AGOURON PHARMACEUTICALS INC
10-K/A, 1998-10-28
PHARMACEUTICAL PREPARATIONS
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             UNITED STATES SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                   FORM 10-K/A
                          AMENDMENT NO. 2 TO FORM 10-K
(Mark One)
   X ANNUAL REPORT  PURSUANT TO SECTION 13 OR 15(d) OF THE  SECURITIES  EXCHANGE
     ACT OF 1934

For the fiscal year ended June 30, 1998
                                                        OR
     TRANSITION  REPORT  PURSUANT  TO  SECTION  13 OR  15(d)  OF THE  SECURITIES
     EXCHANGE ACT OF 1934

Commission file number 0-15609

                          AGOURON PHARMACEUTICALS, INC.
             (Exact name of registrant as specified in its charter)


         California                                     33-0061928
  (State or other jurisdiction of          (I.R.S. Employer Identification No.)
   incorporation or organization)

10350 North Torrey Pines Road, La Jolla, California                92037-1020
   (Address of principal executive offices)                        (Zip Code)

Registrant's telephone number, including area code:              (619) 622-3000

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

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

                         Common Stock, without par value
                                (Title of class)

     Indicate  by check mark  whether the  registrant  (1) has filed all reports
required to be filed by Section 13 or 15(d) of the  Securities  Exchange  Act of
1934  during  the  preceding  12 months  (or for such  shorter  period  that the
registrant  was required to file such  reports) and (2) has been subject to such
filing requirements for the past 90 days. Yes X No

     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. [ ]

     On July 28, 1998,  the  aggregate  market value of the common stock held by
nonaffiliates  totaled  approximately  $724,738,000  based on the closing  stock
price as reported by The Nasdaq Stock Market.

     On July 28,  1998,  there were  approximately  31,097,000  shares of common
stock, without par value, of the registrant issued and outstanding.

     This  Amendment  No.  2 to the  Annual  Report  on Form  10-K  for  Agouron
Pharmaceuticals, Inc. (the "Company") for the fiscal year ended June 30, 1998 is
being filed to amend Items 7, 10, 11, 12, 13 and 14 (exhibits  10.22,  10.23 and
10.24).

                                       1
<PAGE>




                                     PART II


ITEM 7.       MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL
              CONDITION AND RESULTS OF OPERATIONS

OVERVIEW

     This discussion contains  forward-looking  statements.  Such statements are
subject to certain risks and  uncertainties  which could cause actual results to
differ  materially  from  those  projected.  See  "Important  Factors  Regarding
Forward-Looking  Statements"  attached as Exhibit 99 to this Form 10-K.  Readers
are cautioned not to place undue  reliance on these  forward-looking  statements
which speak only as of the date hereof.  The Company undertakes no obligation to
publicly release the result of any revisions to these forward-looking statements
which may be made to reflect events or circumstances after the date hereof or to
reflect the occurrence of unanticipated events.

     The Company is committed to the discovery,  development,  manufacturing and
marketing of human  pharmaceuticals  targeting  cancer,  AIDS, and other serious
diseases.  Operations  to date have been  principally  funded from the Company's
equity-derived  working capital,  various  collaborative  arrangements and, most
recently,  from the gross margin contribution of its first product,  VIRACEPT(R)
(nelfinavir mesylate). The net income reported in fiscal 1998 is principally due
to the  commercialization  of VIRACEPT  while the Company's  prior net operating
losses reflect primarily the result of its independent  research and substantial
investment in the clinical and  commercial  development  of VIRACEPT and certain
anti-cancer compounds.

     In March 1997, the Company  received  clearance from the United States Food
and Drug Administration ("FDA") to market VIRACEPT in the United States. For the
fiscal year ended June 30,  1998,  due  principally  to the  increasing  product
contribution  from  VIRACEPT  sales,  license  fees and  royalties,  the Company
realized a net income of $13,154,000.

RESULTS OF OPERATIONS

PRODUCT SALES

     Product  sales  for the  fiscal  years  ended  June 30,  1997 and 1998 were
approximately  $57,000,000 and  $409,300,000  which included sales in the United
States of $55,559,000 and $358,321,000,  respectively.  The Company  anticipates
that  VIRACEPT  sales in the United  States  will  approximate  $430,000,000  to
$440,000,000 for fiscal 1999.

CONTRACT REVENUES

     Collaborative  research and development  agreements with Japan Tobacco Inc.
("JT"), Hoffmann-La Roche Inc. and F. Hoffmann-La Roche Ltd (collectively "HLR")
accounted for  substantially  all of the Company's  contract  revenues for 1998,
1997 and 1996. Total contract
                                       2
<PAGE>


revenues  for 1998  decreased  approximately  40% from 1997 due  principally  to
decreased  VIRACEPT program  spending by Agouron,  which was partially funded by
JT.  Additionally,  the  amortization  to revenue over a 24 month period of JT's
$24,000,000 milestone payment,  which was received in August 1995, was completed
in  June  1997.  The  increase  in  contract  revenues  from  1996  to  1997  of
approximately 59% was due principally to increased program activity and spending
on the JT collaborations.

     In December 1997, the Company agreed to end its  collaboration  with HLR in
the field of  cancer.  As a result of the  termination  agreement,  Agouron  has
regained all rights to its anti-cancer  drugs previously within the scope of the
HLR collaboration.

     The  Company  anticipates  that  contract  revenues  for  fiscal  1999 will
approximate $35,000,000 to $40,000,000.

LICENSE FEES AND ROYALTIES

     The Company's license fees and royalties for 1998 and 1997 were principally
derived  from F.  Hoffmann-La  Roche Ltd  ("Roche");  license  fees in 1996 were
earned from HLR. Total revenues for 1998 increased  approximately  83% from 1997
due to European marketing  approval for VIRACEPT.  The 33% decrease from 1996 to
1997 is principally due to $9,000,000 for initial European  marketing rights for
VIRACEPT in 1997 versus  $15,000,000 for initial  world-wide  development rights
for two anti-cancer drugs in 1996.

     In January and March 1998,  VIRACEPT was  approved for  marketing in Europe
and Japan,  respectively.  Upon such approvals,  the Company realized as revenue
license  fees  totaling  $12,000,000.  In July 1997,  the Company and JT granted
Roche certain exclusive rights to VIRACEPT in several Asian countries.  For such
rights, the Company received a license fee of $2,000,000.

     Royalty revenues of  approximately  $3,852,000 have been recognized in 1998
based on estimated and actual Roche sales of VIRACEPT in its licensed territory.
The Company  anticipates  that license fees and  royalties  for fiscal 1999 will
range from $30,000,000 to $35,000,000.

COST OF PRODUCT SALES

     The  aggregate  cost of product  sales as a percentage of product sales was
approximately  43% and 42% for 1997 and 1998,  respectively.  Gross  margins  on
United States  commercial sales were  approximately  57% and 65% during 1997 and
1998, respectively.  The Company anticipates that gross margins on United States
commercial  sales will  improve as product  sales  volumes  increase and certain
manufacturing process and scale efficiencies are realized,  and will approximate
71% in 1999.  Aggregate  gross  margins will also be impacted by the size of the
Company's  patient  assistance  program  (which  provides free goods to indigent
individuals), the Company's manufacturing supply arrangement with Roche (whereby
Roche  has  the  right  to  either  purchase  product  at  Agouron's  cost  plus
contractually  determined  mark-ups or manufacture drug product for its own use,
subject to contractually determined fees to be paid to Agouron) and the level of
sales subject to Medicaid and other discounts or rebates in the United States.

                                       3
<PAGE>


RESEARCH AND DEVELOPMENT

     Research and development  ("R&D") spending  increased by approximately  39%
from 1997 to 1998 due to license fees for three  development stage HIV products,
increasing  average  R&D  staff  levels  (approximately  28%) and  staff-related
spending  (including  occupancy  and the addition of Alanex since late 1997) and
increased  expenditures for human clinical trial activities  associated with the
clinical  development  of certain of the Company's  anti-cancer  compounds.  R&D
spending  increased  by  approximately  52% from 1996 to 1997 due  generally  to
increasing  average  R&D  staff  levels  (approximately  39%) and  staff-related
expenditures  (including occupancy),  increased expenditures in support of human
clinical  trials,  an expanded  access  program  associated  with  VIRACEPT  and
increased  expenditures for clinical trial activities associated with AG3340 and
other anti-cancer compounds.  The Company anticipates that total R&D expenses in
fiscal 1999,  excluding the impact of any license fees or milestone  expenses in
either 1998 or 1999, will exceed fiscal 1998 expenses by approximately 40%.

SELLING, GENERAL AND ADMINISTRATIVE

     Selling,   general  and   administrative   ("SG&A")  expenses   represented
approximately  28% of total  operating  expenses  (excluding the cost of product
sales,  royalties and write-off of in-process technology purchased) in 1998, 23%
in 1997 and 10% in 1996. SG&A increased by  approximately  76% from 1997 to 1998
due  principally to a full year of expenses  associated with the sales force and
other marketing personnel. Spending increases from 1996 to 1997 were due chiefly
to increasing staff levels (approximately 214%) and staff-related  expenditures,
certain  premarketing  and advertising  and promotion costs  associated with the
launch of VIRACEPT in March 1997 and other costs associated with a growing sales
and marketing  infrastructure.  The Company anticipates that total SG&A expenses
will increase by  approximately  40% in fiscal 1999 due to increasing  sales and
marketing activities and the support of VIRACEPT phase IV marketing studies.

ROYALTIES

     The Company's  obligation to share VIRACEPT profits with JT is reflected in
royalty  expense  for 1998 and  represents  approximately  19% of United  States
product sales. Royalties in fiscal 1997 were not significant.  It is anticipated
that  royalty  expense  for fiscal  1999 will  approximate  24% to 25% of United
States product sales.

WRITE-OFF OF IN-PROCESS TECHNOLOGY PURCHASED

     In fiscal 1997,  the Company  acquired  Alanex  Corporation  ("Alanex"),  a
research  company  engaged in the discovery of drug leads through the high-speed
screening of diverse chemical  libraries  designed by computational  methods and
generated  by  combinatorial  chemistry.  Alanex  was  acquired  in  a  purchase
transaction  through the issuance of  approximately  2,000,000 shares of Agouron
common  stock  valued  at  approximately  $61,000,000.  Transaction  costs  were
approximately  $1,300,000.  In fiscal 1997, the Company  recorded a write-off of
$57,500,000  (or  92% of  the  purchase  price,  including  transaction  costs),
representing  the values  determined  by management  to be  attributable  to the
in-process  technology purchased.  Of the amount written off,  approximately 95%
was attributed to and supported by a discounted cash flow analysis of
                                       4
<PAGE>


 three drug discovery  programs which  anticipated  revenues  beginning in 2003.
Approximately  40% of the value was  attributed  to a compound  with obesity and
cardiovascular  indications,  30% for  compounds  with  depression  and  anxiety
indications  and  25% for a  program  to  treat  endometriosis  and  sex-hormone
dependent  tumors.   The  Company  believes  that  the  values  and  allocations
attributable  to these  programs are  reasonable  and  appropriate  based on the
commercial  potential  of these  three drug  discovery  programs.  Further,  the
Company  believes that there is no persuasive  evidence that the aggregate value
attributed to the three programs has been diminished since the acquisition.  The
Company  recorded  $4,800,000 of the purchase  price as an asset,  attributed to
Alanex's technology and chemical compound library, which is being amortized over
the  expected  benefit  periods.  At  June  30,  1998,  the  asset  balance  was
approximately $3,500,000.

INTEREST AND OTHER INCOME

     Interest  income  increased  by 1%  from  1997  to  1998.  Interest  income
increased by  approximately  23% from 1996 to 1997 due  principally  to a higher
average  investment  portfolio  balance  resulting  from  the July  1996  public
offering, receipt of $15,000,000 and $9,000,000,  respectively,  in license fees
from HLR (June 1996) and Roche (January 1997),  significantly increased contract
funding from JT and HLR and the exercise of employee stock options.  The Company
anticipates that, absent additional  revenue sources or a significant  change in
interest  rates,  fiscal 1999  interest  income will be less than that of fiscal
1998.

INTEREST EXPENSE

     Interest expense increased in 1998 from 1997 due to borrowings under a line
of credit  which  was used to  partially  fund  quarterly  royalties  paid to JT
throughout  the  year.   Interest  expense   decreased  in  1997  from  1996  by
approximately  38%  due  to  a  decreasing  level  of  debt  and  capital  lease
obligations from year to year.

INCOME TAX PROVISION (BENEFIT)

     The income tax  provision  in 1998 has been  computed  using an  effective,
combined  federal  and  state  rate of 40%.  The cash  obligation  of such  1998
provision has been mostly offset by the  utilization of its deferred tax assets.
Based on its 1998 pre-tax  profit and its estimates for future  taxable  income,
the Company  believes it is more  likely than not that its  deferred  tax assets
(comprised mostly of net operating loss carryforwards,  deductions  generated by
the exercise of stock options,  and research  credits) will be realized and has,
therefore,  recorded  the full tax  benefit  of its  deferred  tax  assets.  The
Company's accumulated net deferred tax assets totaled approximately  $55,900,000
and  $64,100,000  at June 30, 1997 and 1998.  The Company  anticipates  that its
effective  income  tax rate for fiscal  1999 will  range  from 10% to 15%.  Such
decrease from fiscal 1998 is attributed to greater expected  availability of R&D
tax credits due to the anticipated  increase in R&D spending and the anticipated
reduction in R&D contract revenues.

                                       5
<PAGE>


YEAR 2000

     The Year 2000 issue  results from  computer  programs and systems that were
created  to  accept  only  two  digit  dates.  Such  systems  may not be able to
distinguish  20th century  dates from 21st century  dates.  This could result in
miscalculations  and system  failures.  The Company has  established a Year 2000
project  team  that  is  currently   reviewing  computer  systems  and  computer
controlled  equipment that could be affected by this issue. In this process, the
Company  expects to both  replace and  upgrade  certain  systems and  equipment.
Additionally, the Company is in the process of contacting all of its significant
external  business  partners  to  determine  the extent to which the  Company is
vulnerable to their failure to obtain Year 2000 compliance. While the total cost
of  obtaining  Year 2000  compliance  is not  known at this  time,  the  Company
believes such cost will not have a material  effect on the  Company's  business,
financial position,  or results of operation.  However,  even though the Company
plans  to have  obtained  Year  2000  compliance  prior to the  year  2000,  the
inability of the Company or its  business  partners to  adequately  address year
2000 issues could have a significant impact on the Company's business.

LIQUIDITY AND CAPITAL RESOURCES

     Prior to fiscal 1998, the Company relied  principally on equity  financings
and corporate collaborations to fund its operations and capital expenditures. In
fiscal 1998,  due  primarily to the  successful  commercialization  of VIRACEPT,
operating  activities  have  provided  $827,000  of  cash  compared  with  using
$73,467,000  in fiscal  1997.  Commercial  sales of  VIRACEPT  for 1997 and 1998
resulted in gross margins of approximately $32,370,000 and $236,654,000.

     At June 30,  1998,  the Company had net  working  capital of  approximately
$127,728,000,  an  increase  of  $11,942,000  over  June  30,  1997  levels  due
principally to the Company's pre-tax profit of $21,924,000.  Individual  working
capital components  significantly  impacted by the commercialization of VIRACEPT
include trade accounts receivable (an increase of $18,416,000),  inventories (an
increase of  $44,906,000),  accounts  payable (an increase of  $15,560,000)  and
accrued  liabilities  (an  increase  of  $26,467,000,  primarily  due to accrued
royalties  payable  to  JT).  It  is  anticipated  that  these  working  capital
components and cash and short-term investments will continue to be significantly
impacted as VIRACEPT  sales  increase.  At June 30, 1998,  the Company had cash,
cash equivalents and short-term  investments of approximately  $87,123,000.  The
Company  believes  that its  current  capital  resources,  existing  contractual
commitments and anticipated  VIRACEPT product sales  contribution are sufficient
to maintain its current  operations through fiscal 1999. This belief is based on
current research and clinical  development  plans,  anticipated  working capital
requirements  associated with the expanding  commercialization of VIRACEPT,  the
current  regulatory   environment,   historical   industry   experience  in  the
development of therapeutic drugs and general economic conditions.

     The Company believes that additional  financing may be required to meet the
planned operating needs after fiscal 1999 if significant and increasing positive
cash flows are not  generated  from  commercial  activities.  Such  needs  would
include the expenditure of substantial funds to continue and expand research and
development  activities,  conduct existing and planned  preclinical  studies and
human clinical trials and to support the increasing working capital requirements
of a  growing  commercial  infrastructure  including  manufacturing,  sales  and
marketing  capabilities.  As a result, the Company anticipates  pursuing various
financing alternatives such as collaborative  arrangements and additional public
offerings or private
                                       6
<PAGE>


 placements of securities.  If such alternatives are not available,  the Company
may be required to defer or restrict  certain  commercial  activities,  delay or
eliminate  expenditures for certain of its potential products under development,
cancel licenses from third parties or to license third parties to  commercialize
products or  technologies  that the Company would  otherwise  seek to develop or
commercialize itself.

     During fiscal 1998, capital  expenditures totaled $33,086,000 compared with
$14,727,000 and $3,710,000 during 1997 and 1996, of which $1,579,000, $2,355,000
and $457,000  were financed  through  capital  lease  obligations.  Of the total
capital  expenditures  during 1998,  1997 and 1996,  approximately  $14,331,000,
$4,728,000 and $318,000 represented  leasehold improvement costs associated with
certain  of the  Company's  facilities.  With  the  exception  of the  leasehold
improvement costs,  virtually all of the capital  expenditures during 1998, 1997
and  1996   represented   laboratory   and  office   equipment  and   scientific
instrumentation  necessary to support an expanding  research,  development,  and
commercial  infrastructure.  Capital expenditures during 1999 are expected to be
approximately  $18,000,000  to  support  continued  product   commercialization,
development and research activities.  Of the total expected capital expenditures
during  1999,   approximately   $4,000,000  is  associated  with  the  leasehold
improvement  of existing  and  anticipated  new  administrative  and  laboratory
facilities.  The  Company  may  utilize  lease  or debt  financing  for  certain
expenditures if available on acceptable terms.

                                       7
<PAGE>


                                    PART III

ITEM 10.      DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

     The executive officers and directors of the Company are as follows:
<TABLE>
<CAPTION>

 
                  NAME                          AGE                        POSITION
                  ----                          ---                        --------
           <S>                                  <C>           <C>   
           Peter Johnson                         53           President, Chief Executive Officer and Director

           Marvin R. Brown, M.D.                 51           Vice President, and President of Alanex

           Neil J. Clendeninn, M.D., Ph.D.       49           Corporate Vice President, Head of Clinical Affairs

           Steven S. Cowell                      49           Corporate Vice President, Finance and Chief
                                                                Financial Officer

           William C. Denby                      43           Vice President, Head of Marketing and Sales

           Gary E. Friedman                      51           Corporate Vice President, General Counsel,
                                                              Secretary and Director

           Donna C. Nichols                      41           Vice President, Head of Corporate Communications

           Barry D. Quart, Pharm.D.              41           Senior Vice President, Head of Drug Development

           R. Kent Snyder                        44           Senior Vice President, Head of Commercial Affairs

           Michael D. Varney, Ph.D.              40           Vice President, Head of Research

           Stephanie Webber, Ph.D.               50           Vice President, Head of Development Pharmacology

           Glenn R. Zinser                       56           Corporate Vice President, Head of Operations

           John N. Abelson, Ph.D.(1)             59           Director

           Patricia M. Cloherty(2)               56           Director

           A.E. Cohen(1)                         62           Director

           Michael E. Herman(1)                  57           Director

           Irving S. Johnson, Ph.D.              73           Director

           Antonie T. Knoppers, M.D.(2)          83           Director

           Melvin I. Simon, Ph.D.(2)             61           Director


</TABLE>
- ------------------------------
(1)  Member of Directors Compensation Committee
(2)  Member of Audit Committee

                                       8
<PAGE>


     PETER  JOHNSON,  a founder of the Company,  has served as a director and as
president  and chief  executive  officer of the Company  since its  inception in
1984.  Through  1989,  Mr.  Johnson  held  various  positions  with The  Agouron
Institute,  including executive  director.  Mr. Johnson received a M.A. from the
University of California, San Diego.

     MARVIN R. BROWN joined the Company in 1997 as vice president, and president
of Alanex.  In 1991,  Dr. Brown founded  Alanex and, from 1993 until joining the
Company, served as president,  chief executive officer and chairman of the board
of Alanex.  Prior to joining  Alanex,  Dr. Brown served as professor of medicine
and surgery and director of the peptide biology  laboratory at the University of
California,  San Diego from 1986 through 1991 and was on the faculty of the Salk
Institute for Biological  Studies from 1975 to 1986. Dr. Brown received his M.D.
from the University of Arizona.

     NEIL J. CLENDENINN  joined the Company in 1993 as vice president,  clinical
affairs. In 1997, Dr. Clendeninn was promoted to corporate vice president,  head
of clinical  affairs.  From 1985 until joining the Company,  Dr. Clendeninn held
various   positions  with  Burroughs   Wellcome  Co.,   including  head  of  the
chemotherapy  section from 1988. From 1981 through 1985, Dr.  Clendeninn  worked
with the  clinical  oncology and  clinical  pharmacology  groups at the National
Institutes of Health. Dr. Clendeninn received a M.D. and a Ph.D. in pharmacology
from New York University.

     STEVEN S. COWELL joined the Company in 1991 as vice president,  finance and
chief  financial  officer.  In 1997,  Mr. Cowell was promoted to corporate  vice
president.  From 1982  until  joining  the  Company,  Mr.  Cowell  held  various
positions,  the most recent of which was vice  president and controller at Cetus
Corporation,   a  public   biotechnology   company   primarily  engaged  in  the
development, manufacture and marketing of pharmaceutical products. Mr. Cowell is
a Certified  Public  Accountant  in  California  and received a B.S. in business
administration from the University of California, Berkeley.

     WILLIAM  C.  DENBY  joined  the  Company in 1995 and in 1997 was named vice
president,  head of marketing and sales. Previously,  Mr. Denby served as senior
director of marketing and sales. From 1978 until joining the Company,  Mr. Denby
held  various  positions  at  Marion  Laboratories,  Inc.  (now  Hoechst  Marion
Roussel),  including  strategic  planning  manager  and managed  care  marketing
manager.  Mr. Denby received a B.A. in English from the State  University of New
York, and holds a M.B.A. in Finance from Rockhurst College.

     DONNA C.  NICHOLS  joined  the  Company  in 1987 and in 1997 was named vice
president,  head of  corporate  communications.  Previously,  Ms.  Nichols  held
various  positions  within  the  Company,  most  recently  as  senior  director,
corporate communications. Ms. Nichols attended Kent State University.

     GARY E. FRIEDMAN,  a founder of the Company, has served as a director since
its inception,  as the secretary of the Company since 1986 and as vice president
and general  counsel since 1991. In 1997, Mr. Friedman was promoted to corporate
vice president.  Previously,  from 1982 until joining the Company,  Mr. Friedman
was a  principal  of the law firm of  Friedman,  Jay &  Cramer,  a  Professional
Corporation. Mr. Friedman is a California Certified Specialist in Taxation. Mr.
                                       9
<PAGE>


Friedman  received  a J.D.  and a M.B.A.  from  the  University  of  California,
Berkeley and a L.L.M. in taxation from the University of San Diego.

     BARRY D. QUART  joined the  Company in 1993 as vice  president,  regulatory
affairs.  In 1997,  Mr. Quart was named to senior vice  president,  head of drug
development.  From 1983 until  joining  the  Company,  Dr.  Quart  held  various
positions with  Bristol-Myers  Squibb Company,  including  executive director of
international  regulatory  affairs from 1992. Dr. Quart  received a Pharm.D.  in
clinical pharmacy from the University of California, San Francisco.

     R. KENT  SNYDER  joined  the  Company in 1991 as vice  president,  business
development.  In  1995,  Mr.  Snyder's  title  was  changed  to vice  president,
commercial  affairs and in 1997, he was named senior vice  president,  corporate
affairs.  From 1982 until joining the Company, Mr. Snyder held various positions
with Marion Laboratories,  Inc. (now Hoechst Marion Roussel), including director
of  U.S./European  licensing.  Prior to his  employment at Marion,  from 1978 to
1982, he held various sales and marketing positions with Hoffmann-LaRoche Ltd.
Mr. Snyder received a M.B.A. from Rockhurst College.

     MICHAEL D. VARNEY  joined the  Company in 1987 and in 1997 was  promoted to
vice president,  head of research.  A synthetic organic chemist,  Dr. Varney has
been  involved  in all  aspects  of drug  discovery  at the  Company  since  its
inception.  Dr.  Varney  received his B.S. in Chemistry  from UCLA and Ph.D.  in
Natural Product  Synthesis from the California  Institute of Technology.  Before
joining the Company, he completed  postdoctoral research in Bioorganic Chemistry
at Columbia University.

     STEPHANIE  WEBBER  joined the  Company in 1988 and in 1997 was  promoted to
vice president, head of development pharmacology.  Previously, Dr. Webber served
as senior director,  pharmacology and toxicology.  From 1980 to 1988, Dr. Webber
was a  research  fellow at the  Scripps  Clinic  and  Research  Foundation.  She
received her B.S. in Biology from the University of Sussex, England, and holds a
Ph.D. in Zoology from the University of London.

     GLENN R. ZINSER joined the Company in 1987 and,  since 1995,  has served as
vice president,  operations.  In 1997, Mr. Zinser was promoted to corporate vice
president,  head of operations.  Previously,  from 1987 through 1995, Mr. Zinser
held various management  positions with the Company,  including senior director,
operations  from 1993  through  1995.  Mr.  Zinser  received  a M.B.A.  from the
University of California, Los Angeles.

     JOHN N. ABELSON,  a founder of the Company,  has served as a director since
its inception.  Dr. Abelson, a molecular biologist,  is a member of the National
Academy of Sciences. Since 1982, Dr. Abelson has been a member of the faculty of
the Division of Biology at the California  Institute of Technology  where,  from
1989 until 1995, he served as chairman.  Previously, Dr. Abelson was a member of
the faculty in the Department of Chemistry at the University of California,  San
Diego.  Dr.  Abelson  received  a Ph.D.  in  biophysics  from The Johns  Hopkins
University and was a postdoctoral  fellow at the Laboratory of Molecular Biology
in  Cambridge,  England.  Dr.  Abelson  also serves as a director of The Agouron
Institute.


                                       10
<PAGE>


     PATRICIA M. CLOHERTY joined the Board in 1988. Since 1970, Ms. Cloherty has
been  associated  with Patricof & Co.  Ventures,  Inc.  (formerly  Alan Patricof
Associates, Inc.), a New York venture capital firm ("Patricof"),  and has been a
general partner of its funds since 1973.  From1993 until 1997, she was president
of  Patricof.  From  1997  to the  present,  Ms.  Cloherty  has  been  executive
co-chairman as well as general partner of Patricof.  Ms. Cloherty also served as
deputy  administrator  for the U.S.  Small Business  Administration  in 1977 and
1978.  Ms.  Cloherty  also serves on the board of directors  of several  private
companies.

     A.E. COHEN joined the Board in 1992. Mr. Cohen is an independent management
consultant.  From 1957 until his  retirement  in 1992,  Mr.  Cohen held  various
positions at Merck & Co., Inc., including senior vice president and president of
the Merck Sharp & Dohme  International  Division.  Currently,  Mr.  Cohen is the
chairman of the board of Neurobiological  Technologies,  Inc. and is a member of
the board of directors of Akzo Nobel N.v., Teva Pharmaceutical  Industries Ltd.,
Smith Barney (Mutual Funds), and Pharmaceutical  Product Development,  Inc., all
of which are public  companies.  Mr.  Cohen also serves as a  consultant  to The
Population  Council and Chugai  Pharmaceutical  Co. Ltd., Tokyo ("Chugai"),  and
serves as chairman of the board of Chugai's U.S. subsidiary companies. Mr. Cohen
also is a member of the board of directors of Lung Check, Inc.

     MICHAEL  E.  HERMAN  joined  the  Board in 1992.  Mr.  Herman  is a private
investor,  as well as president and chief  operating  officer of the Kansas City
Royals  Baseball  Team.  From 1974 until his retirement in 1990, Mr. Herman held
various  positions at Marion  Laboratories,  Inc. (now Hoechst Marion  Roussel),
including executive vice president and chief financial officer.  Currently,  Mr.
Herman serves as chairman of the finance  committee of the Ewing Marion Kauffman
Foundation, a private foundation located in Kansas City, where from 1985 through
1990,  he was the president and chief  operating  officer.  Mr. Herman is also a
member of the board of directors of Cerner Corporation, Seafield Capital and SLH
Corporation,  all of which  are  public  companies,  and  serves on the board of
directors of several private companies.

     IRVING S. JOHNSON  joined the Board in 1989.  Dr. Johnson is an independent
consultant in biomedical research working with numerous private companies.  From
1953 until his  retirement in 1988,  Dr.  Johnson held various  positions at Eli
Lilly and Company,  including  vice  president of research from 1973 until 1988.
Dr.  Johnson  also  served on  several  committees  of the  National  Academy of
Sciences,  the Office of Technology  Assessment  and the National  Institutes of
Health.  Currently,  he is a  member  of  the  board  of  directors  of  Allelix
Biopharmaceuticals Inc. and Ligand Pharmaceuticals  Incorporated,  and is on the
scientific  advisory  board  of  ELAN  Corporation,  all  of  which  are  public
companies.  Dr.  Johnson  received a Ph.D.  in  developmental  biology  from the
University of Kansas.

     ANTONIE  T.  KNOPPERS  joined  the  Board  in  1991.  Dr.  Knoppers  is  an
independent management  consultant.  From 1952 until his retirement in 1975, Dr.
Knoppers held various positions at Merck & Co., Inc., including vice chairman of
the board and president and chief operating officer. Dr. Knoppers is a member of
the board of directors of Centocor,  Inc., a public  biotechnology  company.  In
addition,  he is a former  chairman  of the U.S.  Council  of the  International
Chamber  of  Commerce  and  a  member  of  the  advisory  board  of  PaineWebber
Development Corporation, an affiliate of PaineWebber Incorporated.  Dr. Knoppers
received a
                                       11
<PAGE>


M.D. from the University of Amsterdam and a Ph.D. from the University of Leiden,
The Netherlands.

     MELVIN I. SIMON,  a founder of the Company,  has served as a director since
its inception.  Dr. Simon, a molecular  geneticist,  is a member of the National
Academy of Sciences. Currently, Dr. Simon is chairman of the Division of Biology
at the  California  Institute  of  Technology  where he has been a member of the
faculty  since 1982.  Previously,  Dr.  Simon was a member of the faculty in the
Department of Biology at the  University  of  California,  San Diego.  Dr. Simon
received a Ph.D. in biochemistry from Brandeis University. Dr. Simon also serves
as a director of The Agouron Institute.

SECTION 16(A) BENEFICIAL OWNERSHIP REPORTING REQUIREMENTS

     Section 16(a) of the Exchange Act requires the Company's executive officers
and  directors,  and persons who own more than 10% of a registered  class of the
Company's  equity  securities,  to file  reports  of  ownership  and  changes in
ownership with the Commission and The Nasdaq Stock Market.  Executive  officers,
directors  and  greater  than  10%   shareholders  are  required  by  Commission
regulation  to furnish the Company  with copies of all Section  16(a) forms they
file.  Based  solely on review of the  copies  of such  forms  furnished  to the
Company, or written  representations that no Forms 5 were required,  the Company
believes that, during the applicable  reporting period ending June 30, 1998, all
Section  16(a)  filing  requirements   applicable  to  its  executive  officers,
directors and greater than 10% beneficial owners were satisfied.

ITEM 11.      EXECUTIVE COMPENSATION

COMPENSATION OF DIRECTORS

    Non-employee members of the Board receive cash compensation in the amount of
$250 per Board meeting for their services as Board members, and are eligible for
reimbursement  of their  expenses  incurred  to  attend  each  such  meeting  in
accordance   with  Company  policy.   In  addition  to  meeting  fees,   certain
non-employee   directors  received  consulting  fees  during  fiscal  1998.  For
scientific consultation, Dr. Abelson received $30,040; Dr. Knoppers, $6,000; Dr.
Johnson,  $18,750 and Dr. Simon,  $26,900. For special  consultation  concerning
corporate development issues, Mr. Cohen received $18,250 and Mr. Herman received
$750.


                                       12
<PAGE>


COMPENSATION OF EXECUTIVE OFFICERS

     The following table sets forth the aggregate  compensation  paid or accrued
by the Company to the Chief Executive  Officer and to the four other most highly
compensated  executive officers whose annual compensation  exceeded $100,000 for
the  fiscal  year  ended  June  30,  1998  (collectively  the  "named  executive
officers")  for service  during the fiscal years ended June 30,  1998,  1997 and
1996:

                                            SUMMARY COMPENSATION TABLE
<TABLE>
<CAPTION>

                                                                                    Long-Term
                                                                                  Compensation
                                              Annual Compensation                    Awards(2)
        Name                                  -------------------                    ------
     Principal                                                                        Stock             All Other
     Position                     Year        Salary(1)         Bonus                Options          Compensation(3)
     --------                     ----        ------            -----                -------          ------------

<S>                              <C>        <C>              <C>                      <C>               <C>    
Peter Johnson                    1998       $ 395,000        $ 230,000                40,000            $ 2,998
President and Chief              1997         330,000          165,000               100,000              2,250
Executive Officer                1996         285,000          100,000               180,000              1,647

Marvin R. Brown(4)               1998         230,000           65,000                10,000              2,400
Vice President,                  1997          23,523                0                     0                  0
President of Alanex              1996              --               --                    --                 --                     
Gary E. Friedman                 1998         212,500          100,000                17,000             11,232
Corporate Vice President,        1997         195,000           70,000                26,000              2,250
General Counsel                  1996         175,500           50,000                50,000              1,589

Barry D. Quart(5)                1998         230,000          125,000                21,000              2,713
Senior Vice President,           1997         180,000          115,500(5)             44,000              2,953
Regulatory Affairs               1996         165,000           70,500(5)             72,000             16,587

R. Kent Snyder(5)                1998         230,000          150,000                21,000              3,050
Senior Vice President,           1997         200,000          102,000(5)             44,000              2,250
Commercial Affairs               1996         178,500           62,200(5)             64,000              1,777
</TABLE>

- ---------------------
(1) Includes  amounts  deferred out of  compensation under the Company's 401(k)
    Plan  otherwise  payable in cash during each fiscal year.
(2) The Company has made no restricted stock awards,  has not granted any stock
    appreciation rights and has no other long-term incentive plans.
(3)  (a) During  1998,  the  Company  made  matching  contributions  to the
         Company's 401(k) Plan in the following  amounts:  Mr. Johnson,  $2,998;
         Dr. Brown,  $2,400; Mr. Friedman,  $3,063;  Dr. Quart,  $2,713; and Mr.
         Snyder $3,050.
     (b) During  1997, the Company made matching contributions to the Company's
         401(k) Plan in the following amounts: Mr. Johnson, $2,250; Mr. Friedman
         $2,250; Dr. Quart, $2,953; and Mr. Snyder, $2,250.
     (c) During 1996, the Company made matching  contributions  to the Company's
         401(k)  Plan  in  the  following  amounts:  Mr.  Johnson,  $1,647;  Mr.
         Friedman, $1,589; Dr. Quart, $1,959; and Mr. Snyder, $1,777.
     (d) During 1996, the Company  reimbursed Dr. Quart for relocation  costs in
         the amount of $14,628.  
     (e) During 1998,  Mr.  Friedman  sold accrued but unused vacation  back to
         the Company in the amount of $8,169.
(4) Dr. Brown joined the Company  in May 1997 with the  acquisition  of Alanex 
    Corporation.  
(5) For Dr. Quart and Mr. Snyder, a portion of the bonus amount was subsequently
    used to partially repay their outstanding relocation loans. These loans were
    paid in full on June 30, 1997.

                                       13
<PAGE>



     The  following  table  sets  forth  certain  information  with  respect  to
individual  grants of stock  options  made during the fiscal year ended June 30,
1998, to each of the named executive officers:

                                           OPTION GRANTS IN FISCAL 1998
<TABLE>
<CAPTION>

                                                                                     Potential Realizable Value at
                                                                                       Assumed Annual Rates of
                                                                                       Stock Price Appreciation
                            Individual Grants                                              for Option Term(2)
- ---------------------------------------------------------------------------------    -----------------------------   
                                            % of Total
                                              Options
                                            Granted to
                                             Employees
                                 Options     in Fiscal     Exercise    Expiration
    Name                        Granted(1)     Year         Price        Date             5%                10% 
- ------------                   ------------  ----------   ---------  -----------     -----------      -----------

<S>                            <C>             <C>        <C>            <C>             <C>          <C>       
Peter Johnson                  30,145#         2.70%      $30.4375       6/29/08         $577,035     $1,462,320
                                9,855*         0.88        30.4375       6/29/08          188,644        478,061



Marvin R. Brown                   145#         0.01        30.4375       6/29/08            2,776          7,034
                                9,855*         0.88        30.4375       6/29/08          188,644        478,061



Gary E. Friedman                7,145#         0.64        30.4375       6/29/08          136,769        346,601
                                9,855*         0.88        30.4375       6/29/08          188,644        478,061



Barry D. Quart                 11,145#         1.00        30.4375       6/29/08          213,337        540,639
                                9,855*         0.88        30.4375       6/29/08          188,644        478,061


R. Kent Snyder                 11,145#         1.00        30.4375       6/29/08          213,337        540,639
                                9,855*         0.88        30.4375       6/29/08          188,644        478,061
</TABLE>

- ------------------------
(1)  During  fiscal 1998,  the Agouron  Stock Option Plan ("Plan") for executive
     officers and directors was administered by the Board. The Board, based upon
     the recommendation of the Directors Compensation Committee,  determines the
     number  of  shares  to be  granted  and the  term of  such  grants  to each
     executive  officer and  director.  The options  granted in fiscal 1998 were
     either incentive stock options(*) or non-statutory  stock options(#),  have
     exercise prices equal to the fair market values on the date of grant,  vest
     over a period of three  years and have a term of ten  years.  Upon  certain
     corporate  events  as  defined  in the Plan  which  result  in a change  of
     control,  the exercise date of all  outstanding  options for all employees,
     including executive officers, may be accelerated. The Plan also permits the
     Company to assist an  employee  in using a  so-called  "cashless"  exercise
     procedure to pay the option exercise price.
(2)  Potential  realizable  value is based on an assumption that the stock price
     of the  Common  Stock  appreciates  at the annual  rate  shown  (compounded
     annually) from the date of grant until the end of the ten year option term.
     These numbers are calculated based on the  requirements  promulgated by the
     Securities  and  Exchange  Commission  and do  not  reflect  the  Company's
     estimate of future stock price  growth.  Any such growth would  benefit all
     shareholders.

                                       14
<PAGE>



     The  following  table sets forth certain  information  with respect to each
exercise of stock options during the fiscal year ended June 30, 1998, by each of
the named  executive  officers and the number and value of  unexercised  options
held by such named executive officers as of June 30, 1998:

                                          OPTION EXERCISES IN FISCAL 1998
                                       AND VALUE OF OPTIONS AT JUNE 30, 1998
<TABLE>
<CAPTION>

                                                             Number of Unexercised          Value of Unexercised
                                                                  Options at              In-the-Money Options at
                           Shares                              June 30, 1998(2)              June 30, 1998(1)      
                                                          --------------------------    ---------------------------
                         Acquired on         Value
      Name                 Exercise        Realized       Exercisable  Unexercisable     Exercisable  Unexercisable
    --------               --------        --------       -----------  -------------     -----------  -------------

<S>                       <C>            <C>               <C>           <C>           <C>             <C>        
Peter Johnson             125,000        $5,692,095        596,923       205,767       $ 11,290,804    $ 1,312,900

Marvin R. Brown             2,500            85,744         17,845        17,325            538,428        221,014

Gary E. Friedman            1,000            24,188        241,599        61,001          4,988,364        348,337

Barry D. Quart             32,000         1,233,037        133,266        89,334          1,982,900        513,000

R. Kent Snyder             12,500           406,045        168,932        81,668          2,983,727        392,673

</TABLE>

- ---------------------
(1)  Value  calculated as market value of Company stock on June 30, 1998,  minus
     exercise  price  multiplied by the number of shares

(2)  Adjusted  to reflect  the  two-for-one  stock  split in the form of a stock
     dividend in August 1997.


                                       15
<PAGE>


COMPENSATION COMMITTEE REPORT ON EXECUTIVE COMPENSATION(1)

OVERVIEW AND PHILOSOPHY

     The Directors Compensation Committee (the "Committee") is composed entirely
of  outside   directors   and  is   responsible   for   developing   and  making
recommendations   to  the  Board  with  respect  to  the   Company's   executive
compensation  policies and practices,  including the establishment of the annual
total compensation for the chief executive officer (the "CEO") and all executive
officers.  The Committee has available to it an outside compensation  consultant
and  access to  independent  compensation  data.  The Board is  responsible  for
approving and implementing the  compensation  recommendations  of the Committee.
The  recommendations  made by the  Committee  to the Board have  generally  been
approved without any significant modification.

     The  objectives  of the  Company's  executive  compensation  program are to
attract,  retain  and  motivate  highly  qualified  executive  personnel.  These
objectives  are  satisfied  through  the  use of  three  principal  compensation
elements: base salary, cash bonus payments and stock options.

BASE SALARY

     Base salary  levels for the Company's  executive  officers are based on the
concept  of pay  for  performance  and are  competitively  set  relative  to the
compensation of other executives in the biotechnology industry. Extensive salary
survey data is  available on the industry  (notably,  the annual  "Biotechnology
Compensation and Benefits Survey" conducted by Radford  Associates and Alexander
& Alexander  Consulting  Group) and is utilized by the Committee in establishing
annual base salaries. In determining base salaries, the Committee also considers
corporate  performance  and progress in the immediately  preceding  fiscal year,
individual experience and performance, specific issues which are relevant to the
Company  and  general  economic  conditions.  The base salary of the CEO and all
other executive officers is reviewed annually. During fiscal year 1998, the base
salaries paid to the executive officers other than the CEO approximated the 75th
percentile of the above-noted industry survey data.

BONUS PAYMENTS

     Annual cash bonus payments are  discretionary.  Bonus payments,  if any, to
executive  officers,  including  the CEO,  are based on two  principal  factors:
corporate  performance as compared to the Company's  annual goals and objectives
and  individual  performance  relative to corporate  performance  and individual
goals and objectives.

     Bonus payments in 1998 were generally in recognition of the satisfaction of
several  significant   corporate  objectives  during  the  year,  including  the
establishment of the Company's first product,  VIRACEPT(R) (nelfinavir mesylate)
as the market leader among all HIV protease

- ------------------------
(1) The material in this report is not soliciting material, is not deemed filed
with the SEC, and is not incorporated by reference in any filing of the Company
under the Securities Act of 1933 (the "Securities Act"), as amended, or the
Securities Exchange Act of 1934 (the "Exchange Act"), as amended, whether made
before or after the date of the Proxy Statement and irrespective af any general
incorporation language in such filing.
                                       16
<PAGE>


 inhibitors, the in-licensing of three development stage compounds to supplement
the Company's  internal R&D pipeline,  the  continued  preclinical  and clinical
development of the Company's  cancer and anti-viral  agents and the satisfaction
of all significant financial targets for fiscal 1998.

     Bonus payment recommendations for executive officers other than the CEO are
initiated by the CEO and submitted to the  Committee  for review and  subsequent
submission to the Board. Bonus payment recommendations for the CEO are initiated
by the Committee and submitted to the Board.

     Total  base  salary  and  any  bonus   payments   are  compared  to  "total
compensation" of peers as reported by the previously noted industry survey. Such
total  compensation for the executive officers of the Company is at or above the
averages of such data,  which reflects the Committee's  belief that the relative
levels of corporate performance during the period were also above average.

STOCK OPTIONS

     To conserve its cash  resources,  the Company  places  special  emphasis on
equity-based  incentives to attract,  retain and motivate  executive officers as
well as other  employees.  Under the Company's  stock option  plans,  grants are
generally  priced at the fair  market  value on the date of  grant,  vest over a
period of three or four years and have a term of ten  years.  Grants are made to
all  employees  on their date of hire based on salary  level and  position.  All
employees,   including   executive   officers,   are  eligible  for  subsequent,
discretionary grants which are generally based on either individual or corporate
performance.  It is the  Committee's  intent that the interests of the Company's
shareholders  and the executive  officers be closely  aligned through the use of
stock options.  Option grants  recommended by the Committee are submitted to the
Board for  approval.  Based on recent  peer-company  proxy data  compiled by the
Company,  the level of option grants to each  executive  officer in 1998 remains
competitive,  and the  resultant  total  option  position  as a percent of total
shares outstanding represents  approximately the 70th to 90th percentile of such
positions.

CHIEF EXECUTIVE OFFICER COMPENSATION

     During 1998, Mr.  Johnson's base salary of $395,000 was based on individual
and corporate performance,  and approximated the average of the updated industry
data for base salaries of CEOs.

     During 1998,  Mr. Johnson was awarded a bonus of $230,000 in recognition of
the  satisfaction of several  significant  corporate  objectives,  including the
establishment  of  VIRACEPT(R)  as the number one HIV protease  inhibitor in the
United States with product sales in the United States of $358 million for fiscal
1998.   The  Committee   believes  that  Mr.  Johnson  has  made  a  significant
contribution during 1998 in enhancing shareholder value and establishing a sound
base for the continued  enhancement of shareholder  value through his managerial
and entrepreneurial efforts.

                                       17
<PAGE>



     The stock options awarded to Mr. Johnson during fiscal 1998 are competitive
and consistent  with the purpose of the stock option plans.  The resultant total
option   position  as  a  percent  of  total   shares   outstanding   represents
approximately the 75th percentile for peer CEO positions.

EXECUTIVE COMPENSATION DEDUCTION LIMITATIONS

     In 1993, Section 162(m) of the Internal Revenue Code ("Section 162(m)") was
enacted which  disallows the  deductibility  by the Company of any  compensation
over $1 million  per year paid to each of the chief  executive  officer  and the
four  other  most  highly  compensated   executive   officers,   unless  certain
performance-based   compensation  criteria  are  satisfied.   While  it  is  the
Committee's firm belief and intent that  compensation  from base salary and cash
bonus  payments will not approach the annual  Section  162(m)  limitation in the
foreseeable future, additional "compensation" from the exercise of option grants
pursuant  to the  Company's  stock  option  plans  could  result  in the  annual
limitation being exceeded. Accordingly, the Company's 1990 and 1996 Stock Option
Plans contain certain provisions which exempt  compensation  resulting from such
option exercises from the $1 million limitation.  The Committee will continue to
monitor all forms of compensation  to its executive  officers to ensure that the
Company may maximize the tax benefits of such compensation.

Directors Compensation Committee

     Michael E. Herman, Chairman
     John N. Abelson, Ph.D.
     A. E. Cohen

DIRECTORS COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION

     The  Directors  Compensation  Committee  is composed  exclusively  of three
outside  directors:  Mr. Herman,  Mr. Cohen and Dr. Abelson.  The Company is not
aware of any Committee interlocks.


                                       18
<PAGE>


PERFORMANCE MEASUREMENT COMPARISON(1)

The chart set forth below shows the value of an  investment  of $100 on June 30,
1993  in the  Existing  Common  Stock,  The  Nasdaq  Stock  Market  Index  (U.S.
Companies) ("Nasdaq Market (US)") and the Nasdaq  Pharmaceuticals Index ("Nasdaq
Pharmaceuticals").  The total  returns  assume the  reinvestment  of  dividends,
although cash dividends have not been declared on the Existing Common Stock. The
Existing Common Stock is traded on The Nasdaq Stock Market and is a component of
both  the  Nasdaq  Market  (US)  and  the  Nasdaq   Pharmaceuticals  Index.  The
comparisons in the chart are required by the Securities and Exchange  Commission
and  are  not  intended  to  forecast  or be an  indicator  of  possible  future
performance of the Company's Common Stock.

[OBJECT OMITTED]
- -------------
                         6/30/93  6/30/94  6/30/95  6/30/96  6/30/97  6/30/98
                         -------  -------  -------  -------  -------  -------

Agouron Common Stock     $100.00  $112.50  $236.26  $390.00  $808.76  $606.20
Nasdaq market (US)        100.00   100.96   134.77   173.03   210.38   277.69
Nasdaq Pharmaceuticals    100.00    83.65   111.03   163.50   166.34   170.68

- ----------------
(1)  This  section is not  "soliciting  material,"  is not deemed filed with the
     Securities  and  Exchange  Commission  and  is not  to be  incorporated  by
     reference  in any filing of the  Company  under the  Securities  Act or the
     Exchange Act.


                                       19
<PAGE>


ITEM 12.      SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

     The following table sets forth  information as of October 19, 1998 relating
to the  beneficial  ownership  of the  Existing  Common Stock by (i) each person
known by the Company to beneficially own more than 5% of the outstanding  shares
of the Company's Common Stock,  (ii) each director,  (iii) each of the executive
officers named in the Summary  Compensation  Table below, and (iv) all executive
officers and directors as a group.
<TABLE>
<CAPTION>
                                                                                  Beneficial Ownership(1)         
                                                                         Number of                 Percentage of
         Beneficial Owner                                                 Shares(9)                    Total    
- ------------------------------                                        ---------------              -------------
<S>                                                                    <C>                              <C>   
     Wellington Management Co.                                         5,196,000                        16.61%
         75 State Street, Boston, MA 02109
     T. Rowe Price                                                     2,420,000                         7.74%
         100 E. Pratt St., Baltimore, MD 21202
     Peter Johnson(2)                                                    706,533                         2.22%
     Gary E. Friedman(2) Family Trust(8)                                 294,123                         *
     John N. Abelson(2)(3)(6)                                            102,943                         *
     Patricia M. Cloherty(2)                                              27,659                         *
     A. E. Cohen(2)                                                       73,333                         *
     Michael E. Herman(2)(4)                                              83,333                         *
     Irving S. Johnson(2)                                                 41,933                         *
     Antonie T. Knoppers(2)                                               51,533                         *
     Melvin I. Simon(2)(3) and Linda F. Simon Living Trust(5)            122,843                         *
     Marvin R. Brown                                                     194,995                         *
     Barry D. Quart                                                      152,481                         *
     R. Kent Snyder(7)                                                   175,035                         *
All executive officers and directors as a group (19 persons)           2,706,671                         8.14%
</TABLE>
- -------------------
*    less than 1%.
(1)  Unless otherwise  indicated,  the persons named in the above table exercise
     sole voting and investment  powers with respect to all shares  beneficially
     owned by them, subject to applicable community property laws. The number of
     shares  beneficially owned includes the following number of shares issuable
     upon  exercise of stock options  exercisable  within 60 days of October 19,
     1998: Mr.  Johnson,  596,923 shares;  Mr.  Friedman,  241,599  shares;  Dr.
     Abelson,  33,333 shares;  Ms. Cloherty,  13,333 shares;  Mr. Cohen,  43,333
     shares;  Mr.  Herman,  39,333  shares;  Dr.  Johnson,  15,833  shares;  Dr.
     Knoppers,  43,333  shares;  Dr. Simon,  33,333  shares;  Dr. Brown,  23,077
     shares;  Dr. Quart,  117,266 shares;  Mr. Snyder,  168,932 shares;  and all
     executive officers and directors as a group, 1,952,280 shares.
(2)  Director.
(3)  Does not include 1,106,000 shares held by The Agouron  Institute,  of which
     Drs. Abelson and Simon are directors.  As directors,  they share voting and
     investment powers as to the shares held by The Agouron Institute.
(4)  Includes 20,000 shares held by the Herman Family Trading Company,  a family
     partnership of which Mr. Herman is the general partner,  10,000 shares held
     by Vail  Fishing  Partners in which Mr.  Herman has a 50%  general  partner
     interest  and  2,000  shares  held by Mrs.  Herman,  of  which  Mr.  Herman
     disclaims any beneficial ownership.
(5)  Shared voting and investment power.
(6)  Includes  2,350  shares  held by Dr.  Abelson  as  custodian  for his minor
     children, of which Dr. Abelson disclaims any beneficial ownership.
(7)  Includes 800 shares held by immediate  family  members, of which Mr. Snyder
     disclaims any beneficial ownership.
(8)  Includes 5,408 shares held by wife as custodian for minor children of which
     Mr. Friedman disclaims any beneficial ownership.
(9)  Adjusted  to reflect  the  two-for-one  stock  split in the form of a stock
     dividend in August 1997.

                                       20
<PAGE>



ITEM 13.      CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

     All transactions with affiliates have been and will continue to be on terms
no less  favorable  to the  Company  than could be  obtained  from  unaffiliated
parties.  Furthermore, all transactions with affiliates and any loans to Company
officers,  affiliates  or  shareholders  must be  approved  by a majority of the
disinterested directors.

     As permitted by California law, the Articles of Incorporation and bylaws of
the Company  currently  provide for the  limitation  of director  liability  for
monetary  damages for breach of duty to the Company and for  indemnification  of
agents (including  officers and directors) to the fullest extent permitted under
the  California   General   Corporation   Law.  The  Company  has  entered  into
Indemnification Agreements with all of its directors and officers. Additionally,
the Company has in effect a directors and officers  liability  insurance  policy
which insures  directors  and officers of the Company  against loss arising from
claims made against them due to wrongful  acts while acting in their  individual
and collective capacities as directors and officers.


                                       21
<PAGE>


                                     PART IV


ITEM 14.      EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

 (A)          LIST OF DOCUMENTS FILED AS PART OF THIS REPORT:

              (1)     Financial Statements and Supplementary Data
                      Reference is made to the Index to Financial Statements and
                      Schedules  under  Item 8 in Part II  hereof,  where  these
                      documents are listed.
              (2)     Exhibits - see (c) below

 (B)          REPORTS ON FORM 8-K

     No reports on Form 8-K were filed during the fourth quarter of fiscal 1998.

(C)           EXHIBITS

         Exhibit
         Number                             Exhibit
         -------      --------------------------------------------------------- 
           2.1(a)     Agreement and Plan of Reorganization dated as of April 28,
                      1997,  between  Agouron  Pharmaceuticals,   Inc.,  Agouron
                      Acquisition Corporation and Alanex Corporation.
           3.1(b)     Restated Articles of Incorporation (December 10, 1992).
           3.2(c)     Amended and Restated Bylaws (Restated June 17, 1991).
           4.1(d)     Rights  Agreement  dated  November 7, 1996,  as amended on
                      November  27,  1996,  between the Company and Chase Mellon
                      Shareholder  Services.  L.L.C., which includes, as Exhibit
                      A,  the  Certificate  of  Determination,  Preferences  and
                      Rights of Series B Participating  Preferred Stock as filed
                      with the  California  Secretary  of State on November  20,
                      1996.
         10.01(h)     1990 Stock Option Plan (Restated November 2, 1995).
         10.02(k)     Form of 1990 Incentive Stock Option Agreement.
         10.03(k)     Form of 1990 Non-Statutory Stock Option Agreement for
                      Employees/Officers/Directors.
         10.04(k)     Form of 1990 Non-Statutory Stock Option Agreement for 
                      Consultants.
         10.05(c)     1985 Stock Option Plan (Last Amended August 14, 1991).
         10.06(e)     Agouron Pharmaceuticals, Inc. 401(k) Plan (Amended August
                      1992).
         10.07(b)     Agouron Pharmaceuticals, Inc. Employee Stock Purchase Plan
                      (October 15, 1992).
         10.08(b)     Agouron Pharmaceuticals, Inc. Flexible Benefits Plan
                      (December 10, 1992).
         10.09(f)     Agreement  Two  dated  February  28,  1994  between  Japan
                      Tobacco  Inc.  and  the  Company.
                      (Portions of the agreement receive confidential  treatment
                      pursuant to an application  filed April 25, 1994; File No.
                      0-15609).

                                       22
<PAGE>


        Exhibit
        Number                             Exhibit                             
        -------       ----------------------------------------------------------
         10.10(g)     Development  and License  Agreement dated December 1, 1994
                      between  Japan  Tobacco Inc. and the Company  (Portions of
                      the agreement receive  confidential  treatment pursuant to
                      an application dated January 31, 1995).
         10.11(h)     First  Amendment  to  Development  and  License  Agreement
                      effective  December 1, 1994 between Japan Tobacco Inc. and
                      the Company.  (Confidential  treatment has been  requested
                      for portions of this agreement  pursuant to an application
                      dated January 31, 1996. The underlying agreement was filed
                      as  Exhibit  10.54  on  Form  10-Q  for the  period  ended
                      December  31,   1994,   and   portions   thereof   receive
                      confidential   treatment  pursuant  to  an  order  of  the
                      Securities and Exchange Commission dated June 28, 1995.)
         10.12(i)     Amendment effective January 1, 1996 to the Agouron 
                      Pharmaceuticals, Inc. 401(k) Plan.
         10.13(j)     1996 Stock Option Plan.
         10.14(j)     Form of 1996 Incentive Stock Option Agreement.
         10.15(j)     Form  of  1996  Non-Statutory Stock Option  Agreement  for
                      Employees/Officers/Directors.
         10.16(j)     Form  of  1996  Stock  Option Agreement for Consultants
         10.17(l)     Second Amendment to Development and License Agreement 
                      effective January 17, 1997 between Japan   Tobacco  Inc.
                      and  the  Company.(Confidential treatment   has  been 
                      requested  for  portions  of  this agreement  pursuant to
                      an  application  dated  August 21, 1997, as separately
                      filed with the Securities and Exchange  Commission.  The
                      underlying agreement was filed as Exhibit 10.54 on 
                      Form 10-Q for the period ended December 31, 1994,
                      and  portions  thereof  receive   confidential   treatment
                      pursuant  to an  order  of  the  Securities  and  Exchange
                      Commission dated June 28, 1995.)
         10.18(l)     Third  Amendment  to  Development  and  License  Agreement
                      effective  December 1, 1996 between Japan Tobacco Inc. and
                      the Company.  (Confidential  treatment has been  requested
                      for portions of this agreement  pursuant to an application
                      dated  August  21,  1997,  as  separately  filed  with the
                      Securities   and  Exchange   Commission.   The  underlying
                      agreement  was filed as Exhibit 10.54 on Form 10-Q for the
                      period  ended  December 31,  1994,  and  portions  thereof
                      receive confidential treatment pursuant to an order of the
                      Securities and Exchange Commission dated June 28, 1995.)
         10.19(l)     VIRACEPT License  Agreement  between the Company and Japan
                      Tobacco Inc. and F.  Hoffmann-La  Roche Ltd dated June 30,
                      1997.  (Confidential  treatment  has  been  requested  for
                      portions  of this  agreement  pursuant  to an  application
                      dated  August  21,  1997,  as  separately  filed  with the
                      Securities and Exchange Commission.)
         10.20(m)     Form of 1998 Employee Stock Option Plan.
         10.21(m)     Form of 1998 Employee Non-Statutory Stock Option 
                      Agreement.


                                       23
<PAGE>


         Exhibit
         Number                             Exhibit
         -------      ----------------------------------------------------------
         10.22        License and Supply Agreement between the Company and Japan
                      Energy   Corporation   effective  as  of  June  30,  1998.
                      (Confidential treatment has been requested for portions of
                      this agreement  pursuant to an application dated August 4,
                      1998, as separately filed with the Securities and Exchange
                      Commission.)
         10.23        Common  Stock  Purchase   Agreement   between  The  Immune
                      Response  Corporation and the Company dated June 11, 1998.
                      (Confidential treatment has been requested for portions of
                      this agreement  pursuant to an application dated August 4,
                      1998, as separately filed with the Securities and Exchange
                      Commission.)
         10.24        Amendment to the VIRACEPT  License  Agreement  between the
                      Company and Japan  Tobacco Inc. and F.  Hoffmann-La  Roche
                      Ltd as of May 1, 1998.  (Confidential  treatment  has been
                      requested  for portions of this  agreement  pursuant to an
                      application dated August 4, 1998, as separately filed with
                      the Securities and Exchange Commission.)
         21*          Subsidiaries of Agouron Pharmaceuticals, Inc.
         23.1*        Consent of Independent Accountants.
         27*          Financial  Data  Schedule.  (Exhibit 27 is  submitted  as
                      an exhibit  only in the  electronic format of this Annual
                      Report  on Form  10-K  submitted  to the  Securities  and
                      Exchange Commission.)
         99*          Important Factors Regarding Forward-Looking Statements.

 ----------------------
(a)  Incorporated by Reference to Form 8-K filed on May 23, 1997.
(b)  Incorporated  by  Reference  to Form 10-Q filed for the quarter  ended
     December 31, 1992.
(c)  Incorporated by Reference to Form 10-K filed for the
     year ended June 30, 1991.  
(d)  Incorporated  by  Reference  for Form 8-K/A
     filed on December  20,  1996.  
(e)  Incorporated  by Reference to Form 10-K
     filed for the year ended June 30, 1992.  
(f)  Incorporated  by Reference to
     Form 10-Q/A filed for the quarter ended March 31, 1994. 
(g)  Incorporated by
     Reference to Form 10-Q filed for the quarter ended  December 31, 1994.  
(h)  Incorporated by Reference to Form 10-Q filed for the quarter ended December
     31, 1995. 
(i)  Incorporated by Reference to Form 10-Q filed for the quarter
     ended March 31, 1996.  
(j)  Incorporated  by Reference to Form S-8 filed on
     November  26,  1996.  
(k)  Incorporated  by  Reference to Form 10-Q for the
     quarter ended December 31, 1996. 
(l)  Incorporated by Reference to Form 10-K
     for the year ended June 30, 1997. 
(m)  Incorporated by Reference to Form S-8
     filed on February 19, 1998.

* - Previously filed.

                                       24
<PAGE>


                                   Signatures

     Pursuant  to the  requirements  of  Section  13 or 15(d) of the  Securities
Exchange Act of 1934, the registrant has duly caused this report to be signed on
its behalf by the undersigned, thereunto duly authorized.
                          
                                   AGOURON PHARMACEUTICALS, INC.



October 28, 1998                   By:  /s/ Steven S. Cowell              
                                        ----------------------------
                                   Steven S. Cowell
                                   Corporate Vice President
                                   Chief Financial Officer


                                       25
<PAGE>


                                  Exhibit Index


         Exhibit
         Number                             Exhibit
         -------      ----------------------------------------------------------
         10.22        License and Supply Agreement between the Company and Japan
                      Energy   Corporation   effective  as  of  June  30,  1998.
                      (Confidential treatment has been requested for portions of
                      this agreement  pursuant to an application dated August 4,
                      1998, as separately filed with the Securities and Exchange
                      Commission.)
         10.23        Common  Stock  Purchase   Agreement   between  The  Immune
                      Response  Corporation and the Company dated June 11, 1998.
                      (Confidential treatment has been requested for portions of
                      this agreement  pursuant to an application dated August 4,
                      1998, as separately filed with the Securities and Exchange
                      Commission.)
         10.24        Amendment to the VIRACEPT  License  Agreement  between the
                      Company and Japan  Tobacco Inc. and F.  Hoffmann-La  Roche
                      Ltd as of May 1, 1998.  (Confidential  treatment  has been
                      requested  for portions of this  agreement  pursuant to an
                      application dated August 4, 1998, as separately filed with
                      the Securities and Exchange Commission.)
         21*          Subsidiaries of Agouron Pharmaceuticals, Inc.
         23.1*        Consent of Independent Accountants.
         27*          Financial  Data  Schedule.  (Exhibit 27 is  submitted  as 
                      an exhibit  only in the  electronic format of this  Annual
                      Report  on Form  10-K  submitted  to the  Securities  and
                      Exchange Commission.)
         99*          Important Factors Regarding Forward-Looking Statements.


         * - Previously filed.



                                       26
<PAGE>

                                                         
                                                                   
   PORTIONS OF THIS DOCUMENT HAVE BEEN OMITTED (DESIGNATED BY AN ASTERISK (*)
          AND WHITE SPACE) AND FILED SEPARATELY WITH THE SECURITIES AND
                 EXCHANGE COMMISSION PURSUANT TO A REQUEST FOR
          CONFIDENTIAL TREATMENT DATED AUGUST 4, 1998; FILE NO. 0-15609

                          LICENSE AND SUPPLY AGREEMENT

         This License and Supply  Agreement  ("Agreement"),  effective as of the
30th day of June 1998, is by and between Japan Energy Corporation, a corporation
duly  organized  and existing  under the laws of Japan and having its  principal
place of business at 10-1, Toranomon 2-chome,  Minato-ku,  Tokyo 105-8407, Japan
(hereinafter  referred  to  as  "JE"),  and  Agouron  Pharmaceuticals,  Inc.,  a
corporation  duly  organized  and  existing  under  the  laws  of the  State  of
California,  U.S.A.,  and having its principal  place of business at 10350 North
Torrey Pines Road, La Jolla,  California 92037, U.S.A.  (hereinafter referred to
as "Agouron").  JE and Agouron are sometimes  hereinafter  each referred to as a
Party (collectively "Parties") to this Agreement.

                                   BACKGROUND

         JE possesses technical information and know-how pertaining to a certain
pharmaceutical compound designated JE-2147 and its related compounds that may be
useful  in  the  treatment  and  prevention  of  Human   Immunodeficiency  Virus
infections and other diseases.

         The Parties entered into a Confidentiality Agreement effective December
31, 1997 (the  "Confidentiality  Agreement") and a Material  Transfer  Agreement
effective  December 31, 1997 (the "Material  Transfer  Agreement"),  pursuant to
which Agouron has undertaken certain evaluations of JE-2147.

         JE  holds  patents  rights   pertaining  to  JE-2147  and  its  related
compounds.

         Agouron  desires  to obtain a  license  from JE to  enable  Agouron  to
develop and commercialize  Product (as hereinafter defined) in certain countries
of the  world,  and JE is  willing  to  grant  such  license  on the  terms  and
conditions hereinafter set forth.

         The Parties  wish to  cooperate  under the terms of this  Agreement  to
optimize the development and commercialization of Product.

         The Parties also wish to confirm their arrangement regarding the supply
of  Compound  by JE to Agouron  and the supply of Product by Agouron to JE (both
terms as hereinafter defined).

         On June 30, 1998, the parties  executed and delivered to each other, by
telefax,  a prior version of this  Agreement.  The parties now wish to supersede
such prior  version of this  Agreement  and to formally  enter into this revised
version of this Agreement.

         NOW,  THEREFORE,  in  consideration  of the  premises,  and the  mutual
covenants,  benefits and  obligations  set forth  herein,  the Parties  agree as
follows:
<PAGE>

                             ARTICLE I - DEFINITIONS

         When  used in this  Agreement,  the  following  terms  shall  have  the
meanings set out in this Article I. Except as otherwise explicitly provided, all
references to Articles and Sections  shall refer to the Articles and Sections of
this Agreement, and all references to Attachments,  Exhibits and Schedules shall
refer to the Attachments, Exhibits and Schedules to this Agreement, all of which
are incorporated herein by reference.

         SECTION 1.01 "Affiliate" means any person,  organization or entity that
is, directly or indirectly,  controlling, controlled by, or under common control
with JE or  Agouron,  as the case may be. The term  "control"  (including,  with
correlative meaning, the terms "controlled by" and "under common control with"),
as  used  with  respect  to  any  person,  organization  or  entity,  means  the
possession,  directly  or  indirectly,  of the  power to  direct,  or cause  the
direction  of, the  management  and  policies of such  person,  organization  or
entity,  whether through the ownership of voting  securities,  or by contract or
court  order or  otherwise.  The  ownership  of voting  securities  of a person,
organization  or entity shall not, in and of itself,  constitute  "control"  for
purposes  of this  definition,  unless  said  ownership  is of a majority of the
outstanding securities entitled to vote of such person,  organization or entity.
Affiliate shall also mean a limited partnership in which a subsidiary of Agouron
and/or JE is a general partner.

         SECTION 1.02 "Combination Product" means any pharmaceutical  product in
any dosage form that contains, in addition to * , one (1) or more * having *.
                                              .

         SECTION 1.03  "Compound"  means the chemical  compound  known by the JE
code name JE-2147 ("JE-2147"), whose chemical structure is as follows:






                                        *
                              (chemical structure)

     The definition of Compound also means: (i) * JE-2147; * JE-2147, * .

         SECTION 1.04  "Compound  Supply Plan" means the supply plan under which
JE will provide Compound to Agouron in accordance with the provisions of Section
4.04.

         SECTION 1.05 "Control," "Controlled" or "Controlling" means possession,
now or in the  future,  of the  ability  to grant a license  or  sublicense,  as
provided for herein,  without  violating  the terms of any  agreement  with,  or
arrangement with, or the rights of any third party.
<PAGE>

         SECTION  1.06  "Development  Program"  means all normal  and  customary
activities by or on behalf of JE or Agouron,  independently  or jointly,  as the
case may be, that are necessary for the timely  development of Compound and/or a
Product,  including,  but not limited to: (i) formulation and stability studies;
(ii) other non-clinical studies, including toxicology studies (or the applicable
equivalent), in preparation for regulatory submissions;  (iii) virology studies,
including   resistance  and  cross-resistance   studies;   (iv)  manufacture  of
preclinical and clinical materials and supplies;  (v) planning,  implementation,
evaluation,  administration  and  conduct of human  clinical  trials,  including
pharmaco-economic, quality of life and other clinical studies that are necessary
for the purposes of  Registration  or to expand the labeling of a Product;  (vi)
manufacturing  process  development  and  scale-up;  and (vii)  preparation  and
submission of  Registration  applications.  The normal and customary  activities
necessary for timely  development of Compound  and/or Product for indications in
the Field are, or will be, described  generally in the Development  Program that
is described in Exhibit 1, as such exhibit is amended in the future.

         SECTION 1.07  "Development  Program  Patent Rights" means patent rights
covering those  inventions  conceived or reduced to practice in the  Development
Program after the Effective  Date of this  Agreement  that are contained in: (i)
any patent  applications or issued patents that are,  respectively,  filed after
the Effective Date of this Agreement or issued from patent applications that are
filed after the Effective Date of this Agreement in the United States and/or any
other countries  throughout the world, and that are Controlled by either or both
of the Parties; and (ii) any reissues, extensions (or other governmental actions
that  provide  exclusive  rights to the patent  holder in the  patented  subject
matter   beyond   the   original   patent   expiration   date),   substitutions,
confirmations,   registrations,   revalidations,   re-examinations,   additions,
continuations,   continuations-in-part,  or  divisions  of  or  to  any  of  the
foregoing;   such  inventions  shall  include,   but  not  be  limited  to,  any
compositions  of matter of  intermediates  of the  Compound,  methods  of use or
processes of making the  Compound,  intermediates  thereof,  or Products,  which
compositions  of matter,  methods of use or  processes  of making the  Compound,
intermediates  thereof or Products  are  conceived or reduced to practice in the
Development  Program after the  Effective  Date of this  Agreement.  Development
Program Patent Rights shall not include any inventions  that are included in the
JE Patent Rights.  For purposes of this  Agreement,  the terms  "conceived"  and
"reduced to practice"  shall have the meanings  determined  under United  States
law, regardless of where such inventive acts take place.

         SECTION 1.08 "Development Program Technology" means any know-how, trade
secret,  experimental data, formula, expert opinion,  experimental procedure and
other confidential and/or proprietary  information  specifically  concerning the
Compound,  intermediates  thereof, or a Product that is developed or acquired by
or on behalf of JE or Agouron,  independently or jointly, as the case may be, in
the  Development  Program after the Effective  Date of this  Agreement  that are
useful or necessary for either: (i) the formulation (including sustained-release
formulations),  manufacture,  use  and/or  application  of a  Product;  or  (ii)
obtaining Registration of a Product,  including, but not limited to, information
and  data  arising  out  of  pre-clinical   and  clinical  trials  and  all  NDA
applications,  and  which is under  the  Control  of JE and  Agouron,  solely or
jointly. Development Program Technology shall not include JE Technology.
<PAGE>

         SECTION  1.09  "Dossier"  means  the  document  that is filed  with and
approved by a government or health authority for purposes of  Registration,  for
example, a Marketing Authorization Application.

         SECTION 1.10 "Effective Date" means June 30, 1998.

         SECTION  1.11 "EMEA" means the European  Agency for the  Evaluation  of
Medicinal Products.

         SECTION 1.12"FDA" means the United States Food and Drug Administration.

         SECTION  1.13  "Field"  means the  treatment  and  prevention  of Human
Immunodeficiency Virus ("HIV") infections.

         SECTION 1.14 "Initial Commercial Sale" means the first commercial sale 
of a Product *

         SECTION 1.15 "JE Territory" means Japan, Taiwan, South Korea 
and North Korea.

         SECTION  1.16 "JE Patent Rights" means: (i) the patents  and the patent
applications  that are  referred  to in Schedule 1 of this  Agreement;  (ii) all
patents * , and all  patents  and patent  applications  based on, or claiming or
corresponding  to the * of any * ; or (iii) any reissues,  extensions  (or other
governmental  actions that provide  exclusive rights to the patent holder in the
patented   subject  matter  beyond  the  original   patent   expiration   date),
substitutions,  confirmations,  registrations,  revalidations,  re-examinations,
additions,  continuations,  continuations-in-part,  or divisions of or to any of
the foregoing.

         SECTION  1.17  "JE  Technology"  means  any  know-how,   trade  secret,
experimental data, formula, expert opinion,  experimental  procedure,  and other
confidential  and/or  proprietary   information   specifically   concerning  the
Compound,  intermediates thereof, or a Product that was developed or acquired by
or on behalf of JE before the Effective Date of this Agreement that is necessary
or  useful  for  either:  (i)  the  formulation   (including  sustained  release
formulations),  manufacture,  use  and/or  application  of a  Product;  or  (ii)
obtaining Registration of a Product,  including, but not limited to, information
and  data  arising  out  of  pre-clinical   and  clinical  trials  and  all  NDA
applications, and which is Controlled by JE.

         SECTION 1.18  "Licensed  Territory"  means all  countries of the world,
except for Japan, Taiwan, South Korea and North Korea.

         SECTION 1.19 "MAA" means Marketing Authorization Application.

         SECTION 1.20 "Major Market European Country" means the United  Kingdom,
France,  Germany,  Spain or Italy.
<PAGE>

         SECTION 1.21 "Net Sales" means the gross amount invoiced for Product by
Agouron, its Affiliates and sublicensees to non-Affiliated third parties,  other
than separately itemized  transportation  costs, and sales taxes and other taxes
that are  directly  linked to and  included  in the gross  amount  invoiced,  as
computed on a product-by-product  basis for the countries  concerned,  less: (i)
deductions for returns, credits for rejected goods, and rebates, chargebacks and
allowances; (ii) usual and customary *  , sales  commissions,  transportation
insurance  charges,  normal  handling and packaging costs, and customs duties 
and other governmental charges.

         SECTION  1.22  "New  Drug  Application"  or  "NDA"  means  a  new  drug
application,  product license application or comparable regulatory submission to
the FDA,  the EMEA or an  equivalent  agency of a country in the  Territory  for
permission to commence commercial sale of a Product.

         SECTION 1.23 "Patent Rights" means, collectively,  JE Patent Rights and
Development Program Patent Rights.

         SECTION 1.24 "Product" means any  pharmaceutical  product in any active
ingredient form or finished-dosage  form that contains the Compound,  including,
without limitation, Combination Products.

         SECTION  1.25  "Registration"   means  the  official  approval  by  the
government  or health  authority in a country (or  supra-national  organization,
such as the European  Agency for the  Evaluation of Medicinal  Products) that is
required for a Product to be offered for sale in such  country,  including  such
authorizations  as may be required  for the  production,  importation,  pricing,
reimbursement and sale of such Product,  and for subsequent  regulatory  filings
for line extensions and/or additional indications of such Product.

         SECTION 1.26      "Territory" means the world.

         SECTION 1.27 "Trade Dress" means any materials directly  supporting the
commercialization  of a  Product,  including,  but not  limited  to,  packaging,
package inserts,  advertising or selling aids, brochures,  mailings and/or other
marketing or packaging materials.

         SECTION 1.28 "Trademark(s)" means any trademark selected and owned by a
Party and  registered  (or applied  for) by such  Party,  its  Affiliate(s)  and
sublicensee(s)  in the  Territory  for use in  connection  with the marketing of
Products.  The  definition  of  Trademark(s)  shall not refer to trade  names or
designs such as logos used by a Party to designate the name of such Party.

         SECTION  1.29  "United  States" or "U.S."  means the  United  States of
America, its territories, possessions and protectorates (including Puerto Rico),
and the District of Columbia.
<PAGE>

         SECTION 1.30 "Valid Claim" means a claim within issued and  enforceable
JE Patent Rights,  which claim has not been:  (i) abandoned or disclaimed;  (ii)
declared invalid or unenforceable by a decision of a court or other governmental
agency of competent  jurisdiction  that is unappealable or unappealed within the
time allowed for appeal; or (iii) admitted by JE to be invalid.

                         ARTICLE II - COMMERCIAL RIGHTS

         SECTION  2.01  LICENSE   GRANTS.   To  implement  the  development  and
commercialization of Compound and/or Products, the Parties, subject to the other
applicable  provisions of this  Agreement,  grant and accept the license  rights
provided below in this Article II.

         (a) Subject to the  provisions  of Section  2.01(c),  and Article V, JE
grants Agouron the exclusive right, even as to JE (with right of sublicense), to
use,  offer for sale,  sell  and/or  import in or into the  Licensed  Territory,
Compound and Products under applicable JE Patent Rights and Development  Program
Patent  Rights,  and using  applicable JE  Technology  and  Development  Program
Technology.

         (b) Subject to the provisions of Sections 2.01(c) and 4.04, and Article
V, JE grants  Agouron the  non-exclusive  right in the Territory  (with right of
sublicense)  under  applicable JE Patent Rights and  Development  Program Patent
Rights,  and using applicable JE Technology and Development  Program  Technology
to:  (i) make  and/or  have made  Compound,  intermediates  thereof  used in the
process  of  making  Compound  and/or  Products;  (ii)  use  or  have  used  any
intermediate(s) of Compound in the process of making Compound; and (iii) conduct
Development Program activities *
using  Compound  and/or  Product  in  countries  located  outside  the  Licensed
Territory,  which Agouron deems necessary or useful in obtaining Registration of
a Product  in the  Licensed  Territory.  It is  understood  and agreed to by the
Parties that Agouron shall have no rights to utilize the license  rights granted
in this  Section  2.01(b)(i)  and (ii) to make  and/or  have made  Compound  for
commercial  use unless and until Agouron  becomes  entitled to make  independent
arrangements  for the supply of Compound  pursuant to the  provisions of Section
4.04,and any such  exercise of these  license  rights is subject to the terms of
Section 4.04 and/or as otherwise set forth in the Agreement.

         (c) If Agouron has determined to enter into a sublicense agreement with
a non-Affiliated  third party,  Agouron shall notify JE of such fact,  including
the  expected  marketing  territory  and the names of any  non-Affiliated  third
parties which Agouron then intends to contact  concerning such sublicense.  When
Agouron enters into a sublicense agreement with a non-Affiliated third party, it
agrees to forward to JE within * after executing such  sublicense,  the name and
address of the new sublicensee,  as well as the *      .  Additionally,  Agouron
shall provide JE with written  evidence that each  sublicensee  has agreed to be
bound by the applicable terms and obligations of the licenses granted to Agouron
under this  Agreement  (including,  without  limitation,  Agouron's * ). Agouron
hereby acknowledges that any act or omission


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of a  sublicensee  that  would be a breach of this  Agreement  if  performed  by
Agouron, shall be deemed to be a breach by Agouron of this Agreement.

         (d)  Notwithstanding  the terms of this Section 2.01 and subject to the
provisions of Section  4.02(n),  each Party shall have a paid-up,  royalty-free,
non-exclusive right to use the Compound,  intermediates  thereof and/or Products
     in its * . Each Party shall give prior  written  notice to the other of its
intention to conduct any such * which are to be undertaken in the*    .

         (e) Agouron grants JE a paid-up, royalty-free non-exclusive right (with
right of  sublicense)  in the JE  Territory  to use the  applicable  Development
Program Patent Rights and applicable Development Program Technology in: (i) * of
Product in the JE Territory for indications in the Field;  and (ii) * Product in
the JE Territory for indications in the Field.

         (f)  Agouron  grants JE a  paid-up,  royalty-free  non-exclusive  right
anywhere  in  the  Territory  (with  right  of  sublicense)   under   applicable
Development  Program Patent Rights,  and using  applicable  Development  Program
Technology to: (i) * the Compound,  intermediates thereof used in the process of
making Compound and/or Products;  (ii) * any  intermediate(s) of Compound in the
process of making the Compound; and (iii) conduct Development Program activities
*          using   Compound   and/or
Product  in the  Licensed  Territory,  which JE deems  necessary  or  useful  in
obtaining  Registration of a Product in the JE Territory.  Agouron  acknowledges
that JE has the * in the JE  Territory  under  applicable  JE Patent  Rights and
using applicable JE Technology.

         (g) Agouron grants JE a paid-up, royalty-free non-exclusive right (with
right of  sublicense)  in the JE  Territory  to * Compound  and/or  Products for
indication(s)*  under  applicable  Development  Program Patent Rights that cover
inventions  which  were  * in the  Development  Program  by  Agouron  and  using
applicable  Development  ProgramTechnology that is * for the utilization of such
Development  Program  Patent  Rights.  Upon  discovery of an  indication(s)  * ,
Agouron shall promptly notify JE about such discovery.  JE's non-exclusive right
in the JE Territory to develop and  commercialize  Compound  and/or Products for
such specific  indication(s) * , shall be subject to JE's use of development and
commercialization efforts for such specific indication(s) * in the JE Territory.
Agouron acknowledges that JE has the * under  applicable  JE Patent  Rights  and
using applicable JE Technology.

         (h) Subject to the  provisions  of Section  4.04,  Agouron shall have a
paid-up, royalty-free, non-exclusive right anywhere in the Territory (with right
of sublicense) to *               originally    developed    outside    of   the
Development  Program that is * the Development  Program by JE, and any * thereon
developed in the Development Program for making,  having made, using and selling
the 
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Compound,  intermediates  thereof and/or Products in the Licensed Territory.
Subject  to  the   provisions   of  Section  4.04,  JE  shall  have  a  paid-up,
royalty-free,  non-exclusive  right  anywhere  in the  Territory  (with right of
sublicense) to *   developed outside of the Development Program that is utilized
in the  Development  Program  by  Agouron,  and any * thereon  developed  in the
Development  Program for making,  having made,  using and selling the  Compound,
intermediates thereof and/or Products in the JE Territory.  It is understood and
agreed  to by the  Parties  that *      shall  have *  granted  in this  Section
2.01(h)  to make  and/or  have  made * unless  and  until *  entitled  to make *
pursuant  to the  provisions  of  Section  4.04 and any such  exercise  of these
license  rights is subject to the terms of Section 4.04 and/or as otherwise  set
forth in the Agreement.

     (i) If a Party wishes to receive a non-exclusive license to which it is not
otherwise entitled under this Agreement to use * Compound and/or * Controlled by
another  Party,  which * is developed or acquired by the other Party  outside of
the  Development  Program  after * of this  Agreement  and which is required for
making,  having  made,  using and selling the  Compound,  intermediates  thereof
and/or  Products,  then the  Parties  shall  enter into good faith  negotiations
regarding the terms of such license. If a Party wishes to receive other licenses
to which it is not otherwise  entitled under this Agreement from the other Party
to * that such other Party  Controls  and which the Party  considers  useful for
making,  having  made,  using and selling the  Compound,  intermediates  thereof
and/or  Products,  then the Parties  shall  discuss the terms of such  licenses;
provided,  however,  that the other Party shall have no obligation to grant such
licenses.

     (j) Until the * , JE hereby grants to Agouron (with right of  sublicense) a
paid-up,  royalty-free,  non-exclusive  right to use the JE's  Trademark(s)  and
Trade Dress in the  applicable  country in the marketing of Products.  After the
expiration  of any royalty  obligations  * , JE hereby  grants to Agouron  (with
right of sublicense) *
of such Products in such country,  any  Trademark(s)  and Trade Dress previously
used to market such  Products in such  country;  if Agouron * , then the Parties
shall enter into good-faith  negotiations  regarding the royalty rate to be paid
to JE and the other terms of such license.

     (k) Until the * , Agouron  hereby grants to JE (with right of sublicense) a
paid-up,  royalty-free,  non-exclusive  right to use Agouron's  Trademark(s) and
Trade Dress in * in the  marketing of  Products.  After the  expiration  of such
royalty  obligations  in the * ,  Agouron  agrees to grant to JE (with  right of
sublicense * of such Products in such country,  any Trademark(s) and Trade Dress
previously  used to market  such  Products in such  country;  if JE * , then the
Parties shall enter into good-faith  negotiations  regarding the royalty rate to
be paid to Agouron and the other terms of such licenses.
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     (l) Agouron agrees to use reasonable efforts to not sell Product in the
Licensed  Territory to persons who it knows,  or has reason to know, will resell
and/or transfer such Product outside of the Licensed Territory.

     SECTION 2.02      DISCONTINUANCE OF THE DEVELOPMENT PROGRAM.

     (a) Agouron  shall,  in a timely manner,  use  reasonable  diligence in the
development  and  Registration  of a  Product  in  the  Field  in  the  Licensed
Territory.  Reasonable  diligence  means a commercially  reasonable  standard of
effort  based on the  commercial  potential  for such  Product  in the  Licensed
Territory.   Development   efforts   undertaken  by  Agouron's   Affiliates  and
sublicensees  shall be  attributed  to Agouron.  If, after  receipt of * written
notice of the failure by Agouron to use reasonable  diligence in a timely manner
in the  development  and  Registration of a Product in the Field in the Licensed
Territory,  Agouron fails to fulfill its obligations under this Section 2.02(a),
or fails to commence  reasonable  efforts to fulfill such obligations,  JE shall
have the right,  as its sole and  exclusive  remedy for such  failure,  * in the
country  in which  reasonable  efforts  have not been  used  under  the terms of
Section 2.01 * to Agouron, its Affiliates and sublicensees.  The Parties,  under
such * , shall have the right  (with right of  sublicense)  to * in or into such
country a * JE Patent Rights and  Development  Program Patent Rights,  and using
applicable  JE  Technology  and  Development  Program  Technology.   If  Agouron
disagrees with JE's conclusion that Agouron has failed to fulfill its obligation
under this Section 2.02, or fails to commence reasonable efforts to fulfill such
obligations,  the Parties shall resolve such disagreement in accordance with the
dispute resolution procedures set forth in Section 7.03.

         (b) In the event that Agouron  elects to  discontinue  the  Development
Program in all  countries  of the Licensed  Territory,  JE, its  Affiliates  and
sublicensees  shall be free,  without  any further  action by JE or Agouron,  to
discover,  develop,  manufacture and/or  commercialize  Products on their own or
with  any  third  party.  In  the  event  of  Agouron's  discontinuation  of the
Development Program in all countries of the Licensed Territory,  neither Agouron
nor its Affiliates and sublicensees  shall have any right to use its Development
Program  Technology  to  discover,  develop,  manufacture  and/or  commercialize
Products.  In such event,  the licenses  granted to Agouron,  its Affiliates and
sublicensees  by the  provisions  of Section 2.01 to use,  offer for sale,  sell
and/or  import  Products in the Licensed  Territory  under  applicable JE Patent
Rights and Development Program Patent Rights, and using applicable JE Technology
and Development Program Technology, shall be terminated. Agouron, its Affiliates
and sublicensees  shall have the right to use Development  Program Technology it
developed or acquired before the  discontinuation of the Development  Program in
all countries in the Territory for uses other than the  discovery,  development,
manufacture and/or  commercialization of Products.  Additionally,  Agouron shall
transfer ownership to JE of any Dossiers for Products,  and shall cooperate with
JE to effect an orderly  transition of Agouron's  development  and  Registration
responsibilities to JE.

         SECTION 2.03 DILIGENT EFFORTS TO MARKET. The right of Agouron to market
a Product in a country  located in the  Licensed  Territory  shall be subject to
diligent   marketing  efforts  by  Agouron   commensurate  with  the  commercial
opportunity for such Product.  Agouron shall provide a reasonable level of sales
and other promotional  support for such Product in a country. 
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Marketing  efforts undertaken by Agouron's Affiliates and sublicensees shall
be attributed to Agouron. If, after receipt of a * written notice of the failure
by Agouron to provide the  agreed-upon  level of sales and other * for a Product
in a country  located in the  Licensed  Territory,  * to fulfill its  obligation
under this Section 2.03, or * to * reasonable  efforts to * obligations,  JE * ,
as the sole and  exclusive  remedy for such * , to * in such  country  under the
terms  of  Section  2.01   converted  to  *  to  Agouron,   its  Affiliates  and
sublicensees.  The Parties, under such * , shall * to *in or into such country a
Product under applicable JE Patent Rights and Development Program Patent Rights,
and using  applicable JE  Technology  and  Development  Program  Technology.  If
Agouron  disagrees with JE's  conclusion  that Agouron has failed to fulfill its
obligation under this Section 2.03, or fails to commence  reasonable  efforts to
fulfill  such  obligations,  the Parties  shall  resolve  such  disagreement  in
accordance  with the dispute  resolution  procedures  set forth in provisions of
Section 7.03.

          ARTICLE III - SHARING AND PROTECTION OF INTELLECTUAL PROPERTY

         SECTION 3.01      PATENTS.

         (a) * the most appropriate manner to prepare, file, prosecute, maintain
and extend  patent  applications  and issued  patents to protect the  commercial
interests of * in patent applications and issued patents included within the * ;
provided, however, that * to reasonably * on the most appropriate manner to file
and prosecute patents to protect the commercial  interests of * in the Compound,
intermediates thereof, or Products. * the patent applications and issued patents
included  within the JE Patent Rights and is  responsible  for all  preparation,
filing, prosecution, maintenance and extension of patent applications and issued
patents for the JE Patent Rights. * be responsible for all preparation,  filing,
prosecution, maintenance and extension expenses for the JE Patent Rights payable
to third parties (including  expenses for the preparation,  filing,  prosecution
and  maintenance  of  patent  term  restoration  applications  and  supplemental
protection  certificates).  * promptly advise * of the grant, lapse, revocation,
surrender,  invalidation, or abandonment of any JE Patent Rights anywhere in the
world.  *  acknowledges  that all rights,  titles and  interest in and to the JE
Patent Rights are * , subject to * under this Agreement.

         (b) Each Party  shall  endeavor  to patent  inventions  or  discoveries
arising  during the conduct of the  Development  Program if such  inventions  or
discoveries may reasonably be considered  patentable under the particular law of
the country in question  and, in the exercise of reasonable  business  judgment,
the  patenting of such  inventions  in such country may be considered to provide
meaningful  protection,  all in accordance  with the standards  employed by such
Party in its usual course of business. As long as a Party has rights to Compound
and/or Products hereunder,  the Parties agree, if feasible,  and if commercially
reasonable, to prepare, file, prosecute, maintain and extend patent applications
and patents included within the Development  Program Patent Rights in accordance
with * .

<PAGE>

         (c) Any patent applications and patents included within the Development
Program Patent Rights covering  inventions jointly made by the employees of more
than one Party ("Jointly Invented  Development  Program Patent Rights") shall be
jointly assigned to the employers of such inventing  employees.  Any Development
Program  Patent  Rights  covering  inventions  solely made by the employees of a
single Party ("Separately  Invented Development Program Patent Rights") shall be
assigned to the  employer  of such  inventing  employees.  Subject to the rights
given the other Party, an assignee of Development Program Patent Rights shall be
entitled to * such assignee by operation of law; * to utilize Development
Program Patent Rights that have been assigned to * are set forth elsewhere in 
this Agreement.

         (d) *  Separately  Invented  Development  Program  Patent  Rights shall
determine the most appropriate manner to prepare, file, prosecute,  maintain and
extend  patent  applications  and  issued  patents  to  protect  the  commercial
interests of the Parties in the Separately  Invented  Development Program Patent
Rights; provided, however, that *
                 Separately Invented Development Program Patent Rights agrees to
reasonably  consult with the other Party on the most appropriate  manner to file
and prosecute patents to protect the commercial interests of the Parties in such
Separately  Invented  Development  Program Patent Rights. * Separately  Invented
Development  Program  Patent Rights shall be  responsible  for all  preparation,
filing,  prosecution,  maintenance  and  extension  expenses for the  Separately
Invented  Development  Program Patent Rights payable to third parties (including
expenses for the preparation, filing, prosecution and maintenance of patent term
restoration applications and supplemental protection certificates).

         (e) *  Jointly  Invented  Development  Program  Patent  Rights  shall *
determine the most appropriate manner to prepare, file, prosecute,  maintain and
extend  patent  applications  and  issued  patents  to  protect  the  commercial
interests  of the Parties in the Jointly  Invented  Development  Program  Patent
Rights.  *  shall  *  the  preparation,  filing,  prosecution,  maintenance  and
extension  expenses for all Jointly Invented  Development  Program Patent Rights
payable  to third  parties  (including  expenses  for the  preparation,  filing,
prosecution  and  maintenance  of  patent  term  restoration   applications  and
supplemental protection  certificates,  but excluding any travel expenses of the
Parties, which shall be borne by the Party incurring such expenses);  each Party
shall pay its share of such expenses  within * from the date of its receipt of a
proper invoice for such expenses.

       (f) Notwithstanding the preceding, if * its diligent efforts, in a timely
manner, in the preparation,  filing,  prosecution,  maintenance and extension of
such  patent  applications  and  issued  patents,  *  the  preparation,  filing,
prosecution,  maintenance and extension of such patent  applications  and issued
patents,  shall  *  such  preparation,  filing,  prosecution,   maintenance  and
extension activities for such patent applications and/or patents included within
the Development Program Patent Rights.

         (g) Upon * written  notice,  a Party may elect to  abandon  any  patent
applications and/or terminate its obligations to pay or share in the expenses of
preparing,   filing,   

<PAGE>

prosecuting,  maintaining  and/or  extending  a patent  application  and/or
issued patent by notifying the other Party of such election. Notwithstanding any
other  provision of this  Agreement,  after the effective date of such election,
the Party  electing  to abandon or  terminate  its  obligations  for such patent
application and/or patent shall not be responsible for the above-noted  expenses
that are incurred after the effective date of such election, and shall be deemed
to have  transferred  and assigned to the other Party all of its  ownership  and
license rights under such patent application and/or patent.  Additionally,  if *
its  obligation to * on a patent  application  and/or issued patent * , then any
claims included within such patent  application and/or patent shall be deemed to
not be a Valid Claim.  The electing  Party and its employees  shall  continue to
reasonably  assist  the other  Party in the  preparation,  filing,  prosecution,
maintenance and/or extension of such patent application and/or patent.

     (h)  Representatives  of Agouron and JE shall meet * (or * if necessary) to
review and discuss the actions  taken or to be taken by each of the Parties in *
interests of the Parties in the Development Program Patent Rights. Such meetings
may be conducted in person or by means of telephone conference calls. Each Party
shall * in such  meetings.  Prior to or  immediately  after  the  filing  of the
initial patent application for an invention,  the filing Party shall provide the
authorized  representatives of the other Party with an English-language  version
of the patent application for * . If requested by a non-filing Party, the filing
Party shall also provide such  non-filing  Party with a full copy of each patent
application  actually  filed  in  English  and in the  language  in which it was
originally filed. It is the intent of the Parties that any patent issuing to the
Parties hereunder shall be *

     not subject to this  Agreement.  Each of the Parties shall * prepare a list
that  reflects,  to the  best  of  its  knowledge,  the  current  status  of any
Development Program Patent Rights for which it controls the preparation, filing,
prosecution,  maintenance and/or extension of the patent applications and issued
patents, which list shall be submitted to the other Party * after * . JE shall *
prepare a list that reflects,  to the best of its knowledge,  the current status
of the JE Patent Rights. The Parties, if they so elect,* .

         (i) Each of the Parties agrees to provide all required  information and
to reasonably  assist the other Party in the preparation,  filing,  prosecution,
maintenance  and extension of patent  applications  and issued patents  included
within the Patent  Rights,  and for patent  term  restoration  applications  and
supplemental protection certificates for the Patent Rights.

         (j) Unless  otherwise  agreed,  each of the Parties shall require their
respective  employees  to: (i) assign all of their rights and ownership in joint
inventions that are included  within the Jointly  Invented  Development  Program
Patent  Rights  jointly  to  the  employers  of  the  inventing  employees  (or,
alternatively,  require  such  employees  to  assign  all of  their  rights  and
ownership in such joint inventions to their employer for reassignment jointly to
the  employers of the  inventing  employees);  and (ii) assist  without  further
compensation  (except for reimbursement for reasonable and necessary expenses) a
requesting  Party in preparing and  prosecuting  the patent  application on such
joint  inventions  throughout the Territory,  and in transferring  rights to the

<PAGE>

employers of the  inventing  employees  (including  executing  documents) to the
patents and patent applications for such joint inventions.

         (k) Each Party shall  promptly  notify the other Party of its knowledge
of any potential infringement of the Patent Rights by a third party. The Parties
agree to cooperate in taking  commercially  reasonable  legal actions to protect
the commercial interests of the Parties in the Compound,  intermediates  thereof
or Products against  infringement by third parties.  If, within three (3) months
following  receipt of  written  notice  requesting  a Party join in an action to
protect against such infringement by third parties, a Party fails to participate
in such  commercially  reasonable  action by the other  Party to halt an alleged
infringement,  the other Party shall, in its sole discretion,  have the right to
take such action in such country as it deems warranted in its own name and/or in
the  name of the  other  Party;  the  Party  maintaining  such  action  shall be
responsible  for the costs of  maintaining  the action and shall be  entitled to
receive all damages recovered from the action for the past infringement. If both
Parties  wish to  participate  in taking  action  to  protect  their  commercial
interests  in  the   Compound,   intermediates   thereof  or  Products   against
infringement,  then Agouron shall control such action in the Licensed  Territory
and JE shall control such action in the JE Territory.  The costs of  maintaining
such action shall be shared  equally by the Parties,  and the damages  recovered
from such  action for the past  infringement  shall be divided as  follows:  (i)
first, pro rata between JE and Agouron in an amount sufficient to reimburse each
them for their expenses incurred in such prosecution; *
thereafter,  between JE and Agouron based on good-faith  negotiations  regarding
how to apportion any remaining damage recovery. Each Party agrees to render such
reasonable assistance as the prosecuting Party may request.

     (l)  Agouron  agrees to notify JE at *  initially  * any JE  Technology  or
Compound in * any country in the Territory,  to allow JE time to make any patent
filings or to take any other actions  necessary to protect the JE Patent Rights,
JE Technology or Compound.

     SECTION 3.02  INFRINGEMENT  OF PATENTS OF THIRD  PARTIES.  Each Party,  its
Affiliates and sublicensees, and their respective employees and agents shall use
diligent  efforts to avoid  known  infringement  of patents of any third party *
and/or Products.  However,  a Party, its Affiliates and sublicensees,  and their
respective  employees  and * and their  respective  employees  and agents if the
practice  of the  Patent  Rights,  JE  Technology,  and/or  Development  Program
Technology in discovering,  developing,  manufacturing  or  commercializing  the
Compound, intermediates thereof and/or Products infringe any patent of any third
party.  If a Party  becomes  aware of any claim or suit by any  third  party for
infringement  of a  patent  of such  third  party  in  connection  with * of the
Compound,  intermediates  thereof and/or Products by a Party hereto,  such Party
shall  notify  the  other  Party  in  writing  of such  claim  or suit  within *
thereafter.  Each Party agrees to render such reasonable assistance as the other
Party may  request in  defending  any such claim or suit.  The  Parties* 


<PAGE>

of any  existing  or  potential  infringement  claim or action  that  would
require the * to a third party, except that if the Parties cannot promptly reach
agreement,  they shall appoint an independent patent counsel to give an opinion,
* the Parties,  as to whether there is a substantial  risk that the  third-party
patent  is  both  valid  and  infringed.  If the  opinion  is  that  there  is a
substantial  risk  that the  patent  is both  valid  and  infringed,  the  Party
marketing a Product in a country,  after consultation with the other Party, * as
it . Unless the Parties agree otherwise,*

     provided,  however, that in no case shall * with respect to a Product for a
country in a * be reduced * with  respect to such  Product  for such  country in
such *  period.  Any  remaining  *  amount  may be used as  described  above  in
subsequent * periods to * with respect to such Product for such country. Agouron
acknowledges  that  it  is  aware  of a  Cooperative  Research  and  Development
Agreement  between  JE and the *  (hereinafter  referred  to as "* ),  which was
originally   entered  into  in  September   1993  and  amended  in  March  1996.
Notwithstanding  the preceding* under the terms of the * , and for obtaining any
consent  required by the * for this  issuance of the  licenses  granted  Agouron
under the provisions of Section 2.01.  Agouron shall be entitled to * on account
of *

     SECTION 3.03 TRADEMARKS. A Party, its Affiliates and sublicensees,  if any,
* any trademark  office in the Territory any Trademark for use with Products for
which it holds license  rights to make, use and/or sell hereunder * Such Party *
, title  and  interest  in and to the  Trademark  in its own name or that of its
designated  Affiliate or sublicensee,  if any, during and after the term of this
Agreement.  If required by the laws of a specific country,  the Party owning the
Trademark  shall assist the other Party in  qualifying  as a registered  user of
such Trademark in such country. The Party owning a Trademark *

The  Parties  shall not use a  Trademark  used in  marketing  of Products in the
Territory   for  marketing   other   commercial   products  in  the   Territory.
Additionally,  the Parties agree to cooperate in  reasonable  efforts to protect
the  rights  of  the  Parties  in a  Trademark,  including  notification  of any
infringement which may come to a Party's attention, and the proper execution and
filing of appropriate registered user documents. *

Details  regarding the license  provisions of the Trademark  license  granted in
Article II, including  quality and  specifications  of Product,  shall be agreed
upon by the Parties and later attached as Attachment 1 to this Agreement.

         SECTION 3.04  INFORMATION  EXCHANGe.  Upon  execution of this Agreement
and, thereafter,  on an ongoing basis during the Development Program, each Party
shall  disclose  to the  other  Party in  confidence,  subject  to the  terms of
Sections 3.05 hereof, *

<PAGE>

     , as such items specifically relates to the Compound, intermediates thereof
or Products and are necessary or useful for the  development or  Registration of
Compound  and/or  Product,  including  the  JE  Patent  Rights,  JE  Technology,
Development Program Patent Rights and Development Program Technology; each Party
shall  provide  technical  assistance to the other Party to enable it to utilize
such information.  Notwithstanding the foregoing, a Party shall not be obligated
to  disclose  to the other  Party any  information  that it is  prohibited  from
disclosing to the other Party, either by reason of a contract with a third party
or by law. In the event of such a restriction, the Parties shall *
disclosure to be made.

         SECTION 3.05  CONFIDENTIALITY.  Except as otherwise expressly specified
in this  Agreement  and except for the proper  exercise  of any  license  rights
granted or rights reserved under this Agreement,  JE and Agouron shall each keep
in  confidence  and shall  each use its best  efforts  to cause  its  respective
Affiliates,   employees,  directors,  agents,  consultants,   clinical  research
associates, outside contractors, clinical investigators and sublicensees to whom
it is permitted to disclose  information pursuant to the terms of this Agreement
to retain in confidence  all  confidential  and  proprietary  information of the
other Party,  including the Patent Rights,  JE Technology,  Development  Program
Technology,   information  and  materials  exchanged  under  the  terms  of  the
Confidentiality  Agreement  and the  Material  Transfer  Agreement  between  the
Parties which were both originally entered into on December 22, 1997, accounting
and financial  information and/or the marketing and business plans of such other
Party that is disclosed to it hereunder.  Without limiting the foregoing, JE and
Agouron  shall each  exercise the same degree of diligence and care with respect
to the  above-described  information  as it exercises  with respect to its other
proprietary  information.  Each  Party  represents  to the other  Party  that it
maintains   policies  and  procedures   designed  to  prevent  the  unauthorized
disclosure of its proprietary  data and  information.  Each Party further agrees
that  it  shall  limit  dissemination  of and  access  to the  confidential  and
proprietary  information of the other Party within its  organization to those of
its and its Affiliates'  personnel who have a need to know the  information.  JE
and Agouron shall each be entitled to disclose the  above-described  information
to  its  consultants,   clinical  research   associates,   outside  contractors,
collaborators, clinical investigators and other third parties who are subject to
confidentiality  and use  obligations  equivalent  to  those  applicable  to the
disclosing  Party  hereunder,  and to  governmental or other  regulatory  and/or
health authorities,  to the extent that such disclosure is reasonably  necessary
to obtain  patents,  to obtain  authorization  or to conduct  clinical trials on
Compound or Products,  to prepare the Dossier,  and/or  otherwise to fulfill its
obligations  pursuant  to this  Agreement.  Each  Party  shall have the right to
disclose  Development  Program  Technology  to persons it proposes to enter into
business  relationships  with,  if such  persons are subject to  confidentiality
obligations  equivalent to those  applicable to the disclosing  Party hereunder.
The preceding  obligations of confidentiality  shall be waived as to information
that the Party claiming waiver can demonstrate,  based on written  records:  (i)
was in the public  domain at the time of disclosure  hereunder;  (ii) comes into
the public domain through no fault of the Party claiming waiver; (iii) was known
to the Party  claiming  waiver  prior to its  disclosure  under this  Agreement,
unless such  information  was  obtained  from the other Party on a  confidential
basis;  (iv) is  disclosed  on a  non-confidential  basis to the Party  claiming
waiver  by a third  party  having a lawful  right to make such  disclosure  on a
non-confidential  basis; (v) is published with the prior mutual agreement of the
Parties,  after having given  consideration to 

<PAGE>

appropriate  commercial factors;  (vi) comes into the public domain through
governmental  publication  of a patent  application;  or (vii) is required to be
disclosed  to file a patent or other  regulatory  application  or to comply with
applicable laws and regulations.  The obligations  under this Section 3.05 shall
survive  to the later of: (i) ten (10)  years  after the end of the  Development
Program; or (ii) the termination or expiration date of the last to expire of any
license(s)  granted  pursuant to this  Agreement,  to the extent the Development
Program  Technology  or JE  Technology  is  applicable to the practice of grants
under such license(s); or (iii) the expiration date of the last to expire of any
patent(s)  within the Patent Rights on a Product.  The Parties  acknowledge  and
agree  that the  Parties'  rights  and  obligations  under  the  Confidentiality
Agreement  and the Material  Transfer  Agreement  between the Parties which were
both originally  entered into on December 22, 1997 are hereby  superseded by the
provisions of this Section 3.05.

     SECTION 3.06 PUBLICATION. JE and Agouron each acknowledges the interests of
the other  Party in  publishing  certain of the results of its  development  and
Registration of a Product to obtain recognition within the scientific  community
and to advance the state of  scientific  knowledge.  The Parties also  recognize
their  mutual  interests in obtaining  valid  patent  protection  for their drug
products.  Consequently, a Party, its employees or consultants wishing to make a
publication  shall  provide  the other Party the  opportunity  to review a draft
manuscript at least * to the date of the intended  submission for publication (*
period as the Parties agree upon in light of the  availability  of clinical data
or other data to be described in the proposed  publication)  and, upon the other
Party's written request, shall delay submission for a period (not greater than *
from the date of such written  request)  sufficient to provide for the filing of
appropriate patent application(s) for any patentable subject matter disclosed in
such  publication.  Furthermore,  in  acknowledgment  that  certain  Development
Program Technology, while not of a patentable subject matter, could be necessary
to protect the commercial  interests of the Parties, the Parties agree that each
Party  shall  review in a timely  manner (not  greater  than * , in light of the
availability  of clinical  data or other data to be  described  in the  proposed
publication,  from  the  date  of a  written  request  to  such  Party)  a draft
manuscript,  and  propose  the  conditions  under  which  the  portion  of  such
technology  disclosed in the draft manuscript that could be necessary to protect
the  commercial  interests of the Parties can be  published.  If the other Party
does not  object  to the  publication  within  * from  the date of such  written
request, the requesting Party (subject to the other Party's right to request the
*  delay  described  above  for  patentable  subject  matter  disclosed  in such
publication) shall be free to publish such manuscript. If a Party objects to the
publication  of a portion of the draft  manuscript,  such Party  shall  indicate
specifically  what   modifications  to  the  draft  manuscript  it  believes  is
appropriate to protect the  commercial  interests of the Parties and the reasons
therefor.  After  giving  reasonable  consideration  to the  suggestions  of the
objecting  Party,  the Party wishing to make a publication  shall have the final
authority to determine the scope,  timing and content of the  publication.  Each
Party will use * inform the other Party about proposed oral presentations  which
such  Party  intends  to  make,  if it will  be  disclosing  new  scientifically
significant data concerning Product at such oral presentation.
<PAGE>

            ARTICLE IV - DEVELOPMENT AND COMMERCIALIZATION STRUCTURE

         SECTION 4.01 COORDINATION. Coordination of the Parties' development and
commercialization  efforts for Compound  and Products in the Licensed  Territory
shall be carried out as specified in Sections 4.02 and 4.03.

         SECTION  4.02   DEVELOPMENT  AND   REGISTRATION;   Responsibility   for
Development  Costs.  JE  and  Agouron  acknowledge  their  mutual  intention  to
cooperate  in a  commercially  reasonable  manner in the timely  development  of
Compound and Products in the Territory.  The Parties further  acknowledge  their
mutual  willingness  to  discuss  ad hoc  agreements  to  establish  appropriate
mechanisms for such cooperation. Recognizing the importance of timely initiation
of development activities,  however, JE and Agouron agree to the following basic
approach to development of Compound and Products in the Licensed Territory,  and
to the conduct and funding of their respective development activities.

         (a) A development plan prepared by Agouron listing the major activities
to be conducted under the Development Program for the Registration of Product in
the Field in the Licensed Territory during such period,  including the timelines
for pre-clinical  tests,  clinical trials, and any other procedures  required to
obtain such  Registration,  shall be set forth in Exhibit 1. After the execution
of this  Agreement,  Agouron  shall be  responsible  for the design,  update and
implementation  of the Development  Program that is undertaken by Agouron and JE
to accomplish the development plan. All costs for such  implementation  shall be
borne by Agouron.

         (b) The  Parties  acknowledge  that it will be  necessary  to amend and
update the  Development  Program as  additional  information  becomes  available
concerning  the  prerequisites  necessary  for  Registration  of  Product in the
Licensed  Territory.  Agouron shall have the right to amend,  from time to time,
the Development Program.  Agouron shall advise JE in writing with respect to any
change in the  Development  Program that may cause a delay of five (5) months or
more in any of the basic  milestones  thereunder or which consists of a material
change in the clinical  protocols.  In addition,  any change in the  Development
Program that materially affects the then-existing  Compound Supply Plan shall be
subject to the mutual agreement of JE and Agouron.

         (c) As soon as possible  after the  execution  of this  Agreement,  the
Parties shall  promptly  reach  agreement on the basic terms under which JE will
manufacture and supply Compound to Agouron,  its Affiliates and sublicensees for
use in development  and  registration  activities for Compound  and/or  Product,
including the amounts and timing of deliveries of Compound (the "Compound Supply
Plan"); the Compound Supply Plan, when agreed upon, will be incorporated as part
of the Development Program.

         (d) Agouron shall be responsible for conducting and paying the costs of
any studies that involve  Products,  and which Agouron  pursues for the Licensed
Territory  (including  Phase IV  studies  and any  studies  required  to achieve
Registration  of a Product in the Licensed  Territory).  Agouron  shall have the
responsibility,  in its sole discretion, for determining the magnitude and scope
of any Phase IV studies to be conducted  utilizing  such Product in the Licensed
Territory.  Except as provided in Section 4.02(h),  Agouron shall be responsible
for the costs of regulatory 

<PAGE>

applications  and  subsequent   amendments  thereto  and  fees  payable  to
regulatory  agencies  required  for the  commercialization  of  Products  in the
Licensed Territory.

         (e) Agouron,  at its own cost,  shall be responsible  for submission of
Dossiers for a Product to the regulatory  authorities in the Licensed  Territory
in  pursuit  of  approvals  to sell  such  Product  and shall  have the  primary
responsibility  in the  countries  of the  Licensed  Territory  for the  ongoing
correspondence  and  interaction  before and after  Registration of such Product
with the respective regulatory  authorities.  Agouron, at its own cost, shall be
responsible  for initially  obtaining and  amending,  if required,  all required
approvals  from  the  regulatory  authorities  in  the  Licensed  Territory  for
importing, distributing and selling a Product, including negotiating pricing and
reimbursement  for a Product with the  regulatory  authorities of the individual
countries  of the Licensed  Territory.  All Dossiers for Product in the Licensed
Territory shall be owned by and be in the name of Agouron.

         (f)  JE  shall   cooperate  with  Agouron  to  furnish  data  or  other
information  JE has access to that is related to  Compound  and/or  Product,  to
enable  Agouron,  at  Agouron's  expense,  to Register a Product in the Licensed
Territory. JE agrees to execute such documents as Agouron may reasonably request
in connection with such Product Registrations.

         (g) JE will be  responsible  for the  cost  and  implementation  of all
clinical  studies  that JE,  in its sole  discretion,  pursues  to  support  its
development and Registration of Products in the JE Territory.

         (h) JE shall be responsible for obtaining,  in its name and at its cost
and expense,  all necessary  governmental  approvals required to manufacture and
deliver Compound to Agouron. JE shall file and maintain the drug master file for
Compound with the FDA.

         (i) To the extent required to support  Registrations of a Product (such
as for Investigational New Drug Applications and New Drug Applications), Agouron
shall have reference rights to use the safety,  manufacturing  and other data in
such drug master file.  Each Party shall be entitled to have the  government  or
health authorities  cross-reference the information contained in any Dossier for
a Product filed in any country in the  Territory,  as may be necessary to obtain
and  maintain  the  Registration  on a  Product  in  any  other  country  in the
Territory.

         (j) Each Party agrees to use its diligent  efforts in  responding  in a
timely  manner,  but not more than thirty (30) days,  to requests from the other
Party for preclinical and clinical results and other information  concerning the
Development  Program to enable  the other  Party to comply  with the  regulatory
requirements for the Development  Program.  To the extent possible,  the Parties
shall develop and use compatible  reporting forms in the clinical  studies aimed
at achieving  Registration  of Products.  A Party  conducting a study  involving
Product shall assist the other Party with incorporating the data from such study
into their Dossiers, if necessary.

         (k) Agouron  shall keep JE informed of its progress in the  development
and Registration of Products.  This information exchange shall include, at least
two (2)  times per year,  regular  meetings  of the  Parties,  and such  written
progress  reports  as are  agreed to by the 

<PAGE>

Parties that summarize  Agouron's  activities  during each reporting period
and  Agouron's  planned  activities  for the  succeeding  period.  JE shall keep
Agouron  informed of its development and  Registration  activities for Products,
including any  significant  planned  activities  for the succeeding one (1) year
period.  The location for such meetings shall be at either Party's facilities or
such other sites agreed to by the  Parties.  Meeting  minutes  shall be promptly
prepared and approved by the designated  representatives of each of the Parties.
Each Party shall pay all of its respective  expenses for such meetings.  Each of
the Parties shall assign a representative to facilitate  communications  between
the  Parties;  each  representative  shall report to his/her  management  on the
matters discussed at each of the meetings of the Parties.  Each Party,  prior to
its  implementation  of a preclinical or clinical study involving a Product that
could have a material impact on the commercial  potential of such Product in the
other Party's marketing territories, shall use its reasonable efforts to provide
the  other  Party  with a copy of the  draft  protocol  for such  study,  and an
opportunity,  in a timely manner, but not more than thirty (30) days, to comment
on the purpose and proposed design and  implementation of such study. Each Party
shall provide the other Party with access to its relevant records and facilities
to  permit a  reasonable  review  of the  progress,  from  time to time,  of its
development and Registration  activities.  Each Party agrees to use its diligent
efforts in responding in a timely manner, but not more than thirty (30) days, to
requests from the other Party for  information  concerning the  development  and
Registration of Products.

         (l) JE and Agouron shall each use qualified  persons in the development
activities of the Development Program.

         (m) All  work  in  connection  with  the  development  of  Compound  or
Products,  to the extent required by applicable  laws or  regulations,  shall be
conducted in  accordance  with Good  Laboratory  Practices,  Good  Manufacturing
Practices  and Good  Clinical  Practices,  as such rules of practice are amended
from time to time. Each Party in the conduct of its activities shall comply with
all  applicable  laws,  rules and  regulations of each  jurisdiction  within the
Territory  that  are  applicable  to  the  development,   testing,  manufacture,
labeling,  packaging,  storage,  marketing,  distribution,  sale,  promotion and
import or export of Product.

         (n) If a Party is conducting a pre-clinical  study in a country located
in the other Party's marketing  territory,  the Party conducting the study shall
use its best efforts to avoid interfering with such other Party's  activities in
such country.

         SECTION 4.03 MARKETING.  Agouron shall be responsible for the marketing
of Products in the Licensed  Territory.  JE and Agouron  agree to the  following
basic  approach to the marketing of Products in the Licensed  Territory,  and to
the  conduct  of  their  marketing  activities  in  their  respective  marketing
territories.

         (a)  Agouron  shall  be   responsible   for  the  design,   update  and
implementation of the marketing programs and distribution and sale of Product in
the Licensed Territory, including the development and selection of the marketing
plan for a Product and the  promotional  messages and overall  positioning for a
Product in any countries located in the Licensed  Territory.  All costs for such
implementation shall be borne by Agouron. Agouron shall have the right to amend,
from time to time, its marketing programs.
<PAGE>


         (b) The promotional messages and overall positioning for a Product that
JE shall use in its marketing  programs in the JE Territory  shall be consistent
with a Product's marketing plan developed by Agouron for the Licensed Territory.
JE shall  modify the  positioning  and messages  only to the extent  required to
respond to country-specific needs.

         (c) Agouron  shall keep JE informed  of  Agouron's  current and planned
marketing activities in the Licensed Territory.  This information exchange shall
take place by means of  semi-annual  meetings of the  Parties,  and such written
progress  reports  as are  agreed to by the  Parties  that  summarize  Agouron's
activities  during a semi-annual  period and Agouron's  planned  activities  for
Products for the succeeding  semi-annual  period. JE shall keep Agouron informed
of JE's marketing activities in the JE Territory.  The location of such meetings
shall be at either of the Party's  facilities  or other  sites  agreed to by the
Parties.  Meeting  minutes  shall  be  promptly  prepared  and  approved  by the
designated representatives of each of the Parties. Each of the Parties shall pay
all of its  respective  expenses for such  meetings.  Each of the Parties  shall
assign a representative to facilitate  communications  between the Parties; each
representative  shall report to his/her  management on the matters  discussed at
the meetings of the Parties. At the meetings of the Parties, the representatives
of the Parties shall review and discuss the  consistency of Agouron's  marketing
plans for a Product in the Licensed Territory with JE's marketing plans for such
Product  in the JE  Territory,  and the  conduct  of  additional  marketing  and
post-Registration  clinical studies for a Product that are not conducted as part
of the Development  Program;  the conduct and funding of clinical  studies for a
Product that are conducted as part of the Development  Program shall be governed
by the provisions of Section 4.02.

         (d) Unless prohibited by law or regulation,  the labeling for a Product
in the  countries  in the  Licensed  Territory  shall state that such Product is
licensed from JE. To the extent  required to comply with the  provisions of this
Section 4.03(d),  each Party grants to the other Party the right to use its name
and logos in the labeling for a Product.

         (e) In accordance  with the provisions of the license rights granted in
Article  II,  Agouron  may,  without  charge,  market a Product in the  Licensed
Territory  using JE's  Trademarks  and Trade Dress or may use its own Trademarks
and  Trade  Dress,  and JE may,  without  charge,  market  a  Product  in the JE
Territory  using  Agouron's  Trademarks  and  Trade  Dress  or may  use  its own
Trademarks and Trade Dress.

         (f) Agouron and JE shall each use  qualified  persons in its  marketing
activities for a Product in its respective marketing territories.

         (g) Agouron shall be responsible for responding, in a timely manner, to
inquiries,  and for reporting  adverse drug reactions  related to a Product in a
country located in the Licensed  Territory.  Notwithstanding  Agouron's ultimate
responsibility  for the professional  services and the health and/or  regulatory
authorities'  communications  related to a Product  in a country  located in the
Licensed Territory,  to the extent reasonably possible,  JE shall have the right
to review,  comment and  participate in  communications  concerning such Product
with the health and/or  regulatory  authorities  in such  country.  Furthermore,
Agouron and JE shall each be entitled to respond to routine medical questions or
inquiries directed to them. Each Party shall use its best 

<PAGE>

efforts to provide  the other  Party with all  information  (other than any
proprietary  information  not related to such Product)  reasonably  necessary to
respond  properly and promptly to any such  questions or inquiries;  the Parties
shall also use their best efforts to keep such information  current. The Parties
shall confer with respect to responding to anticipated  inquiries and questions.
Each Party shall use its best  efforts to promptly  provide the other Party with
new information,  scientific  findings,  and summaries of regulatory or judicial
requests specifically related to a Product, to the extent that such information,
findings  or  requests  are  likely  to have a  significant  impact on the other
Party's marketing of such Product.

         (h) Each Party, its Affiliates and sublicensees,  agrees throughout the
duration of this  Agreement to notify the other Party  immediately in English of
any  information  concerning  any serious or  unexpected  side  effect,  injury,
toxicity or sensitivity reaction, or any unexpected incidents,  and the severity
thereof, associated with the clinical uses, studies,  investigations,  tests and
marketing of a Product,  whether  determined or not to be  attributable  to such
Product.  "Serious,"  as used in this Section  4.03(h),  refers to an experience
which  is  life-threatening  or  results  in  death,  permanent  or  substantial
disability,  in-patient  hospitalization or prolongation of hospitalization,  or
produces  a  congenital  anomaly or  cancer,  or is the  result of an  overdose.
"Unexpected," as used in this Section 4.03(h) for a non-marketed Product, is one
that is not identified in nature, severity, or frequency in the current clinical
investigator's confidential information brochure.  "Unexpected," as used in this
Section 4.03(h) for a marketed Product, is one that is not listed in the current
labeling for such Product and includes an event that may be symptomatically  and
pathophysiologically related to an event listed in the labeling but differs from
the event because of increased frequency, greater severity or specificity.  Each
Party shall cooperate with the other to resolve complaints received by the other
Party with respect to any Product.  Without  limiting the foregoing,  each Party
agrees to notify the other Party of any severe, serious,  alarming or unexpected
complaints that they receive,  whether or not determined to be attributable to a
Product, by telephone within twenty-four (24) hours, and in writing within three
(3) business days of receipt of the  complaint.  All other  complaints  shall be
forwarded by a Party to the other Party within  thirty (30) calendar days of its
receipt of the complaint.

         (i) Each Party further agrees to immediately  notify the other Party of
any  information  that such  Party,  its  Affiliates  or  sublicensees  receives
regarding any  threatened or pending  action by a  governmental  agency that may
affect the safety and efficacy claims of a Product or the continued  development
or marketing of a Product.  Upon  receipt of any such  information,  the Parties
shall  consult  with each other in an effort to arrive at a mutually  acceptable
procedure  for  taking  appropriate  action;  provided,  however,  that  nothing
contained herein shall be construed as restricting  either Party's right to make
a timely report of such matter to any  government  agency,  or take other action
that it deems to be appropriate or required by applicable law or regulation. The
information to be provided hereunder shall be provided in English.

         (j) Without  limiting the foregoing,  it is also  understood  that each
Party may  notify  its  Affiliates  or  sublicensees  of any  incident  or event
reported by the other Party under this Section 4.03.

         SECTION  4.04  SUPPLY  OF  COMPOUND.  It  is  anticipated  that  timely
development  of  Compound  and/or a Product  will  require  the  manufacture  of
significant   amounts   of  the  

<PAGE>

Compound, and that successful worldwide commercialization of a Product will
require annual production of large quantities of the Compound.

         (a) In accordance  with the  provisions of Section 4.04,  Agouron shall
purchase  from  JE,  and  JE  shall  timely  deliver  Compound  for  use  in the
development and Registration  activities for Compound and/or Product,  including
using Compound to make Product to be used in clinical studies and trials and for
special license sales. JE shall provide Agouron, * , in accordance with Compound
Supply  Plan,  not  more  than * of  Compound  to be  used in  implementing  the
Development  Program,  provided  that the total daily dose per patient  does not
exceed * of Compound; if such daily dose exceeds *
      of  Compound  per  patient,  then the amount to be provided by JE shall be
increased  by the amount (not to exceed,  in the  aggregate,  * ) necessary  for
Agouron to implement  the  Development  Program.  JE shall * Agouron  additional
Compound for use in implementing  the  Development  Program at * such Compound *
"FBMCC" or "Fully  Burdened  Manufacturing  Cost of Compound"  means the cost of
Compound  shipped,  and shall include the direct and indirect costs of procuring
and/or producing  Compound shipped in accordance with either generally  accepted
accounting  principles or the  equivalent  international  accounting  standards.
Direct costs shall include  direct labor  (including  fringe  benefits),  direct
materials  (including taxes and duties) and third-party  contract costs required
to manufacture the bulk product  Compound (or related  intermediates).  Indirect
costs (to be allocated  to the  production  effort)  shall  include,  but not be
limited to, items treated as  "manufacturing  overhead,"  such as indirect labor
and materials, fringe benefits,  occupancy costs (including electricity,  water,
waste disposal,  other utilities and property taxes),  depreciation of property,
plant and equipment used in the manufacturing  process and other costs allocable
to the manufacturing process. Overhead shall not include start-up costs, or idle
or  excess  capacity  charges.  Included  in  the  cost  of  Compound  shall  be
manufacturing   variances,   including  inventory  reserves  and  non-conforming
production  runs. In the event Agouron intends to use a chemical  compound other
than JE-2147 for use in the development and registration activities for Compound
and/or  Product,  Agouron  shall  timely  consult  with JE with  respect to such
intentions.  In the event the Parties mutually agree to utilize such alternative
chemical compound and JE agrees to be the supplier of such alternative  chemical
compound  to  Agouron,  then the  Parties  will  determine  supply  arrangements
therefore in accordance  with the general terms and  conditions set forth herein
for the  supply  of  Compound  *, of * the  amount  referred  to  above  of such
alternative  chemical  compound  to be  used  in  implementing  the  Development
Program;  provided,  however,  that,  if  Agouron  elects to  develop a chemical
compound other than JE-2147,  Agouron shall * , if any, of the cost of providing
Agouron's  requirements  of  such  alternative  chemical  compound  for  use  in
implementing  the Development  Program,  * in supplying  Agouron with the amount
referred to above of JE-2147.

         (b) In accordance  with the  provisions of Section 4.04,  Agouron shall
purchase  from JE, and JE shall  timely  deliver  Compound for use in making the
finished  dosage form(s) of Product to be sold in the Licensed  Territory,  at a
price which equals * and/or * such Compound, * of *
<PAGE>

         (c) JE shall  maintain  books of  account  and  complete  and  accurate
records of all of its FBMCC of  procuring  and/or  producing  such  Compound  in
sufficient  detail to permit  Agouron to confirm  the  correctness  of such cost
items.  JE shall  provide  Agouron,  upon  reasonable  request,  with  copies of
invoices supporting third-party expenditures for procuring and/or producing such
Compound.  If Agouron reasonably  believes that an audit of FBMCC is appropriate
after reviewing the information  received from JE, Agouron shall have the right,
by an  independent  accounting  firm  reasonably  acceptable to JE,  employed by
Agouron and at Agouron's own expense, to examine the pertinent books and records
of JE at all  reasonable  times (but not more often than * ) for the  purpose of
determining  and reporting on the  correctness of FBMCC reported to Agouron;  it
being  understood  that such  examination,  with  respect to any audit for a * ,
shall not  commence  later than *  following  the end of such * . If an error is
found in the  amount  of  FBMCC  which is more  than * of the  amount  initially
reported to Agouron,  then JE shall reimburse Agouron for the reasonable cost of
such audit.

         (d) If,  JE  notifies  Agouron  that it is  unable  to  timely  deliver
Compound  ordered by Agouron in accordance  with the  provisions of this Section
4.04(d),  or JE fails to  timely  deliver * of  aggregate  Compound  ordered  by
Agouron in accordance  with the provisions of this Section  4.04(d) during any *
period,  and  such  Compound  was  ordered  by  Agouron  in a timely  manner  in
accordance  with the  forecasting  and  ordering  procedures  agreed upon by the
Parties,  then JE  agrees  * to make or have  made an  adequate  commercial
supply of Compound needed to fulfill its  requirements of Compound to be used in
making   Product  for  sale  or   distribution   in  the   Licensed   Territory.
Notwithstanding the preceding, it is agreed and understood that if JE is able to
supply a portion,  but not all,  of  Agouron's  requirements  for  Compound in a
timely manner, then the parties shall * the amount of Compound which Agouron * ,
and/or * , to fully satisfy its requirements for Compound; at a minimum, Agouron
shall be entitled to make or have made,  for a commercially  reasonable  minimum
period, a commercially  reasonable minimum amount of Compound, and JE will grant
Agouron  and/or such third party * for such  limited  purpose.  The  agreed-upon
forecasting and ordering  procedures shall provide,  at minimum,  for Agouron to
provide JE * with an * of  Agouron's * of Compound  to be  purchased  by Agouron
from JE during  the  following  * ; for the first * , the * shall be * ; for the
next * , the estimate shall be * ; and for the subsequent * , the estimate shall
* . Agouron shall use all  reasonable  efforts to make each forecast as accurate
as  possible.  Compound  will be ordered * by  Agouron,  and such firm  purchase
order(s)  shall be placed at least * (or such shorter period of time agreed upon
by the Parties) in advance of the requested  delivery date(s);  unless agreed to
by the  Parties,  no *  purchase  order  shall be plus or minus * of the  volume
included in the most recent  forecast  for such * , which was  provided to JE at
least * prior to the  scheduled  delivery  date,  and shall not provide for more
than * . All orders shall be in writing.
<PAGE>

         (e) It is the present intention of the Parties that JE shall have *
              supply of Compound to Agouron  (hereinafter  referred to as the
"JE Compound Supply Option") in accordance with the following conditions:

                  (i) Within * after the * , the Parties shall agree upon a date
         by which JE must exercise the JE Compound Supply Option 
         ("Exercise Date"); the Exercise Date shall be approximately  the date 
         which is * the expected NDA filing date for the first Product.

                  (ii) All Compound shall be manufactured in accordance with the
         specifications  to be determined during  development.  JE warrants that
         each  shipment of Compound  will  conform to the  specifications  to be
         determined  during  development,  and will be made,  stored,  packaged,
         labeled and controlled by JE in accordance with  applicable  regulatory
         standards.  JE will provide to Agouron  concurrently with each shipment
         of Compound a Certificate of Analysis with respect to such compliance.

                  (iii) JE  warrants  that the  manufacturing  facility  and the
         equipment and personnel used to produce  Compound that will be used for
         clinical studies and/or commercial supply are now, and at the time each
         batch of  Compound  is  produced  shall  be,  properly  maintained  and
         qualified  to  make  pharmaceutical   grade  products  consistent  with
         applicable Good Manufacturing Practice requirements.  Agouron agrees to
         provide  to JE  technical  support in  meeting  the Good  Manufacturing
         Practice requirements imposed by the regulatory agencies of the various
         countries of the Licensed Territory. * .

                  (iv) Sale and delivery of Compound will be subject to an  
         agreed-upon  form of  purchase  order being  issued by Agouron  and  
         accepted by JE. All sales and deliveries of Compound  shall be on the 
         basis * (in  accordance  with  INCOTERMS 1990). Title and risk of loss,
         damage and delay shall pass to Agouron *

                  (v)  If  Agouron  is  prohibited  by  formal  governmental  or
         regulatory  action in a country  located within the Licensed  Territory
         from importing into and/or selling Product containing Compound, made by
         JE or its suppliers,  or is prohibited from importing into and/or using
         Compound  made by JE or its  suppliers in the  manufacture  of Product,
         Agouron  may * its  requirements  of  Compound  for such  country,  and
         purpose.  It is understood and agreed to by the Parties that such * are
         * during which such prohibitions are in effect.

                  (vi)  Each  Party  shall  grant  the  other  Party a right  of
         reference to the drug master file for Compound in the  countries  where
         the other Party, its Affiliates or sublicensees  are marketing  Product
         containing  the  Compound,  and shall  take all  other  steps as may be
         reasonably requested by a manufacturer of such Compound for the


<PAGE>


         limited  purpose of enabling it to manufacture  Compound for such other
         Party. The manufacturer  shall manufacture  Compound in compliance with
         the  Dossier for the  Compound.  Each Party  shall  promptly  and fully
         advise the other Party of any changes, alterations or amendments to the
         drug  master  file for  Compound  or any  amendments,  instructions  or
         specifications required by the health or regulatory authority,  and the
         Parties shall confer with respect to the best mode of  compliance  with
         any such requirements.

                  (vii) In the event that,  after delivery,  Agouron  determines
         that  Compound  does  not  meet  the  applicable  specifications,  JE's
         obligations shall be * , or * for such non-conforming Compound.

     (f) At  least  *  before  the  Exercise  Date,  Agouron  shall * JE to * of
Compound for use in making  Product.  On or before the Exercise  Date,  JE shall
notify Agouron * the JE Compound Supply Option.  If JE fails to notify Agouron *
of its election to exercise the JE Compound  Supply Option on or before Exercise
Date, the JE Compound  Supply Option shall * . If the JE Compound  Supply Option
expires unexercised the following provisions apply:

                  (i)  Agouron  may  manufacture   and/or  have  a  third  party
         manufacture  its commercial  requirements of Compound in the Territory,
         and JE shall grant Agouron, and third-party  manufacturers  utilized by
         Agouron, all necessary licenses on Compound for use solely in producing
         Compound for use in making Products.

                  (ii) In accordance with the provisions of Section 4.05, * 
         for use in the JE Territory.

     (g) As  part of the  Development  Program,  JE and  Agouron  may*  and * to
optimize the cost-effective  synthesis and delivery of Compound.  JE and Agouron
shall *  Compound  * as it is * ; the  Parties  also  agree to  continue  to use
technically  and  commercially   reasonable  efforts  to  reduce  the  costs  of
manufacturing  Compound throughout the period of  commercialization of a Product
containing  such  Compound.  In accordance  with the provisions of Section 3.05,
each Party further  specifically agrees that it shall limit dissemination of and
access to the confidential and proprietary  information of the other Party which
such Party receives  pursuant to the provisions of this Section 4.04(g),  within
such Party's organization to those of its and its Affiliates' personnel who have
a  need  to  know  the  information.   JE  and  Agouron  *  low-cost  commercial
manufacturing  sources for Compound.  To assure a continuous and  cost-effective
supply of Compound during clinical development and commercialization,  JE agrees
to use its  reasonable  efforts to  utilize  low-cost  commercial  manufacturing
sources  for the  manufacture  of  Compound  and JE  agrees to engage at least *
manufacturers for the production of Compound.

<PAGE>

         SECTION 4.05 SUPPLY OF PRODUCT.  The details for manufacturing  Product
will be  determined  after the  execution  of this  Agreement,  according to the
following conditions:

     (a) Agouron shall be responsible for manufacturing Product.

     (b)  Agouron  shall * , in  accordance  with a  Product  Supply  Plan to be
entered  into  between  the  Parties,  * the  amount  of  Product  which  can be
manufactured  from * of Compound,  to be used in  implementing  the  Development
Program in the JE Territory;  the Product Supply Plan, when agreed upon, will be
incorporated as part of the Development Program.  Agouron * JE * Product for use
in  implementing  the Development  Program * which equals * of procuring  and/or
producing such Product, * such * of * ; provided, however, that JE shall provide
Agouron,  * , all Compound  necessary to  manufacture  such Product for JE (or *
Agouron  for  the  cost  of the  Compound,  plus * such  * used  by  Agouron  to
manufacture such Product for JE).

     (c) In  accordance  with the  provisions  of Section  4.04, JE shall * from
Agouron,  and  Agouron  shall  timely  deliver  Product  to be  sold  in  the JE
Territory.  The price of Product to be sold to JE by Agouron shall be at a price
which * such Product,  plus a * . "FBMCP" or "Fully Burdened  Manufacturing Cost
of Product" means the cost of Product shipped,  and shall include the direct and
indirect costs of procuring  and/or producing such Product shipped in accordance
with  either  generally  accepted   accounting   principles  or  the  equivalent
international  accounting  standards.  Direct costs shall  include  direct labor
(including fringe benefits),  direct materials  (including taxes and duties) and
third-party contract costs required to manufacture the bulk product Compound (or
related intermediates) and the finished Product. Indirect costs (to be allocated
to the production effort) shall include, but not be limited to, items treated as
"manufacturing overhead," such as indirect labor and materials, fringe benefits,
occupancy costs (including electricity,  water, waste disposal,  other utilities
and property taxes),  depreciation of property,  plant and equipment used in the
manufacturing  process, and other costs allocable to the manufacturing  process.
Overhead shall not include  start-up costs, or idle or excess capacity  charges.
Included  in the cost of Product  shall be  manufacturing  variances,  including
inventory reserves and non-conforming production runs.

     (d) Agouron  shall  maintain  books of account and  complete  and  accurate
records  of all of its FBMCP of  procuring  and/or  producing  such  Product  in
sufficient  detail to permit JE to confirm the  correctness  of such cost items.
Agouron  shall  provide JE,  upon  reasonable  request,  with copies of invoices
supporting third-party expenditures for procuring and/or producing such Product.
If JE reasonably  believes that an audit of FBMCP is appropriate after reviewing
the  information  received  from  Agouron,  JE  shall  have  the  right,  by  an
independent accounting firm reasonably acceptable to Agouron, employed by JE and
at JE's own expense,  to examine the  pertinent  books and records of Agouron at
all reasonable times (but not more often than * ) for the purpose of determining
and reporting on the  correctness of FBMCP  reported to JE; it being  understood
that such  examination,  with  respect  to any  audit for a * period,  shall not
commence  later than * following the end of such

<PAGE>

     * period.  If an error is found in the  amount of FBMCP that is more than *
of the amount initially reported to JE, then * .

     (e) Agouron  shall supply  Product to JE in  accordance  with the following
conditions:

                  (i) All Product shall be  manufactured  in accordance with the
         specifications  to be determined during  development.  Agouron warrants
         that  each  shipment  of  Product  to JE  will * be  determined  during
         development, and will be made, stored, packaged, labeled and controlled
         by Agouron in accordance with applicable regulatory standards.  Agouron
         will  provide  to JE  concurrently  with  each  shipment  of  Product a
         Certificate of Analysis with respect to such compliance.

                  (ii) Agouron warrants that the manufacturing  facility and the
         equipment and personnel  used to produce  Product that will be supplied
         to JE, at the time each batch of Product is produced shall be, properly
         maintained  and  qualified  to  make   pharmaceutical   grade  products
         consistent with applicable Good Manufacturing Practice requirements. JE
         agrees to  provide  to Agouron  technical  support in meeting  the Good
         Manufacturing  Practice requirements imposed by the regulatory agencies
         of the various countries of the JE Territory. * .

                  (iii) Sale and delivery of Product to JE will be subject to *
         being  issued by JE and  accepted by Agouron. All sales and  deliveries
         of   Product   shall   be   on   the   basis   *   (in   accordance    
         with INCOTERMS  1990). Title and risk of loss, damage and delay shall*.
                                                                  
                  (iv) JE shall grant  Agouron a right of  reference to the drug
         master file for Product in the countries of the JE Territory, and shall
         take all other steps as may be reasonably  requested by a  manufacturer
         of such  Product *  enabling  it to  manufacture  Product  for JE.  The
         manufacturer  shall manufacture  Product in compliance with the Dossier
         for the Product.  Each Party shall  promptly and fully advise the other
         Party of any changes, alterations or amendments to the drug master file
         for Product in the  countries of the JE  Territory  or any  amendments,
         instructions  or  specifications  required by the health or  regulatory
         authorities in the countries of the JE Territory, and the Parties shall
         confer  with  respect  to the  best  mode of  compliance  with any such
         requirements.

                  (v) In the event that,  after  delivery,  JE  determines  that
         Product  does  not  meet  the  applicable   specifications,   Agouron's
         obligations shall be *.

     (f)  JE,  * ,  shall  assist  Agouron  in the  identification  of  low-cost
formulating  sources for making Product.  JE shall * , to

<PAGE>

the extent available, technical and manufacturing assistance and use of its
technology and  proprietary  information to Agouron in an effort to decrease the
costs of making such Product.

     (g) In the event that: (i) any governmental or regulatory authority
issues a request, directive, or order that any Product be recalled or withdrawn;
or (ii) a court of competent  jurisdiction  in a final,  nonappealable  judgment
orders a recall or withdrawal of any Product; or (iii) JE and Agouron agree that
a Product  should be recalled or  withdrawn,  each of the Parties shall take all
appropriate  corrective  actions  to  effect  the  recall or  withdrawal  in its
respective territories,  and shall cooperate fully with each other in conducting
such recall to the full extent necessary to ensure that the recall is effective.
The costs and expenses of notification and destruction or return of the recalled
or  withdrawn  Product in the  Licensed  Territory  shall be * comply  with this
Agreement, * , its  Affiliates  or  sublicensees,  in  which  event  the  costs
and expenses s  a determination based on *. In the event that either Party has 
reasonable  scientific  grounds to  request  the other  Party  (respectively,  
the  "Requesting  Party"  and the "Requested  Party") to recall or withdraw a 
Product from the  Requested  Party's territory for health or safety  reasons and
the Requested  Party does not recall or withdraw said Product, * .

     (h) As  part  of  the  Development  Program,  JE and  Agouron  may  conduct
formulation  development  activities to optimize the cost-effective  formulation
and  delivery of Product.  JE and  Agouron  shall * their * Product  formulation
technology  * to each  other;  the  Parties  also  agree  to *  technically  and
commercially  reasonable efforts to * formulating  Product throughout the period
of * of such Product.  In accordance  with the provisions of Section 3.05,  each
Party  further  specifically  agrees  that it shall limit  dissemination  of and
access to the confidential and proprietary  information of the other Party which
such Party receives  pursuant to the provisions of this Section 4.05(h),  within
such Party's organization to those of its and its Affiliates' personnel who have
a need to know the  information.  JE and Agouron  agree to cooperate to identify
low-cost commercial  formulating sources for Product. To assure a continuous and
cost-effective  supply  of  Product  during  commercialization  of the  Product,
Agouron  agrees to use its  reasonable  efforts to utilize  low-cost  commercial
formulating sources for the formulation of Product.

                   ARTICLE V - ADVANCE PAYMENTS AND ROYALTIES

         SECTION 5.01      ADVANCED PAYMENTS AND ROYALTIES.

         (a)  Subject  to the  terms and  conditions  of this  Agreement  and in
consideration  for the rights granted to Agouron under this  Agreement,  Agouron
shall make the following one-time-only payments to JE:
<PAGE>



                                     PAYMENT

MILESTONE EVENT                                              (U.S. Dollars)

(i)   Within thirty (30) days of execution of this Agreement 
      (actually paid July 17, 1998)                          $6,000,000

(ii)  Within thirty (30) days of the earlier of:
      (1) the first completion of a Phase I Clinical
      Study for any Product; or (2) September 30, 2000*      $3,000,000

(iii) Within thirty (30) days of the earlier of:
      (1)  the first completion of a Pilot Phase II 
      Study for any Product; or (2) December 31, 2000*       $3,000,000

(iv)  Within thirty (30) days of first U.S. NDA or EMEA 
      filing for any Product                                 $6,000,000

(v)   Within thirty (30) days of first U.S. NDA approval
      for any Product                                        $3,000,000

(vi)  Within thirty (30) days of the first European 
      Commission approval for any Product
      (but not before receipt of pricing approval 
      for such Product in
      at least one (1) Major Market European Country)        $5,000,000

     TOTAL  PAYMENTS:                                       $26,000,000

     * The specified  calendar  milestone payment dates referred to in items (1)
and (2) above (i.e. for item (1):  September 30, 2000; or for item (2): December
31, 2000) shall be extended by the number of day(s) which the  completion of the
applicable  milestone  (i.e.  for item (1):  the first  completion  of a Phase I
Clinical Study for any Product;  or for item (2) the first  completion of a of a
Pilot  Phase II Study for any  Product) is delayed by reasons  beyond  Agouron's
control,  as a result of: (i) governmental  and/or regulatory actions or changes
in  policies of the  applicable  authorities;  (ii) safety or efficacy  concerns
about  JE-2147;  (iii)  failure  of JE to timely  provide  ordered  Compound  to
Agouron;  (iv)  difficulties  to find  effective  Product  formulations  despite
Agouron's  reasonable  efforts;  or (v) such other  reasons as Parties may agree
upon after good faith negotiations.
________________________________________________________________________________


* of the payments made pursuant to the provisions of this Section  5.01(a) shall
be creditable  against future royalty  payments to be made to JE pursuant to the
provisions of Section  5.01(b);  provided,  however,  that in no case shall such
credits against royalties payable to JE with respect for a semi-annual  calendar
period  exceed  more than * of the amount of  royalties  otherwise  due for such
semi-annual period. Any remaining creditable amount may be credited as described
above in subsequent  semi-annual  calendar periods against  royalties due JE for
such  semi-annual  periods.  Except  as  expressly  provided  elsewhere  in this
Agreement,  payments  made pursuant to the  provisions  of this Section  5.01(a)
shall be nonrefundable.  If Agouron elects to terminate its marketing rights for
a Product in all of the countries located in the Licensed  Territory pursuant to
the provisions of Section 6.02(b),* .

     (b)  Subject  to  the  terms  and  conditions  of  this  Agreement  and  in
consideration  for the rights granted to Agouron under this  Agreement,  Agouron
shall pay to JE a royalty * whose manufacture,  use or sale would have infringed
(in the absence of license rights granted by JE to Agouron under this Agreement)
a Valid Claim in the country(s) where such  manufacture,  use or sale of Product
occurred.

     (c) The Parties agree that the  calculation  of the amount of royalties due
shall be subject to and in accordance with the following provisions:

                  (i) Royalties under Section 5.01(b) shall be payable only once
         with  respect to a given unit of Product,  regardless  of the number of
         Valid Claims  pertaining  to such 

<PAGE>

         Product or the number of countries in which the manufacture, use or
         sale of a given unit of Product occurs.

                  (ii)  Royalties  due on the sale of a Product  shall  only be
         owed from the date of the *by a Party,  its  Affiliates or sublicensees
         of such Product in a country in the Licensed Territory, until the 
         latest of: (i) the * anniversary of the * in any dosage form of such 
         Product in such country if * in making,  using or selling such Product,
         or such earlier date as the antitrust law (or other law of similar
         nature) in such country  limiting the  accrual of royalties  requires; 
         or (ii) the * that  would  have been * by the  manufacture, use or sale
         of such Product in the  country(s)  where the  manufacture, use or sale
         of such Product occurred.

                  (iii)  Royalties  under  Section  5.02(b)  shall be payable if
         either the  manufacture,  use or sale of a Product would have infringed
         (in the absence of license  rights  granted by JE to Agouron under this
         Agreement) a Valid Claim in the country(s) where such manufacture,  use
         or sale of Product occurred.  Thus, royalties under 5.02(b) are payable
         if a Product is  manufactured in a country where a Valid Claim would be
         infringed by such manufacture,  and then is transferred for use or sale
         into a  country  where  no  such  Valid  Claims  exist.  Alternatively,
         royalties  under  5.02(b)  are  payable if a Product is first sold in a
         country where a Valid Claim would be infringed by such sale, even if no
         Valid Claims were  infringed by the  manufacture of that Product in the
         country of manufacture.

                  (iv)  If any  patent  included  within  the JE  Patent  Rights
         expires,  Agouron's  obligation  to  pay or  cause  to be  paid  patent
         royalties  on Net Sales of a Product  shall cease with  respect to such
         patent,  but patent  royalties  will  continue to be payable by Agouron
         under any other Valid Claim  covering such Product in the  jurisdiction
         where such Product was made, used or sold.

                  (v) Where no Valid  Claims are  utilized  in making,  using or
         selling  a  Product  but  JE  Technology,  and/or  Development  Program
         Technology developed  independently by JE, is utilized in making, using
         or selling the  applicable  Product,  the royalty  rate on Net Sales of
         such Product that would otherwise apply to the Net Sale of such Product
         for such  semi-annual  period in such country shall be reduced by fifty
         percent (50%).  Where no Valid Claims are utilized in making,  using or
         selling a  Product  and no JE  Technology  and/or  Development  Program
         Technology developed  independently by JE, is utilized in making, using
         or selling the applicable  Product,  no royalty shall be due on the Net
         Sales of such Product.

                  (vi) If in any country  where no such Valid Claims  exist,  or
         where the Parties mutually agree that it is not commercially reasonable
         to  pursue  third-party  infringers,   the  amount  of  non-Affiliated,
         third-party  sales of a Product  containing  Compound  in such  country
         exceeds * of the total  sales of all  products  containing  Compound in
         such country in any semi-annual  calendar period, the royalty rate that
         would  otherwise  apply for such  semi-annual  calendar  period in such
         country shall be

<PAGE>

         reduced by fifty percent (50%). The amount of sales of
         products  (for  calculations  to be made  pursuant to Section  5.02(b))
         shall be ascertained by the reputable published marketing data for such
         country or as otherwise  mutually agreed.  If the Parties are unable to
         agree  whether it is  commercially  reasonable  to pursue a third-party
         infringer, then the issue shall be decided by arbitration in accordance
         with the provisions of Section 7.03.

                  (vii) In the event that: (i) compulsory licenses for a Product
         (which compulsory  licenses have a maximum royalty rate lower than that
         which  would  otherwise  apply to Net  Sales of such  Product)  must be
         granted in a country located in the Licensed Territory, and sales under
         such  compulsory  licenses  exceed * of the total sales of all Products
         containing Compound in such country in any semi-annual calendar period;
         or (ii) a governmental authority in a country imposes a maximum royalty
         rate lower than that which would  otherwise  apply to Net Sales of such
         Products in such country,  then the royalty rate which would  otherwise
         apply for such  semi-annual  period in such country shall be reduced to
         equal such lower rate.

                  (viii) In calculating  royalties with respect to a Combination
         Product, the Parties shall enter into good-faith negotiations regarding
         the percentage of the Net Sales of such Combination  Product to be used
         in  calculating  royalties  payable  with  respect to such  Combination
         Product on a  country-by-country  basis.  If the  Parties are unable to
         agree upon such  percentage,  royalties  with respect to a  Combination
         Product in a country shall be equal to the royalty rate on Net Sales of
         such Product that would otherwise apply to the Net Sale of such Product
         for such semi-annual  period,  multiplied by a fraction whose numerator
         is a Party's, its Affiliates' or sublicensees' published sales price in
         such country for equivalent  dosages of all active ingredients that are
         Compounds  contained  in  a  given  Combination   Product,   and  whose
         denominator is such Party's, its Affiliates' or sublicensees' published
         sale  price  in such  country  for  equivalent  dosages  of all  active
         ingredients  contained therein. If the numerator and denominator cannot
         be determined in the manner set forth above,  then the numerator  shall
         be the manufacture or acquisition cost of Compounds  contained therein,
         and the  denominator  shall  be the sum of the  numerator  and the cost
         (calculated on the same basis if manufactured;  otherwise, on the basis
         of purchase price) of all other active  ingredients  contained therein.
         In each  case,  the cost is to be  determined  in  accordance  with the
         Party's standard accounting procedures. If specific value is added to a
         Product by special devices for dispensing or administering such Product
         or by diluents or similar  exogenous  materials  which  accompany  such
         Product as it is sold, the Parties,  using mechanisms  similar to those
         described above in this Section 5.01(c)(viii),  shall determine in good
         faith an amount to be deducted from the gross amount  invoiced for such
         Product to remove from the amount of Net Sales the specific value added
         to such Product by such special devices or exogenous materials.
<PAGE>

         SECTION 5.02      GENERAL LICENSING TERMS.

         (a) No sales  shall be deemed to have  occurred  as the result of sales
between and among the  Parties,  their  Affiliates  and  sublicensees;  it being
understood that sales occur when made to non-Affiliated  third-party purchasers.
A sale of a Product  shall be  deemed  to have  occurred  upon the  earliest  of
invoicing or delivery of such Product for value to a non-Affiliated  third-party
purchaser.  In the case of a sale or other disposal of a Product for value other
than in an arm's-length  transaction  exclusively  for money,  such as barter or
counter-trade,  sales shall be  calculated  using the fair market  value of such
Product (if higher than the stated sales price) in the country of disposal.

         (b) The Parties  agree that the  accounting  and  payment of  royalties
shall comply with the following terms and conditions:

                  (i) The royalty  payments  will be made  semi-annually  within
         sixty (60) days  after the last day of the months of June and  December
         during the royalty  term of this  Agreement.  Upon  payment of the such
         royalties,  Agouron shall provide JE with royalty reports that indicate
         the Net Sales by calendar month upon which the royalty is based.

                  (ii) Agouron shall remit in  immediately  available  funds the
         milestone  payments and all royalty  payments which are due pursuant to
         the  provisions  of Section 5.01 to JE by bank wire  transfer to the JE
         bank account specified by JE to Agouron. A payment shall be deemed paid
         as of the date on  which it was  wired  to the  account  JE  designated
         pursuant to the provisions of the immediately  preceding sentence.  Any
         royalty  payments  due  that are not paid on or  before  the date  such
         payments  are due shall  bear  interest  at the lower of: (A) the prime
         rate applied by the Chase Manhattan Bank in New York, New York, U.S.A.,
         on the due  date,  plus one  hundred  (100)  basis  points;  or (B) the
         highest  interest rate permitted by applicable  law,  calculated on the
         number of days in each month that such payment is delinquent.

                  (iii)  Agouron shall be entitled to withhold from a royalty or
         other  payment  due JE, the  amount,  if any,  of any  withholding  tax
         assessable  to JE,  provided  evidence  of  payment  of any such tax is
         promptly  provided to JE. If any taxes (other than  value-added  taxes)
         are  imposed on  payments  of  royalties  to JE and are  required to be
         withheld therefrom,  such taxes shall be for the account of JE, and the
         payments due to JE shall be reduced  accordingly.  Agouron shall advise
         JE and  provide  it with  copies  of the  tax  receipts  for all  taxes
         deducted  from the payment of royalties  due JE, and shall give JE such
         assistance  as may  reasonably  be  necessary  to  enable  JE to  claim
         exemption from such  withholding  liability.  The Parties will exercise
         their best  efforts to ensure that any  withholding  taxes  imposed are
         reduced  as far as  possible  under the  provisions  of any  future tax
         treaty between the United States and Japan or any other relevant treaty
         or law.

                  (iv)  Agouron  shall  maintain  and cause its  Affiliates  and
         sublicensees  to maintain  books of account and  complete  and accurate
         records  pertaining to the sale or other disposition of Products and of
         the  royalties  and other  amounts  payable  under  this  Agreement  in
         sufficient  detail to  permit JE to  confirm  the  correctness  of such
         items. 
<PAGE>

         Upon the annual  request by JE,  Agouron,  at its own  expense,
         agrees to instruct its independent  accounting firm to perform,  during
         Agouron's  annual  audit,  such  additional   auditing  and  accounting
         procedures as are necessary to enable such  accounting  firm to confirm
         to JE the correctness of the amounts stated in any reports  provided by
         Agouron.  Notwithstanding the preceding, if JE reasonably believes that
         an additional  audit is  appropriate  after  reviewing the  information
         received from Agouron's independent  accounting firm, JE shall have the
         right, by an independent  accounting or audit specialty firm reasonably
         acceptable  to  Agouron,  employed  by JE and at JE's own  expense,  to
         examine  pertinent  books and records of Agouron and its Affiliates and
         sublicensees,   including  royalty  reports  of  sublicensees,  at  all
         reasonable  times (but not more often than once each calendar year) for
         the purpose of  determining  and reporting on the  correctness  of such
         accounting; it being understood that such examination,  with respect to
         any annual audit, shall not commence later than two (2) years following
         the end of such annual  auditing  period.  If an error is found in such
         accounting which is more than five percent (5%) of the amount initially
         stated in such  accounting,  then  Agouron  shall  reimburse JE for the
         reasonable  cost of such audit.  Adjustments in the amounts due because
         of an audit shall be settled on or before the next semi-annual  payment
         date.  Any payments  due pursuant to the terms of this Section  5.02(b)
         that are not paid on or  before  the date such  payments  are due shall
         bear  interest at the lower of: (i) the prime rate applied by the Chase
         Manhattan Bank in New York, New York, U.S.A., on the due date, plus one
         hundred (100) basis points; or (ii) the highest interest rate permitted
         by applicable law,  calculated on the number of days in each month that
         such payment is delinquent.

         (c) Upon the  expiration  of the  foregoing  royalty  obligations  in a
country,  Agouron  shall  be  thereafter  free,  at no  cost  to JE,  to use any
remaining JE Technology to  commercialize  generic  equivalents of the Compound,
intermediates  thereof and  Products in such country on a  non-exclusive  basis;
provided,   however,  that  such  commercialization  is  subject  to  any  other
continuing  obligations due JE, including license  obligations under Article II,
if any.

         (d) The Parties agree in the future to use their reasonable  efforts to
negotiate any additional licensing terms for the Compound, intermediates thereof
and/or  Products which may be necessary to clarify the rights and obligations of
the Parties.

         SECTION 5.03      FOREIGN CURRENCY.

         (a) Net Sales and any milestone and royalty  amounts shall be stated in
United States  dollars.  Remittal of milestone  payments and royalties  shall be
made in United States  dollars.  Any required  conversion of Net Sales to United
States dollars shall be done using the monthly  average rate of exchange for the
calendar month in which such Net Sales  occurred.  The conversion from a foreign
currency  to United  States  dollars  shall be made by using the  average of the
daily  official  rates  of  exchange  for  each day in the  calendar  month,  as
published  by the New  York  edition  of the Wall  Street  Journal,  or  another
qualified source that is mutually acceptable to the Parties.

         (b) To the extent the local  currency of the country in which a sale of
Product  occurs can be freely  converted into United States dollars and remitted
to a United States bank account,  

<PAGE>

payments  of  royalties  shall be made in United  States  dollars to a bank
account  designated by JE. If, due to restrictions or prohibitions  imposed by a
national or  international  authority,  such conversion or remittance  cannot be
made,  the Parties shall consult to find a prompt and acceptable  solution,  and
Agouron  shall,  from time to time,  deal with  such  monies as JE may  lawfully
direct,  but  at  no  additional  out-of-pocket  expense.   Notwithstanding  the
foregoing,  if  required  remittances  in any  country  cannot be  converted  or
remitted to JE for any reason  within three (3) months after such  remittance is
otherwise  due,  then Agouron  shall be obligated to deposit the local  currency
equivalent of the required United States dollar  remittance in a bank account in
such  country  in the name of JE.  If free  conversion  of such  funds to United
States  dollars  is not  possible  within  twelve  (12)  months of the  original
remittance due date, Agouron shall transfer such local currency funds (including
any  interest  earned  from the  deposit of the local  currency)  to JE. If free
conversion of such funds to United States dollars becomes possible within twelve
(12)  months of the  original  remittance  due  date,  the  conversion  of local
currency to United States dollars shall be based on the monthly  average rate of
exchange for the calendar  month  immediately  preceding the month in which such
remittance is made, as such average rate of exchange is computed above.

                        ARTICLE VI - TERM AND TERMINATION

         SECTION 6.01  TERMINATION FOR BREACH.  Either Party may, at its option,
terminate  this  Agreement for cause in the event the other Party shall commit a
material breach of this Agreement and shall fail to cure such breach during: (i)
the one hundred  twenty (120) day period  (thirty (30) day period in the case of
any payment default)  following  receipt of a written notice of such breach from
the  non-breaching  Party if such  material  breach can be  reasonably  remedied
within such one hundred  twenty (120) day period;  or (ii) the two hundred forty
(240) day period  following  receipt of a written notice of such breach from the
non-breaching Party if such material breach cannot be reasonably remedied within
one hundred  twenty  (120) days after such  notice,  provided  that the Party in
material breach diligently  endeavors to remedy such material breach, and it may
be reasonably  concluded that such material breach is remediable within such two
hundred forty (240) day period. After the end of the applicable cure period, the
Party who has the right of termination  may exercise its  termination  option by
giving the breaching Party prior written notice of at least fifteen (15) days of
its election to terminate.  Any  termination of this Agreement shall not release
the  breaching  Party  from  any  obligations   incurred   hereunder,   and  the
non-breaching Party shall be entitled to pursue an action for damages arising as
a result of such material breach.

         SECTION 6.02      TERMINATION BY AGOURON.

         (a) Agouron may elect to cancel the development  and  Registration of a
Product in a country  located in the Licensed  Territory  upon ninety (90) days'
written notice.  In the event that Agouron elects to discontinue the development
and  Registration of a Product in a country  located in the Licensed  Territory,
JE, its Affiliates and sublicensees shall be free, without any further action by
JE or Agouron, to develop and/or commercialize Products in such country on their
own or with any third party,  and to retain,  use and disclose to any such third
party  information and materials that have been developed in the development and
Registration  of a Product;  provided  that JE shall not  disclose to such third
party the  confidential  and  proprietary  information  of 

<PAGE>

Agouron (other than clinical,  regulatory and manufacturing information and
materials   specifically  relating  to  such  Product).  In  the  event  of  the
discontinuation  of Agouron's  development  and  Registration  of a Product in a
country,  the licenses  granted to it by the  provisions of Section 2.01 to use,
offer for sale,  sell and/or import in or into such country,  such Product under
applicable JE Patent Rights and  Development  Program Patent  Rights,  and using
applicable JE Technology and Development Program Technology shall be terminated.
Agouron shall  transfer  ownership of any Dossiers for a Product in such country
to JE, and shall cooperate with JE to effect an orderly  transition of Agouron's
development and Registration responsibilities in such country to JE.

         (b) Agouron may elect to terminate its  marketing  rights for a Product
on a  country-by-country  basis upon ninety (90) days'  written  notice.  In the
event that Agouron  elects to terminate its marketing  rights for a Product in a
country:  (i) the licenses  granted to Agouron by the provisions of Section 2.01
to use, offer for sale,  sell and/or import in or into such country such Product
under  applicable JE Patent Rights and  Development  Program Patent Rights,  and
using  applicable JE Technology  and  Development  Program  Technology  shall be
terminated,  and JE and its Affiliates and sublicensees  shall be free to market
such Product in such  country on its own or with any third  party;  (ii) Agouron
shall transfer ownership to JE of any Dossiers for such Product in such country;
and (iii) Agouron  shall  cooperate  with JE to effect an orderly  transition of
Agouron's marketing responsibilities in such country to JE.

         (c) If there is a material  breach of this  Agreement by JE but Agouron
nevertheless  wishes to retain its rights granted by the terms of this Agreement
in Compound  and/or  Products,  then Agouron  shall be entitled to terminate the
licenses  granted to JE and to pursue an action for damages  arising as a result
of such material breach.

         SECTION 6.03 TERMINATION BY MUTUAL  AGREEMENT. The Parties may at any
time terminate  this  Agreement,  in  part  or in its  entirety,  by  mutual  
written agreement.

         SECTION 6.04 TERMINATION UPON BANKRUPTCY.  In the event that a Party is
subject to any proceeding under the bankruptcy laws, including  appointment of a
receiver,   trustee,   liquidator   or  other   custodian  of  its  business  or
substantially  all of its assets,  and such proceeding,  if involuntary,  is not
dismissed  or  discharged  within  one  hundred  fifty  (150)  days  after  such
proceeding is instituted, or upon the liquidation, dissolution, or winding up of
its business,  then this Agreement, at the election of the other Party, shall be
terminated  in its  entirety  for  cause  upon a notice in  writing  of at least
fifteen (15) days from the Party who is not bankrupt or insolvent.

         SECTION 6.05 DISPOSITION OF INVENTORY. In the event of the cancellation
or termination of any license rights with respect to a Product, the inventory of
such Product may be sold for up to six (6) months after date of  cancellation or
termination, provided the required payments, if any, are paid thereon.

         SECTION 6.06 EFFECT OF  TERMINATION.  The termination of this Agreement
shall, to the extent not otherwise  expressly provided herein, have no effect on
the rights and  obligations of the Parties under this Agreement with respect to:
(i)  the  Parties'   obligations   of   confidentiality,   

<PAGE>

indemnification  and  compensation for services  performed;  (ii) a Party's
liability  for failure to fulfill its  obligations  or  undertakings  under this
Agreement;  and  (iii)  the  rights  or  obligations  of the  Parties  otherwise
expressly stated in this Agreement to survive the termination of this Agreement.
Any other  provisions  of this  Agreement  that by their  nature are intended to
survive  termination shall also survive.  Upon any termination of this Agreement
in its entirety because of a breach of a Party,  neither Party waives any rights
to any remedies it may have arising out of the termination.  In the event of any
breach  by a Party  with  respect  to the  obligations  which  continue  after a
termination in its entirety of this  Agreement,  the  non-breaching  Party shall
have all remedies  available to it, as if the Agreement  were still in effect on
the date of such breach.

                     ARTICLE VII - WARRANTIES AND COVENANTS;
                   INDEMNITIES; INSURANCE; DISPUTE RESOLUTION

         SECTION 7.01      WARRANTIES AND COVENANTS.

         (a) Each Party  represents  and warrants to the other Party that it has
the legal power, authority and right to enter into this Agreement and to perform
all of its respective  obligations  set forth herein,  including the attachments
hereto.

         (b)  JE  acknowledges  and  represents  that  the  patents  and  patent
applications  listed in Schedule 2 are the only patents and patent  applications
included  within the JE Patent  Rights that are jointly  owned by JE and a third
party,  and that such  patents and patent  applications  are only subject to the
conditions and  restrictions  noted on Schedule 2 and, except as otherwise noted
on Schedule 2, that the  license of such JE Patent  Rights to Agouron  under the
terms of this  Agreement  do not  require the  consent of such joint  owner.  JE
further represents and warrants that none of the JE Patent Rights are subject to
the provisions of the * .

         (c) JE represents  and warrants  that, as of the date this Agreement is
executed,  it was not  aware of the  existence  of any  patent  applications  or
patents  owned and  Controlled  by a third party  covering  Compound  that might
materially  prevent the Parties  from  commercializing  Compound in the Licensed
Territory, except for the patent application listed in Schedule 7.01(c).

         (d) JE represents  and warrants that: (i) it has the right to grant the
licenses  set forth in  Article  II;  and (ii)  there  are no  suits,  claims or
proceedings pending in any court or by or before any governmental body or agency
with  respect to the JE Patent  Rights or JE  Technology  that would  materially
interfere with the ability of Agouron to fully exercise the licenses  granted to
it under this  Agreement,  including the exclusive  license rights under Section
2.01(a). Agouron represents that, to the best of its knowledge, it does not have
any  know-how,  trade  secret,   experimental  data,  formula,  expert  opinion,
experimental  procedure or other  confidential  and/or  proprietary  information
specifically  concerning the Compound,  intermediates thereof, or a Product that
was developed or acquired by or on behalf of Agouron  before the Effective  Date
of this Agreement that is necessary for either:  (i) the formulation  (including
sustained-release formulations), manufacture, use and/or application of Product;
or (ii)  obtaining  Registration  of  Product,  including,  but not  limited to,
information and data arising out of pre-clinical  and clinical trials  involving
Product and all NDA applications for Product,  and which is under the Control of
Agouron.

<PAGE>

         (e) Each  Party  covenants  that it shall not commit any act or fail to
take any action that,  in any  significant  way,  would be in conflict  with its
material obligations under this Agreement and the attachments hereto.

         (f) Each Party  promises to comply in all  material  respects  with the
terms of the licenses granted to it under this Agreement,  and with all federal,
state,  local  and  foreign  laws,  rules  and  regulations  applicable  to  the
development,   manufacture,   distribution,  import  and  export,  and  sale  of
pharmaceutical products pursuant to this Agreement.

         (g) EXCEPT AS OTHERWISE  EXPRESSLY PROVIDED IN THIS AGREEMENT,  EACH OF
THE PARTIES MAKES NO WARRANTIES,  EXPRESSED OR IMPLIED,  OF  MERCHANTABILITY  OR
FITNESS FOR A  PARTICULAR  PURPOSE OF ANY  SUBJECT  MATTER  INCLUDED  WITHIN THE
CLAIMS OF THE PATENT RIGHTS,  INCLUDING THE COMPOUND. THE PARTIES UNDERSTAND AND
AGREE THAT  DEVELOPMENT AND  COMMERCIALIZATION  OF COMPOUND AND/OR PRODUCTS WILL
INVOLVE  APPROVAL BY REGULATORY  AUTHORITIES,  AND THAT NO PARTY IS GUARANTEEING
THE SAFETY OR EFFICACY OF COMPOUND  AND/OR  PRODUCTS,  OR THAT  COMPOUND  AND/OR
PRODUCTS WILL RECEIVE THE REQUIRED APPROVALS.

         SECTION 7.02      INDEMNITIES; INSURANCE.

         (a) Agouron shall  indemnify  and hold harmless JE and its  Affiliates,
employees,  and agents (a "JE  Indemnified  Party") from and against any and all
liabilities,   losses,   damages,   costs,  or  expenses  (including  reasonable
investigative  and attorneys'  fees) which the JE  Indemnified  Party may incur,
suffer or be required to pay resulting  from or arising in  connection  with any
product  liability or other claims  (other than claims for patent  infringement)
arising  from the use by any person of any  Product,  to the extent such product
liability or other claim  results from the  negligent,  reckless or  intentional
misconduct of Agouron,  its  Affiliates  or  sublicensees,  or their  respective
employees  and  agents,  or on account  of  Agouron's  failure  to  fulfill  its
obligations or undertakings under this Agreement;  provided, however, that in no
event  shall  Agouron  be liable  to a JE  Indemnified  Party for any  indirect,
incidental,  special or  consequential  damages,  including  loss of revenues or
profits from sales of Products.

         (b) JE shall  indemnify and hold harmless  Agouron and its  Affiliates,
employees,  and agents (an "Agouron Indemnified Party") from and against any and
all  liabilities,  losses,  damages,  costs, or expenses  (including  reasonable
investigative and attorneys' fees) that the Agouron Indemnified Party may incur,
suffer or be required to pay,  resulting from or arising in connection  with any
product  liability or other claims  (other than claims for patent  infringement)
arising  from the use by any person of any  Product,  to the extent such product
liability or other claim  results from the  negligent,  reckless or  intentional
misconduct of JE, its Affiliates or sublicensees,  or their respective employees
and  agents,  or on  account  of JE's  failure to  fulfill  its  obligations  or
undertakings under this Agreement;  provided, however, that in no event shall JE
be liable to an Agouron Indemnified Party for any indirect,  incidental, special
or  consequential  damages,  including loss of revenues or profits from sales of
Products.


<PAGE>

         (c) To the extent that a product liability or other claim (other than a
claim  for  patent  infringement)  results  from  the  negligent,   reckless  or
intentional  misconduct of more than one Party, their Affiliates,  sublicensees,
or their  respective  employees  and agents,  the  Parties  agree to share in an
equitable  manner  such  liabilities,  losses,  damages,  costs,  or expenses in
proportion  to the  relative  fault of each of the  Parties,  their  Affiliates,
sublicensees, or their respective employees and agents.

         (d) Unless the Parties agree otherwise, all other liabilities,  losses,
damages,  costs, or expenses (including reasonable  investigative and attorneys'
fees) under this Section  7.02  relating to or involving a Product in a country,
except as provided by the terms of Sections  7.02(a),  (b) and (c), shall be the
responsibility  of the Party  marketing such Product in such country.  The Party
marketing a Product in a country shall indemnify the non-marketing Party in such
country from and against any and all  liabilities,  losses,  damages,  costs, or
expenses  (including  reasonable  investigative  and attorneys' fees) which such
non-marketing  Party may incur,  suffer or be required to pay resulting  from or
arising in  connection  with any product  liability or other claims  (other than
claims  for  patent  infringement)  arising  from the use by any  person of such
Product  in such  country.  Section  3.02  sets  forth  the  Parties'  liability
obligations arising from claims for patent infringement.

         (e) The  aforesaid  obligations  of the  indemnifying  Party  shall  be
subject to the indemnified Party fulfilling the following obligations:

                  (i) The  indemnified  Party  shall  fully  cooperate  with the
         indemnifying Party in the defense of any claims,  actions,  etc., which
         defense shall be controlled by the indemnifying Party.

                  (ii) The indemnified  Party shall not, except at its own cost,
         voluntarily  make any payment or incur any expense  with respect to any
         claim or suit  without the prior  written  consent of the  indemnifying
         Party, which consent such Party shall not be required to give.

                  (iii) The  indemnified  Party  shall  notify the  indemnifying
         Party  promptly  after receipt of a notice of the  commencement  of any
         litigation or threat  thereof that may  reasonably  lead to a claim for
         indemnification.

         (f) The  Parties  agree to  maintain  appropriate  amounts  of  product
liability  insurance  coverage  and to  have  the  other  Party  included  as an
additional insured on such policies.

         SECTION 7.03 DISPUTE  RESOLUTION.  In the event of any  controversy  or
claim arising out of or relating to any provision of this  Agreement or any term
or condition hereof, or the performance by a Party of its obligations hereunder,
the Parties shall try to settle their differences  amicably between  themselves.
If the  representatives of the Parties are unable to reach agreement on any such
issue, the issue shall be submitted for  consideration,  in the case of Agouron,
to a  designee  of its  Chief  Executive  Officer  and,  in the case of JE, to a
designee of its Managing Director of Pharmaceuticals  and Biobusiness  Division.
If such designees are unable to agree,

<PAGE>

then the issue  shall be  resolved,  in the case of  Agouron,  by its Chief
Executive  Officer  and,  in  the  case  of  JE,  by its  Managing  Director  of
Pharmaceuticals and Biobusiness Division.  Any unresolved issues arising between
the  Parties  relating  to,  arising out of, or in any way  connected  with this
Agreement or any term or condition  hereof, or the performance by a Party of its
obligations  hereunder,  whether before or after  termination of this Agreement,
except as otherwise  provided in this  Agreement,  shall be finally  resolved by
binding  arbitration.  Whenever a Party shall  decide to  institute  arbitration
proceedings, it shall give written notice to that effect to the other Party. The
Party  giving  such  notice  shall  refrain  from  instituting  the  arbitration
proceedings for a period of sixty (60) days following such notice.  If JE is the
Party  initiating the arbitration,  the arbitration  shall be held in San Diego,
California,  according  to the  rules of the  American  Arbitration  Association
("AAA").  If Agouron is the Party  initiating the  arbitration,  the arbitration
shall be held in Tokyo,  Japan,  according to the rules of the Japan  Commercial
Arbitration Association ("JCAA"). The arbitration shall be conducted by a single
arbitrator  mutually  chosen by the Parties.  If the Parties cannot agree upon a
single  arbitrator  within  fifteen  (15)  days  after  the  institution  of the
arbitration  proceeding,  then the arbitration  shall be conducted by a panel of
three  arbitrators  appointed in accordance  with  applicable AAA or JCAA rules;
provided,  however,  that each Party  shall,  within  thirty (30) days after the
institution of the  arbitration  proceedings,  appoint one  arbitrator  with the
third arbitrator  being chosen by the other two  arbitrators.  If only one Party
appoints an  arbitrator,  then such  arbitrator  shall be entitled to act as the
sole arbitrator to resolve the controversy.  Any arbitration  hereunder shall be
conducted  in  the  English  language,  to  the  maximum  extent  possible.  All
arbitrator(s)  eligible to conduct the  arbitration  must agree to render  their
opinion(s)  within  thirty  (30)  days of the  final  arbitration  hearing.  The
arbitrator(s)  shall have the authority to grant injunctive  relief and specific
performance and to allocate between the Parties the costs of arbitration in such
equitable manner as he/she determines;  provided, however, that each Party shall
bear its own costs and attorneys' and witness' fees.  Notwithstanding  the terms
of this Section 7.03, a Party shall also have the right to obtain,  prior to the
arbitrator(s)   rendering  the  arbitration   decision,   provisional  remedies,
including  injunctive  relief  or  specific  performance,  from a  court  having
jurisdiction thereof. The arbitrator(s) shall, upon the request of either Party,
issue a written opinion of the findings of fact and conclusions of law and shall
deliver a copy to each of the Parties.  Decisions of the arbitrator(s)  shall be
final and binding on all of the  Parties.  Judgment on the award so rendered may
be entered in any court having jurisdiction thereof.

                     ARTICLE VIII - DISCLOSURE OF AGREEMENT

         SECTION  8.01  DISCLOSURE  OF  AGREEMENT.  Except  as  agreed to by the
Parties,  and as required  for the  performance  of its  obligations  hereunder,
neither JE nor Agouron  shall  release any  information  to any third party with
respect to any of the terms of this Agreement  without the prior written consent
of the other Party,  which  consent  shall not  unreasonably  be withheld.  This
prohibition  includes,  but is not limited to, press  releases,  educational and
scientific  conferences,  promotional  materials and discussions with the media.
The Parties shall jointly  prepare and release a public  announcement  regarding
the existence of this  Agreement.  If a Party  determines that it is required by
law,  including  securities laws and  regulations  pertaining to publicly traded
companies, to release information to any third party regarding the terms of this
Agreement,  it shall notify the other Party of this fact prior to releasing  the
information.  The  notice  to the  other  Party  shall  include  the text of the
information proposed for release. The other Party shall have 

<PAGE>

the right to confer with the  notifying  Party  regarding the necessity for
the disclosure  and the text of the  information  proposed for release,  but the
notifying Party shall have the discretion to release the information as it deems
necessary to fulfill its requirements under law.  Notwithstanding the preceding,
JE and Agouron shall each have the right to disclose the terms of this Agreement
to persons  it  proposes  to enter into  business  relationships  with,  if such
persons are subject to confidentiality  and use obligations  equivalent to those
applicable to the disclosing Party hereunder.

                         ARTICLE IX - GENERAL PROVISIONS

         SECTION 9.01 NO IMPLIED LICENSES. Only the licenses granted pursuant to
the express terms of this Agreement  shall be of any legal force and effect.  No
license rights shall be created by implication or estoppel.

         SECTION  9.02 NO WAIVER.  Any  failure by a Party to enforce  any right
which it may have  hereunder  in any  instance  shall not be deemed to waive any
right which it or the other Party may have in any other instance with respect to
any provision of this  Agreement,  including the provision  which such Party has
failed to enforce.

         SECTION  9.03  SEVERABILITY;  GOVERNMENT  ACTS.  In the event  that any
provision  of  this  Agreement  is  judicially,  or  by a  competent  authority,
determined to be  unenforceable,  in part or in whole, with regard to any or all
of the countries in the Territory,  the remaining provisions or portions of this
Agreement  shall be valid and binding to the fullest  extent  possible,  and the
Parties shall endeavor to negotiate  additional terms, as feasible,  in a timely
manner so as to fully  effectuate  the original  intent of the  Parties,  to the
extent  possible,  in the  applicable  countries.  In the  event  that  any act,
regulation,  directive, or law of a country, including its departments, agencies
or courts  should make  impossible  or prohibit,  restrain,  modify or limit any
material act or obligation of a Party under this Agreement,  and if any Party to
this  Agreement is  materially  adversely  affected  thereby,  the Parties shall
attempt in good faith to negotiate a lawful and enforceable modification to this
Agreement that  substantially  eliminates the material adverse effect;  provided
that,  failing  any  agreement  in that  regard,  the  Party  who is  materially
adversely  affected shall have the right, at its option, to suspend or terminate
this Agreement as to such country.

         SECTION 9.04 AMBIGUITIES.  Ambiguities, if any, in this Agreement shall
not be construed against any Party, irrespective of which Party may be deemed to
have authored the ambiguous provision.

         SECTION 9.05 NOTIFICATION AND GOVERNMENTAL  APPROVALS.  After execution
of this Agreement,  to the extent required by law, Agouron,  after  consultation
with JE,  shall notify the  appropriate  authorities  in the Licensed  Territory
about the terms of this Agreement;  JE, after  consultation with Agouron,  shall
notify the  appropriate  authorities in the JE Territory about the terms of this
Agreement.  JE and Agouron shall obtain any government  approval(s)  required to
enable this Agreement to become effective, or to enable any payment hereunder to
be  made,  or any  other  obligation  hereunder  to be  observed  or  performed.
Third-party costs and expenses incurred in notifying governmental authorities or
obtaining  governmental  approval shall be 

<PAGE>

shared equally  between the Parties.  Each Party shall keep the other Party
informed  of  its  progress  in  notifying  such  governmental  authorities  and
obtaining such government approval,  and shall cooperate with the other Party in
any such efforts.

         SECTION 9.06 U.S. EXPORT CONTROLS. The Parties agree to comply with the
United  States laws and  regulations  governing  exports and  re-exports  of the
Compound,  intermediates thereof,  Products,  Development Program Technology, JE
Technology  or any other  technology  or software  developed  or  disclosed as a
result of this Agreement.  The Parties  acknowledge  that any performance  under
this Agreement is subject to any restrictions which may be imposed by the United
States laws and regulations governing exports and re-exports.  Each Party agrees
to provide the other Party with any  reasonable  assistance,  including  written
assurances  which may be required by a competent  governmental  authority and by
applicable  laws  and  regulations  as a  precondition  for  any  disclosure  of
technology or software by the other Party under the terms of this Agreement. The
obligations of this Section 9.06 shall survive termination or expiration of this
Agreement.

         SECTION  9.07 NO  AGENCY.  JE and  Agouron  shall  have the  status  of
independent contractors under this Agreement and, except as otherwise explicitly
provided in this  Agreement,  nothing in this Agreement shall be construed as an
authorization of a Party to act as an agent of the other Party.

         SECTION 9.08 CAPTIONS;  NUMBER;  OFFICIAL LANGUAGE. The captions of the
articles  and  sections  of this  Agreement  are  for  general  information  and
reference  only, and this Agreement  shall not be construed by reference to such
captions.  Where applicable in this Agreement,  the singular includes the plural
and vice  versa.  To the extent  appropriate,  the  meaning of terms whose first
letters  are  capitalized,  but which are  variations  of terms that are defined
elsewhere  in this  Agreement,  shall each have the same  meaning as the defined
term.  English shall be the official  language of this Agreement and any license
agreement  provided for hereunder,  and all  communications  between the Parties
hereto shall be conducted in that language.

         SECTION 9.09 FORCE  MAJEURE.  A Party shall not be  responsible  to the
other Party for any failure,  delay or interruption in the performance of any of
its obligations  under this Agreement if such failure,  delay or interruption is
caused by any act of God,  earthquake,  fire,  casualty,  flood, war,  epidemic,
riot,  insurrection,  or  any  act,  exercise,  assertion  or  requirement  of a
governmental  authority,  or other cause  beyond the  reasonable  control of the
Party  affected if the Party  affected shall have used its best efforts to avoid
such  occurrence.  If a  Party  believes  that  the  performance  of  any of its
obligations  under this Agreement shall be delayed or interrupted as a result of
any of the reasons  stated in this Section 9.09, and provided such Party is able
to do so,  such Party  shall  promptly  notify the other  Party of such delay or
interruption and the cause therefor, and shall provide such other Party with its
estimate of when the performance of its obligations shall  recommence.  When the
Party affected is able to recommence the  performance of obligations  delayed or
interrupted  as a result of any of the reasons  stated in this Section  9.09, it
shall so notify  the other  Party  and,  except as  otherwise  provided  in this
Agreement, it shall promptly resume the performance of such obligations.


<PAGE>

         SECTION 9.10  AMENDMENT.  This  Agreement,  including the  Attachments,
Exhibits  and  Schedules,  constitutes  the full  agreement  of the Parties with
respect to the subject  matter of this  Agreement,  and  incorporates  any prior
discussions  between them with respect to such subject  matter.  This  Agreement
supersedes the rights and  obligations of JE and Agouron under the  Confidential
Disclosure  Agreement and the Material  Transfer  Agreement  between the Parties
which were both  originally  entered into on December 22, 1997.  This Agreement,
including  the  attachments  hereto,  shall  not  be  amended,  supplemented  or
otherwise modified, except by an instrument in writing signed by duly authorized
officers of the Parties.

         SECTION 9.11  APPLICABLE LAW. This Agreement shall be construed and the
rights of the Parties shall be determined in accordance  with the laws of Japan;
provided,  however,  that with  regard to issues  concerning  the  validity  and
construction of patents,  trademarks and other intellectual property, the rights
of the Parties shall be  determined  in accordance  with the laws of the country
under which such intellectual property rights were granted.

         SECTION  9.12  NOTICES.  Any notice  required or  permitted to be given
under this Agreement shall be in writing and shall be given in person, delivered
by recognized overnight delivery service, sent by mail (certified or registered,
or air mail for addresses  outside of the  continental  U.S.), or by telefax (or
other similar means of electronic communication),  whose receipt is confirmed by
confirming telefax,  and addressed,  in the case of JE, to its Managing Director
of Pharmaceuticals and Biobusiness  Division and, in the case of Agouron, to the
Senior Vice President, Commercial Affairs (with a copy to the Legal Department),
at the addresses shown at the beginning of this Agreement,  or such other person
and/or address as may have been  furnished in writing to the notifying  Party in
accordance  with the  provisions  of this  Section  9.12.  Except  as  otherwise
provided herein,  any notice shall be deemed delivered upon the earliest of: (i)
actual  receipt;  (ii) four (4) business days after delivery to such  recognized
overnight  delivery service;  (iii) eight (8) business days after deposit in the
mail; or (iv) the date of receipt of the confirming telefax.

         SECTION 9.13 ASSIGNMENT.  This Agreement shall be assignable by a Party
to its Affiliates; if this Agreement is assigned by a Party to an Affiliate, the
Party shall still be responsible for all of its obligations as specified in this
Agreement.   This   Agreement   shall  only  be  assignable  by  a  Party  to  a
non-Affiliated  third party with the prior  written  consent of the other Party,
which consent may be withheld at the sole  discretion  of such other Party.  Any
such  assignment  without the prior written  consent of the other Party shall be
void.  Notwithstanding the preceding, in the event of: (i) a sale or transfer of
all  or  substantially   all  of  a  Party's  assets;  or  (ii)  the  merger  or
consolidation  of  a  Party  with  another  company,  this  Agreement  shall  be
assignable to the transferee or successor company.

          SECTION  9.14  SUCCESSION. This Agreement shall be  binding  upon  all
successors in interest, assigns, trustees and other legal representatives of the
Parties.

<PAGE>

         IN WITNESS WHEREOF,  the Parties hereto have executed this Agreement at
a formal  signing  ceremony on July 28, 1998, in duplicate  originals,  by their
respective officers thereunto duly authorized.

JAPAN ENERGY CORPORATION                     AGOURON PHARMACEUTICALS, INC.


By:       /s/ Nimoyama                       By:      /s/ Johnson
Name:    Akihiko Nimoyama                    Name:    Peter Johnson
Title:   Representative Director and         Title:   Chief Executive Officer
         President                                    and President

By:      /s/ Irino                           By:      /s/ Friedman
Name:    Ken Irino                           Name:    Gary E. Friedman, Esq.
Title:   Senior Management Director          Title:   Corporate V.P. and
                                                      General Counsel


WITNESSED BY:

By:       /s/ Miyake                         By:      /s/ Snyder
Name:    Toshinobu Miyake                    Name:    R. Kent Snyder
Title:   Assoc. Dir.,                        Title:   Senior Vice President
         General Mgr. of Coordination                 Business Development
         Pharmaceuticals & Biobusiness Division                                 


<PAGE>


                                                      
                                   SCHEDULE 1

                                        *




<PAGE>


                                                       
                                   SCHEDULE 2


                                        *



<PAGE>


                                                   
                                SCHEDULE 7.01(c)


                                        *



<PAGE>


                                                       
                                    EXHIBIT 1


                                        *


<PAGE>


                                                       
                                  ATTACHMENT 1


                                        *

                                                
                                                                   
   PORTIONS OF THIS DOCUMENT HAVE BEEN OMITTED (DESIGNATED BY AN ASTERISK (*)
     AND WHITE SPACE) AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
           COMMISSION PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT
                     DATED AUGUST 4, 1998; FILE NO. 0-15609
                         COMMON STOCK PURCHASE AGREEMENT

       This Common Stock Purchase  Agreement  ("Agreement")  is made and entered
into as of June 11,  1998 by and  between THE IMMUNE  RESPONSE  CORPORATION.,  a
Delaware  corporation  (hereinafter  referred  to as the  Company)  and  AGOURON
PHARMACEUTICALS,  INC.,  a California  corporation  ("Agouron"),  which  parties
hereby agree as follows:

1.     AUTHORIZATION; COMMITMENT; CLOSING

       1.01 AUTHORIZATION.  The Company proposes to authorize, issue and sell to
Agouron on or before  January 15,  2000,  certain  amounts of its common  stock,
$.0025 par value ("Common Stock"), as described and determined below.

       1.02  COMMITMENT.  Subject to Paragraph 5.06 and the terms and conditions
hereof and on the basis of the  representations  and warranties  hereinafter set
forth,  the Company  agrees to issue and sell to Agouron,  and Agouron  agree to
purchase  from the Company as of the dates and for the  consideration  set forth
below, the number of shares of the Company's  Common Stock as determined  below.
The Common  Stock  which  Agouron  is  acquiring  pursuant  to the terms of this
Agreement is hereinafter  referred to as "Restricted  Common Stock".  Agouron is
hereinafter  sometimes  referred to as the  "Purchaser."  The  purchases  of the
Common Stock shall occur on the seven  purchase  dates set forth below.  On each
purchase  date,  Agouron  shall be entitled to acquire  such number of shares of
Restricted  Common  Stock  (rounded  up to the  nearest  whole  share) as may be
purchased for  $2,000,000,  at a purchase  price equal to the stated premium set
forth  opposite the applicable  purchase  date,  over the then fair market value
("FMV") of the Common Stock on The NASDAQ Stock Market.  FMV shall be defined as
the average closing price of the Common Stock on The NASDAQ Stock Market for the
five (5) trading days immediately preceding the referenced purchase date. In the
event the FMV is * on any purchase date, the premium applicable to such purchase
date shall be adjusted to *

PURCHASE DATE                      PURCHASE PRICE                PREMIUM OVER FM
- -------------                      --------------                ---------------
June 11, 1998                      $2,000,000                           50%
October 15, 1998                   $2,000,000                            *
January 15, 1999                   $2,000,000                            *
April 15, 1999                     $2,000,000                            *
July 15, 1999                      $2,000,000                            *
October 15, 1999                   $2,000,000                            *
January 15, 2000                   $2,000,000                            *

       1.03  CLOSING.  Separate  closings  of  the  purchase  and  sale  of  the
Restricted Common Stock  ("Closings")  shall occur on each of the purchase dates
set forth  above and shall take place at such time and place as the  Company and
Purchaser  shall agree.  At each Closing the Company  shall deliver to Purchaser
the number of shares of  Restricted  Common Stock  required by  Paragraph  1.02,
above,  upon  delivery to the Company by Purchaser of a certified  check or wire
transfer of funds in the amount of $2,000,000. The Restricted Common Stock to be
delivered  to Agouron  hereunder  at each  Closing will be evidenced by a single
certificate  

<PAGE>

registered  in  Agouron's  name or in the name of such  nominee  as
Agouron  may  specify  and,  when  issued in  accordance  with the terms of this
Agreement  for the  consideration  expressed  herein,  will be duly  authorized,
validly  issued,  fully paid,  nonassessable  and free and clear of any liens or
encumbrances  caused or  created by the  Company  (except  that such  Restricted
Common Stock of the Company will be subject to  restrictions  on transfer  under
federal and applicable state securities laws).

2.     REPRESENTATIONS

       2.01  REPRESENTATIONS OF THE COMPANY. The Company represents and warrants
as follows:

                  (a) The  Company  is a  corporation  duly  organized,  validly
                  existing and in good  standing  under the laws of the State of
                  Delaware and has all requisite  power and authority  which are
                  necessary to own and operate its business and  properties  and
                  to carry on its business as it is being conducted. The Company
                  is duly  licensed and  qualified  and in good  standing in the
                  State of California and in such other  jurisdictions  in which
                  the  ownership  or lease of  property  or the  conduct  of its
                  business makes such licensing or qualification necessary.

                  (b) There are no  proceedings  pending or, to the knowledge of
                  the Company,  threatened  against or affecting  the Company in
                  any court or before any  governmental  authority  or agency or
                  arbitration board or tribunal which involve the possibility of
                  materially and adversely  affecting the properties,  business,
                  prospects  or  condition   (financial  or  otherwise)  of  the
                  Company.

                  (c) The issuance and sale of the  Restricted  Common Stock and
                  compliance  by the Company with all of the  provisions of this
                  Agreement are within the  corporate  powers of the Company and
                  have been duly  authorized by all proper  corporate  action on
                  the part of the  Company  and will  not (i)  conflict  with or
                  result  in any  breach  of any of  the  terms,  conditions  or
                  provisions  of, or  constitute a default under the Articles of
                  Incorporation  of the  Company or the  Bylaws of the  Company,
                  (ii)  conflict  with or  result  in any  breach  of any of the
                  terms,  conditions or  provisions  of, or constitute a default
                  under or give any party the right to terminate  or  accelerate
                  performance  under any other  agreement or instrument to which
                  the Company is a party (iii)  require  consent under any other
                  contract to which the  Company is a party,  (iv) result in the
                  creation or imposition of any lien, charge or encumbrance upon
                  any property or assets of the Company pursuant to the terms of
                  any  other  contract  to which the  Company  is a party or (v)
                  conflict  with  any  provision  of  any  applicable  judgment,
                  decree,  order,  statute,  rule, or regulation of any court or
                  any public,  governmental or regulatory  agency or body having
                  jurisdiction over the Company.

                  (d) This  Agreement  is a valid and binding  agreement  of the
                  Company and is  enforceable  against the Company in accordance
                  with the terms hereof,  except as such  enforceability  may be
                  affected by applicable bankruptcy laws and equitable remedies.
<PAGE>

                  (e) The  authorized  capital stock of the Company  consists of
                  5,000,000  shares of  preferred  stock  (preferred  stock) and
                  40,000,000 shares of common stock. As of the date hereof,  200
                  shares  of  its  Series  F  Convertible  Preferred  Stock  are
                  outstanding.  This preferred stock is convertible  into common
                  stock initially at a conversion price equivalent to $14.07 per
                  share of common stock. If the Company's  common stock does not
                  trade at prices  higher than $14.07 per share over a period of
                  time, the conversion price will be adjusted  downward on April
                  24, 1999 (or sooner if the Company issues common stock at less
                  than $14.07 per share) and quarterly thereafter. As of June 9,
                  1998,   22,900,350   shares   of  voting   common   stock  are
                  outstanding.  As of the date hereof,  4,497,749  stock options
                  issued  pursuant to the  Company's  stock option plans and two
                  (2) warrants to purchase a total of 2,051,281 shares of voting
                  stock are outstanding.  Up to 6,180,000 shares of common stock
                  may be issued under the Company's  stock option plans.  Except
                  as set  forth  above,  there are no other  options,  warrants,
                  conversion  privileges,  preemptive rights, or rights of first
                  refusal  granted by the  Company in favor of any other  person
                  presently  outstanding  or in existence to purchase or acquire
                  any  of  the  authorized  but  unissued  Common  Stock  of the
                  Company, other than any of such items granted pursuant to this
                  Agreement. The Company has provided to Purchaser copies of its
                  currently in effect Articles of Incorporation and Bylaws,  its
                  Form  10-K for the year  ended  December  31,  1997,  its 1997
                  Annual Report,  its Proxy  statement  dated April 27, 1998 and
                  its Form  10-Q for the  quarter  ended  March  31,  1998.  The
                  Company  warrants  that  the  information  contained  in  such
                  documents as updated and supplemented prior to the date of the
                  Closing is true and correct and when taken as a whole does not
                  omit  a fact  necessary  to  make  the  information  contained
                  therein in light of the circumstance under which the documents
                  were made (taking into account,  without limitation,  the type
                  of  transaction   contemplated   by  this  Agreement  and  the
                  sophistication  and nature of the Purchaser),  not misleading.
                  The Company  acknowledges that the Purchaser is relying on the
                  written documentation  provided by the Company to Purchaser as
                  described  above  in  making  its  decision  to  purchase  the
                  Restricted Common Stock.

                  (f) Since March 31, 1998, except for the sale of 200 shares of
                  Series F Convertible  Preferred  Stock for $10 million,  there
                  has not been any change in the assets, liabilities,  financial
                  condition or  operations  of the Company other than changes in
                  the ordinary course of business, none of which individually or
                  in the aggregate  have had a material  adverse  affect on such
                  assets, liabilities,  financial condition or operations of the
                  Company.

       2.02  REPRESENTATIONS  OF THE  PURCHASER.  The Purchaser  represents  and
warrants as follows:

                  (a) It is the intent of the Purchaser that its purchase of the
                  Restricted  Common Stock  contemplated by this Agreement shall
                  constitute a transaction  exempt from  registration  under the
                  Securities Act of 1933, as amended (the "Securities  Act") and
                  any applicable state securities laws.
<PAGE>

                  (b)  Purchaser  will not offer or sell any  Restricted  Common
                  Stock except pursuant to an effective  registration  statement
                  under  the  Securities  Act or in  transactions  which  do not
                  require registration under the Securities Act.

                  (c)  Purchaser is a  corporation  duly  organized  and validly
                  existing  under the laws of the State of California is in good
                  standing  under  such  laws  and has all  requisite  corporate
                  powers and authority to enter into this Agreement.

                  (d) On or prior to the date of the initial Closing,  Purchaser
                  will have taken all action  necessary  for the  authorization,
                  execution, delivery and performance of this Agreement.

                  (e) Purchaser has (i) reviewed this Agreement, and the written
                  statements, and documents, delivered to Purchaser as described
                  in Section 2.01(e);  and, (ii) received  satisfactory response
                  from the  Company  as to matters  about  which  Purchaser  has
                  inquired  relating  to this  Agreement,  and  other  documents
                  described  in Section  2.01(e) and  relating to the  Company's
                  business  condition,  prospects  and  plans  as  necessary  to
                  evaluate  the merits  and risks of  acquiring  the  Restricted
                  Common   Stock.   Purchaser  has  informed  the  Company  that
                  Purchaser is relying on all such  information and documents in
                  making its decision to purchase the Restricted Common Stock.

                  (f) Purchaser (i) has had the risks involved in the investment
                  represented  by this Agreement  explained;  (ii) has knowledge
                  and  experience in financial and business  matters to evaluate
                  the merits  and risks of the  investment  represented  by this
                  Agreement;  (iii)  is able to bear  the  economic  risk of the
                  investment represented by this Agreement (including a complete
                  loss of this  investment);  and (iv) has determined  that this
                  investment is suitable for  Purchaser in light of  Purchaser's
                  financial     circumstances    and    available     investment
                  opportunities.

                  (g) Purchaser is acquiring the Restricted Common Stock for its
                  own  account  and with its  general  assets for the purpose of
                  investment  and not  with a view to the  resale,  transfer  or
                  distribution thereof, and has no present intention of selling,
                  transferring,   negotiating  or  otherwise  disposing  of  any
                  Restricted  Common  Stock.  Notwithstanding  anything  in this
                  Agreement  to the  contrary,  it is agreed that the  Purchaser
                  shall  have the  right to assign or  transfer  the  Restricted
                  Common Stock to its Affiliates at any time without the consent
                  of the Company.

3.  NON-DISCLOSURE.  Except as agreed to by the parties  neither the Company nor
the Purchaser  shall release any  information to any third party with respect to
any of the terms of this  Agreement  without  the prior  written  consent of the
other,  which  consent  shall not  unreasonably  be withheld.  This  prohibition
includes,  but is not limited to,  press  releases,  promotional  materials  and
discussions with the media. If the Company determines that it is required by law
to release information to any third party regarding the terms of this Agreement,
it shall notify the Purchaser of this fact prior to releasing  the  information.
The notice to the Purchaser shall include the text of the  information  proposed
for  release.  The  Purchaser  shall 
<PAGE>

have the right to confer with the Company  regarding  the necessity for the
disclosure and the text of the information proposed for release.

4.     COMPLIANCE WITH SECURITIES ACT

       4.01 CERTAIN DEFINITIONS.  As used herein, the following terms shall have
the following respective meanings:

                  (a)  COMMISSION.   Shall  mean  the  Securities  and  Exchange
                  Commission,   or  any  other   Federal   agency  at  the  time
                  administering  the Securities Act or the Trust  Indenture Act,
                  as the case may be.

                  (b) SECURITIES  ACT. Shall mean the Securities Act of 1933, as
                  amended,  or any similar  Federal  statute,  and the rules and
                  regulations  of the  Commission  thereunder,  all as the  same
                  shall be in effect at the relevant time.

                  (c) EXCHANGE ACT.  Shall mean the  Securities  Exchange Act of
                  1934,  as amended,  or any similar  Federal  statute,  and the
                  rules and regulations of the Commission thereunder, all as the
                  same shall be in effect at the relevant time.

                  (d)  RESTRICTED  COMMON STOCK.  Shall mean the Common Stock of
                  the Company issued and sold pursuant to this  Agreement  which
                  by the terms  hereof is required to bear the legend  specified
                  in Section 4.02 hereof.

       4.02 RESTRICTION OF TRANSFERABILITY;  LEGEND. Shares of Restricted Common
Stock shall not be resold or transferred  unless registered under the Securities
Act or unless an  exemption  from  registration  is  available  for such sale or
transfer.  The conditions specified below are intended to ensure compliance with
the provisions of the  Securities Act in respect of any transfer of stock.  Each
certificate for shares of Restricted  Common Stock shall be stamped or otherwise
imprinted with a legend in substantially the following form:

                           The shares  evidenced  by this  certificate  have not
                           been registered  under the Securities Act of 1933, as
                           amended,  and may not be sold or  transferred  in the
                           absence  of  such   registration   or  an   exemption
                           therefrom  under said Securities Act and the transfer
                           of such  shares is  subject  to terms and  conditions
                           specified  in the  Common  Stock  Purchase  Agreement
                           dated as of June 11,  1998,  between  the Company and
                           Agouron Pharmaceuticals, Inc.

If shares of Restricted Common Stock evidenced by certificates  bearing a legend
required  by this  Section  4.02  are  sold in  accordance  with a  registration
statement which has become effective under the Securities Act, or if the Company
shall  receive an opinion of its counsel to the effect that any legend  required
under this  Section  4.02 is not, or is no longer,  necessary  or required  with
respect  to  such  shares  (including,   without  limitation,   because  of  the
availability  of the  exemption  afforded by Rule 144 of the  General  Rules and
Regulations  of the  Commission),  the  Company  shall,  or shall  instruct  its
transfer  agent and registrar  to, remove such legend or issue new  certificates
without such legend in lieu thereof.
<PAGE>

       4.03   INFORMATION REQUIREMENTS.  The Company agrees to:

                  (a) Make and keep public information  available,  as such term
                  is  understood  and  defined in  Commission  Rule 144 and Rule
                  144A, under the Securities Act;

                  (b) Use its best  efforts  to file  with the  Commission  in a
                  timely manner all reports and other documents  required of the
                  Company under the Securities Act and the Exchange Act; and

                  (c) Furnish to any holder of Restricted Common Stock a copy of
                  the most recent annual or quarterly report of the Company, and
                  such other  publicly  available  reports and  documents of the
                  Company,  so that such holder may avail  itself of any rule or
                  regulation  of the  Commission  allowing  it to sell  any such
                  securities without registration.

       4.04 PIGGY-BACK  REGISTRATION  RIGHTS.  If the Company before January 15,
2001  contemplates  a  public  offering  of  shares  of its  Common  Stock to be
registered  under the Securities  Act, the Company shall so notify the Purchaser
in writing of its  intention  to do so, at least  twenty  (20) days prior to the
filing of a registration statement for such offering. If Purchaser gives written
notice to the  Company,  within ten (10) days of receipt of the notice  from the
Company,  of Purchaser's  desire to have its Restricted Common Stock included in
such  registration  statement,  Purchaser may, subject to the provisions of this
Section 4.04,  have its Restricted  Common Stock  included in such  registration
statement.   The  Company  shall  bear  all  expenses  in  connection  with  the
registration and sale of any such Restricted  Common Stock,  other than the fees
or  disbursements  of any  special  counsel  which the  Purchaser  may retain in
connection with the  registration of its Restricted  Common Stock or any portion
of the  underwriter's  commission,  discounts and expenses  attributable  to the
Restricted Common Stock being offered and sold by the Purchaser. Notwithstanding
the foregoing,  if the managing underwriter of any such offering determines that
the number of shares proposed to be sold by the Company,  by other  shareholders
having piggy-back rights,  and/or by the Purchaser is greater than the number of
shares which the underwriter believes feasible to sell at the time, at the price
and upon the terms approved by the Company,  then the number of shares which the
underwriter  believes  may be sold  shall  be  allocated  for  inclusion  in the
registration  statement in the  following  order of  priority:  (i) shares being
offered by the Company;  and (ii) pro rata among the other  shareholders and the
Purchaser,  based on the  number  of shares of  Common  Stock  each  shareholder
requested to be  registered.  The Company  shall have the right to designate the
managing  underwriter in respect of a public  offering  pursuant to this Section
4.04.

       4.05       ADDITIONAL COVENANTS CONCERNING SALE OF SHARES.

                  (a) The Company will notify the Purchaser of the effectiveness
                  of any registration statement in which Purchaser has exercised
                  registration  rights granted  pursuant to the terms of Section
                  4.04,  together  with a list of the  jurisdictions  where  the
                  Company has  qualified  or is exempt from  registration  under
                  applicable state securities laws.
<PAGE>

                  (b) The Company will prepare and file with the Commission such
                  amendments and supplements to any registration statement filed
                  pursuant to the terms of Section 4.04 (and any prospectus used
                  in  connection  with such  registration  statement)  as may be
                  necessary to comply with the  provisions of the Securities Act
                  with  respect to the sale of  Restricted  Common  Stock by the
                  Purchaser.

                  (c) The Company  will  furnish to the  Purchaser a  reasonable
                  number of copies of the prospectus  used in connection  with a
                  registration  statement filed pursuant to the terms of Section
                  4.04,  including a preliminary  prospectus,  which  prospectus
                  conforms to the  requirements  of the Securities Act, and such
                  other  documents as the Purchaser may reasonably  request,  in
                  order  to  facilitate  the   disposition  of  the  Purchaser's
                  Restricted Common Stock.

                  (d) In connection with any registration  statement referred to
                  in Section 4.04 of this  Agreement,  Purchaser will furnish to
                  the Company  such  information  as the Company may  reasonably
                  require  from  Purchaser  for  inclusion  in the  registration
                  statement (and the prospectus included therein).

                  (e) The  Company's  obligations  under  Section  4.04 shall be
                  conditioned  upon  Purchaser  executing and  delivering to the
                  Company its agreement,  in a form  satisfactory to counsel for
                  the  Company,   that  it  will  comply  with  all   applicable
                  provisions  of the  Securities  Act,  the  Exchange  Act,  the
                  securities  acts  of  applicable  states  and  any  rules  and
                  regulations  promulgated  under such acts and will  furnish to
                  the  Company  information  about  sales  made in  such  public
                  offering.

       4.06       INDEMNIFICATION

         In the  event  any of the  Restricted  Common  Stock  of  Purchaser  is
included in a registration statement under Section 4.04 of this Agreement:

                  (a) To the extent permitted by law, the Company will indemnify
                  and hold harmless the Purchaser and its  Affiliates  and their
                  respective  officers,  directors  and  employees,  against any
                  losses, claims,  damages, or liabilities (joint or several) to
                  which they may become  subject under the  Securities  Act, the
                  Exchange  Act or other  federal or state law,  insofar as such
                  losses, claims, damages, or liabilities (or actions in respect
                  thereof)  arise out of or are based upon any of the  following
                  statements,  omissions or  violations  (hereinafter  sometimes
                  collectively referred to as a "Violation(s)"):  (i) any untrue
                  statement  or alleged  untrue  statement  of a  material  fact
                  contained  in  such  registration  statement,   including  any
                  preliminary  prospectus or final prospectus  contained therein
                  or any amendments or supplements thereto; (ii) the omission or
                  alleged  omission to state therein a material fact required to
                  be stated therein, or necessary to make the statements therein
                  not misleading; or (iii) any violation or alleged violation by
                  the Company of the Securities Act, the Exchange Act, any state
                  securities law or any rule or regulation promulgated under the
                  Securities Act, the Exchange Act or any state  securities law;
                  and the Company will
<PAGE>

                  reimburse each such indemnified party for
                  any  legal  or other  expenses  reasonably  incurred  by it in
                  connection  with  investigating  or  defending  any such loss,
                  claim, damage,  liability or action;  provided,  however, that
                  the indemnity  agreement  contained in this Section 4.06 shall
                  not apply to  amounts  paid in  settlement  of any such  loss,
                  claim,  damage,  liability  or  action if such  settlement  is
                  effected  without the consent of the  Company  (which  consent
                  shall not be unreasonably withheld or delayed),  nor shall the
                  Company be liable in any such case for any such  loss,  claim,
                  damage,  liability  or action to the extent that it arises out
                  of or is based upon a Violation which occurs in reliance upon,
                  and  in  conformity  with,   written   information   furnished
                  expressly for use in connection with such registration, by any
                  such indemnified party.

                  (b) To  the  extent  permitted  by  law,  the  Purchaser  will
                  indemnify and hold harmless the Company and its Affiliates and
                  their respective officers, directors and employees against any
                  losses, claims,  damages, or liabilities (joint or several) to
                  which they may become  subject under the  Securities  Act, the
                  Exchange  Act or other  federal or state law,  insofar as such
                  losses, claims, damages, or liabilities (or actions in respect
                  thereof)  arise out of or are based  upon any  Violations,  in
                  each case to the  extent  (and only to the  extent)  that such
                  Violation  occurs in reliance  upon,  and in conformity  with,
                  written  information   furnished  by  the  Purchaser  and  its
                  Affiliates  and  their  respective  officers,   directors  and
                  employees to the Company  expressly for use in connection with
                  such registration;  and the Purchaser will reimburse each such
                  indemnified  party for any legal or other expenses  reasonably
                  incurred by it in connection with  investigating  or defending
                  any such loss, claim, damage,  liability or action;  provided,
                  however,  that  the  indemnity  agreement  contained  in  this
                  Section 4.06 shall not apply to amounts paid in  settlement of
                  any such  loss,  claim,  damage,  liability  or action if such
                  settlement is effected  without the consent of the  Purchaser,
                  which consent shall not be unreasonably withheld or delayed.

                  (c) Promptly after receipt by an indemnified  party under this
                  Section  4.06 of  notice  of the  commencement  of any  action
                  (including any governmental  action),  such indemnified  party
                  will, if a claim in respect  thereof is to be made against the
                  indemnifying   party  under  this  Section  4.06,  notify  the
                  indemnifying party in writing of the commencement  thereof and
                  the indemnifying party shall have the right to participate in,
                  and,  to the  extent the  indemnifying  party so  desires,  to
                  assume the defense thereof with counsel mutually  satisfactory
                  to the parties.

5.     MISCELLANEOUS

       5.01 EXPENSES;  FINDERS FEES. Neither party shall pay expenses and finder
fees for or to the other in connection with this transaction.  Each party agrees
to  indemnify  and hold the other  party  harmless  from any  liability  for any
commission  or  compensation  in the nature of a  finder's  fee to any broker or
other person (and the costs and expenses of defending  against such liability or
asserted liability) claiming to have been hired or engaged by the party.

       5.02  REPLACEMENT  OF  CERTIFICATES  FOR  RESTRICTED  COMMON STOCK.  Upon
receipt by the Company of evidence  reasonably  satisfactory  to it of the loss,
theft,  destruction or mutilation of
<PAGE>

any certificate  evidencing any Restricted  Common Stock,  the Company will
execute,  register and deliver,  in lieu thereof, a new certificate for an equal
number of shares  of  Restricted  Common  Stock.  In the case of loss,  theft or
destruction of a certificate,  at the election of the Company, the Purchaser may
be required to provide an indemnity reasonably satisfactory to the Company or to
post a surety bond in an amount equal to the value of the shares  represented by
the new certificate.

       5.03  NOTICE.  Any notice  required  to be given  under the terms of this
Agreement  shall be in  writing,  and shall be given in person,  transmitted  by
telecopier,   e-mail  or  similar  electronic  communication,   delivered  by  a
recognized  overnight  delivery  service such as Federal Express or sent by mail
(certified or  registered  or air mail for  addresses  outside of the country of
origin), return receipt requested,  postage prepaid and addressed to the Company
at 5935 Darwin Court,  Carlsbad,  California 92008, or such other address as the
Company may  designate  to  Purchaser  in writing and to the  Purchaser,  at the
address  appearing at the  beginning of this  Agreement or such other address as
Purchaser may designate to the Company in writing.  Except as otherwise provided
herein,  any notice so given shall be deemed  delivered  upon the earlier of (i)
actual receipt;  (ii) receipt by sender of confirmation if telecopied or sent by
e-mail or  similar  electronic  communication;  (iii) two  business  days  after
delivery to such overnight  delivery  service;  or (iv) five business days after
deposit in the mail.

       5.04  SUCCESSORS AND ASSIGNS.  This  Agreement  shall be binding upon the
parties and their respective successors and assigns.

       5.05 SURVIVAL OF REPRESENTATIONS, ETC. All covenants, representations and
warranties  made by the  parties  herein  shall  survive  the  Closings  and the
delivery of this Agreement and the shares of Restricted  Common Stock  purchased
hereunder.

       5.06 TERMINATION.  Purchaser's  obligation to purchase  Restricted Common
Stock  under  this  Agreement  shall  terminate  with  respect  to any  purchase
obligations  whose purchase dates under Paragraph 1.02 occur after Purchaser has
elected to terminate, in its entirety, all of Purchaser's rights and obligations
under the  Letter of  Intent  ("LOI")  dated  June 11,  1998 and the  Definitive
Agreement (as defined in the LOI) between the parties.

       5.07  SEVERABILITY.  Should any part of this  Agreement for any reason be
declared  invalid,  such decision shall not affect the validity of any remaining
portion,  which  remaining  portion  shall remain in force and effect as if this
Agreement had been executed with the invalid portion  thereof  eliminated and it
is hereby  declared  the  intention  of the parties  hereto that they would have
executed the remaining  portion of this Agreement  without including therein any
such part,  parts, or portion which may, for any reason,  be hereafter  declared
invalid.

       5.08  GOVERNING  LAW. This  Agreement  shall be construed and enforced in
accordance  with,  and governed by, the laws of the State of California  without
regard to its conflict of law provisions.

       5.09 CAPTIONS,  FORM OF PRONOUNS. The descriptive headings of the various
sections  or parts of this  Agreement  are for  convenience  only and  shall not
affect the meaning or construction of any of the provisions hereof. All pronouns
used in this Agreement shall be deemed to include masculine, feminine and neuter
forms.
<PAGE>

       5.10 AGREEMENT IS ENTIRE CONTRACT.  This Agreement constitutes the entire
contract  between  the  parties  hereto  related  to the  purchase  and  sale of
Restricted  Common  Stock and no party  shall be liable or bound to the other in
any  manner  by  any  warranties,   representations   or  covenants   except  as
specifically set forth herein.

       5.11 THIRD PARTIES.  Nothing in this Agreement is intended to confer upon
any  party,  other  than the  parties  hereto,  and their  respective  permitted
successors and assigns, any rights, remedies,  obligations, or liabilities under
or by reason of this Agreement, except as expressly provided herein.

       5.12 AMENDMENT AND WAIVER. Any provision of this Agreement may be amended
and the  observance of any term hereof may be waived  (either  prospectively  or
retroactively  and either  generally or in a particular  instance) only with the
written consent of the Company and the Purchaser.

       5.13  AFFILIATES.  References  to  Purchaser in this  Agreement  shall be
deemed to  include  direct  or  indirect  subsidiaries  of  Purchaser.  The term
"Affiliate" shall have the meaning defined in the LOI.

       5.14 DISPUTE RESOLUTION. In the event of any controversy or claim arising
out of or relating to any provision of this Agreement,  the parties shall try to
settle their differences  amicably between  themselves.  Any unresolved disputes
arising between the parties  relating to, arising out of or in any way connected
with this  Agreement  or any term or condition  hereof,  or the  performance  by
either party of its obligations  hereunder,  whether before or after termination
of this Agreement, shall be finally resolved by binding arbitration.  Whenever a
party shall decide to institute arbitration  proceedings,  it shall give written
notice to that effect to the other  party.  The party  giving such notice  shall
refrain from instituting the arbitration  proceedings for a period of sixty (60)
days  following  such  notice  The  arbitration  shall  be  held  in San  Diego,
California  according  to the  rules  of the  American  Arbitration  Association
("AAA")  applicable  to  commercial  securities  matters  of  this  nature.  The
arbitration  shall be  conducted  by a panel of three  arbitrators  appointed in
accordance  with AAA rules;  provided,  however,  that each party  shall  within
thirty (30) days after the  institution of the arbitration  proceedings  appoint
one  arbitrator  with  the  third  arbitrator  being  chosen  by the  other  two
arbitrators.  If only one party  appoints an  arbitrator,  then such  arbitrator
shall be entitled to act as the sole arbitrator to resolve the controversy.  Any
arbitration  hereunder  shall  be  conducted  in the  English  language  and the
arbitrator(s)  shall apply the law set forth in Section 5.08. All  arbitrator(s)
eligible to conduct the arbitration must agree to render their opinion(s) within
thirty (30) days of the final arbitration  hearing. The arbitrator(s) shall have
the  authority  to grant  injunctive  relief and  specific  performance,  and to
allocate  between the parties the costs of arbitration in such equitable  manner
as he determines;  provided,  however,  that each party shall bear its own costs
and  attorney's  and witness'  fees.  Notwithstanding  the terms of this Section
5.14,  a party  shall also have the right to obtain  prior to the  arbitrator(s)
rendering the arbitration  decision,  provisional  remedies including injunctive
relief or specific  performance from a court having  jurisdiction  thereof.  The
arbitrator(s) will, upon the request of either party, issue a written opinion of
the findings of fact and  conclusions of law and shall deliver a copy to each of
the parties. Decisions of the arbitrator(s) shall be final and binding on all of
the  parties.  Judgment  on the award so  rendered  may be  entered in any court
having jurisdiction thereof.
<PAGE>

       The execution  hereof by Purchaser shall constitute a contract between us
for the uses and  purposes  hereinabove  set forth,  and this  Agreement  may be
executed in any number of counterparts,  each executed counterpart  constituting
an original but all together only one agreement.

                                        THE IMMUNE RESPONSE CORPORATION


                                        By /S/ DENNIS J. CARLO


                                        By /S/ CHARLES J. CASHION



ACCEPTED AND AGREED TO AS OF THE DAY AND YEAR AFORESAID.

                                        PURCHASER:
                                        AGOURON PHARMACEUTICALS, INC


                                        By /S/ PETER JOHNSON
                                        Peter Johnson
                                        President and Chief Executive Officer


                                        By /S/ GARY FRIEDMAN
                                        Gary Friedman
                                        Secretary




                                                       


                                                                 EXHIBIT 10.24
   PORTIONS OF THIS DOCUMENT HAVE BEEN OMITTED (DESIGNATED BY AN ASTERISK (*)
     AND WHITE SPACE) AND FILED SEPARATELY WITH THE SECURITIES AND EXCHANGE
           COMMISSION PURSUANT TO A REQUEST FOR CONFIDENTIAL TREATMENT
                     DATED AUGUST 4, 1998; FILE NO. 0-15609

        AMENDMENT TO THE VIRACEPT (NELFINAVIR MESYLATE) LICENSE AGREEMENT

         This  Amendment  ("Amendment")  to the VIRACEPT  (Nelfinavir  Mesylate)
License Agreement ("the  Agreement"),  effective as of this 1st day of May, 1998
("Effective Date"), is between Agouron Pharmaceuticals, Inc., a corporation duly
organized  and  existing  under  the laws of the state of  California,  having a
principal  place of  business  at 10350  North  Torrey  Pines  Road,  La  Jolla,
California,  United States of America  (hereinafter  referred to as  "Agouron"),
Japan Tobacco Inc., a corporation  duly organized and existing under the laws of
Japan,  having its principal  place of business at JT Building,  2-1,  Toranomon
2-chome,  Minato-ku,  Tokyo,  Japan  (hereinafter  referred to as "JT"),  and F.
Hoffmann-La  Roche Ltd, a corporation duly organized and existing under the laws
of  Switzerland,  having  its  principal  place of  business  at  CH-4002-Basel,
Switzerland (hereinafter referred to as "Roche"). Agouron, JT and Roche are each
sometimes hereinafter referred to as a party (collectively "parties").
The parties for good and valuable consideration hereby agree as follows:

                                    RECITALS

1.       BACKGROUND

         1.01 All  capitalized  terms,  except as  expressly  otherwise  defined
herein, shall have the meanings set forth in the Agreement.

         1.02  Agouron,  JT and Roche entered into a Letter of Intent on January
17, 1997 and the VIRACEPT  (nelfinavir  mesylate)  License  Agreement  dated for
reference  purposes only June 30, 1997, under which Agouron and JT granted,  and
Roche received, a license in the Licensed Territory to use, offer for sale, sell
and/or import Products in the Field under  applicable  Agouron/JT  Patent Rights
and  Development   Program  Patent  Rights  and  using   applicable   Agouron/JT
Technology, Roche Technology and Development Program Technology.

         1.03 Roche has certain  capacities to  manufacture  Compound as well as
formulate  Product.  Roche  has  informed  Agouron  and  JT  of  its  desire  to
manufacture  Compound and formulate Product to be sold and/or distributed in the
Licensed    Territory   with   such   Roche    manufacturing   and   formulating
responsibilities to be phased-in over an agreed-to period of time.

         1.04 The parties,  in accordance with the provisions of Section 4.04(f)
of the Agreement,  have discussed in good faith an arrangement under which Roche
could be the  manufacturer  of Compound and the formulator of Product to be sold
and/or distributed in the Licensed Territory.

         1.05 Agouron and JT under certain conditions are willing to grant Roche
certain rights to manufacture  Compound and formulate  Product to be sold and/or
distributed in the Licensed Territory.
<PAGE>

         1.06 Since  Roche's  assumption of the  responsibility  for meeting its
requirements of Compound and Product in the Licensed Territory over the phase-in
period  will  impact the amount and timing of  Agouron's  and JT's  current  and
future  requirements  for  Compound and Product,  their  arrangements  with toll
manufacturers for the manufacture of such Compound and Product and their ability
to  provide  Compound  and  Product to Roche in the  future,  the  parties  have
discussed and agreed upon a schedule under which Agouron and JT will be relieved
of any  responsibility  they have under Section 4.04 of the Agreement to provide
Roche with  Compound  and Product;  Agouron and JT have  indicated to Roche that
under certain  circumstances they are willing to use their reasonable efforts to
supply Roche with Product after the end of such phase-in period.

         1.07  Roche has developed and owns  certain   technology  used  in  the
manufacture of saquinavir, however formulated ("SAQUINAVIR") which if converted,
applied and  scaled-up by Roche*,  could * of Compound as a result of applying *
to a new more cost-efficient method of * for making the Compound to be developed
by Roche. Roche,*


         1.08 To effect  the  preceding  and  clarify  the  parties'  rights and
obligations  under the  Agreement,  the parties  wish to amend the  Agreement as
provided below.


                                    AMENDMENT

2.       GRANT OF RIGHTS TO ROCHE

         2.01 Agouron and JT grant Roche and its Affiliates listed in Attachment
1 hereto,  the non-exclusive  right anywhere in the Territory (without the right
to  sublicense),  under  applicable  Agouron/JT  Patent  Rights and  Development
Program Patent Rights and using applicable Agouron/JT Technology and Development
Program  Technology,  to internally  manufacture*  Roche's  requirements of
Compound using* . Except as provided by Article 3, Roche shall have the right to
* needed for the manufacture of Compound from third party suppliers.

         2.02 Agouron and JT grant Roche and its Affiliates listed in Attachment
1 hereto,  the non-exclusive  right anywhere in the Territory (without the right
to  sublicense),  under  applicable  Agouron/JT  Patent  Rights and  Development
Program Patent Rights and using applicable Agouron/JT Technology and Development
Program  Technology,  to * in the Licensed  Territory.  Notwithstanding the
preceding, Roche shall have the right* 

<PAGE>


         2.03  Except as  otherwise  provided in the  Agreement,  Roche shall be
entitled to manufacture  Compound unless:  (i) the  prerequisite  requirement of
Section  4.04(f) of the Agreement is not satisfied on the second  anniversary of
the Effective Date (i.e.  Roche's FBMC for such Product is more than the FBMC of
alternative  sources for such  Product);  and (ii)  Agouron and JT  subsequently
elect in  writing  to resume  their  responsibility  under  Section  4.04 of the
Agreement to provide  Compound to Roche and are able to directly or  indirectly,
fully satisfy Roche's  projected  needs for Compound;  Agouron's and JT's supply
obligations for Compound under Section 4.04 of the Agreement shall be reinstated
upon the resumption by Agouron and JT of such responsibility.

         2.04 Except as otherwise specifically provided in the Agreement, Roche
shall continue to be entitled to formulate Product to be sold and/or distributed
in the  Licensed  Territory  until * after the cost of Product to be sold and/or
distributed by Agouron or JT in their respective marketing territories * Agouron
and/or JT also been  responsible  for the  formulation  of Product for Roche and
Agouron and JT  subsequently  * under  Section 4.04 of the  Agreement to provide
such Product to Roche and have the ability, directly or indirectly, * determined
pursuant  to the  provisions  of  Section  4.04(b)  of  the  Agreement  for  the
applicable  jurisdiction in which such Product will be sold;  Agouron's and JT's
supply  obligations  for Product under  Section 4.04 of the  Agreement  shall be
reinstated  upon  the  resumption  by  Agouron  and JT of  such  responsibility.
Notwithstanding  Agouron's  and/or  JT's  election  described  in the  preceding
sentence, Roche shall be entitled to elect to continue to formulate Product if *
of Product to be sold and/or  distributed  by Agouron or JT in their  respective
marketing territories.  Additionally, Roche shall also be entitled to * Product.
Roche shall also continue to be entitled to formulate  Product to be sold and/or
distributed  in a  country(s)  located in the  Licensed  Territory  * to be sold
and/or distributed in such country(s).

          2.05 All licenses granted Roche in this Amendment in a country shall
become * in such country in accordance  with the  provisions of Section 5.02(j)
of the Agreement.

         2.06 Roche  shall not have the right to use the  applicable  Agouron/JT
Patent Rights and  Development  Program Patent Rights and applicable  Agouron/JT
Technology  and  Development  Program  Technology for any purpose other than the
manufacture  of  Compound  and/or the  formulation  of Product to be sold and/or
distributed in the Licensed Territory.


<PAGE>



 3.     LIMITATIONS

     3.01 Roche's  rights to manufacture  Compound and formulate  Product shall*
Agouron's and JT's * and needs for the United States of America,  Canada, Japan,
North Korea and South Korea (including  Agouron's and JT's cost of Product to be
sold and/or  distributed  in such  countries)  * Agouron's  and JT's  existing *
Agouron and JT each  acknowledge  that Roche's  rights * Compound and  formulate
Product to be sold and/or distributed in the Licensed Territory shall not affect
such party's * of Compound and Product  provided that Roche * Agouron  and/or JT
as set forth in this  Amendment  and Schedule 2 thereto and to be * as set forth
in Paragraph 3.02 of this Amendment.

     3.02  Relations  with Schedule 1  Manufacturers  including*  and/or * .

     (a)  Roche  shall not  conduct  discussions  and/or  enter  into * for the 
* into the Compound) of Compound  (including*  ) and/or the  formulation  of 
Product with * listed on Schedule 1, including* and/or * . 
     
     (b) Agouron agrees* with Roche its * after calendar * with* and/or* for * 
into the Compound.  

     (c) Roche  acknowledges that  Agouron  has * Compound  at* and/or*  during
each of  calendar  years* in exchange for * . Since the* Roche, * Agouron's and 
JT's * plans * hereby agrees:(i)  during  the  period * to be  responsible  for 
the* each  month an amount of Compound  needed  to * listed  for such  month in 
line 3 of  Schedule  2 of this Amendment;  and  (ii)  during  the  period  * to 
be  responsible  for  the* ; in calculating Roche's responsibility during each 
* calendar 2000 for the * in line 4 of Schedule 2 of this Amendment. If during 
the period* . and/or *

<PAGE>

of  Agouron's  and/or  Roche's  Compound  during a* , the  capacity  of the
available * shall be  allocated  between  Agouron and Roche during such * on a *
basis,  based upon the  ratios of *  provided,  however,  in  calculating  the *
utilized by Roche during a * in line 4 of Schedule 2 of this Amendment  shall be
considered  to have been  utilized by Roche  during  such* . During the period *
Agouron  shall *  between  Agouron  and  Roche * which is in excess of * only if
there is* will Agouron use its reasonable efforts * of Compound. If Roche wishes
to* and/*  which is in excess of* , Roche shall so notify  Agouron.  Roche shall
keep  Agouron  informed  on a  regular  basis  about  Roche's  projected  future
requirements for* . 
     
     (d) If Agouron wishes to maintain * and/or* Roche agrees, as
provide  below,* at such  dedicated* ; provided,  however,  that before  Agouron
enters into such arrangement,  Agouron agrees to discuss with Roche the terms of
any such arrangement and to fully and completely confer in good faith with Roche
about alternative  arrangements thereto. If Agouron after such discussions* , of
Compound at such* ; notwithstanding the preceding,  Roche shall not be obligated
during * of Compound at such * , if it agrees to compensate  Agouron and JT for*
of:  (i)* of  Compound at such* , over (ii) * If after the end of * and/or * are
unable to * of Agouron  and/or  Roche's * the capacity of the available * (up to
the minimum 
<PAGE>


contracted  amount  of  Compound*  ) shall be * based  upon  the  following
ratios:  

     To Agouron = * 

     To Roche = * 

After the end of * Agouron  shall * between
Agouron  and Roche the*  and/or*  which is in excess of the  minimum  contracted
amount of Compound  during a* only if there is available * after  Agouron and JT
have * Agouron use its reasonable efforts to permit Roche to * . If Roche wishes
to * which is in excess of the* , Roche  shall so notify  Agouron.  Roche  shall
keep  Agouron  informed  on a  regular  basis  about  Roche's  projected  future
requirements*  . 

     3.03 Roche, * , shall conduct all activities it deems necessary
to * by applying certain existing technology used in the manufacture of * .

<PAGE>

4.      MARKUP

         4.01 For the rights  granted  pursuant to the  provisions of Paragraphs
2.01-2.04,  Roche  agrees  to pay  Agouron  and JT an  amount  equal to * on the
aggregate  FBMC of  Compound  manufactured  by Roche and Product  formulated  by
Roche.  Roche  shall  account  for and  pay  any  amounts  due  pursuant  to the
provisions of this Paragraph 4.01 because of the  manufacture of Compound and/or
formulation of Product by Roche in a calendar quarter in accordance with written
instructions  provided by Agouron and JT; such  payments  shall be included,  if
possible, with any royalty payments due Agouron and JT for such calendar quarter
pursuant to the provisions of Section  5.02(f) of the  Agreement.  The audit and
payment terms agreed upon by the parties for the audit of Agouron's  FBMC as set
forth in Section  4.04(c) of the  Agreement  and the payment of royalties as set
forth in Section 5.02(f) of the Agreement  shall be applied MUTATIS  MUTANDIS to
the  calculation  of Roche's FBMC and the payment of any amounts due Agouron and
JT.  Notwithstanding  the  preceding,  Roche may calculate and initially pay the
amount of quarterly  payments due pursuant to the  provisions of this  Paragraph
4.01 using an estimated standard cost for Compound and/or Product; to the extent
that there is a difference  in the  estimated  standard cost and actual cost for
Compound  and/or  Product  during a calendar  year Roche shall  recalculate  the
aggregate  amount due for such  calendar  year and the parties  shall settle any
difference in amount due by adjusting  the amount of royalty and other  payments
due for the calendar  quarter ending  December 31st of the  applicable  calendar
year.

5.     LICENSE GRANT TO AGOURON AND JT

        5.01 Roche  grants  Agouron  and JT the  non-exclusive  perpetual  right
anywhere in the Territory (without the right to sublicense),  to manufacture and
have  manufactured the Compound and  intermediates  thereof,  under Roche patent
rights  which  relate to  inventions  made solely by  employees of Roche and its
Affiliates during the development and implementation by Roche of a *

                  .

     5.02 For the rights granted  pursuant to the provisions of Paragraph  5.01,
Agouron  and JT agree  to  compensate  Roche  with an  amount  equal to * of the
reduction of Agouron's and JT's FBMC of Compound  which results from * described
in Paragraph  5.01 in the  manufacture of Compound and  intermediates  thereof *
that is available to Agouron and JT on the date of such manufacture, but only to
the extent  that * (in the absence of license  rights  granted  under  Paragraph
5.01) * owned by Roche (which * a non-appealable  order).  The audit and payment
terms  agreed upon  between the parties for the audit of  Agouron's  FBMC as set
forth in Section  4.04(c) of the  Agreement  and the payment of royalties as set
forth in Section 5.02(f) of the Agreement  shall be applied MUTATIS  MUTANDIS to
the * of Agouron's  and JT's FBMC and the payment of sums due Roche  pursuant to
the  provisions of this Paragraph  5.02.  
<PAGE>

     5.03  Agouron  and JT shall  not have the  right to use the  patent  rights
granted  pursuant to the provisions of Paragraph 5.01 for any purpose other than
to manufacture or have manufactured the Compound and intermediates thereof.

6.       EXCHANGE OF INFORMATION

     6.01 Immediately  after execution of this Amendment by the parties,  and on
an  ongoing  basis  thereafter,  Roche  shall  provide  to  Agouron  and  JT its
information  *  Compound.  Each party  shall  provide  the other  party with its
information  on its  manufacturing  processes  for  Compound  (including*  ) and
formulating  processes  for  Product,  to the extent  that such  information  is
necessary and useful for the manufacture of Compound and formulation of Product.
Such  information  shall  include data prepared for  notification  of regulatory
authorities about * (including * thereof);  for example, data contained in the *
                           .

7.     SUPPLY OBLIGATIONS

         7.01 Roche  acknowledges that its assumption of the  responsibility for
meeting its requirements of Compound and Product in the Licensed  Territory over
the phase-in period described in Schedule 2 will impact the amount and timing of
Agouron's  and JT's  current and future  requirements  for Compound and Product,
their  arrangements with toll manufacturers for the manufacture of such Compound
and Product and their  ability to provide  Compound  and Product to Roche in the
future.  The parties,  as noted below,  have agreed upon a schedule  under which
Agouron and JT will be relieved of any  responsibility  they have under  Section
4.04 of the Agreement to provide Roche with Compound and finished dosage form(s)
of Product after the dates specified below.

         7.02 Except as provided in Schedule 2, Roche agrees that Agouron and JT
will be  relieved  of any  responsibility  they have under  Section  4.04 of the
Agreement  to  provide  Roche with  Compound  after the  Effective  Date of this
Amendment. Notwithstanding the preceding, to the extent Roche wishes to purchase
from  Agouron and JT all or a part of its  requirements  of  Compound  after the
Effective Date of this Amendment,  Agouron and JT agree to use their  reasonable
efforts  to supply  such  Compound  to Roche at the  price set forth in  Section
4.04(b)  of  the  Agreement.  Provided,  however,  that  the  provisions  of the
immediately  preceding sentence shall not obligate Agouron and/or JT to allocate
their available  supply of Compound between the parties after the Effective Date
of this  Amendment in order to supply such  Compound to Roche;  only if there is
available  supply of Compound  after Agouron and JT have  satisfied the needs in
their marketing territories,  will Agouron and JT's have to use their reasonable
efforts to supply Compound to Roche.

     7.03 Agouron's and JT's responsibility under the Agreement to provide Roche
Product are amended as follows:
<PAGE>
     (a) Except as provided in Schedule 2, Roche agrees that Agouron and JT will
be * they have under Section 4.04 of the Agreement * Roche * ; provided however,
for purposes of removal of doubt,  after * Agouron and JT * listed on Schedule 2
for the * . 

     (b)  Notwithstanding  the  provisions  of  Paragraph  7.03(a) to the
extent  Roche,  in  addition  to the  amounts of Product  to be  provided  Roche
pursuant to the provisions of Schedule 2, wishes to purchase from Agouron and JT
all or a part of its additional requirements of Product after the Effective Date
of this  Amendment,  Agouron  and JT agree to use their  reasonable  efforts  to
supply  such  additional  Product  to Roche at the price  set  forth in  Section
4.04(b) of the  Agreement;  further,  Agouron  and JT agree that after * , Roche
upon * prior  notice  before  the  start of the month in which  Roche  wishes to
receive a  delivery  of  additional  Product  can notify  Agouron  and JT of its
election  to * to Roche in such month by up to * of the  amount  listed for such
month on Schedule 2. The parties  shall confer on a regular  basis about * . 

     (c) The provisions of Paragraph  7.03(b) shall not obligate  Agouron and/or
JT to allocate their available  supply of Product between the parties after * in
order to supply  additional  Product to Roche; only if there is available supply
of Product  after  Agouron and JT have  satisfied  the needs in their  marketing
territories,  will  Agouron  and JT's have to use their  reasonable  efforts  to
supply additional Product to Roche. 

     (d) Prior to * , Agouron  and JT agree to use their  reasonable  efforts to
provide  Roche with  finished  dosage  form(s) of  Product  in  accordance  with
Schedule 2. The amounts listed on Schedule 2 plus any amount of Product  ordered
pursuant  to the  provisions  of  Paragraph  7.03(b)  shall be deemed to be firm
orders of Product  ordered from Agouron  and/or JT; to the extent Agouron and/or
JT are able to manufacture or have  manufactured the amount of Product specified
in Schedule 2 plus any amount of Product  ordered  pursuant to the provisions of
Paragraph  7.03(b),  Roche hereby  guarantees that it will purchase such Product
from Agouron and/or JT. 

     (e) If  available  supply of Product for Roche * stated in Schedule 2 prior
to * , Agouron and JT shall * to Agouron, JT and Roche during an applicable * on
a * , based upon the * of such Product in Agouron and JT  territories * , to the
extent  such data is  available)  and the  stated  amount of Roche  requirements
contained in Schedule 2 (* pursuant to the  provisions  of  Paragraph  7.03(b));
provided,  however,  that the  available  supply of Product * purposes  during a
month shall take into  account the amounts of * 

<PAGE>

     Roche  during such month and the amount of * Roche  during such month shall
be considered  as supplied by  Agouron/JT  to Roche.  

     (f) The parties agree that Schedule 2 was calculated and agreed upon by the
parties based Roche * for the  applicable  monthly  periods and that after the *
that the * provisions of Section  5.01(b)(ix)  of the  Agreement,  including the
plus or minus * of forecasted amount,  shall * since Schedule 2 contains an * of
Product  which Roche has requested  Agouron  and/or JT provided to Roche for the
applicable * . 

     7.04 Roche shall pay to Agouron  and/or JT the amount due for its  purchase
of Compound  and/or  Product  within * of the shipping of such  Compound  and/or
Product;  any payment for the  purchase of Compound  and/or  Product that is not
paid on or before  its due date  pursuant  to the terms of this  Paragraph  7.04
shall bear interest at the lower of: (i) the average * as reported by Datastream
from time to time, * ; or (ii) the highest interest rate permitted by applicable
law,  calculated  on the  number  of days in each  month  that such  payment  is
delinquent.  If after * of Compound and/or Product  acquired from Agouron and/or
JT within * of their respective  shipping dates, then Roche shall be required to
* shall be in a form and upon  terms  acceptable  to the party  from  which such
Compound and/or Product is ordered, including that the requirement that the * be
in an amount adequate to pay for Compound and/or Product ordered; thereafter, if
a shipment of Compound  and/or  Product to Roche is not paid for within * of its
shipping date,  such * may be drawn down and * Compound  and/or Product to Roche
upon presentation of * .

     7.05 If Agouron  and/or JT in the future wish to purchase from Roche all or
a part of their  requirements  of  Compound  and/or  Product,  Roche  agrees  to
negotiate  in good  faith a  commercially  reasonable  arrangement  under  which
Agouron  and/or JT may  purchase  such  Compound  and/or  Product  from Roche at
Roche's  FBMC  plus  a  "commercially  reasonable  markup";  such  "commercially
reasonable  markup"  shall not exceed the  aggregate of (i) * of Roche's  actual
third party external costs of manufacturing Compound and/ or formulating Product
(i.e. Roche's costs for * acquired from third parties plus Roche's third party *
costs) and (ii)* of Roche's  internal  costs of  manufacturing  Compound and/ or
formulating Product (i.e. Roche's * ).



<PAGE>


 8.     SCHEDULE 2 OF AGREEMENT

     8.01 Roche  acknowledges  that its * of Compound and Product to be * in the
Licensed  Territory during and after the phase-in period described in Schedule 2
will  render  inapplicable  the  provisions  of the first  sentence  of  Section
5.01(b)(ix)  of the  Agreement  which  provides  for an * of  Schedule  2 of the
Agreement in certain  circumstances  and that  accordingly no * of Schedule 2 of
the  Agreement  shall  be  made.  Notwithstanding  the  preceding:  (i)  royalty
obligations due Agouron and JT pursuant to the provisions of Section  5.01(b)(i)
of the Agreement * during the period * , because of the  application of Schedule
2 of the Agreement shall not exceed the amount of royalties  otherwise due under
Schedule 1 of the  Agreement  by more than* ; and (ii) royalty  obligations  due
Agouron and JT pursuant to the provisions of Section 5.01(b)(i) of the Agreement
on * during  the  period *  because  of the  application  of  Schedule  2 of the
Agreement shall not exceed the amount of royalties  otherwise due under Schedule
1 of the Agreement by more than* .

9.      TRADEMARK/LABELING

         9.01 The  labeling  for any  Product to be sold and/or  distributed  by
Roche,  unless prohibited by law or regulation,  shall state that the Product is
licensed  from Agouron and JT, and indicate that the Product is a product of the
joint development of Agouron, JT and Roche.  Additionally,  unless prohibited by
law  orregulation,  such labeling shall clearly indicate that the Product is not
to be resold in the United  States,  Canada,  Japan  (other  than those areas in
Japan licensed to Roche), North Korea and South Korea.

10.     REMAINING AGREEMENT TERMS

                  10.01  Except as expressly  amended by the terms  contained in
this Amendment,  the provisions of the Agreement,  as previously amended,  shall
remain in full force and effect.




<PAGE>


         IN WITNESS  WHEREOF,  the  parties  have caused  their duly  authorized
representatives  to enter into this  Amendment to the  VIRACEPT(TM)  (Nelfinavir
Mesylate) License Agreement, effective as of the Effective Date.


AGOURON PHARMACEUTICALS, INC.                JAPAN TOBACCO INC.

By:      s/s Gary Friedman                   By:     /s/ Masakazu Kakei
Name:    Gary Friedman                       Name:   Masakazu Kakei
Title:   Corp. Vice President                Title:  Executive Director

By:      /s/ R. Kent Snyer                    By:     /s/ Tatsuya Yoneyama
Name:    R. Kent Snyder                       Name:   Tatsuya Yoneyama
Title:   Sr. Vice President                   Title:  Vice President, Business
                                                      Devel., Pharmaceuticals
                                                      Division
F. HOFFMANN-LA ROCHE LTD

By:    /s/ St. Arnold
Name:  St. Arnold
Title: Vice Director

By:    /s/ B. Scholl
Name:  B. Scholl
Title: Vice Director



<PAGE>


                                                     


                                   SCHEDULE 1



                                       *

*.

*


<PAGE>




                                   SCHEDULE 2

                                        *


<PAGE>


                                   SCHEDULE 2

                                        *


<PAGE>


                                   SCHEDULE 2

                                        *


<PAGE>


                                   SCHEDULE 2

                                        *


<PAGE>


                                   SCHEDULE 2

                                        *



<PAGE>


                                  ATTACHMENT 1

1.       *

2.       *

3.       *

4.       *

5.       *

6.       *

7.       *


*



                                                       .





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