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Rexahn Pharmaceuticals, Inc.

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FY2010 Annual Report · Rexahn Pharmaceuticals, Inc.
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Pipeline Overview: 

Rexahn’s  portfolio  consists  of  unique  compounds to  treat a 
wide  variety  of  conditions in  cancer and  the  central  nervous 
system  (CNS).  Our  diversified  pipeline  promises  to  improve 
the standards of care for multiple diseases.  

Among our best‐in‐class drug candidates is Serdaxin®, a well 
for  multiple  CNS 
characterized  chemical  entity  tested 
indications.  Data 
that 
study shows 
IIa 
it improves symptoms of major depressive disorder (MDD). A 
Phase  IIb  trial  for  MDD  commenced  in  January  2011.  In 
animal disease models Serdaxin promotes survival of neuronal cells, which suggests 
that  it  may  provide  an  innovative  approach  for  the  treatment  of  other  brain 
conditions, such as Parkinson’s and Alzheimer’s disease.    

from a  Phase 

Zoraxel™  is  another  best‐in‐class  drug.  Unlike  other  erectile  dysfunction  (ED)  drugs 
targeting  peripheral  blood  flow,  Zoraxel  boosts  sexual  functions  by  directly 
modulating  specific  brain  activities.  This  mechanism  may  give  Zoraxel  a  superior 
safety  profile  and  promise  increased  patient  satisfaction  over  standard  medications 
such  as  Viagra®.   The  Phase  IIa  clinical  trial  of  Zoraxel  has  been  completed  with 
positive results, and the Phase IIb trial will start in the second half of 2011.   

In the oncology sector, Archexin® is a novel first‐in‐class compound with FDA orphan 
designation in the treatment of cancers in various organs including the pancreas and 
ovaries. Archexin specifically blocks the production of Akt‐1,  a molecule that plays a 
central  role  in  the  uncontrolled  growth  of  tumor  mass,  and  therefore  may  play  an 
important 
and 
tolerability. Archexin  is  in  Phase  II  clinical  trials  for the  treatment  of  pancreatic 
cancer. 

chemotherapy  with 

improved 

efficacy 

cancer 

role 

in 

Rexahn also has a robust preclinical oncology product pipeline that features potential 
first‐in‐class therapeutics: 

RX­5902 is a novel regulator of p68 RNA helicase, which is known to play a vital role 
in  cell  proliferation,  gene  transcription  and  translation.    The  enzyme  has  also  been  
implicated  in  tumor/cancer  progression.  Studies  with  RX‐5902  demonstrated 
superior  inhibition  of  the  tumor  growth  in  human  pancreatic  and  melanoma 
xenograft  models  to  comparators,  without  body  weight  decrease. 
It  also 
demonstrated superior survival benefit in many human xenograft tumor models.  RX‐

 
 
 
 
 
 
5902  is  in  late  stage  preclinical  development  and  will  be  available  as  an  oral 
formulation.  

RX­3117  is  being  co‐developed  with  Teva  Pharmaceutical  Industries  for  the 
treatment  of  cancers,  in  particular  gemcitabine‐resistant  lung  cancer.  RX‐3117  has 
shown  potent  anti‐tumor  effects  in  xenograft  human  tumor  models.  Preclinical 
studies  revealed  a  high  bioavailability  and  superior  toxicity  profile  compared  to 
gemcitabine, the current first‐line therapy for pancreatic and other cancers.  RX‐3117 
is in late stage preclinical development. 

RX­8243,  a  novel  isoquinolinamine  analogue,  is  a  multikinase  inhibitor.  It  inhibits 
Ark1 (Aurora A) kinase and other Ser/Thr kinases such as activated ERK, p38 and Akt. 
Preclinical studies showed RX‐8243 inhibited the proliferation of human cancer cells 
at  low  nanomolar  concentrations  and  potently  blocked  tumor  growth  in  xenograft 
models. 

RX­1792, a quinazoline analogue, inhibits epidermal growth factor receptor (EGFR), 
a critical component of tumor growth and metastasis. Preclinical studies showed RX‐
1792 inhibits tumor growth in xenograft models. 

RX­0201­Nano is a stealth nanoliposomal product of RX‐0201, the active ingredient 
of Archexin, with high incorporation efficiency and excellent stability.  Nanoliposomal 
delivery  of  RX‐0201  may  provide  significant  clinical  benefits  including  targeted 
delivery  to  tumors,  extended  circulation  time,  reduced  drug‐related  toxicity,  and 
improved efficacy.  

RX­0047­Nano is a potent inhibitor of HIF‐1α, which is a key transcription factor for 
cancer  cell  survival,  metastasis,  and  angiogenesis.  It  inhibits  proliferation  of  human 
cancer  cells  at  low  nanomolar  concentrations..  It  is  also  effective  against  radiation‐
resistant cancer cells. RX‐0047 also inhibits tumor growth in xenograft models such 
as lung and prostate, and blocks metastasis. 

Among  Rexahn’s  prominent  nano‐polymer  drugs,  RX­21101 (HPMA‐docetaxel)  and 
RX­21202  (HPMA‐gemcitabine)  are  anticancer  drugs  that  can  overcome  the 
downside  of  cytotoxic  compounds,  such  as  poor  solubility,  stability,  and  severe 
adverse  reactions.  Conjugating  water‐soluble  and  non‐toxic  HPMA  to  conventional 
anticancer  compounds  bolsters  efficacy  while  lowering  toxicity  by  specific  tumor 
targeting and increased stability in body. 

 
 
 
 
 
 
 
 
Chairman Letter:  

Dear fellow stockholder: 

2010  was  a  year  of  major  progress  for  Rexahn.  The 
achievements we have made move ever closer to our goal 
of  becoming  a  commercially  successful  biopharmaceutical 
company. 

In  the  past  year  we  continued  to  develop  our  robust 
pipeline  of  novel  therapeutics  for  cancers  and  CNS‐based 
disorders.  In  particular,  we  advanced  all  three  of  our 
clinical  stage  drug  candidates  –  Serdaxin®,  Zoraxel™,  and 
Archexin® – to Phase II clinical trials.  

We are particularly excited about the commercial potential of Serdaxin, our lead CNS 
drug  candidate.  After  successfully  completing  a  Phase  IIa  study  we  were  able  to 
identify responders to Serdaxin for major depressive disorder (MDD). Based on those 
results, and with the support of our newly established MDD Scientific Advisory Board 
of    key  neuropsychiatry  opinion  leaders,  we  have  initiated  a  300‐patient  Phase  IIb 
trial.  

We  also  established  a  Parkinson’s  Scientific  Advisory  Board  to  help  us  evaluate 
Serdaxin’s  novel  neuroprotective  properties  for  treating  Parkinson’s  disease.  This 
board is composed of  leading medical researchers in neurology. Upon their scientific 
review of Serdaxin, and with their encouragement, we are planning to begin a Phase 
II Parkinson’s study in 2011. 

In  addition,  we  made  headway  in  Zoraxel’s  development  program,  submitting  a 
protocol to the FDA for a Phase IIb study in erectile dysfunction. And we continue to 
make  solid  progress  with  our  ongoing  Phase  II  study  of  Archexin  for  pancreatic 
cancer.  

We  continue  to  broaden  our  preclinical  portfolio  and  now  have  eight  oncology 
compounds  in  various  stages  of  development.  One  of  these  compounds,  RX‐3117,  is 
being  developed  under  a  partnership  with  Teva  Pharmaceuticals.  This  important 
relationship  continues  to  blossom  as  we  work  towards  developing  RX‐3117  and 
beginning clinical trials in 2011. 

 
 
 
 
 
 
 
 
 
We anticipate another successful year in 2011. We expect to achieve more important 
clinical  milestones  for  Serdaxin,  Zoraxel  and  Archexin,  as  well  as  for  several  of  our 
preclinical  compounds.  We  also  expect  to  introduce  new  drug  candidates  to  the 
pipeline that will further enhance our long‐term competitive position. 

On behalf of our Board and our employees, I would like to thank you all for your 
continued support. 

Sincerely, 

Chang H. Ahn, Ph.D. 
Chairman and CEO 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Annual Report Information Provided to Shareholders 

Rexahn Pharmaceuticals, Inc. (the “Company”) filed its Annual Report on Form 10-K for the year ended 
December  31,  2010  with  the  Securities  and  Exchange  Commission  (the  “SEC”)  on  March  16,  2011,  which  was 
subsequently amended on Form 10-K/A filed with the SEC on March 23, 2011. 

The  purpose  of  the  amendment  on  Form  10-K/A  was  to  provide  additional  disclosure  in  the  footnotes 
contained in Item 8 and Item 15 of the Form 10-K regarding terms of certain warrants issued by the Company and 
the Company’s (a) total comprehensive loss and (b) uninsured cash balance. These revised footnote disclosures had 
no material impact on the financial statements contained in Item 8 and Item 15 of the Form 10-K.  Additionally, the 
amendment  on  Form  10-K/A  revised  a  risk  factor  regarding  timing  of  FDA  approval  and  added  a  risk  factor 
regarding marketing period exclusivity. 

The Company has attached a copy of both the Form 10-K and Form 10-K/A. Please note  sections of the 
Form 10-K that were amended by the Form 10-K/A, as described above, have been omitted.  For a free copy of the 
Form 10-K and Form 10-K/A please send a request to: 

Rexahn Pharmaceuticals, Inc. 
Attn: Investor Relations 
15245 Shady Grove Road, Suite 455 
Rockville, MD 20850  

 
 
 
 
UNITED STATES SECURITIES AND EXCHANGE COMMISSION 
Washington, D.C. 20549  

Form 10-K 

(cid:59)  

(cid:134)  

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES 
EXCHANGE ACT OF 1934  
  For the fiscal year ended December 31, 2010 

TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE 
SECURITIES EXCHANGE ACT OF 1934  
  For the transition period from          to            

OR

Commission file number: 001-34079 
Rexahn Pharmaceuticals, Inc.  
(Exact name of registrant as specified in its charter)  

Delaware  
(State or other jurisdiction of 
incorporation or organization)  

15245 Shady Grove Road, Suite 455 
Rockville, Maryland 
(Address of principal executive offices)  

11-3516358  
(I.R.S. Employer 
Identification No.)  

20850 

(Zip Code)  

 (240) 268-5300 
(Registrant’s telephone number, including area code)  
Securities registered pursuant to Section 12(b) of the Exchange Act:  

Title of Each Class  
Common Stock, $.0001 par value per share  

   Name of Each Exchange on Which Registered 

NYSE AMEX 

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

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the 

Securities Act.  Yes (cid:134)     No (cid:59)  

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of 

the Exchange Act.  Yes (cid:134)     No (cid:59)  

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) 

of the Exchange Act 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 (cid:59)     No (cid:134)  

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web 

site, if any, every Interactive Data File required to be submitted and posted 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 and post such files).   Yes (cid:134)     No (cid:134)  

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not 

contained herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information 
statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. [  ] 

 
   
  
   
  
   
 
 
 
 
   
     
 
 
 
 
 
  
 
 
 
 
 
 
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated 
filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller 
reporting company” in Rule 12b-2 of the Exchange Act. (Check one):  

Large accelerated filer (cid:134) 

Accelerated filer  (cid:134) 

Non-accelerated filer (cid:134)   Smaller reporting company (cid:59)

                                                                  (Do not check if a smaller reporting company)  

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange 

Act).  Yes (cid:134)     No (cid:59)  

State the aggregate market value of the voting and non-voting common equity held by non-affiliates computed 

by reference to the price at which the common equity was last sold, or the average bid and asked price of such 
common equity, as of the last business day of the registrant’s most recently completed second fiscal quarter: As of 
June 30, 2010, the aggregate market value of the registrant’s common stock held by non-affiliates of the 
registrant was $97,940,504 based on the closing price reported on NYSE Amex.  

Indicate the number of shares outstanding of each of the registrant’s classes of common stock, as of 

the latest practicable date:  

Class  

Outstanding at March 16, 2011

Common Stock, $.0001 par value per share  

86,779,406 shares 

DOCUMENTS INCORPORATED BY REFERENCE  

Document  

Parts Into Which Incorporated  

Portions of the registrant’s Proxy Statement for the 
Annual Meeting of Stockholders to be held on    
June 6, 2011  

Part III  

iii 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cautionary Statement Regarding Forward-Looking Statements.  This Annual Report on 
Form 10-K contains statements (including certain projections and business trends) accompanied 
by such phrases as “believe,” “estimate,” “expect,” “anticipate,” “will,” “intend” and other 
similar expressions, that are “forward-looking statements” as defined in the Private Securities 
Litigation Reform Act of 1995.  We caution that forward-looking statements are based largely on 
our expectations, and are subject to a number of known and unknown risks and uncertainties that 
are subject to change based on factors which are, in many instances, beyond our control.  Actual 
results, performance or achievements may differ materially from those contemplated, expressed, 
or implied by the forward-looking statements.  

The following factors, among others, could cause our financial performance to differ 

materially from that expressed in such forward-looking statements: 

• 

• 

• 

• 

• 

• 

• 

our lack of profitability and the need for additional capital to operate our business; 

our  ability  to  obtain  the  necessary  U.S. and  worldwide  regulatory  approvals  for  our  drug 
candidates; 

successful and timely completion of clinical trials for our drug candidates; 

demand for and market acceptance of our drug candidates; 

the availability of qualified third-party researchers and manufacturers for our drug development 
programs; 

our ability to develop and obtain protection of our intellectual property; and 

other risks and uncertainties, including those set forth herein under the caption “Risk Factors” and 
those detailed from time to time in our filings with the Securities and Exchange Commission.  

These  forward-looking  statements  are  made  only  as  of  the  date  hereof,  and  we  undertake  no 
obligation  to  update  or  revise  the  forward-looking  statements,  whether  as  a  result  of  new  information, 
future  events  or  otherwise.    The  safe  harbors  for  forward-looking  statements  provided  by  the  Private 
Securities  Litigation  Reform Act  are  unavailable  to  issuers  of  “penny  stock.”    Our  shares  may  be 
considered a penny stock and, as a result, the safe harbors may not be available to us. 

 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 

INDEX  

PAGE 

PART I .............................................................................................................................................1 
Item 1.  Description of Business ................................................................................................1 
Item 1A.  Risk Factors .............................................................................................................18 
Item 1B.  Unresolved Staff Comments ...................................................................................18 
Item 2.  Description of Property .............................................................................................19 
Item 3.  Legal Proceedings ......................................................................................................19 
Item 4.  [Removed and Reserved] ...........................................................................................19 

PART II ..........................................................................................................................................20 

Item 5.  Market for Common Equity, Related Stockholder Matters and 

Issuer Purchases of Equity Securities ....................................................................20 
Item 6.  Selected Financial Data .............................................................................................21 
Item 7.  Management’s Discussion and Analysis of Financial Condition 

and Results of Operation .........................................................................................22 
Item 7A.  Quantitative and Qualitative Disclosures About Market Risk ...........................36 
Item 8.  Financial Statements and Supplementary Data ......................................................36 
Item 9. Changes In and Disagreements With Accountants on Accounting 

and Financial Disclosure .........................................................................................36 
Item 9A.  Controls and Procedures ........................................................................................36 
Item 9B.  Other Information ...................................................................................................41 

PART III ........................................................................................................................................42 
Item 10.  Directors, Executive Officers and Corporate Governance ..................................42 
Item 11.  Executive Compensation .........................................................................................42 
Item 12. Security Ownership of Certain Beneficial Owners and 

Management and Related Stockholder Matters ...................................................42 

Item 13.  Certain Relationships and Related Transactions; and Director 

Independence ............................................................................................................42 
Item 14.  Principal Accounting Fees and Services ................................................................42 
Item 15.  Exhibits, Financial Statement Schedules ...............................................................43 

SIGNATURES ...............................................................................................................................46 

v 

 
 
Explanatory Note 

The Explanatory note that was included in this Form 10-K has been amended and can be found in 

the Form 10-K/A immediately following this document.  

. 

 
 
 
 
 
 
 
 
Item 1.  Description of Business 

PART I 

Any  references  to  “we,”  “us,”  “our,”  the  “Company”  or  “Rexahn”  shall  mean  Rexahn 

Pharmaceuticals, Inc. 

We are a clinical stage biopharmaceutical company developing and seeking to deliver novel cures 
for cancer and disorders of the central nervous system (CNS) to patients worldwide.  Our mission is to 
discover and develop new medicines for diseases that plague patients with no effective cures, in particular 
high mortality cancers and CNS disorders.  Our pipeline features three drug candidates in Phase II clinical 
trials this year and several other drug candidates in pre-clinical development.  Our strategy is to continue 
building a significant product pipeline of innovative medicines that we will commercialize alone or with 
pharmaceutical  partners.    For  a  description  of  our  pipeline  drug  candidates,  see  “Our  Pipeline  Drug 
Candidates” in this Item 1. 

Our  principal  corporate  office  is  located  at  15245  Shady  Grove  Road,  Suite  455,  Rockville, 

Maryland 20850 in Maryland’s I-270 technology corridor.  Our telephone number is (240) 268-5300. 

Rexahn currently has three clinical stage drug candidates: Archexin®, Serdaxin®, and ZoraxelTM. 
Our lead anticancer drug candidate, Archexin, is an inhibitor of the protein kinase Akt. Akt plays critical 
roles  in  cancer  cell  proliferation,  survival,  angiogenesis,  metastasis,  and  drug  resistance.    Archexin 
received “orphan drug” designation from the U.S. Food and Drug Administration (FDA) for five cancer 
indications  (renal  cell  carcinoma  (RCC),  glioblastoma,  ovarian  cancer,  stomach  cancer  and  pancreatic 
cancer).  The FDA orphan drug program enables expedited FDA review or approval process, seven years 
of marketing exclusivity after approval and tax incentives for clinical research.   

Archexin is currently in Phase II clinical trials for the treatment of pancreatic cancer with several 
patients  enrolled  and  enrollment  continuing  in  2011.  Archexin’s Phase  II  clinical  trial  protocol  for  the 
treatment  of  renal  cell  carcinoma  (RCC)  was  accepted  by  the  FDA,  but  issues  with  enrollment  have 
delayed the trial.  Such enrollment issues were primarily due to the fact that there is a small number of 
patients that have been diagnosed with RCC and such patients are often treated with surgery instead of 
drug therapies.  After further consideration of the trial design and the limited  number of patients, there 
was a reallocation of resources and Rexahn reprioritized Archexin to pursue studies in pancreatic cancer.   

We  are  currently  developing  Serdaxin  for  the  treatment  of  depression  and  neurodegenerative 
disorders.  Rexahn expects to complete a 300 patient Phase IIb clinical trial for major depressive disorder 
(MDD)  with  Serdaxin  in  2011  and  is  planning  the  Phase  II  clinical  trial  for  Parkinson’s  disease  (PD).  
Unlike the current standard treatment that treats symptomatic conditions, Serdaxin is a disease modifying 
drug  that  protects  neurons  from  damage  that  can  lead  to  dysfunction  and  eventual  neuronal  death.  
Considering that over 60% of patients with Parkinson’s, Alzheimer’s, and Multiple Sclerosis also suffer 
from depression, Serdaxin’s effectiveness in treating depression and as a neuroprotective agent may make 
it a potential market leader for the treatment of neurological diseases.   

We  are  developing  Zoraxel  for  treatment  of  erectile  dysfunction  (ED).    Zoraxel  is  a 
developmental stage drug for sexual dysfunction that directly modulates the sexual activity control center 
in the brain.  Zoraxel enhances the action of serotonin and dopamine, brain signaling molecules that play 
a key role in three phases of male sexual activity: arousal, erection and release.  Zoraxel is the first ED 

1 

 
 
 
 
 
 
 
 
 
 
 
 
therapeutic  to  affect  all  three  of  these  phases.    Preclinical  studies  demonstrated  that  Zoraxel  improves 
sexual  performance  via  enhanced  motivation  and  arousal.    Due  to  its  centrally  acting  mechanism  of 
action, Zoraxel may also have potential use in the treatment of female sexual dysfunction.  With positive 
results of the Phase IIa clinical trial of Zoraxel, the Phase IIb trial will continue through 2011-2012. 

Company Background 

Our company resulted from a merger of Corporate Road Show.Com Inc., originally a New York 
corporation  (CPRD)  which  was  formed  in  November  1999,  and Rexahn,  Corp,  a  Maryland  corporation 
immediately after  giving  effect  to  a 1-for-100  reverse  stock  split  and  the  reincorporation of  CPRD  as  a 
Delaware  corporation  under  the  name  “Rexahn  Pharmaceuticals,  Inc.”  (Rexahn  Pharmaceuticals),  with 
Rexahn, Corp surviving as a wholly owned operating subsidiary of ours (the Merger).  The Merger was 
effective as of May 13, 2005.  On September 29, 2005, Rexahn, Corp, was merged with and into us, and 
Rexahn, Corp’s separate existence was terminated. 

Rexahn, Corp was founded in March 2001 and began as a biopharmaceutical company focusing 
on oncology drugs.  Dr. Chang Ahn, our Chairman, a former U.S. Food and Drug Administration (FDA) 
reviewer,  and  National  Cancer  Institute  (NCI)  research  scientist,  helped  guide  initial  research  and 
commercialization  efforts  in  targeted  cancer  drugs  and  the  company’s  expansion  into  disorders  of  the 
central nervous system (CNS).  Our mission is to find new cures that improve the health and wellness of 
patients with life-threatening or life-altering diseases.  

Industry and Disease Markets  

Overview 

Our research and development focuses on several therapeutic areas that affect the lives of many 
people—cancer, CNS disorders such as depression, mood disorders, sexual dysfunction, and Parkinson’s 
disease.  These disorders can have a debilitating effect on the quality of life for patients who suffer from 
them.  Our strategy is to develop innovative drugs that alter the signaling pathways implicated in these 
diseases, and thereby help patients regain an improved quality of life. 

According to the Center for Disease Control and Prevention, cancer claims the lives of more than 
half a million Americans each year and is the second leading cause of death among Americans.  In 2008, 
the National Cancer Institute estimated that $228 billion was spent in medical costs in the United States.  
Worldwide, it is predicted that the number of new cancer cases diagnosed will rise to 16 million annually 
in  2020,  with  cancer-related  deaths  reaching  10  million  in  2020.1   Global  sales  of  cancer  drugs  are 
predicted to grow to $70 billion by 2018 in the seven major markets, driven mainly by commercialization 
of molecular targeted therapies.2   

Currently,  there  are  45  million  estimated  cases  of  depression  in  the  US  and  its  drug  cost  alone 
exceeded  $19  billion  in  2007.    Several  classes  of  drugs  are  available  on  the  market  for  depression, 
including  selective  serotonin  uptake  inhibitors  (“SSRI”),  serotonin-norepinephrine  reuptake  inhibitors 
(“SNRI”), and tricyclic antidepressants (“TCA”). However, these drugs are prone to side-effects, such as 
insomnia,  weight  gain  and  sexual  dysfunction,  and they  can  take  up  to  6  weeks  to  relieve  depression 
symptoms.  

1 Cancer, 2007 (Datamonitor). 
2 Cancer Market and Definition Overview, 2009 (Datamonitor). 

2 

 
 
 
 
 
 
 
 
 
 
 
                                                 
Parkinson’s  disease  is  the  most  common  motor  disorder.   In  the  United  States,  50,000-60,000 
new cases of PD are diagnosed each year, adding to the one million people who currently have PD.  In 
fact, it is estimated that four to six million people around the world suffer from the condition. Age is the 
most important risk factor for PD, and the aging world population is expected to push the number of the 
afflicted  to  over  10  million  by  2030.  In  addition,  its  chronic  and  debilitating  nature  has  a  high  socio-
economic  impact.    In  the  US  alone,  the  financial  cost  of  the  disease  is  estimated  to  exceed  $6  billion 
annually.  PD is characterized by the progressive loss of dopaminergic neurons in the brain.  The resulting 
dopamine depletion leads to its cardinal motor symptoms, such as rigidity (muscle stiffness), bradykinesia 
(slowing of movement), postural instability and resting tremor.  These impairments are accompanied by 
non-motor  disabilities,  including  dementia,  depression,  and  sleep  disturbance.    The  current  standard 
treatment options target the dopaminergic pathway, either by supplementing the molecule or stimulating 
dopamine receptors (binding partners of dopamine). While these strategies ameliorate symptoms in early 
stages, they become less effective over the course of the disease.  In addition, dopamine therapies fail to 
tackle the underlying causes of the disease, and therefore, do not slow the progression of PD or extend the 
life expectancy of patients. 

Erectile  dysfunction  causes  the  consistent  inability  to  attain  and  maintain  an  erection  sufficient 
for satisfactory sexual intercourse.  Erectile problems may be due to psychogenic causes (e.g., depression 
or  stress),  organic  causes,  or  both.    The  launch  of  the  first  orally  available  phosphodiesterase  (PDE)-5 
inhibitor,  Viagra®,  in  1998  established  a  new  standard  of  care  for  ED  and  pioneered  a  new  market.  
Cialis® and Levitra® were subsequently launched in 2003 as second-generation PDE-5 inhibitor drugs.  
However,  30%  of  patients  are  refractory  or  unresponsive  to  the  leading  PDE-5  inhibitor  drugs.    In 
addition, PDE-5 inhibitors also increase the risk of a variety of cardiovascular diseases, including heart 
attack.  As evidenced by clinical data from the Phase IIa trial, Zoraxel does not have some of the safety 
concerns  seen  with  PDE-5  inhibitors.  Contrary  to  peripherally  acting  PDE-5  inhibitors,  Zoraxel  acts 
centrally in the brain affecting all three aspects of sexual activity. 

Current Cancer Treatments 

The life-threatening nature of cancer, and the various ways of trying to cure cancer to save lives, 
has led to treatment(s) with surgery, radiation therapy, and chemotherapy.  Surgery is widely used to treat, 
and in many cases cure cancer; however, there may be related or significant complications and surgery 
may be ineffective if metastasis has occurred.  Radiation therapy, or radiotherapy, can be highly effective.  
Ionizing radiation deposits energy that injures or destroys cells in the area being treated by damaging their 
genetic material, making it impossible for these cells to continue to grow.  Although radiation damages 
both cancer cells and normal cells, the normal cells are generally able to repair themselves and function 
properly.    Cytotoxic  cancer  drugs  destroy  cancer  cells  by  interfering  with  various  stages  of  the  cell 
division  process.    However,  many  current  cytotoxic  chemotherapy  drugs  have  limited  efficacy  and 
debilitating adverse side effects and may result in the development of multi-drug resistance.  

Unmet Needs in Cancer  

Despite  significant  advances  in  cancer  research  and  treatments,  high  unmet  needs  still  remain 

including:  

•  Long-term  management  of  cancers:  Surgery, chemotherapy or radiation therapy may not 
result  in  long-term  remission,  though  surgery  and  radiation  therapies  are  considered  cure 
methods.  Therefore, there is a need for more effective drugs and adjuvant therapies to treat 
relapsed and refractory cancers. 

3 

 
 
 
 
 
 
 
 
 
 
•  Multi-drug  resistance:  Multi-drug  resistance  is  a  major  obstacle  in  successful  clinical 

outcomes. 

•  Debilitating  toxicity  by  chemotherapy:  Chemotherapy  as  a  mainstay  of  cancer  treatment 

induces severe adverse reactions and toxicities, affecting quality of life or life itself. 

Archexin:  First-in-class Anticancer Akt Inhibitor 

Archexin  is  a  first-in-class,  potent  inhibitor  of  the  Akt  protein  kinase  (Akt)  in  cancer  cells. 
Archexin  has  FDA  orphan  drug  designations  for  five  cancers  (RCC,  glioblastoma,  and  cancers  of  the 
ovary, stomach and pancreas).  Multiple indications for other solid tumors can also be pursued. Archexin 
is  differentiated  by  its  ability  to  inhibit  both  activated  and  inactivated  forms  of  Akt,  and  to  potentially 
reverse  the  drug  resistance  observed  with  the  protein  kinase  inhibitors.    Other  targeted  drugs  may  only 
inhibit inactivated Akt and be vulnerable to development of drug resistance.  Akt activation plays a key 
role in cancer cell proliferation, survival, angiogenesis and drug resistance.  Akt is over-activated in many 
human cancers (e.g., breast, colorectal, gastric, pancreatic, prostate, and melanoma cancers).  A method to 
control the Akt activity involves inhibition of signaling molecules upstream of Akt in cancer cells (e.g., 
EGFR or VEGFR inhibitors).  In this case, only the activity of native Akt is indirectly affected.  However, 
signal transmission for cancer progression and resistance occurs when Akt is activated, thus inhibition of 
the activated Akt becomes more important.  Archexin inhibits both activated and native Akt. 

Archexin is an antisense oligonucleotide (ASO) compound that is complementary to Akt mRNA, 
and  highly  selective  for  inhibiting  mRNA  expression  and  production  of  Akt  protein.    Archexin  has 
demonstrated  excellent  safety,  tolerability  and  minimal  side  effects  in  a  Phase  I  study  in  patients  with 
advanced  cancers,  where  Grade  3  (G3)  fatigue  was  the  only  dose-limiting  toxicity  and  no  significant 
hematological abnormalities were observed. The main objectives of the Phase I study were to determine 
maximum  tolerated  dose  (MTD),  dose  limiting  toxicity,  and  pharmacokinetic  (pk)  parameters  for 
Archexin  monotherapy.    The  Archexin  Phase  I  study  design  was  an  open  label,  single  arm  ascending 
dose,  safety and  tolerability  study.    Archexin’s Phase  II  clinical  trial  protocol for  the  treatment  of  RCC 
was accepted by the FDA, but issues with enrollment have delayed the trial.  Such enrollment issues are 
primarily due to the fact that there are a small number of patients that have been diagnosed with RCC and 
such patients are often treated with surgery instead of drug therapies.  After further consideration of the 
trial  design  and  the  limited  number  of  patients,  there  was  a  reallocation  of  resources  and  Rexahn 
reprioritized  Archexin  to  pursue  studies  in  pancreatic  cancer.    Archexin is  currently  in  Phase  II  clinical 
trials for the treatment of pancreatic cancer with several patients enrolled in the United States and India 
and the Phase II protocol for the treatment of ovarian cancer is being developed.   

The Company has been issued a U.S. patent for Archexin that covers composition of matter and 
broad  claims  for  the  nucleotide  sequences  of  the  antisense  compounds  that  target  and  inhibit  the 
expression  of  Akt  in  human  tissues  or  cells,  and  the  method  of  using  the  compounds  to  induce 
cytotoxicity in cancer cells. 

4 

 
 
 
 
 
 
 
Current CNS Treatments 

The U.S. National Institute of Mental Health (NIMH) estimates that 26 percent of adults, or more 
than 55 million Americans, suffer from a diagnosable  mental disorder in a given year.  The depression 
market  is  one  of  the  more  mature  and  established  markets  in  CNS  therapeutics.  Current  treatments  for 
depression  focus  on  serotonin-based  drugs  (e.g.,  selective  serotonin  reuptake  inhibitors)  as  a  first-line 
treatment.    Many  depression  patients  are  refractory  to  the  various  classes  of  antidepressants  and  suffer 
from severe side effects. 

Unmet Needs in CNS Disorders: Major Depressive Disorder 

Unmet needs for treating MDD include3 the following: 

•  Faster onset of action. Current antidepressants take four to six weeks to relieve depression 
symptoms.  The delay in onset of antidepressant activity is associated with the most common 
antidepressant  drug  classes  including:  selective  serotonin  reuptake  inhibitors  (SSRIs), 
inhibitors 
serotonin-norepinephrine  reuptake 
(MAOIs), and tricyclic antidepressants (TCAs). 

inhibitors  (SNRIs),  monoamine  oxidase 

•  Fewer side effects. The most widely used antidepressants, SSRIs, are linked with side effects 
of insomnia, weight gain and sexual dysfunction.  The safety of SSRIs has also been called 
into  question  over  concerns  about  inducing  suicidal  ideations.    Use  of  benzodiazepines  is 
linked with side effects of cognitive deficit and motor impairment. 

• 

Improved  compliance.  High  rate  of  serious  side  effects  among  patients  taking  anti-
depressant drugs leads many to stop taking the prescribed medicines, resulting in high non-
compliance rates of 40% to 65%. 

•  Need  for  greater  efficacy.    Remission  is  one  key  objective  of  depression  treatment.    The 
proportion of patients achieving remission after antidepressant treatment ranges from 35% to 
55% depending on the severity of depression.4  New drugs with much higher efficacy as well 
as wider coverage of the depression patients are needed. 

•  Reduced MDD relapse.  High relapse rate of about 35% and lingering symptoms are serious 

problems in antidepressant treatment. 

Serdaxin: CNS Drug to Treat Neurodegenerative Disorders, Depression, and Mood Disorders 

Serdaxin is a potential market leading CNS neuroprotective agent and antidepressant.  Based on its novel 
actions as a dual serotonin and dopamine enhancer, it is a potential treatment for multiple CNS disorders 
where these neurotransmitters are depleted or implicated in CNS-based illnesses such as Parkinson’s 
disease and depression.  It has shown neuroprotective effects in the substantia nigra, hippocampus, and 
nucleus accumbens- areas of the brain involved in neurodegenerative diseases.  Serdaxin’s Phase IIa 
clinical trial for depression is complete with positive results and a Phase IIb trial in patient recruitment.     

3   Depression, June 2007; Stakeholder Insight: Major Depressive Disorder (MDD), March 2006 (Datamonitor). 

4   Remission rates tend to vary based on factors such as: treatment algorithm and drugs prescribed, patient geographic population 
or country, prescribing doctor (primary care, psychiatrist), and time at which remission rates are measured (3, 6, 8, or 10 weeks 
of treatment). Depression, June 2007; MDD, March 2006 (Datamonitor). 

5 

 
 
 
 
 
 
 
 
 
 
 
 
                                                 
The proof-of-concept, randomized, double blind, placebo controlled and dose ranging (5 mg, 10 mg, 15 
mg administered twice daily) Phase IIa clinical trial enrolled 77 MDD patients at multiple sites in the 
United States.    No statistical difference was seen between the three doses and the placebo on the 
Montgomery-Asberg Depression Rating Scale (“MADRS”).  A high dropout rate of non-responders in the 
placebo group contributed to a higher-than-expected response for the placebo-treated subjects that 
completed the study.  We believe this high dropout rate may have contributed to the absence of statistical 
significance.  In our ad hoc analysis, results from the Phase IIa clinical trial showed that patients suffering 
from MDD responded most positively to the 5 mg dose of the drug, and supported proceeding to a Phase 
IIb clinical trial.  In the subgroup analysis, the study showed that patients with severe MDD taking 5 mg 
of Serdaxin had significant improvement in MADRS scores after 8 weeks of treatment, compared to the 
placebo group. Among the 77 patients, 53 patients were classified as having severe MDD.  Of the 14 
patients treated with 5 mg of Serdaxin, MADRS scores improved by 55.6%, compared to only 34.0% in 
the placebo group (n = 14), which was statistically significant (p=0.041) on an intent to treat basis.  In 
addition, 64.3% of patients with severe MDD treated with 5 mg of Serdaxin were considered 
“Responders” compared to 28.6% in the placebo group (p=0.0581).  A “Responder” is a patient with a 
change from baseline in MADRS score of greater than or equal to 50% after treatment.  Additionally, 
42.9% of patients in the treatment group at 5 mg of Serdaxin were in remission with a MADRS score of 
less than or equal to 12 after treatment, at 8 weeks versus 14.3% in the placebo group (p=0.209).  During 
the trial there were no reports of serious side effects that are commonly linked to currently marketed 
antidepressant drugs, such as selective serotonin uptake inhibitors, (“SSRI”), serotonin-norepinephrine 
reuptake inhibitors, (“SNRI”), and tricyclic antidepressants,(“TCA”).  The 5 mg Serdaxin-treated group 
(20 adverse events) reported 40% fewer adverse events such as headache than the placebo group (36 
adverse events).  In addition, the 5 mg Serdaxin-treated group reported a lower dropout rate in week 2 of 
4.8% compared to 9.1% in the placebo group, and by week 8 the drop-out rate for the Serdaxin group was 
only 14.3% compared to 59.1% in the placebo group.  Pre-clinical studies suggest that Serdaxin may have 
an inverted, U-shape dose-response curve.  This inverted, dose-response relationship may explain the 
observation in the Phase IIa trial of a more positive response in patients taking the lowest dose.  Due to 
this phenomenon, higher doses of Serdaxin may not be effective, suggesting an additional potential 
benefit with respect to the risk of overdose problems prevalent in other psychogenic medications.  A 
Phase IIb trial for MDD with lower doses has commenced startup activities.  Multiple indications are also 
being considered, including possible use in general anxiety and other mood disorders.     

Serdaxin  has  well-established  and  extensive  safety  in  humans,  and  appears  to  have  excellent 
tolerability  and  few  side  effects.    Its  greatest  potential  may  be  as  a  neuroprotective  agent  that  further 
addresses  the  morbidity  of  depression  and  mood  disorders  that  are  linked  to  CNS  illnesses  of  the 
neurodegenerative category, such as PD and Alzheimer’s disease. In regards to PD, Serdaxin has shown 
in animal models that it has the potential to address both non-motor and motor events of PD in humans, 
by  treating  depleted  dopamine  levels  that  lead  to  loss  of  control  of  movements;  and  further,  enhancing 
serotonin and dopamine levels that are involved in depression and mood disorders.  Serdaxin may achieve 
greater and broader therapeutic coverage, and appears to have no cognition deficit and side effects such as 
nausea,  vomiting,  insomnia,  weight  gain,  and  sexual  dysfunction  that  are  linked  to  existing  drugs.  
Clinical programs are also being developed for PD. Serdaxin is a new class of CNS disorder therapeutics 
that has prevented neuronal deaths in PD models.  In contrast to other PD drugs, Serdaxin directly targets 
the  disease  mechanism  by  slowing  or  halting  the  progression  of  the  disease,  fulfilling  unmet  needs  in 
Parkinson’s  disease  treatment.    Currently,  Phase  II  clinical  trials  for  the  use  of  Serdaxin  in  PD  are 
scheduled to commence in 2011. 

Current Sexual Dysfunction Treatment 

6 

 
 
 
 
The  launch  of  the  first  orally  available  PDE-5  inhibitor,  Viagra,  in  1998  established  a  new 
standard care for ED and pioneered a new market.  Cialis and Levitra were subsequently launched in 2003 
as  second-generation  PDE-5  inhibitor  drugs.    However,  30%  of  patients  are  refractory  to  the  leading 
PDE-5 inhibitor drugs.  In addition, PDE-5 inhibitors also increase the risk of a variety of cardiovascular 
diseases, including heart attack.  The majority of ED drugs in the R&D pipeline work by a ‘me-too’ PDE-
5 inhibitor mechanism of action.5  Dopamine agonists are also in clinical trials for ED.6   

Unmet Needs in Sexual Dysfunction 

There  are  potential  severe  side  effects  associated  with  PDE-5  drugs,  such  as  priapism,  severe 
hypotension, myocardial infarction, sudden death, increased intraocular pressure and sudden hearing loss.  
PDE-5  inhibitors  only  target  end  organ  erectile  function,  and  work  in  peripheral  blood  vessels.    Other 
than PDE-5 inhibitors, there are no dominating drugs for treatment of sexual dysfunction. 

•  Need for Greater Efficacy- An estimated 30% of US men are refractory to the leading PDE-
5  inhibitor  drugs  (Viagra,  Cialis,  and  Levitra),  which  work  peripherally  and  mechanically. 
Certain segments of the ED patient population that respond less to PDE-5 inhibitors include 
diabetics, obese or post-surgical prostatectomy or coronary risk patients.   

•  Reduced  Side  Effects- PDE-5 inhibitors have significant drawbacks of cardiovascular risks 
and other side effects (e.g., priapism, severe hypotension, myocardial infarction, ventricular 
arrhythmias, sudden death and increased intraocular pressure). 

Zoraxel: Drug Candidate to Treat Erectile Dysfunction Sexual Dysfunction 

Zoraxel is centrally acting in the CNS and may be a more effective ED treatment for patients who 
are  responsive  or  unresponsive  to  PDE-5  inhibitors.    Zoraxel  is  being  developed  as  an  orally 
administered, on-demand tablet to treat sexual dysfunction, and has extensive and well-established safety 
in  humans.    Zoraxel  is  a  dual  enhancer  of  neurotransmitters  in  the  brain  that  play  a  key  role  in  sexual 
activity phases of motivation and arousal, erection and release, and may be the first ED drug to affect all 
three  of  these  phases  of  sexual  activity.  In  preclinical  animal  studies,  Zoraxel  significantly  improved 
sexual performance and suggested positive behavioral effects.  Rexahn’s decision to move forward with 
the  Phase  IIb  trial  is  supported  by data  from  the  Phase  IIa  proof  of  concept,  randomized,  double blind, 
placebo controlled and dose ranging (5mg, 10mg 15mg) study of 39 erectile dysfunction patients (aged 18 
to  65)  treated  with  Zoraxel.    The  Phase  IIa  study  was  completed  in  May,  2009  and  demonstrated  that 
Zoraxel consistently improved International Index of Erectile Function (“IIEF”) scores of treated subjects.  
The  Phase  IIa  study  showed  treatment  with  15mg  of  Zoraxel  at  week  8  improved  subjects’  IIEF-EF 
scores of 6.5, which is calculated from the changes from the baseline between scores of 15 mg of Zoraxel 
(5.3)  and  the  placebo  group  (-1.2).    Furthermore,  the  study  showed  among  treated  subjects  a  dose 
dependent  treatment  effect  with  improved  erectile  function  and  quality  of  life  measures.    Zoraxel  was 
found to be safe and well tolerated, with no serious adverse events reported.  The Phase IIb trial, which 
will  include  the  Sexual  Encounter  Profile  (SEP)  survey,  IIEF  and  quality  of  life  study  endpoints  will 
begin in 2011.  

5 Erectile Dysfunction, 2006 (Datamonitor). 
6 Gresser U and Gleiter CH. Erectile Dysfunction: Comparison of efficacy and side effects of the PDE-5 inhibitors sildenafil, 

vardenafil and tadalafil (Review of Literature). Eur J Med Res (2002) 7:435-46. 

7 

 
 
 
 
 
 
 
 
                                                 
Market Opportunity 

There are several factors favorable for commercializing new cancer, CNS and sexual dysfunction 

drugs that may be first-in-class or market leaders, including: 

•  Expedited  Regulatory  or  Commercialization  Pathways.    Drugs  for  life-threatening  diseases 
such  as  cancer  are  often  treated  by  the  FDA  as  candidates  for  fast  track,  priority  and 
accelerated  reviews.    Expedited  regulatory  review  may  lead  to  clinical  studies  that  require 
fewer patients, or expedited clinical trials.  Our lead products, Serdaxin and Zoraxel, are also 
expected to have expedited or shortened clinical development timelines because their active 
pharmaceutical ingredient has extensive and well established safety in humans. 

•  Favorable  Environment  for  Formulary  Access  and  Reimbursement.    Cancer  drugs  with 
proven efficacy or survival benefit, and cost-effective clinical outcomes would be expected to 
gain rapid market uptake, formulary listing and payer reimbursement.  In addition, drugs that 
have orphan designations are generally reimbursed by insurance companies given that there 
are few, if any, alternatives.  Because mental disorders affect more than 55 million estimated 
Americans,  the  burden  of  illness  is  significant  for  insurance  companies  as  well  as  for 
employers.    Given  the  significant  cost  of  treating  behavioral  health  problems,  there  is  a 
favorable  environment  for  formulary  access  and  reimbursement  for  effective  products  that 
treat multiple disorders. 

•  Focus  on  Specialty  Markets.    The  marketing  of  new  drugs  to  specialty  physicians  can  be 
accomplished  with  a  specialty  sales  force  that  requires  fewer  personnel  and  lower  related 
costs  than  a  typical  sales  force  that  markets  to  primary  care  physicians  and  general 
practitioners.  

Our Strategy 

Our strategy has several key components: 

Develop innovative therapeutics with the potential to be first-in-class or market leaders 

We plan to expand our R&D pipeline and introduce more new drugs into clinical trials over the 
next five years, and develop an industry-leading oncology therapeutics franchise.  Our pipeline spans the 
major  classes  of  cancer  drugs  –  molecular  targeted  therapies,  signal  transduction  and  multi-kinase 
inhibitors,  nano-medicines,  and  small  molecule  cytotoxics  (microtubule  inhibitors,  quinazoline  and 
nucleoside  analogues).    Differentiated  target  product  profiles  and  proprietary  discovery  and  research 
technology platforms further support these strategic efforts.  Further, we plan to commercialize neurology 
and psychiatry drugs for growing CNS markets.  Rexahn has exclusive patent and development rights to a 
portfolio  of  CNS  compounds  that  are  repurposed  and  adaptable  for  clinical  development  in  multiple 
indications, including PD, depression, and neurodegenerative disorders.   

Target Signal Transduction Molecules with Multiple Drug Candidates 

We  plan  to  expand  our  oncology  drug  candidate  pipeline  and  introduce  several  new  signal 
inhibitor drugs into clinical trials over  the next five years.  By identifying and characterizing the genes 
and proteins that control the signaling pathways and gene expression of cancer cells, we seek to develop 

8 

 
 
 
 
 
 
 
 
 
 
 
 
 
DNA/RNA-based  and  small-molecule  drugs  to  treat  a  broad  range  of  diseases  caused  by  abnormal 
expression or functions of those genes and proteins.   

Establish Partnerships with Large Pharmaceutical Companies 

In  September  2009,  we  closed  on  licensing  and  stock  purchase  agreements  with  Teva 
Pharmaceutical  Industries  (“Teva”)  for  the  development  of  our  novel  anti-cancer  compound,  RX-3117. 
The  companies  reached  an  agreement  with  respect  to  the  commercialization  and  development  of  RX-
3117.  In January, 2011, we closed on an additional private placement with Teva, pursuant to the 2009 
stock  purchase  agreement,  which  was  amended  to  increase  the  amount  of  Teva’s  investment  for  the 
further  development  of  RX-3117  and  provided  for  a  possible  third  amendment  by  Teva.    We  seek  to 
establish strategic alliances and partnerships with large pharmaceutical companies for the development of 
other drug candidates.   

Clinically Develop Drug Candidates as Orphan Drugs to Reduce Time-to-Market 

Under  the  Orphan  Drug  Act,  the  FDA  may  expedite  approval  of  new  drugs  that  treat  diseases 
affecting less than 200,000 patients each year.  This category of diseases is called an “orphan indication.”  
Incentives  in  the  Orphan  Drug  Act  include  a  faster  time-to-market  of  the  drug  (with  FDA  approval 
possible after Phase II trials instead of Phase III trials) and seven years of drug marketing exclusivity for 
the sponsor.  We plan to develop drug candidates initially for orphan category cancers in order to reduce 
the time-to-market. 

In-License Unique Technology 

We continually review opportunities to in-license and advance compounds in oncology and other 
strategic therapeutic areas that have value creating potential and will strengthen our R&D pipeline.  For 
example,  in  February 2005,  we  licensed  the  intellectual  property  of  Revaax  Pharmaceuticals  LLC 
(“Revaax”) to develop new drugs for treatment of CNS and mood disorders.  As a result of this licensing 
agreement, we have now advanced Serdaxin and Zoraxel into Phase II clinical trials for depression and 
sexual dysfunction patients.  

Capitalize  on  Our  Management  Team’s  Expertise 
Commercialization 

for  Drug  Development  and  Product 

Our management team possesses clinical development experience in oncology and several other 
therapeutic  areas  that  facilitates  strategic  approaches  to  and  competitive  advantages  in,  the  design,  risk 
assessment,  and  implementation  of  drug  development  programs.  We  also  have  prior  experience  in 
pharmaceutical alliances, product launches and marketing. 

Our Pipeline Drug Candidates 

We have three clinical stage drug candidates, and several more pre-clinical drugs, including the 

following: 

Clinical Stage Pipeline: 

(1)  Archexin: First-in-class anticancer Akt inhibitor 

(2)  Serdaxin: CNS Disorders drug for depression and neurodegenerative diseases 

9 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(3)  Zoraxel: ED and sexual dysfunction drug 

Pre-clinical Pipeline: 

(1) RX-1792: Small molecule anticancer EGFR inhibitor   

(2) RX-5902: Small molecule anticancer RNA helicase regulator   

(3) RX-3117: Small molecule anticancer DNA synthesis Inhibitor 

(4) RX-8243: Small molecule anticancer aurora kinase inhibitor  

(5) RX-0201-Nano: Nanoliposomal anticancer Akt inhibitor 

(6) RX-0047-Nano: Nanoliposomal anticancer HIF-1 alpha inhibitor 

(7) RX-21101 & RX-21202: Nano-polymer Anticancer 

We have discussed our clinical stage pipeline in detail above. 

Pre-clinical Pipeline 

Our pre-clinical pipeline includes: 

(1) RX-1792: Small molecule anticancer EGFR inhibitor 

RX-1792 is a quinazoline analogue that suppresses EGFR (epidermal growth factor receptor), 
critical  component  of  tumor  growth  and  metastasis.  Preclinical  studies  have  shown  RX-1792  to  inhibit 
tumor growth in xenograft human tumor models. 

(2) RX-5902: Small molecule anticancer RNA helicase regulator 

RX-5902 is a novel regulator of p68 RNA helicase regulator, which is known to play a vital role in cell 
proliferation, initiation of gene transcription and has been implicated in tumor/cancer progression. Studies 
demonstrated superior inhibition in the growth of human pancreatic tumor and melanoma tumor in nude 
mice  after  oral  administration,  without  body  weight  decrease.    RX-5902  is  in  late  stage  preclinical 
development.  

 (3) RX-3117: Small molecule anticancer DNA synthesis inhibitor 

RX-3117  is  being  co-developed  with  Teva  for  the  treatment  of  cancer  cells  and  tumors,  in 
particular  gemcitabine-resistant  lung  cancer.  RX-3117  has  shown potent  anti-tumor  effects  in  xenograft 
human  tumor  models.  Preclinical  studies  revealed  the  high  bioavailability  and  superior  toxicity  profile 
compared to gemcitabine, the current first-line therapy for pancreatic and other cancers. 

(4) RX-8243: Small molecule anticancer aurora kinase inhibitor  

10 

 
 
 
 
 
  
 
 
 
 
 
 
 
  
  
  
  
 
 
RX-8243  is  a  novel  isoquinolinamine  analogue  that  inhibits  Ark1  (Aurora)  kinase  and  other 
Ser/Thr kinase in cancer cells. RX-8243 is a multikinase inhibitor that downregulates signal molecules of 
RAS as well as PI3K pathways such as activated forms of ERK, p38 and Akt. Preclinical studies showed 
RX-8243 blocks tumor growth in xenograft models at low nanomolar concentrations. 

(5) RX-0201-Nano: Nanoliposomal anticancer Akt inhibitor 

RX-0201, the active ingredient of Archexin, is a first-in-class, potent inhibitor of the Akt protein 
kinase.  RX-0201-Nano is a nanoliposomal product of RX-0201 with high incorporation efficiency and 
good  stability.    Nanoliposomal  delivery of  RX-0201 may  provide significant  clinical  benefits  including 
targeted  higher  cellular  uptake,  extended  circulation  time,  reduced  drug-related  toxicity,  and  improved 
efficacy.  

(6) RX-0047-Nano: Nanoliposomal anticancer HIF-1α inhibitor 

RX-0047  is  a  potent  inhibitor  of  HIF-1α,  a  key  transcription  factor  involved  in  cancer  cell 
survival, metastasis, and angiogenesis. HIF-1α is over-expressed in a broad range of human cancers, and 
associated with increased cancer mortality and resistance. RX-0047 inhibits proliferation of cancer cells 
of human origin at low nanomolar concentrations by lowering mRNA level of HIF-1α. It is also effective 
in  radiation-resistant  cancer  cells.  Studies  in  xenografted  model  have  shown  RX-0047  to  inhibit  tumor 
growth in lung and prostate and blocks metastasis. 

(7) RX-21101 & RX-21202: Nano-polymer Anticancer Drugs 

Among the prominent nano-polymer drugs in Rexahn, RX-21101(HPMA-docetaxel) and RX-

21202 (HPMA-gemcitabine) are anticancer drugs that can overcome the downside of cytotoxic 
compounds, such as poor solubility, stability, and severe adverse reactions. Conjugating water-soluble 
and non-toxic HPMA to conventional anticancer compounds bolster efficacy while lowering toxicity by 
specific tumor targeting and increased stability in body. 

Competition 

We are developing new drugs to address unmet medical needs in oncology, CNS disorders, and 
sexual  dysfunction  markets.    Our  drug  candidates  will  be  competing  with  products  and  therapies  that 
either currently exist or are expected to be developed.  Competition among these products will be based 
on factors such as product efficacy, safety, price, launch timing and execution.  Our competitive position 
will also depend upon our ability to attract and retain qualified personnel, to obtain patent protection or 
otherwise  develop  proprietary  products  or  processes,  and  to  secure  sufficient  capital  resources  for  the 
often substantial period between technological conception and commercial sales. 

There  are  a  number  of  pharmaceutical  and  biotechnology  companies,  as  well  as  academic 
institutions,  government  agencies  and  other  public  and  private  research  organizations,  which  are 
conducting  research  and  development  on  technologies  and  products  for  treatment  of  cancers,  CNS 
diseases  and  sexual  dysfunction.    Our competitors  may  succeed  in  developing  products  based  on  novel 
technologies  that  are  more  effective  than  ours,  which  could  render  our  technology  and  products 
noncompetitive prior to recovery by us of expenses incurred with respect to those products. 

Our  competitors  may  include  major  pharmaceutical,  specialized  biotechnology  firms,  and 
academic  and other research institutions.  Many of our competitors have substantially greater financial, 
technical  and  human  resources  than  we  do.    In  addition,  many  of  our  competitors  have  significantly 
greater  experience  than  we  do  in  undertaking  pre-clinical  testing  and  human  clinical  trials  of  new 

11 

 
 
 
 
 
 
 
 
 
 
 
 
pharmaceutical products and obtaining FDA and other regulatory approvals of products for use in health 
care. 

As  we  expand  our  drug  development  programs  to  include  diseases  other  than  cancer,  CNS  and 
sexual  dysfunction,  we  will  also  face  competition  from  pharmaceutical  and  biotechnology  companies 
conducting  research  and  development  on  products  for  treatment  of  those  other  diseases,  increasing  our 
competition.  For many of the same reasons described above, we cannot assure you that we will compete 
successfully. 

Government Regulation 

Regulation by governmental authorities in the United States and in other countries constitutes a 
significant  consideration  in  our  product  development,  manufacturing  and  marketing  strategies.    We 
expect  that  all  of  our  drug  candidates  will  require  regulatory  approval  by  appropriate  governmental 
agencies  prior  to  commercialization  and  will  be  subjected  to  rigorous  pre-clinical,  clinical,  and  post-
approval testing, as well as to other approval processes by the FDA and by similar health authorities in 
foreign  countries.    U.S. federal  regulations  control  the  ongoing  safety,  manufacture,  storage,  labeling, 
record keeping, and marketing of all biopharmaceutical products intended for therapeutic purposes.  We 
believe that we are in compliance in all material respects with currently applicable rules and regulations. 

Obtaining governmental approvals and maintaining ongoing compliance with federal regulations 
are expected to require the expenditure of significant financial and human resources not currently at our 
disposal.  We plan to fulfill our short-term needs through consulting agreements and joint ventures with 
academic  or  corporate  partners  while  building  our  own  internal  infrastructure  for  long-term  corporate 
growth. 

The  process  by  which  biopharmaceutical  compounds  for  therapeutic  use  are  approved  for 
commercialization in the United States is lengthy.  Many other countries have instituted equally difficult 
approval  processes.    In  the  United  States,  regulations  published  by  the  FDA  require  that  the  person  or 
entity sponsoring and/or conducting a clinical study for the purpose of investigating a potential biological 
drug  product’s  safety  and  effectiveness  submit  an  Investigational  New  Drug  (IND)  application  to  the 
FDA.  These investigative studies are required for any drug product for which the product manufacturer 
intends to pursue licensing for marketing the product in interstate commerce.  If the FDA does not object 
to  the  IND  application,  clinical  testing  of  the  compound  may  begin  in  humans  after  a  30-day  review 
period.  Clinical evaluations typically are performed in three phases. 

In Phase I, the drug is administered to a small number of healthy human subjects or patients to 
confirm  its  safety  and  to  develop  detailed  profiles  of  its  pharmacological  and  pharmacokinetic  actions 
(i.e., absorption, metabolism, excretion, duration of therapeutic concentration and effects, if any). 

In Phase II, the drug is administered to groups of patients (up to a total of 500) to determine its 
preliminary efficacy against the targeted disease and the requisite dose and dose intervals.   In a typical 
development program, additional animal toxicology studies precede this phase.  In some cases, the trial 
can  be  split  into  Phase  IIa  and  IIb  studies  in  order  to  test  smaller  subject  pools.    Some  Phase I  clinical 
studies may also proceed in parallel with some Phase II studies.   

In  Phase  III,  the  drug  is  administered  to  a  larger  group  of  patients  (usually  1,000  to  3,000  or 
more)  by  physicians  (study  site  investigators)  in  a  network  of  participating  clinics  and  hospitals.    The 
extensive clinical testing is intended to confirm Phase II results and to document the nature and incidence 
of adverse reactions.  Studies also are performed in patients with concomitant diseases and medications.  

12 

 
 
 
 
 
 
 
 
 
Larger  patient  populations  are  evaluated  in  Phase  III  at  multiple  study  sites  and  many  clinical  trial 
programs or registration studies are conducted concurrently for the sake of time and efficiency. 

After completing the clinical studies, the product developer submits the safety and effectiveness 
data generated by the studies to the FDA in the form of a New Drug Application (NDA) to market the 
product.    It  is  the  responsibility  of  the  FDA  to  review  the  proposed  product  labeling,  the  pre-clinical 
(animal and laboratory) data, the clinical data, the facilities utilized and the methodologies employed in 
the manufacture of the product to determine whether the product is safe and effective for its intended use. 

Even  after  initial  FDA  approval  has  been  obtained,  further  studies  may  be  required  to  provide 
additional  data  on  safety  or  to  gain  approval  for  expanded  labeling  or  treatment  indications.    Also,  the 
FDA may require post-marketing testing and surveillance programs to monitor the drug’s effects.  Side 
effects resulting from the use of drug products may prevent or limit the further marketing of the products. 

For  marketing  outside  the  United  States,  we  will  be  subject  to  foreign  regulatory  requirements 
governing  human  clinical  trials  and  marketing  approval  for  drugs.    The  requirements  relating  to  the 
conduct  of  clinical  trials,  product  licensing,  pricing  and  reimbursement  vary  widely  from  country  to 
country. 

Certain drugs are eligible in the United States for designation by the FDA as “orphan” drugs if 
their use is intended to treat a disease that affects fewer than 200,000 persons in the U.S. or the disease 
affects more than 200,000 persons in the United States but there is no reasonable expectation that the cost 
of developing and marketing a drug will be recovered from the  U.S. sales of such drug.  In order for a 
sponsor to obtain orphan designation for a drug product, an application must be submitted for approval to 
the  FDA’s  Office  of  Orphan  Products  Development.    The  approval  of  an  application  for  orphan 
designation  is  based  upon  the  information  submitted  by  the  sponsor.    A  drug  that  has  obtained  orphan 
designation is said to have “orphan status.”  The approval of an orphan designation request does not alter 
the standard regulatory requirements and process for obtaining marketing approval.  Safety and efficacy 
of a compound must be established through adequate and well-controlled studies. 

Orphan  drugs  may  obtain  FDA  approval  after  successful  Phase  II  trials,  rather  than  after 
completion  of  Phase  III  trials,  resulting  in  faster  time-to-market  for  those  drugs.    If  a  sponsor  obtains 
orphan drug designation for a particular compound and is the first to obtain FDA regulatory approval of 
that compound, then that sponsor is granted marketing exclusivity for a period of seven years. 

Sales and Marketing 

Rexahn plans to commercialize unique and differentiated drugs that are first-in-class or potential 
market leaders.  We may develop cancer drugs for orphan indications initially, and then expand into more 
highly prevalent cancers.  Currently, Archexin has Orphan drug designation for five cancer indications. 
For drugs that require larger pivotal trials and/or large sales force, Rexahn seeks alliances and corporate 
partnerships  with  larger  pharmaceutical  firms.  We  also  seek  acquisition  or  in-licensing  candidates  to 
strengthen our product pipeline. 

Research Technologies  

Our research technologies are focused on our proprietary multi-target aimed ligands platform and 
nano-based  drug  delivery.  For  a  discussion  of  collaboration  arrangements  pursuant  to  which  we  obtain 
research  and  development  services  from  universities,  research  institutions  and  other  organizations,  see 
“Collaboration and License Agreements” in this item. 

13 

 
 
 
 
 
 
 
 
 
 
 
The Inhibitors of Multi-Expression Signals (TIMES) 

TIMES  is  Rexahn  a  unique  ligand  discovery  platform  targeting  multi-expression  signals.  Since 
cancer is a complex disease caused by multiple factors as well as genetic modifications, cancer treatment 
involves a combination of drugs with different mechanisms of action, which compound degree and extent 
of toxicities.  Rexahn’s approach is to control multiple targets important for cancer proliferation with a 
single  agent.    In  doing  so,  Rexahn  utilizes  a  proprietary,  genomics-based  integrated,  gene  expression 
system to identify potentially important targets that control multiple genes or signaling events in cancer 
cells.  

3-D Gateway of Ligand Discovery (3-D GOLD) 

3D-GOLD  is  a  drug  discovery  platform  that  integrates  3-D  natures  of  molecular  modeling, 
databases of chemicals and proteins, and ligand filtering and generation. The chemical database contains 
3D  structures  of  about  5  million  compounds.  Rexahn’s  proprietary  quantitative  structure-activity 
relationship  tool  for  innovative  discovery  and  docking  tools  are  parts  of  the  platform.  The  filtering 
module is a powerful component to determine similarity in pharmacophore and 3D fingerprinting, while 
ligand generation helps optimize the leads. 

Nano-medicine Drug Delivery  

Rexahn  has  developed  unique  proprietary  drug  delivery  nano-systems  that  may  increase  the 
availability  of  a  drug  at  the  disease  site,  minimize  adverse  reactions,  and/or  provide  longer  duration  of 
action.    Rexahn  is  currently  testing  multiple  nanoliposomal-  and  nanopolymer-based  anticancer  drugs.  
Rexahn was awarded grants from Maryland Industrial Partnerships and is collaborating with the Center 
for  Nanomedicine  of  University  of  Maryland  to  accelerate  the  development  of  its  proprietary  nano 
technologies and nano products. 

Manufacturing and Distribution 

We  do  not  currently  have  the  resources  required  for  commercial  manufacturing  of  our  drug 
candidates.  We currently outsource the manufacturing of drug substances and drug products for our drug 
candidates.  We believe that there are a limited number of manufacturers that could manufacture our drug 
candidates.    We  have  no  current  plans  to  build  internal  manufacturing  capacity  for  any  product.  
Manufacturing  will  be  accomplished 
large 
pharmaceutical companies.  We do not have any specific distribution plans at this time.   

through  partnerships  with 

through  outsourcing  or 

Intellectual Property  

Proprietary patent and intellectual property (IP) protection for our drug candidates, processes and 
know-how is important to our business. We aggressively prosecute and defend our patents and proprietary 
technology.  Rexahn has several U.S. and international patents issued for broad IP coverage of our drug 
candidates  in  cancer,  CNS,  behavioral  and  mood  disorders,  neuroprotection  and  sexual  dysfunction, 
effective  until  2020  to  2025.  Additional  U.S.,  Europe,  and  foreign  patents  are  pending.  We  also  rely 
upon trade secrets, know-how, continuing technological innovation and licensing opportunities to develop 
and maintain our competitive position. 

In  particular,  Rexahn  owns  US  patents  for  its  clinical  and  Pre-clinical  candidates  including  US 
Patents related to RX-1792, RX-3117, Archexin and RX-0047. In addition, Rexahn owns issued patents 
in South Korea related to RX-1792, RX-3117, and in Switzerland, Germany, Spain, France, Great Britain, 
Italy, and  Poland  related  to  RX-3117.   Additional  US  and/or  foreign  patent  applications  related  to  RX-

14 

 
 
 
 
3117,  RX-8243,  RX-5902,  RX-21101  and  RX-21202  are  pending. Rexahn  also  owns  pending  US  and 
foreign patent applications related to Zoraxel and Serdaxin.   

 In  February 2005,  we 

from  Revaax 
Pharmaceuticals,  LLC.  The  intellectual  property  rights  acquired  cover  use  of  certain  compounds  for 
anxiety, depression, aggression, cognition, Attention Deficit Hyperactivity Disorder, neuroprotection and 
sexual  dysfunction.  See  "Collaboration  and  License  Arrangements"  in  this  Item  for  additional 
information. 

licensed-in  CNS-related 

intellectual  property 

Rexahn  is  the  exclusive  licensee  of  three issued  US  Patents,  and  issued  patents  in  Australia, 
Mexico, New Zealand,  Belgium, Switzerland, Germany, Denmark, Spain, Finland, France, Great Britain, 
Ireland, Italy, the Netherlands and Sweden, related to Serdaxin.  Rexahn is the exclusive licensee of one 
issued  US  Patent  related  to  Zoraxel.   Rexahn  is  also  the  exclusive  licensee  of  additional  pending  US 
and/or  foreign  patent  applications  related  to  Zoraxel  and/or  Serdaxin.   See  “Collaboration  and  License 
Arrangements” in this Item for additional information. 

Collaboration and License Arrangements 

We  have  numerous  collaborative  research  and  development  relationships  with 
universities,  research  institutions  and  other  organizations.  A  description  of  these 
material relationships is below. 

Teva  Pharmaceutical  Industries  (Teva).  On  September  21, 
2009,  we  closed  on  licensing  and  stock  purchase  agreements  with 
Teva  for  the  development  of  our  novel  anti-cancer  compound,  RX-
3117.  RX-3117  is  a  small  molecule,  new  chemical  entity (NCE), 
nucleoside  compound  that  has  an  anti-metabolite  mechanism  of 
action,  and  has  therapeutic  potential  in  a  broad  range  of  cancers 
including  colon,  lung  and pancreatic  cancer.  The  companies  reached 
an agreement with respect to the commercialization and development 
of  RX-3117,  under  which  Teva  purchased  3,102,837  shares  of  our 
common  stock  for  $3.5  million.  We  will  be  eligible  to  receive 
additional  development,  regulatory  and  sales  milestone  payments.  In 
addition,  we  will  be  eligible  to  receive  royalties  on  net  sales 
worldwide.  On  January  19,  2011,  we  entered 
into  a  second 
amendment to this agreement, where Teva purchased 2,334,515 shares 
of our common stock for $3.95 million.  This second amendment also 
provided  for  a  possible  third  investment  by  Teva,  in  the  amount  of 
$750,000. 

TheraTarget,  Inc.  (TheraTarget).  On  December  14,  2009, 
Rexahn  and  TheraTarget,  a  developer  of 
innovative  polymer 
therapeutics  for  the  treatment  of  cancer,  formed  a  joint  research 
the  agreement, 
collaboration  agreement.  Under 
TheraTarget  will  synthesize  and  supply  us  with  polymer-drug 
conjugate  products,  which  are  part  of  our  polymer-based 
nanomedicine portfolio.  

terms  of 

the 

Korea  Research 

Institute  of  Chemical  Technology 
(KRICT). On July 13, 2009, we entered a licensing partnership with 

15 

 
 
 
the  Korea  Research  Institute  of  Chemical  Technology  (KRICT)  to 
develop  a  synthetic  process  for  Quinoxalines  compounds.  These 
compounds  provide  selective  toxicity  towards  hypoxic  cells  –  cells 
found  in  solid  tumors  and  that  are  resistant  to  anticancer  drugs  and 
radiation therapy, making them a potential treatment for solid tumors.  

 The  University  of  Maryland  Baltimore 

(UMB).  On 
February  1,  2007,  we  entered  into  a  Maryland  Industrial  Partnership 
Agreement  with  the  UMB  to  collaborate  with  and  sponsor  the  joint 
development  of  polymer-drug  conjugates  for  cancer  therapy,  for  the 
targeted  delivery  of  cancer  drugs.  Intellectual  property  made  or 
developed  under  this  agreement  is  jointly  owned  by  us  and 
UMB.  This project is currently on-going. 

Revaax  Pharmaceuticals  LLC  (Revaax).  On  February  10, 
2005, we licensed on an exclusive basis, with the right to sublicense, 
all  of  the  IP  of  Revaax,  which  includes  four  patents  and  multiple 
patent  applications,  with  respect  to  certain  chemical  structures  that 
have demonstrated in pre-clinical research the potential to treat certain 
behavioral  disorders,  such  as  anxiety,  depression  and  cognitive 
disorders (the “Licensed Products”).  This agreement expires upon the 
expiration  of  the  royalty  term  for  all  Licensed  Products  in  all 
countries,  which  is  no  earlier  than  August  2020  and  could  extend  to 
August  2024.  This  agreement  provides  for  an  initial  license  fee  and 
milestone payments based on the initiation of pivotal trials for disease 
treatment indication for licensed products.   

This agreement provides for an initial license fee and milestone 
payments based on the initiation of pivotal trials for disease treatment 
indication  for  licensed  products.  Furthermore,  we  will  pay  Revaax  a 
specified  fee  for  each  Licensed  Product  under  the  agreement  upon 
receipt  of  the  first  approval  by  any  federal,  state  or  local  regulatory, 
department, bureau or other governmental entity necessary prior to the 
commercial 
(“Marketing 
the  Licensed 
Approval”).  Notwithstanding  the  milestone  payment  arrangement 
described above, we are not obligated to make any milestone payment 
with  respect  to  milestone  events  for  which  we  receive  sublicense 
revenues  and  are  obligated  to  pay  Revaax  a  percentage  of  such 
sublicense revenues, as well as royalties for sales of Licensed Products 
based on net sales of the Licensed Products. 

Product 

sale 

of 

Under the agreement we agreed to pay Revaax an initial license 
fee  of  $375,000,  payable  in  8  installments  of  $46,875  each  over  a 
period of 2 years from February 10, 2005. In addition, we also agreed 
to pay Revaax a number of one time payments within 30 days of the 
first  achievement  of  the  following  milestones,  (a)  $500,000  with 
respect  to  the  dosing  of  the  first  patient  in  the  first  Phase  III  clinical 
trial  or  other  controlled  study  in  humans  of  the  efficacy  and  safety 
with  regards  to  any product  the  manufacture,  use  or  sale  of  which  is 
covered by a any claim of an issued and unexpired patent (the “Pivotal 
Trial”) within the Licensed Products, and $250,000 with respect to the 

16 

 
sublicense 

dosing of the first patient, in the second, third, fourth and fifth Privotal 
Trial,  and  $125,000  with  respect  to  the  dosing  of  the  first  patient  in 
any  subsequent  Pivotal  Trial,  (b)  $5,000,000  with  respect  to  the 
receipt  of  Marketing  Approval,  and  $2,500,000  with  respect  to  the 
receipt of the second, third, fourth and fifth Marketing Approval for a 
Licensed  Product,  and  $1,250,000  with  respect  to  any  subsequent 
Marketing  Approval.  We  are  not  under  an  obligation  to  make  any 
payments  with  respect  to  milestone  events  for  which  we  receive  any 
non-creditable upfront fees or milestone payments received by us from 
any 
and 
commercialization of a Licensed Product by such sublicense, less any 
license fees, milestone payments, or royalties payable by us to a third 
party under any technology acquisition agreement in connection with 
the  development  or  commercialization  of  a  Licensed  Product,  but 
specifically  excluding  any  royalties  revenues  derived  from  any 
sublicense agreements. Also, at our option, we may elect to make up 
to 50% of any milestone payment in shares of our common stock with 
the  number  of  shares  determined  by  dividing  the  amount  of  the 
milestone  portion  by  the  fair  market  value  of  one  share  of  common 
stock, as reasonably determined by our board of directors.  

the  development 

connection  with 

in 

We also agreed to pay Revaax royalty payments on all sales of 
the Licensed Product made to third parties. The royalties consist of (a) 
4% of the portion of the aggregate net  sales of the  Licensed Product 
during a calendar year that is equal to or less than $250,000,000, (b) 
5% of the portion of aggregate net sales of the Licensed Product in a 
calendar  year  that  is  greater  than  $250,000,000  but  equal  to  or  less 
than  $500,000,000,  (c)  6%  of  the  aggregate  sales  of  the  Licensed 
Product  during  a  calendar  year  that  is  greater  than  $500,000,000  but 
equal  to  or  less  than  $750,000,000,  and  (d)  7%  of  the  aggregate  net 
sales  of  the  Licensed  Product  during  a  calendar  year  exceeds 
$750,000,000. The royalty payment obligations will expire on the later 
of (a) expiration of any claim of an issued and unexpired patent within 
the  Licensed  Products  which  has  not  been  held  unenforceable  or 
invalid and which has not been disclaimed or admitted to be invalid or 
unenforceable  through  reissue  or  otherwise  (the  “Valid  Claim”)  that, 
for the  licenses  granted  under  the  Agreement,  would  be  infringed  by 
the  sale  of  such  Licensed  Product,  and  (b)  10  years  after  the  first 
commercial  sale  of  the  Licensed  Product  by  us,  our  affiliates  or 
sublicenses anywhere in the world.  

Upon  expiration  of  the  Valid  Claim  for  a  particular  Licensed 
Product  in  a  particular  country,  each  of  the  royalty  fees  will  be 
reduced  by  50%  for  the  remainder  of  the  term  remaining  on  our 
royalty  payment  obligations,  resulting  in  royalty  fees  of  2%,  2.5%, 
3%, and 3.5%, as applicable.   

Rexgene  Biotech  Co.,  Ltd.  (Rexgene).  On  February  6,  2003 
we entered into a Research Collaboration Agreement with Rexgene to 
collaborate  in  the  development  of  a  cancer  treatment  therapeutic 
compound  denominated  RX-0201(Archexin).  We  jointly  agreed  to 

17 

 
develop  a  research  and  development  plan  for  the  purpose  of 
registering  RX-0201  for  sale  and  use  in  the  Republic  of  Korea  and 
other  Asian  countries.  The  research  and  development  plan  would 
include clinical and animal trials to be conducted in the United States, 
clinical trials would be conducted in Korea and other Asian countries. 
We  agreed  to  provide  as  its  initial  contribution  to  the  joint 
development  and  research,  a  license  to all  technology  related  to RX-
0201. Rexgene agreed to provide, as its initial contribution $1,500,000 
to be used by us in further development of RX-0201. Rexgene agreed 
to  pay  us  a  royalty  fee  of  3%  of  net  sales  of  all  licenses  technology 
related  to  RX-0201  in  all  countries  in  Asia  by  Rexgene  or  any 
sublicensee of Rexgene.  

The agreement was scheduled to expire upon the last to expire 
of  all  US  and  foreign  patents  presently  or  in  the  future  issued  that 
cover RX-0201, or if no licensed patent is issued within 20 years from 
the date of execution of the agreement. A breach of the agreement by 
either party will afford the non-breaching party the right to terminate 
the  agreement  upon  90  days  written  notice  of  termination  specifying 
the  obligations  breached,  provided  that  within  said  90  days  the 
breaching party does not remedy the breach.  

Total Research and Development Costs 

 We  have  incurred  research  and  development  costs  of  $4,009,701  and  $3,251,971  for  the  years 
ended December 31, 2010 and 2009 respectively.  Research and development costs primarily consist of 
clinical  trials  and  preclinical  development  costs,  as  well  as  payroll  costs  for  research  and  development 
personnel.  

Employees 

We  currently  have  12  full-time  and  2  part-time  employees,  all  of  whom  are  based  either  at  our 
Rockville, Maryland office or our Germantown, Maryland lab facility.  Our employees are not covered by 
any  collective  bargaining agreement  and  we  have  never  experienced  a  work  stoppage.    We  believe  our 
relationships with our employees are satisfactory. 

Item 1A.  Risk Factors. 

The Risk Factors that were included in this Form 10-K has been amended and can be found in the 

Form 10-K/A immediately following this document.  

Item 1B.  Unresolved Staff Comments. 

A smaller reporting company is not required to provide the information required by this Item. 

18 

 
 
 
 
 
 
 
 
 
 
Item 2.  Description of Property. 

We lease approximately 5,466 square feet of office space at 15245 Shady Grove Road, Rockville, 
Maryland 20850.  We also lease approximately 1,100 square feet of laboratory space at 20271 Goldenrod 
Lane  2086,  #2088,  Germantown,  MD  20876.   The  facility  is  equipped  with  the  requisite  laboratory 
services required to conduct our business and we believe that our existing facilities are adequate to meet 
our needs for the foreseeable future.  The office lease, which commenced on June 29, 2009, is for a five 
year  term.   The  laboratory  lease,  which  commenced  on  July  1,  2009,  is  for  one  year  term  and  was 
renewed for an additional year commencing July 1, 2010.  We do not own any real property.  

Item 3.  Legal Proceedings. 

None 

Item 4.  [Removed and Reserved]. 

19 

 
 
 
 
 
 
 
 
 
PART II 

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

As of March 16, 2011, we are authorized to issue two classes of capital stock, which are common 
stock  and  preferred  stock.    Our  total  authorized  shares  of  common  stock  and  preferred  stock  are 
500,000,000  shares,  par  value  $0.0001 per  share,  and  100,000,000  shares,  par  value  $0.0001, 
respectively.    As  of  March  16,  2011,  we  have  86,779,406 shares  of  common  stock  outstanding  and 
approximately  2500 stockholders  of  record  of  common  stock.    As  of  March  16,  2011,  no  shares  of 
preferred stock are outstanding. 

Our  common  stock  is  traded  on  the  NYSE  AMEX,  formerly  known  as  the  American  Stock 
Exchange, under the ticker symbol “RNN.”  From May 16, 2005 to May 23, 2008 our common stock was 
traded on the Over the Counter Bulletin Board (the OTC-BB) under the ticker symbol “RXHN.”  From 
November  2004  until  May 13,  2005,  our  common  stock  was  traded  on  the  OTC-BB  under  the  ticker 
symbol “CPRD.”   

The  following  table  sets  forth  the  high  and  low  sales  prices  of  our  common  shares  as  reported 

during the periods indicated.   

Period 

2009 

First Quarter 
Second Quarter  
Third Quarter 
Fourth Quarter 

2010 

First Quarter 
Second Quarter 
Third Quarter 
Fourth Quarter 

Dividends 

High

1.06
2.00
1.14
1.06

1.65
3.65
1.49
1.24

Low

0.45
0.58
0.40
0.61

0.66
1.12
1.13
0.98

We  have  not  paid  any  cash  dividends  on  common  stock  and  do  not  expect  to  do  so  in  the 
foreseeable  future.    We  anticipate  that  any  earnings  generated  from  future  operations  will  be  used  to 
finance our operations.  No restrictions exist upon our ability to pay dividends. 

Purchase of Equity Securities by the Issuer and Affiliated Purchasers 

There were no repurchases of equity securities in 2010. 

Sale of Unregistered Equity Securities 

Pursuant  to  a  consulting  agreement,  dated  as  of  February  12,  2010,  by  and  between  JFS 
Investments and the Company, the Company issued an aggregate of 1,020,000 shares of common stock to 

20 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
JFS Investments.  The shares of common stock were issued in consideration for investor relation services 
provided  by  JFS  Investments.  The  shares  of  common  stock  were  not  registered  under  the  Securities 
Exchange  Act  of  1933,  as  amended  (the  “Securities  Act”)  pursuant  to  the  exemptions  from  the 
registration requirements provided by Section 4(2) of the Securities Act.  The Company delivered a notice 
to JFS Investments terminating the consulting agreement on November 12, 2010. 

Pursuant to a consulting agreement, dated as of February 12, 2010, by and between Garden State 
Securities, Inc. and the Company, the Company issued an aggregate of 680,000 shares of common stock 
to Garden State Securities, Inc.  The shares of common  stock were issued in  consideration for investor 
relation  services  provided  by  Garden  State  Securities  Inc.  The  shares  of  common  stock  were  not 
registered under the Securities Exchange Act of 1933, as amended (the “Securities Act”) pursuant to the 
exemptions  from  the  registration  requirements  provided  by  Section  4(2)  of  the  Securities  Act.    The 
Company  delivered  a  notice  Garden  State  Securities,  Inc.  terminating  the  consulting  agreement  on 
November 12, 2010. 

Equity Compensation Plan Information 

The following table provides information, as of December 31, 2010, about shares of our common 
stock  that  may  be  issued  upon  the  exercise  of  options,  warrants  and  rights  granted  to  employees, 
consultants or directors under all of our existing equity compensation plans. 

Number of 
securities to be 
issued upon 
exercise of 
outstanding 
options, warrants 
and rights 

Weighted average 
exercise price of 
outstanding 
options, warrants 
and rights 

Number of 
securities remaining 
available for future 
issuance under 
equity compensation 
plans 

8,076,795 

$1.01 

8,426,000 

– 
8,076,795 

– 
$1.01 

– 
8,426,000 

Equity compensation plans 
approved by stockholders 

Equity compensation plans 
not approved by 
stockholders 

Total 

Item 6.  Selected Financial Data. 

A smaller reporting company is not required to provide the information required by this Item. 

21 

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

You  should  read  the  following  discussion  and  analysis  of  our  results  of  operations,  financial  condition 
and liquidity in conjunction with our financial statements and the related notes, which are included in this 
Annual Report on Form 10-K.  Some of the information contained in this discussion and analysis or set 
forth elsewhere in this Annual Report on Form 10-K, including information with respect to our plans and 
strategies  for  our  business,  statements  regarding  the  industry  outlook,  our  expectations  regarding  the 
future  performance  of  our  business,  and  the  other  non-historical  statements  contained  herein  are 
forward-looking statements.  See “Cautionary Statement Regarding Forward-Looking Statements.”  You 
should also review the “Risk Factors” section under this Item 1A of this Annual Report for a discussion 
of important factors that could cause actual results to differ materially from the results described herein 
or implied by such forward-looking statements. 

Overview 

Our  company  resulted  from  the  merger  of  Corporate  Road  Show.Com  Inc.,  a  New  York 
corporation  incorporated  in  November 1999,  and  Rexahn,  Corp,  a  Maryland  corporation,  immediately 
after  giving  effect  to  our  reincorporation  as  a  Delaware  corporation  under  the  name  “Rexahn 
Pharmaceuticals,  Inc.”    In  connection  with  that  transaction,  a  wholly  owned  subsidiary  of  ours  merged 
with  and  into  Rexahn,  Corp,  with  Rexahn,  Corp  remaining  as  the  surviving  corporation  and  a  wholly 
owned  subsidiary  of  ours.    In  exchange  for  their  shares  of  capital  stock  in  Rexahn,  Corp,  the  former 
stockholders of Rexahn, Corp received shares of common stock representing approximately 91.8% of the 
Company’s outstanding equity after giving effect to the transaction.  Further, upon the effective time of 
the  Merger,  our  historic  business  was  abandoned  and  the  business  plan  of  Rexahn,  Corp  was  adopted.  
The transaction was therefore accounted for as a reverse acquisition with Rexahn, Corp as the accounting 
acquiring party and CPRD as the acquired party.  In September 2005, Rexahn, Corp was merged with and 
into the Company. 

Our  efforts  and  resources  have  been  focused  primarily  on  acquiring  and  developing  our 
pharmaceutical  technologies,  raising  capital  and  recruiting  personnel.    We  are  a  development  stage 
company  and  have  no  product  sales  to  date  and  we  will  not  receive  any  product  sales  until  we  receive 
approval  from  the  FDA  or  equivalent  foreign  regulatory  bodies  to  begin  selling  our  pharmaceutical 
candidates.    Our  major  sources  of  working  capital have  been  proceeds  from  various  private  financings, 
primarily  private  sales  of  common  stock  and  debt  securities,  and  collaboration  agreements  with  our 
strategic investors. 

Critical Accounting Policies 

A  “critical  accounting  policy”  is  one  which  is  both  important  to  the  portrayal  of  our  financial 
condition  and  results  and  requires  our  management’s  most  difficult,  subjective  or  complex  judgments, 
often as a result of the need to make estimates about the effect of matters that are inherently uncertain.  
Our accounting policies are in accordance with United States generally accepted accounting principles, or 
GAAP,  and  their  basis  of  application  is  consistent  with  that  of  the  previous  year.    Our  significant 
estimates  include  assumptions  made  in  estimating  the  fair  values  of  stock-based  compensation  and  our 
assessment relating to the impairment of intangible assets and deferred revenues.   

Research and Development 

Research and development costs are expensed as incurred.  Research and development expenses 
consist  primarily  of  third  party  service  costs  under  research  and  development  agreements,  salaries  and 
related  personnel  costs,  as  well  as  stock  compensation  related  to  these  costs,  costs  to  acquire 

22 

 
 
 
 
 
 
 
pharmaceutical  products  and  product  rights  for  development  and  amounts  paid  to  contract  research 
organizations, hospitals and laboratories for the provision of services and materials for drug development 
and clinical trials. 

Costs incurred in obtaining the license rights to technology in the research and development stage 

that have no alternative future uses and are for unapproved product compounds are expensed as incurred. 

Fair Value of Financial Instruments 

The  carrying  amounts  reported  in  the  accompanying  financial  statements  for  cash  and  cash 
equivalents,  prepaid  expenses  and  other  current  assets  and  accounts  payable  and  accrued  expenses 
approximate fair value because of the short-term maturity of these financial instruments.  The fair value 
methodology for our derivative instruments is described in detail in Item 8 of this Form 10-K. 

Income Taxes 

The  Company  accounts  for  income  taxes  in  accordance  with  ASC  740,  “Income  Taxes.”  
Deferred  tax  assets  and  liabilities  are  recorded  for  differences  between  the  financial  statement  and  tax 
basis of the assets and liabilities that will result in taxable or deductible amounts in the future based on 
enacted tax laws and rates.  ASC 740 requires that a valuation allowance be established when it is more 
likely than not that all portions of a deferred tax asset will not be realized.  A review of all positive and 
negative  evidence  needs  to  be  considered,  including  a  company’s  current  and  past  performance,  the 
market  environment  in  which  the  company  operates,  length  of  carryback  and  carryforward  periods  and 
existing  contracts  that  will  result  in  future  profits.    Income  tax  expense  is  recorded  for  the  amount  of 
income  tax  payable  or  refundable  for  the  period,  increased  or  decreased  by  the  change  in  deferred  tax 
assets and liabilities during the period. 

As a result of the Company’s significant cumulative losses, we determined that it was appropriate 

to establish a valuation allowance for the full amount of our deferred tax assets. 

The  calculation  of  our  tax  liabilities  involves  the  inherent  uncertainty  associated  with  the 
application  of  complex  tax  laws.    We  are  subject  to  examination  by  various  taxing  authorities.    We 
believe that as a result of our losses sustained to date, any examination would result in a reduction of our 
net  operating  losses  rather  than  a  tax  liability.    As  such,  we  have  not  provided  for  additional  taxes 
estimated under ASC 740.  

Warrant Liabilities 

In  accordance  with  ASC  480,  “Distinguishing  Liabilities  from  Equity,”  and  ASC  815, 
“Derivatives  and  Hedging,”  we  record  warrant  liabilities  at  fair  value  due  to  provisions  in  our  warrant 
agreements, as discussed in footnote 14 of Item 8 of this Form 10-K.  We reevaluate the fair value of our 
warrants at each reporting period, and changes in the fair value between reporting periods is records as 
“unrealized gain (loss) on fair value of warrants” in the statement of operations.   

Put Feature on Common Stock 

We  extended  anti-dilution  protection  provisions  on  our  common  stock  to  our  investors  in  our 
December 2007 and March 2008 financings, whereby in the event the we sell or issue shares below the 
effective purchase price paid, the investors would thereupon receive additional shares in a ratio outlined 
in  the  Securities  Purchase  Agreement.    In  accordance  with  ASC  Topic  480,  “Distinguishing  Liabilities 
from  Equity”,  this  feature  is  a  written  put  on  our  common  stock,  and  is  classified  as  a  liability  at  fair 
value.  We reevaluate the fair value at each reporting period, and changes in the fair value reporting is 
recorded as “unrealized gain (loss)” on put feature on common stock in the statement of operations.   

23 

 
 
Stock-Based Compensation 

In accordance with ASC 718, “Stock Compensation” compensation costs related to share-based 
payment transactions, including employee stock options, are to be recognized in the financial statements. 
In addition, the Company adheres to the guidance set forth within Securities and Exchange Commission 
(SEC)  Staff  Accounting  Bulletin  No.  107  (SAB  107),  which  provides  the  Staff’s  views  regarding  the 
interaction  between  ASC  718  and  certain  SEC  rules  and  regulations,  and  provides  interpretations  with 
respect to the valuation of share-based payments for public companies.  

Impairment of Long-Lived Assets 

In accordance with ASC 360, “Property, Plant and Equipment,” long-lived assets to be held and 
used are analyzed for impairment whenever events or changes in circumstances indicate that the related 
carrying amounts may not be recoverable.  The Company evaluates  at each  balance sheet date whether 
events  and  circumstances  have  occurred  that  indicate  possible  impairment.    If  there  are  indications  of 
impairment, the Company uses future undiscounted cash flows of the related asset or asset grouping over 
the remaining life in measuring whether the assets are recoverable.  In the event such cash flows are not 
expected  to  be  sufficient  to  recover  the  recorded  asset  values,  the  assets  are  written  down  to  their 
estimated fair value.  Management determined that an impairment of intangible assets occurred in 2009 
and wrote-off the assets remaining carrying value of $286,132.   

Concentration of Credit Risk 

ASC  825,  “Financial  Instruments,”  requires  disclosure  of  any  significant  off-balance  sheet  risk 
and  credit  risk  concentration.    The  Company  does  not  have  significant  off-balance  sheet  risk  or  credit 
concentration.  The Company maintains cash and short-term investments with major financial institutions.  
From  time  to  time  the  Company  has  funds  on  deposit  with  commercial  banks  that  exceed  federally 
insured limits.  The balances are insured by the Federal Deposit Insurance Corporation up to $250,000. At 
December  31,  2010,  the  Company  uninsured  cash  balances  or  $12,287,487.  Management  does  not 
consider this to be a significant credit risk as these banks and financial institutions are well-known. 

Recent Accounting Pronouncements Affecting the Company 

Fair Value Measurements 

In  January,  2010,  the  Financial  Accounting  Standards  Board  (“FASB”)  issued  guidance  which 
requires, in both interim and annual financial statements, for assets and liabilities that are measured at fair 
value on a recurring basis, disclosures regarding the valuation techniques and inputs used to develop those 
measurements.  It also requires separate disclosures of significant amounts transferred in and out of Level 
1 and Level 2 fair value measurements and a description of the reasons for the transfers.  This guidance is 
effective for the Company beginning January 1, 2011 and is required to be applied prospectively to new 
or significantly modified revenue arrangements.  Management currently believes that the adoption of this 
guidance will not have a material impact on the Company’s financial statements.  

Milestone Method of Revenue Recognition 

In April, 2010, the FASB issued guidance on defining a milestone and determining when it may 
be  appropriate  to  apply  the  milestone  method  of  revenue  recognition  for  research  and  development 
transactions.    Consideration  that  is  contingent  on  achievement  of  a  milestone  in  its  entirety  may  be 
recognized as revenue in the period in which the milestone is achieved only if the milestone is judged to 
meet certain criteria to be considered substantive.  Milestones should be considered substantive in their 
entirety  and  may  not  be  bifurcated.    An  arrangement  may  contain  both  substantive  and  nonsubstantive 

24 

 
milestones,  and  each  milestone  should  be  evaluated  individually  to  determine  if  it  is  substantive.    This 
guidance is effective on a prospective basis for milestones in fiscal years and interim periods within those 
years, beginning on or after June 15, 2010, with early adoption permitted.  The Company is evaluating the 
impact this guidance may have on its financial statements.  

25 

 
 
 
 
 
 
Results of Operations 

Comparison of the Year Ended December 31, 2010 and the Year Ended December 31, 2009 

Total Revenues 

Research  Revenue  remained  constant  at  $75,000  for  the  years  ended  December  31,  2010 
December 31, 2009.  Research revenue consists of the amortization of the contribution made by Rexgene 
for the joint development of Archexin.   

General and Administrative Expenses 

General  and  administrative  expenses  consist  primarily  of  salaries  and  related  expenses  for 
executive, finance and other administrative personnel, recruitment expenses, professional fees and other 
corporate expenses, including business development, investor relations, and general legal activities. 

General and administrative expenses increased $3,046,521, or 103.5%, to $5,990,624 for the year 
ended  December  31,  2010  from  $2,944,103  for  the  year  ended  December  31,  2009.    The  increase  is 
primarily attributed to the $2,108,000 value of compensatory stock issued to two vendors in exchange for 
investor relations services, as well as increased legal costs and insurance costs.  

Research and Development Expenses 

Research and development expenses consist primarily of salaries and related personnel costs, fees 
paid to consultants and outside service providers for laboratory development and other expenses relating 
to the design, development, testing, and enhancement of our drug candidates.  We expense our research 
and development costs as they are incurred. 

Research  and  development  expenses  increased  $757,730  or  23.3%,  to  $4,009,701  for  the  year 
ended  December  31,  2010,  from  $3,251,971  for  the  year  ended  December  31,  2009.    The  increase  is 
primarily due to the costs associated with the commencement of Serdaxin’s Phase IIB clinical trial in the 
fourth  quarter,  and  the  ongoing  development  of  RX-3117.    Research  and  Development  costs  also 
increased due to costs associated with the Phase II clinical trials of Archexin and Zoraxel, as well as pre-
clinical pipeline development.  Research and development expenses were offset by a grant of $822,137 
from the federal government which we were eligible under the Qualified Therapeutic Discovery Project 
Program. 

Patent Fees 

Our patent fees increased $26,705, or 8.8%, to $329,925 for the year ended December 31, 2010, 
from $303,220 for the year ended December 31, 2009.  The increase was primarily due to legal costs to 
respond to patent applications for the year ended December 31, 2010. 

Depreciation and Amortization 

Depreciation and amortization expense increased $9,055, or 21.8% to $50,659 for the year ended 
December 31, 2010 from $41,604 for the year ended December 31, 2009.  The increase is primarily due 
to  the  amortization  of  the  leasehold  improvements  to  our  office  space,  which  were  placed  in  service 
midway through 2009, but were in service for the entire year ended December 31, 2010. 

26 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Interest Income 

Interest income increased $65,823, or 97.6% to $133,268 for the year ended December 31, 2010 
from  $67,445  for  the  year  ended  December  31,  2009.    The  increase  is  due  to  a  greater  average  cash 
balance  due  to  financings  for  the  year  ended  December  31,  2010,  and  higher  interest  rates  on  interest 
bearing investments. 

Other Income 

Other  income  for  the  year  ended  December  31,  2010  was  $56,047,  which  represents  the 
settlement received from  Amarex to resolve a payment dispute as described in Footnote 3 of Item 8 of 
this Form 10-K.  We did not have other income for the year ended December 31, 2009. 

Unrealized (Loss)/Gain on Fair Value of Warrants 

Our warrants are recorded as liabilities at fair value.  Warrants are valued using a lattice model.  
Changes  in  the  fair  value  of  warrants  are  recorded  as  an  unrealized  gain  or  loss  in  our  statement  of 
operations.  In fiscal year 2010 and 2009, respectively, we recorded an unrealized (loss) gain on the fair 
value of our warrants of $(3,823,146) and $1,793,101.  The variance in the unrealized (loss) gain between 
the  years  ended  December  31,  2010  and  December  31,  2009  is  primarily  due  to  changes  on  our  stock 
price.    The  change  in  the  fair  value  of  our  warrants  is  a  non-cash  item  reflected  in  our  financial 
statements. 

Unrealized Gain on Fair Value of Put Feature on Common Stock 

We extended anti-dilution protection to our investors in our December 18, 2007 and March 20, 
2008  financings.  According  to  the  provision,  in the  event  that  we  issue  shares  below  an  effective  price 
paid by these investors, the investor would thereupon receive additional shares in a ration outlined in the 
securities purchase agreement. In accordance with ASC 480, the anti-dilution provision is a written put 
recorded as a liability at fair value on our balance sheet.  The provision is valued using a lattice model.  
Changes in the fair value of the put feature are recorded as an unrealized gain or loss in our statement of 
operations.  For the year ended December 31, 2010, we recorded an unrealized gain on the fair value of 
the put feature of $97,713, compared to an unrealized gain of $1,915,719 for the year ended December 
31,  2009.    The  variance  in  the  unrealized  gain  between  the  years  ended  December  31,  2010  and  2009 
results from the put feature expiring in December 18, 2009 and March 20, 2010. The change in the fair 
value of the put feature is a non-cash item reflected in our financial statements. 

Net Loss 

As  a  result  of  the  above,  net  loss  for  the  year  ended  December  31,  2010  was  $14,022,107,  or 
$0.18 per share, compared to a net loss of $2,903,098, or $0.05 per share, for the year ended December 
31, 2010. 

27 

 
 
 
 
 
 
 
 
 
 
 
 
 
Research and Development Projects 

Research  and  development  expenses  are  expensed  as  incurred.  Research  and  development 
expenses  consist  primarily  of  salaries  and  related  personnel  costs,  costs  to  acquire  pharmaceutical 
products  and  product  rights  for  development  and  amounts  paid  to  contract  research  organizations, 
hospitals  and  laboratories  for  the  provision  of  services  and  materials  for  drug  development  and  clinical 
trials.  Costs incurred in obtaining the license rights to technology in the research and development stage 
and have no alternative future uses are expensed as incurred.  Our research and development programs are 
related to our three clinical stage lead drug candidates, Archexin, Serdaxin and Zoraxel and pre-clinical 
stage  drug  candidates,  RX-3117,  RX-5902,  RX-8243,  RX-1792,  RX-0047-Nano,  RX-0201-Nano,  and 
Nano-polymer Anticancer Drugs.  Each of our lead drug candidates is in various stages of completion as 
described  below.  As  we  expand  our  clinical  studies,  we  will  enter  into  additional  development 
agreements.  Significant  additional  expenditures  will  be  required if  we  complete  our  clinical  trials,  start 
new  trials,  apply  for  regulatory  approvals,  continue  development  of  our  technologies,  expand  our 
operations and bring our products to market.  The eventual total cost of each clinical trial is dependent on 
a number of uncertainties such as trial design, the length of the trial, the number of clinical sites and the 
number of patients.  The process of obtaining and maintaining regulatory approvals for new therapeutic 
products is lengthy, expensive and uncertain.  Because the successful development of our most advanced 
drug  candidates,  Archexin,  Serdaxin  and  Zoraxel,  is  uncertain,  and  because  RX-3117,  RX-5902,  RX-
8243, RX-1792, RX-0047-Nano, RX-0201-Nano, and Nano-polymer Anticancer Drugs are in early-stage 
development, we are unable to estimate the costs of completing our research and development programs, 
the  timing  of  bringing  such  programs  to  market  and,  therefore,  when  material  cash  inflows  could 
commence  from  the  sale  of  these  drug  candidates.  If  these  projects  are  not  completed  as  planned,  our 
results of operations and financial condition could be negatively affected and if we are unable to obtain 
additional financing to fund these projects, we may not be able to continue as a going concern. 

The  table  below  summarizes  the  amounts  spent  on  each  of  our  research  and  development  projects 
through December 31, 2010: 

Clinical Candidates 
Archexin 
Serdaxin 
Zoraxel 

Preclinical  Candidates 
RX-3117 
Other Preclinical Compounds 

2010 

2009 

  Cumulative from 
March 19, 2001 
(Inception)  
to December 31, 
2010 

 $         240,000 
         1,220,000 
              40,000 

 $        800,000 
           200,000 
           200,000 

 $          6,240,000 
            2,220,000 
            1,040,000 

         1,500,000 
            270,000 
 $       3,270,000 

           250,000 
           200,000 
 $      1,650,000 

            1,800,000 
            1,520,000 
 $        12,820,000 

28 

 
 
 
 
 
 
 
 
 
 
 
 
 
 Archexin®  

Archexin, a 20 nucleotide single stranded DNA anti-sense molecule, is a best-in-class inhibitor of 
the  protein  kinase  Akt.    Akt  plays  critical  roles  in  cancer  cell  proliferation,  survival,  angiogenesis, 
metastasis,  and  drug  resistance.  Archexin  received  "orphan  drug"  designation  from  the  U.S.  Food  and 
Drug  Administration,  or  FDA,  for  five  cancer  indications  (renal  cell  carcinoma,  or  RCC,  glioblastoma, 
ovarian  cancer,  stomach  cancer  and  pancreatic  cancer).  The  FDA  orphan drug  program  provides  seven 
years of marketing exclusivity after approval and tax incentives for clinical research. In October 2006, we 
announced the conclusion of the Phase I clinical trial of Archexin, our leading drug candidate.  The Phase 
I clinical trial of Archexin, which took place at Georgetown University and the University of Alabama, 
was  an  open-label,  dose-escalation  study  with  14  day  continuous  infusion  in  17  patients  with  solid 
tumors.  The  Phase  I  trial  was  intended  primarily  to assess  the  safety  and  tolerability  of  Archexin  in 
patients  with  advanced  cancer.  The  trial results  showed that  the  dose  limiting  toxicity  of  Archexin 
occurring  at  315  mg/m2  dose  in  the  form  of  fatigue.  No  other  serious  adverse  events  such  as 
hematological  toxicities  were  observed  in  this  Phase  I  study.  In  the  Phase  I  study stable  disease  was 
observed in two out of the 17 Patients. Archexin is currently being studied in a Phase II clinical trial for 
the treatment of pancreatic cancer with several patients enrolled and enrollment continuing in 2011.  The 
Archexin Phase IIa trial is a single-arm, open-label study with 35 subjects conducted at global sites in the 
United States and India. Archexin will be administered in combination with gemcitabine in patients with 
advanced  pancreatic  cancer  to  assess  safety  and  preliminary  efficacy,  maximum  tolerated  dose,  and 
overall survival. Archexin’s Phase II clinical trial protocol for the treatment of RCC was accepted by the 
FDA,  but  issues  with  enrollment  have  delayed  the  trial.  The  enrollment  issues  were  primarily  due  to 
the small number of patients that have been diagnosed with RCC and the fact that such patients are often 
treated  with  surgery  instead  of  drug  therapies.  After  further  consideration  of  the  trial  design  and  the 
limited  number  of  patients,  there  was  a  reallocation  of  resources  and  Rexahn  reprioritized  Archexin  to 
pursue studies in pancreatic cancer.   

In  October  2006,  we  announced  the  conclusion  of  the  Phase  I  clinical  trial  of  Archexin.    We 
currently estimate that the Phase IIa trials for pancreatic cancer patients will be completed in the first half 
of 2012 and will require approximately $500,000. 

Serdaxin® (RX-10100)  

Serdaxin is an extended release formulation of clavulanic acid, which is an ingredient present in 
antibiotics approved by the FDA. We are currently developing Serdaxin for the treatment of depression 
and neurodegenerative disorders. We have recently concluded a Phase IIa proof of concept clinical trial 
for major depressive disorder (“MDD”), with Serdaxin. The proof-of-concept, randomized, double blind, 
placebo  controlled  and  dose  ranging  (5  mg,  10  mg,  15  mg  administered  twice  daily)  Phase  IIa  clinical 
trial enrolled 77 MDD patients at multiple sites in the United States.  No statistical difference was seen 
between  the  three  doses  and  the  placebo  on  the  Montgomery-Asberg  Depression  Rating  Scale 
(“MADRS”).  A high dropout rate of non-responders in the placebo group contributed to a higher-than-
expected response for the placebo-treated subjects that completed the study.  We believe this high dropout 
rate may have contributed to the absence of statistical significance.  In our ad hoc analysis, results from 
the Phase IIa clinical trial showed that patients suffering from MDD responded most positively to the 5 
mg dose of the drug, and supported proceeding to a Phase IIb clinical trial. In the subgroup analysis, the 
study  showed  that  patients  with  severe  MDD  taking  5  mg  of  Serdaxin  had  significant  improvement  in 
MADRS, scores after 8 weeks of treatment, compared to the placebo group. Among the 77 patients, 53 
patients  were  classified  as  having  severe  MDD.  Of  the  14  patients  treated  with  5  mg  of  Serdaxin, 
MADRS scores improved by 55.6%, compared to only 34.0% in the placebo group (n = 14), which was 

29 

 
 
statistically  significant  (p=0.041)  on  an  intent  to  treat  basis.  In  addition,  64.3%  of  patients  with  severe 
MDD treated with the 5 mg of Serdaxin were considered “Responders” compared to 28.6% in the placebo 
group (p=0.0581). A “Responder” is a patient with a change from baseline MADRS score of greater than 
or  equal  to  50%  after  treatment.  Additionally,  42.9%  of  patients  in  the  treatment  group  at  5  mg  of 
Serdaxin  were  in  remission  with  a  MADRS  score  of  less  than  or  equal  to  12  after  eight  weeks  of 
treatment,  versus  14.3%  in  the  placebo  group  (p=0.209).  During  the  trial  there  were  no  reports  of  side 
effects that are commonly linked to currently marketed antidepressant drugs, such as selective serotonin 
uptake  inhibitors,  (“SSRI”),  serotonin-norepinephrine  reuptake  inhibitors,  (“SNRI”),  and  tricyclic 
antidepressants  (“TCA”).  The  5  mg  Serdaxin-treated  group  (20  adverse  events)  reported  40%  fewer 
adverse events than the placebo group (36 adverse events). In addition, the 5 mg Serdaxin-treated group 
reported a lower dropout rate by week 2 of 4.8% compared to 9.1% in the placebo group, and by week 8 
the drop-out rate for the Serdaxin group was only 14.3% compared to 59.1% in the placebo group. Pre-
clinical studies suggest that Serdaxin may have an inverted, U-shape dose-response curve. This inverted, 
dose-response relationship may explain the observation in the Phase IIa trial of a more positive response 
in  patients  taking  the  lowest  dose.  Due  to  this  phenomenon,  higher  doses  of  Serdaxin  may  not  be 
effective,  suggesting  an  additional  potential  benefit  with  respect  to  the  risk  of  overdose  problems 
prevalent  in  other  psychogenic  medications.  A  Phase  IIb  trial  for  MDD  with  lower  doses  started 
recruiting patients in early 2011. We are also currently planning the Phase II clinical trial for Parkinson’s 
disease(“PD”), with Serdaxin and have submitted the protocol for this study to the FDA. 

We currently estimate that the Phase IIb MDD studies will require $7,100,000 through the end of 
2012. Phase II clinical trials for the use of Serdaxin for PD are being developed. We currently estimate 
PD studies will require $900,000 through the end of 2012.  

Zoraxel™ (RX-10100)  

We are developing Zoraxel for treatment of erectile dysfunction. Zoraxel is an immediate release 
formulation of clavulanic acid, the same active ingredient found in our product candidate Serdaxin. The 
Phase IIa proof of concept clinical trial of Zoraxel is complete with positive results and the Phase IIb trial 
will commence in 2011. Rexahn’s decision to move forward with the Phase IIb trial is supported by data 
from the Phase IIa proof  of concept, randomized,  double blind, placebo controlled and dose ranging (5 
mg, 10 mg, 15 mg) study of 39 erectile dysfunction patients (ages of 18 to 65) treated with Zoraxel. The 
Phase  IIa  study  was  completed  in  May  2009  and  demonstrated  that  Zoraxel  consistently  improved 
International Index of Erectile Function, (“IIEF”), scores of treated subjects. The Phase IIa study results 
showed  treatment  with  15mg  of  Zoraxel  at  week  8  improving  subjects’  IIEF-EF  scores by  6.5,  a  value 
obtained from the changes from the baseline between scores of 15 mg of Zoraxel (5.3) and the placebo 
group  (-1.2).  Furthermore,  the  study  showed  among  treated  subjects a  dose  dependent  treatment  effect 
with improved erectile function and quality of life measures. The study also showed Zoraxel to be well 
tolerated  in  the  patients  in  the  study  with  no  serious  adverse  events  reported.  To  examine  the  clinical 
relevance of Zoraxel as an erectile dysfunction drug, an “effect size” analysis has been conducted. Effect 
size (“ES”) is a data analysis index developed by Dr. Jacob Cohen of New York University and is derived 
from the improvement in IIEF mean score for the treatment group minus the improvement in IIEF mean 
score  of  the  placebo  group  over  the  treatment  period,  divided  by  the  standard  deviation  of  the  entire 
sample  at  baseline.  An  ES  value  greater  than  0.80 is  deemed “a  considerable  change”  under  the  ES 
criteria.  The  ES  for  IIEF-EF  and  IIEF-intercourse  satisfaction  indices  of  Zoraxel  (2.59  and  0.88, 
respectively) were larger than 0.80, suggesting a considerable change in sexual experiences in Zoraxel-
treated patients based on the ES criteria. The Phase IIb study is designed to assess Zoraxel’s efficacy in 
approximately  225  male  subjects,  ages  18  to  65,  with  ED.  The  double  blind,  randomized,  placebo-
controlled,  12-week  study  will  include  IIEF,  Sexual  Encounter  Profile,  or  SEP,  2  (Penetration)  &  3 
(Sexual  Intercourse)  survey,  as  primary  endpoints  with  25  and  50  mg  doses.  The  Phase  IIb  study  is 
expected to begin in the second half of 2011 and the preliminary data is expected to be available in 2012, 

30 

 
subject to the absence of any objection of the FDA to the Phase IIb trial we developed for Zoraxel. The 
study will be conducted at multiple sites in the United States.  

We currently estimate that these Phase IIb studies will require approximately $3,000,000 through 

the end of 2012. 

Pre-clinical Pipeline 

On September 21, 2009, we closed on a $3.5 million private placement of our common stock with 
Teva pursuant to a securities purchase agreement.  Contemporaneous with the execution and delivery of 
this agreement, the parties executed a research and exclusive license option agreement (RELO) pursuant 
to  which  we  are  required  to  use  $2,000,000  of  the  gross  proceeds  of  the  issuance  and  sale  of  shares  to 
Teva to fund a research and development program for the pre-clinical development of RX-3117.  As of 
December  31,  2010, 
restricted  cash 
equivalents.  Pursuant  to  the  securities  purchase  agreement,  as  amended,  Teva  purchased  an  additional 
$3.95 million of our common stock in a private placement that closed on January 19, 2011.  Pursuant to 
the amended securities purchase agreement, Teva has the option to acquire additional shares of common 
stock having a value of $750,000, which investment may be made by Teva, at its sole discretion, upon 
satisfactory  completion  by  Rexahn  of  an  exploratory  early-stage  clinical  study  of  the  compound  RX-
3117, which study shall be in the location and have protocols that are approved by Teva. 

remaining  of  $351,893 

the  proceeds 

included 

in 

is 

During  the  fourth  quarter  of  2009,  research  and  development  work  began  on  the  RX-3117 
research and development program, which continued throughout 2010.  These compounds may be entered 
into exploratory clinical trials in 2011.   

RX-5902  is  in  a  late-stage  preclinical  development  and  the  next  scheduled  program  for  this 
compound  is  a  pre-clinical  toxicology  study  required  prior  to  submission  of  an  IND application  to  the 
FDA.  RX-8243, RX-1792, RX-0047-Nano, RX-0201-Nano, and Nano-polymer Anticancer Drugs are in 
a  preclinical  stage  of  development.  The  estimated  cost  to  complete  pre-clinical  toxicology  and  Phase  I 
clinical trials is estimated to be approximately $1,500,000 per each compound. 

The conduct of the clinical trial and toxicology studies described above are being accomplished in 
conjunction with third-party clinical research organizations at external locations.  This business practice is 
typical for the pharmaceutical industry and companies like us.  As a result, the risk of completion or delay 
of  these  studies  is  not  within  our  direct  control  and  a  program  delay  may  occur  due  to  circumstances 
outside our control.  A delay in any of these programs may not necessarily have a direct impact on our 
daily  operations.  However,  to  the  extent  that  a  delay  results  in  additional  cost  to  us,  a  higher  than 
expected expense may result. 

We will need to raise additional money through debt and/or equity offerings in order to continue 
to develop our drug candidates.  If we are not able to raise sufficient additional money, we will have to 
reduce our research and development activities.  We will first reduce research and development activities 
associated with our preclinical compounds.  To the extent necessary, we will then reduce our research and 
development activities related to some or all of our clinical drugs. 

. 

Liquidity and Capital Resources  

Operating Activities 

31 

 
 
 
Cash  used  in  operating  activities  was  $6,986,598  for  the  year  ended  December  31,  2010.    The 
operating cash flows during the year ended December 31, 2010 reflect our net loss of $14,022,107 and a 
net increase of cash components of working capital and non-cash charges totaling $7,035,509.  Cash used 
in operating activities was $5,146,845 for the year ended December 31, 2009. 

Cash used in investing activities of $660,039 for the year ended December 31, 2010, consisted of 
purchases  of  marketable  securities  and  equipment  of  $2,353,960  and  $5,246,  respectively,  offset  by 
$75,000 from proceeds received from the sale of marketable securities, and a reduction of restricted cash 
equivalents of $1,624,167.  Cash provided by investing activities for the year ended December 31, 2009 
was $1,341,825.  

Cash  provided  by  financing  activities  of  $12,688,844  for  the  year  ended  December  31,  2010 
consisted of net proceeds of $3,263,376 from the exercise of stock warrants, $107,240 from the exercise 
of  stock  options,  and  $9,318,228  from  the  issuance  of  6,666,667  shares  of  common  stock  to  investors.  
The investors were also issued warrants to purchase 2,000,000 shares of common stock.  Cash provided 
by financing activities was $10,733,922 for the year ended December 31, 2009. 

Financings 

We  have  financed  our  operations  since  inception primarily  through  equity  and  convertible  debt 
financings and interest income from investments of cash and cash equivalents.  During fiscal year 2010, 
we had a net increase in cash and cash equivalents of $5,042,207.  The increase resulted primarily from 
cash  provided  by  financing  activities  of  $12,688,844,  offset  by  cash  used  in  operating  and  investing 
activities of $6,986,598 and $660,039, respectively.   

On  June  5,  2009,  the  Company  closed  on  a  purchase  agreement  to  issue  2,857,143  shares  of 
common stock at a price of $1.05 per share to an institutional investor for gross proceeds of $3,000,000 
and incurred $289,090 of stock issuance costs.  The investor was also issued: 

1) Series I warrants to purchase 2,222,222 shares of common stock at a purchase price of $1.05 per 

share at any time before September 3, 2009; 

2) Series II warrants to purchase 1,866,666 shares of common stock at a purchase price of $1.25 per 

share at any time from December 3, 2009 to June 5, 2012; and 

3) Series III warrants to purchase 1,555,555 shares of common stock at a purchase price of $1.50 per 

share at any time from December 3, 2009 to June 5, 2014. 

These  warrants  have  been  valued  at  $3,328,937  and  recorded  as  warrant  liabilities.    The  closing 
costs included 142,857 warrants valued at $122,257 and were recorded as a financing expense. Series I 
warrants  to  purchase  2,222,222  shares  of  common  stock  at  a  purchase  price  of  $1.05  per  share  have 
expired. 

On September 21, 2009, the Company issued 3,102,837 shares of common stock at a purchase price 
of $1.13 per share to Teva for total net proceeds of $3,371,340, which include $128,659 of stock issuance 
costs.  

On  October  23,  2009,  the  Company  closed  on  a  purchase  agreement  to  issue  6,072,383  shares  of 
common stock at a price of $0.82 per share to five institutional investors for gross proceeds of $5,000,000 
less  $351,928  of  stock  issuance  costs.    The  investors  were  also  issued  warrants  to  purchase  2,125,334 
shares of common stock at a purchase price of $1.00 per share, exercisable on or after the date of delivery 
until the five-year anniversary.  These warrants have been valued at $1,012,934 and recorded as warrant 

32 

 
 
 
 
 
 
liabilities.    The  closing  costs  included  245,932  warrants  valued  at  $101,693  and  were  recorded  as  a 
financing expense.  

On  June  30,  2010,  the  Company  closed  on  a  purchase  agreement  to  issue  6,666,667  shares  of 
common  stock  at  a  price  of  $1.50  per  share  to  an  institutional  investor  for  net  proceeds  of  $9,318,228 
which  includes  $681,772  of  stock  issuance  costs.    The  investors  were  also  issued  warrants  to  purchase 
2,000,000 shares of common stock at a purchase price of $1.90 per share, exercisable on or after the date 
of delivery until the five-year anniversary.  There warrants have been valued at $1,800,800 and recorded 
in  additional  paid-in-capital.    The  closing  costs  included  200,000  warrants,  valued  at  $180,080  and 
recorded as a financing expense. 

For  the  foreseeable  future,  we  will  have  to  fund  all  of  our  operations  and  capital  expenditures 
from the net proceeds of equity and debt offerings we may make, cash on hand, licensing fees and grants.  
Although we expect to have to pursue additional financing, there can be no assurance that we will be able 
to secure financing when needed or obtain such financing on terms satisfactory to us, if at all, or that any 
additional funding we do obtain will be sufficient to meet our needs in the long term.  If we are not able to 
raise  sufficient  additional money,  we  will  have  to  reduce  our  research  and  development  activities.    We 
will first reduce research and development activities associated with our preclinical compounds.  To the 
extent necessary, we will then reduce our research and development activities related to some or all of our 
clinical drugs. 

Contractual Obligations   

We  have  contracted  with  various  vendors  to  provide  research  and  development  services.  The 
terms  of  these  agreements  usually  require  an  initiation  fee  and  monthly  or  periodic  payments  over  the 
term of the agreement, ranging from 2 months to 36 months. The costs to be incurred are estimated and 
are  subject  to  revision.  As  of  December  31,  2010,  the  total  contract  value  of  these  agreements  was 
approximately  $17,422,893  and  we  made  payments  totaling  $4,353,620  under  the  terms  of  the 
agreements.    All  of  these  agreements  may  be  terminated  by  either  party  upon  appropriate  notice  as 
stipulated in the respective agreements. 

On September 9, 2010, we and three of our key executives entered into Amended and Restated 
Employment  Agreements.    The  Amended  and  Restated  Employment  Agreements  replace  the  prior 
employment  contracts  entered  into  on  August  10,  2009.   We  entered  into  the  Amended  and  Restated 
Employment Agreements in order to provide the key executives with: (i) an automatic one year renewal 
upon  the  expiration  of  the  initial  three  year  term  and  upon  each  consecutive  year  term  unless  such 
employment  with  the  Company  is  terminated  earlier  by  the  Company  or  the  executives;  (ii)  an  annual 
base salary adjustment for inflation as determined by the Consumer Price Index subject to review by the 
Company’s Compensation Committee; (iii) an increase in the Company provided life insurance coverage 
from an amount equal to two times the executive’s annual base salary to an amount equal to four times 
the executive’s annual base salary; and (iv) a one-time cash payment, subject to applicable withholding 
requirements  under  applicable  state  and  federal  law,  in  an  amount  equal  to  the  executive’s  increased 
income  tax  costs  as  a  result  of  payments  made  to  the  executive  by  the  Company  under  the  change  of 
control provisions of the Amended and Restated Employment Agreement. Other than these changes, the 
new  contracts  have  substantially  similar  terms  to  the  executives’  prior  employment  agreements.    The 
agreements result in annual commitments of $200,000, $350,000 and $250,000, respectively. 

On  June  22,  2009,  we  entered  into  a  License  Agreement  with  Korea  Research  Institute  of 
Chemical Technology (KRICT) to acquire the rights to all intellectual properties related to Quinoxaline-
Piperazine  derivatives  that  were  synthesized  under  a  Joint  Research  Agreement.    The  initial  license  fee 

33 

 
 
 
 
 
 
 
was $100,000, all of which was paid as of December 31, 2009.  The agreement with KRICT calls for a 
one-time  milestone  payment  of  $1,000,000  within  30  days  after  the  first  achievement  of  marketing 
approval  of  the  first  commercial  product  arising  out  of  or  in  connection  with  the  use  of  KRICT’s 
intellectual properties. 

On June 29, 2009, we signed a five year lease for 5,466 square feet of office space in Rockville, 
Maryland commencing on June 29, 2009.  The lease requires annual base rents of $76,524 with increases 
over the next five years. Under the leasing agreement, we pay our allocable portion of real estate taxes 
and common area operating charges.  We paid $108,418, and $38,262 for rent under this lease in the years 
ending December 31, 2010 and 2009, respectively. 

Future rental payments over the next five years and thereafter are as follows: 

2011 
2012 
2013 
2014 

           $148,593 
158,835 
162,806 
  82,408 
           $552,642 

In connection with the lease agreement, we issued a letter of credit of $100,000 in favor of the 
lessor.    We  have  restricted  cash  equivalents  of  the  same  amount  for  the  letter  of  credit.    On  August  2, 
2010, the letter of credit was reduced to $50,000 per the lease agreement. 

On  September  21,  2009,  we  closed  on  a  securities  purchase  agreement  with  Teva.  
Contemporaneous with the execution and delivery of this agreement, the parties executed a research and 
exclusive  license  option  agreement  (RELO)  pursuant  to  which  we  received  $2,000,000  of  the  gross 
proceeds of the issuance and sale of shares to Teva to fund a research and development program for the 
pre-clinical  development  of  RX-3117. At  December 31,  2010,  we  had  proceeds  remaining  of  $351,893 
and have included this amount in restricted cash equivalents.  We will be eligible to receive royalties on 
net sales of RX-3117 worldwide.  Research and development work began on the RX-3117 research and 
development program began in the fourth quarter of 2009, and continued throughout 2010. 

On June 28, 2010, we signed a one year renewal to use lab space commencing on July 1, 2010.  

The lease requires monthly rental payments of $4,554. 

We  established  a  401(k)  plan  for  its  employees  where  we  match  100%  of  the  first  3%  of  the 
employee’s  deferral  plus  50%  of  an  additional  2%  of  the  employee’s  deferral.    Expense  related  to  this 
matching  contribution  aggregated  $65,019,  and  $49,519  for  the  years  ended  December  31,  2010,  and 
2009, respectively. 

34 

 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
Current and Future Financing Needs 

We  have  incurred  negative  cash  flow  from  operations  since  we  started  our  business.    We  have 
spent, and expect to continue to spend, substantial amounts in connection with implementing our business 
strategy,  including  our  planned  product  development  efforts,  our  clinical  trials,  and  our  research  and 
development efforts.  Based on our current plans and our capital resources, we believe that our cash and 
cash equivalents will be sufficient to enable us to meet our minimum planned operating needs through the 
end of 2011, which would entail focusing our resources on Phase II clinical trials of Archexin, Serdaxin 
and Zoraxel.  Through the end of 2011, we expect to spend a minimum of approximately $8.6 million on 
clinical  development  for  Phase  II  clinical  trials  of  Archexin,  Serdaxin  and  Zoraxel  (including  our 
commitments  described  under  “Contractual  Commitments”  of  this  Item 6),  $5.8  million  on  the 
development  of  our  pre-clinical  pipeline,  $4.1  million  on  general  corporate  expenses,  and  $200,000  on 
facilities  rent.    We  will  need  to  seek  additional  financing  to  implement  and  fund  other  drug  candidate 
development, clinical trial and research and development efforts to the maximum extent of our operating 
plan, including in-vivo animal and pre-clinical studies, Phase II clinical trials for new product candidates, 
as well as other research and development projects.  If we are not able to secure additional financing, we 
will not be able to implement and fund the research and development. 

However, the actual amount of funds we will need to operate is subject to many factors, some of 

which are beyond our control.  These factors include the following: 

• 

• 

• 

• 

the progress of our product development activities; 

the number and scope of our product development programs; 

the progress of our pre-clinical and clinical trial activities; 

the  progress  of  the  development  efforts  of  parties  with  whom  we  have  entered  into 
collaboration agreements; 

•  our  ability  to  maintain  current  collaboration  programs  and  to  establish  new  collaboration 

arrangements; 

• 

the costs involved in prosecuting and enforcing patent claims and other intellectual property 
rights; and 

• 

the costs and timing of regulatory approvals. 

Impact of Inflation 

To date inflationary factors have not had a significant effect on our operations. 

Off-Balance Sheet Arrangements 

We do not have any off-balance sheet arrangements.   

35 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
Item 7A.  Quantitative and Qualitative Disclosures About Market Risk. 

A smaller reporting company is not required to provide information required by this Item. 

Item 8.  Financial Statements and Supplementary Data. 

Our  financial  statements  and  financial  statement  schedule  and  the  Report  of  Independent 
Registered Public Accounting Firm thereon filed pursuant to this Item 8 have been amended and can be 
found beginning on page F-1 of Form 10-K/A immediately following this document. 

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.  Under  the  supervision  and  with  the 
participation of our management, including our Chief Executive Officer and Chief Financial Officer, we 
evaluated  the  effectiveness  of  the  design  and  operation  of  our  disclosure  controls  and  procedures  (as 
defined  in  Rule  13a-15(e)  and  15d-15(e)  under  the  Securities  Exchange  Act  of  1934  (the  “Exchange 
Act”)) as of the end of the period covered by this report. Based upon that evaluation, our Chief Executive 
Officer and Chief Financial Officer concluded that our disclosure controls and procedures as of the end of 
the period covered by this report were effective such that the information required to be disclosed by us in 
reports  filed  under  the  Securities  Exchange  Act  of  1934  is  (i) recorded,  processed,  summarized  and 
reported  within  the  time  periods  specified  in  the  SEC’s  rules  and  forms  and  (ii) accumulated  and 
communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as 
appropriate  to  allow  timely  decisions  regarding  disclosure.  A  controls  system  cannot  provide  absolute 
assurance, however, that the objectives of the controls system are met, and no evaluation of controls can 
provide absolute assurance that all control issues and instances of fraud, if any, within a company have 
been detected. 

Changes  in  Internal  Control  Over  Financial  Reporting.    During  the  most  recent  quarter  ended 
December 31, 2010, there has been no change in our internal control over financial reporting (as defined 
in Rule 13a-15(f) and 15d-15(f) under the Exchange Act) ) that has materially affected, or is reasonably 
likely  to  materially  affect,  our  internal  control  over  financial  reporting,  except  for  hiring  additional 
accounting  personnel  and  bringing  previously  outsourced  administrative  accounting  functions  in-house, 
and formalizing the process to ensure timely adoption of accounting guidance with respect to non-routine 
transactions  These control improvements were implemented to address a material weakness identified by 
management 

36 

 
 
 
 
 
 
 
 
 
 
 
 
MANAGEMENT’S REPORT ON INTERNAL CONTROL OVER FINANCIAL REPORTING 

Our  management  is  responsible  for  establishing  and  maintaining  adequate  internal  control  over 
financial  reporting  (as  defined  in  Rule 13a-15(f)  under  the  Exchange  Act).    Our  internal  control  over 
financial  reporting  is  a  process  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 and includes those policies and procedures that:   

• 

• 

• 

Pertain  to  the  maintenance  of  records  that,  in  reasonable  detail,  accurately  and 
fairly reflect the transactions and the dispositions of the assets of the 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 receipts and expenditures of the Company are being 
made  only  in  accordance  with  authorization  of  management  and  the  board  of 
directors of the Company; and 

Provide  reasonable  assurance  regarding  prevention  or  timely  detection  of 
unauthorized  acquisition,  use,  or  disposition  of  the  Company’s  assets  that  could 
have a material effect on the financial statements.   

Because  of  its  inherent  limitations,  internal  control  over  financial  reporting  may  not  prevent  or 
detect misstatements.  Also, projections of any evaluations of effectiveness to future periods are subject to 
risk that controls may become inadequate because of changes in conditions or because of declines in the 
degree of compliance with the policies or procedures.   

Our management, with the participation of the Chief Executive Officer and Chief Financial Officer, 
assessed the effectiveness of the Company’s internal control over financial reporting as of December 31, 
2009. In making this assessment, the Company’s management used the criteria set forth by the Committee 
of  Sponsoring  Organizations  of  the  Treadway  Commission  (COSO)  in  Internal  Control-Integrated 
Framework.   

A  material  weakness  is  a  deficiency,  or  combination  of  deficiencies,  in  internal  control  over 
financial reporting, such that there is a reasonable possibility that a material misstatement of a company’s 
annual or interim financial statements will not be prevented or detected on a timely basis.   

In  connection  with  management’s  assessment  of  our  internal  control  over  financial  reporting  as 
required  by  Section  404  of  the  Sarbanes-Oxley  Act  of  2002,  we  identified  a  material  weakness  in  our 
internal control over financial reporting as of December 31, 2009.  We had not designated or otherwise 
maintained adequate controls to ensure that we adopted accepted accounting policies with respect to non-
routine  matters,  such  as  the  accounting  for  warrants  or  the  anti-dilution  make  whole  provisions  on  our 
common stock.  In particular, we concluded that FASB ASC Topic 480, “Distinguishing Liabilities from 
Equity,” had not been applied properly.  As a result, as disclosed in the Explanatory Note to this Form 10-
K  and  in  Note  2  to  our  financial  statements  included  in  this  Form  10-K,  we  restated  our  financial 
statements as of and for the fiscal year ended December 31, 2009, and as of and the fiscal quarters ended 
March 31, June 30, and September 30, 2010. 

Due to the weakness noted, management has concluded that we did not maintain effective internal 
control  over  financial  reporting  as  of  December  31,  2009.    The  above  weakness  and  resulting 
misstatement  are  believed  to  be  inadvertent  and  unintentional.    In  addition,  we  have  implemented 
remedial  measures  in  order  to  improve  and  strengthen  our  internal  control  over  financial  reporting  and 

37 

 
 
 
 
 
 
 
 
 
 
 
avoid  future  misstatements  of  our  financial  statements.    During  the  last  quarter  of  2010,  the  remedial 
measures we have implemented include the following: 

•  We have designed new controls to help ensure that we adopt new accounting guidance with 

respect to non-routine transactions in a timely manner 

•  We  have  hired  additional  accounting  personnel  and  brought  previously  outsourced 
administrative  accounting  functions  in-house  to  ensure  additional  continuity  among  all 
company transactions and accounting functions. 

We  are  monitoring  the  effectiveness  of  these  measures,  and  may  take  further  action  as  we  deem 
appropriate to further strengthen our internal control over financial reporting.  The remediation measures 
noted above will be subject to our internal control assessment, testing, and evaluation process.  However, 
we  do  not  expect  that  our  disclosure  controls  and  procedures  or  our  internal  control  over  financial 
reporting  will  prevent  all  error  and  all  fraud.    A  control  system,  no  matter  how  well  designed  and 
operated,  can  provide  only  reasonable  assurance  that  the  objectives  of  the  control  system  are  met.  
Because of the inherent limitations in all internal control systems, no evaluation of controls can provide 
absolute assurance that all control issues and instances of fraud, if any, have been or will be detected. 

Based  on  our  evaluation,  and  the  remedial  measures  described  above,  our  management,  with  the 
participation of the Chief Executive Officer and Chief Financial Officer, concluded that, as of December 
31, 2010, our internal control over financial reporting was effective.   

Management  assessment  of  the  effectiveness  of  the  Company’s  internal  control  over  financial 
reporting  has  been  audited  by  ParenteBeard  LLC,  an  independent  registered  public  accounting  firm.  
ParenteBeard LLC has issued an attestation report on the effectiveness of the Company’s internal control 
over financial reporting, which appears herein. 

38 

 
 
 
 
 
 
 
 
 
Report of Independent Registered Public Accounting Firm 
on Internal Control Over Financial Reporting 

To the Board of Directors 
Rexahn Pharmaceuticals, Inc. 
Rockville, Maryland 

We have audited Rexahn Pharmaceuticals, Inc. (the “Company”) internal control over financial reporting 
as of December 31, 2010, based on criteria established in Internal Control ‐ Integrated Framework issued 
by the Committee of Sponsoring Organizations of the Treadway Commission (COSO).  Rexahn 
Pharmaceuticals, Inc.’s management is reasonable for maintaining effective internal control over 
financial reporting and for its assessment of the effectiveness of internal control over financial reporting 
included in the accompanying Management’s Report on Internal Control Over Financial Reporting.  Our 
responsibility is to express and opinion on the Company’s internal control over financial reporting based 
on our audit. 

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight 
Board (United States).  Those standards require that we plan and perform the audit to obtain reasonable 
assurance about whether effective internal control over financial reporting was maintained in all 
material respects.  Our audit of internal control over financial reporting included obtaining an 
understanding of internal control over financial reporting, assessing the risk that a material weakness 
exists, and testing and evaluating the design and operating effectiveness of internal control based on 
the assessed risk.  Our audit also included performing such other procedures as we considered 
necessary in the circumstances.  We believe that our audit provides a reasonable basis for our opinion. 

A company’s internal control over financial reporting is a process 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.  A company’s internal 
control over financial reporting includes those policies and procedures that (1) pertain to the 
maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and 
dispositions of the assets of the company; (2) proved reasonable assurance that transactions are 
recorded as necessary to permit preparation of financial statements in accordance with generally 
accepted accounting principles, and that receipts and expenditures of the company are being made only 
in accordance with authorizations of management and directors of the company; and (3) provide 
reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or 
disposition of the company’s assets that could have a material effect on the financial statements. 

Because of its inherent limitations, internal control over financial reporting may not prevent or detect 
misstatements.  Also, projections of any evaluation of effectiveness to future periods are subject to the 
risk that controls may become inadequate because of changes in conditions, or that the degree of 
compliance with the policies or procedures may deteriorate. 

39 

 
 
 
 
 
 
 
 
 
 
Report of Independent Registered Public Accounting Firm 
on Internal Control Over Financial Reporting (continued) 

In our opinion, Rexahn Pharmaceuticals, Inc. maintained, in all material respects, effective internal 
control over financial reporting as of December 31, 2010, based on criteria established in Internal 
Control ‐ Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway 
Commission (COSO). 

We also have audited, in accordance with the standards of the Public Company Accounting Oversight 
Board (United States), the balance sheet of Rexahn Pharmaceuticals, Inc. as of December 31, 2010, and 
the related statements of operations, shareholders’ equity and comprehensive loss, and cash flows for 
the year then ended, and the cumulative from inception column in the statements of operations and 
cash flows for the year then ended, and our report dated March 16, 2011 expressed an unqualified 
opinion. 

/s/ PARENTEBEARD LLC 

New York, New York 
March 16, 2011 

40 

 
 
 
 
 
 
 
  
  
 
Item 9B.  Other Information. 

None. 

41 

 
 
 
PART III 

Item 10.  Directors, Executive Officers and Corporate Governance. 

The information to be provided under the caption “Election of Directors,” to be contained in the 
Definitive  Proxy  Statement  and  required  to  be  disclosed  in  this  Item  10,  is  hereby  incorporated  by 
reference in this Item 10; and the information to be provided under the caption “Section 16(a) Beneficial 
Ownership Reporting Compliance,” to be contained in the Definitive Proxy Statement and required to be 
disclosed pursuant to Section 16(a) of the Exchange Act, is also hereby incorporated by reference in this 
Item 9.   

Code of Ethics 

We  have  adopted  a  code  of  ethics  that  applies  to  our  principal  executive  officer,  principal 
financial  officer,  principal  accounting  officer  or  controller,  or  persons  performing  similar  functions.  
Rexahn’s Code of Ethics is posted on its website, which is located at www.rexahn.com.   

We  intend  to  satisfy  any  disclosure  requirement  regarding  an  amendment  to,  or  waiver  from,  a 
provision  of  this  code  of  ethics  by  posting  such  information  on  our  website,  at  the  address  specified 
above.   

Item 11.  Executive Compensation. 

The information to be provided under the caption “Executive Compensation and Other Matters,” 
to be contained in the Definitive Proxy Statement and required to be disclosed in this Item 11, is hereby 
incorporated by reference in this Item 11. 

Item 12.  Security  Ownership  of  Certain  Beneficial  Owners  and  Management  and  Related 
Stockholder Matters. 

The information to be provided under the captions “Equity Compensation Plan Information” and 
“Security  Ownership  of  Management  and  Certain  Security  Holders,”  each  to  be  contained  in  the 
Definitive  Proxy  Statement  and  required  to  be  disclosed  in  this  Item 12,  is  hereby  incorporated  by 
reference in this Item 12. 

Item 13.  Certain Relationships and Related Transactions; and Director Independence. 

Related Transactions 

The  information  to  be  provided  under  the  caption  “Certain  Relationships  and  Related 
Transactions,” to be contained in the Definitive Proxy Statement and required to be disclosed in this Item 
13, is hereby incorporated by reference in this Item 13.   

Item 14.  Principal Accounting Fees and Services. 

The information to be provided under the caption “Proposal 2 Ratification of the Appointment of 
the  Independent  Registered  Public  Accounting  Firm,  Fees,”  to  be  contained  in  the  Definitive  Proxy 
Statement and required to be disclosed in this Item 14, is hereby incorporated by reference in this Item 14.  

42 

 
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Item 15.  Exhibits, Financial Statement Schedules. 

(a)  The following documents are filed as a part of this Annual Report on Form 10-K:  

(1)  Financial Statements: 

  The financial statements that were filed on Form 10-K were amended and can be found on Form 
10-K/A immediately following this Form 10-K. 

(2)  Exhibits: 

The documents listed below are filed with this Annual Report on Form 10-K as exhibits or 
incorporated into this Annual Report on Form 10-K by reference as noted: 

Exhibit 
Number 
3.1. 

3.2. 

4.1. 

4.2 

4.3 

*10.1.1 

*10.1.2 

*10.1.3 

*10.2 

*10.3 

10.4 

*10.5 

Exhibit Description 

Amended and Restated Certificate of Incorporation, filed as Appendix G to the Company’s 
Definitive Proxy Statement on Schedule 14A (File No. 000-50590) dated April 29, 2005, is 
incorporated herein by reference. 
Amended and Restated Bylaws, filed as Exhibit 3.1 to the Company’s Current Report on 
Form 8-K filed on March 26, 2010, is incorporated herein by reference. 
Specimen Certificate for the Company’s Common Stock, par value $.0001 per share, filed as 
Exhibit 4.3 to the Company’s Registration Statement on Form S-8 (File No. 333-129294) 
dated October 28, 2005, is incorporated herein by reference. 
Form of Senior Debt Securities Indenture, filed as Exhibit 4.2 to the Company’s Registration 
Statement on Form S-3 dated July 30, 2008, is incorporated herein by reference. 
Form of Subordinated Debt Securities Indenture, filed as Exhibit 4.3 to the Company’s 
Registration Statement on Form S-3 dated July 30, 2008 is incorporated herein by reference.   
Rexahn Pharmaceuticals, Inc. Stock Option Plan, as amended, filed as Exhibit 4.4 to the 
Company’s Registration Statement on Form S-8 (File No. 333-129294) dated October 28, 
2005, is incorporated herein by reference. 
Form of Stock Option Grant Agreement for Employees, filed as Exhibit 4.5.1 to the 
Company’s Registration Statement on Form S-8 (File No. 333-129294) dated October 28, 
2005, is incorporated herein by reference. 
Form of Stock Option Grant Agreement for Non-Employee Directors and Consultants, filed as 
Exhibit 4.5.2 to the Company’s Registration Statement on Form S-8 (File No. 333-129294) 
dated October 28, 2005, is incorporated herein by reference. 
Employment Agreement, dated as of September 9, 2010, by and between Rexahn 
Pharmaceuticals, Inc. and C. H. Ahn, filed as Exhibit 10.1 to the Company’s Current Report 
on Form 8-K filed on September 10, 2010, is incorporated herein by reference. 
Employment Agreement, dated as of September 9, 2010, by and between Rexahn 
Pharmaceuticals, Inc. and T. H. Jeong, filed as Exhibit 10.3 to the Company’s Current Report 
on Form 8-K filed on September 10, 2010, is incorporated herein by reference. 
Lease Agreement, dated June 5, 2009, by and between Rexahn Pharmaceuticals, Inc. and The 
Realty Associates Fund V, L.P., filed as Exhibit 10.4 to the Company’s Quarterly Report on 
Form 10-Q for the quarterly period ended June 30, 2009, is incorporated herein by reference 
Employment Agreement, dated as of September 9, 2010, by and between Rexahn 
Pharmaceuticals, Inc. and Rakesh Soni, filed as Exhibit 10.2 to the Company’s Current Report 
on Form 8-K filed on September 10, 2010, is incorporated herein by reference. 

43 

 
 
 
  
 
 
 
  
  
 
  
  
  
 
  
  
     
   
  
 
 
 
10.6 

10.7 

10.8 

10.9 

10.10 

10.11 

10.12 

10.13 

10.14 

10.15 

10.16 

14 

16 

23 
24. 

31.1. 

31.2. 

Securities Purchase Agreement, dated as of May 19, 2009 by and between Rexhan 
Pharmaceuticals, Inc. and the purchaser signatory thereto, filed as Exhibit 10.1 to the 
Company’s Current Report on Form 8-K filed on May 20, 2009, is incorporated herein by 
reference. 
Form of Warrant for the Company’s Series I, II, and III Common Stock Purchase Warrants, 
filed as Exhibit 4.1 to the Company’s Current Report on Form 8-K filed on May 20, 2009, is 
incorporated herein by reference. 
Research and Exclusive License Option Agreement, dated as of June 26, 2009, by and 
between Rexahn Pharmaceuticals, Inc. and Teva Pharmaceutical Industries Limited, filed as 
Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on September 21, 2009, is 
incorporated herein by reference.  
Securities Purchase Agreement, dated as of June 26, 2009, by and between Rexahn 
Pharmaceuticals, Inc. and Teva Pharmaceutical Industries Limited (the “Teva Securities 
Purchase Agreement”), filed as Exhibit 10.2 to the Company’s Current Report on Form 8-K 
filed on September 21, 2009, and Amendment No. 1 to the Teva Securities Purchase 
Agreement, filed as Exhibit 10.3 to the Company’s Current Report on Form 8-K filed on 
September 21, 2009, are incorporated herein by reference. 
Securities Purchase Agreement, dated as of October 19, 2009, by and between Rexahn 
Pharmaceuticals, Inc. and the purchasers signatory thereto, filed as Exhibit 10.1 to the 
Company’s Current Report on Form 8-K, filed on October 20, 2009, is incorporated herein by 
reference. 
Form of Warrant for the Company’s Common Stock Purchase Warrants, filed as Exhibit 4.1 
to the Company’s Current Report on Form 8-K filed on October 20, 2009, is incorporated 
herein by reference. 
Securities Purchase Agreement, dated as of  June 28, 2010 by and between Rexahn 
Pharmaceuticals, Inc. and the purchasers signatory thereto, filed as Exhibit 10.1 to the 
Company’s Current Report on Form 8-K, filed on June 29, 2010, is incorporated herein by 
reference. 
Form of Warrant for the Company’s Common Stock Purchase Warrants, filed as Exhibit 4.1 
to the Company’s Current Report on Form 8-K filed on June 29, 2010, is incorporated herein 
by reference. 
Financial Statements of the Company as of March 31, 2010, and for the three months then 
ended, as restated. 
Financial Statements of the Company as of June 30, 2010, and for the three and six months 
then ended, as restated. 
Financial Statements of the Company as of September 30, 2010, and for the three and nine 
months then ended, as restated. 
Code of Ethics and Business Conduct, filed as Exhibit 14 to the Company’s Annual Report on 
10-K for the fiscal year ended December 31, 2008, filed on March 16, 2009, is incorporated 
herein by reference. 
Letter of Lazar Levine & Felix LLP dated February 27, 2009, filed as Exhibit 16.1 to the 
Company’s Amended Current Report on Form 8-K filed on March 2, 2009, is incorporated 
herein by reference. 
Consent of ParenteBeard LLC, independent registered public accounting firm.   
Power of Attorney 

Certification of Chief Executive Officer Pursuant to Rule 13a-14(a) or Rule 15d-14(a).  

Certification of Chief Financial Officer Pursuant to Rule 13a-14(a) or Rule 15d-14(a). 

44 

 
32.1 

32.2 

Certification of Chief Executive Officer of Periodic Report Pursuant to 18 U.S.C. 
Section 1350. 
Certification of Chief Financial Officer of Periodic Report Pursuant to 18 U.S.C. 
Section 1350. 

_______________________ 
* Management contract or compensation plan or arrangement.  

45 

 
  
 
 
SIGNATURES 

In accordance with the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the 
issuer has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized 
on this 16 day of March, 2011. 

REXAHN PHARMACEUTICALS, INC. 

By:  /s/ Chang H. Ahn 
Chang H. Ahn 
Chairman and Chief Executive Officer 

In accordance with the requirement of the Securities Exchange Act of 1934, this report has been 
signed on the 16 day of March, 2011 by the following persons on behalf of the issuer and in the 
capacities indicated: 

Name 

/s/ Chang H. Ahn* 
Chang H. Ahn 
/s/ Tae Heum Jeong* 
Tae Heum Jeong 

/s/ Peter Brandt* 
Peter Brandt 
/s/ David McIntosh* 
David McIntosh 
/s/ Charles Beever* 
Charles Beever 
/s/ Kwang Soo Cheong*  
Kwang Soo Cheong 
/s/ Richard Kivel* 
Richard Kivel 

Title 

and  Chief  Executive  Officer 

Chairman 
(Principal Executive Officer) 
Chief  Financial  Officer,  Secretary  and 
and 
Director 

(Principal  Financial 

Accounting Officer) 

Director 

Director 

Director 

Director 

Director 

* By: /s/ Tae Heum Jeong, Attorney-in Fact 

Tae Heum Jeong, Attorney-in-Fact** 

** By authority of the power of attorney filed as Exhibit 24 hereto.   

46 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
3.1. 

3.2. 

4.1. 

4.2 

4.3 

*10.1.1 

*10.1.2 

*10.1.3 

*10.2 

*10.3 

10.4 

*10.5 

10.6 

10.7 

10.8 

EXHIBIT INDEX 

Amended and Restated Certificate of Incorporation, filed as Appendix G to the Company’s 
Definitive Proxy Statement on Schedule 14A (File No. 000-50590) dated April 29, 2005, is 
incorporated herein by reference. 
Amended and Restated Bylaws, filed as Exhibit 3.1 to the Company’s Current Report on 
Form 8-K filed on March 26, 2010, is incorporated herein by reference. 
Specimen Certificate for the Company’s Common Stock, par value $.0001 per share, filed as 
Exhibit 4.3 to the Company’s Registration Statement on Form S-8 (File No. 333-129294) 
dated October 28, 2005, is incorporated herein by reference. 
Form of Senior Debt Securities Indenture, filed as Exhibit 4.2 to the Company’s Registration 
Statement on Form S-3 dated July 30, 2008, is incorporated herein by reference. 
Form of Subordinated Debt Securities Indenture, filed as Exhibit 4.3 to the Company’s 
Registration Statement on Form S-3 dated July 30, 2008 is incorporated herein by reference.   
Rexahn Pharmaceuticals, Inc. Stock Option Plan, as amended, filed as Exhibit 4.4 to the 
Company’s Registration Statement on Form S-8 (File No. 333-129294) dated October 28, 
2005, is incorporated herein by reference. 
Form of Stock Option Grant Agreement for Employees, filed as Exhibit 4.5.1 to the 
Company’s Registration Statement on Form S-8 (File No. 333-129294) dated October 28, 
2005, is incorporated herein by reference. 
Form of Stock Option Grant Agreement for Non-Employee Directors and Consultants, filed as 
Exhibit 4.5.2 to the Company’s Registration Statement on Form S-8 (File No. 333-129294) 
dated October 28, 2005, is incorporated herein by reference. 
Employment Agreement, dated as of September 9, 2010, by and between Rexahn 
Pharmaceuticals, Inc. and C. H. Ahn, filed as Exhibit 10.1 to the Company’s Current Report 
on Form 8-K filed on September 10, 2010, is incorporated herein by reference. 
Employment Agreement, dated as of September 9, 2010, by and between Rexahn 
Pharmaceuticals, Inc. and T. H. Jeong, filed as Exhibit 10.3 to the Company’s Current Report 
on Form 8-K filed on September 10, 2010, is incorporated herein by reference. 
Lease Agreement, dated June 5, 2009, by and between Rexahn Pharmaceuticals, Inc. and The 
Realty Associates Fund V, L.P., filed as Exhibit 10.4 to the Company’s Quarterly Report on 
Form 10-Q for the quarterly period ended June 30, 2009, is incorporated herein by reference 
Employment Agreement, dated as of September 9, 2010, by and between Rexahn 
Pharmaceuticals, Inc. and Rakesh Soni, filed as Exhibit 10.2 to the Company’s Current Report 
on Form 8-K filed on September 10, 2010, is incorporated herein by reference. 
Securities Purchase Agreement, dated as of May 19, 2009 by and between Rexhan 
Pharmaceuticals, Inc. and the purchaser signatory thereto, filed as Exhibit 10.1 to the 
Company’s Current Report on Form 8-K filed on May 20, 2009, is incorporated herein by 
reference. 
Form of Warrant for the Company’s Series I, II, and III Common Stock Purchase Warrants, 
filed as Exhibit 4.1 to the Company’s Current Report on Form 8-K filed on May 20, 2009, is 
incorporated herein by reference. 
Research and Exclusive License Option Agreement, dated as of June 26, 2009, by and 
between Rexahn Pharmaceuticals, Inc. and Teva Pharmaceutical Industries Limited, filed as 
Exhibit 10.1 to the Company’s Current Report on Form 8-K filed on September 21, 2009, is 
incorporated herein by reference.  

 
 
 
10.9 

10.10 

10.11 

10.12 

10.13 

10.14 

10.15 

10.16 

14 

16 

23 
24 
31.1 
31.2 
32.1 

32.2 

Securities Purchase Agreement, dated as of June 26, 2009, by and between Rexahn 
Pharmaceuticals, Inc. and Teva Pharmaceutical Industries Limited (the “Teva Securities 
Purchase Agreement”), filed as Exhibit 10.2 to the Company’s Current Report on Form 8-K 
filed on September 21, 2009, and Amendment No. 1 to the Teva Securities Purchase 
Agreement, filed as Exhibit 10.3 to the Company’s Current Report on Form 8-K filed on 
September 21, 2009, are incorporated herein by reference. 
Securities Purchase Agreement, dated as of October 19, 2009, by and between Rexahn 
Pharmaceuticals, Inc. and the purchasers signatory thereto, filed as Exhibit 10.1 to the 
Company’s Current Report on Form 8-K, filed on October 20, 2009, is incorporated herein by 
reference. 
Form of Warrant for the Company’s Common Stock Purchase Warrants, filed as Exhibit 4.1 
to the Company’s Current Report on Form 8-K filed on October 20, 2009, is incorporated 
herein by reference. 
Securities Purchase Agreement, dated as of  June 28, 2010 by and between Rexahn 
Pharmaceuticals, Inc. and the purchasers signatory thereto, filed as Exhibit 10.1 to the 
Company’s Current Report on Form 8-K, filed on June 29, 2010, is incorporated herein by 
reference. 
Form of Warrant for the Company’s Common Stock Purchase Warrants, filed as Exhibit 4.1 
to the Company’s Current Report on Form 8-K filed on June 29, 2010, is incorporated herein 
by reference. 
Financial Statements of the Company as of March 31, 2010, and for the three months then 
ended, as restated. 
Financial Statements of the Company as of June 30, 2010, and for the three and six months 
then ended, as restated. 
Financial Statements of the Company as of September 30, 2010, and for the three and nine 
months then ended, as restated. 
Code of Ethics and Business Conduct, filed as Exhibit 14 to the Company’s Annual Report on 
10-K for the fiscal year ended December 31, 2008, filed on March 16, 2009, is incorporated 
herein by reference. 
Letter of Lazar Levine & Felix LLP dated February 27, 2009, filed as Exhibit 16.1 to the 
Company’s Amended Current Report on Form 8-K filed on March 2, 2009, is incorporated 
herein by reference. 
Consent of ParenteBeard LLC, independent registered public accounting firm.   
Power of Attorney. 
Certification of Chief Executive Officer Pursuant to Rule 13a-14(a) or Rule 15d-14(a).  
Certification of Chief Financial Officer Pursuant to Rule 13a-14(a) or Rule 15d-14(a). 
Certification  of  Chief  Executive  Officer  of  Periodic  Report  Pursuant  to  18  U.S.C. 
Section 1350. 
Certification  of  Chief  Financial  Officer  of  Periodic  Report  Pursuant  to  18  U.S.C. 
Section 1350. 

_______________________ 
* Management contract or compensation plan or arrangement. 

 
 
 
UNITED STATES SECURITIES AND EXCHANGE COMMISSION 
Washington, D.C. 20549 

Form 10-K/A 
Amendment No. 1 

⌧ 

(cid:134) 

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE 
ACT OF 1934 
For the fiscal year ended December 31, 2010 

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: 001-34079 

Rexahn Pharmaceuticals, Inc. 

(Exact name of registrant as specified in its charter) 

Delaware 
(State or other jurisdiction of incorporation or 
organization) 

15245 Shady Grove Road, Suite 455 
Rockville, Maryland 
(Address of principal executive offices) 

11-3516358 
(I.R.S. Employer Identification No.) 

20850 
(Zip Code) 

(240) 268-5300 
(Registrant’s telephone number, including area code) 
Securities registered pursuant to Section 12(b) of the Exchange Act: 

Title of Each Class 
Common Stock, $.0001 par value per share

Name of Each Exchange on Which Registered
NYSE AMEX 

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

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities 

Act. Yes (cid:134)   No ⌧ 

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of 

the Exchange Act. Yes (cid:134)   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 Exchange Act 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 (cid:134) 

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, 
if  any,  every  Interactive  Data  File  required  to  be  submitted  and  posted  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 and post such files). Yes (cid:134)   No (cid:134) 

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained 
herein, and will not be contained, to the best of registrant’s knowledge, in definitive proxy or information statements 
incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K. (cid:134) 

 
 
 
  
 
  
 
  
 
  
  
     
     
  
  
 
  
 
 
 
 
 
 
 
Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated 
filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller 
reporting company” in Rule 12b-2 of the Exchange Act. (Check one): 

Large accelerated filer (cid:134)  Accelerated filer (cid:134) 

Non-accelerated filer (cid:134) 

Smaller reporting company 
⌧ 

(Do not check if a smaller reporting 
company) 

Indicate  by  check  mark  whether  the  registrant  is  a  shell  company  (as  defined  in  Rule  12b-2  of  the  Exchange 

Act). Yes (cid:134)   No ⌧ 

State the aggregate market value of the voting and non-voting common equity held by non-affiliates computed 
by reference to the price at which the common equity was last sold, or the average bid and asked price of such common 
equity,  as  of  the  last  business  day  of  the  registrant’s  most  recently  completed  second  fiscal  quarter:  As  of  June  30, 
2010,  the  aggregate  market  value  of  the  registrant’s  common  stock  held  by  non-affiliates  of  the  registrant  was 
$97,940,504 based on the closing price reported on NYSE Amex. 

Indicate the number of shares outstanding of each of the registrant’s classes of common stock, as of the latest 

practicable date: 

Class 

Outstanding at March 23, 2011 

Common Stock, $.0001 par value per share 

86,779,406 shares 

DOCUMENTS INCORPORATED BY REFERENCE 

Document 

Parts Into Which Incorporated 

Portions of the registrant’s Proxy Statement for the Annual 
Meeting of Stockholders to be held on June 6, 2011 

Part III 

 
 
 
 
  
  
  
 
 
 
 
  
  
 
 
  
  
 
 REXAHN PHARMACEUTICALS, INC. 

INDEX 

PART I 

Item 1A. 

  Risk Factors 

PART II 

Item 8. 

  Financial Statements and Supplementary Data 

PART III 

Item 15. 

  Exhibits, Financial Statement Schedules 

SIGNATURES 

PAGE

1 

11 

11 

12 

 
 
 
   
 
 
 
  
  
    
  
  
    
  
    
  
  
  
    
  
     
   
  
   
     
   
    
   
  
  
  
    
  
    
 
Explanatory Note – Amendment 

Rexahn Pharmaceuticals, Inc. (the “Company”) is filing this Amendment No. 1 on Form 10-K/A (this “Form 
10-K/A”) to the Company’s Annual Report on Form 10-K for the year ended December 31, 2010, which was originally 
filed with the Securities and Exchange Commission on March 16, 2011 (the “Original Filing”). 

The purpose of this Form 10-K/A is to provide additional disclosure in the footnotes contained in Item 8 and 
Item  15  of  the  Form  10-K  regarding  terms  of  certain  warrants  issued  by  the  Company  and  the  Company’s  (a)  total 
comprehensive loss, (b) uninsured cash balance and (c) diluted earnings per share and diluted shares outstanding. These 
revised footnote disclosures have no material impact on the financial statements contained in Item 8 and Item 15 of the 
Form 10-K.  Additionally,  this Form  10-K/A  revises a risk factor regarding timing of FDA approval  and  adds a  risk 
factor regarding marketing period exclusivity. 

Other than as described above, none of the financial statements or other disclosures in the Original Filing have 
been amended or updated.  Among other things, forward looking statements made in the Original Filing have not been 
revised to reflect events that occurred or facts that became known to the Company after the filing of the Original Filing, 
and such forward-looking statements should be read in their historical context. Accordingly, this Form 10-K/A should 
be  read  in  conjunction  with  the  Company’s  filings  with  the  Securities  and  Exchange  Commission  subsequent  to  the 
Original Filing.  As required by Rule 12b-15 under the Securities and Exchange Act of 1934, new certifications of our 
principal executive officer, principal financial officer and principal accounting officer are being filed as exhibits to this 
Form 10-K/A.  

Explanatory Note – Original Filing 

The Company has restated herein our financial statements for the fiscal year ended December 31, 2009, and 
the  quarters  ended  March  31,  June  30,  and  September  30,  2010  to  reflect  management’s  determination  that  the 
Company had misclassified warrants and a put feature on its common stock as equity. Management has determined that 
these instruments should have been classified as liabilities. 

The  Company’s  Original  Report  reflect  warrants  to  purchase  8,575,243  shares  of  the  Company’s  common 
stock as stockholders’ equity as of December 31, 2009. These warrant agreements contain a fundamental transaction 
provision in which the holders may opt for cash settlement upon the occurrence of a Rule 13e-3 transaction, and should 
have been classified as liabilities in accordance with ASC 480, “Distinguishing Liabilities from Equity” (“ASC 480”). 
In  addition,  these  warrants  were  determined  not  to  be  indexed  to  the  Company’s  stock,  and  therefore,  also  require 
liability classification in accordance with ASC 815, “Derivatives and Hedging” (“ASC 815”) The resulting impact of 
this accounting change is a decrease in the Company’s net loss of $1,569,151 for the year ended December 31, 2009, a 
decrease  in  the  Company’s  accumulated  deficit  of  $789,374  as  of  January  1,  2009,  an  increase  in  the  Company’s 
liabilities  of  $3,099,476  as  of  December  31  2009,  and  a  decrease  in  additional  paid-in  capital  of  $5,458,001  as  of 
December 31, 2009. The foregoing adjustments reflect non-cash items in the Company’s financial statements. 

The Company’s Original Report also included anti-dilution make whole provisions as stockholders’ equity as 
of  December  31,  2009.  On  December  18,  2007  and  March  20,  2008,  the  Company  entered  into  Securities  Purchase 
Agreements and extended anti-dilution make whole provisions on its common stock in the event the Company sells or 
issues  shares  below  the  effective  purchase  price  paid  by  these  investors.  The  investors  would  thereupon  receive 
additional  shares  in  a  ratio  outlined  in  the  Securities  Purchase  Agreement.  Management  has  determined  that  this 
provision is a written put and requires liability classification in accordance with ASC 480. The resulting impact of this 
accounting  change  is  a  decrease  in  the  Company’s  net  loss  of  $1,915,179  for  the  year  ended  December  31,  2009,  a 
decrease  in  the  Company’s  accumulated  deficit  of  $302,647  as  of  January  1,  2009,  an  increase  in  the  Company’s 
liabilities  of  $97,713  as  of  December  31,  2009,  and  a  decrease  in  additional  paid-in  capital  of  $2,315,539  as  of 
December 31, 2009. The foregoing adjustments reflect non-cash items in the Company’s financial statements. 

The  total  impact  of these accounting  changes  is  a decrease  in the  Company’s net  loss of $3,484,330 for  the 
year ended December 31, 2009, a decrease in the Company’s accumulated deficit of $1,092,021 as of January 1, 2009, 
an increase in the Company’s liabilities of $3,197,189 as of December 31, 2009, and a decrease in additional paid-in 
capital of $7,773,540 as of December 31, 2009. 

 
 
 
   
  
 
 
 
 
  
 
 
 
 
 
 
For a full description of the restatement, see Note 2 “Prior Period Adjustment” of the “Notes to the Financial 

Statements” that are included in Part II, Item 8 of this Form 10-K. 

The Company has concluded that there was a material weakness in internal control over financial reporting as 
of  December  31,  2009.  The  Company  has  implemented  remedial  measures  to  correct  this  material  weakness  as  of 
December 31, 2010. 

 
 
 
 
 
Item 1A. Risk Factors. 

PART I 

You should carefully consider the risks described below together with the other information included in this Form 10-
K/A. Our business, financial condition or results of operations could be adversely affected by any of these risks. If any 
of these risks occur, the value of our common stock could decline. 

We currently have no product revenues, have incurred negative cash flows from operations since inception, and will 
need to raise additional capital to operate our business. 

To date, we have generated no product revenues and have incurred negative cash flow from operations. Until 
we receive approval from the FDA and other regulatory authorities for our drug candidates, we cannot sell our drugs 
and will not have product revenues. Therefore, for the foreseeable future, we will have to fund all of our operations and 
capital expenditures from the net proceeds of equity or debt offerings we may make, cash on hand, licensing fees and 
grants. Through the end of 2011, we expect to spend approximately $8.6 million on clinical development for Phase II 
clinical trials of Archexin, Serdaxin and Zoraxel™, $5.8 million on the development of  preclinical compounds, $4.1 
million on general corporate expenses and approximately $200,000 on facilities rent. We will need to raise additional 
money through debt and/or equity offerings in order to continue to develop our drug candidates. If we are not able to 
raise sufficient additional money, we will have to reduce our research and development activities. We will first reduce 
research and development activities associated with our preclinical compounds. To the extent necessary, we will then 
reduce our research and development activities related to some or all of our clinical drugs. 

Additionally,  changes  may  occur  that  would  consume  our  existing  capital  at  a  faster  rate  than  projected, 
including  but  not  limited  to,  the  progress  of  our  research  and  development  efforts,  the  cost  and  timing  of  regulatory 
approvals and the costs of protecting our intellectual property rights. We may seek additional financing to implement 
and  fund  other  drug  candidate  development,  clinical  trial  and  research  and  development  efforts,  including  Phase  I 
clinical trials for other new drug candidates, as well as other research and development projects. 

We will need additional financing to continue to develop our drug candidates, which may not be available on 
favorable terms, if at all. If we are unable to secure additional financing in the future on acceptable terms, or at all, we 
may be unable to complete our planned pre-clinical and clinical trials or obtain approval of our drug candidates from 
the FDA and other regulatory authorities. In addition, we may be forced to reduce or discontinue product development 
or product licensing, reduce or forego sales and marketing efforts and forego attractive business opportunities in order 
to improve our liquidity to enable us to continue operations. Any additional sources of financing will likely involve the 
sale of our equity securities or securities convertible into our equity securities, which may have a dilutive effect on our 
stockholders. 

We are not currently profitable and may never become profitable. 

We have generated no revenues to date from product sales. Our accumulated deficit as of December 31, 2010 
and 2009 was $45,739,663 and $31,717,556, respectively. For the years ended December 31, 2010 and 2009, we had 
net losses of $14,022,107 and $2,903,098, respectively, partially as a result of expenses incurred through a combination 
of research and development activities related to the various technologies under our control and expenses supporting 
those activities. Even if we succeed in developing and commercializing one or more of our drug candidates, we expect 
to incur substantial losses for the foreseeable future and may never become profitable. We also expect to continue to 
incur significant operating and capital expenditures and anticipate that our expenses will increase substantially in the 
foreseeable future, based on the following considerations: 

· 

· 

· 

· 

continued pre-clinical development and clinical trials for our current and new drug candidates; 

efforts to seek regulatory approvals for our drug candidates; 

implementing additional internal systems and infrastructure; 

licensing in additional technologies to develop; and 

 
 
 
   
 
  
 
 
 
 
 
 
 
 
 
 
 
 
· 

hiring additional personnel. 

We  also  expect  to  continue  to  experience  negative  cash  flow  for  the  foreseeable  future  as  we  fund  our 
operating losses and capital expenditures. Until we have the capacity to generate revenues, we are relying upon outside 
funding resources to fund our cash flow requirements. 

We have a limited operating history. 

We  are  a  development-stage  company  with  a  limited  number  of  drug  candidates.  To  date,  we  have  not 
demonstrated  an  ability  to  perform  the  functions  necessary  for  the  successful  commercialization  of  any  of  our  drug 
candidates. The successful commercialization of our drug candidates will require us to perform a variety of functions, 
including, but not limited to: 

· 

· 

· 

· 

conducting pre-clinical and clinical trials; 

participating in regulatory approval processes; 

formulating and manufacturing products; and 

conducting sales and marketing activities. 

To date, our operations have been limited to organizing and staffing our company, acquiring, developing and 
securing our proprietary technology, drug candidate research and development and undertaking, through third parties, 
pre-clinical  trials  and  clinical  trials  of  our  principal  drug  candidates.  These  operations  provide  a  limited  basis  for 
assessment of our ability to commercialize drug candidates. 

We may not obtain the necessary U.S. or worldwide regulatory approvals to commercialize our drug candidates, and 
we cannot guarantee how long it will take for FDA to review applications for our drug candidates. 

We will need FDA approval to commercialize our drug candidates in the U.S. and approvals from the FDA-
equivalent regulatory authorities in foreign jurisdictions to commercialize our drug candidates in those jurisdictions. In 
order to obtain FDA approval of our drug candidates, we must submit to the FDA an NDA demonstrating that the drug 
candidate  is  safe  for  humans  and  effective  for  its  intended  use.  This  demonstration  requires  significant  research  and 
animal tests, which are referred to as pre-clinical studies, as well as human tests, which are referred to as clinical trials. 
Satisfaction of the FDA’s regulatory requirements typically takes many years, and depends upon the type, complexity 
and novelty of the drug candidate and requires substantial resources for research, development and testing. We cannot 
guarantee that any of our drug candidates will ultimately be approved by the FDA, if they will ultimately be reviewed 
on an expedited or priority basis by the FDA, or if an expedited or priority review will significantly shorten actual FDA 
review  time.  We  cannot  predict  whether  our  research  and  clinical  approaches  will  result  in  drugs  that  the  FDA 
considers  safe for humans  and  effective for  indicated  uses.  Two  of  our drug  candidates, Archexin  and  RX-0047,  are 
antisense oligonucleotide (ASO) compounds. To date, although applications have been made by other companies, the 
FDA has not approved any NDAs for any ASO compounds for cancer treatment. In addition, each of Archexin, RX-
0201-nano and RX-0047-nano is of a drug class (Akt inhibitor, in the case of Archexin and RX-0201-nano, and HIF 
inhibitor, in the case of RX-0047) that has not been approved by the FDA to date, nor have we submitted such NDA. 
After the clinical trials are completed, the FDA has substantial discretion in the drug approval process and may require 
us to conduct additional pre-clinical and clinical testing or to perform post-marketing studies. 

In  foreign jurisdictions, we must receive approval from  the appropriate  regulatory  authorities  before we can 
commercialize our drugs. Foreign regulatory approval processes generally include all of the risks associated with the 
FDA  approval  procedures  described  above.  We  cannot  assure  you  that  we  will  receive  the  approvals  necessary  to 
commercialize our drug candidates for sale outside the United States. 

There is no assurance as to the precise scope of our marketing exclusivity afforded under the Orphan Drug Act. 

 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Even  if  we  have  orphan  drug  designation  for  a  particular  drug  indication,  we  cannot  guarantee  that  another 
company also holding orphan drug designation will not receive FDA approval for the same indication before we do.  If 
that  were to happen,  our applications for that indication may  not  be approved until  the competing company’s seven-
year period of exclusivity expired. Even if we are the first to obtain FDA approval for an orphan drug indication, there 
are certain circumstances under which a competing product may be approved for the same indication during our seven-
year  period  of  marketing  exclusivity,  such  as  if  the  later  product  is  shown  to  be  clinically  superior  to  the  orphan 
product.  Further,  the  seven-year  marketing  exclusivity  would  not  prevent  other  sponsors  from  obtaining  approval  of 
the same compound for other indications or the use of other types of drugs for the same use as the orphan drug. 

Our drug candidates are in the stages of clinical trials. 

Our  drug  candidates  are  in  the  stage  of  development  and  require  extensive  clinical  testing,  which  are  very 
expensive,  time-consuming  and  difficult  to  design.  Archexin,  our  oncology  drug  candidate,  is  currently  in  Phase  IIa 
trials  for  pancreatic  cancer.  In  2010,  we  initiated  a  Phase  IIb  clinical  trial  of  Serdaxin  for  depression,  with  results 
expected in early 2012. We completed our Phase IIa clinical trial for Zoraxel, a sexual dysfunction drug candidate, and 
will initiate a Phase IIb clinical trial in the second half of 2011. 

Clinical trials are very expensive, time-consuming and difficult to design and implement. 

Human  clinical  trials  are  very  expensive  and  difficult  to  design  and  implement,  in  part  because  they  are 
subject to rigorous regulatory requirements. The clinical trial process is also time-consuming. We estimate that clinical 
trials of our current drug candidates will take up to three years to complete. Furthermore, failure can occur at any stage 
of the trials, and we could encounter problems that cause us to abandon or repeat clinical trials. The commencement 
and completion of clinical trials may be delayed by several factors, including, but not limited to: 

· 

· 

· 

· 

· 

· 

· 

· 

unforeseen safety issues; 

determination of dosing issues; 

lack of effectiveness during clinical trials; 

change in the standard of care of the indication being studied 

reliance on third party suppliers for the supply of drug candidate samples; 

slower than expected rates of patient recruitment; 

inability to monitor patients adequately during or after treatment; 

inability or unwillingness of medical investigators and institutional review boards to follow our 
clinical protocols; and 

· 

lack of sufficient funding to finance the clinical trials. 

We  or  the  FDA  may  suspend  clinical  trials  at  any  time  if  it  appears  that  we  are  exposing  participants  to 

unacceptable health risks or if the FDA finds deficiencies in our IND submissions or the conduct of these trials. 

Additionally, we may have difficulty enrolling patients in our clinical trials. If we experience such difficulties, 
we  may  not  be  able  to  complete  the  clinical  trial  or  we  may  experience  significant  delays  in  completing  the  clinical 
trial. 

If the results of our clinical trials fail to support our drug candidate claims, the completion of development of such 
drug  candidate  may  be  significantly  delayed  or  we  may  be  forced  to  abandon  development  altogether,  which  will 
significantly impair our ability to generate product revenues. 

 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
Even if our clinical trials are completed as planned, we cannot be certain that our results will support our drug 
candidate claims. Success in pre-clinical testing and early clinical trials does not ensure that later clinical trials will be 
successful, and we cannot be sure that the results of later clinical trials will replicate the results of prior clinical trials 
and pre-clinical testing. The clinical trial process may fail to demonstrate that our drug candidates are safe for humans 
and effective for indicated uses. This failure would cause us to abandon a drug candidate and may delay development 
of other drug candidates. Any delay in, or termination of, our clinical trials will delay the filing of our NDAs with the 
FDA  and,  ultimately,  delay  our  ability  to  commercialize  our  drug  candidates  and  generate  product  revenues.  In 
addition, our trial designs may involve a small patient population. Because of the small sample size, the results of early 
clinical trials may not be indicative of future results. In addition, standard of care treatments may change which would 
require additional studies to be done. 

If  physicians  and  patients  do  not  accept  and  use  our  drugs,  our  ability  to  generate  revenue  from  sales  of  our 
products will be materially impaired. 

Even if the FDA approves our drug candidates, physicians and patients may not accept and use them. Future 

acceptance and use of our products will depend upon a number of factors including: 

· 

· 

· 

· 

· 

awareness of the drug’s availability and benefits; 

perceptions by members of the health care community, including physicians, about the safety and 
effectiveness of our drugs; 

pharmacological benefit and cost-effectiveness of our product relative to competing products; 

availability of reimbursement for our products from government or other healthcare payers; 

effectiveness of marketing and distribution efforts by us and our licensees and distributors, if any; 
and 

· 

the price at which we sell our products. 

Because  we  expect  sales  of  our  current  drug  candidates,  if  approved,  to  generate  substantially  all  of  our 
product revenues for the foreseeable future, the failure of any of these drugs to find market acceptance would harm our 
business and could require us to seek additional financing. 

Much of our drug development program depends upon third-party researchers, and the results of our clinical trials 
and such research activities are, to a limited extent, beyond our control. 

We depend upon independent investigators and collaborators, such as universities and medical institutions, to 
conduct  our  pre-clinical  and  clinical  trials  and  toxicology  studies.  This  business  practice  is  typical  for  the 
pharmaceutical industry and companies like us. For example, the Phase I clinical trials of Archexin were conducted at 
the  Lombardi  Comprehensive  Cancer  Center  of  Georgetown  Medical  Center  and  the  University  of  Alabama  at 
Birmingham,  with  the  assistance  of  Amarex,  LLC,  a  pharmaceutical  clinical  research  service  provider  who  is 
responsible  for  creating  the  reports  that  will  be  submitted  to  the  FDA.  We  also  relied  on  TherImmune  Research 
Corporation (now named Bridge Global Pharmaceutical Services, Inc.), a discovery and pre-clinical service provider, to 
summarize  Archexin‘s  pre-clinical  data.  While  we  make  every  effort  internally  to  oversee  their  work,  these 
collaborators are not our employees and we cannot control the amount or timing of resources that they devote to our 
programs. These investigators may not assign priority to our programs or pursue them as diligently as we would if we 
were undertaking such programs ourselves. If outside collaborators fail to devote sufficient time and resources to our 
drug-development programs, or if their performance is substandard, the approval of our FDA applications, if any, and 
our introduction of new drugs, if any, may be delayed. The risk of completion or delay of these studies is not within our 
direct  control  and  a  program  delay  may  occur  due  to  circumstances  outside  our  control.  A  delay  in  any  of  these 
programs may not necessarily have a direct impact on our daily operations. However, to the extent that a delay results 
in  additional  cost  to  us,  a  higher  than  expected  expense  may  result.  These  collaborators  may  also  have  relationships 
with other commercial entities, some of which may compete with us. If our collaborators assist our competitors at our 
expense, our competitive position would be harmed. 

 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
We  rely  exclusively  on  third  parties  to  formulate  and  manufacture  our  drug  candidates,  which  expose  us  to  a 
number of risks that may delay development, regulatory approval and commercialization of our products or result in 
higher product costs. 

We have no experience in drug formulation or manufacturing. Internally, we lack the resources and expertise 
to formulate or manufacture our own drug candidates. Therefore, we rely on third party expertise to support us in this 
area. For example, we have entered into contracts with third-party manufacturers such as UPM Pharmaceuticals, Inc. to 
manufacture,  supply,  store  and  distribute  supplies  of  our  drug  candidates  for  our  clinical  trials.  If  any  of  our  drug 
candidates receive FDA approval, we will rely on these or other third-party contractors to manufacture our drugs. Our 
reliance on third-party manufacturers exposes us to the following potential risks: 

·  We may be unable to identify manufacturers on acceptable terms or at all because the number of 
potential manufacturers is limited and the FDA must approve any replacement contractor. This 
approval would require new testing and compliance inspections. In addition, a new manufacturer 
would have to be educated in, or develop substantially equivalent processes for, the production of our 
products after receipt of FDA approval, if any. 

·  Our third-party manufacturers might be unable to formulate and manufacture our drugs in the volume 

and of the quality required to meet our clinical needs and commercial needs. 

·  Our contract manufacturers may not perform as agreed or may not remain in the contract 

manufacturing business for the time required to supply our clinical trials or to successfully produce, 
store and distribute our products. 

·  Drug manufacturers are subject to ongoing periodic unannounced inspection by the FDA, the Drug 

Enforcement Agency (DEA), and corresponding state agencies to ensure strict compliance with good 
manufacturing practice and other government regulations and corresponding foreign standards. We 
do not have control over third-party manufacturers’ compliance with these regulations and standards, 
but we may be ultimately responsible for any of their failures. 

· 

If any third-party manufacturer makes improvements in the manufacturing process for our products, 
we may not own, or may have to share, the intellectual property rights of formulation patents . 

·  A third party manufacturer may gain knowledge from working with us that could be used to supply 

one of our competitors with a product that competes with ours. 

Each of these risks could delay our clinical trials, drug approval and commercialization and potentially result 

in higher costs and/or reduced revenues. 

Two of our clinical stage product candidates, Serdaxin and Zoraxel, are based on the same active ingredient, and if 
safety  concerns  arise  with  the  active  ingredient,  then  it  may  delay  or  prevent  further  development,  regulatory 
approval or successful commercialization of both product candidates. 

Two  of  our  clinical  stage  product  candidates,  Serdaxin  and  Zoraxel,  contain  the  same  active  ingredient.  If 
safety concerns arise or any other material adverse events occur involving the active ingredient, it may result in delays, 
prevent  the  further  development  or  adversely  impact  our  ability  to  obtain  necessary  FDA  and  other  regulatory 
approvals and to  successfully commercialize  both of  these product  candidates. Any  such delay  or  inability  to  further 
develop and commercialize one or both of Serdaxin and Zoraxel would harm our business and our prospects. 

Serdaxin  and  Zoraxel  may  be  subject  to  early  generic  competition  or  early  off-label  use  of  the  active  ingredient 
shared by both clinical stage product candidates. 

 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
Two of our clinical stage product candidates, Serdaxin and Zoraxel, are based upon the same active ingredient 
that has previously been approved by the FDA for use in combination with antibiotics. Because we do not have a patent 
that claims this active ingredient chemical structure and because we are not likely to be able to obtain new chemical 
entity market exclusivity for this active ingredient, we may be rapidly subject to early generic competition or early off-
label use of the active ingredient, which may adversely impact our ability to successfully commercialize one or both of 
Serdaxin or Zoraxel and may harm our financial condition, results of operations and business. 

We have no experience selling, marketing or distributing products and currently no internal capability to do so. 

We  currently  have  no  sales,  marketing  or  distribution  capabilities.  While  we  intend  to  have  a  role  in  the 
commercialization of our products, we do not anticipate having the resources in the foreseeable future to develop global 
sales and marketing capabilities for all of our proposed products. Our future success depends, in part, on our ability to 
enter  into  and  maintain  collaborative  relationships  with  other  companies  having  sales,  marketing  and  distribution 
capabilities,  the  collaborator’s  strategic  interest  in  the  products  under  development  and  such  collaborator’s  ability  to 
successfully  market  and  sell  any  such  products.  To  the  extent  that  we  decide  not  to,  or  are  unable  to,  enter  into 
collaborative  arrangements  with  respect  to  the  sales  and  marketing  of  our  proposed  products,  significant  capital 
expenditures,  management  resources  and  time  will  be  required  to  establish  and  develop  an  in-house  marketing  and 
sales force with technical expertise. We cannot assure you that we will be able to establish or maintain relationships 
with third party collaborators or develop in-house sales and distribution capabilities. To the extent that we depend on 
third parties for marketing and distribution, any revenues we receive will depend upon the efforts of such third parties, 
as  well  as  the  terms  of  our  agreements  with  such  third  parties,  which  cannot  be  predicted  at  this  early  stage  of  our 
development. We cannot assure you that such efforts will be successful. In addition, we cannot assure you that we will 
be able to market and sell our products in the United States or overseas. 

Developments by competitors may render our products or technologies obsolete or non-competitive. 

We  will  compete  against  fully  integrated  pharmaceutical  companies  and  smaller  companies  that  are 
collaborating  with  larger  pharmaceutical  companies,  such  as  Keryx  Biopharmaceuticals,  Genta  Incorporated  and 
Imclone  Systems  Incorporated,  as  well  as  academic  institutions,  government  agencies  and  other  public  and  private 
research  organizations.  In  addition,  many  of  these  competitors,  either  alone  or  together  with  their  collaborative 
partners, operate larger research and development  programs  or have substantially  greater financial resources  than we 
do, as well as more experience in: 

· 

· 

· 

· 

· 

developing drugs; 

undertaking pre-clinical testing and human clinical trials; 

obtaining FDA and other regulatory approvals of drugs; 

formulating and manufacturing drugs; and 

launching, marketing and selling drugs. 

Large  pharmaceutical  companies  such  as  Bristol-Myers  Squibb,  Eli-Lilly,  Novartis,  Pfizer  and  Glaxo-
SmithKline currently sell both generic and proprietary compounds for the treatment of cancer, depression and erectile 
dysfunction.  In  addition,  companies  pursuing  different  but  related  fields  represent  substantial  competition.  Many  of 
these  organizations  have  substantially  greater  capital  resources,  larger  research  and  development  staff  and  facilities, 
longer  drug  development  history  in  obtaining  regulatory  approvals  and  greater  manufacturing  and  marketing 
capabilities than we do. These organizations also compete with us to attract qualified personnel, parties for acquisitions, 
joint ventures or other collaborations. 

If we fail to adequately protect or enforce our intellectual property rights or secure rights to patents of others, the 
value of our intellectual property rights would diminish and our business and competitive position would suffer. 

 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
Our success, competitive position and future revenues will depend in part on our ability and the abilities of our 
licensors  to  obtain  and  maintain  patent  protection  for  our  products,  methods,  processes  and  other  technologies,  to 
preserve  our  trade  secrets,  to  prevent  third  parties  from  infringing  on  our  proprietary  rights  and  to  operate  without 
infringing the proprietary rights of third parties. We have an active patent protection program that includes filing patent 
applications on new compounds to treat cancer and other conditions, formulations, delivery systems, and methods of 
making and using products, and prosecuting these patent applications in the United States and abroad. As patents issue, 
we also  file continuation  applications for  some  of them.  Through these  actions, we  are building a patent portfolio  of 
patents assigned to and licensed to the company. Further, Rexahn is developing proprietary research and platforms to 
strengthen and expand our innovative pipelines. However, we cannot predict: 

· 

the degree and range of protection any patents will afford us against competitors, including whether 
third parties find ways to invalidate or otherwise circumvent our licensed patents; 

· 

if and when patents will issue in the United States or any other country; 

·  whether or not others will obtain patents claiming aspects similar to those covered by our licensed 

patents and patent applications; 

·  whether we will need to initiate litigation or administrative proceedings which may be costly whether 

we win or lose; 

·  whether our patents will be challenged by our competitors alleging that a patent is invalid or 

unenforceable and, if opposed or litigated, the outcome of any administrative or court action as to 
patent validity, enforceability, or scope; 

·  whether a competitor will develop a similar compound that is outside the scope of protection afforded 
by a patent or whether the patent scope is inherent in the claims modified due to interpretation of 
claim scope by a court; 

·  whether there were activities previously undertaken by a licensor that could limit the scope, validity, 

or enforceability of licensed patents and intellectual property; 

·  whether there will be challenges or litigation brought by a licensor alleging breach of a license 

agreement and its effect on our ability to practice particular technologies and the outcome of any such 
challenge or litigation; or 

·  whether a competitor will assert infringement of its patents or intellectual property, whether or not 

meritorious, and what the outcome of any related litigation or challenge may be. 

Our success also depends upon the skills, knowledge and experience of our scientific and technical personnel, 
our consultants and advisors as well as our licensors and contractors. To help protect our proprietary know-how and our 
inventions  for  which  patents  may  be  unobtainable  or  difficult  to  obtain,  we  rely  on  trade  secret  protection  and 
confidentiality agreements. To this end, we require all employees to enter into agreements that prohibit the disclosure 
of confidential information and, where applicable, require disclosure and assignment to us of the ideas, developments, 
discoveries and  inventions important  to our business. These  agreements may not provide  adequate protection  for our 
trade  secrets,  know-how  or  other  proprietary  information  in  the  event  of  any  unauthorized  use  or  disclosure  or  the 
lawful  development  by  others  of  such  information.  If  any  of  our  trade  secrets,  know-how  or  other  proprietary 
information is disclosed, the value of our trade secrets, know-how and other proprietary rights would be significantly 
impaired and our business and competitive position would suffer. 

If we infringe the rights of third parties we could be prevented from selling products and be forced to pay damages 
and defend against litigation. 

If our products, methods, processes and other technologies infringe the proprietary rights of other parties, we 

could incur substantial costs and may have to: 

 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
· 

· 

· 

· 

· 

obtain licenses, which may not be available on commercially reasonable terms, if at all; 

redesign our products or processes to avoid infringement; 

stop using the subject matter claimed in the patents held by others, which could cause us to lose the 
use of one or more of our drug candidates; 

pay damages; or 

defend litigation or administrative proceedings which may be costly whether we win or lose, and 
which could result in a substantial diversion of our management resources. 

Although to date, we have not received any claims of infringement by any third parties, as our drug candidates 
move into clinical trials and commercialization, our public profile and that of our drug candidates may be raised and 
generate such claims. 

Our license agreement with Revaax may be terminated in the event we commit a material breach, the result of which 
would significantly harm our business prospects. 

Our  license  agreement  with  Revaax  is  subject  to  termination  by  Revaax  if  we  materially  breach  our 
obligations under the agreement, including breaches with respect to certain installment payments and royalty payments, 
if  such  breaches  are  not  cured  within  a  60-day  period.  The  agreement  also  provides  that  it  may  be  terminated  if  we 
become  involved  in  a  bankruptcy,  insolvency  or  similar  proceeding.  If  this  license  agreement  is  terminated,  we  will 
lose  all  of  our  rights  to  develop  and  commercialize  the  licensed  compounds,  including  Serdaxin  and  Zoraxel,  which 
would significantly harm our business and future prospects. 

If we are unable to successfully manage our growth, our business may be harmed. 

In  addition to our own internally developed drug  candidates, we proactively  seek  opportunities to license-in 
the  compounds  in  oncology  and  other  therapeutic  areas  that  are  strategic  and  have  value  creating  potential  to  take 
advantage  of  our  development  know-how.  We  are  actively  pursuing  additional  drug  candidates  to  acquire  for 
development. Such  additional  drug  candidates  could  significantly  increase  our  capital requirements  and  place  further 
strain  on  the  time  of  our  existing  personnel,  which  may  delay  or  otherwise  adversely  affect  the  development  of  our 
existing drug candidates. Alternatively, we may be required to hire more employees, further increasing the size of our 
organization and related expenses. If we are unable to manage our growth effectively, we may not efficiently use our 
resources,  which  may  delay  the  development  of  our  drug  candidates  and  negatively  impact  our  business,  results  of 
operations and financial condition. 

We may not be able to attract and retain qualified personnel necessary for the development and commercialization 
of our drug candidates. Our success may be negatively impacted if key personnel leave. 

Attracting  and  retaining  qualified  personnel  will  be  critical  to  our  future  success.  We  compete  for  qualified 
individuals with numerous biopharmaceutical companies, universities and other research institutions. Competition for 
such individuals is intense, and we cannot assure you that we will be successful. 

The  loss  of  the  technical  knowledge  and  management  and  industry  expertise  of  any  of  our  key  personnel, 
especially  Dr.  Chang  H.  Ahn,  our  Chairman,  Chief  Executive  Officer,  Chief  Science  Officer  and  regulatory  expert, 
could  result  in  delays  in  product  development  and  diversion  of  management  resources,  which  could  adversely  affect 
our operating results. Dr. Ahn plans to step down as Chief Executive Officer, but will remain with the Company as our 
Chief Science Officer. We do not have “key person” life insurance policies for any of our officers. 

We may incur substantial liabilities and may be required to limit commercialization of our products in response to 
product liability lawsuits. 

 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
The  testing  and  marketing  of  medical  products  entail  an  inherent  risk  of  product  liability.  If  we  cannot 
successfully defend ourselves against product liability claims, we may incur substantial liabilities or be required to limit 
commercialization of our products. Our inability to obtain sufficient product liability insurance at an acceptable cost to 
protect  against  potential  product  liability  claims  could  prevent  or  inhibit  the  commercialization  of  pharmaceutical 
products  we  develop,  alone  or  with  collaborators.  Although  we  currently  carry  clinical  trial  insurance  and  product 
liability insurance we, or any collaborators, may not be able to maintain such insurance at a reasonable cost. Even if our 
agreements with any future collaborators entitles us to indemnification against losses, such indemnification may not be 
available or adequate should any claim arise. 

An investment in shares of our common stock is very speculative and involves a very high degree of risk. 

To  date,  we  have  generated  no  revenues  from  product  sales  and  only  minimal  revenues  from  a  research 
agreement  with  a  minority  shareholder,  and  interest  on  bank  account  balances  and  short-term  investments.  Our 
accumulated deficit as of December 31, 2010 and 2009 was $45,739,663 and $31,717,556, respectively. For the years 
ended  December  31,  2010  and  2009,  we  had  net  losses  of  $14,022,107  and  $2,903,098,  respectively,  partially  as  a 
result  of  expenses  incurred  through  a  combination  of  research  and  development  activities  related  to  the  various 
technologies under our control and expenses supporting those activities. Until we receive approval from the FDA and 
other regulatory authorities for our drug candidates, we cannot sell our drugs and will not have product revenues. 

The market price of our common stock may fluctuate significantly. 

The market price of our common stock may fluctuate significantly in response to factors, some of which are 

beyond our control, such as: 

· 

· 

· 

· 

· 

· 

the announcement of new products or product enhancements by us or our competitors; 

changes in our relationships with our licensors or other strategic partners; 

developments concerning intellectual property rights and regulatory approvals; 

variations in our and our competitors’ results of operations; 

changes in earnings estimates or recommendations by securities analysts; and 

developments in the biotechnology industry. 

Further,  the  stock  market,  in  general,  and  the  market  for  biotechnology  companies,  in  particular,  have 
experienced extreme price and volume fluctuations. Continued market fluctuations could result in extreme volatility in 
the  price  of  our  common  stock, which  could  cause  a decline  in  the  value  of  our  common  stock.  You  should  also be 
aware that price volatility might be worse if the trading volume of our common stock is low. We have not declared or 
paid,  and  do  not  expect  to  declare  or  pay,  any  cash  dividends  on  our  common  stock  because  we  anticipate  that  any 
earnings generated from future operations will be used to finance our operations and as a result, you will not realize any 
income from an investment in our common stock until and unless you sell your shares at a profit. 

Some or all of the “restricted” shares of our common stock issued in the merger of CPRD and Rexahn, Corp or 
held by other stockholders may be offered from time to time in the open market pursuant to Rule 144, and these sales 
may  have  a  depressive  effect  on  the  market  for  our  common  stock.  In  general,  an  affiliated  person  who  has  held 
restricted  shares  for  a  period  of  six  months  may,  upon  filing  with  the  SEC  a  notification  on  Form  144,  sell  into  the 
market common stock in an amount equal to 1 percent of the outstanding shares (approximately 700,000 shares) during 
a three-month period. Non-affiliates may sell restricted securities after six months without any limits on volume. 

Our common stock is currently listed on the NYSE AMEX under the trading symbol “RNN”. However, because our 
common stock may be a “penny stock,” it may be more difficult for you to sell shares of our common stock, and the 
market price of our common stock may be adversely affected. 

 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Our common stock may be a “penny stock” if, among other things, the stock price is below $5.00 per share, 
we are not listed on a national securities exchange or approved for quotation on the Nasdaq Stock Market, or we have 
not met certain net tangible asset or average revenue requirements. Broker-dealers who sell penny stocks must provide 
purchasers of these stocks with a standardized risk-disclosure document prepared by the SEC. This document provides 
information about penny stocks and  the nature  and level of risks  involved in  investing in the  penny-stock market. A 
broker must also give a purchaser, orally or in writing, bid and offer quotations and information regarding broker and 
salesperson compensation, make a written determination that transactions in penny stock are suitable for the purchaser, 
and  obtain  the  purchaser’s  written  agreement  to  the  purchase.  Broker-dealers  must  also  provide  customers  that  hold 
penny  stock  in  their  accounts  with  such  broker-dealer  a  periodic  statement  containing  price  and  market  information 
relating  to  the penny  stock.  If  a penny  stock is sold in violation of the penny stock rules,  purchasers may  be able to 
cancel their purchase and get their money back. If applicable, the penny stock rules may make it difficult for investors 
to sell their shares of our stock. Because of the rules and restrictions applicable to a penny stock, there is less trading in 
penny stocks and the market price of our common stock may be adversely affected. Also, many brokers choose not to 
participate in penny stock transactions. Accordingly, purchasers may not always be able to resell shares of our common 
stock publicly at times and prices that they feel are appropriate. 

We may require additional capital funding the receipt of which may impair the value of our common stock. 

If  we  expand  more  rapidly  than  currently  anticipated  or  if  our  working  capital  needs  exceed  our  current 
expectations, we may need to raise additional capital through public or private equity offerings or debt financings. Our 
future  capital  requirements  depend  on  many  factors  including  our  research,  development,  sales  and  marketing 
activities. We do not know whether additional financing will be available when needed, or will be available on terms 
favorable to us. If we cannot raise needed funds on acceptable terms, we may not be able to develop or enhance our 
products, take advantage of future opportunities or respond to competitive pressures or unanticipated requirements. To 
the extent we raise additional capital by issuing equity securities, our stockholders may experience substantial dilution 
and the new equity securities may have greater rights, preferences or privileges than our existing common stock. 

We  have  not  paid  dividends  to  our  stockholders  in  the  past,  and  we  do  not  anticipate  paying  dividends  to  our 
stockholders in the foreseeable future. 

We have not declared or paid cash dividends on our common stock. We currently intend to retain all future 
earnings,  if  any,  to  fund  the  operation  of  our  business,  and  therefore  we  do  not  anticipate  paying  dividends  on  our 
common stock in the foreseeable future. 

Our  business  could  be  adversely  impacted  if  we  have  deficiencies  in  our  disclosure  controls  and  procedures  or 
internal control over financial reporting. 

Effective  internal  control  over  financial  reporting  and  disclosure  controls  and  procedures  are  necessary  in 
order  for  us  to  provide  reliable  financial  and  other  reports  and  effectively  prevent  fraud.  These  types  of  controls  are 
designed to provide reasonable assurance regarding the reliability of financial reporting and the proper preparation of 
our  financial  statements,  as  well  as  regarding  the  timely  reporting  of  material  information.  If  we  cannot  maintain 
effective internal control or disclosure controls and procedures, or provide reliable financial or Securities and Exchange 
Commission (“SEC”) reports or prevent fraud, investors may lose confidence in our reported financial information, our 
common  stock  could  be  subject  to  delisting  on  the  stock  exchange  where  it  is  traded,  our  operating  results  and  the 
trading price of our common stock could suffer, and we might become subject to litigation. 

While  our  management  will  continue  to  review  the  effectiveness  of  our  internal  control  over  financial 
reporting and disclosure controls and procedures, there is no assurance that our disclosure controls and procedures or 
our  internal  control  over  financial  reporting  will  be  effective  in  accomplishing  all  control  objectives,  including  the 
prevention  and  detection  of  fraud,  all  of  the  time.  We  have  determined  that  there  was  a  material  weakness  over 
financial reporting as of December 31, 2009, however, we implemented remedial measures and believe that our internal 
controls are effective as of December 31, 2010. 

 
 
 
   
 
 
 
 
 
 
 
 
 
Item 8. Financial Statements and Supplementary Data. 

PART II 

Our  financial  statements  and  financial  statement  schedule  and  the  Report  of  Independent  Registered  Public 
Accounting Firm thereon are filed pursuant to this Item 8 and are included in this Form 10-K/A beginning on page F-1. 

PART III 

Item 15. Exhibits, Financial Statement Schedules. 

(a)  The following documents are filed as a part of this Form 10-K/A: 
(b) 

(1)   Financial Statements: 

Report of ParenteBeard LLC 

Balance Sheets at December 31, 2010 and December 31, 2009 

Statement of Operations for the years ended December 31, 2010 and December 31, 2009 and 
cumulative from March 19, 2001 (Inception) to December 31, 2010 

   Page

   F-1

   F-2

   F-3

Statements of Stockholders’ Equity and Comprehensive Loss from March 19, 2001 (Inception) 
to December 31, 2010 

   F-4

Statement of Cash Flows for the years ended December 31, 2010 and December 31, 2009 and 
cumulative from March 19, 2001 (Inception) to December 31, 2010 

   F-6

Notes to the Financial Statements

   F-8

(2) 

All  schedules  for  which  provision  is  made  in  the  applicable  accounting  regulations  of  the  SEC  are  omitted 
because  the  required  information  is  either  presented  in  the  financial  statements  or  notes  thereto,  or  is  not 
applicable, required or material. 

(3)   Exhibits: 

The documents listed below are filed with this Form 10-K/A as exhibits: 

Exhibit Number 

Exhibit Description 

23 
24 
31.1 
31.2 
32.1 
32.2 

Consent of ParenteBeard LLC, independent registered public accounting firm. 
Power of Attorney 
Certification of Chief Executive Officer Pursuant to Rule 13a-14(a) or Rule 15d-14(a). 
Certification of Chief Financial Officer Pursuant to Rule 13a-14(a) or Rule 15d-14(a). 
Certification of Chief Executive Officer of Periodic Report Pursuant to 18 U.S.C. Section 1350. 
Certification of Chief Financial Officer of Periodic Report Pursuant to 18 U.S.C. Section 1350. 

 
 
 
   
  
 
 
 
 
 
 
  
  
  
  
     
  
     
  
     
  
     
  
     
 
 
 
 
 
    
 
SIGNATURES 

In accordance with the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the issuer has 
duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized on this 23rd day of 
March 2011. 

REXAHN PHARMACEUTICALS, INC. 

   By:   /s/ Chang H. Ahn 
   Chang H. Ahn 
   Chairman and Chief Executive Officer 

In accordance with the requirement of the Securities Exchange Act of 1934, this report has been signed on the 23rd 
day of March 2011 by the following persons on behalf of the issuer and in the capacities indicated: 

Name 

Title 

/s/ Chang H. Ahn* 
Chang H. Ahn 

/s/ Tae Heum Jeong* 
Tae Heum Jeong 

/s/ Peter Brandt* 
Peter Brandt 

/s/ David McIntosh* 
David McIntosh 

/s/ Charles Beever* 
Charles Beever 

/s/ Kwang Soo Cheong* 
Kwang Soo Cheong 

/s/ Richard Kivel* 
Richard Kivel 

Chairman and Chief Executive Officer 
(Principal Executive Officer) 

Chief Financial Officer, Secretary and Director 
(Principal Financial and Accounting Officer) 

Director 

Director 

Director 

Director 

Director 

* By: /s/ Tae Heum Jeong, Attorney-in Fact 

Tae Heum Jeong, Attorney-in-Fact** 

** By authority of the power of attorney filed as Exhibit 24 hereto. 

 
 
 
   
  
 
 
  
  
     
  
  
  
 
 
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
  
 
 
 
  
 
 
 
 
Report of Independent Registered Public Accounting Firm 

To the Board of Directors 
Rexahn Pharmaceuticals, Inc. 
Rockville, Maryland 

We have audited the accompanying balance sheet of Rexahn Pharmaceuticals, Inc. (the “Company”) (a 
development stage company) as of December 31, 2010 and 2009, and the related statements of operations, 
stockholders’ equity and comprehensive loss, and cash flows for each of the two years in the period ended 
December 31, 2010 and the amounts in the cumulative from March 19, 2001 (inception) to December 31, 
2010 column in the statements of operations and cash flows. The Company’s management is responsible for 
these financial statements. Our responsibility is to express an opinion on these financial statements based 
on our audits. 

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight 
Board (United States). Those standards require that we plan and perform the audit to obtain reasonable 
assurance about whether the financial statements are free of material misstatement.  An audit also includes 
examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements, 
assessing the accounting principles used and significant estimates made by management, as well as 
evaluating the overall financial statement presentation. We believe that our audits provide a reasonable 
basis for our opinion. 

In our opinion, the financial statements referred to above, present fairly, in all material respects, the 
financial position of Rexahn Pharmaceuticals, Inc. as of December 31, 2010 and 2009, and the results of its 
operations and its cash flows for each of the two years in the period ended December 31, 2010 and the 
cumulative period from March 19, 2001 (inception) to December 31, 2010, in conformity with accounting 
principles generally accepted in the United States of America. 

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board 
(United States), Rexahn Pharmaceuticals, Inc. internal control over financial reporting as of December 31, 
2010, based on criteria established in Internal Control‐Integrated Framework issued by the Committee of 
Sponsoring Organizations of the Treadway Commission (COSO), and our report dated March 16, 2011 
expressed unqualified opinion. 

As discussed in Note 2 to the financial statements, the 2009 financial statements have been restated to 
correct a material misstatement. 

/s/ PARENTEBEARD LLC 

New York, New York 
March 16, 2011

(See accompanying notes to financial statements.) 

F-1 

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REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Balance Sheet 

   December 31,  2010     

   December 31,  2009 
(Restated)   

ASSETS 

Current Assets: 

Cash and cash equivalents 
Marketable securities (note 4) 
Research tax credit receivable (note 16) 
Prepaid expenses and other current assets (note 5) 
Note receivable – current portion (note 6) 

Total Current Assets 

Restricted Cash Equivalents (note 17) 

Note Receivable (note 6) 

Equipment, Net (note 7) 

Total Assets 

Current Liabilities: 

$  12,340,239 
2,451,620 
145,513 
706,649 
28,023 

15,672,044 

401,893 

18,682 

123,565 

$ 

7,298,032 
175,000 
- 
320,935 
- 

7,793,967 

2,026,060 

- 

168,978 

$   16,216,184 

$ 

 9,989,005 

LIABILITIES AND STOCKHOLDERS’ EQUITY 

Accounts payable and accrued expenses (note 8) 

$  1,820,900  

$     785,904  

Deferred Revenue (note 9)  

Other Liabilities (note 10) 

900,000 

133,117 

975,000 

128,501 

Warrant Liabilities (note 14) 

2,966,710 

3,099,476 

Put Feature on Common Stock (note 15) 

- 

97,713 

Total Liabilities 

5,820,727 

5,086,594 

Commitments and Contingencies (note 17) 

Stockholders’ Equity (note 12): 

Preferred stock, par value $0.0001, 100,000,000 authorized   
   shares, none issued and outstanding 
Common stock, par value $0.0001, 500,000,000 authorized 
   shares, 84,175,054 (2009 – 71,938,701) issued and  
   outstanding 84,160,849 (2009 – 71,924,496)  
Additional paid-in capital 
Accumulated other comprehensive loss 
Accumulated deficit during the development stage 
Treasury stock, 14,205 shares, at cost 

- 
8,418 

- 
7,194 

56,157,452 
(2,340) 
(45,739,663) 
(28,410) 

36,641,183 
- 
(31,717,556) 
(28,410) 

Total Stockholders’ Equity 

10,395,457 

4,902,411 

Total Liabilities and Stockholders’ Equity  

 $  16,216,184 

$  9,989,005 

(See accompanying notes to financial statements.) 

F-2 

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REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Statement of Operations 

For the Year Ended December 31, 

Cumulative 

from March 19, 

2001 

(Inception) to 

2010 

2009 
(Restated) 

December 31, 2010 
(Restated) 

$          75,000 

$           75,000 

$       600,000 

5,990,624 
4,009,701 
329,925 
50,659 

2,944,103 
3,251,971 
303,220 
41,604 

23,799,166 
20,493,516 
1,554,978 
595,467 

10,380,909 

6,540,898 

46,443,127 

(10,305,909) 

(6,465,898) 

(45,843,127) 

- 

133,268 
- 
56,047 
(3,823,146) 

97,713 

(180,080) 
- 
(3,716,198) 

11,025 

67,445 
- 
- 
1,793,101 

1,915,179 

(223,950) 
- 
3,562,800 

(9,341) 

1,312,067 
(301,147) 
56,047 
(1,102,345) 

2,315,539 

(542,356) 
(1,625,000) 
103,464 

Revenues: 

Research 

Expenses: 

General and administrative 
Research and development 
Patent fees 
Depreciation and amortization 

Total Expenses 

Loss from Operations 

Other Income (Expense) 

Realized gain (loss) on marketable 

securities         .     

Interest income 
Interest expense 
Other income 
Unrealized (loss) gain on  
        fair value of warrants 
Unrealized gain on fair value of  
        put feature on common stock 
Financing expense 
Beneficial conversion feature 

Total Other Income (Expense) 

Net Loss Before Provision for Income Taxes 

(14,022,107) 

   (2,903,098) 

 (45,739,663) 

Provision for Income Taxes 

- 

- 

- 

Net Loss 

$ (14,022,107) 

$   (2,903,098) 

$ (45,739,663) 

Net loss per share, basic and diluted 

$(0.18) 

$(0.05) 

Weighted average number of shares outstanding, 

basic and diluted 

78,662,495 

61,411,442 

(See accompanying notes to financial statements.) 

F-3 

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REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Statements of Stockholders’ Equity (Deficit) and Comprehensive Loss  
Period from March 19, 2001 (Inception) to December 31, 2010 (Restated) 

 Common Stock  

 Number of  
 shares  

 Amount  

Additional 
Paid in 
Capital 

 Accumulated  
 Deficit  
 During the  
 Development  
 Stage  

 Treasury Stock  

 Number of  
 stock  

 Amount  

Accumulated 
Other 
Comprehensive  
 Loss 

 Total  
Stockholders’ 
 Equity  
 (Deficit)  

  $ 

  $ 

- 
4,448,702 
- 

- 
- 
(625,109) 

  $ 

-  
- 
- 

  $ 

- 
7,126,666  
-  

7,126,666  
-  

7,126,666  
500,000  

- 
- 

-  
71,266 
- 

71,266  
- 

71,266 
5,000 

- 
- 

 7,626,666  
1,500  

76,266 
15  

- 
- 

- 
- 

4,448,702  
- 

4,448,702  
1,995,000  

538,074  
- 

6,981,776  
1,785  

230,770  
- 

(625,109) 
(1,181,157) 

(1,806,266) 
- 

- 
(2,775,075) 

(4,581,341) 
- 

- 
(3,273,442) 

7,628,166  
 30,512,664  

76,281 
(72,467) 

7,214,331  
72,467  

(7,854,783) 
- 

3,397,802  

 4,175,000  

 650,000  

 40,000  

7,000  

-  

- 
- 

340 

417  

65  

4  

1  

- 

- 
- 

(340) 

8,349,565  

1,299,935  

9,596  

21,876  

1,625,000  

- 

- 

- 

- 

- 

- 

436,748  
-  

- 
(6,349,540) 

 46,410,632  

4,641  

19,029,178  

(14,204,323) 

 61,705  

6  

14,802  

3,850,000  

385  

3,849,615  

- 

- 

- 

- 
- 

- 
- 

- 
- 

- 
- 

- 
- 

- 
- 

- 

- 

- 

- 

- 

- 

- 
- 

- 

- 

- 

Opening balance, 

March 19, 2001  
Common stock issued 
Net loss 
Balances at, December 

31, 2001  

Net loss 
Balances at, December 

31, 2002 

Common stock issued 
Stock option 

compensation 

Net loss 
Balances at, December 

31, 2003 

Common stock issued 
Stock option 

compensation 

Net loss 
Balances at, December 

31, 2004 

Stock split (5 for 1) 
Common stock issued 
in connection with 
merger 

Common stock issued 

for cash 

Common stock issued 
on conversion of 
convertible debt 
Exercise of stock 

options 

Common stock issued 
in exchange for 
services 

Beneficial conversion 

feature   
Stock option 

compensation 

Net loss 
Balances at, December 

31, 2005 

Exercise of stock 

options 

Common stock issued 
on conversion of 
convertible debt 
Purchase of treasury 

stock 

Stock option 

compensation 

Net loss 
Balances at, December 

31, 2006 

  $ 

- 
- 
- 

- 
- 

- 
- 

- 
- 

- 
- 

- 
- 

- 
- 

- 

- 

- 

- 

- 

- 

- 
- 

- 

- 

- 

- 
- 
- 

- 
- 

- 
- 

- 
- 

- 
- 

- 
- 

- 
- 

- 

- 

- 

- 

- 

- 

- 
- 

- 

- 

- 

- 

- 
- 

  $ 

- 
4,519,968  
(625,109) 

3,894,859  
(1,181,157) 

2,713,702  
2,000,000  

538,074  
(2,775,075) 

2,476,701  
1,800  

230,770  
(3,273,442) 

(564,171) 
- 

- 

8,349,982  

1,300,000  

9,600  

21,877  

1,625,000  

436,748  
(6,349,540) 

4,829,496  

14,808  

3,850,000  

(28,410) 

1,033,956  
(6,486,003) 

- 

- 
- 

- 

- 
- 

- 

14,205  

(28,410) 

1,033,956  
- 

- 
(6,486,003) 

- 
- 

- 
- 

50,322,337  

  $ 

5,032  

  $  23,927,551  

  $  (20,690,326) 

14,205  

  $   (28,410) 

  $    

   - 

  $ 

3,213,847  

(See accompanying notes to financial statements.) 

F-4 

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REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Statements of Stockholders’ Equity (Deficit) and Comprehensive Loss (Continued) 
Period from March 19, 2001 (Inception) to December 31, 2010 (Restated) 

 Common Stock  

Additional 

 During the  

 Treasury Stock  

 Accumulated  

 Deficit  

 Accumulated  
Other  

 Total  
Stockholders’ 

 Number of  

 shares  

 Amount  

Paid-in 

Capital 

 Development  

 Number of  

Comprehensive 

 Stage  

 shares  

 Amount  

Loss 

 Equity  

 (Deficit)  

Balances at December 31, 

2006 

50,322,337 

  $  5,032  

  $  23,927,551  

  $  (20,690,326) 

14,205  

  $  (28,410) 

  - 

  $ 

3,213,847  

Common stock issued  

4,857,159 

Stock options exercised 
Stock option compensation 
Stock issuance costs 

Net loss 

Balances at December 31, 

2007 

Common stock issued  

Stock options exercised 
Stock option compensation 

Net loss 
Unrealized loss on   

securities available-for -
sale 

Balances at December 31, 

127,500 
- 
- 

- 

55,306,996 

642,858 

90,000 
- 

- 

- 

486  

12  
- 
- 

- 

5,530  

65 

9  
- 

- 

- 

6,799,538  

59,988  
1,121,646  
(139,674) 

- 

- 
- 
- 

- 

(4,304,005) 

- 

- 
- 
- 

- 

- 

- 
- 
- 

- 

31,769,049  

  (24,994,331) 

14,205  

 (28,410) 

899,936 

31,191 
484,684 

- 

- 

- 

- 
- 

(4,912,148) 

- 

- 

- 
- 

- 

- 

- 

- 
- 

- 

- 

- 

- 
- 
- 

- 

- 

- 

- 
- 

- 

6,800,024  

60,000  
1,121,646  
 (139,674) 

(4,304,005) 

6,751,838  

900,001  

31,200  
484,684 

(4,912,148) 

(550,480) 

(550,480) 

2008 

56,039,854 

5,604  

33,184,860  

  (29,906,479) 

14,205  

(28,410) 

(550,480) 

2,705,095  

Prior period adjustment 

(Note 2) 

Balances at January 1, 
2009, as adjusted 

Issuance of common stock 

- 

- 

(6,399,805) 

1,092,021 

- 

- 

- 

(5,307,784) 

56,039,854 

5,604 

26,785,055 

  (28,814,458) 

14,205 

(28,410) 

(550,480) 

(2,602,689) 

and units 

15,883,847 

1,588 

9,996,015 

Stock options exercised 

15,000 

Stock issuance costs 

Stock option compensation 

Net loss 
–Reversal of unrealized 
loss on securities 
available-for-sale 

Balances at December 31, 
   2009 
Issuance of common stock 

and units 

Stock issuance costs 
Common stock issued in 
exchange for services 

Stock options exercised 

Stock warrants exercised 

Stock option compensation 

Net loss 
Unrealized loss on   

securities available-for -
sale 

Balances at December 31, 
   2010 

- 

- 

- 

- 

3,600 

(641,018) 

              497,531 

2 

- 

- 

- 

- 

- 

 - 

(2,903,098) 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

71,938,701 

       7,194 

       36,641,183 

    (31,717,556) 

14,205 

    (28,410) 

6,666,667 

- 

1,700,000 

155,500 

3,714,186 

- 

- 

- 

667 

- 

170 

16 

371 

- 

- 

- 

8,198,534 

(681,773) 

2,107,830 

107,224 

9,199,797 

             584,657 

- 

- 

- 

- 

- 

- 

- 

- 

  (14,022,107) 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

- 

9,997,603 

3,602 

 (641,018) 

497,531 

(2,903,098) 

550,480 

550,480 

- 

- 

- 

- 

- 

- 

- 

- 

         4,902,411 

8,199,201 

 (681,773) 

2,108,000 

107,240 

9,200,168 

584,657 

(14,022,107) 

(2,340) 

(2,340) 

84,175,054 

      $ 8,418 

    $   56,157,452 

  $  (45,739,663) 

14,205 

$    (28,410) 

$            (2,340) 

$   10,395,457 

(See accompanying notes to financial statements.) 

F-5 

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REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Statement of Cash Flows 

Cash Flows from Operating Activities: 

Net loss 

Adjustments to reconcile net loss to net cash used in 

operating activities: 
Beneficial conversion feature 
Compensatory stock 
Depreciation and amortization 
Stock option compensation 
Amortization of deferred revenue 
Note receivable 
Realized (gains) losses on marketable securities 

  Amortization of deferred lease incentive 
  Unrealized loss (gain) on fair value of warrants 

     Unrealized gain on fair value of put feature on common        

stock 
  Financing expense 
  Deferred lease expenses 
  Loss on impairment of intangible assets 

Changes in assets and liabilities: 

Prepaid expenses and other current assets 
Research tax credit receivable 
Accounts payable and accrued expenses 

Net Cash Used in Operating Activities 

Cash Flows from Investing Activities: 

Restricted cash equivalents 
Purchase of equipment 
Purchase of marketable securities 
Proceeds from sales of marketable securities 
Payment of licensing fees 

For the Year Ended 
December 31, 

2010 

2009 
(Restated) 

$  (14,022,107) 

$  (2,903,098) 

Cumulative 
From March 19, 2001 
(Inception) to  
December 31, 
2010 
(Restated) 
$ 

(45,739,663) 

- 
2,108,000 
50,659 
584,657 
(75,000) 
(46,705) 
- 
(20,000) 
3,823,146 
(97,713) 

180,080 
24,616 
- 

(385,714) 
(145,513) 
1,034,996 

- 
- 
41,604 
497,531 
(75,000) 
- 
(11,025) 
(10,000) 
(1,793,101) 
(1,915,179) 

223,950 
38,501 
286,132 

45,830 
- 
427,010 

1,625,000 
2,129,877 
595,467 
4,939,022 
(600,000) 
(46,705) 
9,341 
(30,000) 
1,102,345 
(2,315,539) 

542,356 
63,117 
286,132 

(706,649) 
(145,513) 
1,820,900 

(6,986,598) 

  (5,146,845) 

(36,470,512) 

1,624,167 
(5,246) 
(2,353,960) 
                75,000 
- 

(2,026,060) 
(18,370) 
(1,371,824) 
         4,758,079 
- 

(401,893) 
(548,948) 
(13,123,960)
10,660,659 
(356,216) 

(3,770,358) 

42,585,301 
110,842 
3,263,376 
5,150,000 
1,500,000 
(28,410) 

52,581,109 

Net Cash Provided by (Used in) Investing  Activities 

(660,039) 

 1,341,825 

Cash Flows from Financing Activities: 

Issuance of common stock and units, net of issuance costs 
Proceeds from exercise of stock options 
Proceeds from exercise of stock warrants 
Proceeds from long-term debt 
Proceeds from research contribution 
Purchase of treasury stock 

Net Cash Provided by Financing Activities 

Net Increase in Cash and Cash Equivalents 

Cash and Cash Equivalents - beginning of period 

9,318,228 
107,240 
3,263,376 
- 
- 
- 

12,688,844 

5,042,207 

7,298,032 

10,730,320 
3,602 
- 
- 
- 
- 

10,733,922 

6,928,902 

12,340,239 

369,130 

                        - 

Cash and Cash Equivalents - end of period 

$    12,340,239 

$     7,298,032 

$    12,340,239 

(See accompanying notes to financial statements.) 

F-6 

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2.Financial_Statements.pdf   6

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REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Statement of Cash Flows (Continued) 

For the Year Ended 
December 31, 

2010 

 2009          

(Restated) 

Cumulative 
From March 19, 2001 
(Inception) to  
December 31, 

 2010          

(Restated) 

Supplemental Cash Flow Information 

Interest paid 

   $     

- 

$                    - 

$         301,147 

Non-cash financing and investing activities: 

Warrants issued 

Put feature on common stock issued 

Dilutive issuances of common stock 

 $      1,980,880 

  $      4,565,821   

$      8,130,094 

   $                     - 

   $                     - 

         $      4,954,738 

   $                     - 

   $      2,639,199 

   $      2,639,199 

Warrant liability extinguishment from exercise of warrants 

   $       5,936,792 

   $                     - 

   $      5,936,792 

Leasehold improvement incentive 

   $                     - 

   $         100,000   

         $         100,000 

Settlement of lawsuit 

   $           43,953 

   $                    - 

         $           43,953 

(See accompanying notes to financial statements.) 

F-7 

2.Financial_Statements.pdf   7

2.Financial_Statements.pdf   7

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REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

1.  Operations and Organization 

Operations and Organization 

to 

Rexahn Pharmaceuticals, Inc. (the “Company” or “Rexahn Pharmaceuticals”), a Delaware corporation, is a 
development  stage  biopharmaceutical  company  dedicated 
the  discovery,  development  and 
commercialization  of  innovative  treatments  for  cancer,  central  nervous  system  (“CNS”)  disorders,  sexual 
dysfunction and other medical needs. The Company has not yet generated commercial sales revenue and has 
been able to fund its operating losses to date through the sale of its common stock, issuance of long-term 
debt, and proceeds from reimbursed research and development costs. The Company believes that its existing 
cash and cash equivalents and marketable securities will be sufficient to cover its cash flow requirements for 
2011.  Management  has  the  capability  of  managing  the  Company’s  operations  within  existing  cash  and 
marketable  securities  available  by  reducing  its  research  and  development  activities.  This  may  result  in 
slowing  down  clinical  studies,  but  will  conserve  the  Company’s  cash  to  allow  it  to  operate  for  the  next 
twelve months. 

Reverse Merger Acquisition 

Pursuant  to  an  Agreement  and  Plan  of  Merger  by  and  among  Rexahn,  Corp  (“Rexahn”),  Corporate  Road 
Show.Com  Inc.  (“CRS”),  a  New  York  corporation  and  predecessor  corporation  of  the  Company,  CRS 
Merger  Sub,  Inc.,  a  Delaware  corporation  and  wholly  owned  subsidiary  of  CRS  (“Merger  Sub”),  CRS 
Delaware,  Inc.,  a  Delaware  corporation  and  wholly  owned  subsidiary  of  CRS,  immediately  after  giving 
effect to a 1-for-100 reverse stock split and the reincorporation of CRS as a Delaware corporation under the 
name  Rexahn  Pharmaceuticals,  Inc.  (“Rexahn  Pharmaceuticals”),  on  May  13,  2005,  Merger  Sub  merged 
with and into Rexahn, with Rexahn surviving as a wholly owned subsidiary of Rexahn Pharmaceuticals (the 
“Acquisition  Merger”).  In  the  Acquisition  Merger,  (i)  each  share  of  the  issued  and  outstanding  common 
stock of Rexahn (other than dissenting shares) was converted into the right to receive five shares of Rexahn 
Pharmaceuticals common stock; and (ii) each issued, outstanding and unexercised option to purchase a share 
of Rexahn common stock was converted into an option to purchase five shares of Rexahn Pharmaceuticals 
common stock. 

Shares of Rexahn Pharmaceuticals common stock issued in the Acquisition Merger were exempt from the 
registration  requirements  of  the  Securities  Act  of  1933,  as  amended  (the  “Securities  Act”),  pursuant  to 
Regulation D under the Securities Act and/or Regulation S under the Securities Act. These shares of Rexahn 
Pharmaceuticals common stock are deemed “restricted securities” and bear an appropriate restrictive legend 
indicating that the resale of such shares may be made only pursuant to registration under the Securities Act 
or pursuant to an available exemption from such registration. 

For accounting purposes, the Acquisition Merger was accounted for as a reverse acquisition of CRS (legal 
acquirer)  by  Rexahn  (accounting  acquirer).    As  a  result,  following  the  Acquisition  Merger,  the  historical 
financial statements of Rexahn became the historical financial statements of the Company. 

Merger of Subsidiary 

On September 29, 2005, the Company’s wholly owned subsidiary, Rexahn, was merged with and into the 
Company and Rexahn’s separate existence was terminated. 

2.Financial_Statements.pdf   8

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F-8 

 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

2. Prior Period Adjustment 

The financial statements of the Company as of and for the year ended December 31, 2009  have been restated 
as a result of management’s determination that the Company had misclassified warrants issued to investors 
from offerings occurring in December 2007, March 2008, June 2009, October 2009 and December 2009.  The 
warrants were previously reported as equity, but further review by management concluded that these warrants 
should  have  been  classified  as  liabilities  at  inception  due  to  provisions  within  the  warrant  agreement,  and 
should be reported at fair value at the balance sheet date.     

Management  also  determined  that  the  Anti-dilution  make  whole  provision  (the  “Anti-dilution  provision”), 
which is a put on the common stock, issued in the 2007 and 2008 offerings were also misclassified as equity.  
The  Anti-dilution  provision,  whereby  additional  shares  and  warrants  would  be  issued  to  investors  if  the 
Company,  within  two  years  of  the  date  of  the  offering,  issued  equity  instruments  at  prices  lower  than  the 
individual  unit  offering  prices  is  a  put  on  the  common  stock  and  therefore  should  have  been  reported  as  a 
liability at fair value at inception.   

The  restatement  of  these  errors  reduces  the  Company’s  net  loss,  as  originally  reported  for  the  year  ended 
December 31, 2009 by $3,484,330 ($.05 per basic and diluted share) to a loss of $2,903,098.  The restatement 
also reduced the Company’s accumulated deficit by $1,092,021 due to the prior period adjustment from the 
Company’s offerings in 2007 and 2008 as of January 1, 2009.  The restated balances at January 1, 2009 also 
include a reduction of additional paid-in capital of $6,399,805, and an increase in warrant liabilities and the 
put  feature  on  common  stock  liability  of  $655,693  and  $4,652,091,  respectively.    The  restatement  had  no 
effect on the Company’s cash, loss from operations or net cash used in operating activities for the year ended 
December 31, 2009.  After reviewing the circumstances leading up to the restatement, management believes 
that  the  errors  were  inadvertent  and  unintentional.    In  addition,  following  the  discovery  of  these  errors,  the 
Company began implementing procedures intending to strengthen its internal control processes and prevent a 
recurrence of these errors. 

The  effects  of  the  restatement  on  the  Company’s  balance  sheet  as  of  December  31,  2009  and  statement  of 
operations and cash flows for the year then ended is as follows: 

(All amounts in U.S. dollars) 

BALANCE SHEET AS OF DECEMBER 31, 2009 

Warrant liabilities 
Put feature on common stock 
Total liabilities 
Additional paid-in capital 
Accumulated deficit during the development 
stage 
Total stockholders’ equity 

As previously 
reported 

                       -   
                   -   
      1,889,405 
      44,414,723 
   (36,293,907) 

Effect of 
Restatement 
      3,099,476 
       97,713 
      3,197,189 
   (7,773,540) 
      4,576,351 

As restated 
       3,099,476 
       97,713 
      5,086,594 
    36,641,183 
  (31,717,556) 

        8,099,600 

      (3,197,189) 

     4,902,411 

2.Financial_Statements.pdf   9

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F-9 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

2.  Prior Period Adjustment, (cont’d) 

STATEMENT OF OPERATIONS FOR THE YEAR ENDED DECEMBER 31, 2009 

Unrealized gain on fair value of put feature 

on common stock 

Unrealized gain on fair value of warrants 
Financing expense 
Total other income  
Net loss before provision for income taxes  
Net loss 
Net loss per share, basic and diluted 

As previously 
reported 

Effect of 
Restatement 

As restated 

                     -   
                     -   
                     -   
           78,470   
   (6,387,428) 
   (6,387,428) 
            (0.10)   

         1,915,179 
      1,793,101 
      (223,950) 
      3,484,330 
      3,484,330 
      3,484,330 

         (0.05)   

          1,915,179 
       1,793,101 
(223,950) 
3,562,800 
(2,903,098) 
(2,903,098) 
           (0.05)   

STATEMENT OF CASH FLOWS FOR THE YEAR ENDED DECEMBER 31, 2009 

Cash Flows from Operating Activities: 
Net loss 
Unrealized gain on fair value of put feature 
on common stock 
Unrealized gain on fair value of warrants 
Financing expense 
Net cash used in operating activities  

As previously 
reported 

Effect of 
Restatement 

As restated 

   (6,387,428) 

      3,484,330 

(2,903,098) 

   - 
- 
- 
(5,146,845) 

(1,915,179) 
(1,793,101) 
223,950 
- 

(1,915,179) 
(1,793,101) 
223,950 
(5,146,845) 

3. 

Summary of Significant Accounting Policies 

a)  Cash and Cash Equivalents 

Cash and cash equivalents include cash on hand and short-term investments purchased with remaining 
maturities of three months or less at acquisition. 

b)  Marketable Securities 

Marketable  securities  are  considered  “available-for-sale”  in  accordance  with  Financial  Statement 
Accounting  Board  (“FASB”)  Accounting  Standard  Codification  (“ASC”)  320,  “Debt  and  Equity 
Securities”,  and  thus  are  reported  at  fair  value  in  our  accompanying  balance  sheet,  with  unrealized 
gains and losses excluded from earnings and reported as a separate component of stockholders’ equity.  
Realized gains and losses are accounted for on the basis of specific identification and are included in 
other income or expense in the statement of operations.  The Company classifies such investments as 
current  on  the  balance  sheet  as  the  investments  are  readily  marketable  and  available  for  use  in  our 
current operations.  Accumulated other comprehensive loss for the years ended December 31, 2010 and 
2009 was $2,340 and $0, respectively.  The Company’s total comprehensive loss was $14,024,447 and 
$2,352,618 for the years ended December 31, 2010 and 2009, respectively. 

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F-10 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
  
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

3. 

Summary of Significant Accounting Policies (cont’d) 

c) 

Equipment 

Equipment is stated at cost less accumulated depreciation. Depreciation, based on the lesser of the term 
of the lease or the estimated useful life of the assets, is provided as follows: 

Furniture and fixtures 
Office equipment 
Lab equipment 
Computer equipment 
Leasehold improvements 

Life  Depreciation Method 
straight line 
straight line 
straight line 
straight line 
straight line 

7 years 
5 years 
5-7 years 
5 years 
3-5 years 

During the year ended December 31, 2010, the Company changed the depreciation method for furniture 
and fixtures, office equipment, and lab equipment from double declining balance to straight line as it 
concluded that the straight line method matched the expense throughout the useful lives of the assets. 
The Company determined that the impact of the change in depreciation method was immaterial. 

d)  Research and Development  

Research  and  development  costs  are  expensed  as  incurred.    Research  and  development  expenses 
consist primarily of third party service costs under research and development agreements, salaries and 
related  personnel  costs,  as  well  as  stock  compensation  related  to  these  costs,  costs  to  acquire 
pharmaceutical  products  and  product  rights  for  development  and  amounts  paid  to  contract  research 
organizations,  hospitals  and  laboratories  for  the  provision  of  services  and  materials  for  drug 
development and clinical trials. 

Costs  incurred  in  obtaining  the  licensing  rights  to  technology  in  the  research  and  development  stage 
that  have  no  alternative  future  uses  and  are  for  unapproved  product  compounds  are  expensed  as 
incurred. 

e)  Use of Estimates 

The preparation of financial statements in conformity with accounting principles generally accepted in 
the  United  States  requires  management  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  and  the  reported  amounts  of  revenues  and  expenses  during  the  reporting  period.  
These estimates are based on management’s best knowledge of current events and actions the Company 
may  undertake  in  the  future.    Actual  results  may  ultimately  differ  from  those  estimates.    These 
estimates are reviewed periodically and as adjustments become necessary, they are reported in earnings 
in the period in which they become available.  

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F-11 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

3.     Summary of Significant Accounting Policies (cont’d) 

f) 

Fair Value of Financial Instruments 

The carrying amounts reported in the accompanying financial statements for cash and cash equivalents, 
note receivable, prepaid expenses and other current assets and accounts payable and accrued expenses 
approximate  fair  value  because  of  the  short-term  maturity  of  these  financial  instruments.    The  fair 
values for marketable securities, warrant liabilities and the put feature on common stock is discussed in 
footnotes 4, 14, and 15, respectively. 

g) 

Income Taxes 

The Company accounts for income taxes in accordance with ASC 740, “Income Taxes”.  Deferred tax 
assets and liabilities are recorded for differences between the financial statement and tax basis of the 
assets and liabilities that will result in taxable or deductible amounts in the future based on enacted tax 
laws and rates.  ASC 740 requires that a valuation allowance be established when it is more likely than 
not that all portions of a deferred tax asset will not be realized.  A review of all positive and negative 
evidence  needs  to  be  considered,  including  a  company’s  current  and  past  performance,  the  market 
environment in which the company operates, length of carryback and carryforward periods and existing 
contracts that will result in future profits.  Income tax expense is recorded for the amount of income tax 
payable or refundable for the period, increased or decreased by the change in deferred tax assets and 
liabilities during the period. 

As a result of the Company’s significant cumulative losses, we determined that it was appropriate to 
establish a valuation allowance for the full amount of our deferred tax assets. 

The calculation of our tax liabilities involves the inherent uncertainty associated with the application of 
complex tax laws.  We are subject to examination by various taxing authorities.  We believe that as a 
result of our losses sustained to date, any examination would result in a reduction of our net operating 
losses rather than a tax liability.  As such, we have not provided for additional taxes estimated under 
ASC 740.  

h)   Loss Per Share 

The Company accounts for loss per share pursuant to ASC 260, “Earnings per Share”, which requires 
disclosure on the financial statements of “basic” and “diluted” loss per share.  Basic loss per share is 
computed by dividing net loss by the weighted average number of common shares outstanding for the 
year.    Diluted  loss  per  share  is  computed  by  dividing  net  loss  by  the  weighted  average  number  of 
common  shares  outstanding  plus  potentially  dilutive  securities  outstanding  for  each  year.  Potentially 
dilutive  securities  include  stock  options  and  warrants.    Diluted  loss  per  share  for  the  years  ended 
December  31,  2010  and  2009  is  the  same  as  basic  loss  per  share  due  to  the  fact  that  the  Company 
incurred  losses  for  all  periods  presented  and  the  inclusion  of  common  share  equivalents  would  be 
antidilutive.  The  following  securities,  presented  on  a  common  share  equivalent  basis,  have  been 
excluded from the per share computations: 

Stock Options 
Warrants 

F-12 

  December 31,  December 31 

2010 

2009   

8,076,795 
5,624,583 

7,715,795   
8,575,243   

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REXAHN PHARMACEUTICALS, INC. 
 (A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

3.  Summary of Significant Accounting Policies (cont’d) 

i) 

Stock-Based Compensation 

In  accordance  with  ASC  718  “Stock  Compensation”  compensation  costs  related  to  share-based 
payment  transactions,  including  employee  stock  options,  are  to  be  recognized  in  the  financial 
statements. In addition, the Company adheres to the guidance set forth within Securities and Exchange 
Commission  (“SEC”)  Staff  Accounting  Bulletin  (“SAB”)  No.  107,  which  provides  the  Staff’s  views 
regarding  the  interaction  between  ASC  718  and  certain  SEC  rules  and  regulations,  and  provides 
interpretations with respect to the valuation of share-based payments for public companies.  

j) 

Impairment of Long-Lived Assets 

In accordance with ASC 360, “Property, Plant and Equipment”, long-lived assets to be held and used 
are  analyzed  for  impairment  whenever  events  or  changes  in  circumstances  indicate  that  the  related 
carrying amounts may not be recoverable.  The Company evaluates at each balance sheet date whether 
events and circumstances have occurred that indicate possible impairment.  If there are indications of 
impairment,  the  Company  uses  future  undiscounted  cash  flows  of  the  related  asset  or  asset  grouping 
over the remaining life in measuring whether the assets are recoverable.  In the event such cash flows 
are  not  expected  to  be  sufficient  to  recover  the  recorded  asset  values,  the  assets  are  written  down  to 
their estimated fair value.  Management determined that an impairment of intangible assets occurred in 
2009 and wrote-off the assets remaining carrying value of $286,132, which is reflected in research and 
development  expenses  in  the  Company’s  statement  of  operations  for  the  year  ended  December  31, 
2009. 

       k)      Concentration of Credit Risk 

The Company does not have significant off-balance sheet risk or credit concentration.  The Company 
maintains  cash  and  short-term  investments  with  major  financial  institutions.    From  time  to  time  the 
Company  has  funds  on  deposit  with  commercial  banks  that  exceed  federally  insured  limits.    The 
balances  are  insured  by  either  the  Federal  Deposit  Insurance  Corporation  or  the  Securities  Investor 
Protection Corporation up to $250,000. At December 31, 2010, the Company’s uninsured cash balance 
was $12,287,487.  

       l)      Reclassification 

Certain  amounts  in  the  prior  year’s  financial  statements  have  been  reclassified  to  conform  with  the 
current year presentation with no net effect on the financial statements. 

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F-13 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

3.     Summary of Significant Accounting Policies (cont’d) 

l)      Recent Accounting Pronouncements Affecting the Company 

Fair Value Measurements 

In  January,  2010,  the  FASB  issued  guidance  which  requires,  in  both  interim  and  annual  financial 
statements,  for  assets  and  liabilities  that  are  measured  at  fair  value  on  a  recurring  basis,  disclosures 
regarding  the  valuation  techniques  and  inputs  used  to  develop  those  measurements.    It  also  requires 
separate  disclosures  of  significant  amounts  transferred  in  and  out  of  Level  1  and  Level  2  fair  value 
measurements  and  a  description  of  the  reasons  for  the  transfers.    This  guidance  is  effective  for  the 
Company beginning January 1, 2011 and is required to be applied prospectively to new or significantly 
modified  revenue  arrangements.    Management  currently  believes  that  the  adoption  of  this  guidance 
will not have a material impact on the Company’s financial statements.  

Milestone Method of Revenue Recognition 

In  April,  2010,  the  FASB  issued  guidance  on  defining  a  milestone  and  determining  when  it  may  be 
appropriate  to  apply  the  milestone  method  of  revenue  recognition  for  research  and  development 
transactions.    Consideration  that  is  contingent  on  achievement  of  a  milestone  in  its  entirety  may  be 
recognized as revenue in the period in which the milestone is achieved only if the milestone is judged 
to meet certain criteria to be considered substantive.  Milestones should be considered substantive in 
their  entirety  and  may  not  be  bifurcated.    An  arrangement  may  contain  both  substantive  and 
nonsubstantive  milestones,  and  each  milestone  should  be  evaluated  individually  to  determine  if  it  is 
substantive.  This guidance is effective on a prospective basis for milestones in fiscal years and interim 
periods within those years, beginning on or after June 15, 2010, with early adoption permitted.  The 
Company is evaluating the impact this guidance may have on its financial statements.  

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F-14 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

4.  Marketable Securities 

Cost and fair value of the Company’s marketable securities are as follows: 

Securities available-for-sale 
     December 31, 2010: 

Cost 
Basis 

Gross 
Unrealized 
Losses 

Fair 
Value 

State and municipal obligations 

  $  2,453,960 

  $ 

(2,340) 

  $  2,451,620 

     December 31, 2009: 

State and municipal obligations 

  $ 

175,000 

  $ 

- 

  $ 

175,000 

Amortized  cost  and  fair  value  at  December  31,  2010  by  contractual  maturity  are  shown  below.    Expected 
maturities will differ from contractual maturities because the Company may redeem certain securities at par. 

Maturity 
1 year or less 
10 years or more 

Cost 
Basis 

Gross 
Unrealized 
Losses 

Fair 
Value 

  $ 

503,960 
1,950,000 

  $ 

(2,340) 
- 

  $ 
501,620 
  $  1,950,000 

   $   2,453,960

  $ 

(2,340) 

  $  2,451,620 

5.  Prepaid Expenses and Other Current Assets 

Deposits on contracts 
Other assets 

December 31, 
2010 

December 31, 
2009 

  $ 

564,074 
142,575 

  $ 

245,476 
75,459 

  $ 

706,649 

  $ 

320,935 

Deposits on contracts consist of deposits on research and development contracts for services that have not yet 
been incurred.  Other assets include prepaid general and administrative expenses such as insurance, rent, and 
consulting services. 

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F-15 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

6.  Note Receivable 

On  June  16,  2010,  Amarex,  LLC  (“Amarex”)  executed  a  note  payable  to  the  Company  in  settlement  of  a 
contract dispute.  The Company settled the case with Amarex for $100,000 less a balance owed of $43,953.  
The principal sum of the note was $56,047, and is included in other income in the Company’s statement of 
operations.  Monthly payments of $2,335 began on September 1, 2010 and will continue until August 1, 2012 
at which time the balance is expected to be paid in full.  The note does not bear interest. Pursuant to the note, 
Amarex shall pay a late charge of five percent (5%) of any past due installment payments if any installment 
payment is not paid within 10 days of its due date.  As of December 31, 2010, all payments were made as 
scheduled. 

As of December 31, 2010, the principal amortization of the note is shown below: 

Principal Amortization 
Within 1 year 
1 year to Maturity Date (August 1, 2012) 

7.  Equipment, Net   

Furniture and fixtures 
Office equipment 
Lab and computer equipment 
Leasehold improvements 

Less Accumulated depreciation 

Net carrying amount 

Expected 
Payment 

  $ 

28,023 
18,682 

  $ 

46,705 

December 31, 
2010 

December 31, 
2009 

 $       32,169 
      77,032 
    429,415 
    110,713 

$      32,169 
  72,385 
428,816 
110,713 

       649,329 
      (525,764) 

     644,083 
    (475,105) 

  $    123,565 

  $  168,978 

Depreciation  expense  was  $50,659  and  $41,604  for  the  years  ended  December  31,  2010  and  2009, 
respectively. 

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F-16 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

8.  Accounts Payable and Accrued Expenses 

Trade payables 
Accrued expenses 
Accrued research and development contract costs 
Payroll liabilities 

9.  Deferred Revenue 

  December 31,  December 31, 

2010 

2009 

  $ 

  $ 

489,527 
18,466 
1,239,233 
73,674 

132,212 
85,470 
427,189 
141,033 

  $  1,820,900 

  $ 

785,904 

In  2003,  the  Company  entered  into  a  collaborative  research  agreement  with  Rexgene  Biotech  Co.,  Ltd. 
(“Rexgene”), a shareholder.  Rexgene is engaged in the development of pharmaceutical products in Asia and 
has agreed to assist the Company with the research, development and clinical trials necessary for registration 
of  the  Company’s  drug  candidate,  Archexin,  in  Asia.    This  agreement  provides  Rexgene  with  exclusive 
rights  to  license,  sublicense,  make,  have  made,  use,  sell  and  import  Archexin  in  Asia.  A  one-time 
contribution to the joint development and research of Archexin of $1,500,000 was paid to the Company in 
2003 in accordance with the agreement.  The amount of revenue from this contribution is being recognized 
as income over the term of the agreement which terminates at the later of 20 years or the term of the patent 
on the licensed product.   

The  Company  is  using  20  years  as  its  basis  for  recognition  and  accordingly  $75,000  was  included  in 
revenues  for  the  years  ended  December  31,  2010  and  2009.    The  remaining  $900,000  and  $975,000  at 
December  31,  2010  and  2009,  respectively,  is  reflected  as  deferred  revenue  on  the  balance  sheet.    The 
contribution is being used in the cooperative funding of the costs of development of Archexin.  Royalties of 
3%  of  net  sales  of  licensed  products  will  become  payable  to  the  Company  on  a  quarterly  basis  once 
commercial sales of Archexin begin. The product is still under development and commercial sales are not 
expected to begin until at least 2012. 

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F-17 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
   
 
 
   
   
 
 
   
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

10.  Other Liabilities 

Deferred Lease Incentive 

On June 29, 2009, the Company entered into a five year office lease agreement as discussed in note 17.  The 
lessor  agreed  to  grant  a  leasehold  improvement  allowance  of  $100,000  to  the  Company  to  be  used  for the 
construction  cost  of  improvements,  architectural  and  engineering  fees,  government  agency  plan  check, 
permit and other fees, sales and use taxes, testing and inspection costs, construction fees and telephone and 
data cabling and wiring in the premises.  The full amount of leasehold improvement allowance had been used 
up  by  the  Company  by  December  31,  2009.    The  Company  accounts  for  the  benefit  of  the  leasehold 
improvement allowance on a straight line basis as a reduction of rental expense over the 5 year lease term. 

The following table sets forth the deferred lease incentive: 

Deferred lease incentive 
Less accumulated amortization 

Balance  

Deferred Office Lease Expense 

December 31,  December 31, 

2010 

2009 

$   100,000 
    (30,000) 

$   100,000 
    (10,000) 

$    70,000       

$     90,000       

The  office  lease  agreement,  discussed  above,  requires  an  initial  annual  base  rent  of  $76,524  with  annual 
increases over the next five years. The Company recognizes rental expense on a straight-line basis over the 
term of the lease, which resulted in a deferred rent liability of $63,117 and $31,670 as of December 31, 2010, 
and 2009, respectively. 

Deferred Lab Lease Expense 

On May 21, 2009, the Company entered into a one year agreement to use lab space commencing on July 1, 
2009.  The lessor granted free rent to the Company for the period from July 1, 2009 to September 30, 2009.  
The Company recognizes rental expense on a straight-line basis over the term of the lease, which resulted in 
a deferred rent liability of $6,831 as of December 31, 2009.  The lease was renewed for one year on June 28, 
2010.  There was no deferred rent liability for the lab lease as of December 31, 2010. 

11.  Net Loss per Common Share 

We compute basic loss per share by dividing net loss by the weighted average number of common shares 
outstanding  and  excluding  any  potential  dilution.    Net  loss  per  common  share  assuming  dilution  was 
computed by reflecting potential dilution from the exercise of stock options and warrants.  As of December 
31, 2010 and 2009, there were stock options and warrants to acquire 13,701,378 and 16,291,038 shares of 
our  common  stock,  respectively.    These  shares  were  excluded  from  the  computations  of  diluted  loss  per 
share because their effect would be anti-dilutive.  

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F-18 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

12.   Common Stock  

The following transactions occurred from March 19, 2001 (inception) to December 31, 2010: 

a)  On May 10, 2001 the Company issued 3,600,000 shares of common stock to the Company’s founders 

for $1. 

b)  On August 10, 2001 the Company issued:  

i) 

1,208,332 shares of common stock to the directors of the Company for cash of $1,450,000. 

ii) 

958,334 shares of common stock to Rexgene for cash of $550,000. 

iii)  360,000  shares  of  common  stock  in  a  private  placement  to  individual  investors  for  cash  of 

$1,080,000. 

These  share  purchases  were  negotiated  by  the  parties  at  various  dates  prior  to  the  August  10,  2001 
share issuance date. 

c)  On  October  10,  2001  the  Company  issued  400,000  shares  of  common  stock  to  Chong  Kun  Dang 
Pharmaceutical  Corp.  (“CKD”)  for  cash  of  $479,991  and  400,000  shares  of  common  stock  to  an 
individual investor for cash of $479,991. 

d)  On  October  10,  2001  the  Company  issued  200,000  shares  of  common  stock  to  CKD  for  cash  of 

$479,985. 

e) 

f) 

Since  inception,  the  Company’s  founders  have  transferred  800,000  shares  of  the  common  stock 
described in a) to officers and directors of the Company. 

In July 2003, the shareholders described in b)(iii) and e) transferred an aggregate of 1,268,332 shares of 
common  stock  to  a  voting  trust.    The  trust  allows  for  the  unified  voting  of  the  stock  by  the  trustees.  
The appointed trustees are senior management of the Company who, together with their existing shares, 
control a majority of the voting power of the Company. 

g)  On August 20, 2003 the Company issued 500,000 shares of common stock to KT&G Corporation for 

cash of $2,000,000. 

h)  On October 29, 2004, an option holder exercised options to purchase shares of the Company’s common 

stock for cash of $1,800 and the Company issued an aggregate of 1,500 shares. 

i) 

Pursuant to the agreement and plan of merger which occurred on May 13, 2005, (i) each share of the 
issued and outstanding common stock of Rexahn, Corp (“Rexahn”) (other than dissenting shares) was 
converted  into  the  right  to  receive  five  shares  of  Rexahn  Pharmaceuticals  common  stock;  (ii)  each 
issued,  outstanding  and  unexercised  option  to  purchase  a  share  of  Rexahn  common  stock  was 
converted into an option to purchase five shares of Rexahn Pharmaceuticals common stock and (iii) the 
par  value  of  Rexahn’s  common  stock  was  adjusted  to  reflect  the  par  value  of  Corporate  Road  Show  
Com Inc. (“CRS”) common stock.  In the acquisition merger, 289,780,000 CRS pre-reverse stock split 
shares were converted into 2,897,802 post-reverse  stock split Rexahn Pharmaceuticals shares, and an 
additional  500,000  post-reverse  stock  split  Rexahn  Pharmaceuticals  shares  were  issued  to  a  former 
executive  of  CRS.    All  shares  and  earnings  per  share  information  have  been  retroactively  restated  in 
these financial statements. 

F-19 

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REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

12.  Common Stock (cont’d) 

j)  On August 8, 2005, the Company issued, in a transaction exempt from registration under the Securities 

Act, 4,175,000 shares of common stock at a purchase price of $2.00 per share. 

k)  On October 3, 2005, the Company issued 7,000 shares of common stock for $21,877 and $7,500 cash 

in exchange for services. 

l)  On December 2, 2005, the holders of a convertible note, representing $1,300,000 aggregate principal 
amount, exercised their option to convert the entire principal amount of the note into the Company’s 
common  stock.    Based  on  a  $2.00  per  share  conversion  price,  the  holders  received  an  aggregate  of 
650,000 shares. 

m)  On December 27, 2005, option holders exercised options to purchase shares of the Company’s common 

stock for cash of $9,600 and the Company issued an aggregate of 40,000 shares. 

n)  On  February  22,  2006,  an  option  holder  exercised  options  to  purchase  shares  of  the  Company’s 

common stock for cash of $1,200 and the Company issued an aggregate of 5,000 shares. 

o)  On April 12, 2006, an option holder exercised options to purchase shares of the Company’s common 
stock for cash of $3,409 and the Company issued an aggregate of 14,205 shares.  On the same date, the 
Company agreed to repurchase common stock from the option holder based on the then market price 
for treasury in exchange for the aggregate purchase price of $28,410 in cash.   

p)  On May 13, 2006, holders of the $3,850,000 convertible notes issued on February 28, 2005, exercised 
their rights to convert the entire principal amount of the notes into shares of the Company’s common 
stock.   Based on a $1.00 per share conversion price, the Company issued 3,850,000 shares of common 
stock in connection with the conversion. 

q)  On October 9, 2006, an option holder exercised options to purchase shares of the Company’s common 

stock for cash of $2,400 and the Company issued an aggregate of 10,000 shares.   

r)  On  November  19,  2006,  an  option  holder  exercised  options  to  purchase  shares  of  the  Company’s 

common stock for cash of $1,800 and the Company issued an aggregate of 7,500 shares. 

s)  On  December  19,  2006,  an  option  holder  exercised  options  to  purchase  shares  of  the  Company’s 

common stock for cash of $6,000 and the Company issued an aggregate of 25,000 shares. 

t)  On April 18, 2007, an option holder exercised options to purchase shares of the Company’s common 

stock for cash of $14,400 and the Company issued an aggregate of 18,000 shares. 

u)  On  July  23,  2007,  an  option  holder  exercised  options  to  purchase  shares  of  the  Company’s  common 

stock for cash of $12,000 and the Company issued an aggregate of 15,000 shares. 

v)  On  September  27,  2007,  an  option  holder  exercised  options  to  purchase  shares  of  the  Company’s 

common stock for cash of $15,600 and the Company issued an aggregate of 19,500 shares. 

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F-20 

 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

12.   Common Stock (cont’d) 

w)  On December 18, 2007, the Company issued 4,857,159 units at a price $1.40 per share for total gross 
proceeds of $6,800,023.  Investors also were issued one warrant for every five shares purchased.  One 
warrant will entitle the holder to purchase an additional share of common stock at a purchase price of 
$1.80 at any time over a period of three years from the date of the closing. The Company has recorded 
the warrants as liabilities at fair value  as discussed in footnote 14.Private placement closing costs of 
$139,675 were recorded as a reduction of the issuance proceeds.  Private placement costs also consist 
of  107,144  warrants,  valued  at  $138,326,  and  were  recorded  as  a  financing  expense.  The  Company 
extended anti-dilutive protection to the investors. The anti-dilution protection provision is structured in 
a way that is designed to protect a holder’s position from being diluted and contains a price protection 
based on a mathematical calculation, and is recorded as a liability at fair value, as discussed in footnote 
15.      The  Company  revalues  these  liabilities  each  reporting  period,  with  the  unrealized  gain  (loss) 
recorded as other income (expense). 

A summary of the allocation of the proceeds of the offering is shown below: 

Gross Proceeds: 

Allocated to liabilities: 
     Warrant liabilities 
     Put feature on common stock 
Total allocated to liabilities 

Allocated to equity: 
    Common stock and additional paid-in capital 

Allocated to expense: 
     Financing expense 

$   6,800,023

       1,392,476
4,401,169
5,793,645

1,144,704

(138,326)

Total allocated gross proceeds: 

        $    6,800,023

x)  On  December  27,  2007,  an  option  holder  exercised  options  to  purchase  shares  of  the  Company’s 

common stock for cash of $18,000 and the Company issued an aggregate of 75,000 shares. 

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F-21 

 
 
 
 
  
 
 
 
      
 
 
  
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

12.   Common Stock (cont’d) 

y)  On  March  20,  2008,  the  Company  issued  642,858  units  consisting  of  one  share  of  the  Company’s 
common  stock  and one  warrant  for  every  five  common  shares  purchased  in  a  private  placement  at  a 
price  of  $1.40  per  unit  for  total  gross  proceeds  of  $900,001.    One  warrant  will  entitle  the  holder  to 
purchase an additional share of common stock at a price of $1.80 at any time over a period of three 
years from the date of the private placement, and is recorded as a liability at fair value.  The Company 
extended anti-dilution protection to investors, and the provision is structured in a way that is designed 
to  protect  the  holder’s  position  from  being  diluted  and  contains  a  price  based  on  a  mathematical 
computation. 

A summary of the allocation of the proceeds of the offering is shown below:  

Gross Proceeds: 

Allocated to liabilities: 
     Warrant liabilities 
     Put feature on common stock 
Total allocated to liabilities 

$   900,001

       190,917
553,569
744,486

Allocated to common stock and additional paid-in capital 
Total allocated gross proceeds: 

155,515
        $     900,001

z)  On May 30, 2008, an option holder exercised options to purchase shares of the Company’s common 

stock for cash of $7,200 and the Company issued an aggregate of 30,000 shares. 

aa)  On  June  2,  2008,  an  option  holder  exercised  options  to  purchase  shares  of  the  Company’s  common 

stock for cash of $12,000 and the Company issued an aggregate of 50,000 shares. 

ab)  On June 30, 2008, an option holder exercised options to purchase shares of the Company’s common 

stock for cash of $12,000 and the Company issued an aggregate of 10,000 shares. 

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F-22 

 
 
 
 
 
 
 
 
      
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

12.  Common Stock (cont’d) 

ac)   On June 5, 2009 the Company closed on a purchase agreement to issue 2,857,143 shares of common 
stock at a price of $1.05 per share to an institutional investor for total gross proceeds of $3,000,000 and 
incurred $289,090 of stock issuance costs.  The investor was also issued: 

1)  Series I warrants to purchase 2,222,222 shares of common stock at a purchase price of $1.05 

per share at any time before September 3, 2009; 

2)  Series II warrants to purchase 1,866,666 shares of common stock at a purchase price of $1.25 

per share at any time from December 3, 2009 to June 5, 2012; and 

3)  Series  III  warrants  to  purchase  1,555,555  shares  of  common  stock  at  a  purchase  price  of 

$1.50 per share at any time from December 3, 2009 to June 5, 2014. 

The  closing  costs  included  142,857  warrants  valued  at  $122,257  and  were  recorded  as  a  financing         
expense.  All warrants issued from this purchase agreement are recorded as liabilities at fair value. 

The  Company  incurred  a  derivative  loss  upon  issuance  of  these  warrants,  as  the  fair  value  of  the  
warrants at inception was greater than the proceeds received from the investor.  The derivative loss was 
combined with unrealized gains (losses) for the year ended December 31, 2009. 

        A summary of the allocation of the proceeds of the offering is shown below:  

Gross Proceeds: 

Allocated to liabilities: 
    Warrant liabilities 

Allocated to equity: 
    Common stock and additional paid-in capital 

Allocated to expense: 
    Financing expense 
    Derivative loss at inception 
Total allocated to expense 

$   3,000,000

       3,451,194

-

(122,257)
(328,937)
(451,194)

Total allocated gross proceeds: 

         $   3,000,000

ad)  On  June  9,  2009,  the  Company  issued  1,833,341  shares  of  common  stock  and  862,246  warrants  to 
purchase common stock at a purchase price of $1.05 per share to existing stockholders pursuant to the 
anti-dilution  protection  provisions  of  the  private  placements  transacted  on  December  18,  2007  and 
March  20,  2008.    The  issuance  of  additional  warrants  resulted  in  an  increase  in  fair  value  of 
approximately $422,300.   

ae)  On  September  4,  2009,  an  option  holder  exercised  options  to  purchase  shares  of  the  Company’s 

common stock for cash of $3,600 and the Company issued an aggregate of 15,000 shares. 

F-23 

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REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

12.  Common Stock (cont’d) 

af)  On September 21, 2009, the Company issued 3,102,837 shares of common stock at a purchase price of 
$1.13 per share to an institutional investor for net proceeds of $3,371,340, which includes $128,659 of 
stock issuance costs.  

ag)  On  October  23,  2009,  the  Company  closed  on  a  purchase  agreement  to  issue  6,072,383  shares  of 
common  stock  at  a  price  of  $0.82  per  share  to  five  institutional  investors  for  gross  proceeds  of 
$5,000,000, which includes $351,928 of stock issuance costs.  The investors were also issued warrants 
to purchase 2,125,334 shares of common stock at a purchase price of $1.00 per share, exercisable on or 
after the date of delivery until the five-year anniversary, and were recorded as liabilities at fair value. 
The  closing  costs  included  245,932  warrants  valued  at  $101,693  and  were  recorded  as  a  financing 
expense.       

        A summary of the allocation of the proceeds of the offering is shown below:  

Gross Proceeds: 

Allocated to liabilities: 
     Warrant liabilities 

Allocated to equity: 
    Common stock and additional paid-in capital 

Allocated to expense: 
    Financing expense 

$   5,000,000

       1,114,627

3,987,066

(101,693)

Total allocated gross proceeds: 

         $   5,000,000

ah)  On October 23, 2009, the Company issued 2,018,143 shares of common stock and 569,502 warrants to 
purchase common stock at a purchase price of $0.82 per share to existing stockholders pursuant to anti-
dilution protection provisions of the private placements transacted on December 24, 2007 and March 
20,  2008.  The  issuance  of  additional  warrants  resulted  in  an  increase  in  fair  value  of  approximately 
$476,200. 

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F-24 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

12.  Common Stock (cont’d) 

ai)  On  February  12,  2010,  the  Company  entered  into  two  consulting  agreements  pursuant  to  which  the 
Company  issued  300,000  shares  of  common  stock  upon  the  execution  of  the  agreements.    Upon  the 
extension  of  the  term,  200,000  shares  of  common  stock  for  each  month  will  be  issued  until  the 
termination of services. 

The following table lists the issuances of shares by the Company under the consulting agreement: 

Date of Issuance 
February 12, 2010 
May 24, 2010 
June 15, 2010 
August 2, 2010 
September 21, 2010 
October 21, 2010 
November 11, 2010 

Number of 
Shares Issued 
300,000 
200,000 
200,000 
400,000 
200,000 
200,000 
200,000 

Total 

1,700,000 

Market Value 
Per Share  

Total Market Value of Share 
Issuance 

$        1.22
1.40
1.15
1.37
1.20
1.16
1.06

$       366,000
280,000
230,000
548,000
240,000
232,000
212,000

$   2,108,000

The  market  value  of  these  shares  was  recorded  as  an  expense  and  is  reflected  in  general  and 
administrative expenses in the Company’s statement of operations.  The agreements were terminated 
by the Company on November 11, 2010. 

aj) 

In  March  2010,  warrant  holders  exercised  warrants  to  purchase  shares  of  Company’s  common  stock 
for cash of $1,297,001 and the Company issued an aggregate of 1,197,001 shares.   

ak)  In March 2010, option holders exercised options to purchase shares of Company’s common stock for 

cash of $21,240 and the Company issued an aggregate of 48,000 shares. 

al) 

In  April  2010,  warrant  holders  exercised  their  warrants  to  purchase  shares  of  Company’s  common 
stock for cash of $1,966,375 and the Company issued an aggregate of 1,595,825 shares.   

am)  On April 20, 2010, an option holder exercised options to purchase shares of Company’s common stock 

for cash of $86,000 and the Company issued an aggregate of 107,500 shares. 

an)  In  May  2010,  warrant  holders  exercised  890,051  cashless  warrants  to  obtain  shares  of  Company’s 

common stock and the Company issued an aggregate of 547,674 shares. 

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F-25 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

12.  Common Stock (cont’d) 

ao)  On  June  30,  2010,  the  Company  entered  into  a  purchase  agreement  to  issue  6,666,667  shares  of 
common  stock  at  a  price  of  $1.50  per  share  to  investors  for  gross  proceeds  of  $10,000,000,  which 
includes  $681,773  of  stock  issuance  costs.    The  investors  were  also  issued  warrants  to  purchase 
2,000,000  shares  of  common  stock  at  an  exercise  price  of  $1.90  per  share.    The  warrants  became 
immediately exercisable on the date of delivery until the four-year anniversary of the date of issuance.  
These warrants have been valued at $1,800,800 and recorded as warrant liabilities.  The closing costs 
included 200,000 warrants valued at $180,080 and were recorded as a financing expense.   

Gross Proceeds: 

Allocated to liabilities: 
     Warrant liabilities 

Allocated to equity: 
    Common stock and additional paid-in capital 

Allocated to expense: 
    Financing expense 

$           10,000,000

       1,980,880

8,199,200

(180,080)

Total allocated gross proceeds: 

$           10,000,000

ap)   In November 2010, warrant holders exercised 936,883 cashless warrants to obtain shares of Company’s 

common stock and the Company issued an aggregate of 247,491 shares. 

aq)   In December 2010, warrant holders exercised 530,900 cashless warrants to obtain shares of Company’s 

common stock and the Company issued an aggregate of 126,195 shares. 

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F-26 

 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

13.  Stock-Based Compensation 

On August 5, 2003, the Company established a stock option plan (the “Plan”). Under the Plan, the Company 
grants  stock  options  to  key  employees,  directors  and  consultants  of  the  Company.  For  all  grants  prior  to 
September 12, 2005 and grants to employees of the Company after September 12, 2005, the vesting period is 
30%  on  the  first  anniversary  of  the  grant  date,  an  additional  30%  on  the  second  anniversary  and  the 
remaining 40% on the third anniversary. Options expire between five and ten years from the date of grant. 

For  grants  to  non-employee  consultants  of  the  Company  after  September  12,  2005,  the  vesting  period  is 
between one to three years, subject to the fulfillment of certain conditions in the individual stock option grant 
agreements,  or  100%  upon  the  occurrence  of  certain  events  specified  in  the  individual  stock  option  grant 
agreements.  Options  authorized  for  issuance  under  the  Plan  total  17,000,000  after  giving  effect  to  an 
amendment  to  the  Plan  approved  at  the  Annual  Meeting  of  the  Stockholders  of  the  Company  on  June  2, 
2006.  At December 31, 2010, 8,426,000 shares of common stock were available for issuance. 

Prior to adoption of the Plan, the Company made restricted stock grants. During 2003 all existing restricted 
stock grants were converted to stock options. The converted options maintained the same full vesting period 
as the original restricted stock grants. 

Accounting for Employee Awards 

The Company’s results of operations for the years ended December 31, 2010 and 2009 include share-based 
employee  compensation  expense  totaling  $470,366,  and  $565,150  respectively.  Such  amounts  have  been 
included  in  the  statement  of  operations  in  general  and  administrative  and  research  and  development 
expenses.  No  income  tax  benefit  has  been  recognized  in  the  statement  of  operations  for  share-based 
compensation arrangements as the Company has provided for a 100% valuation allowance on its deferred tax 
assets. 

Employee stock option compensation expense is the estimated fair value of options granted amortized on a 
straight-line basis over the requisite vesting service period for the entire portion of the award.  

Accounting for Non-Employee Awards 

Stock  compensation  expenses  related  to  non-employee  options  were  $114,291  and  $(67,619)  for  the  years 
ended  December  31,  2010  and  2009,  respectively.  Such  amounts  have  been  included  in  the  statement  of 
operations in general and administrative and research and development expenses. 

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F-27 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

13.  Stock-Based Compensation (cont’d) 

Summary of Stock Compensation Expense Recognized 

Total  stock-based  compensation  recognized  by  the  Company  in  the  years  ended  December  31,  2010  and 
2009, and the period from inception (March 19, 2001) to December 31, 2010, all of which relates to stock 
options is as follows: 

Year Ended December 31, 
2009 
2010 

Inception 
(March 19,2001) to 
December 31, 2010 

Statement of operations line item: 
General and administrative: 

Payroll 
Consulting and other professional fees 

  $  393,425
93,581  

  $  443,013 
(67,644) 

$       1,993,516
759,957

Research and development: 

Payroll 
Consulting and other professional fees 

  76,941
  20,710

  122,137 
  25 

876,296
1,309,253

Total 

  $  584,657

  $  497,531 

$      4,939,022

Summary of Stock Option Transactions 

There were a total of 725,000 stock options granted with exercise prices ranging from $1.17-$1.33, fair value 
on the date of grant of $616,000, and a weighted average grant date fair value of $0.85 during the year ended 
December 31, 2010.  A total of 180,000 stock options were granted with exercise prices ranging from $0.73 - 
$1.28, grant date fair value of $134,917, and a weighted average grant date fair value of $0.75 during the year 
ended  December  31,  2009.    The  fair  value  of  options  at  the  date  of  grant  was  estimated  using  the  Black-
Scholes  option  pricing  model.  The  expected  volatility  is  based  upon  historical  volatility  of  the  Company’s 
stock. The expected term is based upon the simplified method as allowed under SAB 107. 

The assumptions made in calculating the fair values of options are as follows:  

Black-Scholes weighted average assumptions 

Expected dividend yield 
Expected volatility 
Risk free interest rate 
Expected term (in years) 

                        Year Ended December 31, 

2010 

2009 

   0% 
103 - 107% 
  0.26 – 2.40% 
1 - 5 years 

   0% 
100 - 108% 
0.51 - 2.55% 
1 - 5 years 

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F-28 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

13. Stock-Based Compensation (cont’d) 

The following table summarizes the employee and non-employee share-based transactions: 

Outstanding at 
January 1 
Granted 
Exercised 
Cancelled 

2010 

2009 

Shares Subject 
to Options 

Weighted Avg. 
Exercise Prices 

Shares Subject    
to Options 

Weighted Avg. 
Exercise Prices 

7,715,795 
725,000 
(155,500) 
(208,500) 

0.98 
$ 
$ 
1.26 
$      0.68 
        $     1.19 

7,760,795 
  180,000 
(15,000) 
(210,000) 

$ 
$ 
$ 
       $ 

1.01 
1.09 
0.24 
1.71 

Outstanding at December 31 

8,076,795 

$ 

1.01 

 7,715,795 

$ 

0.98 

The following table summarizes information about stock options outstanding as of December 31, 2010 and 
2009: 

Outstanding at 
December 31, 2010 

Exercisable at 
December 31, 2010 

Outstanding at 
December 31, 2009 

Exercisable at 
December 31, 2009 

Shares Subject to 
Options 

Weighted Avg. 
Exercise Prices 

Weighted 
Average 
Remaining 
Contractual Term 

Aggregate 
Intrinsic Value 

8,076,795 

$ 

1.01 

5.4 years 

$  2,198,790 

6,762,795 

$ 

1.00 

4.8 years 

$  2,023,980 

7,715,795 

$     0.98 

6.1 years 

$    352,350 

6,289,295 

$     0.99 

5.3 years 

$    352,350 

The total intrinsic value of the options exercised was $239,560 and $9,300, respectively, for the years ended 
December 31, 2010 and 2009, respectively.  The weighted average fair value of the options vested was $0.76 
and $0.54 for the years ended December 31, 2010, and 2009, respectively.  

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F-29 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

13.  Stock-Based Compensation (cont’d) 

A summary of the Company’s unvested shares as of December 31, 2010 and changes during the year ended 
December 31, 2010 is presented below: 

Unvested at January 1, 2010 
Granted 
Vested 
Cancelled 

Unvested at December 31, 2010 

2010 

Weighted 
Average Fair 
Value at Grant 
Date

Subject to 
Options 

 1,426,500 
  725,000 
(675,500) 
(162,000) 

$ 
$ 
$ 
       $ 

0.72 
0.85 
0.76 
0.87 

 1,314,000 

$ 

0.77 

As of December 31, 2010 and 2009, there was $685,636 and $877,048 of total unrecognized compensation 
cost, respectively, related to all unvested stock options, which is expected to be recognized over a weighted 
average vesting period of 1.4 years and 1.7 years, respectively.   

14. Warrants  

As at  December 31, 2010, warrants to  purchase 5,624,583 shares were outstanding, having exercise prices 
ranging from $0.82 to $1.90 and expiration dates ranging from March 20, 2011 and October 19, 2014.    

2010 

2009 

Balance at January 1 
Issued during the period 
Exercised during the period 
Expired during the period 

Number of 
warrants 

8,575,243 
2,200,000    

(5,150,660)
-

Weighted average 
exercise price 
 1.10  
  1.90 
1.01 

       $  
$ 
$ 
       $     - 

Number of 
warrants 
1,207,151 
  9,590,314 
   - 
(2,222,222) 

Weighted average 
exercise price 
$  1.80 
$  1.14 
- 
$ 

       $  1.05 

Balance at December 31 

5,624,583 

$  1.48 

 8,575,243 

$  1.10 

At December 31, 2010 and 2009, the average remaining contractual life of the outstanding warrants was 3.4 
years and 2.7 years, respectively.  

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F-30 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

14. Warrants (cont’d) 

The warrants, which were issued to investors in the December 2007, March 2008, May 2009, October 2009, 
and June 2010 offerings, contain a provision for net cash settlement in the event that there is a fundamental 
transaction  (contractually  defined  as  a  merger,  sale  of  substantially  all  assets,  tender  offer,  or  share 
exchange).      If  a  fundamental  transaction  occurs  in  which  the  consideration  issued  consists  principally  of 
cash or stock in a non-public company, then the warrant holder has the option to receive cash, equal to the 
fair value of the remaining unexercised portion of the warrant.  Due to this contingent redemption provision, 
the  warrants  require  liability  classification  in  accordance  with  ASC  480,  “Distinguishing  Liabilities  from 
Equity,”  (“ASC  480”)  and  are  recorded  at  fair  value.    In  addition,  these  warrants  are  not  indexed  to  the 
Company’s  stock,  and  therefore  also  require  liability  classification  under  ASC  815,  “Derivatives  and 
Hedging,” (ASC 815). 

ASC  820  provides  requirements  for  disclosure  of  liabilities  that  are  measured  at  fair  value  on  a  recurring 
basis  in  periods  subsequent  to  the  initial  recognition.    Fair  values  for  warrants  are  determined  using  the 
Binomial  Lattice  (“Lattice”)  valuation  technique.  The  Lattice  model  provides  for  dynamic  assumptions 
regarding  volatility  and  risk-free  interest  rates  within  the  total  period  to  maturity.  Accordingly,  within  the 
contractual term, the Company provided multiple date intervals over which multiple volatilities and risk free 
interest  rates  were  used.  These  intervals  allow  the  Lattice  model  to  project  outcomes  along  specific  paths 
which consider volatilities and risk free rates that would be more likely in an early exercise scenario.  

Significant assumptions are determined as follows:  

Trading market values—Published trading market values;  
Exercise price—Stated exercise price;  
Term—Remaining contractual term of the warrant;  
Volatility—Historical trading volatility for periods consistent with the remaining terms;  
Risk-free  rate—Yields  on  zero  coupon  government  securities  with  remaining  terms  consistent  with  the 
remaining terms of the warrants.  

Due to the fundamental transaction provision, which could provide for early redemption of the warrants, the 
model  also  considered  the  probability  the  Company would  enter  into  a  fundamental  transaction  during  the 
remaining term of the warrant. Since the Company is still in its development stage and is not yet achieving 
positive cash flow, management believes the probability of a fundamental transaction occurring over the term 
of  the  warrant  is  approximately  5%.    For  valuation  purposes,  the  Company  also  assumed  that  if  such  a 
transaction did occur, it was more likely to occur towards the end of the term of the warrants. 

2.Financial_Statements.pdf   31

2.Financial_Statements.pdf   31

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F-31 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

14. Warrants (cont’d) 

The  warrants  issued  in  December  2007  and  March  2008  are  not  only  subject  to  traditional  anti-dilution  
protection,  such  as  stock  splits  and  dividends,  but  they  are  also  subject  to  down-round  anti-dilution 
protection. Accordingly, if the Company sells common stock or common stock indexed financial instruments 
below the stated exercise price, the exercise price related to these warrants will adjust to that lower amount.  
The Lattice model used to value the warrants with down-round anti-dilution protection provides for multiple, 
probability-weighted  scenarios  at  the  stated  exercise  price  and  at  five  additional  decrements/scenarios  on 
each  valuation  date  in  order  to  encompass  the  value  of  the  anti-dilution  provisions  in  the  estimate  of  fair 
value  of  the  warrants,  Calculations  were  performed  at  the  stated  exercise  price  and  at  five  additional 
decrements/scenarios  on  each  valuation  date.  The  calculations  provide  for  multiple,  probability-weighted 
scenarios reflecting decrements that result from declines in the market prices. Decrements are predicated on 
the trading market prices in decreasing ranges below the contractual exercise price. For each valuation date, 
multiple Binomial Lattice calculations were performed which were probability weighted by considering both 
the Company’s (i) historical market pricing trends, and (ii) an outlook for whether or not the Company may 
need  to  issue  equity  or  equity-indexed instruments  in  the  future  with  a  price  less  than  the  current  exercise 
price. 

The following table summarizes the fair value of the warrants as of the balance sheet date: 

Fair Values: 
December 18, 2007 financing  
March 20, 2008 financing 
June 5, 2009 financing: 
     Series I warrants 
     Series II warrants 
     Series III warrants 
     Warrants to placement agent 
October 23, 2009 financing:  
     Warrants to institutional investors 
     Warrants to placement agent 
June 30, 2010 financing 
Total: 

December 31, 
2010 

$                     -   
              123,558   

December 31, 
2009 

Transaction Date 
$        830,978  $            1,392,476 
       190,917 

       104,752 

- 
- 
751,022 
69,032 

- 
509,973 
559,689 
54,157 

707,111 
1,315,626 
1,306,200 
122,257 

694,377 
111,241 
1,217,480 
$        2,966,710 

944,923 
    95,004 
- 
$         3,099,476 

1,012,934 
101,693 
1,980,880 
$           8,130,094 

Warrants issued to the placement agents in the December 18, 2007 and June 30, 2010 financings are included 
with  the  warrants  to  investors  as  they  have  identical  exercise  prices  and  terms.    Warrants  issued  to  the 
placement agents in the June 5, 2009 and October 23, 2009 offerings have different exercise prices and terms 
than the warrants issued to the investors and are therefore disclosed separately. 

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2.Financial_Statements.pdf   32

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F-32 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

14. Warrants (cont’d) 

The following table summarizes the number of shares indexed to the warrants as of the balance sheet date: 

Number of Shares indexed: 
December 18, 2007 financing  
March 20, 2008 financing 
June 5, 2009 financing: 
     Series I warrants 
     Series II warrants 
     Series III warrants 
     Warrants to placement agent 
October 23, 2009 financing:  
     Warrants to institutional investors 
     Warrants to placement agent 
June 30, 2010 financing 
Total: 

December 31, 
2010 

           -   
              281,065   

December 31, 
2009 
        2,357,834 
       281,065 

Transaction Date 
          1,078,579 
       128,572 

- 
- 
1,555,555 
132,143 

- 
1,866,666 
1,555,555 
142,857 

2,222,222 
1,866,666 
1,555,555 
142,857 

1,228,333 
227,487 
2,200,000 
      5,624,583 

2,125,334 
    245,932 
- 
       8,575,243 

2,125,334 
245,932 
2,200,000 
         11,565,717 

The assumptions used in calculating the fair values of the warrants are as follows:  

December 18, 2007 financing: 
Trading market prices 
Estimated future volatility 
Dividend 
Estimated future risk-free rate 
Equivalent volatility 
Equivalent risk-free rate 
Estimated additional shares to be issued 
  upon dilutive event 

March 20, 2008 financing: 
Trading market prices 
Estimated future volatility 
Dividend 
Estimated future risk-free rate 
Equivalent volatility 
Equivalent risk-free rate 
Estimated additional shares to be issued 
  upon dilutive event 

June 5, 2009 financing: 
Trading market prices 
Estimated future volatility 
Dividend 
Estimated future risk-free rate 
Equivalent volatility 
Equivalent risk-free rate 

December 31, 
2010 

$           - 
- 
- 
- 
- 
- 
- 

December 31, 
2009 
       $        0.68 
102% 
- 
0.47% 
100% 
0.15% 
629,264 

Transaction Date 
       $        1.75 
143% 
- 
3.27% 
106% 
3.26% 
98,838 

December 31, 
2010 
              $    1.12   
75% 
- 
0.47% 
42% 
0.12% 
25,462 

December 31, 
2009 
       $        0.68 
132% 
- 
0.47% 
96% 
0.24% 
75,011 

Transaction Date 
       $        2.14 
142% 
- 
1.95% 
97% 
1.31% 
7,479 

December 31, 
2010 
              $    1.12   
94-100% 
- 
1.84-4.18% 
72-73% 
0.52% 

December 31, 
2009 
       $        0.68 
89-100% 
- 
1.81-4.18% 
91-95% 
0.58-1.11% 

Transaction Date 
       $        1.14 
100% 
- 
0.63-4.31% 
103-117% 
.20-1.44% 

F-33 

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2.Financial_Statements.pdf   33

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REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009  

14. Warrants (cont’d) 

October 23, 2009 financing: 
Trading market prices 
Estimated future volatility 
Dividend 
Estimated future risk-free rate 
Equivalent volatility 
Equivalent risk-free rate 

June 30, 2010 financing: 
Trading market prices 
Estimated future volatility 
Dividend 
Estimated future risk-free rate 
Equivalent volatility 
Equivalent risk-free rate 

December 31, 
2010 
              $    1.12   
100% 
- 
1.84% 
65-74% 
0.38-.58% 

December 31, 
2009 
       $        0.68 
74-100% 
- 
2.82-4.18% 
95-96% 
0.86-1.27% 

Transaction Date 
       $        0.69 
100% 
- 
2.63-3.80% 
98-99% 
.93-1.16% 

December 31, 
2010 
              $    1.12   
67%% 
- 
1.84% 
89% 
0.52% 

December 31, 
2009 

$            - 
- 
- 
- 
- 
- 

Transaction Date 
       $        1.43 
100% 
- 
1.78% 
98% 
0.59% 

Changes in the fair value of the warrant liabilities, carried at fair value, as reported as “unrealized gain (loss) 
on   fair value of warrants” in the statement of operations: 

December 18, 2007 financing  
March 20, 2008 financing 
June 5, 2009 financing: 
     Series I warrants 
     Series II warrants 
     Series III warrants 
     Warrants to placement agent 
     Derivative loss at inception 
October 23, 2009 financing:  
     Warrants to institutional investors 
     Warrants to placement agent 
June 30, 2010 financing 
Total: 

Year Ended 
December 31, 
2010 

Year Ended 
December 31, 
2009 

Cumulative from 
March 19, 2001 
(Inception) to 
December 31, 
2010 

$         (510,776)    $        (243,841) 
       (36,196) 
             (18,806)  

$            50,722 
       67,359 

- 
(2,996,828) 
(191,333) 
(29,255) 
- 

707,111 
805,653 
746,511 
68,100 
(328,937) 

707,111 
(2,191,175) 
555,178 
38,845 
(328,937) 

(798,694) 
(40,854) 
763,400 
$      (3,823,146) 

68,011 
    6,689 
- 
$         1,793,101 

(730,683) 
(34,165) 
763,400 
$         (1,102,345) 

2.Financial_Statements.pdf   34

2.Financial_Statements.pdf   34

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F-34 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009  

15.  Put Feature on Common Stock  

The Anti-dilution provision extended in the December 2007 and March 2008 financings is a financial instrument 
separate and apart from the share. It is a freestanding written put (a put on our common stock) As an enterprise 
value put, the contracts’ value moves inversely with the value of the underlying common stock which, under ASC 
480,  is  not  consistent  with  the  general  concepts  or  criterion  for  equity  classified  financial  instruments. 
Accordingly, the written put was required to be classified as a liability under ASC 480 and recorded at fair value 
each  reporting  period,  while  the  common  stock  achieved  equity  classification.  Changes  in  the  fair  value  of  the 
anti-dilution make-whole provision are reported as “unrealized gain (loss) on fair value of put feature on common 
stock.” 

The  anti-dilution  make-whole  provisions  associated  with  the  common  stock,  were  valued  using  a  probability–
weighting  of  put  values  provided  by  the  Lattice  model.    Additional  value  would  result  from  the  put  upon  an 
increase in the exercise price or upon decrease of the trading market price in the future. Since the exercise price is 
based on the actual sales price of the stock issued, it is not subject to adjustment unless there is an actual dilutive 
event. Therefore, the mechanism for determining the value of the put was to adjust the stock price input into the 
Lattice  model  based  on  the  Company’s  estimated  future  stock  price.    A  Random  Walk  Brownian  Motion 
Stochastic Process (“Brownian”) technique was used to estimate the market price at several points in the future 
(e.g. at inception, 6 months, 12 months, 18 months and 24 months) over the term of the put to determine if the 
stock  price  will  be  expected  to  decrease  over  the  related  interval  of  time.  Brownian  is  a  continuous  stochastic 
process that is widely used in financing for modeling random behavior that evolves over time, and a stochastic 
process is a sequence of events or paths generated by probabilistic laws. At each interval, the Brownian technique 
was run and the simulation returned the mean stock price (the “expected stock price”).  

Expected  stock  prices  returned  from  the  stochastic  model  were  then  input  into  the  Binomial  Lattice  model  to 
provide  a  put  value  at  each  of  the  expected  price  and  these  values  were  probability  weighted  to  determine  the 
overall fair value of the anti-dilution make-whole provision. The term was based on the remaining term of the put 
(two  years  at  inception)  and  the  inputs  for  volatility  and  interest  rate  were  based  on  projected  volatility  and 
interest rate in the future over the remaining term.  

The following table summarizes the fair value of the Anti-dilution provision recorded at fair value as liabilities: 

Fair Values: 
December 18, 2007 financing 
March 20, 2008 financing 
Total: 

December 31, 
2010 

$                  -   
              -   
$                  -   

December 31, 
2009 

Transaction Date  
$                   -    $            4,401,169 
       553,569 
$           4,954,738 

       97,713 
$         97,713 

The following table summarizes the number of shares indexed to the Anti-dilution provision at the balance sheet 
date: 

Number of Shares indexed: 
December 18, 2007 financing 
March 20, 2008 financing 
Total: 

December 31, 
2010 

December 31, 
2009 

           -   
              -   
      - 

        - 
       642,858 
       642,858 

Transaction Date  
          4,857,159 
       642,858 
         5,500,017 

F-35 

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REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009  

15. Put Feature on Common Stock (cont’d) 

Since the Anti-dilution provisions expired on December 18, 2009 and March 20, 2010, there is no liability as of 
December 31, 2010. 

The assumptions used in calculating the fair values of the Anti-dilution provision were as follows: 

December 18, 2007 financing: 
Trading market prices 
Estimated future stock price 
Estimated future volatility 
Dividend 
Estimated future risk-free rate 

March 20, 2008 financing: 
Trading market prices 
Estimated future stock price 
Estimated future volatility 
Dividend 
Estimated future risk-free rate 

December 31, 
2010 

December 31, 
2009 

                    -   
- 
- 
- 
- 

                    -   
                    -   
                    -   
                    -   
                    -   

Transaction Date  
       $        1.75 
$0.98-$1.75 
143% 
- 
3.14% 

December 31, 
2010 

                    -   
                    -   
                    -   
                    -   
                    -   

December 31, 
2009 
       $   0.68 
       $   0.68 
37% 
- 
0.06% 

Transaction Date  
       $        2.14 
$1.36-$2.10 
142% 
- 
1.85% 

Changes in the fair value of the Anti-dilution provision, carried at fair value, as reported as “unrealized gain 
(loss) on fair value of put” in the statement of operations: 

December 18, 2007 financing 
March 20, 2008 financing 
Total: 

Cumulative from 
March 19, 2001 
(Inception) to 
December 31, 
2010 

Year Ended 
December 31, 
2010 

Year Ended 
December 31, 
2009 
$                       -    $        1,794,554  $            2,148,418 
       120,625 
       167,121 
$           2,315,539 
$         1,915,180 

             97,713   

$             97,713 

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2.Financial_Statements.pdf   36

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F-36 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

16.  Income Taxes 

No provision for Federal and State income taxes was required for the years ended December 31, 2010 and 
2009,  due  to  the  Company’s  operating  losses  and  increased  deferred  tax  asset  valuation  allowance.    At 
December 31, 2010 and 2009, the Company has unused net operating loss carry-forwards of approximately 
$46,283,000  and  $36,254,000  which  expire  at  various  dates  through  2030.    Some  of  this  amount  may  be 
subject  to  annual  limitations  under  certain  provisions  of  the  Internal  Revenue  Code  related  to  “changes  in 
ownership”.   

As  of  December  31,  2010  and  2009,  the  deferred  tax  assets  related  to  the  aforementioned  carry-forwards 
have been fully offset by valuation allowances, since significant utilization of such amounts is not presently 
expected in the foreseeable future.   

Deferred tax assets and valuation allowances consist of: 

Net operating loss carry-forwards  
Valuation allowance 

2010 

2009 

$  18,050,380 
(18,050,380) 

$  14,138,900 
  (14,138,900) 

Net deferred tax assets 

$ 

- 

$ 

- 

The Company files income tax returns in the U.S. federal and Maryland state jurisdictions. The 2007 through 
2010  tax  years  are  open  and  potentially  subject  to  examination  by  the  federal  and  Maryland  state  taxing 
authorities. 

The Company was awarded a refundable tax credit of $822,137 in 2010 from the federal government through 
the  Qualified  Therapeutic  Discovery  Project  Program  enacted  from  the  Patient  Protection  and  Affordable 
Care  Act  of  2010.    The  Company  was  eligible  for  this  tax  credit  based  upon  its  expenses  for  qualified 
projects in 2009 and 2010.  Qualified projects include defined projects which treat preventable diseases and 
conditions  by  conducting  pre-clinical  activities,  clinical  trials,  or  carrying  out  research  protocols.    The  tax 
credit is reflected as a reduction to research and development expenses.  As of December 31, 2010, $676,624 
of the credit had been received by the Company.  The remaining $145,513 is included as a receivable and 
was received in January 2011. 

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F-37 

 
 
 
 
           
 
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

17.  Commitments and Contingencies 

a)  The Company has contracted with various vendors to provide research and development services. The 
terms of these agreements usually require an initial fee and monthly or periodic payments over the term 
of the agreement, ranging from 2 months to 36 months. The costs to be incurred are estimated and are 
subject  to  revision.  As  of  December  31,  2010,  the  total  estimated  cost  to  be  incurred  under  these 
agreements was approximately $17,422,893 and the Company had made payments totaling $4,353,620 
under  the  terms  of  the  agreements  as  of  December  31,  2010.    All  of  these  agreements  may  be 
terminated by either party upon appropriate notice as stipulated in the respective agreements. 

b)    The  Company  and  three  of  its  key  executives  entered  into  employment  agreements.  Each  of  these 
agreements was renewed on August 10, 2009 and expires on August 10, 2012.  The agreements result in 
annual  commitments  for  each  key  executive  of  $200,000,  $350,000  and  $250,000,  respectively.    The 
employment agreements were amended on September 9, 2010 and will expire on September 9, 2013.    

c)  On  June  22,  2009,  the  Company  entered  into  a  License  Agreement  with  Korea  Research  Institute  of 
Chemical  Technology  (“KRICT”)  to  acquire  the  rights  to  all  intellectual  properties  related  to 
Quinoxaline-Piperazine derivatives that were synthesized under a Joint Research Agreement.  The initial 
license fee was $100,000, all of which was paid by December 31, 2009.  The agreement with KRICT 
calls  for  a  one-time  milestone  payment  of  $1,000,000  within  30  days  after  the  first  achievement  of 
marketing  approval  of  the  first  commercial  product  arising  out  of  or  in  connection  with  the  use  of 
KRICT’s intellectual properties.  As of December 31, 2010, this milestone has not yet occurred.   

d)  On  June  29,  2009,  the  Company  signed  a  five  year  lease  for  5,466  square  feet  of  office  space  in 
Rockville, Maryland commencing on June 29, 2009.  The lease requires annual base rents of $76,524 
with  increases  over  the  next  five  years.  Under  the  leasing  agreement,  the  Company  pays  its  allocable 
portion of real estate taxes and common area operating charges.  Rent paid under the Company’s lease 
during the years ended December 31, 2010 and 2009 was $108,418 and $112,973, respectively.  

Future rental payments over the next four years are as follows: 

2011 
2012 
2013 
2014 

           $    148,593 
    158,835 
    162,806 
      82,408 
           $    552,642 

In connection with the lease agreement, the Company issued a letter of credit of $100,000 in favor of the 
lessor.    The  Company  has  restricted  cash  equivalents  of  the  same  amount  for  the  letter  of  credit.    On 
August  2,  2010,  the  letter  of  credit  and  was  amended  and  reduced  to  $50,000.    The  restricted  cash 
equivalent was also reduced to $50,000. 

2.Financial_Statements.pdf   38

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F-38 

 
 
 
  
  
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  
 
 
 
 
 
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

17. Commitments and Contingencies (cont’d) 

e)  On  September  21,  2009,  the  Company  closed  on  a  securities  purchase  agreement  with  Teva 
Pharmaceutical  Industries  Limited  (“Teva”),  under  which  Teva  purchased  3,102,837  shares  of  our 
common stock for $3.5 million. Contemporaneous with the execution and delivery of this agreement, the 
parties  executed  a  research  and  exclusive  license  option  agreement  (“RELO”)  pursuant  to  which  the 
Company agreed to use $2,000,000 from the gross proceeds of the issuance and sale of shares to Teva to 
fund a research and development program for the pre-clinical development of RX-3117.  At December 
31, 2010, the Company has proceeds remaining of $351,893 and has included this amount in restricted 
cash equivalents.  The Company will be eligible to receive royalties on net sales of RX-3117 worldwide.   

f)  The Company established a 401(k) plan for its employees where the Company matches 100% of the first      
3%  of  the  employee’s  deferral  plus  50%  of  an  additional  2%  of the  employee’s  deferral    The  expense 
related  to this  matching contribution aggregated $65,019 and $49,519 for the years ended December 31, 
2010 and 2009 respectively. 

g)  On June 28, 2010, the Company signed a one year renewal to use lab space commencing on July 1, 2010.  
The lease requires monthly rental payments of $4,554.  Rent paid under the Company’s lease during the 
years ended December 31, 2010 and 2009 was $54,648 and $13,662, respectively. 

18.   Fair Value Measurements 

ASC  820,  “Fair  Value  Measurements  and  Disclosure,”  (“ASC  820”)  defines  fair  value  as  the  price  that 
would  be  received  to  sell  an  asset  or  paid  to  transfer  a  liability  in  an  orderly  transaction  between  market 
participants at the measurement date, not adjusted for transaction costs. ASC 820 also establishes a fair value 
hierarchy that prioritizes the inputs to valuation techniques used to measure fair value into three broad levels 
giving the highest priority to quoted prices in active markets for identical assets or liabilities (Level 1) and 
the lowest priority to unobservable inputs (Level 3).   

The three levels are described below:  

Level 1 Inputs 

— 

Unadjusted quoted prices in active markets for identical assets or liabilities 
that is accessible by the Company; 

Level 2 Inputs 

— 

Quoted prices in markets that are not active or financial instruments for which 
all significant inputs are observable, either directly or indirectly; 

Level 3 Inputs 

— 

Unobservable inputs for the asset or liability including significant assumptions 
of the Company and other market participants. 

2.Financial_Statements.pdf   39

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F-39 

 
 
 
 
 
 
  
 
  
 
  
 
 
 
REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

18. Fair Value Measurements (cont’d) 

The following tables present our assets and liabilities that are measured at fair value on a recurring basis and 
are  categorized  using  the  fair  value  hierarchy.  The  fair  value  hierarchy  has  three  levels  based  on  the 
reliability of the inputs used to determine fair value. 

Assets: 
     Restricted cash equivalents 
     Marketable Securities 
Total Assets: 

Liabilities:  
     Warrant Liabilities 

Assets: 
     Restricted cash equivalents 
     Marketable Securities 
Total Assets: 

Liabilities:  
     Warrant liabilities 
     Put feature on common stock 
Total Liabilities:  

   Total   

Fair Value Measurements at December 31, 2010 
Level 3 
Level 2 

Level 1 

      $      401,893 
2,451,620 
$  2,853,513 

$     351,893 
2,451,620 
$  2,803,513 

$     50,000 
- 
$     50,000 

- 
- 
- 

$  2,966,710 

- 

- 

$   2,966,710 

   Total   

Fair Value Measurements at December 31, 2009 
Level 3 
Level 1 

Level 2 

      $   2,026,060 
175,000 
$  2,201,060 

$     1,925,012 
175,000 
$  2,100,012 

$     101,048 
- 
$     101,048 

- 
- 
- 

$  3,099,476 
97,713 
$  3,197,189 

- 
- 
- 

- 
    - 
- 

$   3,099,476 
97,713 
$   3,197,189 

As  of  December  31,  2010  and  2009,  the  Company’s  restricted  cash  equivalents  are  comprised  of  the 
following: 

a)  Money market funds valued at the net asset value of shares held by the Company and is classified 

within level 1 of the fair value hierarchy;  

b)  Certificate  of  deposit  valued  based  upon  the  underlying  terms  of  a  letter  of  credit,  as  discussed  in 

note 17, and classified within level 2 of the fair value hierarchy. 

Marketable securities consist of state authority and municipal security fund bonds which are valued at fair 
value and classified within level 1 of the fair value hierarchy.  

The  fair  value  methodology  for  the  warrant  liabilities  and  put  feature  on  common  stock  is  discussed  in 
footnotes 14 and 15, respectively. 

The following table sets forth a reconciliation of changes in the year ended December 31, 2010 and 2009 in 
the fair value of the liabilities classified as level 3 in the fair value hierarchy: 

2.Financial_Statements.pdf   40

2.Financial_Statements.pdf   40

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REXAHN PHARMACEUTICALS, INC. 
(A Development Stage Company) 
Notes to the Financial Statements 
December 31, 2010 and 2009 

18. Fair Value Measurements (cont’d) 

Balance at January 1, 2010  
Additions, fair value of warrants issued in 
June 2010 
Unrealized losses (gains) 
Transfers out of level 3 
Balance at December 31, 2010 

Balance at January 1, 2009  
Additions, fair value of warrants issued in 2009, 
net of inception loss of $328,937 
Unrealized gains 
Transfers out of level 3 
Balance at December 31, 2009 

Warrant 
Liabilities 
$         3,099,476   
           1,980,880   

Put Feature on 
Common Stock 

Total Level 3 
Liabilities 

$        97,713  $            3,197,189 
1,980,880   

       - 

3,823,146 
(5,936,792) 
$      2,966,710 

(97,713) 
- 
$                   - 

3,725,433 
(5,936,792) 
$         2,966,710 

Warrant 
Liabilities 

Put Feature on 
Common Stock 

Total Level 3 
Liabilities 

$         655,693    $        4,652,091  $            5,307,784 

4,236,884   
(1,793,101) 
- 
$      3,099,476 

       - 
(1,915,179) 
(2,639,199) 
$              97,713 

4,236,884   
(3,708,280) 
(2,639,199) 
$         3,197,189 

Transfers out of Level 3 for warrant liabilities consist of warrant exercises.  Transfers out of Level 3 for the put 
feature on common stock consist of dilutive issuances when the Company issued shares to investors at a lower 
price  than  the  shares  issued  to  the  investors  in  the  December  18,  2007  and  March  20,  2008  financings.    The 
Company’s  policy  is  to  recognize  transfers  in  and  transfers  out  as  of  the  actual  date  of  the  event  or  change  in 
circumstance that caused the transfer.    

19. Subsequent Event 

On  January  19,  2011,  The  Company  and  TEVA  entered  into  a  second  amendment  to  the  Securities  Purchase  
Agreement closed in September, 2009, as discussed in note 17.  Pursuant to the terms of the amendment, TEVA 
purchased  2,334,515  shares  of  the  Company’s  common  stock  in  a  private  offering  for  net  proceeds  of  $3.95 
million.  The investment by TEVA is restricted to further supporting the research and development program for 
the pre-clinical development of RX-3117.    

2.Financial_Statements.pdf   41

2.Financial_Statements.pdf   41

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F-41