party by a third party under no obligation of confidentiality to the
disclosing party or (iv) independently developed by the receiving party without reliance on the Confidential Information of the disclosing
party.

6.2

Permitted Usage.  Notwithstanding the provisions of Section 6.1 above, the receiving party may use or disclose

Confidential Information of the disclosing party to the extent necessary to exercise its rights hereunder (including commercialization and/or
sublicensing of Licensed Subject Matter) or fulfill its obligations and/or duties hereunder and in filing for, prosecuting or maintaining any
proprietary rights, prosecuting or defending litigation, complying with applicable governmental regulations and/or submitting information to
tax or other governmental authorities; provided that if the receiving party is required by law to make any public disclosures of Confidential
Information of the disclosing party, to the extent it may legally do so, it will give reasonable advance notice to the disclosing party of such
disclosure and will use its reasonable efforts to secure confidential treatment of Confidential Information prior to its disclosure (whether
through protective orders or otherwise). For clarity, to the extent it is reasonably necessary or appropriate to fulfill its obligations or exercise
its rights under this Agreement, a party may disclose Confidential Information of the other to Sublicensees, consultants, and outside
contractors on the condition that each such entity receiving such Confidential Information agrees to obligations of confidentiality and non-
use at least as stringent as those therein.

ARTICLE 7

PATENTS AND INVENTIONS

7.1

Prosecution of Patent Rights.  Company shall responsible for directing and controlling the filing, prosecution and

maintenance of all Patent Rights.  Company shall select the patent attorney, who is reasonably acceptable to Mayo.  Mayo shall have full
rights of consultation with the patent attorney so selected on all matters relating to Patent Rights.  For purposes of this Article 7, "prosecution
and maintenance" of patents and patent applications shall be deemed to include, without limitation, the conduct of interferences or
oppositions, and/or requests for re-examinations, reissues or extensions of patent terms.  

7.2

Patent Costs.  Company acknowledges and agrees that the license granted hereunder is in partial consideration for

Company's assumption of the costs of prosecution and maintenance of the Patent Rights as described herein. Company agrees to pay and
shall pay for all expenses incurred in connection with the prosecution and maintenance of the Patent Rights.  If Company fails to pay the
expenses incurred pursuant to Section 7.1 with respect to one or patents or patent applications, Mayo may, at its sole discretion, terminate
Company’s license with respect to such patent or patent applications, or with Company’s written consent,  convert it into a non-exclusive
license.  If at any time Company determines that it no longer desires to pay the patent costs with respect to one or more patents or patent
applications within the Patent Rights, Company shall give sixty (60) days advance written notice to Mayo.  Upon such notice, Company’s
license with respect to such patent or patent application shall terminate and

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

15

Company shall not be obligated to pay for any corresponding patent costs incurred after the end of such sixty (60) day period (but shall
remain responsible for all patent costs incurred prior to and during such sixty (60) day period).  

ARTICLE 8

TERM AND TERMINATION

8.1

Term.  Unless terminated earlier pursuant to this Article 8, the term of this Agreement shall commence on the Effective

Date and continue in full force and effect until the happening of the latter of: (1) the expiration, revocation or invalidation of the last issued
Valid Claim within the Patent Rights or the abandonment or rejection of the last pending Valid Claim within the Patent Rights, whichever is
later, or (2) the expiration of thirteen (13) years after first commercial sale of the first Licensed Product. Upon its natural expiration (and not
upon earlier termination), the rights under the Agreement shall convert into a fully paid-up License that grants Company the right to continue
selling Licensed Products.  

8.2

Termination for Breach.  

(a)

In the event of a material breach of this Agreement, the non-breaching party shall be entitled to terminate this

Agreement by written notice to the breaching party, if such breach is not cured within ninety (90) days after written notice is given by the
nonbreaching party to the breaching party specifying the breach.

(b)

Notwithstanding Section 8.2(a), in the event of a bonafide good faith dispute regarding whether in fact a

breach has occurred (other than a dispute regarding an alleged breach by Company of Article 11 (Use of Names), which for clarity shall not
be subject to the following), if the party alleged to be in breach of a material obligation or provision of this Agreement disputes such breach
within the applicable ninety (90) day period, the parties shall submit the dispute to a single arbitrator from the American Arbitration
Association (“AAA”) for a preliminary, non-binding determination, within sixty (60) days of the submission of the matter to arbitration, as to
whether it was more likely than not that a material obligation or provision of this Agreement was breached.    Such arbitration shall be
conducted in New York City in the State of New York pursuant to the commercial arbitration rules of the AAA, as modified by the
procedures set forth in this Section8.2(b).  The arbitrator shall be selected by mutual agreement of the parties; provided, however, that if the
parties cannot agree on an arbitrator within five days of a party’s request for a determination under this Section 8.2(b) as to whether a breach
of a material obligation or provision of this Agreement has occurred, the arbitrator shall be selected by the AAA.  If the arbitrator determines
that it is more likely than not that the asserted breach was a breach of a material obligation or provision of this Agreement and the breaching
party fails to cure such alleged breach within thirty (30) days after such determination, the non-breaching party may terminate this
Agreement forthwith by written notice to the other party.  If on the other hand, the arbitrator determines that it is more likely than not that the
asserted breach was not a breach of a material obligation or provision of this Agreement, the non-breaching party shall not have the right to
terminate this Agreement unless and until it has been finally determined by a court of competent jurisdiction that a material obligation or
provision of this Agreement has been breached and the breaching party fails to cure such breach within thirty (30) days after such

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

16

determination. It is understood that a determination by the arbitrator in accordance with this Article 8.2(a) will not be binding on the parties
as to whether the disputed activity was in fact a breach of a material obligation or provision of this Agreement and shall apply only to
determine whether or not the cure period should be tolled as provided in this Article 8.2(a).  In any case, a final determination of whether a
breach of a material obligation or provision of this Agreement has occurred shall be determined only by a court of competent jurisdiction.

8.3

Termination by Company.  Any provision herein notwithstanding, Company may terminate this Agreement, in its

entirety or as to any particular patent or patent application within the Patent Rights, or as to any particular Licensed Product, at any time by
giving Mayo at least sixty (60) days prior written notice.  From and after the effective date of a termination under this Section 8.3 with
respect to a particular patent or application, such patent(s) and patent application(s) in the particular country shall cease to be within the
Patent Rights for all purposes of this Agreement, and all rights and obligations of Company with respect to such patent(s) and patent
application(s) shall terminate.  From and after the effective date of a termination under this Section 8.3 with respect to a particular Licensed
Product, the license granted under Section 2.1 above shall terminate with respect to such Licensed Product, and the same shall cease to be a
Licensed Product for all purposes of this Agreement.  Upon a termination of this Agreement in its entirety under this Section 8.3, all rights
and obligations of the parties shall terminate, except as provided in Section 8.4 below.

8.4

Survival.

the time of such termination has already accrued to the other party.

(a)

Termination of this Agreement for any reason shall not release either party hereto from any liability which at

(b)

In the event this Agreement is terminated for any reason, Company shall provide Mayo with a written

inventory of all Licensed Products that Company and its Affiliates have in process of manufacture, in use or in stock and Company and its
Affiliates shall have the right to sell or otherwise dispose of such Licensed Products, all subject to the payment to Mayo royalties pursuant to
Article 3 hereof.

(c)

Upon termination of this Agreement by Mayo for any reason, any sublicense granted by Company hereunder

shall survive, provided that upon request by Mayo, such Sublicensee promptly agrees in writing to be bound by the applicable terms of this
Agreement.

(d)

Articles 6 (Confidentiality), 10 (Indemnification and Insurance), 11 (Use of Names), Section 8.4 (Survival),

12.3 (Disclaimers) and 13.11 (Limitation of Liability) shall survive the expiration and any termination of this Agreement.  Except as
otherwise provided in this Article 8, all rights and obligations of the parties under this Agreement shall terminate upon the expiration or
termination of this Agreement.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

ARTICLE 9
INFRINGEMENT
17

9.1

Enforcement.  If either party determines that a third party is making, using or selling a product that may infringe the

Patent Rights, that party shall notify the other party in writing.

(a)

Company shall have the first right (itself or through others), at its sole option, to bring suit to enforce the

Patent Rights, and/or to defend any declaratory judgment action with respect thereto, in each case with respect to the manufacture, sale or use
of a product within the Field; provided, however, that Company shall keep Mayo reasonably informed as to the defense and/or settlement of
such action.  Mayo shall have the right to participate in any such action with counsel of its own choice at its own expense. All recoveries
received by Company from an action to enforce the Patent Rights shall be first applied to reimburse Company's and then Mayo's
unreimbursed expenses, including without limitation, reasonable attorney's fees and court costs.  Any remainder shall, to the extent the same
pertains to an infringement of the Patent Rights, be divided [***] percent ([***]%) to Company and [***] percent ([***]%) to Mayo,
provided that Mayo's portion shall not exceed the amount Mayo would have received as a royalty hereunder if the infringing activities had
been made by Company.

(b)

In the event Company elects not to initiate an action to enforce the Patent Rights against infringement by a

third party within the Field, within one (1) year of a request by Mayo to do so, (or within such shorter period which may be required to
preserve the legal rights of Mayo under the laws of the relevant government), Mayo may initiate such action at its expense with Company’s
consent, which consent shall not be unreasonably withheld.  Company shall have the right to participate in any such action with counsel of its
own choice at its own expense.  All recoveries received by Mayo from an action to enforce the Patent Rights shall be first applied to
reimburse Mayo's and then Company's unreimbursed expenses, including without limitation, reasonable attorney's fees and court costs.  Any
remainder shall, to the extent the same pertains to an infringement of the Patent Rights in the Field, be divided [***] percent ([***]%) to
Company and [***] percent ([***]%) to Mayo.

9.2

Defense.  If Company, its Affiliate, Sublicensee, distributor or other customer is sued by a third party charging

infringement of patent rights that dominate a claim of the Patent Rights or that cover other Related Material with respect to the manufacture,
use, distribution or sale of a Licensed Product, Company will promptly notify Mayo. As between the parties to this Agreement, Company
will be entitled to control the defense in any such action(s) and withhold ten percent (10%) of the royalties related to such Licensed Product
otherwise payable to Mayo and use the withheld royalties to reimburse the legal defense costs, attorneys' fees and liability incurred in such
infringement suit(s).  Notwithstanding the foregoing, Company agrees to withhold only that portion of such royalties as may reasonably be
necessary to reimburse amounts in accordance with this Section 9.2.  For clarity, if Company is required to pay a royalty or other amounts to
a third party to make and/or sell a Licensed Product as a result of a final judgment or settlement; such amounts may be deducted from the
running royalties payable to Mayo hereunder in accordance with Section 3.6(c) above.

9.3

Cooperation.  In any suit, action or other proceeding in connection with enforcement and/or defense of the Patent

Rights, Mayo shall reasonably cooperate, including without limitation, by executing such documents as Company may reasonably
request.  Upon the request of and, at the sole expense of Company, Mayo shall make available at reasonable times

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

18

and under appropriate conditions all relevant personnel, records, papers, information, samples, specimens and other similar materials in
Mayo's possession. In the absence of an agreement to institute a suit jointly, Mayo shall not be required to join such action unless it has
agreed to do so in writing prior to the commencement thereof, or unless deemed by the court as a necessary party.  Company will bear the
entire cost of such litigation, including attorneys' fees.

9.4

No Implied Obligations.  Except as expressly provided in this Article 9, neither party has any obligation to bring or

prosecute actions or suits against any third party for patent infringement.

ARTICLE 10

INDEMNIFICATION & INSURANCE

10.1

Company shall hold harmless and indemnify Mayo, its trustees, directors, officers, employees, agents and the

successor and assigns of any of the foregoing (collectively, the "Indemnitees"), and hold each Indemnitee harmless from and against any and
all losses, costs, expenses, damages and liabilities resulting from claims, actions, demands, judgments, suits or proceedings brought by third
parties (including, without limitation, reasonable attorneys' fees and other expenses of litigation) (any of the foregoing, a "Claim"),
regardless of the legal theory asserted, against any Indemnitee, arising from or occurring as a result of: (a) the exercise or practice by
Company or its Affiliates or Sublicensees of the rights and licenses granted under this Agreement, and (b) the research, development, design,
manufacture, distribution, use, sale, importation, exportation or other disposition of Licensed Products by Company or its Affiliates or
Sublicensees; except and to the extent that such Claim(s) arise from or are related to a breach by Mayo of any of its representations or
warranties in Section 12.1.  Any Indemnitee that intends to claim indemnification under this Article 10 shall: (i) promptly notify Company in
writing of any Claim with respect to which the Indemnitee intends to claim such indemnification, (ii) give Company sole control of the
defense and/or settlement thereof, and (iii) provide Company, at Company's expense, with reasonable assistance and full information
reasonably available to Mayo with respect to such Claim.  Company shall not settle any claim, suit or proceeding subject to this Article 10 or
otherwise consent to an adverse judgment in such claim, suit or proceeding if the same materially diminishes the rights or interests of the
Indemnitee without the express written consent of the Indemnitee.  Notwithstanding the foregoing, Company shall have no obligations for
any Claim if the Indemnitee seeking indemnification makes any admission, settlement or other communication regarding such Claim (unless
made truthfully under a circumstance that legally requires such act by Mayo, in which case Mayo shall use its best efforts to inform
Company of such of its intent to make such admission prior to making it) without the prior written consent of Company, which consent shall
not be unreasonably withheld

10.2

Insurance.

general liability insurance with minimum coverage limits of at least [***] U.S. Dollars (US $[***]).

(a)

No later than sixty (60) days following the Effective Date, Company will obtain, keep in force and maintain

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

19

(b)

No later than sixty (60) days prior the initiation of the first human clinical testing of the first Licensed

Product, Company will obtain, keep in force and maintain occurrence-based liability insurance, including contractual liability, with minimum
coverage limits of at least [***] U.S. Dollars (US $[***]),

(c)

No later than sixty (60) days prior the first commercial sale of the first Licensed Product, Company will

obtain, keep in force and maintain occurrence-based liability insurance, including products liability and contractual liability, in an amount
and for a time period sufficient to cover the liability assumed by Company hereunder during the Term and after, such amount being at least
[***] U.S. Dollars (US $[***]) .  

any insurance coverage required herein shall not limit Company’s liability.  

(d)

Company’s policies will name Mayo and its Affiliates as additional-named insureds.  The minimum limits of

ARTICLE 11

USE OF NAMES

Except as required by law or in the normal course of business identification, neither Company nor Mayo shall issue any press

release or other written statements in connection with this Agreement intended for use in the public media in a manner suggesting any
endorsement by the other of Company or Mayo respectively, without the approval of such other party.  Company will not use for publicity,
promotion or other  purpose, any logo, name, trade name, service mark or trademark of Mayo or its Affiliates, including, but not limited to,
the terms “Mayo®,” “Mayo Clinic®” and the triple shield Mayo logo, or any simulation, abbreviation or adaptation of the same, or the name
of any Mayo employee or agent, without Mayo’s prior, written, express consent. With regard to the use of Mayo’s name, all requests for
approval pursuant to this Section must be submitted to the Mayo Clinic Public Affairs Business Relations Group, at the following e-mail
address: PublicAffairsBR@Mayo.edu at least ten (10) business days prior to the date on which a response is needed.

ARTICLE 12

REPRESENTATIONS AND WARRANTIES

12.1

Representations & Warranties by Mayo.  (a) Mayo has the sole right and authority to enter into this Agreement and

grant the rights and licenses hereunder; (b) Mayo has not previously granted any rights under the Licensed Subject Matter or Proprietary
Research Tools to any third party and will not grant any rights in the Proprietary Research Tools and Patent Rights (other than Research Tool
Patent Claims with respect to Research Tools that Company has declined to designate as Proprietary Research Tools) to any third party
during the term of this Agreement (it being understood that some Licensed Subject Matter and Proprietary Research Tools may be co-owned
by third parties and Mayo makes no representations as to how such third parties may have disposed of their rights in such co-
owned  Licensed Subject Matter and Proprietary Research Tools); (c) to the best of the  knowledge of Mayo Clinic Ventures (“MCV”),
which is the business unit of Mayo that is in-charge of intellectual property protection and commercialization, there are no claims of third
parties as of the Effective Date that would

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

20

call into question the rights of Mayo to grant to Company the rights contemplated hereunder; and (d) to the best of  MCV’s  knowledge,
except for the Patent Rights, as of the Effective Date, Mayo does not own or control any patent or patent application (including any invention
disclosure or draft patent application for which a patent application is intended to be filed) the claims of which would dominate any practice
of the Licensed Subject Matter.

12.2

(a)

Representations & Warranties by Company.

Company warrants and represents to Mayo that:

it has independently evaluated the Patent Rights, Know-How and Proprietary Research Tools and their applicability or

utility in Company’s activities, and Company is entering into this Agreement on the basis of its own evaluation of such applicability or utility
and not in reliance of any representation by Mayo with respect thereto, and assumes all risk and liability in connection with such
determination;

(b) 

(c) 

it will obtain and maintain insurance coverage as set forth in Section 10.2;

the execution and delivery of this Agreement has been duly authorized and no further approval, corporate or otherwise,

is required in order to execute this binding Agreement;

(d) 

it shall comply and require its Sublicensees to comply with all applicable international, national and state laws,

ordinances and regulations in its performance under this Agreement; and

(e) 

its rights and obligations under this Agreement do not conflict with any contractual obligation or court or

administrative order by which it is bound.  

12.3

Disclaimers.  

CONDITIONS (EXPRESS, IMPLIED, STATUTORY OR OTHERWISE) WITH RESPECT TO THE SUBJECT MATTER HEREOF.

(a)

EXCEPT AS PROVIDED IN THIS ARTICLE 12, NEITHER PARTY MAKES ANY WARRANTIES OR

(b)

EXCEPT AS EXPRESSLY PROVIDED IN THIS AGREEMENT, NEITHER PARTY MAKES ANY

PROMISES, COVENANTS, GUARANTEES, REPRESENTATIONS OR WARRANTIES OF ANY NATURE, DIRECTLY OR
INDIRECTLY, EXPRESS, STATUTORY OR IMPLIED, INCLUDING WITHOUT LIMITATION IN THE CASE OF MAYO,
MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, SUITABILITY, DURABILITY, CONDITION, QUALITY OR
ANY OTHER CHARACTERISTIC OF THE PATENT RIGHTS, KNOW-HOW OR CONFIDENTIAL INFORMATION.  SUBJECT TO
THE TERMS, REPRESENTATIONS AND WARRANTIES EXPRESSLY PROVIDED IN THIS AGREEMENT, PATENT RIGHTS,
KNOW-HOW AND CONFIDENTIAL INFORMATION ARE PROVIDED “AS IS.”  SUBJECT TO COMPANY’S RIGHTS AT LAW OR
IN EQUITY TO SEEK REDRESS FOR ANY BREACH BY MAYO OF THE REPRESENTATIONS AND WARRANTIES EXPRESSLY
PROVIDED BY MAYO IN THIS AGREEMENT, COMPANY EXPRESSLY WAIVES ALL RIGHTS TO MAKE ANY CLAIM
WHATSOEVER AGAINST MAYO FOR MISREPRESENTATION OR FOR BREACH OF GUARANTEE, REPRESENTATION OR
WARRANTY OF ANY KIND

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

21

RELATING TO THE PATENT RIGHTS, KNOW-HOW OR CONFIDENTIAL INFORMATION.  MAYO EXPRESSLY DISCLAIMS ANY
IMPLIED WARRANTIES ARISING FROM ANY COURSE OF DEALING, USAGE OR TRADE PRACTICE, WITH RESPECT TO:
THE SCOPE, VALIDITY OR ENFORCEABILITY OF THE PATENT RIGHTS, KNOW-HOW AND CONFIDENTIAL INFORMATION;
THAT ANY PATENT WILL ISSUE BASED UPON ANY PENDING PATENT APPLICATION; OR THAT THE USE, SALE, OFFER FOR
SALE OR IMPORTATION OF THE PATENT RIGHTS, KNOW-HOW OR MATERIALS WILL NOT INFRINGE OTHER
INTELLECTUAL PROPERTY RIGHTS. WITHOUT LIMITING MAYO’S OBLIGATIONS UNDER SECTION 9.3 ABOVE TO
COOPERATE WITH COMPANY WITH RESPECT TO ENFORCEMENT OF THE PATENT RIGHTS, NOTHING IN THIS
AGREEMENT WILL BE CONSTRUED AS AN OBLIGATION FOR MAYO TO BRING, PROSECUTE OR DEFEND ACTIONS
REGARDING THE PATENT RIGHTS, KNOW-HOW AND CONFIDENTIAL INFORMATION.

ARTICLE 13

GENERAL

13.1

Patent Marking.  Company agrees to mark, and require its Affiliates and Sublicensees to mark, all Licensed Products
sold with all applicable patent numbers or otherwise conform to patent laws and practices of the country in which such Licensed Product is
sold.

13.2

No Implied Obligations.  Company's sole obligation to exploit the Licensed Subject Matter is as set forth in

Articles 5.  Nothing in this Agreement shall be deemed to require Company to otherwise exploit the Licensed Subject Matter nor prevent
Company from commercializing products similar to or competitive with a Licensed Product.

13.3

Independent Contractors.  The relationship of Mayo and Company established by this Agreement is that of

independent contractors.  Nothing in this Agreement shall be construed to create any other relationship between Mayo and
Company.  Neither party shall have any right, power or authority to assume, create or incur any expense, liability or obligation, express or
implied, on behalf of the other.

13.4

Confidential Terms.  Except as expressly provided herein, each party agrees not to disclose any terms of this

Agreement to any third party without the consent of the other party, except as required by securities or other applicable laws, to prospective
and other investors and such party's accountants, attorneys and other professional advisors.

13.5

Assignment.  This Agreement may not be assigned by Company without the prior written consent of Mayo, except to
a party that succeeds to all or substantially all of Company's business or assets relating to this Agreement whether by sale, merger, operation
of law or otherwise; provided that such assignee or transferee promptly agrees in writing to be bound by the terms and conditions of this
Agreement.  Mayo may assign its right to receive payments hereunder upon prior written notice to Company.

13.6

Force Majeure.  In the event either party hereto is prevented from or delayed in the performance of any of its

obligations hereunder by reason of acts of God, war, strikes, riots,

22

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

storms, fires, or any other cause whatsoever beyond the reasonable control of the party, the party so prevented or delayed shall be excused
from the performance of any such obligation to the extent and during the period of such prevention or delay.

13.7

Notices.  Any notice or other communication required by this Agreement shall be made in writing and given by

prepaid, first class, certified mail, return receipt requested, and shall be deemed to have been served on the date received by the addressee at
the following address or such other address as may from time to time be designated to the other party in writing:

If to Mayo:              
Mayo Clinic Ventures – BB4
200 First Street SW

Rochester, MN 55905-0001

Mayo Foundation for Medical Education and Research

Attn:    [***]  
Phone: [***]
Facsimile: [***]

If to Company:

Attn: [***]
Phone: [***]
Email: [***]

with a copy to:

Email: [***]

Cenexys, Inc.

1700 Owens St., Suite 535,
San Francisco, CA 94158

Wilson Sonsini Goodrich & Rosati
650 Page Mill Road

Palo Alto, California 94304-1050
Attn:  [***]

13.8

Compliance with Law.  Company shall comply with all applicable federal, state and local laws and regulations in

connection with its activities pursuant to this Agreement.

13.9

Governing Law.  This Agreement shall be governed by, and construed and interpreted in accordance with, the laws of

the State of New York, without reference to its principles of conflicts of law.

13.10

No Waiver.  A waiver, express or implied, by either Mayo or Company of any right under this Agreement or of any
failure to perform or breach hereof by the other party hereto shall not constitute or be deemed to be a waiver of any other right hereunder or
of any other failure to perform or breach hereof by such other party, whether of a similar or dissimilar nature thereto.

13.11

Limitation of Liability.  NEITHER PARTY SHALL BE LIABLE TO THE OTHER PARTY OR ANY THIRD

PARTY FOR ANY SPECIAL, CONSEQUENTIAL, EXEMPLARY OR INCIDENTAL DAMAGES (INCLUDING LOST OR
ANTICIPATED

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

23

  
                  
 
REVENUES OR PROFITS RELATING TO THE SAME), ARISING FROM ANY CLAIM RELATING TO THIS AGREEMENT,
WHETHER SUCH CLAIM IS BASED ON CONTRACT, TORT (INCLUDING NEGLIGENCE) OR OTHERWISE, EVEN IF AN
AUTHORIZED REPRESENTATIVE OF SUCH PARTY IS ADVISED OF THE POSSIBILITY OR LIKELIHOOD OF SAME. IN NO
EVENT WILL MAYO’S LIABILITY OF ANY KIND INCLUDE ANY SPECIAL, INDIRECT, INCIDENTAL, CONSEQUENTIAL OR
PUNITIVE LOSSES OR DAMAGES, EVEN IF MAYO HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES, OR
EXCEED THE TOTAL COMPENSATION THAT HAS ACTUALLY BEEN PAID TO MAYO BY COMPANY AS OF THE DATE OF
FILING AN ACTION AGAINST MAYO THAT RESULTS IN THE SETTLEMENT OR AWARD OF DAMAGES TO COMPANY.

13.12

Headings.  Headings included herein are for convenience only, do not form a part of this Agreement and shall not be

used in any way to construe or interpret this Agreement.

13.13

Severability.  If any provision of this Agreement shall be found by a court to be void, invalid or unenforceable, the
same shall be reformed to comply with applicable law or stricken if not so conformable, so as not to affect the validity or enforceability of
the remainder of this Agreement.

13.14

Entire Agreement.  This Agreement constitutes the entire understanding and agreement between the parties with

respect to the subject matter hereof and supersedes any and all prior negotiations, representations, agreements, and understandings, written or
oral, that the parties may have reached with respect to the subject matter hereof.  No agreements altering or supplementing the terms hereof
may be made except by means of a written document signed by the duly authorized representatives of each of the parties hereto.  It is
understood that the Research Agreement is separate and independent from this Agreement and termination of either agreement shall not
operate to terminate or otherwise effect the rights and obligations of the parties under the other agreement.

13.15

Counterparts.  This Agreement may be executed in counterparts, each of which shall be deemed an original, but both

of which together shall constitute one and the same instrument, and photocopy, facsimile, electronic or other copies shall have the same
effect for all purposes as an inked original. Each party hereto consents to be bound by photocopy, electronic or facsimile signatures of each
party’s representative hereto.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

24

 
IN WITNESS WHEREOF, the parties hereto have caused their duly authorized representatives to execute this Agreement.

Mayo Foundation for Medical Education and Research
(“Mayo”)

By:/s/ Daniel D. Estes

Name: Daniel D. Estes

Title:  Assistant Treasurer

Cenexys, Inc. (“Company”)

By: /s/ Nathaniel David

Name:  Nathaniel David

Title:  CEO

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

25

 
 
 
 
 
[***]

EXHIBIT A
PATENT RIGHTS

Exhibit A-1
***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
EXHIBIT B
STOCK PURCHASE AGREEMENT

CENEXYS, INC.

STOCK PURCHASE AGREEMENT

This Stock Purchase Agreement (the “Agreement”) is made as of [__________, 2013] by and between Cenexys, Inc., a Delaware corporation

(the “Company”), and Mayo Foundation for Medical Education and Research (the “Purchaser”).

In consideration of the mutual covenants and representations set forth below, the Company and the Purchaser agree as follows:

1.

Purchase  and  Sale  of  the  Shares.  Subject  to  the  terms  and  conditions  of  this  Agreement,  the  Company  agrees  to  sell  to  the
Purchaser and the Purchaser agrees to purchase from the Company on the Closing (as defined below) 2,000,000 shares of the Company’s Common Stock,
par value $0.0001 per share (the “Shares”), at a price of $0.006 per share (the “Purchase Price”), for an aggregate purchase price of $12,000.00.

2.

Closing. The purchase and sale of the Shares shall occur at a closing (the “Closing”) to be held on the date first set forth above, or
at any other time mutually agreed upon by the Company and the Purchaser. The Closing will take place at the principal office of the Company or at such
other  place  as  shall  be  designated  by  the  Company.  At  the  Closing,  the  Purchaser  shall  deliver  the  aggregate  Purchase  Price  set  forth  above  to  the
Company by wire transfer, check or any other method of payment permissible under applicable law and approved by the Company’s board of directors (or
any combination of such methods of payment), and the Company will issue, as promptly thereafter as practicable, a stock certificate, registered in the
name of the Purchaser, reflecting the Shares.

3.

Limitation on Payments.

Payments Limitation. In the event that the severance and other benefits provided for in this Agreement or otherwise
payable to the Purchaser (i) constitute “parachute payments” within the meaning of Section 280G of the Code, and (ii) would be subject to the excise tax
imposed by Section 4999 of the Code (the “Excise Tax”), then the Purchaser’s benefits under this Agreement shall be either

A.

Excise Tax,

(1)

(2)

delivered in full, or

delivered  as  to  such  lesser  extent  which  would  result  in  no  portion  of  such  benefits  being  subject  to  the

whichever of the foregoing amounts, taking into account the applicable federal, state and local income taxes and the Excise Tax, results in the
receipt by the Purchaser on an after-tax basis, of the greatest amount of benefits, notwithstanding that all or some portion of such benefits may be taxable
under Section 4999 of the Code. Any reduction in payments and/or benefits required by this Section 3 will occur in the following order: (1) reduction of
cash payments; (2) reduction of vesting acceleration of equity awards; and (3) reduction of other benefits paid or provided to Purchaser. In the event that
acceleration of vesting of equity awards is to be reduced, such acceleration of vesting will be cancelled in the reverse order of the

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

Exhibit B-1

 
 
 
date of grant for Purchaser’s equity awards. If two or more equity awards are granted on the same date, each award will be reduced on a pro-rata basis. In
no event will Purchaser exercise any discretion with respect to the ordering of any reductions of payments or benefits under this Section 3.

B.

Determination. Unless the Company and the Purchaser otherwise agree in writing, any determination required under
this  Section  3  shall  be  made  in  writing  by  the  Company’s  independent  public  accountants  or  a  national  “Big  Four”  accounting  firm  selected  by  the
Company (the “Accountants”), whose determination shall be conclusive and binding upon the Purchaser and the Company for all purposes. For purposes
of making the calculations required by this Section 3, the Accountants may make reasonable assumptions and approximations concerning applicable taxes
and may rely on reasonable, good faith interpretations concerning the application of Section 280G and 4999 of the Code. The Company and the Purchaser
shall furnish to the Accountants such information and documents as the Accountants may reasonably request in order to make a determination under this
Section 3. The Company shall bear all costs the Accountants may reasonably incur in connection with any calculations contemplated by this Section 3.

4.

Restrictions on Transfer.

A.

Investment  Representations  and  Legend  Requirements. The  Purchaser  hereby  makes  the  investment  representations
listed  on  Exhibit  A  to  the  Company  as  of  the  date  of  this  Agreement  and  as  of  the  date  of  the  Closing,  and  agrees  that  such  representations  are
incorporated into this Agreement by this reference, such that the Company may rely on them in issuing the Shares. The Purchaser understands and agrees
that the Company shall cause the legends set forth below, or substantially equivalent legends, to be placed upon any certificate(s) evidencing ownership of
the Shares, together with any other legends that may be required by the Company or by applicable state or federal securities laws:

THE  SECURITIES  REPRESENTED  HEREBY  HAVE  NOT  BEEN  REGISTERED  UNDER  THE
SECURITIES  ACT  OF  1933  (THE  “ACT”)  AND  MAY  NOT  BE  OFFERED,  SOLD  OR  OTHERWISE
TRANSFERRED,  PLEDGED  OR  HYPOTHECATED  UNLESS  AND  UNTIL  REGISTERED  UNDER  THE
ACT OR, IN THE OPINION OF COUNSEL SATISFACTORY TO THE ISSUER OF THESE SECURITIES,
SUCH OFFER, SALE OR TRANSFER, PLEDGE OR HYPOTHECATION OTHERWISE COMPLIES WITH
THE ACT.

THE  SHARES  REPRESENTED  BY  THIS  CERTIFICATE  ARE  SUBJECT  TO  CERTAIN  RESTRICTIONS
ON  TRANSFER,  A  RIGHT  OF  FIRST  REFUSAL,  A  LOCK-UP  PERIOD  IN  THE  EVENT  OF  A  PUBLIC
OFFERING  AND  A  REPURCHASE  OPTION  HELD  BY  THE  ISSUER  OR  ITS  ASSIGNEE(S)  AS  SET
FORTH  IN  THE  STOCK  PURCHASE  AGREEMENT  BETWEEN  THE  ISSUER  AND  THE  ORIGINAL
HOLDER OF THESE SHARES, A COPY OF WHICH MAY BE OBTAINED AT THE PRINCIPAL OFFICE
OF THE ISSUER. SUCH TRANSFER RESTRICTIONS, RIGHT OF FIRST REFUSAL, LOCK-UP PERIOD
AND REPURCHASE OPTION ARE BINDING ON TRANSFEREES OF THESE SHARES.

Stop-Transfer  Notices.  The  Purchaser  agrees  that  to  ensure  compliance  with  the  restrictions  referred  to  herein,  the
Company may issue appropriate “stop transfer” instructions to its transfer agent, if any, and that, if the Company transfers its own securities, it may make
appropriate notations to the same effect in its own records.

B.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

Exhibit B-2

Refusal to Transfer. The Company shall not be required (i) to transfer on its books any Shares that have been sold or
otherwise transferred in violation of any of the provisions of this Agreement or (ii) to treat as owner of such Shares or to accord the right to vote or pay
dividends to any purchaser or other transferee to whom such Shares shall have been so transferred.

C.

D.

Lock-Up Period. The Purchaser hereby agrees that the Purchaser shall not sell, offer, pledge, contract to sell, grant any
option or contract to purchase, purchase any option or contract to sell, grant any right or warrant to purchase, lend or otherwise transfer or encumber,
directly  or  indirectly,  any  Shares  or  other  securities  of  the  Company,  nor  shall  the  Purchaser  enter  into  any  swap,  hedging  or  other  arrangement  that
transfers to another, in whole or in part, any of the economic consequences of ownership of any Shares or other securities of the Company, during the
period from the filing of the first registration statement of the Company filed under the Securities Act of 1933, as amended (the “Securities Act”),  that
includes securities to be sold on behalf of the Company to the public in an underwritten public offering under the Securities Act through the end of the
180-day period following the effective date of such registration statement (or such other period as may be requested by the Company or the underwriters
to  accommodate  regulatory  restrictions  on  (i)  the  publication  or  other  distribution  of  research  reports  and  (ii)  analyst  recommendations  and  opinions,
including, but not limited to, the restrictions contained in NASD Rule 2711(f)(4) or NYSE Rule 472(f)(4), or any successor provisions or amendments
thereto). The Purchaser further agrees, if so requested by the Company or any representative of its underwriters, to enter into such underwriter’s standard
form of “lockup” or “market standoff” agreement in a form satisfactory to the Company and such underwriter. The Company may impose stop-transfer
instructions with respect to securities subject to the foregoing restrictions until the end of any such restriction period.

Shares.  No  Shares  purchased  pursuant  to  this  Agreement,  nor  any  beneficial  interest  in  such  Shares,  shall  be  sold,
transferred, encumbered or otherwise disposed of in any way (whether by operation of law or otherwise) by the Purchaser or any subsequent transferee,
other than in compliance with the Company’s right of first refusal provisions contained in Section 5 of this Agreement.

E.

5.

Company’s Right of First Refusal.  Before  any  Shares  acquired  by  the  Purchaser  pursuant  to  this  Agreement  (or  any  beneficial
interest in such Shares) may be sold, transferred, encumbered or otherwise disposed of in any way (whether by operation of law or otherwise) by the
Purchaser  or  any  subsequent  transferee  (each  a  “Holder”),  such  Holder  must  first  offer  such  Shares  or  beneficial  interest  to  the  Company  and/or  its
assignee(s) as follows:

A.

Notice of Proposed Transfer. The Holder shall deliver to the Company a written notice stating: (i) the Holder’s bona
fide  intention  to  sell  or  otherwise  transfer  the  Shares;  (ii)  the  name  of  each  proposed  transferee;  (iii)  the  number  of  Shares  to  be  transferred  to  each
proposed transferee; (iv) the bona fide cash price or other consideration for which the Holder proposes to transfer the Shares; and (v) that by delivering
the notice, the Holder offers all such Shares to the Company and/or its assignee(s) pursuant to this section and on the same terms described in the notice.

Exercise of Right of First Refusal. At any time within 30 days after receipt of the Holder’s notice, the Company and/or
its assignee(s) may, by giving written notice to the Holder, elect to purchase all, but not less than all, of the Shares proposed to be transferred to any one or
more of the proposed transferees, at the purchase price determined in accordance with Section 5.C.

B.

Purchase Price. The purchase price for the Shares purchased by the Company and/or its assignee(s) under this section
shall be the price listed in the Holder’s notice. If the price listed in the Holder’s notice includes consideration other than cash, the cash equivalent value of
the non‑cash consideration shall be determined by the board of directors of the Company in its sole discretion.

C.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

Exhibit B-3

Payment. Payment of the purchase price shall be made, at the option of the Company and/or its assignee(s), in cash (by
check), by cancellation of all or a portion of any outstanding indebtedness of the Holder to the Company and/or its assignee(s), or by any combination
thereof within 30 days after receipt by the Company of the Holder’s notice (or at such later date as is called for by such notice).

D.

E.

Holder’s Right to Transfer. If all of the Shares proposed in the notice to be transferred to a given proposed transferee
are not purchased by the Company and/or its assignee(s) as provided in this section, then the Holder may sell or otherwise transfer such Shares to that
proposed transferee; provided that: (i) the transfer is made only on the terms provided for in the notice, with the exception of the purchase price, which
may be either the price listed in the notice or any higher price; (ii) such transfer is consummated within 60 days after the date the notice is delivered to the
Company; (iii) the transfer is effected in accordance with any applicable securities laws, and if requested by the Company, the Holder shall have delivered
an  opinion  of  counsel  acceptable  to  the  Company  to  that  effect;  and  (iv)  the  proposed  transferee  agrees  in  writing  to  receive  and  hold  the  Shares  so
transferred subject to all of the provisions of this Agreement, including but not limited to this section, and there shall be no further transfer of such Shares
except in accordance with the terms of this section. If any Shares described in a notice are not transferred to the proposed transferee within the period
provided above, then before any such Shares may be transferred, a new notice shall be given to the Company, and the Company and/or its assignees shall
again be offered the right of first refusal described in this section.

F.

Involuntary Transfers. Subject to the other provisions of this Section 5, in the event, at any time after the date of this
Agreement,  of  any  transfer  by  operation  of  law  or  other  involuntary  transfer  (including,  but  not  limited  to,  transfers  by  operation  of  law  or  other
involuntary transfers in connection with a divorce, dissolution, legal separation or annulment) of all or a portion of the Shares by the record holder thereof
that does not occur in accordance with the other provisions of this Section 5, the Company shall have the right to purchase all of the Shares transferred at
the greater of the purchase price paid by Purchaser pursuant to this Agreement or the fair market value of the Shares on the date of transfer (as determined
by the board of directors of the Company). Upon such a transfer, the persons transferring or acquiring the Shares shall promptly notify the Secretary of the
Company in writing of such transfer. The right to purchase such Shares shall be provided to the Company for a period of 30 days following receipt by the
Company of written notice of the transfer.

G.

Exception for Certain Family Transfers. Notwithstanding anything to the contrary contained elsewhere in this section,
the transfer of any or all of the Shares during the Holder’s lifetime (except in connection with a divorce, dissolution, legal separation or annulment) or on
the Holder’s death by will or intestacy to (i) the Holder’s spouse or domestic partner; (ii) the Holder’s lineal descendants or antecedents, siblings, aunts,
uncles,  nieces  and  nephews  (including  adoptive  relationships  and  step  relationships),  and  their  spouses  or  domestic  partners;  and  (iv)  a  trust  or  other
similar estate planning vehicle for the benefit of the Holder or any such person, shall be exempt from the provisions of this section; provided that, in each
such case, the transferee agrees in writing to receive and hold the Shares so transferred subject to all of the provisions of this Agreement, including but not
limited to this section, and there shall be no further transfer of such Shares except in accordance with the terms of this section; and provided further, that
without the prior written consent of the Company, which may be withheld in the sole discretion of the Company, no more than three transfers may be
made pursuant to this section, including all transfers by the Holder and all transfers by any transferee. For purposes of this Agreement, a person will be
deemed to be a “domestic partner” of another person if the two persons (1) reside in the same residence and plan to do so indefinitely, (2) have resided
together for at least one year, (3) are each at least 18 years of age and mentally competent to consent to contract, (4) are not blood relatives any closer than
would prohibit legal marriage in the state in which they reside, (5) are financially interdependent, as demonstrated to the reasonable satisfaction of the
Company and (6) have each been the sole spouse equivalent of the other for

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

Exhibit B-4

the year prior to the transfer and plan to remain so indefinitely; provided that a person will not be considered a domestic partner if he or she is married to
another person or has any other spouse equivalent.

H.

Termination of Right of First Refusal. The rights contained in this section shall terminate as to all Shares purchased
hereunder  upon  the  earlier  of:  (i)  the  closing  date  of  the  first  sale  of  Common  Stock  of  the  Company  to  the  general  public  pursuant  to  a  registration
statement filed with and declared effective by the Securities and Exchange Commission under the Securities Act, and (ii) the closing date of a Change of
Control pursuant to which the holders of the outstanding voting securities of the Company receive securities of a class registered pursuant to Section 12 of
the Securities Exchange Act of 1934, as amended.

6.

Tax  Consequences.  The  Purchaser  has  reviewed  with  the  Purchaser’s  own  tax  advisors  the  federal,  state,  local  and  foreign  tax
consequences of this investment and the transactions contemplated by this Agreement. The Purchaser is relying solely on such advisors and not on any
statements  or  representations  of  the  Company  or  any  of  its  agents.  The  Purchaser  understands  that  the  Purchaser  (and  not  the  Company)  shall  be
responsible for any tax liability that may arise as a result of the transactions contemplated by this Agreement.

7.

General Provisions.

California.

A.

Choice of Law. This Agreement shall be governed by the internal substantive laws, but not the choice of law rules, of

B.

Integration.  This  Agreement,  including  all  exhibits  hereto,  represents  the  entire  agreement  between  the  parties  with
respect  to  the  purchase  of  the  Shares  by  the  Purchaser  and  supersedes  and  replaces  any  and  all  prior  written  or  oral  agreements  regarding  the  subject
matter of this Agreement including, but not limited to, any representations made during any interviews, relocation discussions or negotiations whether
written or oral.

C.

Notices.  Any  notice,  demand,  offer,  request  or  other  communication  required  or  permitted  to  be  given  by  either  the
Company  or  the  Purchaser  pursuant  to  the  terms  of  this  Agreement  shall  be  in  writing  and  shall  be  deemed  effectively  given  the  earlier  of  (i)  when
received,  (ii)  when  delivered  personally,  (iii)  one  business  day  after  being  delivered  by  facsimile  (with  receipt  of  appropriate  confirmation),  (iv)  one
business  day  after  being  deposited  with  an  overnight  courier  service  or  (v)  four  days  after  being  deposited  in  the  U.S.  mail,  First  Class  with  postage
prepaid and return receipt requested, and addressed to the parties at the addresses provided to the Company (which the Company agrees to disclose to the
other parties upon request) or such other address as a party may request by notifying the other in writing.

D.

Successors. Any successor to the Company (whether direct or indirect and whether by purchase, merger, consolidation,
liquidation or otherwise) to all or substantially all of the Company’s business and/or assets shall assume the obligations under this Agreement and agree
expressly to perform the obligations under this Agreement in the same manner and to the same extent as the Company would be required to perform such
obligations in the absence of a succession. For all purposes under this Agreement, the term “Company” shall include any successor to the Company’s
business  and/or  assets  which  executes  and  delivers  the  assumption  agreement  described  in  this  section  or  which  becomes  bound  by  the  terms  of  this
Agreement by operation of law. Subject to the restrictions on transfer set forth in this Agreement, this Agreement shall be binding upon the Purchaser and
his or her heirs, executors, administrators, successors and assigns.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

Exhibit B-5

E.

Assignment;  Transfers.  Except  as  set  forth  in  this  Agreement,  this  Agreement,  and  any  and  all  rights,  duties  and
obligations hereunder, shall not be assigned, transferred, delegated or sublicensed by the Purchaser without the prior written consent of the Company. Any
attempt by the Purchaser without such consent to assign, transfer, delegate or sublicense any rights, duties or obligations that arise under this Agreement
shall be void. Except as set forth in this Agreement, any transfers in violation of any restriction upon transfer contained in any section of this Agreement
shall be void, unless such restriction is waived in accordance with the terms of this Agreement.

Waiver. Either party’s failure to enforce any provision of this Agreement shall not in any way be construed as a waiver
of any such provision, nor prevent that party from thereafter enforcing any other provision of this Agreement. The rights granted both parties hereunder
are cumulative and shall not constitute a waiver of either party’s right to assert any other legal remedy available to it.

F.

Purchaser Investment Representations and Further Documents.  The  Purchaser  agrees  upon  request  to  execute  any
further documents or instruments necessary or reasonably desirable in the view of the Company to carry out the purposes or intent of this Agreement,
including (but not limited to) the applicable exhibits and attachments to this Agreement.

G.

nevertheless remain effective and shall remain enforceable to the greatest extent permitted by law.

H.

Severability. Should any provision of this Agreement be found to be illegal or unenforceable, the other provisions shall

I.

Rights as Stockholder. Subject to the terms and conditions of this Agreement, the Purchaser shall have all of the rights
of a stockholder of the Company with respect to the Shares from and after the date that the Purchaser delivers a fully executed copy of this Agreement
(including  the  applicable  exhibits  and  attachments  to  this  Agreement)  and  full  payment  for  the  Shares  to  the  Company,  and  until  such  time  as  the
Purchaser disposes of the Shares in accordance with this Agreement. Upon such transfer, the Purchaser shall have no further rights as a holder of the
Shares so purchased except (in the case of a transfer to the Company) the right to receive payment for the Shares so purchased in accordance with the
provisions  of  this  Agreement,  and  the  Purchaser  shall  forthwith  cause  the  certificate(s)  evidencing  the  Shares  so  purchased  to  be  surrendered  to  the
Company for transfer or cancellation.

Agreement shall be adjusted to reflect any stock split, stock dividend or other change in the Shares which may be made after the date of this Agreement.

J.

Adjustment  for  Stock  Split.  All  references  to  the  number  of  Shares  and  the  purchase  price  of  the  Shares  in  this

K.

Employment at Will. THE PURCHASER ACKNOWLEDGES AND AGREES THAT THE VESTING OF SHARES
PURSUANT  TO  THIS  AGREEMENT  IS  EARNED  ONLY  BY  CONTINUING  SERVICE  AS  A  SERVICE  PROVIDER  AT  WILL  (AND  NOT
THROUGH THE ACT OF BEING HIRED OR PURCHASING SHARES HEREUNDER). THE PURCHASER FURTHER ACKNOWLEDGES AND
AGREES  THAT  THIS  AGREEMENT,  THE  TRANSACTIONS  CONTEMPLATED  HEREUNDER  AND  THE  VESTING  SCHEDULE  SET  FORTH
HEREIN  DO  NOT  CONSTITUTE  AN  EXPRESS  OR  IMPLIED  PROMISE  OF  CONTINUED  ENGAGEMENT  AS  A  SERVICE  PROVIDER  FOR
THE  VESTING  PERIOD,  OR  FOR  ANY  PERIOD  AT  ALL,  AND  SHALL  NOT  INTERFERE  WITH  THE  PURCHASER’S  RIGHT  OR  THE
COMPANY’S  RIGHT  TO  TERMINATE  THE  PURCHASER’S  RELATIONSHIP  WITH  THE  COMPANY  AT  ANY  TIME,  WITH  OR  WITHOUT
CAUSE OR NOTICE.    /s/ DE 7-3-13

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

Exhibit B-6

L.

Arbitration and Equitable Relief.

(1)

Arbitration. IN  CONSIDERATION  OF  THE  PROMISES  IN  THIS  AGREEMENT,  THE  PURCHASER
AGREES  THAT  ANY  AND  ALL  CONTROVERSIES,  CLAIMS,  OR  DISPUTES  WITH  ANYONE  (INCLUDING  THE  COMPANY  AND  ANY
EMPLOYEE,  OFFICER,  DIRECTOR,  SHAREHOLDER  OR  BENEFIT  PLAN  OF  THE  COMPANY  IN  THEIR  CAPACITY  AS  SUCH  OR
OTHERWISE)  ARISING  OUT  OF,  RELATING  TO,  OR  RESULTING  FROM  THIS  AGREEMENT,  SHALL  BE  SUBJECT  TO  BINDING
ARBITRATION UNDER THE ARBITRATION RULES SET FORTH IN CALIFORNIA CODE OF CIVIL PROCEDURE SECTION 1280 THROUGH
1294.2,  INCLUDING  SECTION  1283.05  (THE  “RULES”)  AND  PURSUANT  TO  CALIFORNIA  LAW.  DISPUTES  WHICH  THE  PURCHASER
AGREES TO ARBITRATE, AND THEREBY AGREES TO WAIVE ANY RIGHT TO A TRIAL BY JURY, INCLUDE ANY STATUTORY CLAIMS
UNDER STATE OR FEDERAL LAW, INCLUDING, BUT NOT LIMITED TO, CLAIMS UNDER TITLE VII OF THE CIVIL RIGHTS ACT OF 1964,
THE  AMERICANS  WITH  DISABILITIES  ACT  OF  1990,  THE  AGE  DISCRIMINATION  IN  EMPLOYMENT  ACT  OF  1967,  THE  OLDER
WORKERS BENEFIT PROTECTION ACT, THE WORKER ADJUSTMENT AND RETRAINING NOTIFICATION ACT, THE CALIFORNIA FAIR
EMPLOYMENT  AND  HOUSING  ACT,  THE  FAMILY  AND  MEDICAL  LEAVE  ACT,  THE  CALIFORNIA  FAMILY  RIGHTS  ACT,  THE
CALIFORNIA  LABOR  CODE,  CLAIMS  OF  HARASSMENT,  DISCRIMINATION  OR  WRONGFUL  TERMINATION  AND  ANY  STATUTORY
CLAIMS.  THE  PURCHASER  FURTHER  UNDERSTANDS  THAT  THIS  AGREEMENT  TO  ARBITRATE  ALSO  APPLIES  TO  ANY  DISPUTES
THAT THE COMPANY MAY HAVE WITH THE PURCHASER.

(2)

Procedure. THE PURCHASER AGREES THAT ANY ARBITRATION WILL BE ADMINISTERED BY
THE  AMERICAN  ARBITRATION  ASSOCIATION  (“AAA”) AND THAT THE NEUTRAL ARBITRATOR WILL BE SELECTED IN A MANNER
CONSISTENT WITH ITS NATIONAL RULES FOR THE RESOLUTION OF EMPLOYMENT DISPUTES. THE PURCHASER AGREES THAT THE
ARBITRATOR SHALL HAVE THE POWER TO DECIDE ANY MOTIONS BROUGHT BY ANY PARTY TO THE ARBITRATION, INCLUDING
MOTIONS  FOR  SUMMARY  JUDGMENT  AND/OR  ADJUDICATION  AND  MOTIONS  TO  DISMISS  AND  DEMURRERS,  PRIOR  TO  ANY
ARBITRATION  HEARING.  THE  PURCHASER  ALSO  AGREES  THAT  THE  ARBITRATOR  SHALL  HAVE  THE  POWER  TO  AWARD  ANY
REMEDIES, INCLUDING ATTORNEYS’ FEES AND COSTS, AVAILABLE UNDER APPLICABLE LAW. PURCHASER UNDERSTANDS THAT
THE COMPANY WILL PAY FOR ANY ADMINISTRATIVE OR HEARING FEES CHARGED BY THE ARBITRATOR OR AAA EXCEPT THAT
PURCHASER  SHALL  PAY  THE  FIRST  $125.00  OF  ANY  FILING  FEES  ASSOCIATED  WITH  ANY  ARBITRATION  PURCHASER  INITIATES.
PURCHASER AGREES THAT THE ARBITRATOR SHALL ADMINISTER AND CONDUCT ANY ARBITRATION IN A MANNER CONSISTENT
WITH  THE  RULES  AND  THAT  TO  THE  EXTENT  THAT  THE  AAA’S  NATIONAL  RULES  FOR  THE  RESOLUTION  OF  EMPLOYMENT
DISPUTES CONFLICT WITH THE RULES, THE RULES SHALL TAKE PRECEDENCE. THE PURCHASER AGREES THAT THE DECISION OF
THE ARBITRATOR SHALL BE IN WRITING.

(3)

Remedy.  EXCEPT  AS  PROVIDED  BY  THE  RULES  AND  THIS  AGREEMENT,  ARBITRATION
SHALL  BE  THE  SOLE,  EXCLUSIVE  AND  FINAL  REMEDY  FOR  ANY  DISPUTE  BETWEEN  THE  PURCHASER  AND  THE  COMPANY.
ACCORDINGLY, EXCEPT AS PROVIDED FOR BY THE RULES AND THIS AGREEMENT, NEITHER THE PURCHASER NOR THE COMPANY
WILL BE PERMITTED TO PURSUE COURT ACTION REGARDING CLAIMS THAT ARE SUBJECT TO ARBITRATION. NOTWITHSTANDING,
THE  ARBITRATOR  WILL  NOT  HAVE  THE  AUTHORITY  TO  DISREGARD  OR  REFUSE  TO  ENFORCE  ANY  LAWFUL  COMPANY  POLICY,
AND THE ARBITRATOR SHALL NOT ORDER OR REQUIRE THE COMPANY TO ADOPT A POLICY NOT OTHERWISE REQUIRED BY LAW
WHICH THE COMPANY HAS NOT ADOPTED.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

Exhibit B-7

(4)

Availability  of  Injunctive  Relief.  BOTH  PARTIES  AGREE  THAT  ANY  PARTY  MAY  PETITION  A
COURT  FOR  INJUNCTIVE  RELIEF  AS  PERMITTED  BY  THE  RULES  INCLUDING,  BUT  NOT  LIMITED  TO,  WHERE  EITHER  PARTY
ALLEGES OR CLAIMS A VIOLATION OF ANY CONFIDENTIAL INFORMATION OR INVENTION ASSIGNMENT AGREEMENT BETWEEN
THE PURCHASER AND THE COMPANY OR ANY OTHER AGREEMENT REGARDING TRADE SECRETS, CONFIDENTIAL INFORMATION,
NONSOLICITATION OR LABOR CODE §2870. BOTH PARTIES UNDERSTAND THAT ANY BREACH OR THREATENED BREACH OF SUCH
AN AGREEMENT WILL CAUSE IRREPARABLE INJURY AND THAT MONEY DAMAGES WILL NOT PROVIDE AN ADEQUATE REMEDY
THEREFOR  AND  BOTH  PARTIES  HEREBY  CONSENT  TO  THE  ISSUANCE  OF  AN  INJUNCTION.  IN  THE  EVENT  EITHER  PARTY  SEEKS
INJUNCTIVE RELIEF, THE PREVAILING PARTY SHALL BE ENTITLED TO RECOVER REASONABLE COSTS AND ATTORNEYS’ FEES.

Administrative  Relief.  THE  PURCHASER  UNDERSTANDS  THAT  THIS  AGREEMENT  DOES  NOT
PROHIBIT THE PURCHASER FROM PURSUING AN ADMINISTRATIVE CLAIM WITH A LOCAL, STATE OR FEDERAL ADMINISTRATIVE
BODY SUCH AS THE DEPARTMENT OF FAIR EMPLOYMENT AND HOUSING, THE EQUAL EMPLOYMENT OPPORTUNITY COMMISSION
OR THE WORKERS’ COMPENSATION BOARD. THIS AGREEMENT DOES, HOWEVER, PRECLUDE THE PURCHASER FROM PURSUING
COURT ACTION REGARDING ANY SUCH CLAIM.

(5)

(6)

Voluntary  Nature  of  Agreement.  THE  PURCHASER  ACKNOWLEDGES  AND  AGREES  THAT  THE
PURCHASER  IS  EXECUTING  THIS  AGREEMENT  VOLUNTARILY  AND  WITHOUT  ANY  DURESS  OR  UNDUE  INFLUENCE  BY  THE
COMPANY OR ANYONE ELSE. THE PURCHASER FURTHER ACKNOWLEDGES AND AGREES THAT THE PURCHASER HAS CAREFULLY
READ  THIS  AGREEMENT  AND  THAT  THE  PURCHASER  HAS  ASKED  ANY  QUESTIONS  NEEDED  FOR  THE  PURCHASER  TO
UNDERSTAND  THE  TERMS,  CONSEQUENCES  AND  BINDING  EFFECT  OF  THIS  AGREEMENT  AND  FULLY  UNDERSTANDS  IT,
INCLUDING THAT THE PURCHASER IS WAIVING THE PURCHASER’S RIGHT TO A JURY TRIAL. FINALLY, THE PURCHASER AGREES
THAT THE PURCHASER HAS BEEN PROVIDED AN OPPORTUNITY TO SEEK THE ADVICE OF AN ATTORNEY OF THE PURCHASER’S
CHOICE BEFORE SIGNING THIS AGREEMENT.

M.

Reliance on Counsel and Advisors. The Purchaser acknowledges that Wilson Sonsini Goodrich & Rosati, Professional
Corporation,  is  representing  only  the  Company  in  this  transaction.  The  Purchaser  acknowledges  that  he  or  she  has  had  the  opportunity  to  review  this
Agreement, including all attachments hereto, and the transactions contemplated by this Agreement with his or her own legal counsel, tax advisors and
other advisors. The Purchaser is relying solely on his or her own counsel and advisors and not on any statements or representations of the Company or its
agents for legal or other advice with respect to this investment or the transactions contemplated by this Agreement.

but all of which together will constitute one and the same agreement. Facsimile copies of signed signature pages shall be binding originals.

N.

Counterparts. This Agreement may be executed in one or more counterparts, each of which will be deemed an original,

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

(signature page follows)

Exhibit B-8

 
The  parties  represent  that  they  have  read  this  Agreement  in  its  entirety,  have  had  an  opportunity  to  obtain  the  advice  of  counsel  prior  to

executing this Agreement and fully understand this Agreement. The Purchaser agrees to notify the Company of any change in his or her address below.

MAYO FOUNDATION FOR MEDICAL EDUCATION AND
RESEARCH

CENEXYS, INC.

/s/ Daniel D. Estes
Signature

Daniel D. Estes
Print Name

Address:

200 First Street SW
Rochester, MN 55905

Signature

Print Name

Print Title

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

Exhibit B-9

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
i. EXHIBIT A

PURCHASER

:

Mayo Foundation for Medical Education and Research

INVESTMENT REPRESENTATION STATEMENT

COMPANY

SECURITY

AMOUNT

:

Cenexys, Inc.

:

2,000,000 shares

DATE

:

[__________, 2013]

:Common Stock

In connection with the purchase of the above-listed shares, I, the undersigned purchaser, represent to the Company as follows:

1.

The Company may rely on these representations. I understand that the Company’s sale of the shares to me has not been registered
under  the  Securities  Act  of  1933,  as  amended  (the  “Securities  Act”),  because  the  Company  believes,  relying  in  part  on  my  representations  in  this
document, that an exemption from such registration requirement is available for such sale. I understand that the availability of this exemption depends
upon the representations I am making to the Company in this document being true and correct.

2.

I am purchasing for investment. I am purchasing the shares solely for investment purposes, and not for further distribution. My
entire legal and beneficial ownership interest in the shares is being purchased and shall be held solely for my account, except to the extent I intend to hold
the shares jointly with my spouse. I am not a party to, and do not presently intend to enter into, any contract or other arrangement with any other person or
entity involving the resale, transfer, grant of participation with respect to or other distribution of any of the shares. My investment intent is not limited to
my present intention to hold the shares for the minimum capital gains period specified under any applicable tax law, for a deferred sale, for a specified
increase or decrease in the market price of the shares, or for any other fixed period in the future.

3.

I can protect my own interests. I can properly evaluate the merits and risks of an investment in the shares and can protect my own
interests in this regard, whether by reason of my own business and financial expertise, the business and financial expertise of certain professional advisors
unaffiliated with the Company with whom I have consulted, or my preexisting business or personal relationship with the Company or any of its officers,
directors or controlling persons.

4.

I am informed about the Company. I am sufficiently aware of the Company’s business affairs and financial condition to reach an
informed  and  knowledgeable  decision  to  acquire  the  shares.  I  have  had  opportunity  to  discuss  the  plans,  operations  and  financial  condition  of  the
Company with its officers, directors or controlling persons, and have received all information I deem appropriate for assessing the risk of an investment in
the shares.

5.

I recognize my economic risk. I realize that the purchase of the shares involves a high degree of risk, and that the Company’s future

prospects are uncertain. I am able to hold the shares indefinitely if required, and am able to bear the loss of my entire investment in the shares.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

Exhibit B-10

 
 
6.

I know that the shares are restricted securities. I understand that the shares are “restricted securities” in that the Company’s sale of
the shares to me has not been registered under the Securities Act in reliance upon an exemption for non-public offerings. In this regard, I also understand
and agree that:

or unless an exemption from registration is otherwise available (such as Rule 144);

A.

I must hold the shares indefinitely, unless any subsequent proposed resale by me is registered under the Securities Act,

B.

C.

the Company is under no obligation to register any subsequent proposed resale of the shares by me; and

the certificate evidencing the shares will be imprinted with a legend which prohibits the transfer of the shares unless

such transfer is registered or such registration is not required in the opinion of counsel for the Company.

7.

I am familiar with Rule 144. I am familiar with Rule 144 adopted under the Securities Act, which in some circumstances permits
limited public resales of “restricted securities” like the shares acquired from an issuer in a non-public offering. I understand that my ability to sell the
shares under Rule 144 in the future is uncertain, and may depend upon, among other things: (i) the availability of certain current public information about
the Company; (ii) the resale occurring more than a specified period after my purchase and full payment (within the meaning of Rule 144) for the shares;
and (iii) if I am an affiliate of the Company (A) the sale being made in an unsolicited “broker’s transaction”, transactions directly with a market maker or
riskless principal transactions, as those terms are defined under the Securities Exchange Act of 1934, as amended, (B) the amount of shares being sold
during any three-month period not exceeding the specified limitations stated in Rule 144, and (C) timely filing of a notice of proposed sale on Form 144,
if applicable.

8.

I know that Rule 144 may never be available. I understand that the requirements of Rule 144 may never be met, and that the shares
may never be saleable under the rule. I further understand that at the time I wish to sell the shares, there may be no public market for the Company’s stock
upon which to make such a sale, or the current public information requirements of Rule 144 may not be satisfied, either of which may preclude me from
selling the shares under Rule 144 even if the relevant holding period had been satisfied.

9.

I know that I am subject to further restrictions on resale. I understand that in the event Rule 144 is not available to me, any future
proposed sale of any of the shares by me will not be possible without prior registration under the Securities Act, compliance with some other registration
exemption (which may or may not be available), or each of the following: (i) my written notice to the Company containing detailed information regarding
the proposed sale, (ii) my providing an opinion of my counsel to the effect that such sale will not require registration, and (iii) the Company notifying me
in  writing  that  its  counsel  concurs  in  such  opinion.  I  understand  that  neither  the  Company  nor  its  counsel  is  obligated  to  provide  me  with  any  such
opinion. I understand that although Rule 144 is not exclusive, the Staff of the SEC has stated that persons proposing to sell private placement securities
other than in a registered offering or pursuant to Rule 144 will have a substantial burden of proof in establishing that an exemption from registration is
available for such offers or sales, and that such persons and their respective brokers who participate in such transactions do so at their own risk.

10.

I know that I may have tax liability due to the uncertain value of the shares. I understand that the board of directors believes its
valuation  of  the  shares  represents  a  fair  appraisal  of  their  worth,  but  that  it  remains  possible  that,  with  the  benefit  of  hindsight,  the  Internal  Revenue
Service may successfully assert that the value of the shares on the date of my purchase is substantially greater than the Board’s

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

Exhibit B-11

appraisal.  I  understand  that  any  additional  value  ascribed  to  the  shares  by  such  an  IRS  determination  will  constitute  ordinary  income  to  me  as  of  the
purchase date, and that any additional taxes and interest due as a result will be my sole responsibility payable only by me, and that the Company need not
and will not reimburse me for that tax liability.

11.

Residence. The address of my principal residence is set forth on the signature page below.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

(signature page follows)
Exhibit B-12

 
 
By signing below, I acknowledge my agreement with each of the statements contained in this Investment Representation Statement as of the

date first set forth above, and my intent for the Company to rely on such statements in issuing the shares to me.

MAYO FOUNDATION FOR MEDICAL EDUCATION AND
RESEARCH

/s/ Daniel D. Estes
Purchaser’s Signature

Daniel D. Estes
Print Name

Assistant Treasurer
Title

Address of Purchaser’s principal address:

200 First Street SW

Rochester, MN 55905

Exhibit B-13
[***] Certain information in this document has been omitted and filed separately with the Securities and Exchange Commission.  Confidential treatment has
been requested with respect to the omitted portions.

 
 
 
 
 
 
 
 
 
 
 
 
 
EXHIBIT C
PROPRIETARY RESEACH TOOLS

[***]
Exhibit C-1
***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
EXHIBIT D
MATERIAL TRANSFER AGREEMENT

MATERIAL TRANSFER AGREEMENT

Mayo Foundation for Medical Education and Research

Dr.                                                (Recipient Scientist)

DATE

COMPANY NAME

ADDRESS

ADDRESS

Mayo Foundation for Medical Education and Research (MAYO) is pleased to be able to provide

              INSERT MATERIALS HERE                                                                                     and any components thereof, which

we shall refer to throughout this agreement as the “Material,” to you at       COMPANY NAME         (Company). MAYO is interested in
supporting research using the Material and will provide you with samples of the Material as long as you agree to certain conditions on your
use of the Material.  The conditions described below are necessary to insure that the Material is used solely for research and that MAYO’s
interests in any possible commercialization of the Material are protected.  These conditions are:

1.

The Material is owned by MAYO and is provided under a license agreement effective as of ____ (“License”) between the
parties.  Upon termination of your research or use of the Material and/or at the instructions of MAYO, you shall either return the
Material to MAYO or destroy all unused portions of the Material.

2. Use of the Material must be restricted to research experimentation in compliance with applicable laws and regulations.  The Material
must not be used in human subjects, in clinical trials, for diagnostic purposes involving human subjects, or to make any derivatives or
progeny, as applicable, thereof without the written consent of MAYO.

3.

The Material must not be transferred to any other parties, other than researchers at your Company or collaborators that are working on
specific research projects on behalf of the Company (and transferred for the purpose of such collaboration) without first having
obtained a written agreement to the transfer from MAYO.  No researchers working with you

Exhibit D-1
***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
 
may use the Material unless they are aware of and agree to be bound by the terms of this agreement.  Both parties shall comply with all
applicable laws and regulations, as amended from time to time, with respect to the collection, use, storage and disclosure of the
Material and any related data, including without limitation, the Health Insurance Portability and Accountability Act of 1996 (HIPAA)
and its implementing regulations (45 C.F.R. et.seq.)

4.

Except to the extent prohibited by law, Company will assume all liability for damages which may arise from its use, storage or disposal
of the Material.  MAYO will not be liable to Company for any loss, claim or demand made by Company or made against Company by
any other party, due to or arising from the use of the Material by Company, except to the extent permitted by law when caused by the
gross negligence or willful misconduct of MAYO.

5. ANY MATERIAL DELIVERED PURSUANT TO THIS AGREEMENT IS UNDERSTOOD TO BE EXPERIMENTAL IN NATURE
AND MAY HAVE HAZARDOUS PROPERTIES.  ANY MATERIAL PROVIDED IS PROVIDED AS IS AND MAYO MAKES NO
AND HEREBY DISCLAIMS ALL REPRESENTATIONS OR WARRANTIES OF ANY KIND, EITHER EXPRESSED OR
IMPLIED.  THERE ARE NO EXPRESS OR IMPLIED WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE, OR THAT THE USE OF THE MATERIAL WILL NOT INFRINGE ANY PATENT, COPYRIGHT,
TRADEMARK OR OTHER PROPRIETARY RIGHTS.

6.

7.

8.

9.

Company agrees to provide appropriate acknowledgement of the source of the Material in all publications.

Company agrees to pay $             in partial reimbursement of the costs of producing, maintaining and distributing the Material.

Company will not use publicly for publicity, promotion, or otherwise, any logo, name, trade name, service mark, or trademark of
MAYO or its Affiliates, including, but not limited to the terms “Mayo®,” “Mayo Clinic®,” and the triple shield Mayo logo, or any
simulation, abbreviation, or adaptation of the same, or the name of any MAYO employee or agent, without MAYO’s prior, written,
express consent, other than provided in Section 6 above.  MAYO may withhold such consent in MAYO’s absolute discretion.

This agreement, in conjunction with the license agreement, constitutes the final, complete and exclusive agreement between the parties
with respect to its subject matter and supercedes all past and contemporaneous agreements, promises, and understandings, whether oral
or written, between the parties.  This agreement shall be binding upon and inure to the benefit of the parties, their heirs, legal
representatives, successors and assigns.  This agreement may not be amended or modified except by a writing signed by both parties
and identified as an amendment to this agreement. Neither this agreement nor any of the rights or obligations under the agreement may
be assigned by Company without the written consent of MAYO. The failure of MAYO to insist at any time upon the strict observance
or performance of any of the provisions of this agreement, or to exercise any right or remedy

Exhibit D-2
***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
as provided in this agreement, will not impair any such right or remedy and will not be construed to be a waiver or relinquishment of
the right or remedy.  Execution of this agreement can be effected by photocopied, scanned or faxed signatures.

If you agree to these conditions, please sign in the space provided below as the Recipient and have an authorized representative of

your Company sign where indicated.  Return the agreement to Mayo Foundation for Medical Education and Research, Mayo Clinic
Ventures, 200 First Street SW, Rochester, MN  55905.  Upon receipt of the signed agreement, MAYO will provide the Material as requested.

Exhibit D-3
***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

[SIGNATURES ON THE NEXT PAGE]

 
MAYO FOUNDATION FOR MEDICAL EDUCATION AND RESEARCH

By:

Date:

Daniel D. Estes, Assistant Treasurer

READ AND UNDERSTOOD BY THE RECIPIENT SCIENTIST:

(Recipient Scientist Signature)*

(Recipient Scientist)

ACCEPTED AND AGREED BY AUTHORIZED REPRESENTATIVE OF RECEIVING COMPANY

By:

Date:

(Authorized Representative’s Signature)*

Printed Name and Title:  

Company:

Address:

Phone No.:

*Please Note: The Recipient and the Authorized Representative cannot be the same.

Exhibit D-4
***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
 
 
 
Exhibit 10.19B

AMENDMENT NO. 1 TO EXCLUSIVE LICENSE AGREEMENT

THIS  Amendment  No.1 to Exclusive  License  Agreement  ("Amendment")  is made and entered

h
into  this  10th   day  of  September  2014  ("Effective  Date"),  by  and  between  the  Mayo  Foundation for

Medical  Education  and  Research  ("Mayo")  having  its  principal  place  of  business  at  200  First  Street  SW,  Rochester,  MN  55905,  and  Cenexys,  Inc.,  a
Delaware corporation, having a place of business at 1700 Owen Street, Suite 535 San Francisco, CA 94158 ("Company"), for purposes of confirming the
parties' intent and agreement as set forth herein.

May and Company are parties to an Exclusive License Agreement,  with an effective    date of the

h
28th day  of June,  2013 ("Agreement"), which  confirms  the parties'  intent  and  agreement  to  grant   an

BACKGROUND

exclusive license to Mayo's certain patent rights and a nonexclusive license to certain know-how. Mayo and Company wish to amend the Agreement as set
forth in this Amendment No. 1, and, accordingly, Mayo and Company agree as follows:

Exhibit A in its entirety will be deleted and replaced with the exhibit attached to this Amendment No. 1.

All other  terms  of  the  Agreement  shall  remain  in  full  force  and  effect  for  the  term  of the

Agreement and as set forth in the Agreement.

AMENDED TERMS

IN WITNESS WHEREOF, Mayo and Company hereby enter into this Amendment No. 1, effective as of the date first set forth above.

Cenexys, Inc.

By:/s/ Nathaniel E. David
Nathaniel E. David, Ph.D.
CEO

Mayo Foundation for Medical Education and Research

By: /s/ James A. Rogers, III
James A. Rogers, III
Assistant Secretary

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
 
 
 
 
 
 
 
EXHIBIT A

PATENT RIGHTS

[***]

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

Exhibit 10.19D

AMENDMENT NO. 3 TO EXCLUSIVE LICENSE AGREEMENT

THIS Amendment No. 3  to Exclusive  License  Agreement  ("Amendment  3")  is made  and entered  into this 5th day  of  May,  2015  ("Effective  Date  of
Amendment 3"), by and between the Mayo Foundation for Medical Education and Research ("Mayo") having its principal place of business at 200 First Street SW,
Rochester, Minnesota 55905, and Unity Biotechnology, Inc. (formerly known as Cenexys, Inc.), a Delaware corporation, having a place of business at 1700 Owen
Street, Suite 535 San Francisco, California 94158 ("Company"), for purposes of confirming the parties' intent and agreement as set forth herein.

BACKGROUND

Mayo and Company are parties to an Exclusive License Agreement, with an effective date of the 28th day of June, 2013 ("Agreement"), which confirms
the parties' intent and agreement to grant an exclusive license to Mayo's certain patent rights and a nonexclusive license to certain know-how along with Amendment
No. I and Amendment No. 2 to the Agreement.  Mayo and Company wish to amend the Agreement as set forth in this Amendment No. 3, and, accordingly, Mayo and
Company agree as follows:

Exhibit A in its entirety will be deleted and replaced with the exhibit attached to this Amendment No. 3.

AMENDED TERMS

All  other  terms  of  the  Agreement  and  Amendment  No.  2  shall  remain  in  full  force  and  effect  for  the  term  of  the  Agreement  and  as  set  forth  in  the

Agreement.

IN WITNESS WHEREOF, Mayo and Company hereby enter into this Amendment No. 3, effective as of the date first set forth above.

Unity Biotechnology, Inc.

By:/s/ Nathaniel E. David
Name: Nathaniel E. David, PhD
Title: President

Mayo Foundation for Medical Education and Research

By: /s/ Daniel D. Estes
Name: Daniel D. Estes
Title: Assistant Treasurer

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
EXHIBIT A
PATENT RIGHTS

[***]

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
AMENDMENT NO. 4 TO EXCLUSIVE LICENSE AGREEMENT

THIS  Amendment  No.  4  to  Exclusive  License  Agreement  ("Amendment  No.  4")  is  made  and  entered  into  this  15th  day  of  September  2016
("Effective 
the  Mayo  Foundation  for  Medical  Education  and  Research  ("Mayo")  having
  Date  of  Amendment  No.  4"),  by  and 
its  principal  place  of  business at 200 First Street SW, Rochester, Minnesota 55905, and Unity Biotechnology, Inc. (formerly known as Cenexys, Inc.), a Delaware
corporation, having a place of business at 3280 Bayshore  Blvd,  Brisbane  ("Company"),  for  purposes  of  confirming  the  parties'  intent  and  agreement  as  set  forth
herein.

  between 

Exhibit 10.19E

Mayo and Company  are parties to an Exclusive License Agreement, with an effective date of the

h

BACKGROUND

28th day of  June,  2013  ("Agreement"),  which  confirms  the  parties'  intent  and  agreement  to grant an exclusive license to Mayo's certain
patent rights and a nonexclusive license to certain know-how along  with Amendment No. 1, Amendment No. 2, and Amendment No. 3 to
the  Agreement.  Mayo  and Company agree that there is no need to amend Exhibit C listing the proprietary research tools. Mayo and
Company wish to amend the Agreement as set forth  in  this Amendment  No. 4, and, accordingly, Mayo and Company agree as  follows:

AMENDED TERMS

1.    Exhibit A in its entirety will be deleted and replaced with the exhibit attached to this Amendment   No. 4.

All other terms of the Agreement and Amendment No. 3 shall remain in full force and effect for  the term of the Agreement and as set forth in the

Agreement.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
 
 
 
 
IN WITNESS WHEREOF, Mayo and Company hereby enter into this Amendment No. 4, effective as of the date first set forth above.

Unity Biotechnology, Inc.

By:/s/ Nathaniel E. David

Mayo Foundation for Medical Education and
Research

By: /s/ Daniel D. Estes
Name: Daniel D. Estes
Title: Assistant Treasurer

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

2

 
 
 
 
 
 
EXHIBIT A

PATENT RIGHTS

[***]

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

3

 
Unity Biotechnology
3280 Bayshore Blvd., Suite 100
Brisbane, CA 94005

September 15, 2016

Exhibit 10.19F

Mayo Foundation for Medical Education and Research 200 First Street SW
Rochester, MN 55905 Attn:  Daniel D.
Estes

re:

Addendum to Amendment 4 to Exclusive License Agreement

Dear Daniel:

As you know, Mayo Foundation for Medical Education and Research ("Mayo") and Unity Biotechnology, Inc. ("Unity") are parties to an
Exclusive License Agreement ("Agreement"), effective as of June 28, 2013. Pursuant to Section 2.2 of the Agreement, Mayo granted to
Unity an option to include within the licenses granted under the Agreement any "Additional Developments" (as defined in the
Agreement) developed during the IP Capture Period (as defined in the Agreement). In connection with the grant of such option, Mayo
further agreed to promptly notify Unity in writing of all Additional Inventions developed by Mayo personnel during the IP Capture
Period and to provide Unity with a suitable description of such Additional Invention together with such other information as Unity may
reasonably request for purposes of enabling Unity to assess its interest in such Additional Developments.

As requested by Mayo, Unity is providing this letter to confirm that it has received timely notice of the Additional Inventions listed in
Appendix A hereto (each such additional Invention identified by Mayo's designated case number) and to provide a summary of which
Additional Inventions it has elected to license, which it has declined to license and which Additional Inventions are still under
consideration. Appendix A indicates with respect to each Additional Invention whether 1) Unity will be declining a license 2) Unity is
exercising its option to a license, or 3) Unity would like to learn more about the Additional Invention from the Mayo innovators before
deciding whether to exercise its option. Additionally, as requested by Mayo, Appendix A, also lists those patent applications that have been
filed as of the current date for those Additional Inventions exercised under the option.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
 
If Mayo is in agreement with the summary provided in Appendix A, we ask that you please so indicate by signing below and kindly returning a copy of
this letter to me. A duplicate original is enclosed for your records. If you have any questions or comments, please do not hesitate to contact me at [***] or
by e-mail at [***].  Thank you.

Sincerely,

/s/ Nathaniel E. David

Nathaniel E. David, Ph.D.
CEO
Unity Biotechnology, Inc.

Agreed and accepted:

Mayo Foundation for Medical Education and Research

/s/ Daniel D. Estes

Name: Daniel D. Estes
Title: Assistant Treasurer
Date: 9-23-2016

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

2

 
 
 
 
 
 
 
[***]

APPENDIX A

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
Exhibit 10.19G

AMENDMENT NO. 5 TO EXCLUSIVE LICENSE AGREEMENT

THIS  Amendment  No.5  to  Exclusive  License  Agreement  (“Amendment  5”)  is  made  and  entered  into  this  12th  day  of  October,  2016
(“Effective Date of Amendment 5”), by and between the Mayo Foundation for Medical Education and Research (“Mayo”) having its principal place of
business  at  200  First  Street  SW,  Rochester,  MN  55905,  and  Unity  Biotechnology,  Inc.,  a  Delaware  corporation,  having  a  place  of  business  at  3280
Bayshore Blvd, Brisbane CA 94005  (“Company”), for purposes of confirming the parties’ intent and agreement as set forth herein.  

BACKGROUND

WHEREAS, Mayo and Cenexys, Inc. are parties to that certain Exclusive License Agreement, with an effective date of the 28th day of June,

2013 (“Agreement”), along with the first, second, third and fourth Amendments to the Agreement.

WHEREAS, Company is the successor in interest to Cenexys, Inc.

WHEREAS, Mayo and Company have entered into a new exclusive license agreement of even date herewith (the “New License Agreement”),
and in connection with the entry into such New License Agreement, Mayo and Company wish to amend the Agreement as set forth in this Amendment
No. 5, and, accordingly, Mayo and Company agree as follows:

1.

The following new definition is added as Section 1.29:

AMENDED TERMS

"New License Agreement" shall mean that certain Exclusive License Agreement entered into by Mayo and Company as of October 12th, 2016.

2.

3.

The following new sentence is added to the end of Section 3.2: “Notwithstanding the foregoing, annual minimum royalty payments made
under the New License Agreement shall be fully creditable against annual minimum royalty payments due under this Section 3.2 and vice
versa.”

The following new Subsection (c) is added after Subsection 3.3(b) and the prior Subsection 3.3(c) is hereinafter re-labeled as new Subsection
3.3(d) and the prior Subsection 3.3(d) is hereinafter re-labeled as new Subsection new Subsection 3.3(e):

(c) Notwithstanding anything to the contrary in this Section 3.3, in the event that the achievement of a development milestone event set forth in Section
3.3(a) would trigger a development milestone payment under both this Section 3.3 and Section 3.3 of the New License Agreement, then Company shall
only be obligated to pay a single development milestone payment with respect to the achievement of such development milestone event, which payment
shall be the higher of the applicable development milestone payment in this Agreement and the applicable development milestone payment in the New
License

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
 
 
Agreement  for  such  development  milestone  event.    For  purposes  of  clarity,  it  is  understood  that  payment  of  a  development  milestone  payment  with
respect to such development milestone event under the New License Agreement shall satisfy in full Licensee’s payment obligations under this Section 3.3
with  respect  to  such  development  milestone  event  so  long  as  such  development  milestone  payment  actually  paid  to  Mayo  exceeds  (or  equals)  the
development milestone payment that would have been due to Mayo under this Agreement.  Notwithstanding the foregoing, at such time as development
milestones 1, 2 and 3 in Section 3.3 of the New License Agreement have been paid with respect to two products (as defined in Section 3.3 of the New
License Agreement), then no further payments will be owed with respect to Licensed Products achieving development milestones 1, 2 and 3 under this
Section 3.3.  Similarly, at such time as milestone 4 of the New License Agreement has been paid six times, then no further payment will be owed with
respect to Licensed Products achieving development milestone 4 under this Section 3.3.

4.

The last paragraph of Section 3.4 which reads:

The foregoing sales milestones shall be payable once for each of the first two products (Licensed Products or Buck Licensed Products) to achieve
the applicable sales thresholds.  For clarity, Company’s total payment obligations under this Section 3.4 shall in no event exceed [***] U.S. Dollars
($[***]).    Company  agrees  to  promptly  notify  Mayo  in  writing  of  the  occurrence  of  each  of  the  foregoing  milestones  and  the  payment  for  such
milestone shall be included with the royalty payment due for the calendar quarter in which such sales milestone was achieved.

is hereby relabeled as Subsection 3.4(e) and amended to read as follows:

(e) Certain Additional Terms.

(i)

(ii)

The  foregoing  sales  milestones  shall  be  payable  once  for  each  of  the  first  two  products  (Licensed  Products  or  Buck  Licensed
Products) to achieve the applicable sales thresholds.  For clarity, Company’s total payment obligations under this Section 3.4 shall
in no event exceed [***] U.S. Dollars ($[***]).  Company agrees to promptly notify Mayo in writing of the occurrence of each of
the  foregoing  milestones  and  the  payment  for  such  milestone  shall  be  included  with  the  royalty  payment  due  for  the  calendar
quarter in which such sales milestone was achieved.

Notwithstanding anything to the contrary in this Section 3.4, in the event that the achievement of a sales milestone event set forth
in  this  Section  3.4  would  trigger  a  sales  milestone  payment  under  both  this  Section  3.4  and  Section  3.4  of  the  New  License
Agreement, then Company shall only be obligated to pay a single sales milestone payment with respect to the achievement of such
sales  milestone  event,  which  payment  shall  be  the  higher  of  the  applicable  sales  milestone  payment  in  this  Agreement  and  the
applicable sales milestone payment in the New License Agreement for such sales milestone event.  For purposes of clarity, it is
understood  that  payment  of  a  sales  milestone  payment  with  respect  to  such  sales  milestone  event  under  the  New  License
Agreement shall satisfy in full Licensee’s payment obligations under this Section 3.4 with respect to such sales milestone event so
long as such sales milestone payment actually paid to Mayo exceeds (or equals)

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

2

 
 
 
 
 
 
the sales milestone payment that would have been due to Mayo under this Agreement.  Notwithstanding the foregoing, at such
time  the  sales  milestones  described  in  Section  3.4  of  the  New  License  Agreement  have  been  paid  with  respect  to  the  first  two
products  (as  defined  in  Section  3.4  of  the  New  License  Agreement)  achieving  the  applicable  sales  thresholds,  then  no  further
payments will be owed under Section 3.4 of this Agreement with respect to subsequent Licensed Products achieving the applicable
sales thresholds.”

5.

Section 3.6(b) which reads:

(b)  Single Royalty; Non-Royalty Sales.  In the event that a Licensed Product or Buck Licensed Product would be subject to two or more of
the royalty provisions in Sections 3.5 above (e.g., in the event a Licensed Product or Buck Licensed Product is covered by multiple Valid
Claims, some of which are composition of matter claims and some of which are not), only a single royalty shall be paid to Mayo with respect
to  such  Licensed  Product  or  Buck  Licensed  Product,  that  royalty  being  the  highest  of  the  royalties  applicable  to  such  Licensed  Product  or
Buck Licensed Product.  It is understood that royalties under Section 3.5(c) shall only be payable with respect to Licensed Products or Buck
Licensed Products whose sale would infringe a Valid Claim of the Licensed Patents or Buck Licensed Patents covering the composition of
matter  of  such  Licensed  Product  or  Buck  Licensed  Product  in  the  country  for  which  such  Licensed  Product  or  Buck  Licensed  Product  is
sold.  In no event shall more than one royalty be due hereunder with respect to any Licensed Product (or Buck Licensed Product) unit; nor
shall a royalty be payable under this Article 3 with respect to sales of Licensed Products or Buck Licensed Products at cost for use in research
and/or development, in clinical trials or as samples.

is hereby amended to read as follows;

(b)  Single Royalty; Non-Royalty Sales.  

(i)

(ii)

In  the  event  that  a  Licensed  Product  or  Buck  Licensed  Product  would  be  subject  to  two  or  more  of  the  royalty
provisions  in  Sections  3.5  above  (e.g.,  in  the  event  a  Licensed  Product  or  Buck  Licensed  Product  is  covered  by
multiple  Valid  Claims,  some  of  which  are  composition  of  matter  claims  and  some  of  which  are  not),  only  a  single
royalty shall be paid to Mayo with respect to such Licensed Product or Buck Licensed Product, that royalty being the
highest of the royalties applicable to such Licensed Product or Buck Licensed Product.  

In the event that the sale of a particular Licensed Product that is subject to a running royalty obligation under Section
3.5 above is also subject to a running royalty under Section 3.5 of the New License Agreement, Company shall only
be obligated to pay a single royalty with respect to the sale of such Licensed Product, which royalty shall be the higher
of  the  applicable  royalty  in  this  Agreement  and  the  applicable  royalty  in  the  New  License  Agreement  for  such
particular Licensed Product.  For purposes of clarity, it is understood that payment of a royalty with respect to the sale
of a particular Licensed Product under the New License

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

3

 
 
 
 
 
 
 
 
 
 
Agreement shall satisfy in full Licensee’s royalty obligations under Section 3.5 with respect to such Licensed Product
so long as such royalty actually paid to Mayo exceeds (or equals) the royalty that would have been due to Mayo under
this Agreement.

(iii)

It is understood that royalties under Section 3.5(c) shall only be payable with respect to Licensed Products or Buck
Licensed  Products  whose  sale  would  infringe  a  Valid  Claim  of  the  Licensed  Patents  or  Buck  Licensed  Patents
covering the composition of matter of such Licensed Product or Buck Licensed Product in the country for which such
Licensed Product or Buck Licensed Product is sold.  In no event shall more than one royalty be due hereunder with
respect to any Licensed Product (or Buck Licensed Product) unit; nor shall a royalty be payable under this Article 3
with respect to sales of Licensed Products or Buck Licensed Products at cost for use in research and/or development,
in clinical trials or as samples.

6.

The  following  new  Subsection  (ii)  is  added  after  Subsection  3.7(b)(i)  and  the  prior  Subsection  3.7(b)(ii)  is  hereinafter  re-labeled  as  new
Subsection 3.6(b)(iii):

(ii)
in the event (A) Company grants a sublicense under the rights licensed to it pursuant to this Agreement as well as under the rights
licensed  to  it  pursuant  to  the  New  License  Agreement,  and  (B)  Net  Sublicensing  Income  received  under  this  Agreement  is  subject  to  a
payment obligation under this Section 3.7 as well as Section 3.7 of the New License Agreement, Company shall only be subject to a single
payment obligation with respect to such Net Sublicensing Income, which payment obligation shall be the higher of the payment obligation
applicable to such Sublicense Revenue under this Section 3.7 and under Section 3.7 of New License Agreement.  For purposes of clarity, it is
understood  that  any  amounts  paid  by  Company  to  Mayo  with  respect  to  any  given  Net  Sublicensing  Income  under  the  New  License
Agreement shall satisfy in full Company’s payment obligations under this Section 3.7 with respect to such Net Sublicensing Income so long
as the amount actually paid to Mayo exceeds (or equals) the amount that would have been due to Mayo under this Section 3.7; and

All other terms of the Agreement and the first Amendment shall remain in full force and effect for the term of the Agreement and as set forth

in the Agreement.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

4

 
 
 
 
 
 
IN WITNESS WHEREOF, Mayo and Company hereby enter into this Amendment [No. 3], effective as of the date first set forth above.

Unity Biotechnology, Inc.

By:/s/ Nathaniel David
Printed Name: Nathaniel David

Mayo Foundation for Medical Education and
Research

By: /s/ Daniel D. Estes
Printed Name: Daniel D. Estes

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

5

 
 
 
Exhibit 10.20

AMENDED AND RESTATED EXCLUSIVE LICENSE AGREEMENT

This Amended and Restated License Agreement (“Agreement”) is made as of the 27th day of January, 2017 (the “Signature

Date”) by and between the Buck Institute for Research on Aging, a California non-profit public benefit corporation having its principal place
of business at 8001 Redwood Boulevard, Novato, California 94945 (“Buck”), and Unity Biotechnology, Inc., a Delaware corporation, having
a place of business at 3280 Brisbane Blvd, Brisbane, California 94005 (“Sponsor”).

BACKGROUND

A.

Sponsor’s predecessor, Cenexys, Inc. (“Cenexys”) and Buck previously entered into that certain License Agreement

dated February 3, 2014 (the “Prior License Agreement”) pursuant to which Buck granted to Cenexys an exclusive license to certain “Patent
Rights” and “Know-How” (all as defined in the Prior License Agreement).

B.

Buck and Cenexys have also previously entered into a Sponsored Research Agreement, effective as of August 21, 2014,

pursuant to which Sponsor funded certain research conducted in the laboratory of Dr. Judith Campisi (“Campisi”) at Buck (the “Campisi
Research Agreement”) in exchange for an option to include within the Prior License Agreement inventions arising from such funded
research.

C.

Cenexys entered into a similar licensing and funded research arrangement with the Mayo Foundation for Medical

Education and Research (“Mayo”), executing an Exclusive License Agreement with Mayo effective June 28, 2013, and a sponsored research
agreement with Mayo effective September 25, 2014 (the “Mayo Research Agreement”);

D.

Sponsor now desires to fund research in the laboratory of Buck faculty member Dr. Simon Melov (“Melov”) and in

furtherance of this objective Sponsor and Buck have entered into a Sponsored Research Agreement of even date herewith (the “Melov
Research Agreement”);

E.

In connection with their entry into the Melov Research Agreement, Sponsor and Buck desire to amend and restate the

Prior License Agreement to provide for the inclusion within the licenses granted thereunder rights to inventions with respect to which
Sponsor has exercised its option under Section 7.6.1 of the Melov Research Agreement;

F.

The research conducted by Mayo under the Mayo Research Agreement and by Buck under the Campisi Research

Agreement and Melov Research Agreement (collectively, “Buck Research Agreements”) is collaborative, such that information and results
generated by each of Mayo and Buck may be shared with each of Buck and Mayo, and Mayo may be provided with access to the Know-
How; and

G.

Because of the collaborative nature of the research, Sponsor has agreed that Buck will share in revenues resulting from

Know-How Products and Patent Products (each as defined below), including Know-How Products and Patent Products that have been
identified or developed by Mayo instead of by Buck.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
NOW, THEREFORE, in consideration of the mutual covenants and promises herein contained, the parties hereto agree as follows:

ARTICLE 1

DEFINITIONS

As used in this Agreement, the following capitalized terms shall have the meanings indicated:

1.1

“Additional Inventions” shall mean discoveries and inventions that (i) are developed in the laboratory of Dr. Judith

Campisi at Buck during the IP Capture Period, and (ii) are necessary or reasonably useful for the development, manufacture or
commercialization of Licensed Products within the Field, excluding inventions generated pursuant to the Campisi Research Agreement and
subject to the terms thereof.

1.2

“Affiliate” shall mean any entity which controls, is controlled by or is under common control with Sponsor. An entity

shall be regarded as in control of another entity for purposes of this definition if it owns or controls more than fifty percent (50%) of the
shares of the subject entity entitled to vote in the election of directors (or, in the case of an entity that is not a corporation, for the election of
the corresponding managing authority).

1.3

“Commercially Reasonable Efforts” means those efforts and diligence (including with respect to the allocation of

resources and personnel) consistent with the reasonable efforts and diligence that would be typically exerted by a biotechnology or
pharmaceutical company in a similar circumstance in pursuing the research, development, and commercialization of products of similar
nature and comparable market potential.

1.4

1.5

1.6

1.7

“Effective Date” shall mean February 3, 2014.

“EMA” shall mean the European Medicines Agency or any successor agency thereto.

“FDA” shall mean the United States Food and Drug Administration or any successor agency thereto.

“Field” shall mean (a) the prophylaxis, treatment, modulation or palliation of diseases or conditions through (i) the

clearance or killing of senescent cells, or (ii) the inhibition or modulation of the deleterious effects of senescent cells, and (b) the prediction,
diagnosis, monitoring and tracking of diseases or conditions being prevented, treated, modulated or inhibited pursuant to subsection (a)
above.

1.8

“First Commercial Sale” means, with respect to a Licensed Product, the first sale of such product by Sponsor, its
Affiliates or its Sublicensees to a third party following approval of an MAA by the applicable Regulatory Authority in the country or
territory of sale.

1.9

“GAAP” shall mean the conventions, rules and procedures that define accounting practices as established, and revised

or amended, by the Financial Accounting Standards Board and the U.S. Securities Exchange Commission.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

2

1.10

1.11

“IP Capture Period” shall mean the period commencing on [***] and continuing until [***].

“Know-How” shall mean all technical information, know-how, processes, procedures, compositions, methods,

techniques, or data that has been generated (a) by Buck personnel in the Campisi laboratory prior to the Effective Date (“Existing Know-
How”), (b) by Buck personnel in the Campisi laboratory and/or the Melov laboratory during and in the course of performing research
activities under the Buck Research Agreements (“Research Agreement Know‑How”) or (c) otherwise by Buck personnel in the Campisi
laboratory during the IP Capture Period (“Additional Know-How”), in each case that are necessary for the development or
commercialization of Licensed Products. For the avoidance of doubt, Know-How does not include any information, know-how, processes,
procedures, methods, techniques, or data that has been or is generated by any personnel of Buck outside of the Campisi and Melov
laboratories at Buck.

1.12

“Know-How Product” shall mean any Licensed Product that (a) incorporates Know-How or whose discovery or use

was enabled by Sponsor’s use of Know-How, or (b) meets the definition of “Know-How Product” under the Mayo License as the same exists
as of the Effective Date, and in each case is not a Patent Product.

1.13

1.14

1.15

“Licensed Product” shall mean a product, composition or material for use in the Field.

“Licensed Subject Matter” shall mean the Patent Rights and the Know-How.

“Mayo Patent Rights” shall mean all patent applications and patents including, without limitation, all divisions,

continuations, continuations-in-part, patents of addition, and substitutions, registrations, reissues, reexaminations or extensions of any kind
with respect to any of the foregoing patent applications and patents, that are licensed to Sponsor or Sponsor’s Affiliates by Mayo under the
Mayo License Agreement.

1.16

“MAA” (Marketing Approval Application) shall mean a new drug application filed with the FDA as more fully

defined in 21 C.F.R. §314.50 et. seq., or similar application or submission filed with or submitted to any Regulatory Authority to obtain
permission to initiate marketing and sales of a Know-How Product or Patent Product for a particular indication. An MAA shall be deemed to
be “accepted” if it has been accepted for substantive review by the FDA or other applicable Regulatory Authority.

1.17

“MHLW” means Japan’s Ministry of Health, Labor and Welfare (also known as “Korosho”) or any successor agency

thereto.

1.18

“Net Sales” shall mean the total amount invoiced to third parties (or, in the absence of an invoice, received by

Sponsor) on sales of Royalty Products by Sponsor, its Affiliates, or Sublicensees, for which royalties are due under Article 3 below, less the
following reasonable and customary deductions actually given: (i) all trade, cash and quantity credits, discounts, refunds or government
rebates; (ii) amounts for claims, allowances or credits for returns, retroactive price reductions, or chargebacks; (iii) packaging, handling fees
and prepaid freight, sales taxes, duties and other governmental charges (including value added tax), shown on

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

3

the face of the invoice; and (iv) provisions for uncollectible accounts determined in accordance with GAAP, consistently applied to all
products of the selling party, provided that in no event shall deductions for uncollectible accounts in any annual period exceed [***] percent
([***]%) of the cumulative Net Sales in such annual period. In the event that Sponsor and a third party enter into a barter transaction
pursuant to which Sponsor transfers Royalty Products to such third party in exchange for non-cash consideration provided in lieu of cash,
then Net Sales shall be calculated based on the fair market value of the non-cash consideration received, provided that in no event shall the
transferred Royalty Products be valued at more than the then‑current customary sales price for such Royalty Products invoiced to third
parties or fair market value if there are no current invoices to third parties. For the removal of doubt, Net Sales shall not include sales by
Sponsor to its Affiliates for resale, provided that if Sponsor transfers a Royalty Product to an Affiliate, and the Affiliate retransfers such
Royalty Product to a third‑party purchaser, then Net Sales shall be the price charged by the Affiliate to the third-party purchaser, less
documented allowable deductions.

1.19

“Net Sublicensing Income” shall mean gross cash revenues (or the fair market value of any other consideration

received in lieu of a cash payment, including, without limitation, securities, materials and equipment) received by Sponsor or its Affiliates
from a Sublicensee in consideration of the grant to such Sublicensee of a sublicense under any of the Licensed Subject Matter, but excluding
earned royalties and any other share of net sales (including revenue sharing and profit payments). Net Sublicensing Income shall include
without limitation any license signing fee, license maintenance fee, minimum royalty payments (but only to the extent not credited against
royalties due on Sublicensee’s sales of Royalty Products) or milestone payment, and any consideration received for an investment in equity
(and conditional equity, such as warrants, convertible debt) of Sponsor to the extent such consideration exceeds the fair market value of such
equity or other conditional equity. Not included in the definition of Net Sublicensing Income is income received by Sponsor or its Affiliates:
(a) as bona fide loans; (b) from equity investments (and conditional equity, such as warrants, convertible debt) in Sponsor at market value;
(c) as reimbursements for actual documented patent prosecution costs and patent maintenance expenses; (d) as payment or reimbursement
for research and development and/or other services conducted by or for Sponsor, including costs of materials, equipment, manufacturing
services or clinical testing, e.g., provided on the basis of full‑time equivalent (“FTE”) efforts of personnel at or below commercially
reasonable and standard FTE rates (“FTE Reimbursements”) and/or the reimbursement of out-of-pocket expenses; and (e) income to Sponsor
from a Sublicensee for commercial manufacturing of goods if such goods are intended for resale to third parties and the revenue derived
from sales of such goods will be treated as Net Sales and subject to an earned royalty due to Buck. In addition, Sponsor shall have the right
to deduct from Net Sublicensing Income withholding taxes and other taxes, duties and similar amounts owing with respect to payments
included within Net Sublicensing Income, but excluding what are commonly referred to as income taxes.

1.20

“Patent Product” shall mean a Licensed Product (a)(i) the manufacture, sale or use of which would but for the license
granted herein, infringe a Valid Claim of the Patent Rights, or (ii) whose discovery or development was enabled by the use of a Proprietary
Research Tool (a “Tool Product”), or (b) that meets the definition of “Patent Product” under the Mayo License as the same exists as of the
Effective Date.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

4

1.21

“Patent Rights” shall mean any and all rights in and to:

(a)

all patents and patent applications listed in Exhibit A hereto together with any other patents and patent

applications developed in the laboratory of Dr. Judith Campisi at Buck that are owned or controlled by Buck as of the Effective Date and that
claim inventions claimed or disclosed in the patent(s) and patent application(s) on Exhibit A (collectively, the “Existing Patents”); and

for which Sponsor exercises its option thereunder (“Campisi Research Agreement Patents”); and

(b)

all patents and patent applications claiming inventions developed pursuant to Campisi Research Agreement

which Sponsor exercises its option under Section 7.6.2 thereof (“Melov Research Agreement Patents”); and

(c)

all patents and patent applications claiming inventions developed pursuant to Melov Research Agreement for

its option pursuant to Section 2.2 (“Additional Invention Patents”); and

(d)

all patents and patent applications claiming Additional Inventions with respect to which Sponsor exercised

(e)

all divisions, continuations, continuations-in-part (to the extent entitled to the priority date of any of the

Existing Patents, Research Agreement Patents, or Additional Invention Patents), patents of addition, and substitutions of the Existing Patents
or Research Agreement Patents, or Additional Invention Patents together with all registrations, reissues, reexaminations or extensions of any
kind with respect to any of the foregoing patents; and

Agreement Patents, or Additional Invention Patents issued by or filed in any country or jurisdiction other than the United States.

(f)

all counterparts, including supplemental protection certificates, to any of the Existing Patents, Research

In the event that Buck and Sponsor are joint owners of an invention by reason of the fact that personnel of both Buck and Sponsor are joint
inventors of such invention, it is understood that the Patent Rights include only Buck’s rights as a joint owner of the patent applications and
patents that claim such joint invention.

1.22

“Phase I Clinical Study” shall mean any study in humans the principal purpose of which is preliminary determination

of safety in healthy individuals or patients as described under 21 C.F.R. §312.21(a) with respect to the United States, or, with respect to a
jurisdiction other than the United States, a similar clinical study, in each case which shall be deemed commenced when the first participant in
such study has received his or her initial dose of a Licensed Product.

1.23

“Phase II Clinical Study” shall mean a preliminary efficacy and dose ranging human clinical study of a Licensed
Product in the target patient population, as described under 21 C.F.R. §312.21(b) with respect to the United States, or, with respect to a
jurisdiction other than the United States, a similar clinical study, in each case which shall be deemed commenced when the first subject in
such study has received his or her initial dose of such Licensed Product.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

5

1.24

“Phase III Clinical Study” shall mean a human clinical study designed as a pivotal study to confirm with statistical

significance the efficacy and safety of a Licensed Product with respect to a given indication, which study is performed for purposes of filing
an MAA for such Product for such indication as described under 21 C.F.R. §312.21(c) with respect to the United States, or, with respect to a
jurisdiction other than the United States, a similar clinical study, in each case which shall be deemed commenced when the first subject in
such study has received his or her initial dose of such Licensed Product.

1.25

“Proprietary Research Tool” shall mean (a) a Research Tool existing as of the Effective Date and listed on Exhibit C,

and (b) any future Research Tool used to discover or develop Patent Products and which Sponsor elects to designate as a Proprietary
Research Tool pursuant to Section 2.4.

1.26

“Proprietary Research Tool Patents” shall mean the Patent Rights claiming the Proprietary Research Tools. A list of
the Proprietary Research Tool Patents existing as of the Effective Date and organized by the Proprietary Research Tool which they cover, is
attached hereto as Exhibit C.

1.27

“Regulatory Authority” means a federal, national, multinational, state, provincial or local regulatory agency,
department, bureau or other governmental entity with authority over the discovery, development, commercialization or other use or
exploitation (including review and approval of MAAs) of pharmaceutical products in any jurisdiction, including the FDA, EMA, and the
MHLW.

1.28

“Research Agreement Patents” means the Campisi Research Agreement Patents and the Melov Research Agreement

Patents.

1.29

“Research Tool” means animal models (e.g., a transgenic mouse), cell lines, monoclonal antibodies, research assays

and reagents, cloning tools, and similar materials whose primary utility is in the conduct of basic scientific research.

1.30

“Research Tool Patent Claim” shall mean a claim of a Research Agreement Patent or Additional Invention Patent that

claims a Research Tool that has not been designated as a Proprietary Research Tool by Sponsor pursuant to Section 2.4.

1.31

“Royalty Product” shall mean a Patent Product or a Know-How Product

1.32

“Sublicensee” shall mean any non-Affiliate third party to whom Sponsor has granted the right to promote, market and
sell Royalty Products pursuant to Section 2.3, and “Sublicense” shall mean an agreement or arrangement between Sponsor and a Sublicensee
granting such rights.  As used in this Agreement, “Sublicensee” shall not include (i) wholesalers or (ii) any resellers of Royalty Product(s)
that do not market and promote such Royalty Product(s).

1.33

“Valid Claim” shall mean a claim of an issued and unexpired patent or a claim of a pending patent application which
has not been held unpatentable, invalid or unenforceable by a court or other government agency of competent jurisdiction and has not been
admitted to be invalid or unenforceable through reissue, re-examination, disclaimer or otherwise; provided,

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

6

however, that if the holding of such court or agency is later reversed by a court or agency with overriding authority, the claim shall be
reinstated as a Valid Claim with respect to Net Sales made after the date of such reversal. Notwithstanding the foregoing provisions of this
Section 1.33, if a claim of a pending patent application within the Patent Rights has not issued as a claim of an issued patent within the
Patent Rights, within seven (7) years after the filing date from which such claim takes priority, such pending claim shall not be a Valid Claim
for purposes of this Agreement.

2.1

License Grants.

ARTICLE 2

LICENSE

(a)

Subject to the terms and conditions of this Agreement, including Sections 2.2, 2.5 and 2.6 below, Buck

hereby grants to Sponsor a worldwide, royalty-bearing, exclusive license, with the right to sublicense solely in accordance with Section 2.3,
under the Patent Rights (excluding the Research Tool Patent Claims), the Research Agreement Know-How and the Proprietary Research
Tools to: (i) develop, make, use, sell, import, export or otherwise distribute Royalty Products, and (ii) practice any method, process or
procedure covered or claimed by such Patent Rights or included in the Research Agreement Know-How, including the use of Proprietary
Research Tools to discover Royalty Products, in each case solely within the Field.

(b)

Subject to the terms and conditions of this Agreement, Buck hereby grants to Sponsor a worldwide, royalty-
bearing, non-exclusive license, with the right to sublicense solely in accordance with Section 2.3, under the Research Tool Patent Claims, the
Existing Know-How and the Additional Know-How solely to (i) develop, make, use, sell, import, export or otherwise distribute Royalty
Products, and (ii) practice any method, process or procedure included in the Research Tool Patent Claims, the Existing Know-How and the
Additional Know‑How, in each case solely within the Field.

2.2

Option to Additional Inventions.

(a)

Subject to the terms of this Section 2.2, Sponsor shall have an option to include within the license granted to

Sponsor under Section 2.1 above, all worldwide patent rights owned or controlled by Buck with respect to Additional Inventions, in each
case provided that the inclusion of such rights within the license granted to Sponsor under Section 2.1 above would not (in the reasoned legal
opinion of Buck’s legal counsel) result in (i) a violation of the terms of any pre‑existing written agreement between Buck and any third party,
or (ii) the loss of Buck’s ability to issue or maintain tax-exempt bonds under the 1986 Tax Reform Act.

(b)

Buck shall notify Sponsor promptly in writing of all Additional Inventions and shall provide Sponsor with a

suitable description and other information reasonably requested by Sponsor for the purpose of evaluating such Additional Inventions for
purposes of its option (such notice and accompanying information, an “Invention Disclosure”).

ninety (90) days after receiving from Buck a reasonably

(c)

To exercise its option with respect to a particular Additional Invention, Sponsor shall so notify Buck within

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

7

complete Invention Disclosure of its option exercise for such invention. Following such exercise, all patent applications and/or patents
owned or controlled by Buck directed to such invention shall, to extent such rights are not ineligible (pursuant to Section 2.2(a)(i) or (ii)
above) for inclusion within the license granted to Sponsor under Section 2.1, be deemed included within the Patent Rights.

(d)

In the event that a question arises as to whether a particular discovery or invention is necessary or reasonably
useful for the development, manufacture or commercialization of Licensed Products within the Field, the Parties agree that the Buck Head of
Business Development shall have the right to make the final decision on such matter, and in the event that the Buck Head of Business
Development determines that such discovery or invention is not in fact necessary or reasonably useful for the development, manufacture or
commercialization of Licensed Products within the Field, such discovery or invention shall not be considered an “Additional Invention” and
shall not be subject to Sponsor’s option under this Section 2.2.

2.3

Sublicenses. Sponsor may grant and authorize sublicenses within the scope of the license granted to Sponsor pursuant
to this Agreement, provided that: (i) Sponsor promptly discloses to Buck the identity of the Sublicensee and delivers a true and correct copy
of each sublicense granted by Sponsor as permitted herein, and any modification or termination thereof, within thirty (30) days after
execution, modification, or termination (which copy may only be redacted to delete information not relevant to determining whether such
sublicense is consistent with the provisions of this Agreement); (ii) Sponsor ensures that all sublicenses granted by Sponsor hereunder are
consistent with the terms and conditions of this Agreement and include provisions substantially identical to Sections 2.5 and 2.6, and Articles
10 and 11 with the Sublicensee in place of Sponsor; and (iii) Sponsor is responsible for the activities of such Sublicensees with respect to the
Licensed Subject Matter and the Licensed Products as if the activities were carried out by Sponsor, including the payment of royalties due to
Buck hereunder, whether or not such amounts are paid to Sponsor by a Sublicensee.

2.4

Designation of Additional Proprietary Research Tools.

(a)

Sponsor shall have the right upon written notice to Buck to designate any Research Tool arising under the
Buck Research Agreements, or subject to Section 2.2, an Additional Invention that is a Research Tool, as a Proprietary Research Tool, in
which case all patents and patent applications owned or controlled by Buck and directed to such Research Tool shall thereafter be deemed
Proprietary Research Tool Patents and such Research Tool, together with all patents and patent applications directed thereto, shall be
exclusively licensed to Sponsor.

(b)

To exercise its option to designate a particular Research Tool as a Proprietary Research Tool, Sponsor shall

provide Buck with written notice of such election at the time it exercises its option under the Campisi Research Agreement, Melov Research
Agreement or Section 2.2 above, as applicable, to include such Research Tool within the licenses granted to Sponsor under Section 2.1
above.

2.5

Retained Rights. Buck hereby retains a non-exclusive, non-transferrable right under the Patent Rights to (a) use and

practice the Patent Rights for its own educational and

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

8

non‑commercial research purposes; and (b) perform its research activities under the Buck Research Agreements.

2.6

Governmental Rights. The parties understand that the Licensed Subject Matter may have been developed under a

funding agreement with the Government of the United States and, if so, that the Government may have certain rights relative thereto under
35 U.S.C. §§ 200 et seq. Buck represents and warrants that it (i) has complied and agrees to continue to comply during the term of this
Agreement with all laws and regulations applicable to such a Government funding agreement and (ii) has done and will continue to do all
acts necessary for the protection of Buck’s rights to retain ownership of all inventions within the Licensed Subject Matter, including
disclosing subject inventions to the Government and electing to retain title in subject inventions.

2.7

No Implied Licenses. Nothing herein shall be construed as granting Sponsor, by implication, estoppel or otherwise, any

license or other right to any intellectual property of Buck other than the Licensed Subject Matter or to grant to Sponsor any right or license
other than those expressly granted herein.

2.8

Covenant. Sponsor covenants that it will not use or practice the Licensed Subject Matter except for the purposes

expressly permitted in the applicable license grant in this Article 2.

ARTICLE 3

PAYMENTS AND REPORTS

3.1

Equity. In consideration for the rights and licenses granted by Buck to Sponsor herein, Sponsor shall, within thirty (30)
days of the Effective Date and subject to Buck’s execution and delivery to Sponsor of a Stock Purchase Agreement in substantially the form
attached hereto as Exhibit B, issue to Buck Three Hundred Ninety Thousand (390,000) shares of Sponsor Common Stock promptly
following the Effective Date.

3.2

Minimum Annual Royalty Payments. As further consideration for the rights and licenses granted by Buck to Sponsor

herein, Sponsor shall pay to Buck an annual minimum royalty of [***] U.S. Dollars ($[***]). The first annual minimum royalty payment
shall be due within thirty (30) days of the fourth (4th) anniversary of the Effective Date, with subsequent annual minimum royalty payments
being due within thirty (30) days of each subsequent anniversary of the Effective Date until the expiration (or, if applicable, the earlier
termination) of this Agreement. Annual minimum royalty payments shall be non-refundable but shall be creditable against milestones owed
under Section 3.3, running royalties accrued under Section 3.5 and sublicensing fees owed under Section 3.7, in each case that have been
accrued and paid during the preceding one (1) year period.

3.3

Development Milestone Payments.

Buck the following payments upon the occurrence of each milestone specified below:

(a)

In consideration for the rights and licenses granted by Buck to Sponsor herein, Sponsor agrees to pay to

Development Milestone Event

Development Milestone Payment

1.Commencement of a Phase I Clinical Study for a Royalty Product

2.Commencement of a Phase II Clinical Study for a Royalty Product

3.Commencement of a Phase III Clinical Study for a Royalty Product

4.Acceptance of filing of an MAA by the FDA, EMA, or MHLW for a Royalty

Product

$[***]

$[***]

$[***]

$[***]

(b)

Development milestones 1-3 as set forth in Section 3.3(a) shall be payable once each for the first two (2)
Royalty Products to achieve the applicable milestone event. Milestone 4 shall be payable up to three (3) times for each of the first two (2)
Royalty Products (i.e., once per MAA filed and accepted for review by the Regulatory Authority in each of the first three distinct
jurisdictions in which an MAA is filed), for an aggregate of up to six (6) payments total. For clarity, Sponsor’s total payment obligations
under this Section 3.3 shall in no event exceed [***] U.S. Dollars ($[***]) (i.e., up to an aggregate total of $[***] under development
milestones 1-3 and up to an aggregate total of $[***] under development milestone 4).

(c)

Sponsor agrees to promptly notify Buck in writing of the occurrence of each of the foregoing milestones and

the payment for such milestone shall be due within thirty (30) days of occurrence thereof. All development milestone payments shall be
non‑refundable and non-creditable, and shall be payable in addition to the sales milestones, royalties and other payments due under this
Agreement. If, for whatever reason, a particular development milestone for which a milestone payment is due is not achieved then, in such
case, the milestone payment that Buck would have received upon the occurrence of such milestone event for the applicable Royalty Product
had the particular development milestone event been achieved shall be paid on the occurrence of the next development milestone event for
which a milestone payment is due for such Royalty Product, which payment shall be paid in addition to, and not instead of, the milestone
payment that is to be paid to Buck upon the occurrence of the next development milestone event.

3.4

Sales Milestones. In further consideration of the rights and licenses granted by Buck to Sponsor herein, Sponsor shall

pay Buck the following milestone payments upon achievement of the corresponding sales milestones:

($[***]), Sponsor shall pay Buck [***] U.S. Dollars ($[***]);

(a)

Upon first achieving aggregate Net Sales of a Royalty Product equal to or exceeding [***] U.S. Dollars

($[***]), Sponsor shall pay Buck [***] U.S. Dollars ($[***]);

(b)

Upon first achieving aggregate Net Sales of a Royalty Product equal to or exceedin g [***] U.S. Dollars

($[***]), Sponsor shall pay Buck [***] U.S. Dollars ($[***]);

(c)

Upon first achieving aggregate Net Sales of a Royalty Product equal to or exceeding [***] U.S. Dollars

9

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

($[***]), Sponsor shall pay Buck [***] U.S. Dollars ($[***]).

(d)

Upon first achieving aggregate Net Sales of a Royalty Product equal to or exceeding [***] U.S. Dollars

The foregoing sales milestones shall be payable once for each of the first two Royalty Products to achieve the applicable sales

thresholds. For clarity, Sponsor’s total payment obligations under this Section 3.4 shall in no event exceed [***] U.S. Dollars ($[***]).
Sponsor agrees to promptly notify Buck in writing of the occurrence of each of the foregoing milestones and the payment for such milestone
shall be included with the royalty payment due for the calendar quarter in which such sales milestone was achieved. All sales milestone
payments shall be non‑refundable and non‑creditable, and shall be payable in addition to the development milestones, royalties and other
payments due under this Agreement.

3.5

Earned Royalty. As additional consideration of the rights and licenses granted by Buck to Sponsor herein, except as

otherwise provided in this Article 3, Sponsor agrees to pay to Buck as running royalties a percentage of Net Sales as follows:

(a)

(b)

For Know-How Products: [***]% of annual Net Sales of Know‑How Products;

For Patent Products for which there are no Valid Claims within the Patent Rights or the Mayo Patent Rights

covering the composition of matter of the applicable Patent Product:

Annual Net Sales of Patent Product

Applicable Royalty Rate

Portion of worldwide annual Net Sales of such Patent Products less than or equal to [***] Dollars
(US$[***])

Portion of worldwide annual Net Sales of such Patent Products over [***] Dollars (US$[***])

[***]%

[***]%

Rights covering the composition of matter of the applicable Patent Product:

(c)

For Patent Products for which there is at least one Valid Claim within the Patent Rights or the Mayo Patent

Annual Net Sales of Patent Product

Applicable Royalty Rate

Portion of worldwide annual Net Sales of such Patent Products less than or equal to [***] Dollars
(US$[***])

Portion of worldwide annual Net Sales of such Patent Products over [***] Dollars (US$[***])

[***]%

[***]%

3.6

Certain Additional Terms.

(a)

Royalty Term.

(i)

Buck’s right to receive royalties under Section 3.5(c) above shall expire on a product-by-product

and country-by-country basis upon the expiration of the last to

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

10

expire Valid Claim in the Patent Rights or the Mayo Patent Rights covering the composition of matter of such Patent Product in such country.
Thereafter, if there is also at least one Valid Claim within the Patent Rights or the Mayo Patent Rights covering the method of making or
method of using the Licensed Product in such country and such Valid Claim is still in effect on the date on which the last-to-expire
composition of matter claim expires in such country, Sponsor will pay royalties on such Licensed Product at the royalty rate applicable for
Patent Products under Section 3.5(b) above until the date of expiration of the last-to-expire Valid Claim in the Patent Rights or the Mayo
Patent Rights covering the method of making or method of using such Licensed Product in such country. If the last-to-expire Valid Claim in
the Patent Rights or the Mayo Patent Rights covering the method of making or method of using such Licensed Product in such country
expires prior to the earlier of (A) the 13th anniversary of the First Commercial Sale of the first Royalty Product anywhere in the world or (B)
January 1, 2037, then to the extent that such Licensed Product satisfies the definition of a Know-How Product, Sponsor will, as of the date
on which such claim expires, continue to pay royalties on such Licensed Product at the royalty rate under Section 3.5(a) until the earlier of
(A) the 13th anniversary of the First Commercial Sale of the first Royalty Product anywhere in the world or (B) January 1, 2037. If there is
no unexpired Valid Claim within the Patent Rights or the Mayo Patent Rights covering the method of making or method of using the
Licensed Product as of the date of the last‑to‑expire composition of matter claim expires in such country, then to the extent that such
Licensed Product satisfies the definition of a Know-How Product, Sponsor will to pay royalties on such Licensed Product at the royalty rate
under Section 3.5(a) until the earlier of (1) the 13th anniversary of the First Commercial Sale of the first Royalty Product anywhere in the
world or (2) January 1, 2037.

(ii)

Buck’s right to receive royalties under Section 3.5(b) above shall expire on a product-by-product

and country-by-country basis upon the expiration of the last to expire Valid Claim in the Patent Rights or the Mayo Patent Rights covering
such Patent Product in such country, provided that with respect to any Patent Product that is a Tool Product, Buck shall be entitled to
continue to receive a royalty under Section 3.5(b) with respect to worldwide sales of such Patent Product until the expiration of the last to
expire Valid Claim of the Proprietary Research Tool Patent(s) covering the Proprietary Research Tool(s) whose use enabled the discovery or
development of such Patent Product. However, if Buck’s right to receive royalties under the preceding sentence expires prior to the earlier of
(A) the 13th anniversary of the First Commercial Sale of the first Royalty Product anywhere in the world or (B) January 1, 2037, then to the
extent that such Licensed Product satisfies the definition of a Know-How Product, Sponsor will, as of the date on which the last-to-expire
Valid Claim covering such Patent Product in such country expires or, if applicable and if in effect longer than the last-to-expire Valid Claim
covering such Patent Product, the last-to-expire Valid Claim of the applicable Proprietary Research Tool Patent, continue to pay royalties on
such Licensed Product at the royalty rate under Section 3.5(a) until the earlier of (1) the 13th anniversary of the First Commercial Sale of the
first Royalty Product anywhere in the world or (2) January 1, 2037.

Buck’s right to receive royalties under Section 3.5(a) above for a Know-How Product shall
expire on the earlier of (A) thirteen (13) years after the First Commercial Sale of the first Royalty Product anywhere in the world or (B)
January 1, 2037. For clarity, in the event that a Licensed Product is not covered in a country by a Valid Claim of the Patent Rights or the
Mayo Patent Rights but does meet the definition of a Know-How Product,

(iii)

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

11

then Buck’s right to receive royalties under Section 3.5(a) above shall expire on the earlier of the thirteen (13) year anniversary of the First
Commercial Sale of the first Royalty Product anywhere in the world or January 1, 2037.

the contrary in this Agreement:

(b)

Products Developed Post-Termination; Products Developed Post‑Acquisition. Notwithstanding anything to

(i)

in the event that Sponsor elects to permissively terminate this Agreement pursuant to Section 8.3,

any product Discovered by or on behalf of Sponsor following the second anniversary of the effective date of such termination shall not be
subject to the payment obligations set forth in Section 3.3-3.5 provided that Sponsor has complied with its obligations under Section 8.4(b)(i)
regarding the return to Buck of all Confidential Information of Buck. For clarity, any product Discovered by or on behalf of Sponsor (A)
prior to the second anniversary of the effective date of such termination, or (B) during any time period following the effective date of such
termination in which Sponsor is not in compliance with its obligations under Section 8.4(b)(i), shall to the extent such product satisfies the
definition of “Know‑How Product” (i.e., is a product for use in the Field that incorporates Know-How or was discovered through Sponsor’s
use of Know-How), be subject to the payment obligations set forth in Section 3.3‑3.5 as if such product were discovered during the Term;

(ii)

in the event of an acquisition, merger or consolidation (“Acquisition”) of Sponsor by or with a

third party (“Acquirer”), no payments will be owed under Section 3.3, 3.4, 3.5 and 3.7 with respect to any products (A) owned or controlled
by the Acquirer immediately prior to the effective date of such Acquisition, or (B) Discovered by Sponsor or such Acquirer following the
date of such Acquisition. For clarity, the foregoing shall not limit Buck’s rights to receive payments under Section 3.3, 3.4, 3.5 and 3.7 with
respect to any product(s) Discovered by Buck during the performance of the Buck Research Agreements.

later of (A) the date the structure of the active pharmaceutical ingredient (“API”) in such product is first determined, or (B) the date the
activity of such API is first experimentally established in animal model by Sponsor, Buck or Mayo.

(iii)

As used in this Section 3.6(b), a product will be deemed to have been “Discovered” upon the

(c)

Single Royalty; Non-Royalty Sales. In the event that a Licensed Product would be subject to two or more of

the royalty provisions in Sections 3.5 above (e.g., in the event a Licensed Product is covered by multiple Valid Claims, some of which are
composition of matter claims and some of which are not), only a single royalty shall be paid to Buck with respect to such Licensed Product,
that royalty being the highest of the royalties applicable to such Licensed Product. It is understood that royalties under Section 3.5(c) shall
only be payable with respect to Licensed Products whose sale would infringe a Valid Claim within the Patent Rights or the Mayo Patent
Rights covering the composition of matter of such Licensed Product in the country for which such Licensed Product is sold. In no event shall
more than one royalty be due hereunder with respect to any Licensed Product unit; nor shall a royalty be payable under this Article 3 with
respect to sales of Licensed Products for use in research and/or development, in clinical trials or as samples.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

12

(d)

Multiple Royalties. If Sponsor, its Affiliate or Sublicensee is required to pay a non-Affiliate third party other
than Mayo amounts with respect to a Licensed Product under agreements for patent rights or other technologies which Sponsor, its Affiliate
or Sublicensee, in its best judgment, determines are necessary or desirable to license or acquire with respect to such Licensed Product,
Sponsor may deduct such amount owing to such non‑Affiliate third parties (prior to any reductions) from the royalty owing to Buck for the
sale of such Licensed Product pursuant to Section 3.5 above. Notwithstanding the foregoing provisions of this Section 3.6, in no event shall
the royalties due to Buck pursuant to Section 3.5 above be so reduced to less than:

Licensed Products subject to Sections 3.5(a) or 3.5(b); or

(i)

[***] percent ([***]%) of the amount that would otherwise be due to Buck with respect to

Licensed Products subject to Section 3.5(c).

(ii)

[***] percent ([***]%) of the amount that would otherwise be due to Buck with respect to

(e)

Royalties on Mayo Licensed Products. Notwithstanding anything to the contrary in this Agreement, it is
understood and agreed that any Licensed Product identified or developed solely by Mayo shall only be subject to milestone and royalty
obligations under this Agreement if that product is subject to milestone and royalty obligations under the Mayo License Agreement as the
same exists as of the Effective Date.

3.7

Sublicense Fees.

(a)

(b)

Sponsor shall pay to Buck [***]% of the Net Sublicensing Income received by Sponsor or its Affiliates.

Notwithstanding the foregoing:

(i)

Sponsor shall only be obligated to pay to Buck [***] percent ([***]%) of that portion of the

aggregate Net Sublicensing Income that exceeds the then current aggregate duly documented and verifiable amount spent by Sponsor on the
development of Licensed Products as of the date such Net Sublicensing Income was received. For example, if Sponsor has spent $100,000
on the development of Licensed Products and receives $200,000 in Net Sublicensing Income, Sponsor shall only be obligated to pay to Buck
$[***]; and

($[***]).

(ii)

Sponsor’s total payment obligations under this Section 3.7 shall be capped at [***] U.S. Dollars

3.8

Combination Products. In the event that a Licensed Product is sold in combination with another product, component or

service for which no royalty would be due hereunder if sold separately (a “Combination Product”), Net Sales from such combination sales
for purposes of calculating the amounts due under this Article 3 shall be determined based on the proportionate list prices of such products,
components or services if sold separately. If a product, component or service that is part of the Combination Product sold is not sold
separately, then the “Net Sales” for the purpose of determining the royalty due shall be determined by multiplying the Net Sales of the
Combination Product by a fraction that reasonably represents the relative contribution, to the total market value of such Combination
Product, of the Licensed Product, where such

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

13

fraction is determined by the parties in good faith on the basis of the fair market values of the contribution of each of the different products,
components or services when included in the Combination Product.

3.9

Records. During the term of this Agreement, Sponsor and its Affiliates shall keep, and shall cause Sublicensees to keep,

complete and accurate records of their Net Sales in sufficient detail to enable the amounts payable under this Article 3 to be determined.
Sponsor will preserve, and will cause its Affiliates and Sublicensees to preserve, such records for at least three (3) years from the date of the
payment to which they pertain. Upon Buck’s written request, but not more frequently than once per calendar year, Sponsor shall permit
representatives or agents of Buck to examine such records during Sponsor’s regular business hours for the purpose of and to the extent
necessary to verify any report required under this Agreement with respect to Net Sales received not more than three (3) years prior to the
date of Buck’s request. To the extent that Sponsor does not have the right to grant Buck the right to audit its Sublicensees’ books and records
hereunder, Sponsor shall obtain for itself such right and, at the request of Buck and at Buck’s expense, Sponsor shall, through an independent
third party acceptable to Buck, exercise such audit right with respect to Sublicensees and provide the results of such audit for inspection by
Buck pursuant to this Section 3.9. In the event that the amounts due to Buck are determined to have been underpaid, Sponsor shall pay to
Buck any amount due and unpaid, together with interest on such amount at the prime rate in effect at [***], or at the maximum rate permitted
by law, whichever is lower, within thirty (30) days following the receipt of the audit results. Buck shall bear its own expenses in connection
with any audits conducted by Buck’s representatives or agents; provided, however, that if an error of more than [***] percent ([***]%) in
favor of Sponsor or its Affiliates or Sublicensees is discovered, then such expenses shall be paid by Sponsor.

3.10

Reports. Beginning with the first accrual of Net Sales on which a royalty is due hereunder, Sponsor shall provide to

Buck a quarterly royalty report as follows: Within sixty (60) days after the end of each calendar quarter, Sponsor shall deliver to Buck a true
and accurate report, giving such particulars of the business conducted by Sponsor, its Affiliates and Sublicensees, if any, during such
calendar quarter as are pertinent to account for royalties due under this Article 3. Such report shall include at least (i) the total of Net Sales
during such quarter in sufficient detail on a Product-by Product and country-by-country basis to permit confirmation of the accuracy of the
royalty payments due, including the number of Royalty Products sold, the gross sales of Royalty Products, and the deductions made from
gross sales to determine Net Sales; (ii) the calculation of royalties; and (iii) the total royalties so calculated and due Buck. Simultaneously
with the delivery of each such report, Sponsor shall pay to Buck the total royalties, if any, due to Buck for the period of such report. If no
royalties are due, Sponsor shall so report. All information contained in reports provided to Buck under this Section 3.10, or learned by Buck
under Section 3.9 above shall be Sponsor’s Confidential Information.

3.11

Payments. All amounts payable hereunder by Sponsor shall be payable in United States Dollars. If any currency

conversion of foreign currency sales into United States Dollars shall be required in connection with the payment of royalties hereunder, such
conversion shall be made by using the exchange rates used by Sponsor in calculating Sponsor’s own revenues for financial reporting
purposes.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

14

3.12

Exchange Control. If at any time legal restrictions prevent the prompt remittance of part or all of the royalties payable
by Sponsor with respect to any country or territory where a Licensed Product is sold, Sponsor shall have the right, at its option, to make such
payments by depositing the amount thereof in local currency to Buck’s account in a bank or other depository in such country. If the royalty
rate specified in this Agreement should exceed the permissible rate established in any country, the royalty rate for sales in such country shall
be adjusted to the highest legally permissible or government-approved rate.

3.13

Late Payment. Any amounts not paid by Sponsor when due under this Agreement will be subject to interest from and

including the date payment is due, up through and including the date upon which Buck has collected the funds in accordance herewith at a
rate equal to the lesser of (i) the sum of [***] percent ([***]%) plus the prime rate of interest in effect at Bank of America NT&SA, San
Francisco, California per annum, calculated daily, or (ii) the maximum interest rate allowed by law.

ARTICLE 4

DATA ACCESS

4.1

Promptly after the Effective Date, Buck shall, at Sponsor’s request, provide to Sponsor all data, reports, analyses and
other information in its possession or control that is within the Know-How. Subject to the provisions of Article 6 below, Sponsor will have
the right to use all such data and materials for the purposes set forth in the license rights granted to it in Article 2, and to provide the same to
third parties under obligations of confidentiality consistent with the obligations set forth in Article 6 and to Regulatory Authorities in
connection with obtaining approvals to develop, market and/or commercialize Licensed Products. In addition, as reasonably requested by
Sponsor from time to time, Buck shall deliver to Sponsor reasonable quantities of biological materials covered by the Licensed Subject
Matter based on availability, provided that Sponsor shall bear Buck’s costs of shipping such materials to Sponsor. Such materials shall be
supplied to Sponsor by Buck on an “as is” basis under a material transfer agreement, the terms of which shall be substantially similar to the
template material transfer agreement attached hereto as Exhibit D. Upon the termination of this Agreement, Sponsor shall, at Buck’s option,
either return to Buck any remaining biological materials provided to it by Buck hereunder or destroy such materials.

ARTICLE 5
DUE DILIGENCE

5.1

General Diligence Obligations. Sponsor shall use Commercially Reasonable Efforts to develop, file Marketing

Authorization Applications for, commercialize and meet the market demand for one or more Royalty Products.

5.2

Failure. If Sponsor does not use Commercially Reasonable Efforts as provided for in Section 5.1, then Buck shall have
the right to terminate this Agreement in its entirety for material breach in accordance with the procedures set forth in Section 8.2, or with the
consent of Sponsor, to convert to non-exclusive, the license rights granted to Sponsor hereunder.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

15

5.3

Reports. Within ninety (90) days following the end of each calendar year during the term of this Agreement, Sponsor

shall prepare and deliver to Buck a written report which shall describe, in reasonable detail, the research performed during the previous year
employing the Licensed Subject Matter or regarding Royalty Products, the progress of the development and exploitation of Licensed Subject
Matter and Royalty Products during the previous year, and the research activities regarding the Licensed Subject Matter and Royalty
Products planned for the current calendar year.

ARTICLE 6

CONFIDENTIALITY

6.1

Confidential Information. During the term of this Agreement and for a period of seven (7) years thereafter, and except

as otherwise provided herein, each party shall maintain in confidence, and shall not use for any purpose or disclose to any third party,
information of a confidential or proprietary nature that is disclosed by the other party that (a) if in written or other tangible form is marked
“Confidential,” “Proprietary” or in some other manner to indicate its confidential nature, or (b) that, given the nature of the information or
the circumstances surrounding its disclosure, reasonably should be considered as confidential (collectively, “Confidential Information”).
Confidential Information shall not include any information that is: (i) already known to the receiving party without obligations of
confidentiality thereto at the time of disclosure hereunder as demonstrated by competent proof, or (ii) is or hereafter becomes publicly known
other than through acts or omissions of the receiving party, or (iii) is disclosed to the receiving party without obligations of confidentiality by
a third party under no obligation of confidentiality, whether direct or indirect, to the disclosing party, or (iv) is independently developed by
the receiving party without reliance on or reference to the Confidential Information of the disclosing party, as demonstrated by competent
proof. The party receiving a disclosing party’s Confidential Information shall maintain such Confidential Information in confidence and shall
disclose such Confidential Information only to its employees, agents, independent contractors, Affiliates, sublicensees, attorneys,
accountants, and advisors who have a reasonable need to know such Confidential Information and who are bound by obligations of
confidentiality and non-use no less restrictive than those set forth herein.

6.2

Permitted Usage and Disclosure. Notwithstanding the provisions of Section 6.1 above, the receiving party may use

Confidential Information of the disclosing party to the extent necessary to exercise its rights hereunder (including commercialization and/or
sublicensing of Licensed Subject Matter) or fulfill its obligations and/or duties hereunder and in filing for, prosecuting or maintaining any
proprietary rights, and may disclose such Confidential Information of the disclosing party (a) as required, in connection with the order of a
court or other governmental body; (b) as required by or in compliance with laws or regulations; and (c) in the case of Sponsor, as required in
the course of obtaining regulatory and necessary institutional approvals to clinically test, sell or market Licensed Products or to perform
research and development with respect to the Licensed Products as permitted under this Agreement, provided that if the receiving party is
required by law, regulation or order of a court or other governmental body to make any public disclosures of Confidential Information of the
disclosing party, the receiving party will, to the extent it may legally do so, give reasonable advance notice to the disclosing party of such
disclosure and will use its reasonable efforts to secure confidential

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

16

treatment of Confidential Information prior to its disclosure (whether through protective orders or otherwise).

6.3

Residuals. Nothing in this Agreement shall restrict any employee or representative of Sponsor from using Know How

retained in the unaided memory of such employee or representative following the termination of this Agreement. A person’s memory is
“unaided” if such person has not intentionally memorized the Confidential Information for the purpose of retaining and subsequently using
or disclosing it.

ARTICLE 7

PATENTS AND INVENTIONS

7.1

Prosecution of Patent Rights. Buck shall, through patent counsel reasonably acceptable to Sponsor, direct and control

the filing, prosecution and maintenance of all Patent Rights. For purposes of this Article 7, “prosecution and maintenance” of patents and
patent applications shall be deemed to include, without limitation, the conduct of interferences or oppositions, and/or requests for re-
examinations, reissues or extensions of patent terms. Buck shall provide Sponsor with (a) a copy of all patent applications within the Patent
Rights prior to filing such application, allowing adequate time for review and comment by Sponsor unless it is impracticable; (b) copies of
all material correspondence from any and all patent offices concerning any Patent Rights and, if applicable, an opportunity to comment on
any proposed responses, voluntary amendments, and submissions of any kind to be made to any and all patent offices and (c) the right to
directly consult with patent counsel. Buck and its patent counsel shall incorporate all reasonable comments provided by Sponsor under this
Section 7.1.

7.2

Patent Costs. Sponsor acknowledges and agrees that the license granted hereunder is in partial consideration for

Sponsor’s assumption of the costs of prosecution and maintenance of the Patent Rights as described herein. Sponsor agrees to pay and shall
pay for all reasonable out-of-pocket expenses incurred by Buck in connection with the prosecution and maintenance of the Patent Rights on
or after the Effective Date (including the costs of reexamination, opposition and interference proceedings). In addition, on or before June 30,
2014 Sponsor shall reimburse Buck for all previously unreimbursed expenses incurred by Buck in connection with the prosecution and
maintenance of the Existing Patent Rights prior to the Effective Date (“Past Patent Costs”), provided that Licensee’s payment obligations
with respect to such Past Patent Costs shall in no event exceed $[***]. If at any time Sponsor determines that it no longer desires to pay the
patent costs with respect to one or more patents or patent applications within the Patent Rights, Sponsor shall give sixty (60) days advance
written notice to Buck. Upon such notice, Buck shall use commercially reasonable efforts to minimize any additional patent costs, provided
that Buck shall be free to continue the filing, prosecution, and/or maintenance of such applications(s) or patent(s) at its own expense. If Buck
elects to exercise its back-up rights under the preceding sentence to file, prosecute or maintain any patent application or patent within the
Patent Rights in a Major Country, Sponsor’s license with respect to such patent or patent application shall terminate in such country. For
clarity, Sponsor shall not be obligated to pay for any corresponding patent costs incurred after the end of such sixty (60) day period (but shall
remain responsible for all patent costs incurred prior to and during such sixty (60) day period). Sponsor will pay all undisputed invoices for
patent expenses incurred in accordance with this Article 7 within thirty (30) days of receipt of an invoice from Buck. If Sponsor fails to pay
any

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

17

undisputed invoices with respect to one or more patents or patent applications within the Patent Rights, Sponsor’s license with respect to
such patent or patent application shall terminate. As used in this Section 7.2, “Major Country” shall mean the United States, Canada, United
Kingdom, France, Germany, Italy, Spain, Australia and Japan.

ARTICLE 8

TERM AND TERMINATION

8.1

Term. Unless terminated earlier pursuant to this Article 8, the term of this Agreement shall commence on the Effective

Date, and will continue in full force and effect until the expiration of Sponsor’s payment obligations hereunder, unless earlier terminated
pursuant to Section 8.2 or 8.3 below. Sponsor’s license with respect to the Know-How shall survive the expiration (but not an earlier
termination, except as provided in Section 8.4 below) of this Agreement and for clarity shall thereafter be fully paid-up, royalty free and
irrevocable.

8.2

Termination for Breach. In the event of a material breach of this Agreement, the non‑breaching party shall be entitled to

terminate this Agreement by written notice to the breaching party, if such breach is not cured within sixty (60) days after written notice is
given by the non‑breaching party to the breaching party specifying the breach and requesting its cure. However, if the party alleged to be in
breach of this Agreement disputes such breach within such sixty (60) day period, the non-breaching party shall not have the right to
terminate this Agreement unless it has been determined by a court of competent jurisdiction that this Agreement was materially breached,
and the breaching party fails to cure such breach within sixty (60) days after such determination.

8.3

Termination by Sponsor. Any provision herein notwithstanding, Sponsor may terminate this Agreement, in its entirety
or as to any particular Licensed Product, at any time by giving Buck at least sixty (60) days prior written notice. From and after the effective
date of a termination under this Section 8.3 with respect to a particular Licensed Product, the license granted under Section 2.1 above shall
terminate with respect to such Licensed Product.

8.4

Survival.

the time of such termination has already accrued to the other party.

(a)

Termination of this Agreement for any reason shall not release either party hereto from any liability which at

(b)

In the event this Agreement is terminated for any reason:

Sponsor and Buck shall each return to the other all Confidential Information they have received
from the other party, provided that one (1) copy of such Confidential Information may be retained by the receiving party for the purpose of
complying with continuing obligations under this Agreement.

(i)

Sponsor shall provide Buck with a written inventory of all Royalty Products that Sponsor and its
Affiliates have in process of manufacture, in use or in stock and Sponsor and its Affiliates shall have the right to sell or otherwise dispose of
such Royalty Products, all subject to the payment to Buck of royalties pursuant to Article 3 hereof.

(ii)

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

18

Upon termination of this Agreement by Buck for any reason, any sublicense granted by Sponsor hereunder
shall survive, provided that upon request by Buck, such Sublicensee promptly agrees in writing to be bound by the applicable terms of this
Agreement.

(c)

(d)

Articles 1, 6, 10, 11 and 13 and Sections 8.4, 9.1 and 9.3 (with respect to any enforcement actions in

progress at the time of termination), and 12.3 shall survive the expiration and any termination of this Agreement. Additionally, in the event
Sponsor elects to permissively terminate this Agreement in its entirety pursuant to Section 8.3, all payment obligations of Sponsor under
Sections 3.3, 3.4 and 3.5 with respect to Tool Products and Know‑How Products Sponsor elects to continue to develop and commercialize
after termination shall survive termination of this Agreement (and Sponsor’s non-exclusive license under Section 2.1(b) shall survive with
respect to such Tool Products and Know-How Products). Except as otherwise provided in this Article 8, all rights and obligations of the
parties under this Agreement shall terminate upon the expiration or termination of this Agreement.

ARTICLE 9
INFRINGEMENT

9.1

Enforcement. If either party becomes aware of a suspected infringement of any of the Patent Rights, that party shall

promptly notify the other party in writing and the parties will meet and confer.

(a)

Sponsor shall have the first right (itself or through others), at its sole option and expense, to bring suit to

enforce the Patent Rights, and/or to defend any declaratory judgment action with respect thereto, in each case with respect to the
manufacture, sale or use of a product within the Field; provided, however, that Sponsor shall keep Buck reasonably informed as to the
defense and/or settlement of such action. Buck shall have the right to participate in any such action with counsel of its own choice at its own
expense. All recoveries received by Sponsor from an action to enforce the Patent Rights shall be first applied to reimburse Sponsor’s and
then Buck’s unreimbursed expenses, including without limitation, reasonable attorney’s fees and court costs. Any remainder shall, to the
extent the same pertains to an infringement of the Patent Rights, be divided [***] percent ([***]%) to Sponsor and [***] percent ([***]%) to
Buck, provided that Buck’s portion shall not exceed the amount Buck would have received as a royalty hereunder if the infringing activities
had been made by Sponsor.

(b)

In the event Sponsor elects not to initiate an action to enforce the Patent Rights against a Third Party for

infringement within the Field within six (6) months of a request by Buck to do so, (or within such shorter period which may be required to
preserve the legal rights of Buck under the laws of the relevant government), Buck may with Sponsor’s consent, which consent shall not be
unreasonably withheld, initiate such action at its own expense, in its own name, and under its own direction and control. Sponsor shall have
the right to participate in any such action with counsel of its own choice at its own expense. All recoveries received by Buck from any such
action shall be first applied to reimburse Buck’s and then Sponsor’s unreimbursed expenses, including without limitation, reasonable
attorney’s fees and court costs. Any remainder shall, to the extent the same pertains to an infringement of the Patent Rights in the Field, be
divided [***] percent ([***]%) to Sponsor and [***] percent ([***]%) to Buck.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

19

(c)

If the suspected infringement by a Third Party is not with respect to the manufacture, sale or use of a product

within the Field, Buck will have the right, but not the obligation, to bring an infringement action at its own expense, in its own name, and
entirely under its own direction and control.

9.2

Defense. If Sponsor, its Affiliate, Sublicensee, distributor or other customer is sued by a third party charging

infringement of patent rights that dominate a claim of the Patent Rights or that cover other Related Material with respect to the manufacture,
use, distribution or sale of a Royalty Product, Sponsor will promptly notify Buck. As between the parties to this Agreement, Sponsor will be
entitled to control the defense in any such action(s). If Sponsor is required to pay any settlements or damages to a third party in connection
with such infringement action, then an amount equal to [***] percent ([***]%) of the amount of such settlements or damages actually paid to
such third party by Sponsor (or its Affiliate or Sublicensee) with respect to such alleged infringement shall be offset against the amount of
royalties otherwise owed to Buck with respect to the applicable Royalty Product; provided that the effective royalty rate due to Buck under
Section 3.5, taking into account such offset and any other royalty reduction provided for in Section 3.6, if applicable, shall not be reduced by
more than [***] percent ([***]%) or the rates specified in Section 3.5.

9.3

Cooperation. In any suit, action or other proceeding in connection with enforcement and/or defense of the Patent Rights

as permitted under this Article 8, Buck shall cooperate fully, including without limitation by joining as a party plaintiff and executing such
documents as Sponsor may reasonably request. Upon the request of and, at the expense of the party enforcing or defending the Patent Rights,
the other party shall make available at reasonable times and under appropriate conditions all relevant personnel, records, papers, information,
samples, specimens and other similar materials in the other party’s possession.

9.4

No Implied Obligations. Except as expressly provided in this Article 9, neither party has any obligation to bring or

prosecute actions or suits against any third party for patent infringement.

ARTICLE 10
INDEMNIFICATION

Sponsor shall hold harmless, indemnify and defend Buck and its Affiliates, trustees, directors, officers, employees, and agents and

the successor and assigns of any of the foregoing (collectively, the “Indemnitees”) from and against any and all liabilities, damages,
penalties, expenses and/or losses, including reasonable attorneys’ fees and other expenses of litigation resulting from any claims, actions,
suits, or proceedings brought by third parties (any of the foregoing, a “Claim”) against any Indemnitee, arising from or occurring as a result
of (a) the exercise or practice of the rights and licenses granted under this Agreement by Sponsor or its Affiliates or Sublicensees, including,
without limitation, the research, development, possession, storage, transport, importation, use, sale, marketing or distribution of Royalty
Products, (b) a breach of any of Sponsor’s obligations, representations or warranties under this Agreement, or (c) the negligence,
recklessness or intentional misconduct of Sponsor, its Affiliates or Sublicensees in connection with this Agreement, but specifically
excluding Claims, arising from or occurring as a result of a breach of any of Buck’s obligations, representations or warranties

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

20

under this Agreement or the gross negligence, recklessness or intentional misconduct of Buck or its Affiliates; provided that an Indemnitee
that intends to claim indemnification under this Article 10 shall: (i) promptly notify Sponsor in writing of any Claim with respect to which
the Indemnitee intends to claim such indemnification, (ii) give Sponsor sole control of the defense and/or settlement thereof, and (iii) provide
Sponsor, at Sponsor’s expense, with reasonable assistance and full information with respect to such Claim. Sponsor shall not settle any
claim, suit or proceeding subject to this Article 10 or otherwise consent to an adverse judgment in such claim, suit or proceeding if the same
materially diminishes the rights or interests of the Indemnitee without the express written consent of the Indemnitee. Notwithstanding the
foregoing, Sponsor shall have no obligations for any Claim if the Indemnitee seeking indemnification makes any admission or settlement
regarding such Claim without the prior written consent of Sponsor, which consent shall not be unreasonably withheld.

ARTICLE 11

USE OF NAMES

Except as required by law or in the normal course of business identification, neither Sponsor nor Buck shall issue any press
release or other written statements in connection with this Agreement intended for use in the public media in a manner suggesting any
endorsement by the other of Sponsor or Buck (including Buck), respectively, without the approval of such other party, which approval shall
not be unreasonably withheld.

ARTICLE 12

REPRESENTATIONS AND WARRANTIES

12.1

Warranties by Buck. Buck represents and warrants that (i) Buck has the sole right and authority to enter into this

Agreement and grant the rights and licenses hereunder; (ii) Buck has not previously granted and will not grant any rights in the Licensed
Subject Matter that are inconsistent with the rights and licenses granted to Sponsor herein; (iii) to its knowledge, there are no claims of third
parties as of the Effective Date that would call into question the rights of Buck to grant to Sponsor the rights contemplated hereunder; and
(iv) to its knowledge, except for the Patent Rights, as of the Effective Date, Buck does not own or control any patent or patent application
(including any invention disclosure or draft patent application for which a patent application is intended to be filed) the claims of which
would dominate any practice of the Licensed Subject Matter.

12.2

Mutual Warranties. Each party hereby represents and warrants as of the Effective Date:

power and authority to enter into this Agreement and to carry out the provisions hereof.

(a)

it is duly organized and validly existing under the laws of its state of incorporation and has full corporate

person executing this Agreement on its behalf has been duly authorized to do so by all requisite corporate action.

(b)

it is duly authorized to execute and deliver this Agreement and to perform its obligations hereunder. The

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

21

(c)

This Agreement is a legal and valid obligation binding upon it and enforceable in accordance with its terms.

The execution, delivery and performance of this Agreement by it do not conflict with any agreement, instrument or understanding, oral or
written, to which it or any of its Affiliates is a party or by which it or any of its Affiliates may be bound.

12.3

Disclaimer. EXCEPT AS PROVIDED IN THIS ARTICLE 12, NEITHER PARTY MAKES ANY WARRANTIES
OR CONDITIONS (EXPRESS, IMPLIED, STATUTORY OR OTHERWISE) WITH RESPECT TO THE SUBJECT MATTER HEREOF,
AND BUCK SPECIFICALLY DISCLAIMS ANY AND ALL IMPLIED WARRANTIES OR CONDITIONS OF MERCHANTABILITY
AND FITNESS FOR A PARTICULAR PURPOSE, AND ALL WARRANTIES AND CONDITIONS OF THE VALIDITY OF THE
LICENSED SUBJECT MATTER OR NONINFRINGEMENT OF THIRD PARTY INTELLECTUAL PROPERTY RIGHTS.

ARTICLE 13

GENERAL

13.1

Patent Marking. Sponsor agrees to mark, and require its Affiliates and Sublicensees to mark, all Royalty Products sold

with all applicable patent numbers within the Patent Rights or otherwise conform to patent laws and practices of the country in which such
Royalty Product is sold.

13.2

No Implied Obligations. Sponsor’s sole obligation to exploit the Licensed Subject Matter is as set forth in Article 5.
Nothing in this Agreement shall be deemed to require Sponsor to otherwise exploit the Licensed Subject Matter nor prevent Sponsor from
commercializing products similar to or competitive with a Licensed Product.

13.3

Independent Contractors. The relationship of Buck and Sponsor established by this Agreement is that of independent

contractors. Nothing in this Agreement shall be construed to create any other relationship between Buck and Sponsor. Neither party shall
have any right, power or authority to assume, create or incur any expense, liability or obligation, express or implied, on behalf of the other.

13.4

Confidential Terms. Except as expressly provided herein, each party agrees not to disclose any terms of this

Agreement to any third party without the consent of the other party, except as required by securities or other applicable laws, to prospective
and other investors and such party’s accountants, attorneys and other professional advisors.

13.5

Assignment. This Agreement may not be assigned by a party without the prior written consent of the other party

except to a party that succeeds to all or substantially all of the assigning party’s business or assets relating to this Agreement whether by sale,
merger, operation of law or otherwise; provided that such assignee or transferee promptly agrees in writing to be bound by the terms and
conditions of this Agreement. Buck may assign its right to receive payments hereunder upon prior written notice to Sponsor.

13.6

Force Majeure. In the event either party hereto is prevented from or delayed in the performance of any of its

obligations hereunder by reason of acts of God, war, strikes, riots, storms, fires, or any other cause whatsoever beyond the reasonable control
of the party, the party

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

22

so prevented or delayed shall notify the other party as soon as reasonably possible, be excused from the performance of any such obligation
to the extent and during the period of such prevention or delay, and resume performance hereunder as soon as reasonably possible following
cessation of such event or occurrence. Notwithstanding the foregoing, a party shall not be excused from the performance of any of its
payment obligations under this Section 13.6.

13.7

Notices. Any notice or other communication required by this Agreement shall be made in writing and given by

prepaid, first class, certified mail, return receipt requested, or by reputable express courier and shall be deemed to have been served on the
date received by the addressee at the following address or such other address as may from time to time be designated to the other party in
writing:

If to Buck:

If to Sponsor:

with a copy to:

Buck Institute for Research on Aging 
8001 Redwood Boulevard 
Novato, California 94945 
Attention: VP, Business Development

Unity Biotechnology, Inc. 
3280 Brisbane Blvd 
Brisbane, California 94005 
Attention: CEO

Wilson Sonsini Goodrich & Rosati 
650 Page Mill Road 
Palo Alto, California 94304-1050 
Attention: [***].

13.8

Compliance with Law. Sponsor shall comply with all applicable federal, state and local laws and regulations in

connection with its activities pursuant to this Agreement.

13.9

Governing Law. This Agreement shall be governed by, and construed and interpreted in accordance with, the laws of

the State of California, without reference to its principles of conflicts of law.

13.10

No Waiver. No waiver hereunder shall be effective unless made in writing and signed by the waiving party. In

addition, any such written waiver shall not constitute or be deemed to be a waiver of any other right hereunder or of any other failure to
perform or breach hereof by such other party, whether of a similar or dissimilar nature thereto.

13.11

Limitation of Liability. NEITHER PARTY SHALL BE LIABLE TO THE OTHER PARTY OR ANY THIRD

PARTY FOR ANY SPECIAL, CONSEQUENTIAL, EXEMPLARY OR INCIDENTAL DAMAGES (INCLUDING LOST OR
ANTICIPATED REVENUES OR PROFITS RELATING TO THE SAME), ARISING FROM ANY CLAIM RELATING TO THIS
AGREEMENT, WHETHER SUCH CLAIM IS BASED ON CONTRACT, TORT (INCLUDING NEGLIGENCE) OR OTHERWISE,
EVEN IF AN AUTHORIZED REPRESENTATIVE OF SUCH PARTY IS ADVISED OF THE POSSIBILITY OR LIKELIHOOD OF
SAME. THE FOREGOING LIMITATION SHALL NOT APPLY, HOWEVER, TO A PARTY’S INDEMNIFICATION OBLIGATIONS
PURSUANT

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

23

TO ARTICLE 9 OR TO A BREACH OF A PARTY’S CONFIDENTIALITY OBLIGATIONS UNDER ARTICLE 6. IN NO EVENT WILL
BUCK’S LIABILITY ARISING OUT OF OR IN CONNECTION WITH THIS AGREEMENT EXCEED THE TOTAL COMPENSATION
THAT HAS BEEN PAID TO BUCK BY SPONSOR AS OF THE DATE OF FILING AN ACTION AGAINST BUCK THAT RESULTS IN
A SETTLEMENT OR AWARD OF DAMAGES TO SPONSOR.

13.12

Headings. Headings included herein are for convenience only, do not form a part of this Agreement and shall not be

used in any way to construe or interpret this Agreement.

13.13

Severability. If any provision of this Agreement shall be found by a court to be void, invalid or unenforceable, the
same shall be reformed to comply with applicable law or stricken if not so conformable, so as not to affect the validity or enforceability of
the remainder of this Agreement. In such event, the parties will in good faith negotiate a substitute clause for any provision declared invalid
or unenforceable, which will most nearly approximate the intent of the parties in entering this Agreement.

13.14

Entire Agreement. This Agreement constitutes the entire understanding and agreement between the parties with

respect to the subject matter hereof and supersedes any and all prior negotiations, representations, agreements, and understandings, written or
oral, that the parties may have reached with respect to the subject matter hereof. No agreements altering or supplementing the terms hereof
may be made except by means of a written document signed by the duly authorized representatives of each of the parties hereto. It is
understood that the Buck Research Agreements are separate and independent from this Agreement and termination of either agreement shall
not operate to terminate or otherwise affect the rights and obligations of the parties under the other agreement.

13.15

Counterparts. This Agreement may be executed in counterparts, each of which shall be deemed an original, but both

of which together shall constitute one and the same instrument. Counterparts may be signed and delivered by facsimile or via email in
Portable Document Format (PDF), each of which will be binding when sent.

13.16

Insurance. Prior to the commencement of any human clinical trials of a Royalty Product, Sponsor shall obtain a

product/clinical trial liability insurance policy in good standing and adequate to cover its obligations hereunder and which are consistent with
normal business practices of prudent companies similarly situated, during the period in which Sponsor is performing clinical studies
(including any follow-up care) of Royalty Product (the “Trial Period”). Such policy shall remain in effect during the Trial Period and for
ninety (90) days thereafter, and shall, to the extent written on a claims-made form, provide for a three (3) year tail covering circumstances,
incidents, and/or claims arising from activities occurring prior to the termination of such policy. In any event, Sponsor shall name Buck as an
additional insured on such policy and shall require the insurer to provide written notice to Buck within sixty (60) days of any change in or
termination of such policy that would negatively impact the coverage of Sponsor under such policy. Sponsor shall provide a copy of such
policy to Buck at least ninety (90) days prior to the commencement of human clinical trials. Additionally, upon and after the First
Commercial Sale or distribution of a Royalty Product, and for so long as such Royalty Product is sold by or on behalf of Sponsor or its
Affiliates, Sponsor shall maintain

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

24

comprehensive general liability, product liability and broad form contractual liability insurance in amounts and with coverage conditions
customary for like products naming Buck as an additional insured.

IN WITNESS WHEREOF, the parties hereto have caused their duly authorized representatives to execute this Agreement.

Unity Biotechnology, Inc.

Buck institute for Research on Aging By:

By:/s/ Nathaniel David

Name:Nathaniel David, PhD

Title:President

Date:27 January 2017

By:/s/ Remy Gross, III

Name:Remy Gross, III

Title:Vice President, Business Development

Date:

25

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
Exhibit A

Unity and Buck – Patent Portfolio Summary

[***]

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

26

Exhibit B

CENEXYS, INC.

STOCK PURCHASE AGREEMENT

This Stock Purchase Agreement (the “Agreement”) is made as of February 3, 2014  by  and  between  Cenexys,  Inc.,  a  Delaware

corporation (the “Company”), and The Buck Institute for Research on Aging (the “Purchaser”).

In consideration of the mutual covenants and representations set forth below, the Company and the Purchaser agree as follows:

1.

Purchase and Sale of the Shares. Subject to the terms and conditions of this Agreement, the Company agrees to sell to
the Purchaser and the Purchaser agrees to purchase from the Company on the Closing (as defined below) 390,000 shares of the Company’s
Common  Stock,  par  value  $0.0001  per  share  (the  “Shares”),  at  a  price  of  $0.006  per  share  (the  “Purchase  Price”),  for  aggregate
consideration equal to $2,340.00.

2.

Closing. The purchase and sale of the Shares shall occur at a closing (the “Closing”) to be held on the date first set forth
above, or at any other time mutually agreed upon by the Company and the Purchaser. The Closing will take place at the principal office of
the  Company  or  at  such  other  place  as  shall  be  designated  by  the  Company.  At  the  Closing,  the  Purchaser  shall  deliver  the  aggregate
Purchase Price set forth above to the Company by wire transfer, check or any other method of payment permissible under applicable law and
approved by the Company’s board of directors (or any combination of such methods of payment), and the Company will issue, as promptly
thereafter as practicable, a stock certificate, registered in the name of the Purchaser, reflecting the Shares.

3.

Restrictions on Transfer.

A.

Investment  Representations  and  Legend  Requirements.  The  Purchaser  hereby  makes  the  investment
representations listed on Exhibit A to the Company as of the date of this Agreement and as of the date of the Closing, and agrees that such
representations are incorporated into this Agreement by this reference, such that the Company may rely on them in issuing the Shares. The
Purchaser understands and agrees that the Company shall cause the legends set forth below, or substantially equivalent legends, to be placed
upon  any  certificate(s)  evidencing  ownership  of  the  Shares,  together  with  any  other  legends  that  may  be  required  by  the  Company  or  by
applicable state or federal securities laws:

THE  SECURITIES  REPRESENTED  HEREBY  HAVE  NOT  BEEN  REGISTERED  UNDER  THE
SECURITIES ACT OF 1933 (THE “ACT”) AND MAY NOT BE OFFERED, SOLD OR OTHER WISE
TRANSFERRED, PLEDGED OR HYPOTHECATED UNLESS AND UNTIL REGISTERED UNDER
THE ACT OR, IN THE OPINION OF COUNSEL SATISFACTORY TO THE ISSUER OF THESE 

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

27

 
 
 
 
 
 
 
 
SECURITIES,  SUCH  OFFER,  SALE  OR  TRANSFER,  PLEDGE  OR  HYPOTHECA  TION
OTHERWISE COMPLIES WITH THE ACT.

THE  SHARES  REPRESENTED  BY  THIS  CERTIFICATE  ARE  SUBJECT  TO  CERTAIN
RESTRICTIONS  ON  TRANSFER,  A  RIGHT  OF  FIRST  REFUSAL,  A  LOCK-UP  PERIOD  IN  THE
EVENT  OF  A  PUBLIC  OFFERING  AND  A  REPURCHASE  OPTION  HELD  BY  THE  ISSUER  OR
ITS  ASSIGNEE(S)  AS  SET  FORTH  IN  THE  STOCK  PURCHASE  AGREEMENT  BETWEEN  THE
ISSUER  AND  THE  ORIGINAL  HOLDER  OF  THESE  SHARES,  A  COPY  OF  WHICH  MAY  BE
OBTAINED  AT  THE  PRINCIPAL  OFFICE  OF  THE  ISSUER.  SUCH  TRANSFER  RESTRICTIONS,
RIGHT OF FIRST REFUSAL, LOCK-UP PERIOD AND REPURCHASE OPTION ARE BINDING ON
TRANSFEREES OF THESE SHARES.

Stop-Transfer  Notices.  The  Purchaser  agrees  that  to  ensure  compliance  with  the  restrictions  referred  to
herein, the Company may issue appropriate “stop transfer” instructions to its transfer agent, if any, and that, if the Company transfers its own
securities, it may make appropriate notations to the same effect in its own records.

B.

Refusal to Transfer. The Company shall not be required (i) to transfer on its books any Shares that have been
sold or otherwise transferred in violation of any of the provisions of this Agreement or (ii) to treat as owner of such Shares or to accord the
right to vote or pay dividends to any purchaser or other transferee to whom such Shares shall have been so transferred.

C.

D.

Lock-Up Period. The Purchaser hereby agrees that the Purchaser shall not sell, offer, pledge, contract to sell,
grant any option or contract to purchase, purchase any option or contract to sell, grant any right or warrant to purchase, lend or otherwise
transfer  or  encumber,  directly  or  indirectly,  any  Shares  or  other  securities  of  the  Company,  nor  shall  the  Purchaser  enter  into  any  swap,
hedging or other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of any Shares or
other securities of the Company, during the period from the filing of the first registration statement of the Company filed under the Securities
Act of 1933, as amended (the “Securities Act”), that includes securities to be sold on behalf of the Company to the public in an underwritten
public offering under the Securities Act through the end of the 180-day period following the effective date of such registration statement (or
such other period as may be requested by the Company or the underwriters to accommodate regulatory restrictions on (i) the publication or
other distribution of research reports and (ii) analyst recommendations and opinions, including, but not limited to, the restrictions contained
in NASD Rule 271l(f)(4) or NYSE Rule 472(f)(4), or any successor provisions or amendments thereto). The Purchaser further agrees, if so
requested by the Company or any representative of its underwriters, to enter into such underwriter’s standard form of “lockup” or “market
standoff” agreement in a form satisfactory to the Company and such underwriter. The Company may impose stop-transfer instructions with
respect to securities subject to the foregoing restrictions until the end of any such restriction period.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

28

 
 
 
 
E.

Shares. No Shares purchased pursuant to this Agreement, nor any beneficial interest in such Shares, shall be
sold,  transferred,  encumbered  or  otherwise  disposed  of  in  any  way  (whether  by  operation  of  law  or  otherwise)  by  the  Purchaser  or  any
subsequent  transferee,  other  than  in  compliance  with  the  Company’s  right  of  first  refusal  provisions  contained  in  Section  4  of  this
Agreement.

4.

Company’s Right of First Refusal. Before any Shares acquired by the Purchaser pursuant to this Agreement (or any
beneficial interest in such Shares) may be sold, transferred, encumbered or otherwise disposed of in any way (whether by operation of law or
otherwise) by the Purchaser or any subsequent transferee ( each a “Holder”), such Holder must first offer such Shares or beneficial interest to
the Company and/or its assignee(s) as follows:

A.

Notice  of  Proposed  Transfer.  The  Holder  shall  deliver  to  the  Company  a  written  notice  stating:  (i)  the
Holder’s bona fide intention to sell or otherwise transfer the Shares; (ii) the name of each proposed transferee; (iii) the number of Shares to
be transferred to each proposed transferee; (iv) the bona fide cash price or other consideration for which the Holder proposes to transfer the
Shares; and (v) that by delivering the notice, the Holder offers all such Shares to the Company and/or its assignee(s) pursuant to this section
and on the same terms described in the notice.

Exercise  of  Right  of  First  Refusal.  At  any  time  within  30  days  after  receipt  of  the  Holder’s  notice,  the
Company and/or its assignee(s) may, by giving written notice to the Holder, elect to purchase all, but not less than all, of the Shares proposed
to be transferred to any one or more of the proposed transferees, at the purchase price determined in accordance with Section 4.C.

B.

Purchase Price. The purchase price for the Shares purchased by the Company and/or its assignee(s) under
this section shall be the price listed in the Holder’s notice. If the price listed in the Holder’s notice includes consideration other than cash, the
cash equivalent value of the non-cash consideration shall be determined by the board of directors of the Company in its sole discretion.

C.

D.

Payment. Payment of the purchase price shall be made, at the option of the Company and/or its assignee(s),
in cash (by check), by cancellation of all or a portion of any outstanding indebtedness of the Holder to the Company and/or its assignee(s), or
by any combination thereof within 30 days after receipt by the Company of the Holder’s notice (or at such later date as is called for by such
notice).

E.

Holder’s Right to Transfer. If all of the Shares proposed in the notice to be transferred to a given proposed
transferee are not purchased by the Company and/or its assignee(s) as provided in this section, then the Holder may sell or otherwise transfer
such Shares to that proposed transferee; provided that: (i) the transfer is made only on the terms provided for in the notice, with the exception
of the purchase price, which may be either the price listed in the notice or any higher price; (ii) such transfer is consummated within 60 days
after the date the notice is delivered to the Company; (iii) the transfer is effected in accordance with any applicable securities laws, and if
requested by the Company, the Holder shall have delivered an opinion of counsel

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

29

 
 
 
 
 
 
acceptable  to  the  Company  to  that  effect;  and  (iv)  the  proposed  transferee  agrees  in  writing  to  receive  and  hold  the  Shares  so  transferred
subject  to  all  of  the  provisions  of  this  Agreement, including  but  not  limited  to  this  section,  and  there  shall  be  no  further  transfer  of  such
Shares except in accordance with the terms of this section. If any Shares described in a notice are not transferred to the proposed transferee
within  the  period  provided  above,  then  before  any  such  Shares  may  be  transferred,  a  new  notice  shall  be  given  to  the  Company, and  the
Company and/or its assignees shall again be offered the right of first refusal described in this section.

F.

Involuntary Transfers. Subject to the other provisions of this Section 4, in the event, at any time after the date
of this Agreement, of any transfer by operation of law or other involuntary transfer (including, but not limited to, transfers by operation of
law or other involuntary transfers in connection with a divorce, dissolution, legal separation or annulment) of all or a portion of the Shares by
the record holder thereof that does not occur in accordance with the other provisions of this Section 4, the Company shall have the right to
purchase all of the Shares transferred at the greater of the purchase price paid by Purchaser pursuant to this Agreement or the fair market
value  of  the  Shares  on  the  date  of  transfer  (as  determined  by  the  board  of  directors  of  the  Company).  Upon  such  a  transfer,  the  persons
transferring or acquiring the Shares shall promptly notify the Secretary of the Company in writing of such transfer. The right to purchase
such Shares shall be provided to the Company for a period of 30 days following receipt by the Company of written notice of the transfer.

G.

Exception  for  Certain  Affiliates.  Notwithstanding  anything  to  the  contrary  contained  elsewhere  in  this
section,  the  transfer  of  any  or  all  of  the  Shares  to  an  affiliated  research  organization  shall  be  exempt  from  the  provisions  of  this  section;
provided that, in each such case, the transferee agrees in writing to receive and hold the Shares so transferred subject to all of the provisions
of this Agreement, including but not limited to this section, and there shall be no further transfer of such Shares except in accordance with
the terms of this section; and provided further, that without the prior written consent of the Company, which may be withheld in the sole
discretion of the Company, no more than three transfers may be made pursuant to this section, including all transfers by the Holder and all
transfers by any transferee.

H.

Termination of Right of First Refusal. The rights contained in this section shall terminate as to all Shares
purchased hereunder upon the earlier of: (i) the closing date of the first sale of Common Stock of the Company to the general public pursuant
to a registration statement filed with and declared effective by the Securities and Exchange Commission under the Securities Act, and (ii) the
closing date of a Change of Control pursuant to which the holders of the outstanding voting securities of the Company receive securities of a
class registered pursuant to Section 12 of the Securities Exchange Act of 1934, as amended.

5.

Tax  Consequences.  The  Purchaser  has  reviewed  with  the  Purchaser’s  own  tax  advisors  the  federal,  state,  local  and
foreign tax consequences of this investment and the transactions contemplated by this Agreement. The Purchaser is relying solely on such
advisors and not on any statements or representations of the Company or any of its agents. The Purchaser understands that

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

30

 
 
 
 
 
 
the Purchaser (and not the Company) shall be responsible for any tax liability that may arise as a result of the transactions contemplated by
this Agreement.

6.

General Provisions.

rules, of California.

A.

Choice of Law. This Agreement shall be governed by the internal substantive laws, but not the choice of law

B.

Integration.  This  Agreement,  including  all  exhibits  hereto,  represents  the  entire  agreement  between  the
parties with respect to the purchase of the Shares by the Purchaser and supersedes and replaces any and all prior written or oral agreements
regarding  the  subject  matter  of  this  Agreement  including,  but  not  limited  to,  any  representations  made  during  any  interviews,  relocation
discussions or negotiations whether written or oral.

C.

Notices.  Any  notice,  demand,  offer,  request  or  other  communication  required  or  permitted  to  be  given  by
either the Company or the Purchaser pursuant to the terms of this Agreement shall be in writing and shall be deemed effectively given the
earlier  of  (i)  when  received,  (ii)  when  delivered  personally,  (iii)  one  business  day  after  being  delivered  by  facsimile  (with  receipt  of
appropriate confirmation), (iv) one business day after being deposited with an overnight courier service or (v) four days after being deposited
in the U.S. mail, First Class with postage prepaid and return receipt requested, and addressed to the parties at the addresses provided to the
Company (which the Company agrees to disclose to the other parties upon request) or such other address as a party may request by notifying
the other in writing.

D.

Successors.  Any  successor  to  the  Company  (whether  direct  or  indirect  and  whether  by  purchase,  merger,
consolidation, liquidation or otherwise) to all or substantially all of the Company’s business and/or assets shall assume the obligations under
this  Agreement  and  agree  expressly  to  perform  the  obligations  under  this  Agreement  in  the  same  manner  and  to  the  same  extent  as  the
Company would be required to perform such obligations in the absence of a succession. For all purposes under this Agreement, the term
“Company”  shall  include  any  successor  to  the  Company’s  business  and/or  assets  which  executes  and  delivers  the  assumption  agreement
described in this section or which becomes bound by the terms of this Agreement by operation of law. Subject to the restrictions on transfer
set forth in this Agreement, this Agreement shall be binding upon the Purchaser and his or her heirs, executors, administrators,  successors
and assigns.

E.

Assignment; Transfers. Except as set forth in this Agreement, this Agreement, and any and all rights, duties
and obligations hereunder, shall not be assigned, transferred, delegated or sublicensed by the Purchaser without the prior written consent of
the Company. Any attempt by the Purchaser without such consent to assign, transfer, delegate or sublicense any rights, duties or obligations
that arise under this Agreement shall be void. Except as set forth in this Agreement, any transfers in violation of any restriction upon transfer
contained in any section of this Agreement shall be void, unless such restriction is waived in accordance with the terms of this Agreement.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

31

 
 
 
 
 
 
 
 
Waiver. Either party’s failure to enforce any provision of this Agreement shall not in any way be construed as
a waiver of any such provision, nor prevent that party from thereafter enforcing any other provision of this Agreement. The rights granted
both parties hereunder are cumulative and shall not constitute a waiver of either party’s right to assert any other legal remedy available to it.

F.

Purchaser  Investment  Representations  and  Further  Documents.  The  Purchaser  agrees  upon  request  to
execute any further documents or instruments necessary or reasonably desirable in the view of the Company to carry out the purposes or
intent of this Agreement, including (but not limited to) the applicable exhibits and attachments to this Agreement.

G.

provisions shall nevertheless remain effective and shall remain enforceable to the greatest extent permitted by law.

H.

Severability.  Should  any  provision  of  this  Agreement  be  found  to  be  illegal  or  unenforceable,  the  other

I.

Rights as Stockholder. Subject to the terms and conditions of this Agreement, the Purchaser shall have all of
the rights of a stockholder of the Company with respect to the Shares from and after the date that the Purchaser delivers a fully executed
copy  of  this  Agreement  (including  the  applicable  exhibits  and  attachments  to  this  Agreement)  and  full  payment  for  the  Shares  to  the
Company, and until such time as the Purchaser disposes of the Shares in accordance with this Agreement. Upon such transfer, the Purchaser
shall  have  no  further  rights  as  a  holder  of  the  Shares  so  purchased  except  (in  the  case  of  a  transfer  to  the  Company)  the  right  to  receive
payment  for  the  Shares  so  purchased  in  accordance  with  the  provisions  of  this  Agreement,  and  the  Purchaser  shall  forthwith  cause  the
certificate(s) evidencing the Shares so purchased to be surrendered to the Company for transfer or cancellation.

Adjustment for Stock Split. All references to the number of Shares and the purchase price of the Shares in this
Agreement shall be adjusted to reflect any stock split, stock dividend or other change in the Shares which may be made after the date of this
Agreement.

J.

K.

Arbitration and Equitable Relief.

(1)

Arbitration.  IN  CONSIDERATION  OF  THE  PROMISES  IN  THIS  AGREEMENT,  THE
PURCHASER  AGREES  THAT  ANY  AND  ALL  CONTROVERSIES,  CLAIMS,  OR  DISPUTES  WITH  ANYONE  (INCLUDING  THE
COMPANY  AND  ANY  EMPLOYEE,  OFFICER,  DIRECTOR,  SHAREHOLDER  OR  BENEFIT  PLAN  OF  THE  COMPANY  IN  THEIR
CAPACITY  AS  SUCH  OR  OTHERWISE)  ARISING  OUT  OF,  RELATING  TO,  OR  RESULTING  FROM  THIS  AGREEMENT,  SHALL  BE
SUBJECT  TO  BINDING  ARBITRATION  UNDER  THE  ARBITRATION  RULES  SET  FORTH  IN  CALIFORNIA  CODE  OF  CIVIL
PROCEDURE SECTION 1280 THROUGH 1294.2, INCLUDING SECTION 1283.05 (THE “RULES”) AND  PURSUANT  TO  CALIFORNIA
LAW. DISPUTES WHICH THE PURCHASER AGREES TO ARBITRATE, AND THEREBY AGREES TO WAIVE ANY RIGHT TO A TRIAL
BY JURY, INCLUDE ANY STATUTORY CLAIMS UNDER STATE OR FEDERAL LAW, INCLUDING, BUT NOT LIMITED TO, CLAIMS
UNDER TITLE VII OF THE CIVIL RIGHTS ACT OF 1964, THE AMERICANS WITH DISABILITIES 

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

32

 
 
 
 
 
 
ACT OF 1990, THE AGE DISCRIMINATION IN EMPLOYMENT ACT OF 1967, THE OLDER WORKERS BENEFIT PROTECTION ACT,
THE WORKER ADJUSTMENT AND RETRAINING NOTIFICATION ACT, THE CALIFORNIA FAIR EMPLOYMENT AND HOUSING
ACT, THE FAMILY AND MEDICAL LEAVE ACT, THE CALIFORNIA FAMILY RIGHTS ACT, THE CALIFORNIA LABOR CODE,
CLAIMS OF HARASSMENT, DISCRIMINATION OR WRONGFUL TERMINATION AND ANY STATUTORY CLAIMS. THE PURCHASER
FURTHER UNDERSTANDS THAT THIS AGREEMENT TO ARBITRATE ALSO APPLIES TO ANY DISPUTES THAT THE COMPANY
MAY HAVE WITH THE PURCHASER.

(2)

Procedure.  THE  PURCHASER  AGREES  THAT  ANY  ARBITRATION  WILL  BE
ADMINISTERED BY THE AMERICAN ARBITRATION ASSOCIATION (“AAA”) AND THAT THE NEUTRAL ARBITRATOR WILL
BE  SELECTED  IN  A  MANNER  CONSISTENT  WITH  ITS  NATIONAL  RULES  FOR  THE  RESOLUTION  OF  EMPLOYMENT
DISPUTES.  THE  PURCHASER  AGREES  THAT  THE  ARBITRATOR  SHALL  HAVE  THE  POWER  TO  DECIDE  ANY  MOTIONS
BROUGHT  BY  ANY  PARTY  TO  THE  ARBITRATION,  INCLUDING  MOTIONS  FOR  SUMMARY  JUDGMENT  AND/OR
ADJUDICATION  AND  MOTIONS  TO  DISMISS  AND  DEMURRERS,  PRIOR  TO  ANY  ARBITRATION  HEARING.  THE
PURCHASER ALSO AGREES THAT THE ARBITRATOR SHALL HAVE THE POWER TO AWARD ANY REMEDIES, INCLUDING
ATTORNEYS’  FEES  AND  COSTS,  AVAILABLE  UNDER  APPLICABLE  LAW.  PURCHASER  UNDERSTANDS  THAT  THE
COMPANY WILL PAY FOR ANY ADMINISTRATIVE OR HEARING FEES CHARGED BY THE ARBITRATOR OR AAA EXCEPT
THAT  PURCHASER  SHALL  PAY  THE  FIRST  $125.00  OF  ANY  FILING  FEES  ASSOCIATED  WITH  ANY  ARBITRATION
PURCHASER  INITIATES.  PURCHASER  AGREES  THAT  THE  ARBITRATOR  SHALL  ADMINISTER  AND  CONDUCT  ANY
ARBITRATION  IN  A  MANNER  CONSISTENT  WITH  THE  RULES  AND  THAT  TO  THE  EXTENT  THAT  THE  AAA’S  NATIONAL
RULES  FOR  THE  RESOLUTION  OF  EMPLOYMENT  DISPUTES  CONFLICT  WITH  THE  RULES,  THE  RULES  SHALL  TAKE
PRECEDENCE. THE PURCHASER AGREES THAT THE DECISION OF THE ARBITRATOR SHALL BE IN WRITING.

(3)

Remedy.  EXCEPT  AS  PROVIDED  BY  THE  RULES  AND  THIS  AGREEMENT,
ARBITRATION  SHALL  BE  THE  SOLE,  EXCLUSIVE  AND  FINAL  REMEDY  FOR  ANY  DISPUTE  BETWEEN  THE  PURCHASER
AND THE COMPANY. ACCORDINGLY, EXCEPT AS PROVIDED FOR BY THE RULES AND THIS AGREEMENT, NEITHER THE
PURCHASER  NOR  THE  COMPANY  WILL  BE  PERMITTED  TO  PURSUE  COURT  ACTION  REGARDING  CLAIMS  THAT  ARE
SUBJECT TO ARBITRATION. NOTWITHSTANDING, THE ARBITRATOR WILL NOT HAVE THE AUTHORITY TO DISREGARD
OR REFUSE TO ENFORCE ANY LAWFUL COMPANY POLICY, AND THE ARBITRATOR SHALL NOT ORDER OR REQUIRE THE
COMPANY TO ADOPT A POLICY NOT OTHERWISE REQUIRED BYLAW WHICH THE COMPANY HAS NOT ADOPTED.

THE PURCHASER IS EXECUTING THIS

(4)

Voluntary Nature of Agreement. THE PURCHASER ACKNOWLEDGES AND AGREES THAT

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

33

 
 
 
AGREEMENT VOLUNTARILY AND WITHOUT ANY DURESS OR UNDUE INFLUENCE BY THE COMPANY OR ANYONE ELSE.
THE  PURCHASER  FURTHER  ACKNOWLEDGES  AND  AGREES  THAT  THE  PURCHASER  HAS  CAREFULLY  READ  THIS
AGREEMENT  AND  THAT  THE  PURCHASER  HAS  ASKED  ANY  QUESTIONS  NEEDED  FOR  THE  PURCHASER  TO
UNDERSTAND  THE  TERMS,  CONSEQUENCES  AND  BINDING  EFFECT  OF  THIS  AGREEMENT  AND  FULLY  UNDERSTANDS
IT,  INCLUDING  THAT  THE  PURCHASER  IS  WAIVING  THE  PURCHASER’S  RIGHT  TO  A  JURY  TRIAL.  FINALLY,  THE
PURCHASER  AGREES  THAT  THE  PURCHASER  HAS  BEEN  PROVIDED  AN  OPPORTUNITY  TO  SEEK  THE  ADVICE  OF  AN
ATTORNEY OF THE PURCHASER’S CHOICE BEFORE SIGNING THIS AGREEMENT.

L.

Reliance  on  Counsel  and  Advisors.  The  Purchaser  acknowledges  that  Wilson  Sonsini  Goodrich  &  Rosati,
Professional  Corporation,  is  representing  only  the  Company  in  this  transaction.  The  Purchaser  acknowledges  that  he  or  she  has  had  the
opportunity to review this Agreement, including all attachments hereto, and the transactions contemplated by this Agreement with his or her
own legal counsel, tax advisors and other advisors. The Purchaser is relying solely on his or her own counsel and advisors and not on any
statements  or  representations  of  the  Company  or  its  agents  for  legal  or  other  advice  with  respect  to  this  investment  or  the  transactions
contemplated by this Agreement.

Counterparts. This Agreement may be executed in one or more counterparts, each of which will be deemed
an original, but all of which together will constitute one and the same agreement. Facsimile copies of signed signature pages shall be binding
originals.

M.

(signature page follows)

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

34

 
 
 
 
 
The parties represent that they have read this Agreement in its entirety, have had an opportunity to obtain the advice of counsel
prior to executing this Agreement and fully understand this Agreement. The Purchaser agrees to notify the Company of any change in his or
her address below.

THE BUCK INSTITUTE FOR RESEARCH ON AGING

CENEXYS, INC.

/s/ Remy Gross, III
Signature

Remy Gross, III
Print Name

VP, Business Development
Print Title

Address:

8001 Redwood Blvd.

Novato, CA 94945

Signature

Print Name

Print Title

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

35

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The parties represent that they have read this Agreement in its entirety, have had an opportunity to obtain the advice of counsel
prior to executing this Agreement and fully understand this Agreement. The Purchaser agrees to notify the Company of any change in his or
her address below.

THE BUCK INSTITUTE FOR RESEARCH ON AGING

CENEXYS, INC.

Signature

Print Name

Print Title

Address:

/s/ Nathaniel David
Signature

Nathaniel David
Print Name

February 25, 2014
Print Title

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

36

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit C

Proprietary Research Tools and Proprietary Research Tool Patents 

None.

37

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

Exhibit D

MATERIAL TRANSFER AGREEMENT
Buck Institute for Research on Aging

Dr.                                                (Recipient Scientist)
COMPANY NAME
ADDRESS
ADDRESS

DATE

Buck Institute for Research on Aging (“Buck”) is pleased to be able to provide
          INSERT MATERIALS HERE                                                                                     and any components thereof, which we shall refer
to throughout this agreement as the “Material,” to you at COMPANY NAME         (Company). Buck is interested in supporting research
using the Material and will provide you with samples of the Material as long as you agree to certain conditions on your use of the
Material.  The conditions described below are necessary to insure that the Material is used solely for research and that Buck’s interests in any
possible commercialization of the Material are protected.  These conditions are:

1.

2.

3.

4.

The Material is owned by Buck and is provided under a license agreement effective as of ____ (“License”) between the
parties.  Upon termination of your research or use of the Material and/or at the instructions of Buck, you shall either return the
Material to Buck or destroy all unused portions of the Material.

Use of the Material must be in compliance with the terms of the license agreement and applicable laws and regulations.  The
Material must not be used in human subjects, in clinical trials, or for diagnostic purposes involving human subjects, without the
written consent of Buck.

The Material must not be transferred to any other parties, other than researchers at your Company or collaborators that are
working on specific research projects on behalf of the Company (and transferred for the purpose of such collaboration) without
first having obtained a written agreement to the transfer from Buck.  No researchers working with you may use the Material
unless they are aware of and agree to be bound by the terms of this agreement.  Both parties shall comply with all applicable laws
and regulations, as amended from time to time, with respect to the collection, use, storage and disclosure of the Material and any
related data, including without limitation, the Health Insurance Portability and Accountability Act of 1996 (HIPAA) and its
implementing regulations (45 C.F.R. et.seq.)

Except to the extent prohibited by law, Company will assume all liability for damages which may arise from its use, storage or
disposal of the Material.  Buck will not be liable to Company for any loss, claim or demand made by Company or made against
Company by any other party, due to or arising from the use of the Material by Company, except to the extent permitted by law
when caused by the gross negligence or willful misconduct of Buck.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

38

 
 
5.

6.

7.

8.

9.

ANY MATERIAL DELIVERED PURSUANT TO THIS AGREEMENT IS UNDERSTOOD TO BE EXPERIMENTAL IN
NATURE AND MAY HAVE HAZARDOUS PROPERTIES.  ANY MATERIAL PROVIDED IS PROVIDED AS IS AND BUCK
MAKES NO AND HEREBY DISCLAIMS ALL REPRESENTATIONS OR WARRANTIES OF ANY KIND, EITHER
EXPRESSED OR IMPLIED.  THERE ARE NO EXPRESS OR IMPLIED WARRANTIES OF MERCHANTABILITY OR
FITNESS FOR A PARTICULAR PURPOSE, OR THAT THE USE OF THE MATERIAL WILL NOT INFRINGE ANY
PATENT, COPYRIGHT, TRADEMARK OR OTHER PROPRIETARY RIGHTS.

Company agrees to provide appropriate acknowledgement of the source of the Material in all publications.

Company agrees to pay $            in partial reimbursement of the costs of producing, maintaining and distributing the Material.

Company will not use publicly for publicity, promotion, or otherwise, any logo, name, trade name, service mark, or trademark of
Buck or its Affiliates, including, but not limited to the terms “Buck,” “Buck Institute,” and the Buck logo, or any simulation,
abbreviation, or adaptation of the same, or the name of any Buck employee or agent, without Buck’s prior, written, express
consent, other than provided in Section 6 above.  Buck may withhold such consent in Buck’s absolute discretion.

This agreement, in conjunction with the license agreement, constitutes the final, complete and exclusive agreement between the
parties with respect to its subject matter and supercedes all past and contemporaneous agreements, promises, and understandings,
whether oral or written, between the parties.  This agreement shall be binding upon and inure to the benefit of the parties, their
heirs, legal representatives, successors and assigns.  This agreement may not be amended or modified except by a writing signed
by both parties and identified as an amendment to this agreement. Neither this agreement nor any of the rights or obligations
under the agreement may be assigned by Company without the written consent of Buck. The failure of Buck to insist at any time
upon the strict observance or performance of any of the provisions of this agreement, or to exercise any right or remedy as
provided in this agreement, will not impair any such right or remedy and will not be construed to be a waiver or relinquishment of
the right or remedy.  Execution of this agreement can be effected by photocopied, scanned or faxed signatures.

If you agree to these conditions, please sign in the space provided below as the Recipient and have an authorized representative of your
Company sign where indicated.  Return the agreement to Buck Institute for Research on Aging, 8001 Redwood Boulevard, Novato,
California 94945.  Upon receipt of the signed agreement, Buck will provide the Material as requested.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

[SIGNATURES ON THE NEXT PAGE]

39

 
BUCK INSTITUTE ON AGING

By: 

Date: ________________________

[insert name and title of Buck signatory]

READ AND UNDERSTOOD BY THE RECIPIENT SCIENTIST:

(Recipient Scientist Signature)*

(Recipient Scientist)

______________________________

ACCEPTED AND AGREED BY AUTHORIZED REPRESENTATIVE OF RECEIVING COMPANY

By: 

Date: ________________________

(Authorized Representative’s Signature)*

Printed Name and Title: :  ________________________________

Company:  ________________________________

Address: ________________________________

__________________________________________

Phone No.: ________________________________

*Please Note: The Recipient and the Authorized Representative cannot be the same.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

40

 
 
Exhibit 10.21

EXCLUSIVE LICENSE AGREEMENT

BETWEEN

THE JOHNS HOPKINS UNIVERSITY

&

UNITY BIOTECHNOLOGY, INC.

JHU Agreement: A30652

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
THIS  LICENSE  AGREEMENT  (the  “Agreement”)  is  entered  into  by  and  between  THE  JOHNS  HOPKINS  UNIVERSITY,  a
Maryland  corporation  having  an  address  at  3400  N.  Charles  Street,  Baltimore,  Maryland,  21218-2695  (“JHU”)  and  Unity  Biotechnology,
Inc., a Delaware corporation having an address at 3280 Brisbane Blvd, Brisbane CA 94005 (“Company”), with respect to the following:

LICENSE AGREEMENT

RECITALS

WHEREAS, as a center for research and education, JHU is interested in licensing PATENT RIGHTS (hereinafter defined) in a
manner  that  will  benefit  the  public  by  facilitating  the  distribution  of  useful  products  and  the  utilization  of  new  processes,  but  is  without
capacity to commercially develop, manufacture, and distribute any such products or processes; and

WHEREAS, a valuable invention entitled “Improvement of Cartilage Tissue Forming Ability by Clearance of Senescent Cells”
(JHU Ref. # C13890) was developed during the course of research conducted by Drs. Jennifer Elisseeff, Okhee Jeon Chaekyu Kim, and Sona
Rathod (all hereinafter, “Inventors”); and

WHEREAS, JHU has acquired through assignment all rights, title and interest, with the exception of certain retained rights by the

United States Government, in its interest in said valuable inventions; and

WHEREAS,  Company  desires  to  obtain  certain  rights  in  such  inventions  as  herein  provided,  and  to  commercially  develop,

manufacture, use and distribute products and processes based upon or embodying said valuable inventions throughout the world.

NOW THEREFORE, in consideration of the premises and the mutual promises and covenants contained in this Agreement, and

for other good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, the parties hereto agree as follows:

ARTICLE 1

DEFINITIONS

All  references  to  particular  Exhibits,  Articles  or  Paragraphs  shall  mean  the  Exhibits  to,  and  Paragraphs  and  Articles  of,  this
Agreement, unless otherwise specified. For the purposes of this Agreement and the Exhibits hereto, the following words and phrases shall
have the following meanings:

1.1

“AFFILIATED  COMPANY”  as  used  herein  in  either  singular  or  plural  shall  mean  any  corporation,  company,
partnership, joint venture or other entity, which controls, is controlled by or is under common control with Company. For purposes of this
Paragraph 1.1, control shall mean the direct or indirect ownership of at least fifty percent (50%).

1.2

“EFFECTIVE  DATE”  of  this  License  Agreement  shall  mean  the  date  the  last  party  hereto  has  executed  this

Agreement.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

1

 
 
1.3

“EXCLUSIVE  LICENSE”  shall  mean  a  grant  by  JHU  to  Company  of  its  entire  right  and  interest  in  the  PATENT
RIGHTS subject to rights retained by the United States Government, if any, in accordance with the Bayh-Dole Act of 1980 (established by
P.L. 96‑517 and amended by P.L. 98-620, codified at 35 USC § 200 et. seq. and implemented according to 37 CFR Part 401), and subject to
the  retained  right  of  JHU  to  practice  for  its  and  The  Johns  Hopkins  Health  Systems’  non-commercial  academic  research  and  teaching
purposes the PATENT RIGHTS, including the ability to distribute any biological material disclosed and/or claimed in PATENT RIGHTS for
nonprofit non-commercial academic research use to non‑commercial entities as is customary in the scientific community.

1.4

“KNOW-HOW  AND  MATERIALS”  shall  mean  JHU’s  interest  in  proprietary  materials,  information,  records,  and
data developed by Inventors and in the custody and control of JHU that are supplied to the LICENSEE by JHU on or before or after the
EFFECTIVE DATE of this Agreement directly related to the use of and practice of PATENT RIGHTS. Provided, however, that although
JHU may supply additional KNOW HOW AND MATERIALS after the EFFECTIVE DATE, JHU shall have no obligation to do so unless
specifically and clearly stated in this Agreement.

1.5

“LICENSED FIELD” shall mean all fields of use.

1.6

“LICENSED PRODUCT(S)” as used herein in either singular or plural shall mean any material, compositions, drug,
or  other  product,  the  manufacture,  use  or  sale  of  which  by  Company,  AFFILIATED  COMPANIES  and/or  SUBLICENSEES  would
constitute, but for the license granted to Company pursuant to this Agreement, an infringement of a VALID CLAIM of PATENT RIGHTS
(infringement shall include, but is not limited to, direct, contributory, or inducement to infringe).

1.7

“NEOCHONDROGENESIS CLAIM” shall mean a VALID CLAIM of the PATENT RIGHTS that claims a method

for treatment of cartilage defects resulting from osteoarthritis through the administering of a senolytic agent to induce neochondrogenesis.

1.8

“NET SALES”  shall  mean  gross  sales  revenues  and  fees  actually  received  by  Company,  AFFILIATED  COMPANY
and SUBLICENSEES from the sale of ROYALTY PRODUCT(S) less (i) trade, quantity or cash discounts allowed, (ii) refunds, credits or
allowances for returns, rejections and recalls; (iii) rebates and chargebacks, (iv) sales, use or other taxes and tariffs, duties or other charges
levied by a governmental entity on the production, sale, delivery or use of ROYALTY PRODUCT(S), and (iv) packing, freight, shipping and
insurance charges.

In  the  event  that  Company,  AFFILIATED  COMPANY  or  SUBLICENSEE  sells  a  ROYALTY  PRODUCT  as  part  of  a

combination, then:

(i)

in  the  event  that  Company,  AFFILIATED  COMPANY  or  SUBLICENSEE  sells  in  a  particular  country  during  a
particular year a ROYALTY PRODUCT together with other non‑therapeutic ingredients or substances or as part of a kit, and Company or
AFFILIATED COMPANY also sells such ROYALTY PRODUCT in such country in such year separately the NET SALES for purposes of
royalty payments shall be based on the sales revenues and fees that

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

2

would be received from the separate sale of the same quantity of ROYALTY PRODUCT as is contained in the combination.

(ii)

in  the  event  that  Company,  AFFILIATED  COMPANY  or  SUBLICENSEE  sells,  in  a  particular  country  during  a
particular  year,  a  ROYALTY  PRODUCT  for  therapeutic  purposes  in  combination  with  a  therapeutically  active  ingredient  which  is  not  a
LICENSED PRODUCT (“Other Items”), the NET SALES for purposes of royalty payments shall be calculated as follows:

If all ROYALTY PRODUCTS and Other Items contained in the combination are available separately in the
(a)
particular  country  during  such  year,  the  NET  SALES  for  purposes  of  royalty  payments  will  be  calculated  by
multiplying the NET SALES of the combination by the fraction A/A+B, where A is the separately available price of all
ROYALTY  PRODUCTS  in  the  combination  in  the  particular  country  during  such  year,  and  B  is  the  separately
available price for all Other Items in the combination in the particular country during such year.

(b)
If  a  ROYALTY  PRODUCT  or  Other  Item  contained  in  the  combination  is  not  sold  separately  in  the
particular country during such year, the parties agree to negotiate a reduction in the royalty rate to reflect the fair value
that the ROYALTY PRODUCT attributed to the overall product sold.

The term “Other Items” does not include solvents, diluents, carriers, excipients, buffers or the like used in formulating
a product.

(c)
PRODUCT.

In  no  event  shall  Company  apply  the  credit  in  both  paragraphs  above  to  the  same  sale  of  a  LICENSED

In the event that Company enters into a sublicense agreement hereunder, and receives payments based upon the SUBLICENSEE’s sales of
ROYALTY PRODUCTS, Company may upon consent of JHU, which consent shall not be unreasonably withheld, substitute the definition of
“net sales” used in said sublicense agreement by the SUBLICENSEE to calculate payments to Company in place of the foregoing definition
of “NET SALES” for purposes of calculating royalties payable to JHU on such SUBLICENSEE’s sales under such sublicense agreement.
For clarity, JHU shall be entitled to withhold its consent to any proposed alteration to the definition of “net sales” that would materially alter
the royalty payments due to JHU on the applicable SUBLICENSEE’s sales of ROYALTY PRODUCTS.

1.9

“PARTNERSHIP PROCEEDS” shall mean consideration received by Company to the extent attributable to a grant of
a sublicense under the PATENT RIGHTS with respect to a ROYALTY PRODUCT, including licensing fees, equity investments above fair
market  value,  and  any  other  sublicensing  revenue  received  by  Company  to  the  extent  attributable  to  a  grant  of  a  sublicense  under  the
PATENT RIGHTS with respect to a ROYALTY PRODUCT, but specifically excluding consideration received: (i) as royalties for sales of
products, (ii) payments for the occurrence of specified development, regulatory or commercialization milestones, (iii) for the performance of
or reimbursement for research or activities performed by or on behalf of Company, (iv) for the sale of capital stock or other equity interests
in Company, (v) as reimbursement for costs incurred by Company (e.g., patent costs), (vi) for grants of rights to technology other than

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

3

PATENT RIGHTS, (vii) for the supply of ROYALTY PRODUCTS, or other products, materials to such SUBLICENSEE, and (viii) for the
sale of substantially all of the business or assets of Company, whether by merger, sale of stock, sale of assets or otherwise.

1.10

“PATENT RIGHTS”  shall  mean  the  patent  application  listed  in  EXHIBIT  D  together  with  any  subsequently  filed
patent applications owned by JHU that claim inventions made in the laboratory of Inventor, Dr. Jennifer Elisseeff, prior to the Effective Date,
which inventions arose from the use of funds provided by Company and pertain to the mechanisms by which senescent cells give rise to
aging and/or disease, and all continuations, divisions, continuations-in- part and continued prosecution applications with respect to any of the
foregoing,  all  patents  issuing  from  such  patent  applications,  and  all  reissues,  renewals,  reexaminations,  extensions  and  supplemental
protection certificates thereof, and any corresponding foreign patent applications, and any patents, or other equivalent foreign patent rights
issuing, granted or registered thereon.

1.11

“ROYALTY  PRODUCT”  shall  mean  a  LICENSED  PRODUCT  sold  for  treatment  of  osteoarthritis  pursuant  to  a

marketing approval from the FDA, European Medicines Agency or comparable foreign regulatory authority.

1.12

“ROYALTY TERM” shall mean with respect to a particular ROYALTY PRODUCT, the period commencing on the
first  commercial  sale  of  such  ROYALTY  PRODUCT  and  continuing  on  a  country-by-country  basis,  until  the  earlier  of  (i)  such  time  as
neither  the  manufacture,  sale  nor  use  of  such  ROYALTY  PRODUCT  would  infringe  a  VALID  CLAIM  in  the  country  in  which  such
ROYALTY  PRODUCT  is  sold,  and  (ii)  such  time  as  there  is  no  U.S.  or  EP  patent  within  the  PATENT  RIGHTS  containing  a
NEOCHONDROGENESIS CLAIM.

1.13

“SUBLICENSEE(S)”  as  used  herein  in  either  singular  or  plural  shall  mean  any  person  or  entity  other  than  an

AFFILIATED COMPANY to which Company or an AFFILIATED COMPANY has granted a sublicense under this Agreement.

1.14

“VALID  CLAIM”  shall  mean  either:  (a)  a  claim  of  an  issued  and  unexpired  patent  included  within  the  PATENT
RIGHTS which has not been revoked or held unenforceable, unpatentable or invalid by a decision of a court or other governmental agency of
competent  jurisdiction,  unappealable  or  unappealed  within  the  time  allowed  for  appeal,  and  which  has  not  been  disclaimed,  denied  or
admitted  to  be  invalid  or  unenforceable  through  reexamination,  reissue,  disclaimer  or  otherwise;  or  (b)  a  claim  of  a  pending  patent
application  included  within  the  PATENT  RIGHTS,  which  claim  has  not  been  abandoned  or  finally  disallowed  without  the  possibility  of
appeal or refiling of such application, and has been pending for less than five (5) years from the date such claim takes priority, unless and so
long as the claim is still being pursued with reasonable diligence, in which case less than seven (7) years; in each case to the extent such
pending  claim  has  not  been  (i)  canceled,  (ii)  withdrawn  from  consideration,  (iii)  finally  determined  to  be  unallowable  by  the  applicable
governmental authority (and from which no appeal is or can be taken), or (iv) abandoned. Determination of whether a claim of any patent
within the PATENT RIGHTS is a VALID CLAIM shall be made on a country-by-country or jurisdiction-by- jurisdiction basis and shall be
based  solely  on  the  decisions  of  the  patent  office  and/or  the  courts  having  jurisdiction  within  that  particular  country  or  jurisdiction.  For
purposes  of  this  Agreement,  any  decision  adverse  to  the  PATENT  RIGHTS  in  a  particular  country  or  jurisdiction  shall  not  affect  said
PATENT RIGHTS in any other country or jurisdiction.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

4

ARTICLE 2
LICENSE GRANT

Grant. Subject to the terms and conditions of this Agreement, JHU hereby grants to Company

2.1
(i)  a  world-wide  EXCLUSIVE  LICENSE  to  research,  have  researched,  develop,  have  developed,  make,  have  made,  use,  have
used, import, have imported, offer for sale, have offered for sale, sell and have sold the LICENSED PRODUCT(S) in the United States and
worldwide under the PATENT RIGHTS in the LICENSED FIELD, and

(ii) a world-wide nonexclusive license to use the KNOW HOW AND MATERIALS in the LICENSED FIELD.

This  Grant  shall  apply  to  the  Company  and  any  AFFILIATED  COMPANY.  If  any  AFFILIATED  COMPANY  exercises  rights
under  this  Agreement,  such  AFFILIATED  COMPANY  shall  be  bound  by  all  terms  and  conditions  of  this  Agreement,  including  but  not
limited to indemnity and insurance provisions and royalty payments, which shall apply to the exercise of the rights, to the same extent as
would apply had this Agreement been directly between JHU and the AFFILIATED COMPANY. In addition, Company shall remain fully
liable to JHU for all acts and obligations of AFFILIATED COMPANY such that acts of the AFFILIATED COMPANY shall be considered
acts  of  the  Company.  KNOW  HOW  AND  MATERIALS  may  be  transferred  by  JHU  to  Company  from  time-to-time,  provided  that  it  is
understood that JHU shall not be obligated to make any such transfers.

2.2

Sublicense.  Company  may  grant  and  authorize  sublicenses  through  multiple  tiers  under  the  licenses  granted  to  it
pursuant to Paragraph 2.1, subject to the terms and conditions of this Paragraph 2.2. As a condition to its validity and enforceability, each
sublicense agreement shall: (a) reference and give recognition to this Agreement, (b) be consistent with the terms, conditions and limitations
of this Agreement, (c) name JHU as an intended third party beneficiary of the obligations of SUBLICENSEE with respect to provisions to be
included  in  the  sublicense  agreement  for  JHU’s  benefit  in  accordance  with  subsection  (d)  below,  in  each  case  without  imposition  of
obligation  or  liability  on  the  part  of  JHU  or  its  Inventors  to  the  SUBLICENSEE,  and  (d)  specifically  incorporate  Paragraphs  6.2
“Representations by JHU”, 7.1 “Indemnification”, 10.1 “Use of Name”, 10.4 “Product Liability” into the body of the sublicense agreement,
and cause the terms used in therein to have the same meaning as in this Agreement, provided that notwithstanding the terms of Paragraph
10.4, SUBLICENSEE, if it is an organization with a market capitalization in excess of [***] US Dollars (USD$[***]), may self insure so
long  as  SUBLICENSEE  represents  and  warrants  that  it  is  self  insured  for  potential  amounts  payable  pursuant  to  obligations  under  this
Agreement, shall have the right to self-insure to the extent consistent with its normal business practices. Company shall provide to JHU a
copy  of  each  fully  executed  sublicense  agreement,  within  thirty  (30)  days  of  execution  by  both  Company  and  proposed  SUBLICENSEE,
provided  that  Company  may  redact  from  such  copy  any  confidential  terms  that  are  not  necessary  to  determine  compliance  with  this
Agreement. To the extent that any terms, conditions or limitations of any sublicense agreement are inconsistent with this Agreement, those
terms, conditions and limitations are null and void against JHU.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

5

2.3

Government Rights. The United States Government may have acquired a nonexclusive, nontransferable, irrevocable,
paid-up license to practice or have practiced for or on behalf of the United States the inventions described in PATENT RIGHTS throughout
the world. To the extent that the inventions claimed in the PATENT RIGHTS were funded by grants, awards or contracts with the United
States government, the rights granted herein are additionally subject to: (i) the requirement that any LICENSED PRODUCT(S) produced for
use  or  sale  within  the  United  States  shall  be  substantially  manufactured  in  the  United  States  (unless  a  waiver  under  35  USC  §  204  or
equivalent is granted by the appropriate United States government agency), (ii) the right of the United States government to require JHU, or
its licensees, including Company, to grant sublicenses to responsible applicants on reasonable terms when necessary to fulfill health or safety
needs, and, (iii) other rights acquired by the United States government under the laws and regulations applicable to the grant/contract award
under which the inventions were made.

ARTICLE 3

FEES, ROYALTIES & PAYMENTS

3.1

Minimum Annual Royalties. Company shall pay to JHU minimum annual royalties as set forth in Exhibit A.  These
minimum annual royalties shall be due, without invoice from JHU, within sixty (60) days of December 31 of each year, commencing with
December 31, 2020 Running royalties accrued under Paragraph 3.2 and milestones accrued under Paragraph 3.5 and paid to JHU during each
calendar year, commencing with calendar year 2020 shall be credited against the minimum annual royalties due at the end of such calendar
year.

3.2

Running Royalties. Company shall pay to JHU a running royalty in accordance with Exhibit A for each ROYALTY
PRODUCT sold by Company, AFFILIATED COMPANIES and SUBLICENSEES during the ROYALTY TERM. Such payments shall be
made quarterly, as set forth in subsection 5.1(a). All non-US taxes related to LICENSED PRODUCT(S) sold under this Agreement shall be
paid by Company and shall not be deducted from royalty or other payments due to JHU, but shall be deducted from gross sales revenues in
the calculation of NET SALES to the extent such taxes have been included in gross sales revenues and fees. JHU shall be responsible for
paying  any  and  all  taxes  (other  than  withholding  taxes  or  deduction  of  tax  at  source  required  by  applicable  law  to  be  paid  by  Company)
levied on it by account of its receipt of any payments it receives under this Agreement. If applicable laws require that taxes be withheld or
deducted  at  source  from  any  amounts  due  to  JHU  under  this  Agreement,  the  Company  shall  (a)  deduct  these  taxes  from  the  remittable
amount,  (b)  pay  the  taxes  to  the  proper  taxing  authority,  and  (c)  deliver  to  JHU  a  statement  including  the  amount  of  tax  withheld  and
justification  therefor,  and  such  other  information  as  may  be  necessary  for  tax  credit  purposes.  Company  shall  cooperate  with  JHU  in  any
action by JHU for a refund of such taxes withheld.

In  order  to  insure  JHU  the  full  royalty  payments  contemplated  hereunder,  Company  agrees  that  in  the  event  any  ROYALTY
PRODUCT(S) shall be sold by the Company to an AFFILIATED COMPANY, by an AFFILIATED COMPANY to the Company, or among
AFFILIATED COMPANIES the royalties to be paid hereunder for such LICENSED PRODUCT(S) shall be based upon the greater of: 1) the
NET SALES at which the purchaser of ROYALTY PRODUCT(S) resells such product to the end user, or 2) the NET SALES of ROYALTY
PRODUCT(S)  paid  by  the  purchaser  (either  COMPANY  or  AFFILIATED  COMPANY  in  this  case).  Notwithstanding  the  foregoing,  no
royalties shall be payable under this Paragraph 3.2 with

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

6

respect to sales of ROYALTY PRODUCT(S) for use in research and/or development, in clinical trials or as samples.

In the event that consideration in lieu of money is received by Company, an AFFILIATED COMPANY or SUBLICENSEE from
the sale of LICENSED PRODUCT(S), the fair market value of such consideration shall be included in the determination of NET SALES for
such sale. Such fair market value shall be determined by the Company or AFFILIATED COMPANY, as applicable, in good faith.

3.3

Partnership Proceeds. In addition to the running royalty as set forth under Paragraph 3.2, Company shall pay to JHU a
percentage of PARTNERSHIP PROCEEDS as set forth in Exhibit A. This percentage of PARTNERSHIP PROCEEDS shall be due, without
the  need  for  invoice  from  JHU,  within  sixty  (60)  days  after  the  end  of  each  calendar  quarter  in  which  PARTNERSHIP  PROCEEDS  are
received.

3.4

Equity. Within thirty (30) days of achievement of the triggering events described in Exhibit A  and  subject  to  JHU’s
execution and delivery to Company of a Stock Issuance Agreement in substantially the form attached hereto as Exhibit E, Company shall
issue  to  JHU  the  number  of  shares  of  Company  common  stock  as  set  forth  in  Exhibit A  (which  number  of  shares  shall  be  subject  to
adjustment for any stock split, reverse stock split, stock dividend, recapitalization or similar action impacting Company’s capitalization as
further described in the Stock Issuance Agreement).

3.5

Milestones. Company shall pay to JHU the development and sales milestones as set forth in Exhibit A. Development
milestones shall be due, without invoice from JHU, within sixty (60) days of achievement of such milestone. Sales milestones shall be due,
without invoice from JHU, within ninety (90) days following the close of the calendar year in which they are achieved.

3.6

Patent Reimbursement. In the event Company licenses JHU Owned Patent Rights, Company will reimburse JHU for
the costs associated with preparing, filing, maintaining and prosecuting JHU Owned Patent Rights both incurring before the EFFECTIVE
DATE and thereafter for the TERM of this AGREEMENT. Company will reimburse within sixty (60) days of the receipt of invoice from
JHU, for all such costs.

3.7

3.8

Form of Payment. All payments under this Agreement shall be made in U.S. Dollars by either check or wire transfer.

Payment Information. All check payments from Company to JHU shall be sent to:

Director
Johns Hopkins Technology Ventures
The Johns Hopkins University
100 N. Charles Street, 5th Floor
Baltimore, MD 21201
Attn: JHU Agrmt# A30652

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

7

or such other addresses which JHU may designate in writing from time to time. Checks are to be made payable to “The Johns

Hopkins University”. Wire transfers may be made through:

[***]
(JHU Agrmt. #A30652)
Attn: Financial Manager

Company shall be responsible for any and all costs associated with wire transfers.

Via ACH
Johns Hopkins University Central Lockbox
[***]

3.9

Late Payments. In the event that any payment due hereunder is not made when due, the payment shall accrue interest
beginning on the tenth day following the due date thereof, calculated at the annual rate of the sum of (a) two percent (2%) plus (b) the prime
interest  rate  quoted  by  The  Wall  Street  Journal  on  the  date  said  payment  is  due,  the  interest  being  compounded  on  the  last  day  of  each
calendar quarter, provided however, that in no event shall said annual interest rate exceed the maximum legal interest rate for corporations.
Each such payment when made shall be accompanied by all interest so accrued. Said interest and the payment and acceptance thereof shall
not negate or waive the right of JHU to seek any other remedy, legal or equitable, to which it may be entitled because of the delinquency of
any payment including, but not limited to termination of this Agreement as set forth in Paragraph 9.2, subject to the cure provisions set forth
therein.

PATENT PROSECUTION, MAINTENANCE, & INFRINGEMENT

ARTICLE 4

4.1

Prosecution & Maintenance.

(a)

Company  shall  be  responsible,  at  its  expense,  for  filing,  prosecuting  and  maintaining  all  jointly  owned  patents  and
patent  applications  within  the  PATENT  RIGHTS  (“JOINTLY  OWNED  PATENT  RIGHTS”)  using  counsel  of  its  choice.
Company  shall  have  control  over  all  patent  matters  in  connection  with  the  JOINTLY  OWNED  PATENT  RIGHTS,  provided
however, that Company shall (i) cause its patent counsel to timely copy JHU on all correspondence regarding strategy, filing and
prosecution of all patents and patent applications within the JOINTLY OWNED PATENT RIGHTS, between Company’s patent
counsel and any patent office, including without limitation all official actions and written correspondence with any patent office,
and (ii) allow JHU an opportunity to comment and advise Company in advance of any patent filings or major prosecution events.
Notwithstanding  the  foregoing,  if  JHU  disagrees  with  Company  regarding  the  prosecution  strategy  Company  is  pursuing  with
respect to a NEOCHONDROGENESIS CLAIM and the parties are unable to resolve such disagreement despite their using good
faith  efforts  to  do  so,  JHU  shall  have  the  right  to  refer  such  dispute  to  a  mutually  selected  neutral  third  party  for  resolution.
Company shall reasonably consider all comments and advice provided by JHU. If at any time Company determines that it does
not wish to file a patent application in any particular country or to pay the expenses associated with prosecuting or maintaining
any patent application or patent within the JOINTLY OWNED

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

8

PATENT RIGHTS in any particular country, Company shall provide JHU with written notice at least thirty (30) days in
advance of any filing or response deadline, or fee due date. Upon such notification, JHU may file, prosecute, and/or maintain such
patent applications or patent in such country at its own expense. If JHU elects to exercise its back-up rights under the preceding
sentence to file, prosecute or maintain any patent application or patent within JOINTLY OWNED PATENT RIGHTS in a Major
Country,  Company’s  license  with  respect  to  such  patent  applications  or  patent  shall  terminate  in  such  country.  As  used  in  this
subsection  4.1(a),  “Major  Country”  shall  mean  the  United  States,  Canada,  United  Kingdom,  France,  Germany,  Italy,  Spain,
Australia and Japan.

JHU, at Company’s expense, shall file, prosecute and maintain all patents and patent applications within the PATENT
RIGHTS  that  are  solely  owned  by  JHU  (“JHU  OWNED  PATENT  RIGHTS”)  using  counsel  of  JHU’s  choice  reasonably
acceptable to Company and, subject to the terms and conditions of this Agreement, Company shall be licensed thereunder. Title to
all such patents and patent applications shall reside in JHU. JHU shall have control over all patent matters in connection with the
JHU OWNED PATENT RIGHTS, provided however, that JHU shall (i) cause its patent counsel to timely copy Company on all
correspondence  regarding  strategy,  filing  and  prosecution  of  all  patents  and  patent  applications  within  the  PATENT  RIGHTS,
between  JHU’s  patent  counsel  and  JHU  and/or  any  patent  office,  including  without  limitation  all  official  actions  and  written
correspondence  with  any  patent  office,  and  (ii)  allow  Company  an  opportunity  to  comment  and  advise  JHU  in  advance  of  any
patent  filings  or  major  prosecution  events.  JHU  shall  consider  and  reasonably  incorporate  all  comments  and  advice  unless
detrimental to JHU’s intellectual property rights. By concurrent written notification to JHU and its patent counsel at least thirty
(30) days in advance (or later at JHU’s discretion) of any filing or response deadline, or fee due date, Company may elect not to
have a patent application filed in any particular country or not to pay expenses associated with prosecuting or maintaining any
patent application or patent, provided that Company pays for all costs incurred up to JHU’s receipt of such notification. Failure to
provide such notification can be considered by JHU to be Company’s authorization to proceed at Company’s expense. Upon such
notification, JHU may file, prosecute, and/or maintain such patent applications or patent in such country at its own expense and
for its own benefit, and in the event the affected patent applications or patents are in a Major Country, the rights or license granted
hereunder  held  by  Company,  AFFILIATED  COMPANIES  or  SUBLICENSEE(S)  relating  to  such  patent  applications  or  patent
shall terminate in such Major Country.

4.2

Notification. Each party will notify the other promptly in writing when any infringement by another is uncovered or

(b)

suspected.

4.3

Infringement.  Company  shall  have  the  first  right  to  enforce  any  patent  within  PATENT  RIGHTS  against  any
infringement or alleged infringement thereof, and, if such enforcement action is against a COMPETING PRODUCT, shall at all times keep
JHU informed as to the status thereof. Before Company commences an action with respect to any infringement of such patents, Company
shall give careful consideration to the views of JHU and to potential effects on the public interest in making its decision whether or not to
sue. Thereafter, Company may, at its own expense, institute suit against any such infringer or alleged infringer and control and defend such
suit in a manner consistent with the terms and provisions hereof and recover any damages, awards or settlements resulting therefrom, subject
to Paragraph 4.5. If required by law,

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

9

JHU shall permit action under this Paragraph to be brought in its name, including being joined as party-plaintiff. However, no settlement,
consent  judgment  or  other  voluntary  final  disposition  of  the  suit  against  a  COMPETING  PRODUCT  that  concedes  the  invalidity  or
unenforceability of any patent within PATENT RIGHTS may be entered into without the prior written consent of JHU, which consent shall
not be unreasonably withheld. This right to sue for infringement shall not be used in an arbitrary or capricious manner. JHU shall reasonably
cooperate  in  any  such  litigation  at  Company’s  expense.  Company  may  delegate  its  right  to  enforce  the  PATENT  RIGHTS  under  this
Paragraph 4.3 to AFFILIATED COMPANIES or SUBLICENSEES, provided that such AFFILIATED COMPANIES and SUBLICENSEES
agree to comply with the applicable terms of this Paragraph 4.3.

If within ninety (90) days following a request by JHU that Company take action to abate any commercially significant infringement of a
patent  within  the  JHU  OWNED  PATENT  RIGHTS  by  a  COMPETING  PRODUCT,  such  infringing  activity  has  not  been  abated  and  if
Company  has  not  brought  suit  against  the  infringer  or  begun  negotiations  regarding  the  terms  under  which  Company  would  grant  a
sublicense  to  the  infringer,  then  JHU  may,  in  its  sole  judgment  and  at  its  own  expense,  take  steps  to  enforce  any  patent  within  the  JHU
OWNED PATENT RIGHTS against such COMPETING PRODUCT and control, settle, and defend such suit in a manner consistent with the
terms  and  provisions  hereof,  and  recover,  for  its  own  account,  any  damages,  awards  or  settlements  resulting  therefrom.  However,  no
settlement, consent judgment or other voluntary final disposition of the suit that concedes the invalidity or unenforceability of any patent
within  PATENT  RIGHTS  may  be  entered  into  without  the  prior  written  consent  of  Company,  which  consent  shall  not  be  unreasonably
withheld. As used in this Article 4, “COMPETING PRODUCT” means a product for treatment of osteoarthritis sold by a third party without
authorization from Company, the manufacture, use or sale of which would infringe one or more claims of an issued valid patent within the
PATENT RIGHTS.

4.4

Patent  Invalidity  Suit.  If  a  declaratory  judgment  action  is  brought  naming  Company  as  a  defendant  and  alleging
invalidity of any of the JHU OWNED PATENT RIGHTS, JHU may elect to take over the sole defense of the action at its own expense. Each
Party shall cooperate fully with the other in connection with any such action.

4.5

Recovery.  In  the  event  of  a  recovery  by  Company  pursuant  to  any  enforcement  action  brought  by  Company  under
Paragraph 4.3 against a COMPETING PRODUCT, Company shall, to the extent that there is at the time such recovery is obtained a pending
or issued NEOCHONDROGENSIS CLAIM, pay to JHU [***] percent ([***]%) of the recovery, net of all reasonable costs and expenses
associated with each suit or settlement. If the cost and expenses of such action exceed the recovery, then [***] ([***]) of the excess shall be
credited  against  royalties  payable  by  Company  to  JHU  hereunder  in  connection  with  sales  of  ROYALTY  PRODUCTS  covered  in  the
PATENT RIGHTS which are the subject of the infringement suit, in the country of such legal proceedings, provided, however, that any such
credit under this Paragraph shall not exceed [***] percent ([***]%) of the royalties otherwise payable to JHU with regard to sales in the
country of such action in any one calendar year, with any excess credit being carried forward to future calendar years.

4.6

Cooperation.  Each  party  agrees  to  cooperate  in  any  action  under  this  Article  which  is  controlled  by  the  other  party,

provided that the controlling party reimburses the cooperating

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

10

party promptly for any costs and expenses incurred by the cooperating party in connection with providing such assistance.

ARTICLE 5

OBLIGATIONS OF THE PARTIES

5.1

Reports. Company shall provide to JHU the following written reports according to the following schedules.

(a) Company shall provide quarterly Royalty Reports, substantially in the format of Exhibit B and due within sixty (60) days of
the end of each calendar quarter following the first commercial sale of a ROYALTY PRODUCT by Company, an AFFILIATED COMPANY
or  a  SUBLICENSEE(S).  Royalty  Reports  shall  disclose  (i)  the  amount  of  ROYALTY  PRODUCT(S)  sold,  the  total  NET  SALES  of  such
ROYALTY PRODUCT(S) received by Company, AFFILIATED COMPANIES and SUBLICENSEES, and the running royalties due to JHU
as  a  result  of  NET  SALES  by  Company  and  AFFILIATED  COMPANIES  thereof,  and  (ii)  the  amount  of  PARTNERSHIP  PROCEEDS
received  and  the  percentage  thereof  payable  to  JHU  pursuant  to  Paragraph  3.3.  Payment  of  any  such  royalties  and  percentage  of
PARTNERSHIP PROCEEDS due shall accompany such Royalty Reports.

(b) Until Company, an AFFILIATED COMPANY or a SUBLICENSEE(S) has achieved a first commercial sale of a LICENSED
PRODUCT, or received FDA market approval, Company shall provide semiannual Diligence Reports, due within sixty (60) days of the end
of  every  June  and  December  following  the  EFFECTIVE  DATE  of  this  Agreement.  These  Diligence  Reports  shall  describe  Company’s,
AFFILIATED  COMPANIES’  and  any  SUBLICENSEE(S)’s  technical  efforts  towards  meeting  its  obligations  under  the  terms  of  this
Agreement.

(c)  Company  shall  provide  Annual  Reports  within  sixty  (60)  days  of  the  end  of  every  December  following  the  EFFECTIVE

DATE of this Agreement. Annual Reports shall include:

(i)  evidence  of  insurance  as  required  under  Paragraph  10.4,  or,  a  statement  of  why  such  insurance  is  not
currently required, and
(ii) identification of all AFFILIATED COMPANIES which have exercised rights pursuant to Paragraph 2.1,
or, a statement that no AFFILIATED COMPANY has exercised such rights, and
(iii) notice of all FDA approvals of any LICENSED PRODUCT(S) obtained by COMPANY, AFFILIATED
COMPANY or SUBLICENSEE, the patent(s) or patent application(s) licensed under this Agreement upon
which such product is based, and the commercial name of such product, or, in the alternative, a statement
that no FDA approvals have been obtained.

5.2

Records. Company shall make and retain, for a period of three (3) years following the period of each report required by
Paragraph 5.1, true and accurate records, files and books of account containing all the data reasonably required for the full computation and
verification of sales and other information required in Paragraph 5.1. Such books and records shall be in accordance with generally accepted
accounting  principles  consistently  applied.  Company  shall  permit  the  inspection  of  such  records,  files  and  books  of  account  by  an
independent certified public accountant selected by JHU and acceptable to Company in its reasonable judgment during regular

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

11

business hours upon ten (10) business days’ written notice to Company. Such inspection shall not be made more than once each calendar
year. All costs of such inspection shall be paid by JHU, provided that if any such inspection shall reveal that an error in Company’s favor has
been made in the amount of payments hereunder for any calendar year equal to five percent (5%) or more of such payments, such costs shall
be borne by Company.

5.3

Commercially  Reasonable  Efforts.  Company  shall  exercise  commercially  reasonable  efforts  to  develop  and  to
introduce  the  LICENSED  PRODUCT(S)  into  the  commercial  market,  through  itself,  its  AFFILIATED  COMPANIES  and/or  its
SUBLICENSEE(S), consistent with sound and reasonable business practice and judgment.

Following  the  introduction  of  a  LICENSED  PRODUCT  into  the  commercial  market,  and  until  the  expiration  or  termination  of  this
Agreement,  Company  shall  endeavor  to  keep  LICENSED  PRODUCT(S)  reasonably  available  to  the  public  consistent  with  sound  and
reasonable business practice and judgment.

5.4

Patent Acknowledgement. Company agrees that all packaging containing individual LICENSED PRODUCT(S) sold
by Company, AFFILIATED COMPANIES and SUBLICENSEE(S) of Company will be marked with the number of the applicable patent(s)
licensed hereunder in accordance with each country’s patent laws to the extent reasonably practical.

ARTICLE 6

REPRESENTATIONS

6.1

Duties of the Parties.  JHU  is  not  a  commercial  organization.  It  is  an  institute  of  research  and  education.  Therefore,
JHU  has  no  ability  to  evaluate  the  commercial  potential  of  any  PATENT  RIGHTS  or  LICENSED  PRODUCT  or  other  license  or  rights
granted in this Agreement. It is therefore incumbent upon Company to evaluate the rights and products in question, to examine the materials
and information provided by JHU, and to determine for itself the validity of any PATENT RIGHTS, its freedom to operate, and the value of
any LICENSED PRODUCTS or other rights granted.

6.2

Representations  by  JHU.  JHU  warrants  that  (a)  it  has  good  and  marketable  title  to  its  interest  in  the  inventions
claimed under PATENT RIGHTS with the exception of certain retained rights of the United States Government, which may apply if any part
of the JHU research was funded in whole or in part by the United States Government and (b) that Johns Hopkins Technology Ventures has
not  granted  any  rights  or  licenses  that  may  conflict  with  the  rights  and  licenses  granted  herein.  JHU  does  not  warrant  the  validity  of  any
patents or that practice under such patents shall be free of infringement. EXCEPT AS EXPRESSLY SET FORTH IN THIS PARAGRAPH
6.2, (I) COMPANY, AFFILIATED COMPANIES AND SUBLICENSEE(S) AGREE THAT THE PATENT RIGHTS ARE PROVIDED “AS
IS”, AND THAT JHU MAKES NO REPRESENTATION OR WARRANTY WITH RESPECT TO THE PERFORMANCE OF LICENSED
PRODUCT(S)  INCLUDING  THEIR  SAFETY,  EFFECTIVENESS,  OR  COMMERCIAL  VIABILITY,  AND  (II)  JHU  DISCLAIMS  ALL
WARRANTIES WITH REGARD TO PRODUCT(S) LICENSED UNDER THIS AGREEMENT, INCLUDING, BUT NOT LIMITED TO,
ALL WARRANTIES, EXPRESSED OR IMPLIED, OF

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

12

MERCHANTABILITY  AND  FITNESS  FOR  ANY  PARTICULAR  PURPOSE.  NOTWITHSTANDING  ANY  OTHER  PROVISION  OF
THIS  AGREEMENT,  JHU  ADDITIONALLY  DISCLAIMS  ALL  OBLIGATIONS  AND  LIABILITIES  ON  THE  PART  OF  JHU  AND
INVENTORS,  FOR  DAMAGES,  INCLUDING,  BUT  NOT  LIMITED  TO,  DIRECT,  INDIRECT,  SPECIAL,  AND  CONSEQUENTIAL
DAMAGES,  ATTORNEYS’  AND  EXPERTS’  FEES,  AND  COURT  COSTS  (EVEN  IF  JHU  HAS  BEEN  ADVISED  OF  THE
POSSIBILITY  OF  SUCH  DAMAGES,  FEES  OR  COSTS),  ARISING  OUT  OF  OR  IN  CONNECTION  WITH  THE  MANUFACTURE,
USE,  OR  SALE  OF  THE  PRODUCT(S)  LICENSED  UNDER  THIS  AGREEMENT.  COMPANY,  AFFILIATED  COMPANIES  AND
SUBLICENSEE(S)  ASSUME  ALL  RESPONSIBILITY  AND  LIABILITY  FOR  LOSS  OR  DAMAGE  CAUSED  BY  A  PRODUCT
MANUFACTURED,  USED,  OR  SOLD  BY  COMPANY,  ITS  SUBLICENSEE(S)  AND  AFFILIATED  COMPANIES  WHICH  IS  A
LICENSED PRODUCT AS DEFINED IN THIS AGREEMENT.

ARTICLE 7

INDEMNIFICATION

7.1

Indemnification. JHU and the Inventors would have no legal liability exposure to third parties if JHU did not license
the LICENSED PRODUCT(S), and any royalties JHU and the Inventors may receive is not adequate compensation for such legal liability
exposure.  Therefore,  JHU  requires  Company  to  protect  JHU  and  Inventors  from  such  exposure  to  the  same  manner  and  extent  to  which
insurance,  if  available,  would  protect  JHU  and  Inventors.  Furthermore,  JHU  and  the  Inventors  will  not,  under  the  provisions  of  this
Agreement or otherwise, have control over the manner in which Company or its AFFILIATED COMPANIES or its SUBLICENSEE(S) or
those  operating  for  its  account  or  third  parties  who  purchase  LICENSED  PRODUCT(S)  from  any  of  the  foregoing  entities,  develop,
manufacture,  market  or  practice  the  inventions  of  LICENSED  PRODUCT(S).  Therefore,  Company,  AFFILIATED  COMPANY  and
SUBLICENSEE, each solely with respect to its own practice of such Inventions, shall indemnify, defend with counsel reasonably acceptable
to  JHU,  and  hold  JHU,  The  Johns  Hopkins  Health  Systems,  their  present  and  former  trustees,  officers,  Inventors  of  PATENT  RIGHTS,
agents, faculty, employees and students harmless as against any judgments, fees, expenses, or other costs arising from or incidental to any
product  liability  or  other  lawsuit,  claim,  demand  or  other  action  brought  by  a  third  party  as  a  consequence  of  its  own  practice  of  said
inventions, whether or not JHU or said Inventors, either jointly or severally, is named as a party defendant in any such lawsuit and whether or
not JHU or the Inventors are alleged to be negligent or otherwise responsible for any injuries to persons or property, except and to the extent
that such judgments, fees, expenses or other costs arise from or are related to (i) an alleged breach by JHU of any of the representations or
warranties set forth in Paragraph 6.2, or (ii) JHU having granted conflicting rights under the PATENT RIGHTS to a third party. Practice of
the  inventions  covered  by  LICENSED  PRODUCT(S),  by  an  AFFILIATED  COMPANY,  SUBLICENSEE,  or  an  agent  or  a  third  party  on
behalf of or for the account of Company or by a third party who purchases LICENSED PRODUCT(S) from Company, shall be considered
Company’s practice of said inventions for purposes of this Paragraph. The obligation of Company to defend and indemnify as set out in this
Paragraph shall survive the termination of this Agreement, shall continue even after assignment of rights and responsibilities to an affiliate or
sublicensee, and shall not be limited by any other limitation of liability elsewhere in this Agreement. JHU shall (a) provide prompt written
notice to Company of any claim, demand or action arising out of the indemnified activities after JHU has knowledge of such claim, demand

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

13

or  action;  (b)  permit  Company  to  assume  full  responsibility  to  investigate,  prepare  for  and  defend  against  any  such  claim  or  demand;  (c)
assist Company, at Company’s reasonable expense, in the investigation of, preparation for and defense of any such claim or demand; and (d)
not compromise or settle such claim or demand without Company’s written consent.

ARTICLE 8

CONFIDENTIALITY

8.1

Confidentiality.  If  necessary,  the  parties  will  exchange  information,  which  they  consider  to  be  confidential.  The
recipient of such information agrees to accept the disclosure of said information which is marked as confidential at the time it is sent to the
recipient, and to employ all reasonable efforts to maintain such information (“Confidential Information”) secret and confidential, such efforts
to be no less than the degree of care employed by the recipient to preserve and safeguard its own confidential information, and in any event
no less than a reasonable degree of care. Except in connection with the activities contemplated by this Agreement, Confidential Information
disclosed  by  a  party  to  the  other  party  shall  not  be  used  by  the  receiving  party  and  shall  not  be  disclosed  or  revealed  to  anyone  except
employees, consultants, collaborators, investors and prospective investors of the recipient who have a need to know the information and who
have entered into a secrecy agreement with the recipient under which such employees are required to maintain confidential the proprietary
information of the recipient and such employees shall be advised by the recipient of the confidential nature of the information and that the
information shall be treated accordingly.

The obligations of this Paragraph 8.1 shall also apply to AFFILIATED COMPANIES and/or SUBLICENSEE(S) provided such
information of JHU by Company. JHU’s, Company’s, AFFILIATED COMPANIES, and SUBLICENSEES’ obligations under this Paragraph
8.1 shall extend until three (3) years after the termination of this Agreement.

8.2

Exceptions. The recipient’s obligations under Paragraph 8.1 shall not extend to any part of the information:

a.

b.

c.

d.

that can be demonstrated to have been in the public domain or publicly known and readily available to the
trade or the public prior to the date of the disclosure; or

that can be demonstrated, from written records to have been in the recipient’s possession or readily available
to  the  recipient  from  another  source  not  under  obligation  of  secrecy  to  the  disclosing  party  prior  to  the
disclosure; or

that  becomes  part  of  the  public  domain  or  publicly  known  by  publication  or  otherwise,  not  due  to  any
unauthorized act by the recipient; or

that  is  demonstrated  from  written  records  to  have  been  developed  by  or  for  the  receiving  party  without
reference to confidential information disclosed by the disclosing party.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

14

 
 
 
 
8.3

Permitted Use. The receiving party may use or disclose Confidential Information of the disclosing party to the extent
necessary  to  exercise  its  rights  hereunder  (including  in  the  case  of  Company,  commercialization  and/or  sublicensing  of  LICENSED
PRODUCTS) or fulfill its obligations and/or duties hereunder and in filing for, prosecuting or maintaining any proprietary rights, prosecuting
or  defending  litigation,  complying  with  applicable  governmental  regulations  and/or  submitting  information  to  tax,  regulatory  agencies  or
other  governmental  authorities;  provided  that  if  the  receiving  party  is  required  by  law  to  make  any  public  disclosures  of  Confidential
Information of the disclosing party, to the extent it may legally do so, it will give reasonable advance notice to the disclosing party of such
disclosure  and  will  use  its  reasonable  efforts  to  secure  confidential  treatment  of  Confidential  Information  prior  to  its  disclosure  (whether
through protective orders or otherwise).

8.4

Confidential  Terms.  Except  as  expressly  provided  herein,  each  party  agrees  not  to  disclose  any  terms  of  this
Agreement to any third party without the consent of the other party, except (a) as required by securities or other applicable laws or by the
disclosure  requirements  of  any  securities  exchange  or  other  stock  market  on  which  a  party’s  securities  are  or  are  to  be  traded,  (b)  to
prospective  and  other  investors,  SUBLICENSEES  and  acquirers  and  (c)  to  such  party’s  accountants,  attorneys  and  other  professional
advisors. Additionally, Company consents to (i) JHU’s disclosure of the terms and conditions of this Agreement to all INVENTORS upon
their  request,  and  (ii)  JHU’s  acknowledging  to  third  parties  the  existence  of  this  Agreement  and  the  extent  of  the  licenses  granted  to
LICENSEE and AFFILIATES under Article 3 hereof.

8.5

Right  to  Publish.  JHU  may  publish  manuscripts,  abstracts  or  the  like  describing  the  inventions  disclosed  in  the
PATENT RIGHTS, subject to the terms set forth below. To avoid loss of patent rights as a result of premature public disclosure of patentable
information and/or inadvertent disclosure of Company CONFIDENTIAL INFORMATION, JHU agrees to submit to Company, at least sixty
(60)  days  prior  to  submission  for  publication  or  disclosure,  materials  intended  for  publication  or  disclosure  describing  the  inventions
disclosed in the PATENT RIGHTS. Company shall notify JHU within thirty (30) days of receipt of such materials whether or not Company
(a) desires to file (or have filed) pursuant to Paragraph 4.1 a patent application on any invention disclosed in such materials to in order to
protect  such  invention(s)  in  advance  of  publication  or  public  disclosure  or  (b)  believes  that  such  materials  contain  CONFIDENTIAL
INFORMATION of Company that Company wishes to have removed from the publication. In the event that Company informs JHU within
such thirty (30) day period that it desires to file (or have filed) a patent application on any invention disclosed in such materials, JHU agrees
to withhold publication and disclosure of such materials until such time as (i) a patent application claiming and disclosing such invention has
been  filed  or,  (ii)  sixty  (60)  days  have  elapsed  since  the  materials  intended  for  publication  or  disclosure  were  submitted  to  Company  for
review,  whichever  occurs  first.  In  the  event  that  within  such  thirty  (30)  day  period  Company  requests  that  JHU  remove  Company’s
CONFIDENTIAL  INFORMATION  from  such  materials,  JHU  agrees  to  remove  all  CONFIDENTIAL  INFORMATION  identified  by
Company  prior  to  making  such  filing  or  disclosure.  Subject  to  foregoing,  JHU  and  Inventors  shall  be  free  to  publish  manuscripts  and
abstracts or the like directed to work done at JHU related to the PATENT RIGHTS, KNOW-HOW AND MATERIALS.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

15

ARTICLE 9

TERM & TERMINATION

9.1

Term.  The  term  of  this  Agreement  shall  commence  on  the  EFFECTIVE  DATE  and  shall  continue,  in  each  country,
until the date of expiration of the last to expire patent included within PATENT RIGHTS in that country or if no patents issue then for a term
of twenty (20) years from the EFFECTIVE DATE of this Agreement. Company’s license to the KNOW-HOW AND MATERIALS, as well
as Company’s right to use JHU confidential information under Paragraph 8.1, shall survive the expiration, (but not an earlier termination) of
this Agreement.

9.2

Termination By Either Party. This Agreement may be terminated by either party, in the event that the other party (a)
files or has filed against it a petition under the Bankruptcy Act that is not dismissed within sixty (60) days, makes an assignment for the
benefit of creditors, has a receiver appointed for it or a substantial part of its assets and such receivership is not terminated within sixty (60)
days, or otherwise takes advantage of any statute or law designed for relief of debtors or (b) fails to perform or otherwise breaches any of its
obligations hereunder, if, following the giving of notice by the terminating party of its intent to terminate and stating the grounds therefor, the
party receiving such notice shall not have cured the failure or breach within sixty (60) days; provided, however, that in the event the party
receiving the notice disputes the alleged failure to perform or breach in good faith, such sixty (60) day cure period shall commence upon
determination by a court of competent jurisdiction (or arbitrator if the parties agree to arbitrate the matter) that the alleged failure to perform
or breach exists. In no event, however, shall such notice or intention to terminate be deemed to waive any rights to damages or any other
remedy which the party giving notice of breach may have as a consequence of such failure or breach.

9.3

Termination by Company.  Company  may  terminate  this  Agreement  and  the  license  granted  herein,  for  any  reason,
upon  giving  JHU  ninety  (90)  days  written  notice.  Company  may  terminate  its  license  with  respect  to  any  particular  patent  or  patent
application, or as to any particular LICENSED PRODUCT, with 60 days’ notice to JHU. From and after the effective date of a termination
under this Paragraph 9.3 with respect to a particular patent or application, such patent(s) and patent application(s) in the particular country
shall  cease  to  be  within  the  PATENT  RIGHTS  for  all  purposes  of  this  Agreement,  and  all  rights  and  obligations  of  Company  under  this
Agreement with respect to such patent(s) and patent application(s) shall terminate and Exhibit D shall be considered amended accordingly.
Company  will  not  be  required  to  reimburse  JHU  for  patent  costs  incurred  after  the  60-day  notice  period  for  such  patents  or  patent
applications. From and after the effective date of a termination under this Paragraph 9.3 with respect to a particular LICENSED PRODUCT,
the license granted under Paragraph 2.1 above shall terminate with respect to such LICENSED PRODUCT, and the same shall cease to be a
LICENSED PRODUCT for all purposes of this Agreement. Upon a termination of this Agreement in its entirety under this Paragraph 9.3, all
rights and obligations of the parties shall terminate, except as provided in Paragraph 9.4 below.

9.4

Obligations  and  Duties  upon  Termination.  If  this  Agreement  is  terminated,  both  parties  shall  be  released  from  all
obligations  and  duties  imposed  or  assumed  hereunder  to  the  extent  so  terminated,  except  as  expressly  provided  to  the  contrary  in  this
Agreement. Upon termination, both parties shall cease any further use of the confidential information disclosed to the receiving party by the
other party. Termination of this Agreement, for whatever reason, shall not affect the

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

16

obligation of either party to make any payments for which it is liable prior to or upon such termination. Termination shall not affect JHU’s
right  to  recover  unpaid  royalties,  fees,  reimbursement  for  patent  expenses,  or  other  forms  of  financial  compensation  incurred  prior  to
termination.  Upon  termination  Company  shall  submit  a  final  royalty  report  to  JHU  and  any  royalty  payments,  fees,  unreimbursed  patent
expenses  and  other  financial  compensation  due  JHU  shall  become  immediately  payable.  Notwithstanding  any  other  provision  of  this
Agreement, upon termination of this Agreement, any sublicenses granted in accordance with Paragraph 2.2 shall survive and, upon request,
each  SUBLICENSEE  shall  become  a  direct  licensee  of  JHU,  provided  that  JHU’s  obligations  to  SUBLICENSEE(S)  are  no  greater  than
JHU’s  obligations  to  Company  under  this  Agreement  and  that  such  SUBLICENSEE’S  obligations  to  JHU  shall  be  no  greater  than
Company’s obligations to JHU under this Agreement. Company shall provide written notice of such to each SUBLICENSEE(S) with a copy
of such notice provided to JHU.

10.1

Use of Name.

ARTICLE 10
MISCELLANEOUS

10.1.1

10.1.2

10.1.3

10.1.4

Except  as  specifically  permitted  in  Sections  16.2.3,  16.2.4  and  16.2.5  below,  nothing  contained  in  this
Agreement  confers  any  right  to  either  party  hereto  to  use  in  advertising,  publicity,  or  other  promotional
activities  any  name,  trade  name,  trademark,  or  other  designation  of  the  other  party  hereto  (including  any
contraction, abbreviation or simulation of any of the foregoing).

Unless  otherwise  required  by  law,  LICENSEE  is  prohibited  from  using  the  name  “The  Johns  Hopkins
University” or the name of any affiliate of the Johns Hopkins University, including but not limited to The
Johns Hopkins Health System Corporation, or any of its hospitals or affiliates, or the names of any of their
respective  faculty,  employees,  students  or  INVENTORS,  in  advertising,  publicity,  or  other  promotional
activities, without JHU’s prior written approval of such use.

LICENSEE hereby grants JHU permission to include LICENSEE’s name and a link to LICENSEE’s website
in JHU’s annual reports and on JHU’s website to showcase technology transfer-related stories.

JHU  shall  have  the  right  to  list  LICENSEE  and  display  the  logotype  or  symbol  of  LICENSEE  on  JHU’s
website and on JHU publications as a licensee startup company based upon JHU technology.

10.2

No Partnership. Nothing in this Agreement shall be construed to create any agency, employment, partnership, joint
venture  or  similar  relationship  between  the  parties  other  than  that  of  a  licensor/licensee.  Neither  party  shall  have  any  right  or  authority
whatsoever to incur any liability or obligation (express or implied) or otherwise act in any manner in the name or on the behalf of the other,
or to make any promise, warranty or representation binding on the other.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

17

 
 
 
 
10.3

Notice of Claim. Each party shall give the other or its representative immediate notice of any suit or action filed, or
prompt  notice  of  any  claim  made,  against  them  arising  out  of  the  performance  of  this  Agreement  or  arising  out  of  the  practice  of  the
inventions licensed hereunder.

10.4

Product Liability.  Prior  to  initial  human  testing  or  first  commercial  sale  of  any  LICENSED  PRODUCT(S)  as  the
case  may  be  in  any  particular  country,  Company  shall  establish  and  maintain,  covering  the  Company’s  liability  in  each  country  in  which
Company,  an  AFFILIATED  COMPANY  or  SUBLICENSEE(S)  shall  test  or  sell  LICENSED  PRODUCT(S),  product  liability  or  other
appropriate  insurance  coverage  in  the  minimum  amount  of  [***]  ($[***])  per  claim  and  will  annually  present  evidence  to  JHU  that  such
coverage  is  being  maintained.  Upon  JHU’s  request,  Company  will  furnish  JHU  with  a  Certificate  of  Insurance  of  each  product  liability
insurance  policy  obtained.  JHU  shall  be  listed  as  an  additional  insured  in  Company’s  said  insurance  policies.  If  such  Product  Liability
insurance is underwritten on a ‘claims made’ basis, Company agrees that any change in underwriters during the term of this Agreement will
require the purchase of ‘prior acts’ coverage to ensure that coverage will be continuous throughout the term of this Agreement.

10.5

Governing  Law.  This  Agreement  shall  be  construed,  and  legal  relations  between  the  parties  hereto  shall  be
determined, in accordance with the laws of the State of Maryland applicable to contracts solely executed and wholly to be performed within
the State of Maryland without giving effect to the principles of conflicts of laws. Any disputes between the parties to this Agreement shall be
brought in the state or federal courts of Maryland. Both parties agree to waive their right to a jury trial.

10.6

Notice.  All  notices  or  communication  required  or  permitted  to  be  given  by  either  party  hereunder  shall  be  deemed
sufficiently given if mailed by registered mail or certified mail, return receipt requested, or sent by overnight courier providing evidence of
delivery, such as Federal Express, to the other party at its respective address set forth below or to such other address as one party shall give
notice of to the other from time to time hereunder. Mailed notices shall be deemed to be received on the third business day following the date
of mailing. Notices sent by overnight courier shall be deemed received the following business day.

If to Company:

Unity Biotechnology, Inc.

If to JHU:

Director

3280 Brisbane Blvd
Brisbane CA 94005
Attn: CEO
(415) 328-5504

Technology Ventures
Johns Hopkins University
100 N. Charles Street
5th Floor
Baltimore, MD 21201
Attn: Agrmt A30652

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

18

10.7

Compliance  with  All  Laws.  In  all  activities  undertaken  pursuant  to  this  Agreement,  both  JHU  and  Company
covenant and agree that each will in all material respects comply with such Federal, state and local laws and statutes, as may be in effect at
the time of performance and all valid rules, regulations and orders thereof regulating such activities.

10.8

Successors and Assigns.  Neither this Agreement  nor  any  of  the  rights  or  obligations  created  herein,  except for the
right to receive any remuneration hereunder, may be assigned by either party, in whole or in part, without the prior written consent of the
other  party,  except  that  either  party  shall  be  free  to  assign  this  Agreement  in  connection  with  its  merger  or  consolidation  or  any  sale  of
substantially  all  of  its  assets  without  the  consent  of  the  other.  This  Agreement  shall  bind  and  inure  to  the  benefit  of  the  successors  and
permitted assigns of the parties hereto.

10.9

No Waivers; Severability. No waiver of any breach of this Agreement shall constitute a waiver of any other breach
of the same or other provision of this Agreement, and no waiver shall be effective unless made in writing. Any provision hereof prohibited
by or unenforceable under any applicable law of any jurisdiction shall as to such jurisdiction be deemed ineffective and deleted herefrom
without affecting any other provision of this Agreement. It is the desire of the parties hereto that this Agreement be enforced to the maximum
extent permitted by law, and should any provision contained herein be held by any governmental agency or court of competent jurisdiction to
be void, illegal and unenforceable, the parties shall negotiate in good faith for a substitute term or provision which carries out the original
intent of the parties.

10.10

Entire Agreement; Amendment. Company and JHU acknowledge that they have read this entire Agreement and
that  this  Agreement,  including  the  attached  Exhibits  constitutes  the  entire  understanding  and  contract  between  the  parties  hereto  and
supersedes  any  and  all  prior  or  contemporaneous  oral  or  written  communications  with  respect  to  the  subject  matter  hereof,  all  of  which
communications are merged herein. It is expressly understood and agreed that (i) there being no expectations to the contrary between the
parties hereto, no usage of trade, verbal agreement or another regular practice or method dealing within any industry or between the parties
hereto shall be used to modify, interpret, supplement or alter in any manner the express terms of this Agreement; and (ii) this Agreement
shall not be modified, amended or in any way altered except by an instrument in writing signed by both of the parties hereto.

10.11

Delays  or  Omissions.  Except  as  expressly  provided  herein,  no  delay  or  omission  to  exercise  any  right,  power  or
remedy accruing to any party hereto, shall impair any such right, power or remedy to such party nor shall it be construed to be a waiver of
any such breach or default, or an acquiescence therein, or in any similar breach or default be deemed a waiver of any other breach or default
theretofore or thereafter occurring. Any waiver, permit, consent or approval of any kind or character on the part of any party of any breach or
default under this Agreement, or any waiver on the part of any party of any provisions or conditions of this Agreement, must be in writing
and  shall  be  effective  only  to  the  extent  specifically  set  forth  in  such  writing.  All  remedies  either  under  this  Agreement  or  by  law  or
otherwise afforded to any party, shall be cumulative and not alternative.

10.12

Force Majeure. If either party fails to fulfill its obligations hereunder (other than an obligation for the payment of

money), when such failure is due to an act of God, or other

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

19

circumstances beyond its reasonable control, including but not limited to fire, flood, civil commotion, riot, war (declared and undeclared),
revolution, or embargoes, then said failure shall be excused for the duration of such event and for such a time thereafter as is reasonable to
enable the parties to resume performance under this Agreement, provided however, that in no event shall such time extend for a period of
more than one hundred eighty (180) days.

10.13

Further Assurances. Each party shall, at any time, and from time to time, prior to or after the EFFECTIVE DATE
of this Agreement, at reasonable request of the other party, execute and deliver to the other such instruments and documents and shall take
such actions as may be required to more effectively carry out the terms of this Agreement.

10.14

Survival. All representations, warranties, covenants and agreements made herein and which by their express terms
or by implication are to be performed after the execution and/or termination hereof, or are prospective in nature, shall survive such execution
and/or termination, as the case may be. This shall include Paragraphs 3.7 (Late Payments), 5.2 (Records), and Articles 6, 7, 8, 9, and 10.

10.15

No Third Party Beneficiaries. Nothing in this Agreement shall be construed as giving any person, firm, corporation
or other entity, other than the parties hereto and their successors and permitted assigns, any right, remedy or claim under or in respect of this
Agreement or any provision hereof.

10.16

Headings.  Article  headings  are  for  convenient  reference  and  not  a  part  of  this  Agreement.  All  Exhibits  are

incorporated herein by this reference.

10.17

Counterparts. This Agreement may be executed in counterparts, each of which shall be deemed an original and all

of which when taken together shall be deemed but one instrument.

IN WITNESS WHEREOF, this Agreement shall take effect as of the EFFECTIVE DATE when it has been executed below by the

duly authorized representatives of the parties.

THE JOHNS HOPKINS UNIVERSITY

UNITY BIOTECHNOLOGY, INC.

/s/ Neil Veloso
Neil Veloso
Executive Director
Johns Hopkins Technology Ventures

11/3/2016
(Date)

/s/ Nathaniel David
Nathaniel David
Title:

11/3/2016
(Date)

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

20

 
 
 
 
I have read and agree to abide by the terms of this Agreement:

/s/ 
Elisseeff
Dr. Jennifer Elisseeff

EXHIBIT A. LICENSE FEE & ROYALTIES.
EXHIBIT B. SALES & ROYALTY REPORT FORM.
EXHIBIT C. INTENTIONALLY LEFT BLANK.
EXHIBIT D. PATENT APPLICATIONS.
EXHIBIT E. FORM OF STOCK ISSUANCE AGREEMENT

Date

21

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

Jennifer
11/28/2016

 
 
 
 
 
1.

Minimum Annual Royalties: The minimum annual royalties pursuant to Paragraph 3.1 are twelve thousand dollars ($[***]).

2.
Company, AFFILIATED COMPANIES and SUBLICENSEES is:

Royalties: The running royalty rate payable by Company under Paragraph 3.2 for NET SALES of ROYALTY PRODUCTS by

FEES & ROYALTIES

Portion of Annual Sales
[***]
>[***]

Royalty Rate
[***]
[***]

For clarity, no royalty shall be payable with respect to NET SALES of ROYALTY PRODUCTS unless at such time as the applicable NET
SALES accrue, there is within the PATENT RIGHTS either a U.S. or EP patent containing a NEOCHONDROGENESIS CLAIM.

If Company, its AFFILIATED COMPANY or SUBLICENSEE is required to pay a third party amounts with respect to a ROYALTY
PRODUCT under agreements for patent rights or other technologies which Company, its AFFILIATED COMPANY or SUBLICENSEE,
determines are necessary to license or acquire with respect to such ROYALTY PRODUCT, Company may deduct such amount owing to
such third parties (prior to any reductions) from the royalty owing to JHU for the sale of such ROYALTY PRODUCT. Notwithstanding the
foregoing, in no event shall the total aggregate amount payable to JHU in any royalty period be reduced to less than [***] percent ([***]%)
of the amounts that would otherwise be due JHU in such royalty period, and (b) Company shall not be entitled to deduct any royalties or
other payments made under the Existing Agreements. If, in any royalty period, Company is not able to fully recover its [***] percent
([***]%) portion of the payments due to a third party, it shall be entitled to carry forward such right of off-set to future semi-annual periods
with respect to the excess amount. As used herein, “Existing Agreements means (a) that certain Exclusive License Agreement between
Company and the Mayo Foundation for Medical Education and Research originally entered into by the parties effective June 28th, 2013; (b)
that certain Exclusive License Agreement between Company and the Buck Institute for Research on Aging originally entered into by the
parties effective February 3rd, 2014; (c) that certain Exclusive License Agreement between Company and the Board of Trustees of the
University of Arkansas originally entered into by the parties effective April 28th, 2015, and (d) the Ascentage Agreements, where
“Ascentage Agreements” means (i) that certain Compound Library and Option Agreement entered into by and between Company and
Ascentage Pharma Group Corp. Ltd., (“Ascentage”) as of February 2nd, 2016, (ii) that certain APG-1252 License Agreement entered into by
and between Company and Ascentage as of February 2nd, 2016, and (iii) any Compound License Agreements entered into by and between
Company and Ascentage as of the Effective Date of the definitive license agreement or at any time thereafter.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

22

 
3.

Partnership Proceeds: The percent of PARTNERSHIP PROCEEDS payable under Paragraph 3.3 is [***]%, provided that:

Company shall only be obligated to share [***]% of that portion of the PARTNERSHIP PROCEEDS that exceeds the then current
aggregate amount spent by Company on the development of the LICENSED PRODUCTS included in such sublicense as of the
date such PARTNERSHIP PROCEEDS were received; and

Company’s total payment obligations to JHU with respect to PARTNERSHIP PROCEEDS shall be capped at [***] U.S. Dollars
(USD$[***]).

Equity Grant. Company shall issue to JHU 65,000 shares of Company common stock upon the first to occur of (i) acceptance for

4.
review by the U.S. Food and Drug Administration of a new drug application for a Royalty Product, or (ii) or acceptance for review by the
European Medicines Agency of a marketing approval application for a Royalty Product. The events described in subsections (i) and (ii)
above, each a “triggering event”.

Notwithstanding  the  foregoing,  if  at  the  time  of  the  occurrence  of  the  triggering  event,  there  is  not  either  a  U.S.  or  EP  patent  within  the
PATENT  RIGHTS  containing  a  NEOCHONDROGENESIS  CLAIM,  then  the  issuance  of  shares  of  Company  common  stock  shall  be
deferred until such time as there is a NEOCHONDROGENESIS CLAIM.

5.

Milestones. The milestones payable under Paragraph 3.5 are:

Approval Milestones

(i)

(ii)

(iii)

[***] U.S. Dollars (USD$[***]) upon first receipt by Company, an AFFILIATED COMPANY or SUBLICENSEE of marketing
approval for a ROYALTY PRODUCT from the U.S. Food and Drug Administration.

[***] U.S. Dollars (USD$[***]) upon first receipt by Company, an AFFILIATED COMPANY or SUBLICENSEE of marketing
approval for a ROYALTY PRODUCT from the European Medicines Agency.

[***] U.S. Dollars (USD$[***]) upon first receipt by Company, an AFFILIATED COMPANY or SUBLICENSEE of marketing
approval for a ROYALTY PRODUCT from the Ministry Health Labor and Welfare in Japan.

Notwithstanding  the  foregoing,  in  the  event  that  at  the  time  of  achievement  of  one  or  more  of  the  foregoing  development
milestones there is not either a U.S. or EP patent within the PATENT RIGHTS containing a NEOCHONDROGENESIS CLAIM,
then payment of such milestones shall be deferred until such time as there is a NEOCHONDROGENESIS CLAIM.

Each of the foregoing development milestone payments shall be payable only once and the overall payments due with respect to
the foregoing milestones shall in no event exceed [***] U.S. Dollars (USD$[***]).

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

23

Sales Milestones

(i)

(ii)

(iii)

(iv)

[***]  U.S.  Dollars  (USD$[***])  upon  the  total  annual  royalty-bearing  Net  Sales  for  a  ROYALTY  PRODUCT  on  a  worldwide
basis first reaching $[***].

[***]  U.S.  Dollars  (USD$[***])  upon  the  total  annual  royalty-bearing  Net  Sales  for  a  ROYALTY  PRODUCT  on  a  worldwide
basis first reaching $[***].

[***]  U.S.  Dollars  (USD$[***])  upon  the  total  annual  royalty-bearing  Net  Sales  for  a  ROYALTY  PRODUCT  on  a  worldwide
basis first reaching $[***].

[***]  U.S.  Dollars  (USD$[***])  upon  the  total  annual  royalty-bearing  Net  Sales  for  a  ROYALTY  PRODUCT  on  a  worldwide
basis first reaching $[***].

Each  of  the  foregoing  sales  milestone  payments  shall  be  payable  only  once  and  the  overall  payments  due  with  respect  to  the  foregoing
milestones shall in no event exceed [***] U.S. Dollars (USD$[***]).

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

24

QUARTERLY SALES & ROYALTY AND PARTNERSHIP PROCEEDS REPORT 

FOR LICENSE AGREEMENT BETWEEN ___________________ AND 

THE JOHNS HOPKINS UNIVERSITY DATED

___________________

FOR PERIOD OF _________________ TO _________________ 

TOTAL ROYALTIES DUE FOR THIS PERIOD $___________________

PRODUCT ID

PRODUCT NAME

*JHU REFERENCE

1st COMMERCIAL SALE DATE

TOTAL NET SALES

ROYALTY RATE

AMOUNT DUE

Report of Partnership Proceeds:

Name of Sublicensee:
Date of Sublicense:
Partnership Proceeds Received:
Amount due:

* Please provide the JHU Reference Number or Patent Reference

This  report  format  is  to  be  used  to  report  quarterly  royalty  statements  to  JHU.  It  should  be  placed  on  Company  letterhead  and

accompany any royalty payments due for the reporting period. This report shall be submitted even if no sales are reported.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

25

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
EXHIBIT C

 – INTENTIONALLY LEFT BLANK

EXHIBIT D

 – PATENT APPLICATIONS

C13890 –

[***]

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

26

 
EXHIBIT E

 – FORM STOCK ISSUANCE AGREEMENT

UNITY BIOTECHNOLOGY, INC. 
RESTRICTED STOCK ISSUANCE AGREEMENT

This  Restricted  Stock  Issuance  Agreement  (the  “Agreement”)  is  made  as  of  [  ],  20[  ]  by  and  between  Unity  Biotechnology,  Inc.,  a
Delaware corporation (the “Company”), and The Johns Hopkins University, a Maryland corporation (the “Grantee”). Reference is
made  to  that  certain  License  Agreement  effective  as  of  [  ],  2016  by  and  between  the  Company  and  the  Grantee  (the  “License
Agreement”). Capitalized terms not otherwise defined herein shall have the applicable meaning in the License Agreement.
In consideration of the mutual covenants and representations set forth below, the Company and Grantee agree as follows:

1.

Grant  of  the  Shares.  Subject  to  the  terms  and  conditions  of  this  Agreement,  the  Company  agrees  to  grant  to
Grantee,  and  Grantee  agree  to  acquire  from  the  Company,  on  the  Closing  (as  defined  below)  [65,000]  shares  of  the  Company’s
Common  Stock,  $0.0001  par  value  per  share  (the  “Shares”).  The  number  of  shares  is  in  full  and  complete  satisfaction  of  the
Company’s  obligations  under  Section  3.4  of  the  License  Agreement  for  achievement  of  the  following  Milestone  Event:  [INSERT
MILESTONE EVENT].
2.

Closing. The transfer of the Shares shall occur at a closing (the “Closing”) to be held on the date first set forth
above, or at any other time mutually agreed upon by the Company and Grantee. The Closing will take place at the principal office of
the  Company  or  at  such  other  place  as  shall  be  designated  by  the  Company.  As  promptly  after  the  Closing  as  practicable,  the
Company will issue a stock certificate, registered in the name of Grantee, reflecting the Shares.

3.

Restrictions on Transfer.

A.

Investment  Representations  and  Legend  Requirements.  The  Grantee  hereby  make  the  investment
representations listed on Exhibit A to the Company as of the date of this Agreement and as of the date of the Closing, and agrees that
such  representations  are  incorporated  into  this  Agreement  by  this  reference,  such  that  the  Company  may  rely  on  them  in  issuing  the
Shares. Grantee understand and agree that the Company shall cause the legends set forth below, or substantially equivalent legends, to
be  placed  upon  any  certificate(s)  evidencing  ownership  of  the  Shares,  together  with  any  other  legends  that  may  be  required  by  the
Company or by applicable state or federal securities laws:

THE  SECURITIES  REPRESENTED  BY  THIS  CERTIFICATE  HAVE  NOT  BEEN
REGISTERED  UNDER  THE  SECURITIES  ACT  OF  1933,  AS  AMENDED,  OR  THE
SECURITIES  LAWS  OF  ANY  STATE,  AND  MAY  NOT  BE  SOLD,  TRANSFERRED,
ASSIGNED,  PLEDGED  OR  HYPOTHECATED  UNLESS  AND  UNTIL  REGISTERED
UNDER SUCH ACT AND/OR APPLICABLE STATE SECURITIES LAWS, OR UNLESS
THE  COMPANY  HAS  RECEIVED  AN  OPINION  OF  COUNSEL  OR  OTHER
EVIDENCE,  REASONABLY  SATISFACTORY  TO  THE  COMPANY  AND  ITS
COUNSEL, THAT SUCH REGISTRATION IS NOT REQUIRED.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

27

THE SHARES REPRESENTED BY THIS CERTIFICATE ARE SUBJECT TO CERTAIN
RESTRICTIONS  ON  TRANSFER,  A  RIGHT  OF  FIRST  REFUSAL,  AND  A  LOCK-UP
PERIOD IN THE EVENT OF A PUBLIC OFFERING HELD BY THE ISSUER OR ITS
ASSIGNEE(S)  AS  SET  FORTH  IN  THE  RESTRICTED  STOCK  ISSUANCE
AGREEMENT  BETWEEN  THE  ISSUER  AND  THE  ORIGINAL  HOLDER  OF  THESE
SHARES, A COPY OF WHICH MAY BE OBTAINED AT THE PRINCIPAL OFFICE OF
THE ISSUER. SUCH TRANSFER RESTRICTIONS, RIGHT OF FIRST REFUSAL AND
LOCK-UP PERIOD ARE BINDING ON TRANSFEREES OF THESE SHARES.
THE  SHARES  REPRESENTED  BY  THIS  CERTIFICATE  HAVE  NOT  BEEN
REGISTERED UNDER  THE  SECURITIES  ACT  OF  1933,  AS  AMENDED, AND HAVE
BEEN  ACQUIRED  FOR  INVESTMENT  AND  NOT  WITH  A  VIEW  TO,  OR  IN
CONNECTION  WITH,  THE  SALE  OR  DISTRIBUTION  THEREOF.  NO  TRANSFER
MAY  BE  EFFECTED  WITHOUT  AN  EFFECTIVE  REGISTRATION  STATEMENT
RELATED  THERETO  OR  AN  OPINION  OF  COUNSEL  IN  A  FORM  REASONABLY
SATISFACTORY  TO  THE  COMPANY  THAT  SUCH  REGISTRATION  IS  NOT
REQUIRED UNDER THE SECURITIES ACT OF 1933, AS AMENDED.
B.

Stop-Transfer  Notices.  Grantee  agree  that  to  ensure  compliance  with  the  restrictions  referred  to  herein,
the Company may issue appropriate “stop transfer” instructions to its transfer agent, if any, and that, if the Company transfers its own
securities, it may make appropriate notations to the same effect in its own records.

Refusal to Transfer. The Company shall not be required (i) to transfer on its books any Shares that have
been sold or otherwise transferred in violation of any of the provisions of this Agreement or (ii) to treat as owner of such Shares or to
accord the right to vote or pay dividends to any acquirer or other transferee to whom such Shares shall have been so transferred.

C.

D.

Lock-Up Period. Grantee hereby agree that Grantee shall not sell, offer, pledge, contract to sell, grant any
option or contract to purchase, purchase any option or contract to sell, grant any right or warrant to purchase, lend or otherwise transfer
or encumber, directly or indirectly, any Shares or other securities of the Company, nor shall Grantee enter into any swap, hedging or
other arrangement that transfers to another, in whole or in part, any of the economic consequences of ownership of any Shares or other
securities of the Company, during the period from the filing of the first registration statement of the Company filed under the Securities
Act  of  1933,  as  amended  (the  “Securities  Act”),  that  includes  securities  to  be  sold  on  behalf  of  the  Company  to  the  public  in  an
underwritten  public  offering  under  the  Securities  Act  through  the  end  of  the  180-day  period  following  the  effective  date  of  such
registration  statement  (or  such  other  period  as  may  be  requested  by  the  Company  or  the  underwriters  to  accommodate  regulatory
restrictions on (i) the publication or other distribution of research reports and (ii) analyst recommendations and opinions, including, but
not limited to, the

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

28

restrictions  contained  in  NASD  Rule  2711(f)(4)  or  NYSE  Rule  472(f)(4),  or  any  successor  provisions  or  amendments  thereto).  The
obligations described in this section shall not apply to a registration relating solely to employee benefit plans on Form S-1 or Form S-8 or
similar forms that may be promulgated in the future, or a registration relating solely to a transaction on Form S-4 or similar forms that
may be promulgated in the future. Grantee further agree, if so requested by the Company or any representative of its underwriters, to
enter into such underwriter’s standard form of “lockup” or “market standoff” agreement in a form satisfactory to the Company and such
underwriter. The Company may impose stop-transfer instructions with respect to securities subject to the foregoing restrictions until the
end of any such restriction period.

4.

Company’s Right of First Refusal. Before any Shares acquired by the Grantee pursuant to this Agreement (or any
beneficial interest in such Shares) may be sold, transferred, encumbered or otherwise disposed of in any way (whether by operation
of  law  or  otherwise)  by  the  Grantee  or  any  subsequent  transferee  (each  a  “Holder”),  such  Holder  must  first  offer  such  Shares  or
beneficial interest to the Company and/or its assignee(s) as follows:

A.

Notice  of  Proposed  Transfer.  The  Holder  shall  deliver  to  the  Company  a  written  notice  stating:  (i)  the
Holder’s bona fide intention to sell or otherwise transfer the Shares; (ii) the name of each proposed transferee; (iii) the number of Shares
to  be  transferred  to  each  proposed  transferee;  (iv)  the  bona  fide  cash  price  or  other  consideration  for  which  the  Holder  proposes  to
transfer  the  Shares;  and  (v)  that  by  delivering  the  notice,  the  Holder  offers  all  such  Shares  to  the  Company  and/or  its  assignee(s)
pursuant to this section and on the same terms described in the notice.

B.

Exercise  of  Right  of  First  Refusal.  At  any  time  within  30  days  after  receipt  of  the  Holder’s  notice,  the
Company  and/or  its  assignee(s)  may,  by  giving  written  notice  to  the  Holder,  elect  to  purchase  all,  but  not  less  than  all,  of  the  Shares
proposed to be transferred to any one or more of the proposed transferees, at the purchase price determined in accordance with Section
4.C.

C.

Purchase  Price.  The  purchase  price  for  the  Shares  purchased  by  the  Company  and/or  its  assignee(s)
under this section shall be the price listed in the Holder’s notice. If the price listed in the Holder’s notice includes consideration other
than cash, the cash equivalent value of the non-cash consideration shall be determined by the Board of Directors of the Company in its
sole discretion.

D.

Payment.  Payment  of  the  purchase  price  shall  be  made,  at  the  option  of  the  Company  and/or  its
assignee(s), in cash (by check), by cancellation of all or a portion of any outstanding indebtedness of the Holder to the Company and/or
its assignee(s), or by any combination thereof within 30 days after receipt by the Company of the Holder’s notice (or at such later date as
is called for by such notice).

E.

Holder’s Right to Transfer. If all of the Shares proposed in the notice to be transferred to a given proposed
transferee are not purchased by the Company and/or its assignee(s) as provided in this section, then the Holder may sell or otherwise
transfer such Shares to that proposed transferee; provided that: (i) the transfer is made only on the terms provided for in the notice, with
the  exception  of  the  purchase  price,  which  may  be  either  the  price  listed  in  the  notice  or  any  higher  price;  (ii)  such  transfer  is
consummated within 60 days after the date the notice is delivered to the Company; (iii) the transfer is effected in accordance with any
applicable securities laws, and if requested by the Company, the Holder shall have

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

29

delivered an opinion of counsel acceptable to the Company to that effect; and (iv) the proposed transferee agrees in writing to receive and
hold the Shares so transferred subject to all of the provisions of this Agreement, including but not limited to this section, and there shall
be no further transfer of such Shares except in accordance with the terms of this section. If any Shares described in a notice are not
transferred to the proposed transferee within the period provided above, then before any such Shares may be transferred, a new notice
shall be given to the Company, and the Company and/or its assignees shall again be offered the right of first refusal described in this
section.

F.

Exception for Certain Family Transfers. Notwithstanding anything to the contrary contained elsewhere in
this section, the transfer of any or all of the Shares during the Holder’s lifetime or on the Holder’s death by will or intestacy to (i) the
Holder’s  spouse;  (ii)  the  Holder’s  lineal  descendants  or  antecedents,  siblings,  aunts,  uncles,  cousins,  nieces  and  nephews  (including
adoptive  relationships  and  step  relationships),  and  their  spouses;  (iii)  the  lineal  descendants  or  antecedents,  siblings,  cousins,  aunts,
uncles, nieces and nephews of Holder’s spouse (including adoptive relationships and step relationships), and their spouses; and (iv) a
trust or other similar estate planning vehicle for the benefit of the Holder or any such person, shall be exempt from the provisions of this
section; provided that, in each such case, the transferee agrees in writing to receive and hold the Shares so transferred subject to all of
the provisions of this Agreement, including but not limited to this section, and there shall be no further transfer of such Shares except in
accordance with the terms of this section; and provided further, that without the prior written consent of the Company, which may be
withheld  in  the  sole  discretion  of  the  Company,  no  more  than  three  transfers  may  be  made  pursuant  to  this  section,  including  all
transfers by the Holder and all transfers by any transferee.

G.

Termination of Right of First Refusal. The right of first refusal contained in this section shall terminate as
to all Shares acquired hereunder upon the earlier of: (i) the closing date of the first sale of Common Stock of the Company to the general
public  pursuant  to  a  registration  statement  filed  with  and  declared  effective  by  the  Securities  and  Exchange  Commission  under  the
Securities Act, and (ii) the closing date of a Change of Control pursuant to which the holders of the outstanding voting securities of the
Company  receive  securities  of  a  class  registered  pursuant  to  Section  12  of  the  Securities  Exchange  Act  of  1934,  as  amended.  For
purposes of this Agreement, a “Change of Control” means either: (i) the acquisition of the Company by another entity by means of any
transaction or series of related transactions (including, without limitation, any reorganization, merger or consolidation or stock transfer,
but excluding any such transaction effected primarily for the purpose of changing the domicile of the Company), unless the Company’s
stockholders of record immediately prior to such transaction or series of related transactions hold, immediately after such transaction or
series of related transactions, at least 50% of the voting power of the surviving or acquiring entity (provided that the sale by the Company
of its securities for the purposes of raising additional funds shall not constitute a Change of Control hereunder); or (ii) a sale of all or
substantially all of the assets of the Company.

5.

General Provisions.

A.

Choice of Law. This Agreement shall be governed by the internal substantive laws, but not the choice of

law rules, of the State of California.

Integration.  This  Agreement,  including  all  exhibits  hereto,  together  with  the  License  Agreement,
represents  the  entire  agreement  between  the  parties  with  respect  to  the  acquisition  of  the  Shares  by  the  Grantee  and  supersedes  and
replaces any and all prior written

B.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

30

or  oral  agreements  regarding  the  subject  matter  of  this  Agreement  and  the  License  Agreement  including,  but  not  limited  to,  any
representations made during any interviews, relocation discussions or negotiations whether written or oral.

C.

Notices. Any notice, demand, offer, request or other communication required or permitted to be given by
either the Company or the Grantee pursuant to the terms of this Agreement shall be in writing and shall be deemed effectively given the
earlier  of  (i)  when  received,  (ii)  when  delivered  personally,  (iii)  one  business  day  after  being  delivered  by  facsimile  (with  receipt  of
appropriate  confirmation),  (iv)  one  business  day  after  being  deposited  with  an  overnight  courier  service  or  (v)  four  days  after  being
deposited in the U.S. mail, First Class with postage prepaid and return receipt requested, and addressed to the parties at the addresses
provided to the Company (which the Company agrees to disclose to the other parties upon request) or such other address as a party may
request by notifying the other in writing.

D.

Successors. Any successor to the Company (whether direct or indirect and whether by purchase, merger,
consolidation, liquidation or otherwise) to all or substantially all of the Company’s business and/or assets shall assume the obligations
under this Agreement and agree expressly to perform the obligations under this Agreement in the same manner and to the same extent as
the Company would be required to perform such obligations in the absence of a succession. For all purposes under this Agreement, the
term  “Company”  shall  include  any  successor  to  the  Company’s  business  and/or  assets  which  executes  and  delivers  the  assumption
agreement  described  in  this  section  or  which  becomes  bound  by  the  terms  of  this  Agreement  by  operation  of  law.  Subject  to  the
restrictions  on  transfer  set  forth  in  this  Agreement,  this  Agreement  shall  be  binding  upon  Grantee  and  their  heirs,  executors,
administrators, successors and assigns.

E.

Assignment;  Transfers.  Except  as  set  forth  in  this  Agreement,  this  Agreement,  and  any  and  all  rights,
duties and obligations hereunder, shall not be assigned, transferred, delegated or sublicensed by the Grantee without the prior written
consent of the Company. Any attempt by the Grantee without such consent to assign, transfer, delegate or sublicense any rights, duties or
obligations  that  arise  under  this  Agreement  shall  be  void.  Except  as  set  forth  in  this  Agreement,  any  transfers  in  violation  of  any
restriction upon transfer contained in any section of this Agreement shall be void, unless such restriction is waived in accordance with
the terms of this Agreement.

F.

Waiver. Either party’s failure to enforce any provision of this Agreement shall not in any way be construed
as a waiver of any such provision, nor prevent that party from thereafter enforcing any other provision of this Agreement. The rights
granted both parties hereunder are cumulative and shall not constitute a waiver of either party’s right to assert any other legal remedy
available to it.

Grantee Investment Representations and Further Documents. The Grantee agree upon request to execute
any further documents or instruments necessary or reasonably desirable in the view of the Company to carry out the purposes or intent of
this Agreement, including (but not limited to) the applicable exhibits and attachments to this Agreement.

G.

H.

Severability.  Should  any  provision  of  this  Agreement  be  found  to  be  illegal  or  unenforceable,  the  other

provisions shall nevertheless remain effective and shall remain enforceable to the greatest extent permitted by law.

I.

Rights as Stockholder. Subject to the terms and conditions of this Agreement, Grantee shall have all of the

rights of a stockholder of the Company with respect to

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

31

the Shares from and after the date that Grantee deliver a fully executed copy of this Agreement (including the applicable exhibits and
attachments to this Agreement) and full payment for the Shares to the Company, and until such time as Grantee dispose of the Shares in
accordance with this Agreement. Upon such transfer, Grantee shall have no further rights as a holder of the Shares so purchased except
(in the case of a transfer to the Company) the right to receive payment for the Shares so purchased in accordance with the provisions of
this  Agreement,  and  Grantee  shall  forthwith  cause  the  certificate(s)  evidencing  the  Shares  so  purchased  to  be  surrendered  to  the
Company for transfer or cancellation.

Adjustment for Stock Split. All references to the number of Shares and the purchase price of the Shares in
this Agreement shall be adjusted to reflect any stock split, stock dividend or other change in the Shares which may be made after the date
of this Agreement.

J.

K.

Reliance  on  Counsel  and  Advisors.  Grantee  acknowledge  that  Latham  &  Watkins  LLP,  is  representing
only the Company in this transaction. Grantee acknowledges that he or she has had the opportunity to review this Agreement, including
all attachments hereto, and the transactions contemplated by this Agreement with his or her own legal counsel, tax advisors and other
advisors. Grantee are relying solely on his or her own counsel and advisors and not on any statements or representations of the Company
or its agents for legal or other advice with respect to this investment or the transactions contemplated by this Agreement.

Counterparts. This Agreement may be executed in one or more counterparts, each of which will be deemed
an original, but all of which together will constitute one and the same agreement. Facsimile copies of signed signature pages shall be
binding originals.

L.

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

(Signature page follows)

32

The  parties  represent  that  they  have  read  this  Agreement  in  its  entirety,  have  had  an  opportunity  to  obtain  the  advice  of  counsel
prior to executing this Agreement and fully understand this Agreement.
COMPANY:
UNITY BIOTECHNOLOGY, INC.

By:
Name:
Title:

Dr. Nathaniel E. David

President and Chief Executive Officer

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

33

 
 
 
 
The  parties  represent  that  they  have  read  this  Agreement  in  its  entirety,  have  had  an  opportunity  to  obtain  the  advice  of  counsel
prior to executing this Agreement and fully understand this Agreement. The Grantee agrees to notify the Company of any change in
its address below.
GRANTEE:
THE JOHNS HOPKINS UNIVERSITY

Name:
Title:

Address:

3400 N. Charles Street

Baltimore, Maryland, 21218-2695

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
EXHIBIT A to Stock Grant Agreement

INVESTMENT REPRESENTATION STATEMENT

GRANTEE
COMPANY
SECURITY

AMOUNT
DATE

:
:
:

:

THE JOHNS HOPKINS UNIVERSITY
UNITY BIOTECHNOLOGY, INC.
COMMON STOCK

[____] SHARES

:

[_______]

In connection with the acquisition of the above-listed shares, The Johns Hopkins University represents to the Company as follows.
For the sake of convenience of the parties, “I,” “me,” and “my” refer to The Johns Hopkins University.

1.

The Company may rely on these representations. I understand that the Company’s sale of the shares to me has not
been registered under the Securities Act of 1933, as amended (the “Securities Act”), because the Company believes, relying in part
on  my  representations  in  this  document,  that  an  exemption  from  such  registration  requirement  is  available  for  such  sale.  I
understand that the availability of this exemption depends upon the representations I am making to the Company in this document
being true and correct.
2.

I am purchasing for investment.  I  am  purchasing  the  shares  solely  for  investment  purposes,  and  not  for  further
distribution. My entire legal and beneficial ownership interest in the shares is being acquired and shall be held solely for my account,
except to the extent I intend to hold the shares jointly with my spouse. I am not a party to, and do not presently intend to enter into,
any contract or other arrangement with any other person or entity involving the resale, transfer, grant of participation with respect
to or other distribution of any of the shares. My investment intent is not limited to my present intention to hold the shares for the
minimum capital gains period specified under any applicable tax law, for a deferred sale, for a specified increase or decrease in the
market price of the shares, or for any other fixed period in the future.

3.

I can protect my own interests. I can properly evaluate the merits and risks of an investment in the shares and can
protect my own interests in this regard, whether by reason of my own business and financial expertise, the business and financial
expertise of certain professional advisors unaffiliated with the Company with whom I have consulted, or my preexisting business or
personal relationship with the Company or any of its officers, directors or controlling persons.

4.

I  am  informed  about  the  Company.  I  am  sufficiently  aware  of  the  Company’s  business  affairs  and  financial
condition  to  reach  an  informed  and  knowledgeable  decision  to  acquire  the  shares.  I  have  had  opportunity  to  discuss  the  plans,
operations  and  financial  condition  of  the  Company  with  its  officers,  directors  or  controlling  persons,  and  have  received  all
information I deem appropriate for assessing the risk of an investment in the shares.

5.

I recognize my economic risk. I realize that the acquisition of the shares involves a high degree of risk, and that the
Company’s future prospects are uncertain. I am able to hold the shares indefinitely if required, and am able to bear the loss of my
entire investment in the shares.

6.

I know that the shares are restricted securities. I understand that the shares are “restricted securities” in that the

Company’s sale of the shares to me has not been registered

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
under the Securities Act in reliance upon an exemption for non-public offerings. In this regard, I also understand and agree that:

A.

I must hold the shares indefinitely, unless any subsequent proposed resale by me is registered under the

Securities Act, or unless an exemption from registration is otherwise available (such as Rule 144);

and

B.

C.

the Company is under no obligation to register any subsequent proposed resale of the shares by me;

the certificate evidencing the shares will be imprinted with a legend which prohibits the transfer of the

shares unless such transfer is registered or such registration is not required in the opinion of counsel for the Company.

7.

I  am  familiar  with  Rule  144.  I  am  familiar  with  Rule  144  adopted  under  the  Securities  Act,  which  in  some
circumstances  permits  limited  public  resales  of  “restricted  securities”  like  the  shares  acquired  from  an  issuer  in  a  non-public
offering.  I  understand  that  my  ability  to  sell  the  shares  under  Rule  144  in  the  future  is  uncertain,  and  may  depend  upon,  among
other  things:  (i)  the  availability  of  certain  current  public  information  about  the  Company;  (ii)  the  resale  occurring  more  than  a
specified period after my acquisition and full payment (within the meaning of Rule 144) for the shares; and (iii) if I am an affiliate of
the Company (A) the sale being made in an unsolicited “broker’s transaction”, transactions directly with a market maker or riskless
principal transactions, as those terms are defined under the Securities Exchange Act of 1934, as amended, (B) the amount of shares
being sold during any three-month period not exceeding the specified limitations stated in Rule 144, and (C) timely filing of a notice
of proposed sale on Form 144, if applicable.

8.

I know that Rule 144 may never be available. I understand that the requirements of Rule 144 may never be met,
and that the shares may never be saleable under the rule. I further understand that at the time I wish to sell the shares, there may be
no public market for the Company’s stock upon which to make such a sale, or the current public information requirements of Rule
144 may not be satisfied, either of which may preclude me from selling the shares under Rule 144 even if the relevant holding period
had been satisfied.

9.

I know that I am subject to further restrictions on resale. I understand that in the event Rule 144 is not available to
me,  any  future  proposed  sale  of  any  of  the  shares  by  me  will  not  be  possible  without  prior  registration  under  the  Securities  Act,
compliance with some other registration exemption (which may or may not be available), or each of  the  following:  (i)  my  written
notice to the Company containing detailed information regarding the proposed sale, (ii) my providing an opinion of my counsel to
the effect that such sale will not require registration, and (iii) the Company notifying me in writing that its counsel concurs in such
opinion. I understand that neither the Company nor its counsel is obligated to provide me with any such opinion. I understand that
although Rule 144 is not exclusive, the Staff of the SEC has stated that persons proposing to sell private placement securities other
than in a registered offering or pursuant to Rule 144 will have a substantial burden of proof in establishing that an exemption from
registration  is  available  for  such  offers  or  sales,  and  that  such  persons  and  their  respective  brokers  who  participate  in  such
transactions do so at their own risk.

10.

I  know  that  I  may  have  tax  liability  due  to  the  uncertain  value  of  the  shares.  I  understand  that  the  Board  of
Directors  believes  its  valuation  of  the  shares  represents  a  fair  appraisal  of  their  worth,  but  that  it  remains  possible  that,  with  the
benefit of hindsight, the Internal Revenue Service may successfully assert that the value of the shares on the date of

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
my acquisition is substantially greater than the Board’s appraisal. I understand that any additional value ascribed to the shares by
such  an  IRS  determination  will  constitute  ordinary  income  to  me  as  of  the  acquisition  date,  and  that  any  additional  taxes  and
interest due as a result will be my sole responsibility payable only by me, and that the Company need not and will not reimburse me
for that tax liability.

11.

Non-U.S.  Investor.  If  I  am  not  a  United  States  person,  I  hereby  represents  that  I  am  satisfied  as  to  the  full
observance of the laws of my jurisdiction in connection with any invitation to receive the shares issuable pursuant to this Agreement,
or any use of this Agreement, including (i) the legal requirements within my jurisdiction for the acquisition of the shares pursuant to
this Agreement, (ii) any foreign exchange restrictions applicable to such receipt or transfer, (iii) any governmental or other consents
that may need to be obtained and (iv) the income tax and other tax consequences, if any, that may be relevant to the acquisition,
holding, redemption, sale or transfer of such securities. My subscription for, and my continued beneficial ownership of the shares
will not violate any applicable securities or other laws of my jurisdiction.

12.

Principal Place of Business. The address of a principal place of business of The Johns Hopkins University is set

forth on the signature page below.
By  signing  below,  the  undersigned  acknowledge  their  agreement  with  each  of  the  statements  contained  in  this  Investment
Representation Statement as of the date first set forth above, and their intent for the Company to rely on such statements in issuing
the shares to me.

THE JOHNS HOPKINS UNIVERSITY

By:

Name:

Title:

Address of Grantee Principal Place of Business:

3400 N. Charles Street

Baltimore, Maryland, 21218-2695

***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
 
 
 
 
 
Certificate Of Completion

Envelope Id: 269313340F904A57A30CEB4D2A41F5C6

Subject: Please DocuSign: A30652 JHU LIcense Agreement (final) VT1.pdf

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Johns Hopkins University – Technology Ventures

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Nathaniel David

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***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
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***Certain information contained herein has been omitted pursuant to Regulation S-K 601(b)(10).
Confidential treatment has been granted with respect to the omitted portions.

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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TRANSITION AND SEPARATION AGREEMENT

Exhibit 10.38

ition and Separation Agreement (the “Agreement”) by and between Nathaniel David (“Executive”) and Unity Biotechnology, Inc., a Delaware corporation

(the “Company”), is made effective as of the date Executive signs this Agreement (the “Effective Date”) with reference to the following facts:

defined below).

A.

B.

Executive’s employment with the Company and each of its affiliates will end effective upon the Termination Date (as

Executive and the Company want to end their relationship amicably and establish the obligations of the parties

including, without limitation, all amounts due and owing to the Executive.

EREFORE, in consideration of the mutual covenants and agreements hereinafter set forth, the parties agree as follows:

1.

Termination Date.  Executive acknowledges and agrees that Executive’s status as an employee and an officer of the

Company shall end effective as of the earliest of (a) December 31, 2020 (the “Planned Termination Date”), (b) the date Executive takes any action
that constitutes Cause (as defined in that certain Employment Agreement by and between Executive and the Company dated as of January 29, 2018,
as amended March 9, 2020 (the “Employment Agreement”)) or (c) the date Executive voluntarily resigns Executive’s employment with the Company
(the earliest such date, the “Termination Date”).  For the avoidance of doubt, in the event the Company terminates Executive’s employment for other
than Cause, then Executive shall continue to be paid as though Executive continued employment through the Planned Termination Date and, subject
to the terms and conditions of Section 5, shall be entitled to the Separation Payments and Benefits described in Section 5.  Executive hereby agrees to
execute such further document(s) as shall be determined by the Company as necessary or desirable to give effect to the termination of Executive’s
status as an officer of the Company.  

2.

Continued Employment.

(a)

Employment Period.  From the Effective Date through the Termination Date (the “Employment Period”),

Executive shall remain employed by the Company as the Company’s President and shall continue to serve as a member of the Board of
Directors of the Company (the “Board”).    

(b)

Salary and Benefits Continuation.  During the Employment Period, Executive will continue to be paid
base salary at the rate in effect on the Effective Date, accrue paid vacation, be eligible for all employee benefit plans available to senior
executives of the Company and continue to vest into outstanding equity awards in accordance with their terms.  All payments made to
Executive during the Employment Period will be subject to required withholding taxes and authorized deductions.  

(c)

Equity Awards.  Absent any agreement between Executive and the Company to the contrary that is entered
into on or prior the Termination Date, effective as of the Termination Date, Executive’s equity awards in the Company that are outstanding
as of immediately prior to the Termination Date (collectively, the “Equity Awards”) shall cease vesting and any unvested shares subject
thereto shall be forfeited and shall cease to be outstanding without any further action by the Company or Executive.

1

 
 
 
 
 
 
 
(d)

Protection of Information.  Executive agrees that, during the Employment Period and thereafter, Executive

will not, except for the purposes of performing Executive’s duties during the Employment Period, seek to obtain any confidential or
proprietary information or materials of the Company.

of the Company’s Board of Directors (the “Board”).  

3.

Continued Board Service.  Following the Planned Termination Date, Executive shall continue to serve as a member

4.

Final Paycheck; Payment of Accrued Wages and Expenses.  As soon as administratively practicable on or after the

Termination Date, the Company will pay Executive all accrued but unpaid base salary and all accrued and unused vacation earned through the
Termination Date, subject to standard payroll deductions and withholdings.  The Company will also reimburse Executive for all outstanding expenses
incurred prior to the Termination Date which are consistent with the Company’s policies in effect from time to time with respect to travel,
entertainment and other business expenses, subject to the Company’s requirements with respect to reporting and documenting such
expenses.  Executive is entitled to these payments regardless of whether Executive executes this Agreement or a Release of Claims (as defined
below).

5.

Separation Payments and Benefits.  Without admission of any liability, fact or claim, the Company hereby agrees,

subject to: (i) the execution of this Agreement, (ii) the delivery to the Company of a copy of the General Release of Claims attached hereto as Exhibit
A (the “Release of Claims”) signed on or after the Planned Termination Date that becomes effective and irrevocable within sixty (60) days following
the Planned Termination Date, (iii) Executive remaining employed hereunder through the Planned Termination Date and (iv) Executive’s continued
compliance with the terms and conditions of the At-Will Employment, Confidential Information, Invention and Assignment, and Arbitration
Agreement by and between Executive and the Company dated as of August 24, 2016 (the “Confidentiality Agreement”), to provide Executive the
severance benefits set forth below.  For the avoidance of doubt, in the event the Company terminates Executive’s employment for other than Cause
before the Planned Termination Date, then Executive shall be deemed to have continued employment through the Planned Termination Date and
remain eligible for the Separation Payments and Benefits described in this Section 5, subject to the other terms and conditions set forth in the
preceding sentence. Specifically, in the event the terms and conditions of this Section 5 are satisfied, the Company and Executive agree as follows:

(a)

Base Salary Severance.  Executive shall be entitled to receive an amount equal to $345,937.50, less

applicable withholdings and deductions, which represents nine months of Executive’s base salary at the rate in effect on the Effective Date,
less applicable withholdings and deductions, on the Company’s first payroll date following the date the Release of Claims becomes
effective and irrevocable.  

(b)

2020 Bonus.  Executive shall be entitled to receive an amount equal to the annual bonus Executive

otherwise would have received for fiscal year 2020, if any, determined based on the actual performance of the Company, payable in a cash
lump sum, less applicable withholdings and deductions, on the date that annual bonuses for fiscal year 2020 are paid to other executives of
the Company, but in no event later than March 15, 2021.

(c)

Healthcare Continuation Coverage.  If Executive elects to receive continued healthcare coverage pursuant

to the provisions of the Consolidated Omnibus Budget Reconciliation Act of 1985, as amended (“COBRA”), the Company shall directly
pay, or reimburse Executive for, the premiums for Executive and Executive’s covered dependents at the same levels in effect on the
Termination Date during the period commencing on the Termination Date and ending on the earlier to occur of (i) the nine

2

 
month anniversary of the Termination Date and (ii) the date Executive becomes eligible for comparable coverage under another employer’s
plans, provided, however that if (1) any plan pursuant to which such benefits are provided is not, or ceases prior to the expiration of the
continuation coverage period to be, exempt from the application of Section 409A under Treasury Regulation Section 1.409A-1(a)(5), (2)
the Company is otherwise unable to continue to cover Executive or Executive’s dependents under its group health plans, or (3) the
Company cannot provide the benefit without violating applicable law (including, without limitation, Section 2716 of the Public Health
Service Act), then, in any such case, an amount equal to each remaining Company subsidy shall thereafter be paid to Executive in
substantially equal monthly installments over the remaining continuation coverage period.  After the Company ceases to pay premiums
pursuant to the preceding sentence, Executive may, if eligible, elect to continue healthcare coverage at Executive’s expense in accordance
with the provisions of COBRA.  Executive acknowledges that Executive shall be solely responsible for all matters relating to Executive’s
continuation of coverage pursuant to COBRA, including, without limitation, Executive’s election of such coverage and Executive’s timely
payment of premiums.

(d)

Taxes.  Executive understands and agrees that all payments under this Agreement will be subject to
appropriate tax withholding and other deductions.  To the extent any taxes may be payable by Executive for the benefits provided to
Executive by this Agreement beyond those withheld by the Company, Executive agrees to pay them and to indemnify and hold the
Company and the other entities released herein harmless for any tax claims or penalties, and associated attorneys’ fees and costs, resulting
from any failure by Executive to make required payments.

(e)

Sole Separation Benefit.  Executive agrees that the payments and benefits provided by this Section 5 are

not required under the Company’s normal policies and procedures and are provided as a severance solely in connection with this
Agreement.  Executive acknowledges and agrees that the payments and benefits referenced in this Section 5 constitute adequate and
valuable consideration, in and of themselves, for the promises contained in this Agreement.

6.

Full Payment.  Executive acknowledges that the payment and arrangements herein shall constitute full and

complete satisfaction of any and all amounts properly due and owing to Executive as a result of Executive’s employment with the Company and the
termination thereof.  Executive further acknowledges that, other than the Confidentiality Agreement and the agreements evidencing the Equity
Awards, this Agreement shall supersede each agreement entered into between Executive and the Company regarding Executive’s employment,
including, without limitation, the Employment Agreement, any other offer letter, employment agreement, severance and/or change in control
agreement, and each such agreement shall be deemed terminated and of no further effect as of the Effective Date.

7.

Executive’s Release of the Company.  Executive understands that by agreeing to the release provided by this

Section 7, Executive is agreeing not to sue, or otherwise file any claim against, the Company or any of its directors, officers, employees, investors or
other agents for any reason whatsoever based on anything that has occurred as of the date Executive signs this Agreement.

(a)

On behalf of Executive and Executive’s heirs, assigns, executors, administrators, trusts, spouse and estate,
Executive hereby releases and forever discharges the “Releasees” hereunder, consisting of the Company, and each of its owners, affiliates,
subsidiaries, predecessors, successors, assigns, agents, directors, officers, partners, employees, and insurers, and all persons acting by,
through, under or in concert with them, or

3

 
any of them, of and from any and all manner of action or actions, cause or causes of action, in law or in equity, suits, debts, liens, contracts,
agreements, promises, liability, claims, demands, damages, loss, cost or expense, of any nature whatsoever, known or unknown, fixed or
contingent (hereinafter called “Claims”), which Executive now has or may hereafter have against the Releasees, or any of them, by reason
of any matter, cause, or thing whatsoever from the beginning of time to the date hereof, including, without limiting the generality of the
foregoing, any Claims arising out of, based upon, or relating to Executive’s hire, employment, remuneration or resignation by the
Releasees, or any of them, Claims arising under federal, state, or local laws relating to employment, Claims of any kind that may be
brought in any court or administrative agency, including any Claims arising under Title VII of the Civil Rights Act of 1964, as amended, 42
U.S.C. §  2000, et seq.; Americans with Disabilities Act, as amended, 42 U.S.C. § 12101 et seq.; the Rehabilitation Act of 1973, as
amended, 29 U.S.C. § 701 et seq.; Civil Rights Act of 1866, and Civil Rights Act of 1991; 42 U.S.C. § 1981, et seq.; Equal Pay Act, as
amended, 29 U.S.C. § 206(d); regulations of the Office of Federal Contract Compliance, 41 C.F.R. Section 60, et seq.; the Family and
Medical Leave Act, as amended, 29 U.S.C. § 2601 et seq.; the Fair Labor Standards Act of 1938, as amended, 29 U.S.C. § 201 et seq.; the
Executive Retirement Income Security Act, as amended, 29 U.S.C. § 1001 et seq.; the Worker Adjustment and Retraining Notification Act,
as amended, 29 U.S.C.  § 2101 et seq.; the California Fair Employment and Housing Act, as amended, Cal. Lab. Code § 12940 et seq.; the
California Equal Pay Law, as amended, Cal. Lab. Code §§ 1197.5(a),199.5; the Moore-Brown-Roberti Family Rights Act of 1991, as
amended, Cal. Gov’t Code §§12945.2, 19702.3; California Labor Code §§ 1101, 1102; the California WARN Act, California Labor Code
§§ 1400 et. seq.; and California Labor Code §§ 1102.5(a),(b), Claims for wages under the California Labor Code and any other federal,
state or local laws of similar effect, Claims under the employment and civil rights laws of California, Claims for breach of contract, Claims
arising in tort, including, without limitation, Claims of wrongful dismissal or discharge, discrimination, harassment, retaliation, fraud,
misrepresentation, defamation, libel, infliction of emotional distress, violation of public policy, and/or breach of the implied covenant of
good faith and fair dealing, and Claims for damages or other remedies of any sort, including, without limitation, compensatory damages,
punitive damages, injunctive relief and attorney’s fees.  

(b)

Notwithstanding the generality of the foregoing, Executive does not release the following claims:

(i)

(ii)

terms of applicable state law;

Claims under this Agreement;

Claims for unemployment compensation or any state disability insurance benefits pursuant to the

compensation insurance policy or fund of the Company;

(iii)

Claims  for  workers’  compensation  insurance  benefits  under  the  terms  of  any  worker’s

terms and conditions of COBRA;

(iv)

Claims to continued participation in certain of the Company’s group benefit plans pursuant to the

any Company employee benefit plan;

(v)

Claims to any benefit entitlements vested as the Termination Date, pursuant to written terms of

Company’s Bylaws, California Labor Code Section 2802 or any other applicable law; and

(vi)

Claims for indemnification under Executive’s indemnification agreement with the Company, the

4

 
Executive’s  right  to  bring  to  the  attention  of  the  Equal  Employment  Opportunity  Commission
claims  of  discrimination;  provided,  however,  that  Executive  does  release  Executive’s  right  to  secure  any  damages  for  alleged
discriminatory treatment.

(vii)

WITH THE PROVISIONS OF CALIFORNIA CIVIL CODE SECTION 1542, WHICH PROVIDES AS FOLLOWS:

(c)

EXECUTIVE ACKNOWLEDGES THAT EXECUTIVE HAS BEEN ADVISED OF AND IS FAMILIAR

“A  GENERAL  RELEASE  DOES  NOT  EXTEND  TO  CLAIMS  THAT  THE  CREDITOR  OR  RELEASING  PARTY  DOES  NOT
KNOW  OR  SUSPECT  TO  EXIST  IN  HIS  OR  HER  FAVOR  AT  THE  TIME  OF  EXECUTING  THE  RELEASE  AND  THAT,  IF
KNOWN BY HIM OR HER, WOULD HAVE MATERIALLY AFFECTED HIS OR HER SETTLEMENT WITH THE DEBTOR
OR RELEASED PARTY.”

BEING AWARE OF SAID CODE SECTION, EXECUTIVE HEREBY EXPRESSLY WAIVES ANY RIGHTS EXECUTIVE MAY HAVE
THEREUNDER, AS WELL AS UNDER ANY OTHER STATUTES OR COMMON LAW PRINCIPLES OF SIMILAR EFFECT.

8.

Executive Representations.  Executive warrants and represents that (a) Executive has not filed or authorized the

filing of any complaints, charges or lawsuits against the Company or any affiliate of the Company with any governmental agency or court, and that if,
unbeknownst to Executive, such a complaint, charge or lawsuit has been filed on Executive’s behalf, Executive will immediately cause it to be
withdrawn and dismissed, (b) Executive has reported all hours worked as of the date of this Agreement and has been paid all compensation, wages,
bonuses, commissions, and/or benefits to which Executive may be entitled and which are due through the date of this Agreement and no other
compensation, wages, bonuses, commissions and/or benefits are due to Executive, except as provided in this Agreement, (c) Executive has no known
workplace injuries or occupational diseases and has been provided and/or has not been denied any leave requested under the Family and Medical
Leave Act or any similar state law, (d) the execution, delivery and performance of this Agreement by Executive does not and will not conflict with,
breach, violate or cause a default under any agreement, contract or instrument to which Executive is a party or any judgment, order or decree to
which Executive is subject, and (e) upon the execution and delivery of this Agreement by the Company and Executive, this Agreement will be a valid
and binding obligation of Executive, enforceable in accordance with its terms.  

9.

No Assignment by Executive.  Executive warrants and represents that no portion of any of the matters released

herein, and no portion of any recovery or settlement to which Executive might be entitled, has been assigned or transferred to any other person, firm
or corporation not a party to this Agreement, in any manner, including by way of subrogation or operation of law or otherwise.  If any claim, action,
demand or suit should be made or instituted against the Company or any other Releasee because of any actual assignment, subrogation or transfer by
Executive, Executive agrees to indemnify and hold harmless the Company and all other Releasees against such claim, action, suit or demand,
including necessary expenses of investigation, attorneys’ fees and costs.  In the event of Executive’s death, this Agreement shall inure to the benefit
of Executive and Executive’s executors, administrators, heirs, distributees, devisees, and legatees.  None of Executive’s rights or obligations may be
assigned or transferred by Executive, other than Executive’s rights to payments hereunder, which may be transferred only upon Executive’s death by
will or operation of law.  

shall be governed by, the laws of the State of

10.

Governing Law.  This Agreement shall be construed and enforced in accordance with, and the rights of the parties

5

 
California or, where applicable, United States federal law, in each case, without regard to any conflicts of laws provisions or those of any state other
than California.

11.

Miscellaneous.  This Agreement, collectively with the Confidentiality Agreement, the indemnification agreement

between Executive and the Company and the agreements evidencing the Equity Awards, comprises the entire agreement between the parties with
regard to the subject matter hereof and supersedes, in their entirety, any other agreements between Executive and the Company with regard to the
subject matter hereof, including without limitation, the Employment Agreement.  The Company and Executive acknowledge that the termination of
the Executive’s employment with the Company is intended to constitute a separation from service for the purposes of Section 409A of the Code, and
the related Department of Treasury regulations.  Executive acknowledges that there are no other agreements, written, oral or implied, and that
Executive may not rely on any prior negotiations, discussions, representations or agreements.  This Agreement may be modified only in writing, and
such writing must be signed by both parties and recited that it is intended to modify this Agreement.  This Agreement may be executed in separate
counterparts, each of which is deemed to be an original and all of which taken together constitute one and the same agreement.  

12.

Company Assignment and Successors.  The Company shall assign its rights and obligations under this Agreement

to any successor to all or substantially all of the business or the assets of the Company (by merger or otherwise).  This Agreement shall be binding
upon and inure to the benefit of the Company and its successors, assigns, personnel and legal representatives.    

13.

Maintaining Confidential Information; Whistleblower Protection.  Executive acknowledges and agrees that the

payments and benefits provided in Section 5 above shall be subject to Executive’s continued compliance with Executive’s obligations under the
Confidentiality Agreement.  For the avoidance of doubt, nothing in the Confidentiality Agreement or this Agreement will be construed to prohibit
Executive from filing a charge with, reporting possible violations to, or participating or cooperating with any governmental agency or entity,
including but not limited to the EEOC, the Department of Justice, the Securities and Exchange Commission, Congress, or any agency Inspector
General, or making other disclosures that are protected under the whistleblower, anti-discrimination, or anti-retaliation provisions of federal, state or
local law or regulation.  Executive does not need the prior authorization of the Company to make any such reports or disclosures, and Executive is
not required to notify the Company that Executive has made such reports or disclosures.  Furthermore, in accordance with 18 U.S.C. § 1833,
notwithstanding anything to the contrary in the Confidentiality Agreement or this Agreement: (i) Executive shall not be in breach of the
Confidentiality Agreement or this Agreement, and shall not be held criminally or civilly liable under any federal or state trade secret law (x) for the
disclosure of a trade secret that is made in confidence to a federal, state, or local government official or to an attorney solely for the purpose of
reporting or investigating a suspected violation of law, or (y) for the disclosure of a trade secret that is made in a complaint or other document filed in
a lawsuit or other proceeding, if such filing is made under seal; and (ii) if Executive files a lawsuit for retaliation by the Company for reporting a
suspected violation of law, Executive may disclose the trade secret to Executive’s attorney, and may use the trade secret information in the court
proceeding, if Executive files any document containing the trade secret under seal, and does not disclose the trade secret, except pursuant to court
order.

14.

Executive’s Cooperation.  After the Termination Date, Executive shall cooperate with the Company and its

affiliates, upon the Company’s reasonable request, with respect to any internal investigation or administrative, regulatory or judicial proceeding
involving matters within the scope of Executive’s duties and responsibilities to the Company or its affiliates during Executive’s employment with the
Company (including, without limitation, Executive being

6

 
available to the Company upon reasonable notice for interviews and factual investigations, appearing at the Company’s reasonable request to give
testimony without requiring service of a subpoena or other legal process, and turning over to the Company all relevant Company documents which
are or may have come into Executive’s possession during Executive’s employment); provided, however, that any such request by the Company shall
not be unduly burdensome or interfere with Executive’s personal schedule or ability to engage in gainful employment.   

(Signature page(s) follow)

7

 
 
ESS WHEREOF, the undersigned have caused this Transition and Separation Agreement to be duly executed and delivered as of the date indicated next to

their respective signatures below.

DATED: December 12, 2020

DATED: December 12, 2020

/s/ Nathaniel David
Nathaniel David

UNITY BIOTECHNOLOGY, INC.

/s/ Anirvan Ghosh

By:
Name:  Anirvan Ghosh
Title:  CEO

[Signature page to Transition and Separation Agreement]

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
EXHIBIT A

GENERAL RELEASE OF CLAIMS

ral Release of Claims (“Release”) is entered into as of December 31, 2020 between Nathaniel David (“Executive”) and Unity Biotechnology, Inc., a

Delaware corporation (the “Company”) (together referred to herein as the “Parties”), effective eight days after Executive’s signature hereto (the “Effective
Date”), unless Executive revokes Executive’s acceptance of this Release as provided in Paragraph 1(c), below.

1.

Executive’s Release of the Company.  Executive understands that by agreeing to this Release, Executive is agreeing

not to sue, or otherwise file any claim against, the Company or any of its directors, officers, employees, investors or other agents for any reason
whatsoever based on anything that has occurred as of the date Executive signs this Release.

(a)

Released Claims.  On behalf of Executive and Executive’s heirs, assigns, executors, administrators, trusts,
spouse and estate, Executive hereby releases and forever discharges the “Releasees” hereunder, consisting of the Company, and each of its
owners, affiliates, subsidiaries, predecessors, successors, assigns, agents, directors, officers, partners, employees, and insurers, and all
persons acting by, through, under or in concert with them, or any of them, of and from any and all manner of action or actions, cause or
causes of action, in law or in equity, suits, debts, liens, contracts, agreements, promises, liability, claims, demands, damages, loss, cost or
expense, of any nature whatsoever, known or unknown, fixed or contingent (hereinafter called “Claims”), which Executive now has or may
hereafter have against the Releasees, or any of them, by reason of any matter, cause, or thing whatsoever from the beginning of time to the
date hereof, including, without limiting the generality of the foregoing, any Claims arising out of, based upon, or relating to Executive’s
hire, employment, remuneration or resignation by the Releasees, or any of them, Claims arising under federal, state, or local laws relating to
employment, Claims of any kind that may be brought in any court or administrative agency, including any Claims arising under Title VII of
the Civil Rights Act of 1964, as amended, 42 U.S.C. §  2000, et seq.; Americans with Disabilities Act, as amended, 42 U.S.C. § 12101 et
seq.; the Rehabilitation Act of 1973, as amended, 29 U.S.C. § 701 et seq.; Age Discrimination in Employment Act, as amended, 29 U.S.C.
§ 621, et seq. (the “ADEA”); Civil Rights Act of 1866, and Civil Rights Act of 1991; 42 U.S.C. § 1981, et seq.; Equal Pay Act, as
amended, 29 U.S.C. § 206(d); regulations of the Office of Federal Contract Compliance, 41 C.F.R. Section 60, et seq.; the Family and
Medical Leave Act, as amended, 29 U.S.C. § 2601 et seq.; the Fair Labor Standards Act of 1938, as amended, 29 U.S.C. § 201 et seq.; the
Executive Retirement Income Security Act, as amended, 29 U.S.C. § 1001 et seq.; the Worker Adjustment and Retraining Notification Act,
as amended, 29 U.S.C.  § 2101 et seq.; the California Fair Employment and Housing Act, as amended, Cal. Lab. Code § 12940 et seq.; the
California Equal Pay Law, as amended, Cal. Lab. Code §§ 1197.5(a),199.5; the Moore-Brown-Roberti Family Rights Act of 1991, as
amended, Cal. Gov’t Code §§12945.2, 19702.3; California Labor Code §§ 1101, 1102; the California WARN Act, California Labor Code
§§ 1400 et. seq.; and California Labor Code §§ 1102.5(a),(b), Claims for wages under the California Labor Code and any other federal,
state or local laws of similar effect, Claims under the employment and civil rights laws of California, Claims for breach of contract, Claims
arising in tort, including, without limitation, Claims of wrongful dismissal or discharge, discrimination, harassment, retaliation, fraud,
misrepresentation, defamation, libel, infliction of emotional distress, violation of public policy, and/or breach of the implied covenant of
good faith and fair dealing, and Claims for damages or other remedies of any sort, including,

A-1

 
 
 
 
 
 
 
without limitation, compensatory damages, punitive damages, injunctive relief and attorney’s fees.  

following claims:

(b)

Unreleased Claims.  Notwithstanding the generality of the foregoing, Executive does not release the

of December 12, 2020 (the “Transition and Separation Agreement”);

(i)

Claims under that certain Transition and Separation Agreement entered into between the Parties as

terms of applicable state law;

(ii)

Claims for unemployment compensation or any state disability insurance benefits pursuant to the

compensation insurance policy or fund of the Company;

(iii)

Claims  for  workers’  compensation  insurance  benefits  under  the  terms  of  any  worker’s

terms and conditions of COBRA;

(iv)

Claims to continued participation in certain of the Company’s group benefit plans pursuant to the

and Separation Agreement), pursuant to written terms of any Company employee benefit plan;

(v)

Claims  to  any  benefit  entitlements  vested  as  the  Termination  Date  (as  defined  in  the  Transition

Company, the Company’s Bylaws, California Labor Code Section 2802 or any other applicable law; and

(vi)

Claims  for  indemnification  under  the  indemnification  agreement  between  Executive  and  the

(vii)

Executive’s right to bring to the attention of the Equal Employment Opportunity Commission

claims of discrimination; provided, however, that Executive does release Executive’s right to secure any damages for alleged
discriminatory treatment.

(c)

Acknowledgement.    Executive  acknowledges  that  Executive  is  knowingly  and  voluntarily  waiving  and
releasing  any  rights  Executive  may  have  under  the  ADEA.    Executive  also  acknowledges  that  the  consideration  given  for  the  waiver  and
release herein is in addition to anything of value to which Executive was already entitled.  Executive further acknowledges that Executive has
been advised by this writing, as required by the ADEA, that:

execution date of this Agreement;

(i)

Executive’s waiver and release do not apply to any rights or claims that may arise after the

to executing this Agreement;

(ii)

Executive has been advised hereby that Executive has the right to consult with an attorney prior

(iii)
to voluntarily execute this Agreement earlier);

Executive has twenty-one (21) days to execute this Agreement (although Executive may choose

(iv)

Executive has seven (7) days following the execution of this Agreement by Executive to revoke

the Agreement. If Executive wishes to revoke this Agreement, Executive must deliver notice of Executive’s revocation in writing,
no

A-2

 
 
 
later than 5:00 p.m. Pacific Time on the 7th day following Executive’s execution of this Agreement to
legal@unitybiotechnology.com. Executive understands that if Executive revokes this Agreement, it will be null and void in its
entirety, and Executive will not be entitled to any payments or benefits provided by Section 5 of the Transition and Separation
Agreement unless and until such seven (7) day period has expired;

which will be the eighth (8th) day after this Agreement is executed by Executive; and

(v)

this Agreement will not be effective until the date upon which the revocation period has expired,

this Agreement.  

(vi)

this Agreement does not affect Executive’s ability to test the knowing and voluntary nature of

WITH THE PROVISIONS OF CALIFORNIA CIVIL CODE SECTION 1542, WHICH PROVIDES AS FOLLOWS:

(d)

EXECUTIVE ACKNOWLEDGES THAT EXECUTIVE HAS BEEN ADVISED OF AND IS FAMILIAR

“A  GENERAL  RELEASE  DOES  NOT  EXTEND  TO  CLAIMS  THAT  THE  CREDITOR  OR  RELEASING  PARTY  DOES  NOT
KNOW  OR  SUSPECT  TO  EXIST  IN  HIS  OR  HER  FAVOR  AT  THE  TIME  OF  EXECUTING  THE  RELEASE  AND  THAT,  IF
KNOWN BY HIM OR HER, WOULD HAVE MATERIALLY AFFECTED HIS OR HER SETTLEMENT WITH THE DEBTOR
OR RELEASED PARTY.”

BEING AWARE OF SAID CODE SECTION, EXECUTIVE HEREBY EXPRESSLY WAIVES ANY RIGHTS EXECUTIVE MAY HAVE
THEREUNDER, AS WELL AS UNDER ANY OTHER STATUTES OR COMMON LAW PRINCIPLES OF SIMILAR EFFECT.

2.

Executive Representations.  Executive warrants and represents that (a) Executive has not filed or authorized the

filing of any complaints, charges or lawsuits against the Company or any of its affiliates with any governmental agency or court, and that if,
unbeknownst to Executive, such a complaint, charge or lawsuit has been filed on Executive’s behalf, Executive will immediately cause it to be
withdrawn and dismissed, (b) Executive has reported all hours worked as of the date of this Release and has been paid all compensation, wages,
bonuses, commissions, and/or benefits to which Executive may be entitled and no other compensation, wages, bonuses, commissions and/or benefits
are due to Executive, except as provided in Section 5 of the Transition and Separation Agreement, (c) Executive has no known workplace injuries or
occupational diseases and has been provided and/or has not been denied any leave requested under the Family and Medical Leave Act or any similar
state law, (d) the execution, delivery and performance of this Release by Executive does not and will not conflict with, breach, violate or cause a
default under any agreement, contract or instrument to which Executive is a party or any judgment, order or decree to which Executive is subject, and
(e) upon the execution and delivery of this Release by the Company and Executive, this Release will be a valid and binding obligation of Executive,
enforceable in accordance with its terms.

3.

Maintaining Confidential Information.  Executive reaffirms Executive’s obligations under the Confidentiality

Agreement (within the meaning of the Transition and Separation Agreement).  Executive acknowledges and agrees that the payments provided in
Section 5 of the Transition and Separation Agreement shall be subject to Executive’s continued compliance with Executive’s obligations under the
Confidentiality Agreement.  For the avoidance of doubt, nothing in the Confidentiality Agreement, the Transition and Separation Agreement or this
Release

A-3

 
 
 
will be construed to prohibit Executive from filing a charge with, reporting possible violations to, or participating or cooperating with any
governmental agency or entity, including but not limited to the EEOC, the Department of Justice, the Securities and Exchange Commission,
Congress, or any agency Inspector General, or making other disclosures that are protected under the whistleblower, anti-discrimination, or anti-
retaliation provisions of federal, state or local law or regulation.  Executive does not need the prior authorization of the Company to make any such
reports or disclosures, and Executive is not required to notify the Company that Executive has made such reports or disclosures.  Furthermore, in
accordance with 18 U.S.C. § 1833, notwithstanding anything to the contrary in the Confidentiality Agreement, the Transition and Separation
Agreement or this Release: (i) Executive shall not be in breach of the Confidentiality Agreement, the Transition and Separation Agreement or this
Release, and shall not be held criminally or civilly liable under any federal or state trade secret law (x) for the disclosure of a trade secret that is made
in confidence to a federal, state, or local government official or to an attorney solely for the purpose of reporting or investigating a suspected
violation of law, or (y) for the disclosure of a trade secret that is made in a complaint or other document filed in a lawsuit or other proceeding, if such
filing is made under seal; and (ii) if Executive files a lawsuit for retaliation by the Company for reporting a suspected violation of law, Executive may
disclose the trade secret to Executive’s attorney, and may use the trade secret information in the court proceeding, if Executive files any document
containing the trade secret under seal, and does not disclose the trade secret, except pursuant to court order.

pursuant to Section 14 of the Transition and Separation Agreement.  

4.

Cooperation With the Company.  Executive reaffirms Executive’s obligations to cooperate with the Company

it shall not affect the validity or enforceability of any other provision.

5.

Severability.  The provisions of this Release are severable.  If any provision is held to be invalid or unenforceable,

State of California, including all matters of construction, validity and performance, without regard to conflicts of law principles.

6.

Choice of Law.  This Release shall in all respects be governed and construed in accordance with the laws of the

7.

Integration Clause.  This Release and the Transition and Separation Agreement, collectively with the

Confidentiality Agreement, the indemnification agreement between Executive and the Company and the agreements evidencing the Equity Awards,
contain the Parties’ entire agreement with regard to the transition and separation of Executive’s employment, and supersede and replace any prior
agreements as to those matters, whether oral or written. This Release may not be changed or modified, in whole or in part, except by an instrument in
writing signed by Executive and the Chief Executive Officer of the Company.

though executed in a single document.  Facsimile or electronic signatures shall have the same force and effectiveness as original signatures.

8.

Execution in Counterparts.  This Release may be executed in counterparts with the same force and effectiveness as

terms and provisions; and intend and agree that it is final and binding on all Parties.

9.

Intent to be Bound.  The Parties have carefully read this Release in its entirety; fully understand and agree to its

A-4

 
 
 
 
ESS WHEREOF, the undersigned have caused this General Release of Claims to be duly executed and delivered as of the date indicated next to their

respective signatures below.

DATED: December 31, 2020

DATED: December 31, 2020

Nathaniel David

UNITY BIOTECHNOLOGY, INC.

By:  __________________________
Name: Anirvan Ghosh
Title: CEO

A-5

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Exhibit 23.1

We consent to the incorporation by reference in the following Registration Statements:

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

(1)

(2)

(3)

(4)

(5)

(6)

Registration Statement (Form S-3 No. 333-231893) and related Prospectus of Unity Biotechnology, Inc.,

Registration Statement (Form S-8 No. 333-224726) pertaining to the 2013 Equity Incentive Plan, the 2018 Incentive Award Plan and, 2018 Employee Stock
Purchase Plan of Unity Biotechnology, Inc.,

Registration Statement (Form S-8 No. 333-230086) pertaining to the 2018 Incentive Award Plan and 2018 Employee Stock Purchase Plan of Unity
Biotechnology, Inc.,

Registration Statement (Form S-8 No. 333- 237088) pertaining to the 2018 Incentive Award Plan and 2018 Employee Stock Purchase Plan of Unity
Biotechnology, Inc.,

Registration Statement (Form S-8 No. 333-237474) pertaining to the 2020 Employment Inducement Incentive Plan of Unity Biotechnology, Inc., and

Registration Statement (Form S-8 No. 333- 250926) pertaining to the 2020 Employment Inducement Incentive Award Plan, as amended of Unity
Biotechnology, Inc.;

of our report dated March 23, 2021, with respect to the financial statements of Unity Biotechnology, Inc. included in this Annual Report (Form 10-K) of Unity
Biotechnology, Inc. for the year ended December 31, 2020.

/s/ Ernst & Young LLP

Redwood City, California
March 23, 2021

 
 
 
 
 
 
 
 
 
 
 
 
Exhibit 31.1

CERTIFICATION PURSUANT TO
RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,
AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Anirvan Ghosh, certify that:

1.

2.

3.

4.

I have reviewed this Annual Report on Form 10-K of Unity Biotechnology, Inc. for the year ended December 31, 2020;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements
made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial
condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act
Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and
have:

(a)

(b)

(c)

(d)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that
material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly
during the period in which this report is being prepared;

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to
provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in
accordance with generally accepted accounting principles;

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the
disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal
quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the
registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's
auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

(b)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to
adversely affect the registrant's ability to record, process, summarize and report financial information; and

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over
financial reporting.

Date: March 23, 2021

  By:

/s/ Anirvan Ghosh
Anirvan Ghosh, Ph.D.
Chief Executive Officer
(Principal Executive Officer)

 
 
 
 
 
 
 
 
 
   
 
   
 
 
Exhibit 31.2

CERTIFICATION PURSUANT TO
RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,
AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, Lynne Sullivan, certify that:

1.

2.

3.

4.

I have reviewed this Annual Report on Form 10-K of Unity Biotechnology, Inc. for the year ended December 31, 2020;

Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements
made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial
condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

The registrant's other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act
Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and
have:

(a)

(b)

(c)

(d)

Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that
material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly
during the period in which this report is being prepared;

Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to
provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in
accordance with generally accepted accounting principles;

Evaluated the effectiveness of the registrant's disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the
disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

Disclosed in this report any change in the registrant's internal control over financial reporting that occurred during the registrant's most recent fiscal
quarter (the registrant's fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the
registrant's internal control over financial reporting; and

5.

The registrant's other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant's
auditors and the audit committee of the registrant's board of directors (or persons performing the equivalent functions):

(a)

(b)

All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to
adversely affect the registrant's ability to record, process, summarize and report financial information; and

Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant's internal control over
financial reporting.

Date: March 23, 2021

  By:

/s/ Lynne Sullivan
Lynne Sullivan
Chief Financial Officer
(Principal Financial and Accounting Officer)

 
 
 
 
 
 
 
 
 
   
 
   
 
 
CERTIFICATION PURSUANT TO
18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO
SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

Exhibit 32.1

In connection with the Annual Report of Unity Biotechnology, Inc. (the “Company”) on Form 10-K for the year ending December 31, 2020 as filed with the

Securities and Exchange Commission on the date hereof (the “Report”), I, Anirvan Ghosh, Chief Executive Officer of the Company, and Lynne Sullivan, Chief Financial
Officer of the Company, do each hereby certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

(1)

(2)

The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

Date: March 23, 2021

Date: March 23, 2021

  By:

  By:

/s/ Anirvan Ghosh
Anirvan Ghosh, Ph.D.
Chief Executive Officer
(Principal Executive Officer)

/s/ Lynne Sullivan
Lynne Sullivan
Chief Financial Officer
(Principal Financial and Accounting Officer)