THERAPEUTIC DISCOVERY CORP
10-K405, 1997-03-31
PHARMACEUTICAL PREPARATIONS
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                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

                                   FORM 10-K

/X/  ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES 
     EXCHANGE ACT OF 1934 FOR THE FISCAL YEAR ENDED DECEMBER 31, 1996

                        Commission file number 0-21478

                       THERAPEUTIC DISCOVERY CORPORATION 
- ------------------------------------------------------------------------------
            (Exact name of registrant as specified in its charter)

             Delaware                           94-3173191     
- -----------------------------------     ----------------------------
  (State or other jurisdiction            (I.R.S. Employer
of incorporation or organization)        Identification No.)

1454 Page Mill Rd. Suite 220, P.O. Box 10051, Palo Alto, CA    94303-0860
- ------------------------------------------------------------  --------------
  (Address of principal executive offices)                      (Zip Code)

Registrant's telephone number, including area code:  (415) 496-8200

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

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

Title of Class
- --------------
Class A Common Stock

   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. [X] 

   State the aggregate market value of the voting stock held by 
non-affiliates of the registrant, as of March 14, 1997:  $80,374,704

   Indicate the number of shares outstanding of each of the registrant's 
classes of Common Stock, as of March 14, 1997:

Title of Class                                  Number of Shares
- --------------                                  ----------------
Class A Common Stock                               7,734,424
Class B Common Stock                                     100

                  DOCUMENTS INCORPORATED BY REFERENCE

Items 10, 11, 12 and 13 of Part III are incorporated by reference to the 
definitive proxy statement for the registrant's Annual Meeting of 
Stockholders to be held on May 8, 1997.


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       THERAPEUTIC DISCOVERY CORPORATION FORM 10-K ANNUAL REPORT
               FOR THE FISCAL YEAR ENDED DECEMBER 31, 1996

                            TABLE OF CONTENTS

PART I

ITEM 1. BUSINESS.........................................................    3

ITEM 2. PROPERTIES.......................................................   13

ITEM 3. LEGAL PROCEEDINGS................................................   13

ITEM 4. SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS..............   13

PART II

ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER
        MATTERS..........................................................   15

ITEM 6. SELECTED FINANCIAL DATA (IN THOUSANDS, EXCEPT PER SHARE DATA)....   16

ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
        RESULTS OF OPERATIONS............................................   16

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA......................   19

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
        FINANCIAL DISCLOSURE.............................................   19

PART III

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT..............   20

ITEM 11. EXECUTIVE COMPENSATION..........................................   20

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT..   20

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS..................   20

PART IV

ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS 
         ON FORM 8-K.....................................................   21


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                                   PART I

   NOTICE CONCERNING FORWARD-LOOKING STATEMENTS:  Some of the statements made 
in this Annual Report on Form 10-K are forward-looking in nature, including 
but not limited to statements that are not historical facts and statements 
including forms of the words "intend", "believe", "will", "may", "could", 
"expect", "anticipate", "possible" and similar terms.  The occurrence of the 
events described, and the achievement of the intended results, are subject to 
the future occurrence of many events which are unpredictable or outside 
Therapeutic Discovery Corporation's control and various risk factors that 
could cause Therapeutic Discovery Corporation's actual results to be 
materially different from those anticipated in any forward-looking 
statements.  Many of the significant risks are described in this Annual 
Report on Form 10-K and include, without limitation, risks associated with 
technology and product development, risks relating to clinical development, 
changes in the health care marketplace, regulatory risks, risks related to 
patent and intellectual property matters, market acceptance of products 
(including third-party reimbursement) and competition and the risk of a lack 
of funds to complete development of products.

ITEM 1.  BUSINESS

INTRODUCTION

   Therapeutic Discovery Corporation ("TDC"), a Delaware corporation with its 
mailing address at 1454 Page Mill Road, Suite 220, P.O. Box 10051, Palo Alto, 
California, 94303-0860, was formed on November 12, 1992 by ALZA Corporation 
("ALZA") for the purpose of selecting and developing new human pharmaceutical 
products combining the proprietary drug delivery technologies of ALZA with 
various drug compounds (the "TDC Products"), and commercializing such TDC 
Products, most likely through licensing to ALZA.  At the end of 1996, TDC had 
a number of products at various stages of development at ALZA, including 
several in clinical evaluation.  The products under development incorporate 
several of ALZA's drug delivery technologies.

   On June 11, 1993, ALZA distributed a special dividend of units (each, a 
"Unit") to ALZA stockholders (the "Distribution"), each Unit consisting of 
one share of TDC Class A Common Stock and one warrant to purchase one-eighth 
of one share of ALZA Common Stock at an exercise price of $65 per share.  
Holders of record of ALZA Common Stock on May 28, 1993 received one Unit for 
every 10 shares of ALZA Common Stock held, with cash distributed in lieu of 
fractional Units.  A total of 7,734,424 Units were distributed to ALZA 
stockholders.  In connection with the Distribution, ALZA made a $250 million 
cash contribution to TDC's capital, which is being used primarily to fund the 
development of TDC Products.  For a discussion of the contractual 
arrangements between TDC and ALZA, see "Arrangements with ALZA" below.

   In accordance with TDC's Restated Certificate of Incorporation, on June 
11, 1996, the units separated into their component securities--TDC Class A 
Common Stock and ALZA 


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warrants.  As a result of the separation, both securities are listed and trade 
independently on the Nasdaq Stock Market.  The trading symbol for the TDC Class 
A Common Stock is "TDCA". 

1996 PRODUCT DEVELOPMENT ACTIVITIES

   From inception through the end of 1996, TDC has invested more than $205 
million in product development.  During 1996, TDC focused its efforts on the 
products in its pipeline with the highest commercial potential, while 
reducing development activities on other products due to changes in the 
marketplace and the results of initial studies.  As is true throughout the 
pharmaceutical industry, products in development must overcome a number of 
technological, clinical, regulatory, proprietary and commercial hurdles in 
order to become successful products.  Development of some TDC Products has 
been terminated and there can be no assurance that any or all of the products 
in development by TDC, including any of those listed below, will reach the 
marketplace or will become commercially successful products.  In addition, if 
expenditures on TDC Products continue at approximately current levels, funds 
for product development will be exhausted in the second half of 1997 and at 
that time TDC will not have funds to continue or complete development of such 
products.  

   At the end of 1996, a New Drug Application for TDC's 
second-generation transdermal testosterone product to follow ALZA's 
existing Testoderm-Registered Trademark- product was submitted to the 
United States Food and Drug Administration (the "FDA").  This product, 
designed to provide physiologic testosterone replacement therapy, is a 
single patch that can be worn on the arm or torso.  In January of 1997, 
ALZA exercised its option to license this product from TDC for 12 
European countries, and ALZA entered into an agreement with Ferring N.V. 
to market the product in such countries.  As a result of the granting of 
the license, TDC received a portion of Ferring's upfront payment to ALZA 
and will receive payments from ALZA based on sales of the product in the 
12 European countries covered by ALZA's agreement with Ferring.  See 
"Arrangements with ALZA: Product License Option" below.

   Significant progress was also made in 1996 in the development of the 
DUROS-TM- leuprolide human implant product and, in early 1997, an 
Investigational New Drug application was filed for this product with the FDA 
in anticipation of commencing clinical trials.  The DUROS-TM- leuprolide 
product, which is designed to administer leuprolide continuously for an 
extended period, is in development for the treatment of prostate cancer.

   TDC's OROS-Registered Trademark- oxybutynin product is currently in Phase 
III clinical studies. The product, a once-daily dosage form, is intended for 
the treatment of urge urinary incontinence and is designed to provide an 
equivalent or decreased level of incontinent episodes with reduced side 
effects compared to current therapies.

   In the area of endocrinology, TDC has in Phase III clinical trials an 
intrauterine system for the delivery of progesterone as an adjunctive therapy 
to estrogen hormone 


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<PAGE>

replacement therapy in women.  The product is designed to provide local 
delivery of progesterone directly to the uterus for 18 up to 24 months, and 
is intended to provide protection from endometrial hyperplasia while having 
reduced side effects compared to oral progesterone replacement therapy.  

   In the area of pain management, at the end of 1996 TDC had a once-daily 
OROS-Registered Trademark- hydromorphone product in Phase III development. In 
February of 1997, ALZA exercised its option to license this product from TDC 
for the entire world, and ALZA entered into an agreement with Knoll 
Pharmaceutical Company and its parent company Knoll AG (collectively, 
"Knoll") for the further clinical development and worldwide commercialization 
of this product.  Under the terms of its license to ALZA, TDC will receive a 
portion of the amounts ALZA receives from Knoll based on worldwide sales of 
the product and a portion of certain milestone payments made by Knoll to 
ALZA.  See "Arrangements with ALZA:  Product License Option" below.

   In 1996, TDC continued preclinical development on the OROS-Registered 
Trademark- methylphenidate product, designed to provide once-daily dosing of 
methylphenidate with a uniquely efficacious pattern of delivery for the 
treatment of attention deficit disorder.  Clinical studies are expected to 
begin with this product in the second half of 1997.

   In choosing appropriate product candidates for development, TDC and ALZA 
have used a market-driven approach under which they have examined unmet 
medical needs in selected therapeutic areas and then targeted cost-effective 
products for development.  The therapeutic areas in which TDC Products are 
focused are pain management, urology, supportive therapies in oncology and 
AIDS and endocrinology; however, ALZA and TDC have also pursued product 
opportunities outside these therapeutic areas where ALZA's drug delivery 
systems can add significant value to drug therapy.  As TDC's cash available 
for product development has decreased, TDC has focused less attention on 
choosing additional product candidates, and correspondingly more attention on 
its products already under development.  By the end of 1996, TDC product 
discovery activities were essentially complete.

ARRANGEMENTS WITH ALZA

   TECHNOLOGY LICENSE AGREEMENT.  TDC and ALZA are parties to a technology 
license agreement pursuant to which ALZA granted to TDC, subject to certain 
pre-existing rights, an exclusive, worldwide, royalty-free license, in 
perpetuity, to use ALZA's drug delivery technology and patents (the "ALZA 
Technology") solely for the development and commercialization of TDC 
Products.  ALZA retains the right to use ALZA Technology in any other manner 
and for all other purposes.

   PRODUCT DEVELOPMENT.  TDC and ALZA are parties to a development agreement 
(the "Development Contract") pursuant to which ALZA conducts research and 
development activities on behalf of TDC in connection with the development of 
TDC Products.  Payments to ALZA under the Development Contract consist of the 
fully-


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<PAGE>

burdened costs (the "Development Costs") of all activities undertaken by ALZA 
in connection with the development of TDC Products under work plans approved 
by TDC. TDC is required to utilize all funds contributed to TDC by ALZA, plus 
any investment income earned thereon, less organization costs and 
administrative expenses (including reasonable reserves for TDC operations) 
and the costs of the Distribution (the "Available Funds") on the development 
of TDC Products. Most of TDC's Available Funds have been and will continue to 
be used to reimburse ALZA for activities undertaken with respect to the 
development of TDC Products.  Based on TDC's current rate of expenditures on 
TDC Products, it can be expected that TDC's Available Funds will be exhausted 
in the second half of 1997 and product development funding by TDC will cease. 
See Part II, Item 7, "Management's Discussion and Analysis of Financial 
Condition and Results of Operations."

   TDC owns all TDC Products.  ALZA owns all technology developed or 
otherwise obtained pursuant to the Development Contract ("Developed 
Technology"), subject to TDC's right to use Developed Technology solely in 
connection with the development and commercialization of TDC Products.  Costs 
incurred to obtain and maintain patents covering Developed Technology are 
shared equally by TDC and ALZA during the term of the Development Contract.  
ALZA owns all patents covering Developed Technology; TDC has an exclusive 
license to such patents solely for use in connection with the development and 
commercialization of TDC Products.  

   ALZA will pay royalties (the "Technology Royalties") to TDC, on a 
country-by-country basis, in respect of sales in the relevant country of any 
product, other than a TDC Product, that is covered at the time of sale by one 
or more patents issued in such country which are based on Developed 
Technology (each, an "Other Royalty-Bearing Product").  The Technology 
Royalties will be the sum of (i) 1% of ALZA's net sales of such Other 
Royalty-Bearing Product in such country, plus (ii) 10% of any percentage of 
sales or other payment received by ALZA with respect to third party sales of 
such Other Royalty-Bearing Product in such country.  In determining the 
Technology Royalties due to TDC for any Other Royalty-Bearing Product, net 
sales and other payments will be reduced by the dollar amount of any license 
or similar payments due to third parties from ALZA with respect to such Other 
Royalty-Bearing Product.  If the Other Royalty-Bearing Product is an 
electrotransport product, this reduction will include payments due from ALZA 
to Medtronic, Inc. ("Medtronic") under an existing agreement between ALZA and 
Medtronic covering electrotransport products.  

   ALZA has the option to buy out the right of TDC to receive Technology 
Royalties with respect to any Other Royalty-Bearing Product on either a 
country-by-country or worldwide basis at a buy-out price determined according 
to formulae specified in the Development Contract.

   PRODUCT LICENSE OPTION.  TDC has granted to ALZA an option to acquire, on 
a product-by-product and country-by-country basis, a perpetual, exclusive, 
royalty-bearing license to make, have made, use and sell any or all TDC 
Products (the "License Option").


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If ALZA exercises its License Option for any TDC Product (a "Licensed TDC 
Product"), ALZA will pay the following royalties ("Product Royalties") to TDC:

   (a)   if the Licensed TDC Product is sold by ALZA, Product Royalties of up 
to a maximum of 5% of ALZA's net sales of the Licensed TDC Product determined 
as follows: (i) 1% of net sales, other than sales to distributors or 
sublicensees who agree to pay royalties or make percentage of sales payments 
to ALZA or any affiliate of ALZA and in respect of which the Product 
Royalties are determined as provided in clause (b) below, plus (ii) an 
additional 0.1% of such net sales for each full $1 million of the Development 
Costs of the Licensed TDC Product paid by TDC; and

   (b)   if the Licensed TDC Product is sold by a third party, Product 
Royalties of up to a maximum of 50% of third party payments to ALZA with 
respect to such Licensed TDC Product determined as follows: (i) 10% of such 
third party payments, plus (ii) an additional 1% of such third party payments 
for each full $1 million of the Development Costs of the Licensed TDC Product 
paid by TDC.

In each case, net sales and other third party payments will be reduced by the 
dollar amount of any license or similar payments due to third parties from 
ALZA with respect to the Licensed TDC Product.  If the Licensed TDC Product 
is an electrotransport product, this reduction will include the amount of any 
payments due from ALZA to Medtronic.  It is possible that, in order to 
develop a TDC Product, licenses or other arrangements with third parties may 
be necessary or appropriate.  Such arrangements could require payments by 
ALZA which would reduce net sales and other payments in determining payments 
owed to TDC.

   ALZA may exercise the License Option with respect to any TDC Product, on a 
country-by-country basis, at any time until 90 days after the earliest of the 
following:  (a) approval to market the TDC Product in such country by the 
appropriate regulatory agency; (b) approval to market the TDC Product in the 
United States by the FDA; or (c) the expiration of the Purchase Option (as 
defined below).

   ALZA has the option to buy out TDC's right to receive Product Royalties 
with respect to any Licensed TDC Product on either a country-by-country or 
worldwide basis. The country-by-country buy-out option may be exercised in 
respect of any Licensed TDC Product in any country at any time after the 
twelfth complete calendar quarter following the first commercial sale of the 
Licensed TDC Product in such country. The worldwide buy-out option may be 
exercised in respect of any Licensed TDC Product at any time after the 
twelfth complete calendar quarter following the first commercial sale of the 
Licensed TDC Product in either (x) the United States or (y) two of the 
following countries:  the United Kingdom, France, Germany, Italy or Japan.  
The buy-out price in the case of a country specific buy-out will be 15 times 
the Product Royalties paid by or due from ALZA to TDC in respect of such 
Licensed TDC Product in such country.  The buy-out price in the case of a 
worldwide buy-out will be 20 times the worldwide Product Royalties paid by or 
due from ALZA to TDC in respect of sales of the Licensed TDC Product (and, in 
addition, such 


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Product Royalties as would have been paid or due from ALZA to TDC if ALZA had 
not exercised any country specific buy-out option with respect to such 
Licensed TDC Product), less any amounts previously paid to exercise any 
country specific buy-out option with respect to such Licensed TDC Product.  
In either case, the buy-out price will be determined with reference to the 
most recent four calendar quarters, preceding the date of exercise of the 
buy-out option, for which Product Royalties were paid.

   As described above under "1996 Product Development Activities," since the 
beginning of 1997 ALZA has exercised its License Option with respect to TDC's 
transdermal testosterone product for 12 European countries and with respect 
to TDC's OROS-Registered Trademark- hydromorphone product on a worldwide 
basis.  Product Royalties payable to TDC with respect to the OROS-Registered 
Trademark- hydromorphone product differ from the standard royalty payment 
because TDC and ALZA agreed that, in exchange for TDC foregoing its share of 
an upfront payment and the first milestone payment to be received by ALZA 
from Knoll, ALZA will pay TDC an additional 1% of net sales and an additional 
10% of third party payments plus the standard Product Royalties described 
above.

   PURCHASE OPTION.  ALZA has certain rights pursuant to the Restated 
Certificate of Incorporation of TDC to purchase all (but not less than all) 
of the TDC Class A Common Stock (the "Purchase Option").  The Purchase Option 
may be exercised by written notice to TDC at any time during the period 
ending on December 31, 1999; provided that such date will be extended for 
successive one year periods if, as of any June 30 beginning with June 30, 
1999, TDC has not used at least 90% of all Available Funds pursuant to the 
Development Contract.  The Purchase Option will in any case terminate on the 
60th day after the later of the filing or the due date of a Form 10-K or Form 
10-Q of TDC containing a balance sheet showing less than $5 million of cash, 
cash equivalents and short-term and long-term investments.  Based on TDC's 
current rate of expenditures on TDC Products, it can be expected that TDC's 
balance sheet will reach this threshold in the second half of 1997.  See  
Part II, Item 7, "Management's Discussion and Analysis of Financial Condition 
and Results of Operations."

   If the Purchase Option is exercised, the exercise price (the "Purchase 
Option Exercise Price") will be the greatest of the following:

   (a)   $100 million;

   (b)   the greater of (i) 25 times the worldwide Product Royalties and 
Technology Royalties paid by or due from ALZA to TDC with respect to all 
Licensed TDC Products and Other Royalty-Bearing Products (and, in addition, 
such Product Royalties and Technology Royalties as would have been paid by or 
due from ALZA to TDC if ALZA had not exercised its buy-out option with 
respect to any Licensed TDC Product or Other Royalty-Bearing Product) during 
the most recent four calendar quarters preceding the exercise of the Purchase 
Option for which such royalties were paid or due, or (ii) 100 times such 
Product Royalties or Technology Royalties paid by or due from ALZA to TDC 
during the most recent such calendar quarter, but in either case less any 
amounts previously paid to 


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exercise any buy-out option with respect to a Licensed TDC Product or an 
Other Royalty-Bearing Product;

   (c)   the fair market value of one million shares of ALZA Common Stock; or

   (d)   $325 million less all amounts spent by TDC under the Development 
Contract.

Based on information available at the end of 1996, the Purchase Option 
Exercise Price is expected to be $100 million.

   For purposes of calculating the Purchase Option Exercise Price, any 
special upfront third party payments will be amortized equally over a period 
of 28 calendar quarters beginning with the calendar quarter in which such 
payment is made.  In each case, the amount payable will be reduced to the 
extent, if any, that TDC's liabilities at the time of exercise of the 
Purchase Option (other than liabilities under the Development Contract) 
exceed TDC's cash and cash equivalents, and short-term and long-term 
investments (excluding from such cash and cash equivalents, and short-term 
and long-term investments the amount of Available Funds remaining at such 
time).

   At the time of exercise of the Purchase Option ALZA may decide, in its 
discretion, to pay the Purchase Option Exercise Price in cash, in ALZA Common 
Stock, or in any combination of cash and ALZA Common Stock.

   ALZA has not made a decision as to whether it will exercise the Purchase 
Option.  ALZA is under no obligation to exercise the Purchase Option and will 
do so only if ALZA determines that it is in the best interests of ALZA and 
its stockholders at the time the decision is made.

   Until the expiration of the Purchase Option, ALZA, as the sole holder of 
TDC's Class B Common Stock, is entitled to vote separately as a class with 
respect to, and therefore could prevent, any merger or liquidation of TDC, 
the sale, lease, exchange, transfer or other disposition of any substantial 
asset of TDC, and any amendments to the Restated Certificate of Incorporation 
of TDC that would alter the Purchase Option, TDC's capitalization, or the 
provisions of the Restated Certificate of Incorporation concerning TDC's 
board of directors. 

   SERVICES AGREEMENT.  TDC and ALZA have a services agreement (the "Services 
Agreement") pursuant to which ALZA provides TDC with administrative services 
on a fully-burdened cost reimbursement basis.  TDC may terminate the Services 
Agreement at any time upon 60 days' written notice.


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PRODUCT DEVELOPMENT RISKS

   All pharmaceutical products require extensive development and clinical 
activities before an application can be filed for regulatory approval to 
market the product.  There are many risks inherent in this process and it 
should be expected that some of the products for which development is 
initiated ultimately will not become commercial products.  Substantial 
technical, financial and human resources are required to successfully 
complete the development of a product. The proper performance characteristics 
for the product must be defined, and the product must be designed and 
developed to meet those characteristics.  Every product faces significant 
technological hurdles, and often one or more of these cannot be achieved.  

   After the product is manufactured on a pilot scale, clinical safety and 
efficacy must be shown.  Clinical studies are very costly, and can take many 
years to complete. There can be no assurance that the desired outcomes will 
be shown in the clinical studies or that regulatory approval for the product 
will be obtained.  Several years, and millions of dollars, may be spent 
before it can be known whether all technical and clinical requirements for a 
product can be met.  There are further technology risks in converting a pilot 
scale manufacturing process to a commercial scale manufacturing process.  
Finally, even once a product is developed, approved by regulatory authorities 
and manufactured, there can be no assurance of its commercial success.  In 
order to provide added value and gain medical and commercial acceptance, a 
product must show some performance improvements over products incorporating 
the same or similar drug compounds.  In some cases, these benefits may be 
difficult to establish.

   As discussed above, if expenditures on TDC Products continue at 
approximately current levels, funds for product development will be exhausted 
in the second half of 1997 and at that time TDC will not have funds to 
complete development of such products.

GOVERNMENTAL REGULATION

   Under the United States Food, Drug, and Cosmetic Act, "new drugs" must 
obtain clearance from the FDA before they lawfully can be marketed in the 
United States.  Applications for marketing clearance must be based on 
extensive clinical and other testing, the cost of which is very substantial.  
The packaging and labeling of all new drug products are also subject to FDA 
regulation.  Approvals (sometimes including pricing approvals) are required 
from health regulatory authorities in foreign countries before marketing of 
pharmaceutical products may commence in those countries.  Requirements for 
approval may differ from country to country, and can involve additional 
testing.  There can be substantial delays in obtaining required clearances 
from both the FDA and foreign regulatory authorities after applications are 
filed.  Even after clearances are obtained, further delays may be encountered 
before the products become commercially available.

   All facilities and manufacturing techniques used for the manufacture of 
products for clinical use or for sale must conform with "Good Manufacturing 
Practices", the FDA 



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<PAGE>

regulations governing the production of pharmaceutical products, and 
comparable regulations of health regulatory authorities in foreign countries. 
From time to time, the FDA and other federal, state and local government 
agencies (including, without limitation, those agencies mandated to oversee 
environmental laws and regulations) may adopt regulations that affect the 
manufacturing and marketing of TDC Products.

PATENTS AND PATENT APPLICATIONS

   Under the Development Contract, ALZA determines whether and to what extent 
to seek patent protection for TDC Products and Developed Technology.  If ALZA 
declines to seek patent protection for any TDC Product or any Developed 
Technology, TDC does not have the right to do so.

   Patent protection generally has been important in the pharmaceutical 
industry and the commercial success of TDC Products may depend, in part, upon 
ALZA's election to seek patent protection and its ability to obtain such 
patents both in the United States and abroad.  Although ALZA's patents, 
pending patent applications, and any patents obtained on future applications 
covering any ALZA Technology, Developed Technology or TDC Product, may be 
important to future operations, there can be no assurance that any additional 
patents will be issued or that any patents, now or hereafter issued, will be 
of commercial benefit.  In the United States, patents are generally granted 
for specified periods of time.  Some of ALZA's earlier patents covering 
various aspects of ALZA Technology licensed to TDC have begun to expire, or 
will expire, over the next several years; however, ALZA Technology is 
generally covered by multiple patents.

   Although a patent has a statutory presumption of validity in the United 
States, the issuance of a patent is not conclusive as to such validity or as 
to the enforceable scope of the claims of the patent.  There can be no 
assurance that ALZA patents covering any ALZA Technology, Developed 
Technology or TDC Product will not be successfully challenged in the future.  
In some cases, third parties have initiated reexamination by the Patent and 
Trademark Office of patents issued to ALZA.  The validity or enforceability 
of ALZA patents after their issuance have also been challenged in litigation. 
If the outcome of such litigation is adverse to ALZA, third parties may then 
be able to use the invention covered by the patent, in some cases without 
payment.  There can be no assurance that ALZA patents will not be infringed 
or successfully avoided through design innovation.

   It is also possible that third parties may obtain patent or other 
proprietary rights that may be necessary or useful to TDC.  With numerous 
other companies engaged in developing drug delivery technologies, it can be 
expected that other parties may in some circumstances file patent 
applications or obtain patents that compete in priority with ALZA's patent 
applications.  Such competition may result in adversarial proceedings such as 
patent interferences and oppositions, which can increase the uncertainty of 
patent coverage.  In cases where third parties are first to invent a 
particular product or technology, it is possible that those parties will 
obtain patents that will be sufficiently broad so as to prevent TDC from 
using certain technology or from further developing or 


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<PAGE>

commercializing certain products.  If licenses from third parties are 
necessary but cannot be obtained, commercialization of the TDC Product would 
be delayed or prevented.

   In addition, TDC utilizes significant unpatented proprietary ALZA 
Technology, and there can be no assurance that others will not develop 
similar technology.

COMPETITION

   All TDC Products and Other Royalty-Bearing Products, if any, will face 
competition both from more traditional forms of drug delivery and from 
advanced delivery systems being developed by others.  In some instances, 
because TDC is developing products which incorporate drugs that are 
off-patent or being developed by multiple companies, TDC will face 
competition from products based on the same drug components.  This 
competition potentially includes all of the pharmaceutical companies in the 
world.  Many of these other pharmaceutical companies have greater financial 
resources, technical staffs and manufacturing and marketing capabilities than 
ALZA or TDC.  A number of smaller companies also are developing drug delivery 
technologies. 

   Competition in drug delivery systems is generally based on performance 
characteristics and price.  Acceptance by hospitals, physicians and patients 
is crucial to the success of a product.  Health care reimbursement policies 
of managed care organizations, insurers and government agencies will continue 
to exert pressure on pricing, and various federal and state agencies have 
enacted regulations requiring rebates of a portion of the purchase price of 
many pharmaceutical products.  Cost-effectiveness, although often difficult 
to measure, is becoming increasingly critical.

   The health care industry has continued to change rapidly as the public, 
government, medical practitioners and the pharmaceutical industry focus on 
ways to expand medical coverage while controlling the growth in health care 
costs.  The growth of managed care organizations and the resulting pressures 
for cost-containment in the United States health care system are expected to 
continue to put pressures on the prices charged for pharmaceutical products.  
Prescription drug reimbursement practices and the growth of large managed 
care organizations, as well as generic and therapeutic substitution 
(substitution of a different product for the same indication), could 
significantly affect TDC's business.  While TDC believes the changing health 
care environment may increase the value of TDC Products over the long term, 
it is impossible to predict the impact these changes may have on TDC.

REVENUES AND NET LOSS

   Revenues, consisting of net interest and investment income earned on 
invested funds and license fees, were approximately $8.2 million in 1996, 
$11.5 million in 1995, and $8.7 million in 1994.  Revenues were approximately 
$34.3 million for the period from inception (November 1992) to December 31, 
1996.  As TDC's funds have continued to be utilized under the Development 
Contract, lower cash balances are available for 


                                     12
<PAGE>

investment, and net interest income therefore continues to decrease.  Based 
on TDC's current rate of expenditures on TDC Products, it can be expected 
that TDC's funds will be exhausted in the second half of 1997.

   TDC reported a net loss of approximately $94.8 million or $12.25 per 
common share for 1996, $59.4 million or $7.68 per common share for 1995, and 
$25.7 million or $3.32 per common share for 1994.  TDC had a net loss of 
approximately $180.2 million for the period from inception (November 1992) to 
December 31, 1996.  The increasing net loss resulted primarily from the 
substantial increase in development activities each year since 1994.

RESEARCH AND DEVELOPMENT EXPENSES

   TDC incurred research and development expenses of approximately $100.0 
million during 1996, $68.9 million during 1995, and $31.6 million during 
1994.  Research and development expenses have totaled approximately $205.4 
million for the period from inception (November 1992) to December 31, 1996.  
The increase in research and development activities is due to an increase in 
product development activities and products reaching later stages of 
development.

EMPLOYEES

   On December 31, 1996, TDC had one employee, Dr. Gary L. Neil, its 
   President and Chief Executive Officer.

ITEM 2.  PROPERTIES

   TDC's corporate offices are located in Palo Alto, California.  TDC does 
   not own any facilities.

ITEM 3.  LEGAL PROCEEDINGS

   None.

ITEM 4.  SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

   None.




                                      13
<PAGE>

                   EXECUTIVE OFFICERS OF THE REGISTRANT

<TABLE>
<CAPTION>

                                               Principal Occupations for
        Name                  Age                     Past Five Years
- -----------------------      -----       ------------------------------------------
<S>                          <C>         <C>
Gary L. Neil, PhD               56       June 1993 to present, President and Chief    
President and Chief                      Executive Officer of TDC; April 1990 to May  
Executive Officer                        1993, Executive Vice President, Wyeth-       
                                         Ayerst Research; May 1989 to April 1990,     
                                         Senior Vice President, Wyeth-Ayerst          
                                         Research; prior to 1989, various scientific  
                                         and other management positions with the      
                                         Upjohn Company.                              

David R. Hoffmann*              52       Vice President and Treasurer of ALZA    
Vice President, Finance                  Corporation since 1994;  other positions
and Secretary                            with ALZA, including Vice President,    
                                         Finance/Vice President and Controller,  
                                         since 1976.                             


Suzanne C. Martin*              47       Vice President, Development Programs of  
Vice President,                          ALZA Corporation since October 1994;    
Research and                             other positions with ALZA Corporation,   
Development                              including Executive Director, Project    
Administration                           Management and Senior Director of        
                                         Research and Development Administration  
                                         since 1988.                              

</TABLE>

*  Mr. Hoffmann and Ms. Martin are employees of ALZA who provide services to 
TDC under its agreements with ALZA.  They do not receive compensation from 
TDC.


                                     14

<PAGE>

                                  PART II

ITEM 5.  MARKET FOR REGISTRANT'S COMMON EQUITY AND RELATED STOCKHOLDER MATTERS

   TDC Class A Common Stock was originally traded as part of Units, each Unit 
consisting of one share of TDC Class A Common Stock and one warrant to 
purchase one-eighth of one share of ALZA Common Stock at an exercise price of 
$65 per share. The Units were quoted on the Nasdaq Stock Market under the 
symbol TDCAZ until June  11, 1996.  On June 11, 1996, the Units separated 
into their component securities--TDC Class A Common Stock and ALZA warrants.  
As a result of the separation, TDC Class A Common Stock is quoted 
independently on the Nasdaq Stock Market under the symbol "TDCA".  The TDC 
Class B Common Stock is not publicly traded.  As of December 31, 1996, there 
were approximately 5,827 holders of record of TDC Class A Common Stock and 
one holder of TDC Class B Common Stock.  TDC has not paid any dividends on 
its Common Stock and does not intend to do so.  In addition, TDC's Restated 
Certificate of Incorporation prohibits the payment of dividends with 
Available Funds.  (Available Funds are defined as all funds contributed to 
TDC by ALZA, plus any investment income earned thereon, less the costs of the 
Distribution and TDC's reasonable ongoing administrative expenses, including 
reasonable reserves for TDC's operations.)

   The quarterly high and low sales prices of Units (prior to June 11, 1996) 
and TDC Class A Common Stock (after June 11, 1996) for the calendar years 
1996 and 1995 as quoted on the Nasdaq Stock Market were as follows:

                                     1996                   1995
                            --------------------     -------------------
                              High         Low         High       Low
                              ----         ---         ----       ---

First Quarter               $ 10 5/8     $ 7 1/8     $ 6 1/2     $ 5 1/4

Second Quarter              $  9 7/8     $ 8 7/8     $ 7 7/8     $ 6

Third Quarter               $ 10         $ 8         $ 7 3/4     $ 6 3/4

Fourth Quarter              $ 11 3/8     $ 9 3/8     $ 7 1/4     $ 6 3/4




                                      15

<PAGE>

ITEM 6.  SELECTED FINANCIAL DATA (IN THOUSANDS, EXCEPT PER SHARE DATA)

<TABLE>
<CAPTION>
                                                                                         Period from          Period from
                                                                                          Inception            Inception
                                        Year Ended      Year Ended        Year Ended    (November 1992)     (November 1992)
                                        December 31,    December 31,      December 31,   to December 31,     to December 31,
                                           1996            1995               1994            1993                1996
                                        ------------    ------------      ------------   --------------      ---------------
<S>                                     <C>             <C>               <C>              <C>                  <C>
Total revenues
(net interest and
investment                              $   8,215      $   11,540        $    8,673        $   5,908           $  34,336
income and license fees)

Net loss                                $ (94,750)     $  (59,403)       $  (25,661)       $    (384)          $(180,198)

Net loss per
common share                            $  (12.25)     $    (7.68)       $    (3.32)       $    (.05)        

Total assets                            $  88,460      $  181,437        $  220,427        $ 251,928

Total liabilities                       $  19,316      $   16,965        $    7,849        $   2,454
</TABLE>

No cash dividends were paid from inception (November 1992) through December 
31, 1996.

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

LIQUIDITY AND CAPITAL RESOURCES

   TDC was formed in November 1992 by ALZA and was fully capitalized and 
commenced operations in June 1993 with approximately $250 million in cash 
contribued by ALZA.  TDC had cash and cash equivalents and short-term 
investments of approximately $85.3 million at December 31, 1996, as compared 
with $176.6 million at December 31, 1995, and $213.7 million at December 31, 
1994.  During 1994, TDC realized losses of approximately $3.9 million when it 
repositioned its investment portfolio to take advantage of higher interest 
rates.

   TDC's cash expenditures for operating activities were approximately $90.4 
million in 1996, as compared with $48.3 million in 1995, and $19.4 million in 
1994.  Cash expenditures for operating activities were approximately $163.0 
million from inception (November 1992) to December 31, 1996, and differ from 
TDC's net losses of approximately $180.2 million for the same period due 
primarily to the amount payable to ALZA for research and development and 
amortization of organization expenses.  TDC's remaining cash, plus interest 
earned thereon, less administrative expenses (including reasonable reserves 
for TDC's operations) will be used primarily to fund the development of TDC 
Products under the Development Contract.  Funds not immediately required for 
development activities and administrative expenses have been invested in low 
risk securities.  TDC's investment portfolio includes investments in 
collateralized mortgage 


                                   16
<PAGE>

securities, U.S. Government securities, corporate notes, and asset backed 
notes.  As TDC's funds continue to be utilized under the Development 
Contract, increasingly lower cash balances will be available for investment.

   Based on TDC's current rate of expenditures on TDC Products, it is 
expected that funds for product development will be exhausted in the second 
half of 1997 and product development funding by TDC will cease.  However, 
several factors could impact the level and timing of TDC funding, including 
the discontinuation of the development of any TDC Products, any commercial 
arrangements between ALZA and other companies which would cause ALZA to 
exercise its License Option with respect to any TDC Product, any change in 
the number of projects advancing to or continuing in later stages of 
development or any adjustments in the rate of spending on products currently 
in development.

   When cash available for product development is exhausted, which is 
anticipated to occur in the second half of 1997, certain critical timetables 
will be triggered.  First, ALZA's Purchase Option with respect to all of 
TDC's Class A Common Stock will expire on the 60th day after the later of the 
filing or the due date of a Form 10-K or Form 10-Q of TDC containing a 
balance sheet showing less than $5 million of cash, cash equivalents and 
short-term and long-term investments.  In addition, ALZA has the right, for 
90 days after expiration of the Purchase Option, to license any or all TDC 
Products which have not yet been licensed, on a product-by-product and 
country-by-country basis.  ALZA is under no obligation to exercise the 
Purchase Option or the License Option with respect to any TDC Product and 
will do so only if ALZA determines that it is in the best interests of ALZA 
and its stockholders at the time the decision is made.  In the event that 
ALZA does not exercise the Purchase Option or the License Option for all TDC 
Products, TDC will not have funds to continue or complete development of any 
remaining products.

   ALZA has undertaken to fund certain TDC Product development 
activities which will not be completed before available cash is 
exhausted and which are described in work plans approved by TDC.  Such 
funding by ALZA would begin on a product-by-product basis when TDC no 
longer has funds available to pay for such activities. Such funding will 
continue only during the period prior to the expiration of the Purchase 
Option and the License Option when ALZA has not yet made a determination 
whether or not to exercise its Purchase Option or its License Option for 
the particular product.  However, this undertaking is subject to ALZA's 
determination of the continued technical and commercial feasibility of 
the product and the compatibility of the product with ALZA's product 
portfolio and business objectives.

   The Board of Directors of TDC has initiated activities to establish a 
contingency plan for the continued operations of TDC in the event that ALZA 
chooses not to exercise the Purchase Option.  Possible actions under the 
contingency plan, which could be implemented individually or in combination, 
include the sale or license of TDC Products for which ALZA has not exercised 
its License Option, either worldwide or for countries for which ALZA has not 
exercised its option; the sale of TDC's rights to future 


                                    17
<PAGE>

payments with respect to  TDC Products licensed by ALZA; and the sale of 
TDC's rights to future payments from ALZA with respect to the Developed 
Technology.  TDC's Board will review the contingency plan on a regular basis. 
In the event that ALZA does not exercise the Purchase Option, there can be 
no assurance that the contingency plan will result in returns to TDC 
stockholders.

   The Board has the right, under its agreements with ALZA, to take necessary 
steps to cease development funding and maintain an adequate reserve to ensure 
TDC's ability to meet its operating cash needs through at least December 31, 
1997.

RESULTS OF OPERATIONS

   Revenues, consisting of net interest and investment income earned on 
invested funds and license fees, were approximately $8.2 million for the year 
ended December 31, 1996, as compared with $11.5 million for the year ended 
December 31, 1995, and $8.7 million for the year ended December 31, 1994.  
Revenues were approximately $34.3 million for the period from inception 
(November 1992) to December 31, 1996.  As TDC's funds are utilized under the 
Development Contract, lower cash balances are available for investment and 
therefore net interest income continues to decrease.  During the period in 
which products are under development and applications for regulatory approval 
are submitted and reviewed, TDC does not anticipate significant revenues.

   TDC incurred research and development expenses of approximately 
$100.0 million during 1996, as compared with $68.9 million during 1995, 
and $31.6 million during 1994.  Research and development expenses have 
totaled approximately $205.4 million for the period from inception 
(November 1992) to December 31, 1996.  Research and development 
expenditures increased in 1996 over 1995, as expected, as activities 
increased and as products reached later stages of development.  TDC's 
research and development expenses are expected to continue at 
approximately current levels during 1997 subject, as discussed above, to 
the occurrence of various events which could affect the level and timing 
of TDC's expenditures on research and development.

   TDC incurred general and administrative expenses of approximately $3.0 
million for the year ended December 31, 1996, as compared with $2.3 million 
for the year ended December 31, 1995, and $2.7 million for the year ended 
December 31, 1994. The increase in general and administrative expenses is due 
primarily to the additional activities required to support the increase in 
research and development activities.  General and administrative expenses 
have totaled approximately $9.5 million for the period from inception 
(November 1992) to December 31, 1996.  TDC incurred approximately $152,000 
during 1996, $136,000 during 1995 and $206,000 during 1994 in administrative 
expenses under the Services Agreement with ALZA.  Administrative expenses 
were approximately $614,000 for the period from inception (November 1992) to 
December 31, 1996.

   TDC reported a net loss of approximately $94.8 million or $12.25 per 
common share in the year ended December 31, 1996, as compared with $59.4 
million or $7.68 per common share in the year ended December 31, 1995, and 
$25.7 million or $3.32 per 



                                    18
<PAGE>

common share in the year ended December 31, 1994.  TDC had a net loss of 
approximately $180.2 million for the period from inception (November 1992) to 
December 31, 1996.  The increasing net loss resulted primarily from the 
substantial increase in development activities each year since 1994.  It is 
anticipated that TDC will continue to record significant net losses as 
products enter or continue in later stages of development, if additional 
products are accepted by TDC for development, and as investment income 
decreases as funds available for investment are reduced.

   For the years ended December 31, 1996, 1995, and 1994, the provision for 
income taxes was not material.

ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

   The financial statements are filed as part of this Annual Report on Form 
10-K (see Item 14).

ITEM 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND 
         FINANCIAL DISCLOSURE

   Not applicable.



                                      19

<PAGE>

                                   PART III

ITEM 10.  DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

   TDC incorporates by reference the information concerning its directors set 
forth under the heading "Election of Directors" on pages 1 through 3 in TDC's 
definitive proxy statement dated March 27, 1997 for its Annual Meeting of 
Stockholders to be held May 8, 1997 (the "Proxy Statement").  Information 
concerning TDC's executive officers appears at the end of Part I of this 
report on page 14.

ITEM 11.  EXECUTIVE COMPENSATION

   TDC incorporates by reference the information ("Summary Compensation 
Table", "1996 Option Grants" and "1996 Aggregated Option Exercises and Fiscal 
Year-End Option Values") set forth under the heading "Executive Compensation" 
on page 4 in the Proxy Statement.

ITEM 12.  SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT

   TDC incorporates by reference the information set forth under the heading 
"Beneficial Stock Ownership" on pages 7 through 8 in the Proxy Statement.

ITEM 13.  CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

   TDC incorporates by reference the information set forth under the heading 
"Certain Transactions" on page 8 in the Proxy Statement.




                                      20

<PAGE>

                                    PART IV

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

(a) Documents filed as part of this Annual Report on Form 10-K:

    1.  Financial Statements (See Index to Financial Statements on page 23)

    2.  Financial Statement Schedules (None) 

    3.  Exhibits:

         3.1  Restated Certificate of Incorporation of Therapeutic Discovery 
              Corporation filed with the Delaware Secretary of State on 
              April 1, 1993.

         3.2  Restated By-laws of Therapeutic Discovery Corporation dated 
              January 26, 1994.

        10.1  Technology License Agreement between Therapeutic Discovery 
              Corporation and ALZA Corporation dated March 10, 1993.

        10.2  Development Agreement between Therapeutic Discovery 
              Corporation and ALZA Corporation dated March 10, 1993.

        10.3  License Option Agreement between Therapeutic Discovery 
              Corporation and ALZA Corporation dated March 10, 1993.

        10.4  Services Agreement between Therapeutic Discovery Corporation 
              and ALZA Corporation dated March 10, 1993.

        10.5  Amended and Restated 1993 Stock Option Plan.

        10.6  Executive Deferral Plan.

        10.7  Agreement Regarding Certain Products and Activities and 
              Amendment No. 1 to Development Agreement between 
              Therapeutic Discovery Corporation and ALZA Corporation.

        27    Financial Data Schedule

(b) No reports on Form 8-K were filed during the quarter ended December 31, 1996


                                     21
<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.

Date:  March 27, 1997           THERAPEUTIC DISCOVERY CORPORATION


                                By    /s/   Gary L. Neil
                                   ------------------------------
                                          Dr. Gary L. Neil
                                           President and
                                      Chief Executive Officer


   Pursuant to the requirements of the Securities Exchange Act of 1934, this 
report has been signed below by the following persons on  behalf of the 
registrant and in the capacities and on the dates indicated.

/s/  Gary L. Neil                    /s/  David R. Hoffmann     
- -----------------------------      ---------------------------------
 Dr. Gary L. Neil                    David R. Hoffmann
 President, Chief Executive          Vice President, Finance
 Officer and Director                and Principal Financial
 Date: March 27, 1997                and Accounting Officer
                                     Date: March 27, 1997


/s/  Allen M. Phipps                 /s/  William P. Sommers    
- -----------------------------      ---------------------------------
 Allen M. Phipps                     Dr. William P. Sommers
 Chairman of the Board of            Director
 Directors                           Date: March 27, 1997
 Date: March 27, 1997



/s/  Terrence F. Blaschke            /s/  Paul D. Lairson
- -----------------------------      ---------------------------------
Dr. Terrence F. Blaschke             Dr. Paul D. Lairson
Director                             Director
Date: March 27, 1997                 Date: March 27, 1997



                                 22
<PAGE>


                  Therapeutic Discovery Corporation

                    Index to Financial Statements

                             (Item 14(a))


Financial Statement                                        F Page Number
- -------------------                                        -------------

Report of Ernst & Young LLP, Independent Auditors                 1

Balance Sheet at December 31, 1996 and 1995                       2

Statement of Operations for the years ended 
December 31, 1996, 1995, and 1994 and
for the period from Inception (November 1992)
to December 31, 1996                                              3

Statement of Stockholders' Equity for the
period from Inception (November 1992) to
December 31, 1993 and for the years ended
December 31, 1994, 1995, and 1996                                4-6

Statement of Cash Flows for the years ended 
December 31, 1996, 1995, and 1994
and for the period from Inception (November 1992) 
to December 31, 1996                                              7

Notes to Financial Statements                                    8-15



   All schedules have been omitted because the required information is not 
present or is not present in amounts sufficient to require submission of the 
schedule, or because the information required is included in the financial 
statements, including the notes thereto.

   The above financial statements are included on the following pages F-1 
through F-15.


                                     23
<PAGE>

                REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS



The Board of Directors and Stockholders of
Therapeutic Discovery Corporation

   We have audited the accompanying balance sheet of Therapeutic Discovery 
Corporation (a development stage company) as of December 31, 1996 and 1995, 
and the related statements of operations, stockholders' equity and cash flows 
for the years ended December 31, 1996, 1995 and 1994 and for the period from 
inception (November 1992) to December 31, 1996.  These financial statements 
are the responsibility of the Company's management.  Our responsibility is to 
express an opinion on these financial statements based on our audits.

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

   In our opinion, the financial statements referred to above present fairly, 
in all material respects, the financial position of Therapeutic Discovery 
Corporation (a development stage company) at December 31, 1996 and 1995 and 
the results of its operations and its cash flows for the years ended December 
31, 1996, 1995 and 1994 and for the period from inception (November 1992) to 
December 31, 1996 in conformity with generally accepted accounting 
principles.  

                                                       /s/ Ernst & Young LLP

Palo Alto, California
February 14, 1997



                                   F-1
<PAGE>


                   THERAPEUTIC DISCOVERY CORPORATION
                     (A DEVELOPMENT STAGE COMPANY)

                             BALANCE SHEET 
       (IN THOUSANDS, EXCEPT NUMBER OF SHARES AND PER SHARE DATA)

<TABLE>
<CAPTION>
ASSETS                                         December 31,     December 31,
                                                    1996             1995       
                                               ------------     ------------
<S>                                            <C>              <C>
Current assets:
  Cash and cash equivalents                      $  10,597       $  13,314  
  Short-term investments                            74,707         163,294  
  Interest receivable                                  809           1,427  
  Prepaid expenses and other current assets          1,033             278      
                                               ------------     ------------
  Total current assets                              87,146         178,313  


Long-term assets: 
  Employee loans, long-term                            300             300  
  Prepaid expenses and other long-term assets            -           1,094  
  Organization costs, (net of accumulated
    amortization)                                    1,014           1,730        
                                               ------------     ------------
Total assets                                     $  88,460       $ 181,437      
                                               ------------     ------------
                                               ------------     ------------

LIABILITIES AND STOCKHOLDERS' EQUITY 

Current liabilities:   
  Payable to ALZA Corporation                    $  19,129       $  16,817  
  Accounts payable and other liabilities                72             148        
                                               ------------     ------------
    Total current liabilities                       19,201          16,965       

Long-term liabilities:
    Deferred compensation                              115               -

Stockholders' equity: 
  Class A Common Stock, $.01 par value, 
     12,000,000 shares authorized, 7,734,424 
     issued and outstanding                             77              77 
  Class B Common Stock, $.01 par value, 
    100 shares authorized, issued and 
    outstanding                                          -               - 
  Additional paid-in capital                       251,650         251,650 
  Net unrealized losses on available-for-sale
    securities                                      (1,166)           (262)
  Deficit accumulated during development stage    (180,198)        (85,448)
  Deferred compensation                             (1,219)         (1,545)
                                               ------------     ------------
    Total stockholders' equity                      69,144         164,472
                                               ------------     ------------
Total liabilities and stockholders' equity       $  88,460       $ 181,437
                                               ------------     ------------
                                               ------------     ------------
</TABLE>

                          SEE ACCOMPANYING NOTES.


                                   F-2


<PAGE>

                   THERAPEUTIC DISCOVERY CORPORATION
                     (A DEVELOPMENT STAGE COMPANY)

                        STATEMENT OF OPERATIONS
       (IN THOUSANDS, EXCEPT NUMBER OF SHARES AND PER SHARE DATA)


<TABLE>
<CAPTION>

                                                                                                  Period From
                                          Year Ended         Year Ended        Year Ended          Inception  
                                          December 31,      December 31,       December 31,    (November 1992) to
                                             1996               1995               1994        December 31, 1996
                                          ------------      ------------       ------------    -------------------
<S>                                        <C>              <C>                <C>                 <C>
REVENUES:

  Net interest and investment income       $    8,215       $    11,540        $     8,673         $   34,336  
   and license fees

EXPENSES:

  Research and development
  paid to ALZA Corporation                     99,953            68,923             31,634            205,379 
  
  General and administrative                    3,012             2,321              2,700              9,456 
                                           ----------       -----------        -----------         ----------

  Total expenses                              102,965            71,244             34,334            214,835
                                           ----------       -----------        -----------         ----------
Loss before taxes                             (94,750)          (59,704)           (25,661)          (180,499)
                                           ----------       -----------        -----------         ----------
Income tax                                          -               301                  -                301  
                                           ----------       -----------        -----------         ----------
Net loss                                   $  (94,750)      $   (59,403)       $   (25,661)        $ (180,198)
                                           ----------       -----------        -----------         ----------
                                           ----------       -----------        -----------         ----------
Net loss per common share                  $   (12.25)      $     (7.68)       $     (3.32) 
                                           ----------       -----------        -----------      
                                           ----------       -----------        -----------      
Weighted average common shares              7,734,524         7,734,524          7,734,524  
                                           ----------       -----------        -----------      
                                           ----------       -----------        -----------      
</TABLE>


                            SEE ACCOMPANYING NOTES.


                                      F-3
<PAGE>

                        THERAPEUTIC DISCOVERY CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
                        STATEMENT OF STOCKHOLDERS' EQUITY
            (IN THOUSANDS, EXCEPT NUMBER OF SHARES AND PER SHARE DATA)
<TABLE>
<CAPTION>
                                                                       Unrealized      Deficit
                                                                        losses on    Accumulated
                                      Class A    Class B   Additional   available-    During the                     Total
                            Common     Common     Common    Paid-in     for-sale     Development   Deferred     Stockholders'
                            Stock      Stock      Stock     Capital     securities      Stage     Compensation      Equity
                           --------  ---------  ---------  ----------  ------------  -----------  ------------  -------------
<S>                         <C>        <C>         <C>       <C>           <C>           <C>          <C>          <C>
Issuance of 100 shares
  of Common Stock for
  $20 per share to ALZA
  Corporation in
  November 1992             $  -       $  -        $  -      $     2       $  -         $  -         $  -         $      2 


Issuance of 7,734,424
  shares of Class A
  Common Stock for
  approximately $32.32
  per share to ALZA
  Corporation in June
  1993, net of issuance
  costs of $222                -         77           -       249,699          -             -            -         249,776 


Conversion by ALZA
  Corporation of 100
  shares of Common Stock
  into 100 shares of
  Class B Common Stock
  in June 1993                  -          -          -            -          -             -            -                - 


Deferred compensation
  resulting from grant
  of options through
  December 31, 1993             -           -         -       1,686           -             -       (1,686)               - 


Amortization of 
  deferred
  compensation                  -           -         -           -           -             -            80              80 


Net loss                        -           -         -           -           -          (384)            -            (384)
                           ------     -------   -------    --------   ---------     ---------     ---------      ----------

BALANCE,        
  DECEMBER 31,  
  1993                           -        77          -     251,387          -          (384)       (1,606)         249,474 
</TABLE>


                            SEE ACCOMPANYING NOTES.

                                      F-4
<PAGE>

                        THERAPEUTIC DISCOVERY CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
                        STATEMENT OF STOCKHOLDERS' EQUITY
            (IN THOUSANDS, EXCEPT NUMBER OF SHARES AND PER SHARE DATA)
<TABLE>
<CAPTION>
                                                                           Unrealized      Deficit
                                                                            losses on    Accumulated
                                          Class A    Class B   Additional   available-    During the                     Total
                                Common     Common     Common    Paid-in     for-sale     Development   Deferred     Stockholders'
                                Stock      Stock      Stock     Capital     securities      Stage     Compensation      Equity
                               --------  ---------  ---------  ----------  ------------  -----------  ------------  -------------
<S>                             <C>        <C>       <C>       <C>          <C>           <C>         <C>            <C>
Deferred compensation
  resulting from grant
  of options in the year
  ended December 31, 1994            -         -          -         261          -            -           (261)              - 

Amortization of 
  deferred
  compensation                       -         -          -           -          -            -            158             158 


Net change in unrealized 
  loss on available-for-sale
  securities                         -         -          -           -    (11,393)          -               -         (11,393)

Net loss                             -         -          -           -          -     (25,661)              -         (25,661)
                                ------     -------   -------    --------   -------     -------       ---------        --------

BALANCE,
  DECEMBER 31, 
  1994                               -        77          -      251,648   (11,393)    (26,045)        (1,709)         212,578 


Deferred compensation
  resulting from grant
  of options in the year
  ended December 31, 1995           -         -          -             2         -           -            (2)               - 

Amortization of 
  deferred
  compensation                      -         -         -              -         -           -           166              166 

Net change in unrealized 
  loss on available-for-sale
  securities                        -         -         -             -     11,131           -             -           11,131 

Net loss                            -         -         -             -          -           -             -          (59,403)
                               ------     -------   -------    --------   ---------     ---------     ---------      ----------
BALANCE,
  DECEMBER 31, 
  1995                           $  -     $  77      $  -     $ 251,650    $  (262) $  (85,448)    $  (1,545)        $164,472 
</TABLE>


                            SEE ACCOMPANYING NOTES.


                                      F-5

<PAGE>

                        THERAPEUTIC DISCOVERY CORPORATION
                         (A DEVELOPMENT STAGE COMPANY)
                        STATEMENT OF STOCKHOLDERS' EQUITY
            (IN THOUSANDS, EXCEPT NUMBER OF SHARES AND PER SHARE DATA)
<TABLE>
<CAPTION>
                                                                            Unrealized      Deficit
                                                                             losses on    Accumulated
                                           Class A    Class B   Additional   available-    During the                     Total
                                 Common     Common     Common    Paid-in     for-sale     Development   Deferred     Stockholders'
                                 Stock      Stock      Stock     Capital     securities      Stage     Compensation      Equity
                                --------  ---------  ---------  ----------  ------------  -----------  ------------  -------------
<S>                              <C>        <C>       <C>       <C>          <C>           <C>         <C>           <C>
Deferred compensation
  resulting from grant
  of options in the year
  ended December 31, 1996             -         -        -             -          -          -             -                  -


Amortization of 
  deferred
  compensation                        -         -        -             -          -                          326            326


Net change in unrealized 
  loss on available-for-sale
  securities                          -         -        -             -       (904)         -             -               (904)


Net loss                              -         -        -             -          -        (94,750)        -            (94,750)
                                 ------     -------   -------    --------   ---------     ---------     ---------      ----------
BALANCE,
  DECEMBER 31, 
  1996                            $  -     $   77    $   -    $  251,650  $  (1,166)     $(180,198)    $  (1,219)      $  69,144 
                                ------     -------   -------    --------   ---------     ---------     ---------      ----------
                                ------     -------   -------    --------   ---------     ---------     ---------      ----------
</TABLE>


                            SEE ACCOMPANYING NOTES.


                                     F-6
<PAGE>

                        THERAPEUTIC DISCOVERY CORPORATION
                          (A DEVELOPMENT STAGE COMPANY)

                       CONSOLIDATED STATEMENT OF CASH FLOWS
                INCREASES (DECREASES) IN CASH AND CASH EQUIVALENTS
                                 (IN THOUSANDS)

<TABLE>
<CAPTION>
                                                                                                Period from
                                                Year Ended     Year Ended     Year Ended         Inception
                                                December 31,   December 31,   December 31,   (November 1992) to
                                                   1996            1995          1994        December 31, 1996
                                                ------------   ------------   ------------   ------------------
<S>                                               <C>           <C>            <C>              <C>
CASH FLOWS FROM OPERATING ACTIVITIES:

  Net loss                                        $(94,750)     $(59,403)     $ (25,661)       $ (180,198)
  Adjustments to reconcile net loss
    to net cash used in operating activities:
    Amortization of organization costs                 716           716            716             2,566
    Amortization of deferred compensation              326           164            158               728
    (Increase) decrease in assets:
      Interest receivable                              618         1,021            127              (809)
      Other receivable                                   -             -           (252)             (252)
      Organization costs                                 -             -              -            (3,581)
      Prepaid expenses and other assets                339           123            130              (781)
    Increase (decrease) in liabilities:
      Payable to ALZA Corporation                    2,312         9,122          5,390            19,129  
      Accounts payable                                   4            (2)           (47)                5  
      Other current liabilities                        (80)           (4)            52                67  
      Long-term liabilities                            115             -              -               115  
                                                  --------     --------         -------         ----------
        Total adjustments                            4,350        11,140          6,274            17,187   
                                                  --------     --------         -------         ----------
          Net cash used in operating activities    (90,400)      (48,263)       (19,387)         (163,011)

CASH FLOWS FROM INVESTING ACTIVITIES:

  Investments in available-for-sale securities     (25,667)      (42,863)      (294,121)       (1,363,067) 
  Sale of available-for-sale securities             98,523        81,349        194,134           586,674  
  Maturities of available-for-sale securities       14,827         3,041        137,918           700,523  
  Employee loans, long-term                              -             -              -              (300)
                                                  --------     --------         -------         ----------
        Net cash provided by (used in) investing
          activities                                87,683        41,527         37,931           (76,170)


CASH FLOWS FROM FINANCING ACTIVITIES:

  Issuance of Class B Common Stock                       -            -               -                  2  
  Issuance of Class A Common Stock, net of 
    issuance costs                                       -            -               -            249,776  
                                                  --------     --------         -------         ----------
        Net cash provided by financing 
          activities                                     -            -               -            249,778  
                                                  --------     --------         -------         ----------

Net increase (decrease) in cash and cash 
  equivalents                                       (2,717)      (6,736)         18,544             10,597  

Cash and cash equivalents at beginning of period    13,314       20,050           1,506                  -  
                                                  --------     --------         -------         ----------

Cash and cash equivalents at end of period        $ 10,597     $ 13,314         $20,050         $   10,597  
                                                  --------     --------         -------         ----------
                                                  --------     --------         -------         ----------
</TABLE>


                            SEE ACCOMPANYING NOTES.


                                     F-7
<PAGE>

                                             Therapeutic Discovery Corporation
                                                 (a development stage company)
                                                             December 31, 1996


                           NOTES TO FINANCIAL STATEMENTS

1.  ORGANIZATION AND SIGNIFICANT ACCOUNTING POLICIES

  Therapeutic Discovery Corporation ("TDC") was incorporated in Delaware on 
November 12, 1992 and commenced operations on June 11, 1993.  Since it 
commenced operations, TDC has been engaged in selecting and developing new 
human pharmaceutical products combining the proprietary drug delivery systems 
of ALZA Corporation ("ALZA") with various drug compounds.  TDC's principal 
activities consist of research and development activities under its 
agreements with ALZA.  Accordingly, TDC is considered a development stage 
company.

  TDC incurred research and development expenses of approximately $100.0 
million during 1996, $68.9 million during 1995, and $31.6 million during 
1994.  Research and development expenses have totaled approximately $205.4 
million for the period from inception (November 1992) to December 31, 1996.  
Based on TDC's current rate of expenditures on TDC products, it is expected 
that funds for product development will be exhausted in the second half of 
1997 and product development funding by TDC will cease.  When cash available 
for product development is exhausted, ALZA's purchase option with respect to 
all of TDC's Class A Common Stock and option to license TDC products on a 
product-by-product basis will be triggered, as described more fully in Note 2 
below.  The Board of Directors of TDC has initiated activities to establish a 
contingency plan for the continued operations of TDC in the event that ALZA 
chooses not to exercise the purchase option, and has the right, under its 
agreements with ALZA, to take necessary steps to cease development funding 
and maintain an adequate level of available funds to ensure TDC's ability to 
meet its operating cash needs through at least December 31, 1997.

    A summary of the significant accounting policies of TDC follows:

  USE OF ESTIMATES:

  The preparation of the financial statements in conformity with generally 
accepted accounting principles requires management to make estimates and 
assumptions that affect the amounts reported in the financial statements and 
accompanying notes.  Actual results could differ from those estimates.


                                     F-8
<PAGE>




                                             Therapeutic Discovery Corporation
                                                 (a development stage company)
                                                             December 31, 1996

  CASH AND CASH EQUIVALENTS:

  TDC reports all highly liquid debt instruments purchased with a maturity of 
three months or less as cash equivalents.  The carrying amount reported on 
the balance sheet for cash and cash equivalents approximates their fair value.

  SHORT-TERM INVESTMENTS:

  TDC has classified its entire investment portfolio, including cash 
equivalents of approximately $85 million and $177 million at December 31, 
1996 and 1995, respectively, as available-for-sale. TDC's investment 
portfolio is available for current operations and, therefore, has been 
classified as a current asset.  Investments in the available-for-sale 
category are carried at fair market value with unrealized losses recorded as 
a separate component of stockholders' equity.  At December 31, 1996, net 
unrealized losses on available-for-sale securities were approximately $1.2 
million.  At December 31, 1995, net unrealized losses on available-for-sale 
securities were approximately $0.3 million.  Realized gains and losses for 
the years ended December 31, 1996 and 1995 were not material.  The cost of 
securities when sold is based upon specific identification.

  The following is a summary of available-for-sale securities at December 31, 
1996:

<TABLE>
<CAPTION>
                                             Available-for-Sale Securities
                                 ----------------------------------------------------
                                                                          Estimated
                                              Unrealized    Unrealized       Fair
(in thousands)                     Cost          Gains        Losses         Value
                                 ---------    ----------    ----------    -----------
<S>                              <C>             <C>         <C>          <C>   
U.S. Treasury securities
  and obligations of U.S. 
  government agencies            $ 37,921       $   8        $ (370)      $ 37,559

Collateralized mortgage
  obligations and asset 
  backed securities                22,340           4           (517)        21,827

Corporate securities               24,478           7           (298)        24,187
                                 --------       -----        -------      ---------
                                 $ 84,739       $  19        $(1,185)     $  83,573
                                 --------       -----        -------      ---------
                                 --------       -----        -------      ---------
</TABLE>


                                    F-9
<PAGE>

                                             Therapeutic Discovery Corporation
                                                 (a development stage company)
                                                             December 31, 1996

  The following is a summary of available-for-sale securities at December 31, 
1995:

<TABLE>
<CAPTION>
                                             Available-for-Sale Securities
                                 ----------------------------------------------------
                                                                          Estimated
                                              Unrealized    Unrealized       Fair
(in thousands)                     Cost          Gains        Losses         Value
                                 ---------    ----------    ----------    -----------
<S>                              <C>           <C>           <C>          <C>   
U.S. Treasury securities
  and obligations of U.S. 
  government agencies            $  89,526     $    288      $  (167)     $  89,647

Collateralized mortgage
  obligations and asset 
  backed securities                 39,061           11         (363)        38,709

Corporate securities                47,858           47          (78)        47,827
                                 ---------     --------      -------      ---------
                                 $ 176,445     $    346      $  (608)     $ 176,183
                                 ---------     --------      -------      ---------
                                 ---------     --------      -------      ---------

</TABLE>

  The amortized cost and estimated fair value of debt and marketable 
securities at December 31, 1996, by contractual maturity, are shown below.  
Expected maturities will differ from contractual maturities because the 
issuers of the securities may have the right to prepay obligations without 
prepayment penalties.


                                                   Estimated
                                                      Fair
(in thousands)                       Cost            Value 
                                 ----------       -----------
Due in one year or less          $   36,938       $    36,611
Due after one year through
  four years                         40,814            40,118
Due after four years through 
  eight years                         6,987             6,844
                                 ----------       -----------
                                 $   84,739       $    83,573
                                 ----------       -----------
                                 ----------       -----------


                                   F-10
<PAGE>

                                             Therapeutic Discovery Corporation
                                                 (a development stage company)
                                                             December 31, 1996

  INVESTMENT RISK:

  TDC invests excess cash in money market and fixed income securities of 
companies with strong credit ratings, from a variety of industries, and in 
U.S. government obligations.  These securities typically bear minimal credit 
risk and TDC has not experienced any losses on its investments to date due to 
credit risk.  

  ORGANIZATION COSTS:

  Organization costs totaling approximately $3.6 million were incurred in 
developing TDC's organizational, financial and contractual structures and are 
being amortized over 60 months using the straight line method.

  STOCK BASED COMPENSATION:

  The Company accounts for stock option grants in accordance with APB Opinion 
No. 25, ACCOUNTING FOR STOCK ISSUED TO EMPLOYEES.  The Company grants certain 
stock options for a fixed number of shares to employees, directors and 
consultants with an exercise price below the fair value at the date of grant 
and, accordingly, recognizes deferred compensation from the date of the grant.

  PER SHARE INFORMATION:

  Per share information is based on 7,734,524 shares (including Class A and 
Class B Common Stock) outstanding for the entire period from inception 
(November 1992) to December 31, 1996.  Common equivalent shares are excluded 
as their effect is antidilutive.

2.  ARRANGEMENTS WITH ALZA CORPORATION

  TDC was formed by ALZA for the purpose of selecting and developing new 
human pharmaceutical products combining ALZA's proprietary drug delivery 
technologies with various drug compounds, and commercializing such products, 
most likely through licensing to ALZA.  In connection with the dividend 
discussed below, ALZA made a $250 million cash contribution to TDC's capital, 
which is being used primarily to fund activities under the development 
contract described below.


                                     F-11
<PAGE>

                                             Therapeutic Discovery Corporation
                                                 (a development stage company)
                                                             December 31, 1996


  In March 1993, ALZA announced a special dividend of units (each, a "Unit") 
to ALZA stockholders, each Unit consisting of one share of TDC Class A Common 
Stock and one warrant to purchase one-eighth of one share of ALZA Common 
Stock at an exercise price of $65 per share.  Holders of record of ALZA 
Common Stock on May 28, 1993 received one Unit for every 10 shares of ALZA 
Common Stock held, with cash distributed in lieu of fractional Units.  A 
total of 7,734,424 Units were distributed to ALZA stockholders on June 11, 
1993.  As a result of the distribution, all of the outstanding shares of TDC 
Class A Common Stock were distributed to ALZA stockholders.  ALZA continues 
to hold all of the outstanding shares of TDC Class B Common Stock. 

  In accordance with TDC's Restated Certificate of Incorporation, on June 11, 
1996, the Units separated into their component securities--TDC Class A Common 
Stock and ALZA warrants.  As a result of the separation, both securities are 
listed and trade independently on the Nasdaq Stock Market.  The trading symbol 
for the TDC Class A Common Stock is "TDCA".

  ALZA and TDC are parties to a development agreement (the "Development 
Contract") pursuant to which ALZA conducts research and development 
activities on behalf of TDC.  Under the Development Contract, products have 
been proposed by ALZA to TDC for development.  For products approved for 
development by TDC, ALZA (and/or other third parties) conducts research and 
development activities under approved work plans and cost estimates.  ALZA 
has granted to TDC a royalty-free, exclusive, worldwide perpetual license to 
use ALZA's proprietary drug delivery technology to develop and commercialize 
TDC products.

  For activities under the Development Contract, TDC incurred research and 
development expenses of approximately $100.0 million during 1996, as compared 
with $68.9 million during 1995, and $31.6 million during 1994.  As 
development activities continue during 1997, TDC's research and development 
expenses are expected to continue until the funds contributed to TDC by ALZA 
in 1993, plus any investment income earned thereon, less organization costs 
and administrative expenses (including reasonable reserves for TDC 
operations) are utilized.

  ALZA has an option to license any products developed by TDC, on a 
country-by-country product-by-product basis.  If ALZA exercises its license 
option for any product, ALZA will make the following payments to TDC with 
respect to such product:

      (a) if the product is sold by ALZA, royalties of up to a maximum of 
    5% of ALZA's net sales of the product determined as follows:  (i) 1% 
    of net sales, plus (ii) an additional 0.1% of net sales for each full 
    $1 million of development costs of the


                                     F-12
<PAGE>

                                             Therapeutic Discovery Corporation
                                                 (a development stage company)
                                                             December 31, 1996

       product paid by TDC; and (b) if the product is sold by a third party, 
       sublicensing fees of up to 50% of ALZA's sublicensing revenues with 
       respect to the product, determined as follows:  (i) 10% of ALZA's 
       sublicensing revenues, plus (ii) an additional 1% of ALZA's 
       sublicensing revenues for each full $1 million of development costs of 
       the product paid by TDC.

  ALZA has an option, exercisable on a product-by-product basis, to buy out 
its royalty obligation to TDC by making a one-time payment that is a multiple 
of royalties and sublicensing fees paid in specified periods.  Such option 
may be exercised on a country-by-country or worldwide basis.  Since the 
beginning of 1997, ALZA has exercised its option to license TDC's 
second-generation transdermal testosterone product to follow ALZA's existing 
Testoderm-Registered Trademark- product from TDC for 12 European countries, 
and TDC's OROS-Registered Trademark- hydromorphone product for the entire world.

  ALZA also has an option, exercisable in ALZA's sole discretion, to 
purchase, according to a predetermined formula, all (but not less than all) 
of the outstanding shares of TDC Class A Common Stock (the "Purchase 
Option").  The Purchase Option is exercisable at any time until December 31, 
1999; provided that such date may be extended for successive one year periods 
if, as of any June 30 beginning with June 30, 1999, TDC has not used pursuant 
to the Development Contract at least 90% of the cash initially contributed to 
TDC by ALZA plus interest earned thereon less organization costs, TDC's 
administrative expenses (including reasonable reserves for operations), and 
the costs of the distribution to ALZA's stockholders.  The Purchase Option 
will expire, in any event, on the 60th day after TDC files with the 
Securities and Exchange Commission a Form 10-K or Form 10-Q containing a 
balance sheet showing less than an aggregate of $5 million in cash and cash 
equivalents, short-term investments and long-term investments.

  If the Purchase Option is exercised, the exercise price will be the 
greatest of:

    (a) $100 million;

    (b) the greater (i) of 25 times the worldwide royalties and sublicensing 
  fees paid by ALZA to TDC during four specified calendar quarters or (ii) 100 
  times such royalties and sublicensing fees during a specified calendar 
  quarter, in each case, less any amounts previously paid by ALZA to exercise 
  a buy-out option with respect to any product;

    (c) the fair-market value of one million shares of ALZA Common Stock, or 


                                     F-13
<PAGE>

                                             Therapeutic Discovery Corporation
                                                 (a development stage company)
                                                             December 31, 1996

    (d) $325 million less all amounts paid by TDC under the Development 
  Contract.

The purchase price may be paid in cash, in ALZA Common Stock, or any 
combination of the two, at the option of ALZA.

  Until the expiration of the Purchase Option, ALZA, as the sole holder of 
TDC's Class B Common Stock, will be entitled to vote separately as a class 
with respect to, and therefore could prevent, any merger or liquidation of 
TDC, the sale, lease, exchange, transfer or other disposition of any 
substantial asset of TDC, and any amendments to the Restated Certificate of 
Incorporation of TDC that would alter the Purchase Option, TDC's 
capitalization, or the provisions of the Restated Certificate of 
Incorporation concerning TDC's board of directors.

  ALZA performs certain administrative services for TDC under an annually 
renewable services agreement which is terminable at the option of TDC on 60 
days' notice.  Under this agreement, TDC reimburses ALZA for its 
fully-burdened costs.  Expenses incurred by TDC for administrative services 
rendered under this agreement were approximately $152,000 in 1996, as 
compared with $136,000 in 1995, and $206,000 in 1994.  The expenses incurred 
for the period from inception (November 1992) to December 31, 1996 were 
approximately $614,000. 

  The arrangements between ALZA and TDC are complex and are incorporated in 
various agreements between the parties and in TDC's Restated Certificate of 
Incorporation.

3.  STOCK OPTIONS

  TDC has a stock option plan under which 500,000 shares of Class A Common 
Stock have been reserved for issuance to employees, officers, directors 
and consultants.  During the period from inception (November 1992) to 
December 31, 1993, options to purchase 341,500 shares were granted.  In the 
year ended December 31, 1994, options to purchase 55,000 shares were granted 
to consultants.  In the year ended December 31, 1995, options to purchase 
2,000 shares were granted and options to purchase 1,500 shares were canceled. 
In the year ended December 31, 1996, the options to purchase 2,000 shares 
that were granted in 1995 were canceled.  All outstanding options have an 
exercise price of $1.00 per share, are exercisable in four equal annual 
installments beginning on June 11, 1996, and expire ten years after the date 
of grant.  As of December 31, 1996, 395,000 options were outstanding, 98,750 
of which were exercisable.  The weighted average remaining contractual life 
is 6.61 years for options outstanding at December 31, 1996.


                                     F-14
<PAGE>

                                             Therapeutic Discovery Corporation
                                                 (a development stage company)
                                                             December 31, 1996

     STOCK COMPENSATION PLAN

  TDC has elected to follow Accounting Principles Board Opinion No. 25, 
"Accounting for Stock Issued to Employees" ("APB 25") and related 
Interpretations in accounting for its employee stock options because the 
alternative fair value accounting provided for under FASB Statement No. 123, 
"Accounting for Stock-Based Compensation" ("FAS 123"), requires use of 
option valuation models that were not developed for use in valuing employee 
stock options.  The proforma compensation associated with the options granted 
in 1995 (none in 1996) is negligible.  TDC has, for financial statement 
presentation purposes, recorded deferred compensation expense equal to the 
difference, at the date of grant, between the exercise price and the market 
value on the date of grant of the Class A Common Stock underlying options 
granted during the relevant  periods.  This deferred compensation amount is 
being amortized to expense over the vesting period of the options.

4.  INCOME TAXES

  Significant components of TDC's deferred tax assets for federal and state 
income taxes for the two years ended December 31, 1996 and, 1995 are as follows:

(in thousands)

                                                 1996          1995  
                                              ----------    ---------
Net deferred tax assets:
  Capitalized research expenses               $   64,696    $  28,337  
  Capital loss carryover                           1,434        1,454  
  SFAS 115 unrealized losses                         479          108  
  Other                                              (39)         (39) 
                                              ----------    ---------
    Total deferred tax assets                     66,570       29,860 
    Less:  valuation allowance                   (66,570)     (29,860)
                                              ----------    ---------
Net deferred tax assets                       $        -    $       -  
                                              ----------    ---------
                                              ----------    ---------

  Because of the Company's lack of earnings history, the net deferred tax 
assets have been fully offset by a valuation allowance.  The valuation 
allowance increased by $36,710 in 1996 as compared with 1995 and by $14,719 
in 1995 as compared with 1994, and by $14,695 in 1994 as compared with 1993.


                                     F-15
<PAGE>

                                             Therapeutic Discovery Corporation
                                                 (a development stage company)
                                                             December 31, 1996


                                 EXHIBIT INDEX

EXHIBIT
 
  3.1    Restated Certificate of Incorporation of Therapeutic
         Discovery Corporation filed with the Delaware 
         Secretary of State on April 1, 1993. 

  3.2    Restated By-laws of Therapeutic Discovery Corporation
         dated January 26, 1994.

 10.1    Technology License Agreement between Therapeutic 
         Discovery Corporation and ALZA Corporation dated 
         March 10, 1993.

 10.2    Development Agreement between Therapeutic Discovery 
         Corporation and ALZA Corporation dated March 10, 1993.

 10.3    License Option Agreement between Therapeutic Discovery 
         Corporation and ALZA Corporation dated March 10, 1993.

 10.4   Services Agreement between Therapeutic Discovery 
        Corporation and ALZA Corporation dated March 10, 1993.

 10.5   Amended and Restated 1993 Stock Option Plan.

 10.6   Executive Deferral Plan.

 10.7   Agreement Regarding Certain Products and Activities
        and Amendment No. 1 to Development Agreement 
        between Therapeutic Discovery Corporation and
        ALZA Corporation.

 27     Financial Data Schedule

<PAGE>

                        RESTATED CERTIFICATE OF INCORPORATION
                                        OF
                          THERAPEUTIC DISCOVERY CORPORATION
                    (ORIGINALLY INCORPORATED ON NOVEMBER 12, 1992)


          FIRST:    NAME. The name of this corporation is Therapeutic 
Discovery Corporation (the "corporation").

          SECOND:   REGISTERED OFFICE; REGISTERED AGENT. The address of the 
registered office of this corporation in the State of Delaware is 1013 Centre 
Road, in the City of Wilmington, County of New Castle.  The name of the 
registered agent of this corporation at such address is Corporation Service 
Company.

          THIRD:    PURPOSE. The purpose of this corporation is to engage in 
any lawful act or activity for which corporations may be organized under the 
General Corporation Law of the State of Delaware.

          FOURTH:   AUTHORIZED CAPITAL STOCK.

          (A)  This corporation is authorized to issue two classes of shares, 
which shall be known as Class A Common Stock and Class B Common Stock.  The 
total number of shares of stock of all classes that this corporation is 
authorized to issue is 12,000,100.  The total number of shares of Class A 
Common Stock which this corporation is authorized to issue is 12,000,000.  
The total number of shares of Class B Common Stock which this corporation is 
authorized to issue is 100. Each share of Class A Common Stock and Class B 
Common Stock shall have a par value of $0.01.

          Effective immediately upon the filing of this Restated Certificate 
of Incorporation, each share of Common Stock, par value $1.00 per share, of 
this corporation outstanding immediately prior to such filing shall be 
converted into and reclassified as one share of Class B Common Stock.

          (B)  The powers, designations, preferences, and relative, 
participating, optional or other special rights granted to, and the 
qualifications, limitations and restrictions imposed upon, the Class A Common 
Stock and Class B Common Stock and the respective holders thereof are as 
follows:

               (1)  REDEMPTION. The shares of Class A Common Stock are 
     redeemable and may be redeemed as provided in (but only as provided in) 
     ARTICLE FIFTH, Section (F).

               (2)  DIVIDENDS.  The holders of shares of Class A Common Stock 
     and Class B Common Stock shall be entitled to receive per share and 
     without preference such dividends as may be declared by the Board of 
     Directors from time to time
     

<PAGE>

     out of funds legally available therefor. No dividend may be declared on 
     the Class A Common Stock unless the same per share dividend is declared 
     on the Class B Common Stock, and no dividend may be declared on the 
     Class B Common Stock unless the same per share dividend is declared on 
     the Class A Common Stock. Dividends may not be declared, nor may shares 
     of Class A Common Stock or Class B Common Stock be repurchased or 
     redeemed (other than pursuant to Section (F) of Article FIFTH) if, after 
     payment of such dividend, or after effecting such repurchase or 
     redemption, the amount of this corporation's cash, cash equivalents, 
     short and long term investments would be less than the amount of 
     Available Funds as of the date of such dividend, repurchase or 
     redemption.

               (3)  LIQUIDATION.  In the event of voluntary or involuntary 
     liquidation of this corporation, the holders of the Class A Common Stock 
     and Class B Common Stock of the corporation shall be entitled to 
     receive, on a pro rata per share basis and without preference, all of 
     the remaining assets of this corporation available for distribution to 
     its stockholders.

               (4)  VOTING RIGHTS. Except as otherwise required by law or 
     provided herein, the holders of Class A Common Stock and Class B Common 
     Stock shall vote together as a single class.  Each holder of Class A 
     Common Stock and Class B Common Stock shall have one vote for each share 
     standing in his or her name on all matters submitted to a vote of 
     holders of the common shares. At any meeting of the stockholders of this 
     corporation, the determination of a quorum shall be based upon the 
     presence of shares of Class A Common Stock and Class B Common Stock 
     representing a majority of the voting power of all of the shares of 
     Class A Common Stock and Class B Common Stock.  This corporation shall 
     not, without the affirmative vote of the holders of a majority of the 
     issued and outstanding shares of Class B Common Stock, voting separately 
     and as a class, (a) alter or change the powers, designations, 
     preferences and relative, participating, optional or other special 
     rights granted to, or the qualifications, limitations and restrictions 
     imposed upon, the Class A Common Stock or the Class B Common Stock, (b) 
     alter or change Articles FOURTH, FIFTH, SIXTH, SEVENTH or EIGHTH of this 
     Restated Certificate of Incorporation, (c) authorize the creation or 
     issuance of any additional class or series of stock, or otherwise make 
     any amendment to this Certificate of Incorporation that would alter the 
     rights of the holders of the Class B Common Stock, (d) undertake the 
     voluntary dissolution, liquidation or winding up of this corporation, 
     (e) merge or consolidate this corporation with or into any other 
     corporation or entity, (f) sell, lease, exchange, transfer or otherwise 
     dispose of any substantial asset of this corporation or (g) alter the 
     bylaws of this corporation in a manner
     

                                      -2-
<PAGE>

     described in the last sentence of ARTICLE EIGHTH. Furthermore, from and 
     after the Purchase Option Exercise Date, as defined in Article FIFTH, 
     (i) the board of directors of this corporation shall cease to be 
     classified; (ii) the number of directors of this corporation shall be 
     increased to a number equal to (a) two times the maximum number of 
     authorized directors (counting for this purpose both directors in office 
     and vacant directorships), PLUS (b) one; and (iii) the holders of the 
     Class B Common Stock shall have the sole right to elect the directors of 
     this corporation, including directors to fill the new directorships 
     created pursuant to clause (ii).  No vacancy created as a result of the 
     increase in the size of the board of directors pursuant to the preceding 
     sentence shall be filled other than by the holders of the Class B Common 
     Stock.

              (5)  CONVERSION.  The Class B Common Stock shall automatically 
     convert into fully paid and non-assessable shares of Class A Common 
     Stock of this corporation at 12:01 a.m. New York time on the day 
     immediately following the expiration of the Purchase Option granted in 
     Article FIFTH.  The Class B Common Stock shall convert into Class A 
     Common Stock at the rate of one share of Class A Common Stock for each 
     share of Class B Common Stock.

               (6)  TRANSFER OF CLASS A COMMON STOCK. Until the first to 
     occur of (i) the third anniversary of the date (the "Distribution Date") 
     upon which certificates representing Units comprised in part of shares 
     of Class A Common Stock are distributed by ALZA Corporation (together 
     with its successors and assigns, "ALZA") to the holders of ALZA's Class 
     A Common Stock or (ii) the Purchase Option Exercise Date, the Class A 
     Common Stock may be transferred only as part of Units. Each "Unit" 
     consists of one share of Class A Common Stock and one warrant to acquire 
     one-eighth of one share of ALZA Common Stock.

          FIFTH.    PURCHASE OPTION.

          (A)  DEFINITIONS.  For purposes of this Restated Certificate of 
Incorporation, the following terms shall have the following definitions:

          (1)  ALZA COMMON STOCK means the Class A Common Stock of ALZA or, 
if such Class A Common Stock is converted into or exchanged for another class 
or series of stock of ALZA or any other corporation, such other class or 
series of stock.

          (2)  AVAILABLE FUNDS means, as of any date of determination, the 
sum of (a) $250 million (contributed by ALZA in or about March 1993), PLUS 
(b) interest and other income earned through investment of such funds until 
their expenditure pursuant to the Development Contract through the date of


                                      -3-
<PAGE>

determination, LESS (c) reasonable ongoing administrative expenses of this 
corporation, including legal and accounting expenses, incurred through the 
date of determination, LESS (d) the costs associated with the distribution to 
ALZA's stockholders of the Units.

          (3)  DEVELOPMENT CONTRACT means the Development Agreement dated as 
of March 10, 1993 between ALZA and this corporation, as such contract may be 
amended or modified from time to time by amendments approved by ALZA and the 
board of directors of this corporation.

          (4)  FAIR MARKET VALUE means, with reference to ALZA Common Stock, 
(a) if ALZA Common Stock is listed on the New York Stock Exchange or any 
other securities exchange reporting closing sales prices (including without 
limitation the NASDAQ National Market System), the average of the closing 
sales price of ALZA Common Stock on such exchange (which shall be the New 
York Stock Exchange or, if ALZA Common Stock is not then traded on such 
exchange, on the principal exchange on which ALZA Common Stock is then 
traded), for the five trading days ending with the trading day that is two 
trading days prior to the date of determination, (b) if ALZA Common Stock is 
not listed on any securities exchange described in clause (a) but is quoted 
on NASDAQ or another quotation system providing bid prices, the average (over 
the five day period described in clause (a)) of the bid prices for each day 
in such period on NASDAQ (or, if ALZA Common Stock is not then quoted on 
NASDAQ, the largest quotation system on which ALZA Common Stock is then 
quoted), and (c) if ALZA Common Stock is not listed on any exchange or quoted 
on any quotation system, the value thereof as determined in good faith by 
ALZA's board of directors.

          (5)  FINAL PURCHASE OPTION EXERCISE PRICE means the Purchase Option 
Exercise Price MINUS (a) the amount by which this corporation's Liabilities 
existing at the Purchase Option Exercise Date (other than liabilities 
pursuant to the Development Contract) exceed the aggregate of this 
corporation's then existing cash, cash equivalents and short-term and 
long-term investments (but excluding from such cash, cash equivalents and 
short-term and long-term investments the amount of Available Funds determined 
as of the Purchase Option Exercise Date which had not, as of such date, been 
paid by this corporation in accordance with the Development Contract); and 
MINUS (b), if the Purchase Option Exercise Price was determined based upon the 
provisions of clause (c) of Section (A)(10) of this Article FIFTH, any 
additional amounts paid by this corporation pursuant to the Development 
Contract from the date of the last report of such expenditures provided by 
this corporation to ALZA pursuant to the Development Contract to the Purchase 
Option Exercise Date.

          (6)  LIABILITIES means, with respect to this corporation, (a) all 
liabilities required to be reflected or


                                      -4-
<PAGE>

reserved against in this corporation's financial statements under generally 
accepted accounting principles consistently applied ("GAAP"), (b) any 
guaranty of any indebtedness of another person and (c) any reimbursement or 
similar obligation with respect to any letter of credit issued for the 
account of this corporation or as to which this corporation is otherwise 
liable.  Liabilities of the type described in (b) and (c) shall be valued at 
the full amount of the potential liability of the corporation thereon.

          (7)  LICENSE AGREEMENT means any License Agreement between ALZA and 
this corporation entered into upon the exercise by ALZA of the license option 
granted to it pursuant to the License Option Agreement.

          (8)  LICENSE OPTION AGREEMENT means the License Option Agreement 
between ALZA and this corporation dated as of March 10, 1993, as such 
agreement may be amended or modified from time to time by amendments approved 
by ALZA and the board of directors of this corporation.

          (9)  PURCHASE OPTION EXERCISE DATE means the date upon which ALZA 
notifies this corporation in writing of its exercise of the Purchase option 
as provided in Section (C) of this Article FIFTH.

          (10) PURCHASE OPTION EXERCISE PRICE means the greatest of the 
following:

               (a)  the greater of (i) 25 times the Royalties paid by or due 
     from ALZA to this corporation, PLUS 25 times any Royalties that would 
     have been paid by or due from ALZA to this corporation if ALZA had not 
     exercised its right to buy out its obligation to pay any such Royalties 
     as provided in Section 7.5 of the Development Contract or Section 3.4 of 
     any License Agreement, in each case determined with reference to the 
     most recent four complete calendar quarters preceding the Purchase 
     Option Exercise Date for which such Royalties were paid by or due from 
     ALZA or would have been paid by or due from ALZA, or (ii) 100 times such 
     Royalties paid by or due from ALZA to this corporation during the most 
     recent complete calendar quarter for which such Royalties were paid or 
     due; PROVIDED, that in the case of either (i) or (ii) the amount so 
     determined shall be reduced by any amounts previously paid by ALZA to 
     this corporation to buy out any obligation to pay Royalties as provided 
     in the Development Contract or any License Agreement;

               (b)  the Fair Market Value of one million shares of ALZA 
     Common Stock (which number of shares shall be proportionately adjusted 
     for any stock dividend, split-up, combination or reclassification of the 
     ALZA Common Stock) determined as of the Purchase Option Exercise Date;


                                      -5-
<PAGE>

               (c)  $325 million LESS the total amount paid by this 
     corporation under the Development Contract as last reported by this 
     corporation to ALZA through the Purchase Option Exercise Date; and

               (d)  $100 million.

          (11) PURCHASE OPTION EXPIRATION TIME means 11:59 p.m. New York time 
on December 31, 1999; provided that such date will be extended for successive 
one year periods if, as of any June 30 beginning with June 30, 1999, this 
corporation has not paid at least 90% of all Available Funds pursuant to the 
Development Contract.  Notwithstanding the foregoing sentence, the Purchase 
Option Expiration Time will in no event occur later than 11:59 p.m. New York 
time on the 60th day after the later of (a) the date of filing with the 
Securities and Exchange Commission or (b) the due date of this corporation's 
Annual Report on Form 10-K or Quarterly Report on Form 10-Q containing a 
balance sheet showing that this corporation has less than an aggregate of $5 
million in cash, cash equivalents, and short-term and long-term investments.

          (12) ROYALTIES means (a) royalties paid or other payments made by 
ALZA to this corporation under a License Agreement in respect of any product 
licensed by ALZA from this corporation pursuant to the License Option 
Agreement and (b) payments made by ALZA under Section 7.4 of the Development 
Contract. In determining the amount of Royalties for purposes of Article 
FIFTH, Section (A)(10)(a), all Special Royalty Payments are to be amortized 
equally over a period of 28 calendar quarters beginning with the calendar 
quarter in which such Special Royalty Payment is made, regardless of the 
treatment of such Special Royalty Payments in determining Royalties actually 
paid under any License Agreement or the Development Contract.

          (13) SPECIAL ROYALTY PAYMENT means front-end distribution fees, 
prepaid royalties and similar one-time, infrequent or special payments.

          (14) STATUS STATEMENT means, as of any date, a balance sheet dated 
as of such date, together with (a) a statement and brief description of all 
other liabilities of this corporation constituting Total Liabilities as of 
such date not reflected on such balance sheet, (b) a statement of the amount 
of Available Funds remaining as of such date, and (c) a statement of the 
total amounts paid by this corporation pursuant to the Development Contract 
through such date.

          (15) TOTAL LIABILITIES means, with respect to this corporation, (a) 
all Liabilities and (b) any other debts, liabilities or obligations, absolute 
or contingent, matured or unmatured, liquidated or unliquidated, accrued or 
unaccrued, known or unknown, whenever arising, including all costs and 
expenses relating thereto, and including those debts, liabilities


                                      -6-
<PAGE>

and obligations arising under law, rule or regulation, or under any pending 
or threatened action, suit or proceeding, or any order or consent decree of 
any governmental entity or any award of any arbitrator of any kind, and those 
arising under any contract, commitment or undertaking.

          (B)  GRANT OF OPTION.  ALZA is hereby granted an exclusive 
irrevocable purchase option to purchase all issued and outstanding shares of 
Class A Common Stock of this corporation for the Final Purchase Option 
Exercise Price (the "Purchase Option").  The Purchase Option, if exercised, 
must be exercised as to all, but not less than all, issued and outstanding 
shares of Class A Common Stock and may be exercised at any time at or prior 
to the Purchase Option Expiration Time.  ALZA shall elect, at the time of 
exercise of the Purchase Option, to pay all or any portion of the Final 
Purchase Option Exercise Price in cash, ALZA Common Stock (valued at its Fair 
Market Value determined as of the Purchase Option Exercise Date), or any 
combination thereof.  The Purchase Option may, at ALZA's option, be assigned 
or otherwise transferred to any person or entity, including this corporation.

          (C)  MANNER OF EXERCISE.  The Purchase Option shall be exercised at 
or before the Purchase Option Expiration Time by written notice (the 
"Exercise Notice") from ALZA to this corporation stating that the Purchase 
Option is being exercised and setting forth (1) the Purchase Option Exercise 
Price; (2) the portion, if any, of the Purchase Option Exercise Price to be 
paid in cash and the portion, if any, of the Purchase Option Exercise Price 
to be paid in ALZA Common Stock, and if any portion of the Purchase Option 
Exercise Price is to be paid in ALZA Common Stock, stating the Fair Market 
Value of such ALZA Common Stock determined as of the Purchase Option Exercise 
Date, and (3) a closing date (the "Closing Date") on which all of the issued 
and outstanding shares of Class A Common Stock will be purchased.  The 
Purchase Option shall be deemed to be exercised as of the date of mailing by 
first class mail of the Exercise Notice to this corporation.

          (D)  CLOSING.

          (1)  CLOSING DATE; COOPERATION. Except as set forth below, the 
Closing Date shall be the date specified as such in the Exercise Notice, 
which date specified shall be no later than 90 days after the Purchase Option 
Exercise Date. The Closing Date may be extended by ALZA if, in the judgment 
of ALZA, an extension of the Closing Date is necessary to obtain any 
governmental or third party consent to the purchase of the Class A Common 
Stock, to permit any necessary registration statement or similar filing to be 
declared effective, or to permit the expiration prior to the Closing Date of 
any statutory or regulatory waiting period. ALZA may extend the Closing Date 
for the reasons set forth in the preceding sentence by delivering written 
notice of such extension to this corporation on or prior


                                      -7-
<PAGE>

to the previously scheduled Closing Date.  This corporation shall cooperate 
with ALZA to effect the closing of the Purchase Option, including without 
limitation seeking any required third-party or governmental consents, and 
filing any applications, notifications, registration statements or the like 
which may be necessary to effect the closing.

          (2)  CERTAIN RESTRICTIONS FOLLOWING PURCHASE OPTION EXERCISE DATE. 
From the Purchase Option Exercise Date until the Closing Date, this 
corporation will not take any of the following actions (or permit any such 
actions to be taken on its behalf) except with the prior written consent of 
ALZA:

               (a)  borrow money, or mortgage, remortgage, pledge, 
     hypothecate or otherwise encumber any of its assets;
     
               (b)  sell, lease, lend, exchange or otherwise dispose of any 
     of its assets, other than sales of inventory in the ordinary course of 
     business;
     
               (c)  pay or declare any dividends or make any distributions on 
     or in respect of any shares of its capital stock;
     
               (d)  default in its obligations under any material contract, 
     agreement, commitment or undertaking of any kind or enter into any 
     material contract, agreement, purchase order or other commitment; or
     
               (e)  enter into any other transaction or agreement or 
     arrangement, or incur any liabilities, not in the ordinary course of 
     this corporation's business.
     
          (3)  DETERMINATION OF FINAL PURCHASE OPTION EXERCISE PRICE.  Not 
later than 15 business days following the Purchase Option Exercise Date, this 
corporation shall deliver a final Status Statement to ALZA prepared as of the 
Purchase Option Exercise Date. Following receipt of such Status Statement and 
completion of any other investigation as ALZA shall deem necessary or 
appropriate, and prior to the Closing Date, ALZA shall determine the Final 
Purchase Option Exercise Price by making the adjustments to the Purchase 
Option Exercise Price contemplated by Section (A)(5) of this Article FIFTH 
and shall notify this corporation of such determination.

          (4)  PAYMENT OF FINAL PURCHASE OPTION EXERCISE PRICE.  On or before 
the Closing Date, ALZA shall deposit the full amount of the Final Purchase 
Option Exercise Price with a bank or banks or similar entities designated by 
ALZA (which may include ALZA's transfer agent if shares of ALZA Common Stock 
are being delivered) to pay, on ALZA's behalf, the Final Purchase Option 
Exercise Price (the "Payment Agent").  Funds, if any, and ALZA Common Stock, 
if any, deposited with the Payment Agent shall be delivered in trust for the 
benefit of the holders of Class A


                                      -8-
<PAGE>

Common Stock, and ALZA shall provide the Payment Agent with irrevocable 
instructions to pay, on or after the Closing Date, the Final Purchase Option 
Exercise Price for the shares of Class A Common Stock to the holders of 
record thereof determined as of the Closing Date.  Payment for shares of 
Class A Common Stock shall be mailed to each holder at the address set forth 
in this corporation's records or at the address provided by each holder or, 
if no address is set forth in this corporation's records for a holder or 
provided by such holder, to such holder at the address of this corporation.  
At ALZA's request, this corporation shall provide, or shall cause its 
transfer agent to provide, to ALZA or to the Payment Agent, free of charge, a 
complete list of the record holders of shares of Class A Common Stock, 
including the number of shares of Class A Common Stock held of record and the 
address of each record holder.

          (E)  TRANSFER OF TITLE. Transfer of title to all of the issued and 
outstanding shares of Class A Common Stock shall be deemed to occur 
automatically on the Closing Date and thereafter this corporation shall be 
entitled to treat ALZA as the sole holder of all of the issued and 
outstanding shares of its Class A Common Stock, notwithstanding the failure 
of any holder of Class A Common Stock to tender the certificates representing 
such shares to the Payment Agent. This corporation shall instruct its 
transfer agent not to accept any shares of Class A Common Stock for transfer 
on and after the Closing Date, except for the shares of Class A Common Stock 
transferred to ALZA. This corporation shall take all actions reasonably 
requested by ALZA to assist in effectuating the transfer of shares of Class A 
Common Stock in accordance with this Article FIFTH.

          (F)  REDEMPTION OF CLASS A COMMON STOCK. At ALZA's election (which 
election may be made at any time, provided it is made, by delivery of written 
notice thereof to this corporation, not less than five days prior to the 
Closing Date), this corporation shall, subject to applicable restrictions in 
the Delaware General Corporation Law, redeem on the Closing Date all issued 
and outstanding shares of Class A Common Stock for an aggregate redemption 
price equal to the Final Purchase Option Exercise Price.

          SIXTH.    PROTECTIVE PROVISIONS.

          (A)  LEGEND. Certificates evidencing shares of Class A Common Stock 
issued by or on behalf of this corporation shall bear a legend in 
substantially the following form:

          "The shares of Therapeutic Discovery Corporation evidenced hereby 
are subject to an option in favor of ALZA Corporation, its successors and 
assigns, as described in the Restated Certificate of Incorporation of 
Therapeutic Discovery Corporation to purchase such shares at a purchase price 
determined in accordance with Article FIFTH thereof exercisable


                                      -9-
<PAGE>

by notice delivered to this Corporation at or prior to the Purchase Option 
Expiration Time (as defined in the Restated Certificate of Incorporation of 
Therapeutic Discovery Corporation). Copies of the Restated Certificate of 
Incorporation of Therapeutic Discovery Corporation are available at the 
principal place of business of Therapeutic Discovery Corporation at 1290 Page 
Mill Road, P.0. Box 10950, Palo Alto, California 94303-0860 and will be 
furnished to any stockholder on request and without cost."

          (B)  NO CONFLICTING ACTION. This corporation shall not take, nor 
permit any other person or entity within its control to take, any action 
inconsistent with ALZA's rights under Article FIFTH.  This corporation shall 
not enter into any arrangement, agreement or understanding, whether oral or 
in writing, that is inconsistent with or limits or impairs the rights of ALZA 
and the obligations of this corporation hereunder, including without 
limitation any arrangement, agreement or understanding which imposes any 
obligation upon this corporation, or deprives this corporation of any 
material rights, as a consequence of the exercise of the Purchase Option or 
the acquisition of the outstanding Class A Common Stock pursuant thereto.

          (C)  INSPECTION AND VISITATION RIGHTS; STATUS STATEMENTS.  ALZA 
shall have the right to inspect and copy, on reasonable notice and during 
regular business hours, the books and records of this corporation. ALZA shall 
also have the right to request from time to time (but not more frequently 
than monthly) a Status Statement as of such date as ALZA may request. Each 
Status Statement shall be sent within seven days of request by ALZA. ALZA 
shall also have the right to send a non-voting representative to attend all 
meetings of this corporation's board of directors and any committees thereof. 
Such representative shall receive notice of all meetings of this 
corporation's board of directors and each committee thereof, as well as 
copies of all documents and other materials provided to any directors of this 
corporation in connection with any such meeting not later than the time such 
materials are provided to other directors. Such representative shall also be 
provided with copies of all resolutions adopted or proposed to be adopted by 
unanimous written consent not later than the time such resolutions are 
provided to other directors.

          SEVENTH:  BOARD OF DIRECTORS.

          (A)  The number of directors which shall constitute the whole Board 
of Directors of this corporation shall initially be three, but may be 
increased or decreased from time to time by a resolution duly adopted by the 
Board of Directors.

          (B)  Nomination of candidates for election to the Board of 
Directors shall be made as provided in the bylaws of this corporation. 
Election of directors need not be by written ballot.


                                      -10-
<PAGE>

          (C)  The Board of Directors shall be and is divided into three 
classes: Class I, Class II and Class III, which shall be as nearly equal in 
number as possible. Each director shall serve for a term ending on the date 
of the third annual meeting of stockholders following the annual meeting at 
which the director was elected; provided, however, that each initial director 
in Class I shall hold office until the annual meeting of stockholders in 
1994; each initial director in Class II shall hold office until the annual 
meeting of stockholders in 1995; and each initial director in Class III shall 
hold office until the annual meeting of stockholders in 1996. Notwithstanding 
the foregoing provisions of this Article, each director shall serve until his 
successor is duly elected and qualified or until his death, resignation or 
removal.

          (D)  In the event of any increase or decrease in the authorized 
number of directors, the newly created or eliminated directorships resulting 
from such increase or decrease shall be apportioned by the Board of Directors 
among the three classes of directors so as to maintain such classes as nearly 
equal as possible.  No decrease in the number of directors constituting the 
Board of Directors shall shorten the term of any incumbent director.

          (E)  Except as otherwise provided in Article FOURTH, Section 
(B)(4), newly created directorships resulting from any increase in the number 
of directors and any vacancies on the Board of Directors resulting from 
death, resignation, disqualification, removal or other cause shall be filled 
by the affirmative vote of a majority of the remaining directors then in 
office (and not by stockholders), even though less than a quorum of the Board 
of Directors. Any director elected in accordance with the preceding sentence 
shall hold office for the remainder of the full term of the class of 
directors in which the new directorship was created or the vacancy occurred 
and until such director's successor shall have been elected and qualified.

          (F)  The name and mailing address of each person who is to serve as 
a director until the annual meeting of the stockholders entitled to vote for 
the class or until a successor is elected and qualified are as follows:


    NAME                       MAILING ADDRESS              CLASS
                             
    Dr. Pieter P. Bonsen      950 Page Mill Road,             I
                              Palo Alto, CA 94303
                             
    Adrian M. Gerber          950 Page Mill Road,             II
                              Palo Alto, CA 94303
                             
    Dr. Felix Theeuwes        950 Page Mill Road,             III
                              Palo Alto, CA 94303

          (G)  The board of directors of this corporation shall cease to be 
classified as provided in this Article SEVENTH from


                                      -11-
<PAGE>

and after the Purchase Option Exercise Date.  From and after such date all 
directors shall be elected to one year terms; provided the term of any 
director then in office shall not be reduced.

          EIGHTH:   BYLAWS.  In furtherance and not in limitation of the 
powers conferred by statute, and subject to the next sentence, the Board of 
Directors and the stockholders of this corporation are each expressly 
authorized to adopt, amend or repeal the bylaws of this corporation subject 
to any particular provisions concerning amendments set forth in this 
Certificate of Incorporation or the bylaws of this corporation.  No amendment 
to the bylaws may be adopted by the stockholders without the approval of 
holders of a majority of the Class B Common Stock voting separately as a 
class if such amendment would affect the classification of the Board of 
Directors, or would otherwise regulate the conduct of the Board's affairs or 
the manner in which it may act.

          NINTH:    STOCKHOLDER MEETINGS.

          (A)  SPECIAL MEETINGS. Special meetings of the stockholders for any 
purpose or purposes whatsoever may be called at any time only by the Board of 
Directors, the Chairman of the Board or the President of this corporation.

          (B)  NO ACTION WITHOUT MEETING.  At any time when this corporation 
has more than one stockholder of any class of capital stock, no action 
required to be taken or which may be taken at any annual or special meeting 
of the stockholders may be taken without a meeting, and the power of 
stockholders to consent in writing, without a meeting, to the taking of any 
action is specifically denied. Notwithstanding the foregoing, the holder or 
holders of the Class B Common Stock may take any action permitted to be taken 
by such holders as a class by written consent without a meeting.

          TENTH:    LIMITATION OF LIABILITY AND INDEMNIFICATION OF DIRECTORS.

          (A)  ELIMINATION OF CERTAIN LIABILITY OF DIRECTORS.  No director of 
this corporation shall be personally liable to this corporation or its 
stockholders for monetary damages for breach of fiduciary duty as a director, 
except for liability (i) for any breach of the director's duty of loyalty to 
this corporation or its stockholders, (ii) for acts or omissions not in good 
faith or which involve intentional misconduct or a knowing violation of law, 
(iii) under section 174 of the Delaware General Corporation Law or (iv) for 
any transaction from which the director derived an improper, personal benefit.

          (B)  INDEMNIFICATION AND INSURANCE.

          1.   RIGHT TO INDEMNIFICATION.  Each person who was or is made a 
party or is threatened to be made a party to or is


                                      -12-
<PAGE>

involved in any action, suit or proceeding, whether civil, criminal, 
administrative or investigative (a "proceeding"), because he or she, or a 
person of whom he or she is the legal representative, is or was a director or 
officer of this corporation or is or was serving at the request of this 
corporation as a director, officer, employee or agent of another corporation 
or of a partnership, joint venture, trust or other enterprise (including 
service with respect to employee benefit plans), whether the basis of the 
proceeding is alleged action in an official capacity as a director, officer, 
employee or agent or in any other capacity while serving as a director, 
officer, employee or agent, shall be indemnified and held harmless by this 
corporation to the fullest extent authorized by the Delaware General 
Corporation Law, as the same exists or may hereafter be amended (but, in the 
case of any such amendment, only to the extent that such amendment permits 
this corporation to provide broader indemnification rights than that law 
permitted this corporation to provide before such amendment), against all 
expense, liability and loss (including attorney's fees, judgments, penalties, 
fines, Employee Retirement Income Security Act of 1974 excise taxes or 
penalties, and amounts paid or to be paid in settlement) reasonably incurred 
or suffered by such person in connection therewith; provided, however, that 
this corporation shall indemnify any such person seeking indemnification in 
connection with a proceeding (or part thereof) initiated by such person only 
if the proceeding (or part thereof) was authorized by the Board of Directors 
of this corporation. Such indemnification shall continue as to a person who 
has ceased to be a director, officer, employee or agent and shall inure to 
the benefit of his or her heirs, executors and administrators. The right to 
indemnification conferred by this Section shall be a contract right which may 
not be retroactively amended and shall include the right to be paid by this 
corporation the expenses incurred in defending any such proceeding in advance 
of its final disposition; provided, however, that, if the Delaware General 
Corporation Law requires the payment of such expenses incurred by a director 
or officer in his or her capacity as a director or officer (and not in any 
other capacity in which service was or is rendered by such person while a 
director or officer, including, without limitation, service with respect to 
an employee benefit plan) in advance of the final disposition of the 
proceeding, such payment shall be made only upon delivery to this corporation 
of an undertaking, by or on behalf of such director or officer, to repay all 
amounts so advanced if ultimately it shall be determined that such director 
or officer is not entitled to be indemnified under this section or otherwise. 
This corporation may, by action of its Board of Directors, provide 
indemnification to employees and agents of this corporation with the same 
scope and effect as the indemnification of directors and officer

          2.   NONEXCLUSIVITY OF RIGHTS. The right to indemnification and the 
payment of expenses incurred in defending a proceeding in advance of its 
final disposition conferred in this Section shall not be exclusive of any 
other right which any


                                      -13-
<PAGE>

person may have or hereafter acquire under any statute, provision of this 
Certificate of Incorporation, bylaw, agreement, vote of stockholders or 
disinterested directors, or otherwise.

          3.   INSURANCE.  This corporation may maintain insurance, at its 
expense, to protect itself and any director, officer, employee or agent of 
this corporation or another corporation, partnership, joint venture, trust or 
other enterprise against any such expenses, liability or loss, whether or not 
this corporation would have the power to indemnify such person against such 
expense, liability or loss under the Delaware General Corporation Law.



                                      -14-
<PAGE>

          IN WITNESS WHEREOF, the undersigned officers have executed this
Restated Certificate of Incorporation on March 30, 1993 and do hereby certify
that this Restated Certificate of Incorporation, which restates and integrates,
and also further amends, the provisions of this Corporation's Certificate of
Incorporation, was duly adopted by the stockholders of this Corporation in
accordance with Sections 242 and 245 of the Delaware General Corporation Law.


                                      THERAPEUTIC DISCOVERY CORPORATION


                                      By: /s/ Pieter P. Bonsen
                                         ----------------------------------
                                          Dr. Pieter P. Bonsen,
                                          President, Therapeutic Discovery
                                          Corporation
           

ATTEST:


 /s/ Mary M. Roensch
- -----------------------------------
Mary M. Roensch, Secretary,
Therapeutic Discovery Corporation



                                      -15-


<PAGE>

                                 RESTATED BYLAWS
                                        OF
                        THERAPEUTIC DISCOVERY CORPORATION
                         

                     REGISTERED OFFICE AND REGISTERED AGENT

     l.   REGISTERED OFFICE.  The registered office of the corporation shall 
be in the City of Wilmington, County of New Castle, State of Delaware.

     2.   OTHER OFFICES.  The corporation may also have offices at such other 
places, both within or without the State of Delaware, as the Board of 
Directors may from time to time determine or the business of the corporation 
may require.

                             MEETINGS OF STOCKHOLDERS

     3.   TIME AND PLACE OF MEETINGS.  All meetings of the stockholders shall 
be held at such time and place, either within or without the State of 
Delaware, as shall be fixed by the Board of Directors and stated in the 
notice or waiver of notice of the meeting.

     4.   ANNUAL MEETING.  An annual meeting of the stockholders for the 
election of directors and for the transaction of such other business as may 
properly come before the meeting, shall be held on such date and at such time 
and place as the Board of Directors shall each year designate.

     5.   SPECIAL MEETINGS.  Special meetings of the stockholders, for any 
purpose or purposes prescribed in the notice of meeting, may be called only 
by the Board of Directors,


                                      1
<PAGE>

the Chairman of the Board or the President of the corporation.

     6.   NO ACTION WITHOUT MEETING.  Except as otherwise provided in the 
Certificate of Incorporation, at any time when the corporation has more than 
one stockholder of any class of capital stock, no action required to be taken 
or which may be taken at any annual or special meeting of the stockholders of 
such class of capital stock of the corporation may be taken without a 
meeting, and the power of stockholders to consent in writing, without a 
meeting, to the taking of any action is specifically denied.  Notwithstanding 
the foregoing, the holder or holders of the Class B Common Stock may take any 
action permitted to be taken by such holders as a class by written consent 
without a meeting.

     7.   NOTICE.

          (a)  Written notice of the place, date, and time of all meetings of 
the stockholders shall be given, not less than ten nor more than sixty days 
before the date on which the meeting is to be held, to each stockholder 
entitled to vote at such meeting, except as otherwise provided herein or 
required by law (meaning, here and hereinafter, as required from time to time 
by the Delaware General Corporation Law or the Certificate of Incorporation 
of the corporation).

          (b)  When a meeting is adjourned to another place, date or time, 
written notice need not be given of the adjourned meeting if the place, date 
and time thereof are announced at the meeting at which the adjournment is 
taken and the adjournment is


                                      2
<PAGE>

not for more than thirty days; provided however, that if the date of any 
adjourned meeting is more than thirty days after the date for which the 
meeting was originally noticed, or if a new record date is fixed for the 
adjourned meeting, written notice of the place, date, and time of the 
adjourned meeting shall be given in conformity herewith.  At any adjourned 
meeting, any business may be transacted which might have been transacted at 
the original meeting.

     8.   NOMINATIONS AND PROPOSALS.

          (a)  The Board of Directors of the corporation may nominate 
candidates for election as directors of the corporation and may propose such 
other matters for approval of the stockholders as the board deems necessary 
or appropriate.

          (b)  Any stockholder entitled to vote for directors may nominate 
candidates for election as directors of the corporation; provided, however, 
that so long as the corporation has more than one stockholder, no nominations 
for director of the corporation by any person other than the Board of 
Directors shall be presented to any meeting of stockholders unless the person 
making the nomination is a record stockholder and shall have delivered a 
written notice to the Secretary of the corporation no later than the close of 
business 60 days in advance of the stockholder meeting or ten days after the 
date on which notice of the meeting is first given to the stockholders, 
whichever is later.  Such notice shall (i) set forth the name and address of 
the person advancing such nomination and the nominee, together with such


                                      3
<PAGE>

information concerning the person making the nomination and the nominee as 
would be required by the appropriate Rules and Regulations of the Securities 
and Exchange Commission to be included in a proxy statement soliciting 
proxies for the election of such nominee, and (ii) shall include the duly 
executed written consent of such nominee to serve as director if elected.

          (c)  No proposal by any person other than the Board of Directors 
shall be submitted for the approval of the stockholders at any regular or 
special meeting of the stockholders of the corporation unless the person 
advancing such proposal shall have delivered a written notice to the 
Secretary of the corporation no later than the close of business 60 days in 
advance of the stockholder meeting or ten days after the date on which notice 
of the meeting is first given to the stockholders, whichever is later. Such 
notice shall set forth the name and address of the person advancing the 
proposal, any material interest of such person in the proposal, and such 
other information concerning the person making such proposal and the proposal 
itself as would be required by the appropriate Rules and Regulations of the 
Securities and Exchange Commission to be included in a proxy statement 
soliciting proxies for the proposal.

     9.   QUORUM AND REQUIRED VOTE.

          (a)  At any meeting of the stockholders, the holders of a majority 
of all of the shares of the stock entitled to vote on the subject matter at 
the meeting, present in person or by proxy, shall constitute a quorum, unless 
or except to the extent that


                                      4
<PAGE>

the presence of a larger number may be required by law.  Except as otherwise 
provided in these bylaws or as otherwise required by law, the affirmative 
vote of a majority of shares present in person or represented by proxy at the 
meeting and entitled to vote on the subject matter shall be the act of the 
stockholders.

          (b) If a quorum shall fail to attend any meeting, the chairman of 
the meeting or the holders of a majority of the shares of stock entitled to 
vote who are present, in person or by proxy, may adjourn the meeting to 
another place, date, or time. 

          (c) If a notice of any adjourned special meeting of stockholders is 
sent to all stockholders entitled to vote thereat, stating that it will be 
held with those present constituting a quorum, then except as otherwise 
provided in these bylaws or as otherwise required by law, those present at 
such adjourned meeting shall constitute a quorum, and all matters shall be 
determined by a majority of the votes cast at such meeting.

     10.  ORGANIZATION.  The Chairman of the Board or, in his or her absence, 
the President of the Corporation or, in the absence of both, such person as 
may be designated by the Board of Directors or, if there is no such 
designation, such person as may be chosen by the holders of a majority of the 
shares entitled to vote who are present, in person or by proxy, shall call to 
order any meeting of the stockholders and act as chairman of the meeting.

     11.  CONDUCT OF BUSINESS.  The chairman of any meeting of


                                      5
<PAGE>

stockholders shall determine the order of business and the procedure at the 
meeting, including such regulation of the manner of voting and the conduct of 
discussion as seem to him or her in order.

     12.  PROXIES AND VOTING.  At any meeting of the stockholders, every 
stockholder entitled to vote may vote in person or by proxy authorized by an 
instrument in writing filed in accordance with the procedures established for 
the meeting.

     13.  STOCK LIST.  A complete list of stockholders entitled to vote at 
any meeting of stockholders, arranged in alphabetical order and showing the 
address of each such stockholder and the number of shares of each class 
registered in his or her name, shall be open to the examination of any 
stockholder, for any purpose germane to the meeting, during ordinary business 
hours for a period of at least ten days prior to the meeting, either at a 
place within the city where the meeting is to be held, which place shall be 
specified in the notice of the meeting, or if not so specified, at the place 
where the meeting is to be held. The stock list shall also be kept at the 
place of the meeting during the whole time thereof and shall be open to the 
examination of any such stockholder present.


                              BOARD OF DIRECTORS

     14.  POWERS.  The business and affairs of the corporation shall be 
managed by or under the direction of its Board of Directors.


                                      6
<PAGE>

     15.  NUMBER, CLASSIFICATION AND TERM OF OFFICE. The number of directors 
of the corporation who shall constitute the whole board shall be five but may 
be increased or decreased from time to time either by a resolution or bylaw 
duly adopted by the Board of Directors.  The Board of Directors shall be and 
is divided into three classes: Class I, Class II and Class III, which shall 
be as nearly equal in number as possible.  Each director shall serve for a 
term ending on the date of the third annual meeting of stockholders following 
the annual meeting at which the director was elected; provided, however, that 
each initial director in Class I shall hold office until the annual meeting 
of stockholders in 1994; each initial director in Class II shall hold office 
until the annual meeting of stockholders in 1995; and each initial director 
in Class III shall hold office until the annual meeting of stockholders in 
1996.  Notwithstanding the foregoing, each director shall serve until his 
successor is duly elected and qualified or until his death, resignation or 
removal.

     16.  REMOVAL.  During any period when the Board of Directors is divided 
into classes, any director may be removed from office only with cause, and 
then only by the holders of a majority of the shares entitled to vote in an 
election of directors.

     17.  RESIGNATIONS.  A director may resign at any time by giving written 
notice to the corporation.  Such resignation shall be effective when given 
unless the director specifies a later time.  The resignation shall be 
effective regardless of whether it is accepted by the corporation.


                                      7
<PAGE>

     18.  NEWLY-CREATED DIRECTORSHIPS AND VACANCIES.  During any period when 
the Board of Directors is divided into classes, in the event of any increase 
or decrease in the authorized number of directors, any newly-created or 
eliminated directorships resulting from such increase or decrease shall be 
apportioned by the Board of Directors among the three classes of directors so 
as to maintain such classes as nearly equal in number as possible. Whether or 
not the board is classified, no decrease in the number of directors 
constituting the Board of Directors shall shorten the term of any incumbent 
director. Except as otherwise provided in the corporation's Certificate of 
Incorporation, newly-created directorships resulting from any increase in the 
number of directors and any vacancies on the Board of Directors resulting 
from death, resignation, disqualification, removal or other cause shall be 
filled by the affirmative vote of a majority of the remaining directors then 
in office (and not by stockholders), even though less than a quorum of the 
Board of Directors.  Any director elected in accordance with the preceding 
sentence shall hold office for the remainder of the full term of the class of 
directors in which the directorship was created or the vacancy occurred and 
until such director's successor shall have been elected and qualified.

     19.  REGULAR MEETINGS.  Regular meetings of the Board of Directors shall 
be held at such place or places, on such date or dates, and at such time or 
times as shall have been established by the Board of Directors and publicized 
among all directors.  A


                                      8
<PAGE>

notice of each regular meeting shall not be required.

     20.  SPECIAL MEETINGS.  Special meetings of the Board of Directors may 
be called by the Chairman of the Board, the President or any two directors.

     21.  NOTICE OF MEETINGS.

          (a)  Special meetings and regular meetings not fixed as provided in 
these Bylaws, shall be held upon four days' notice by mail or two days' 
notice delivered personally or by telephone or telegraph to each director who 
does not waive such notice.  The notice shall state the place, date and time 
of the meeting. Unless otherwise indicated in the notice, any and all 
business may be transacted at a special meeting.

          (b)  Notice of a reconvened meeting need not be given if the place, 
date and time of the reconvened meeting are announced at the meeting at which 
the adjournment is taken and the adjournment is not for more than 24 hours.  
If a meeting is adjourned for more than 24 hours, notice of the reconvened 
meeting shall be given prior to the time of that reconvened meeting to the 
directors who were not present at the time of adjournment.

     22.  ACTION WITHOUT MEETING.  Except as required by law, any action 
required or permitted to be taken at any meeting of the Board of Directors or 
any committee thereof may be taken without a meeting if all members of the 
Board of Directors or any committee thereof, as the case may be, consent 
thereto in writing and the writing or writings are filed with the minutes of 
the


                                      9
<PAGE>

Board of Directors or committee.

     23.  MEETING BY TELEPHONE.  Except as required by law, members of the 
Board of Directors, or of any committee thereof may participate in the 
meeting of the Board of Directors or committee by means of conference 
telephone or similar communications equipment if all persons who participate 
in the meeting can hear each other. Such participation shall constitute 
presence in person at such meeting.

     24.  QUORUM AND MANNER OF ACTING.  At any meeting of the Board of 
Directors, a majority of the directors then in office shall constitute a 
quorum for all purposes.  A meeting at which a quorum is initially present 
may continue to transact business notwithstanding the withdrawal of 
directors.  If a quorum shall fail to attend any meeting, a majority of those 
present may adjourn the meeting to another place, date, or time, without 
further notice or waiver thereof.  Except as provided herein, the act of the 
majority of the directors present at any meeting at which a quorum is present 
shall be the act of the Board of Directors.

     25.  COMMITTEES OF THE BOARD OF DIRECTORS.  The Board of Directors, by a 
vote of a majority of the whole Board, may from time to time designate 
committees of the Board, with such lawfully delegable powers and duties as it 
thereby confers, to serve at the pleasure of the Board and shall, for those 
committees and any others provided for herein, elect a director or directors 
to serve as the member or members, designating, if


                                      10
<PAGE>

it desires, other directors as alternate members who may replace any absent 
or disqualified member at any meeting of the committee. Any committee so 
designated may exercise the power and authority of the Board of Directors to 
declare a dividend or to authorize the issuance of stock if the resolution 
which designates the committee or a supplemental resolution of the Board of 
Directors shall so provide.  The principles set forth in Sections 14 through 
24 of these Bylaws shall apply to committees of the Board of Directors and to 
actions taken by such committees.

     26.  COMPENSATION OF DIRECTORS.  Unless otherwise restricted by the 
Certificate of Incorporation or these Bylaws the Board of Directors shall 
have the authority to fix the compensation of directors.  The directors may 
be paid their expenses, if any, of attendance at each meeting of the Board of 
Directors or a committee thereof and may receive fixed fees and other 
compensation for their services as directors.  No such payment shall preclude 
any director from serving the corporation in any other capacity and receiving 
compensation for such service.

                                   OFFICERS

     27.  TITLES.  The officers of the corporation shall be chosen by the 
Board of Directors and shall include a Chairman of the Board or a President 
or both and a Secretary.  The Board of Directors may also appoint a Treasurer 
and one or more Vice Presidents, Assistant Secretaries, Assistant Treasurers 
or other


                                      11
<PAGE>

officers.  Any number of offices may be held by the same person. All officers 
shall perform their duties and exercise their powers subject to the Board of 
Directors.

     28.  ELECTION, TERM OF OFFICE AND VACANCIES. The officers shall be 
elected annually by the Board of Directors at its regular meeting following 
the annual meeting of the stockholders and each officer shall hold office 
until the next annual election of officers and until the officer's successor 
is elected and qualified or until the officers death, resignation or removal. 
Any officer may be removed at any time, with or without cause, by the Board 
of Directors.  Any vacancy occurring in any office may be filled by the Board 
of Directors.

     29.  RESIGNATION.  Any officer may resign at any time upon notice to the 
corporation without prejudice to the rights, if any, of the corporation under 
any contract to which the officer is a party.  The resignation of an officer 
shall be effective when given unless the officer specifies a later time.  The 
resignation shall be effective regardless of whether it is accepted by the 
corporation.

     30.  CHIEF EXECUTIVE OFFICER.  The Board of Directors shall designate 
either the Chairman of the Board or the President as the chief executive 
officer and may prescribe the duties and powers of the chief executive 
officer.  In the absence of such a designation, the Chairman of the Board 
shall be the chief executive officer. If there is no Chairman of the Board, 
the President shall be the chief executive officer.  Subject to the


                                      12
<PAGE>

provisions of these Bylaws and to the direction of the Board of Directors, the
chief executive officer shall have the responsibility for the general management
and control of the business and affairs of the corporation and shall perform all
duties and have all powers which are commonly incident to the office of chief
executive or which are delegated to him or her by the Board of Directors. 
Either the Chairman of the Board or the President and such other officers as
may, from time to time be expressly designated by the Board of Directors shall
have the power to sign all stock certificates, contracts and other instruments
of the Corporation which are authorized.

     31.  SECRETARY AND ASSISTANT SECRETARIES.  The Secretary shall issue all 
authorized notices for and shall keep minutes of all meetings of the 
stockholders and the Board of Directors.  He or she shall have charge of the 
corporate books and shall perform such other duties as the Board of Directors 
may from time to time prescribe. At the request of the Secretary, or in the 
Secretary's absence or disability, any Assistant Secretary shall perform any 
of the duties of the Secretary and when so acting shall have all the powers 
of and be subject to all the restrictions upon, the Secretary.

     32.  OTHER OFFICERS.  The other officers of the corporation, if any, 
shall exercise such powers and perform such duties as the Board of Directors 
or the chief executive officer shall prescribe.

     33.  COMPENSATION.  The Board of Directors shall fix the


                                      13
<PAGE>

compensation of the chief executive officer and may fix the compensation of 
other employees of the corporation, including the other officers.  If the 
Board does not fix the compensation of the other officers, the chief 
executive officer shall fix such compensation.

     34.  ACTIONS WITH RESPECT TO SECURITIES OF OTHER CORPORATIONS.  Unless 
otherwise directed by the Board of Directors, the Chairman of the Board, the 
president or any officer of the corporation authorized by the Chairman of the 
Board or the president, shall have power to vote and otherwise act on behalf 
of the corporation, in person or by proxy, at any meeting of stockholders of, 
or with respect to any action of stockholders of, any other corporation in 
which the corporation may hold securities and otherwise shall have power to 
exercise any and all rights and powers which the corporation may possess by 
reason of its ownership of securities in such other corporation.

                              STOCK AND DIVIDENDS

     35.  CERTIFICATES OF STOCK.  Each stockholder shall be entitled to a 
certificate signed by, or in the name of, the corporation by the Chairman, 
the President or a Vice President, and by the Secretary or an Assistant 
Secretary, or a Treasurer or an Assistant Treasurer, certifying the number of 
shares owned by him or her.  Any or all of the signatures on the certificate 
may be facsimile.


                                      14
<PAGE>

     36.  TRANSFERS OF STOCK.  Transfers of stock shall be made only upon the 
transfer books of the corporation kept at an office of the corporation or by 
transfer agents designated to transfer shares of the stock of the 
corporation. Except where a certificate is issued in accordance with the next 
sentence of this Section, an outstanding certificate for the number of shares 
involved shall be surrendered for cancellation before a new certificate is 
issued therefor.  In the event of the loss, theft or destruction of any 
certificate of stock, another may be issued in its place pursuant to such 
regulations as the Board of Directors may establish concerning proof of such 
loss, theft or destruction and concerning the giving of a satisfactory bond 
or bonds of indemnity.

     37.  REGULATIONS.  The issue, transfer, conversion and registration of 
certificates of stock shall be governed by such other regulations as the 
Board of Directors may establish.

                                  RECORD DATE

     38.  RECORD DATE.  In order that the corporation may determine the 
stockholders entitled to notice of or to vote at any meeting of stockholders 
or any adjournment thereof, or entitled to receive payment of any dividend or 
other distribution or allotment of any rights, or entitled to exercise any 
rights in respect of any change, conversion or exchange of stock or for the 
purpose of any other lawful action, the Board of Directors may fix in advance 
a record date, which shall not be more than 60 nor


                                      15
<PAGE>

less than ten days before the date of such meeting, nor more than 60 days 
prior to any other action.  If no record date is fixed, the record date (1) 
for determining stockholders entitled to notice of or to vote at a meeting of 
stockholders shall be at the close of business on the day next preceding the 
day on which notice is given or, if notice is waived, at the close of 
business on the day next preceding the day on which the meeting is held; and 
(2) for determining stockholders for any other purpose shall be at the close 
of business on the day on which the Board of Directors adopts the resolution 
relating thereto.  A determination of stockholders of record entitled to 
notice of or to vote at a meeting of stockholders shall apply to any 
adjournment of the meeting; provided, however, that the Board of Directors 
may fix a new record date for the reconvened meeting.

                                 WAIVER OF NOTICE

     39.  WAIVER OF NOTICE.  Whenever notice is required to be given by law 
or these Bylaws, a written waiver of notice, signed by the person entitled to 
notice, whether before or after the time stated therein, shall be deemed 
equivalent to notice.  Attendance of a person at a meeting shall constitute a 
waiver of notice of such meeting, except when the person attends a meeting 
for the express purpose of objecting, at the beginning of the meeting, to the 
transaction of any business because the meeting is not lawfully called or 
convened.  Unless so required by the Certificate of Incorporation or these 
Bylaws, neither the


                                      16
<PAGE>

business to be transacted at, nor the purpose of any regular or special 
meeting of the stockholders, directors or members of a committee of directors 
need be specified in any written waiver of notice.

                                   AMENDMENTS

     40.  AMENDMENTS.  These Bylaws may be amended or repealed or new bylaws 
may be adopted by the stockholders or by the Board of Directors.

                                  MISCELLANEOUS

     41.  FISCAL YEAR.  The fiscal year of the corporation shall be as fixed 
by the Board of Directors.

     42.  TIME PERIODS.  In applying any provision of these Bylaws which 
requires that an act be done or not done within a specified number of days 
prior to an event, calendar days shall be used, the day of doing of the act 
shall be excluded, and the day of the event shall be included.

     43.  FACSIMILE SIGNATURES.  In addition, to the provisions for use of 
facsimile signature elsewhere specifically authorized in these Bylaws, 
facsimile signatures of any officer or officers of the corporation may be 
used whenever and as authorized by the Board of Directors.

     44.  CORPORATE SEAL. The Board of Directors may provide a suitable seal, 
containing the name of the corporation, which seal shall be in the charge of 
the Secretary.  Duplicates of the seal


                                      17
<PAGE>

may be kept and used by a Treasurer or by an Assistant Secretary or Assistant 
Treasurer.

     45.  RELIANCE UPON BOOKS, REPORTS AND RECORDS.  Each director, each 
member of any committee designated by the Board of Directors, and each 
officer of the corporation shall, in the performance of his or her duties, be 
fully protected in relying in good faith upon the books of account or other 
records of the corporation, including reports made to the corporation by any 
of its officers, by an independent certified public accountant or by an 
appraiser.





     This is to certify that these Bylaws were duly adopted by the Board of 
Directors of this corporation on January 26, 1994.







                                                   /s/ David R. Hoffmann
                                                   ----------------------
                                                   DAVID R. HOFFMANN
                                                   Secretary








                                      18


<PAGE>

                          TECHNOLOGY LICENSE AGREEMENT
                          ----------------------------

     This Technology License Agreement (this "Agreement") is made as of the 10th
day of March, 1993 between ALZA Corporation, a Delaware corporation ("ALZA") and
Therapeutic Discovery Corporation, a Delaware corporation ("TDC").

                                R E C I T A L S
                                - - - - - - - -

     A.   ALZA has proprietary rights to drug delivery technology.

     B.   TDC proposes to undertake the development of one or more products 
using Alza Proprietary Rights and expects to develop or acquire certain 
technology in connection therewith.

     C.   As of the date hereof, ALZA and TDC are entering into a Development 
Agreement.

     D.   ALZA is willing to grant to TDC a license to practice Alza 
Proprietary Rights solely for the purpose of developing and commercializing 
Products under the circumstances hereinafter set forth.

     NOW THEREFORE, THE PARTIES HEREBY AGREE AS FOLLOWS: 

     1.   DEFINITIONS.

          For the purposes of this Agreement, the following terms shall have 
the respective meanings set forth below:

          1.1  "Affiliate" shall mean a corporation or any other entity that 
directly, or indirectly through one or more intermediaries, controls, is 
controlled by, or is under common control with, the designated party.  
"Control" shall mean ownership of at least 50% of the shares of stock 
entitled to vote


                                      -1-
<PAGE>

for the election of directors in the case of a corporation, and at least 50% 
of the interests in profits in the case of a business entity other than a 
corporation.

          1.2  "ALZA Proprietary Rights" shall mean all Proprietary Rights of
ALZA (including the Developed Technology) to the extent they are owned and
controlled by ALZA now or during the term of the Development Contract.

          1.3  "Developed Technology" shall mean Proprietary Rights that (i) are
generated, developed, conceived or first reduced to practice, as the case may
be, by ALZA or others than ALZA under a Product Development Program undertaken
pursuant to the Development Contract or (ii) are acquired by or otherwise
obtained on behalf of TDC during the term of the Development Contract from
persons other than ALZA and necessary or useful to the development or
commercialization of Products.

          1.4  "Development Contract" shall mean the Development Agreement 
dated as of the date hereof between ALZA and TDC.

          1.5  "Infringing Product" shall mean any product sold by a third 
party which infringes or is alleged to infringe any patent or patents 
licensed to TDC hereunder.

          1.6  "License Option Agreement" shall mean the License Option 
Agreement dated the date hereof between ALZA and TDC.

          1.7  "Pre-Existing Rights" shall mean the rights of Ciba-Geigy 
Limited or one of its Affiliates under those certain agreements dated May 2, 
1982 between ALZA and Ciba-Geigy Limited or one of its Affiliates.


                                      -2-
<PAGE>

          1.8  "Product" shall mean a product accepted for development under 
the Development Contract.  Confirmation of the list of Products shall be made 
at any time by either party upon the reasonable request of the other.

          1.9  "Proprietary Rights" shall mean data, inventions, information, 
processes, know-how and trade secrets, and patents or patent applications for 
any of the foregoing, owned or licensed to a person and which such person has 
the right to license.  Proprietary Rights shall not include trademarks.

          1.10 "Purchase Option" shall mean that certain option to purchase 
all of the outstanding shares of TDC Class A Common Stock that is granted to 
ALZA pursuant to TDC's Certificate of Incorporation, as amended.

     2.   LICENSE TO ALZA TECHNOLOGY.

          2.1  GRANT OF LICENSE.  ALZA hereby grants to TDC, on the terms and 
conditions of this Agreement, a worldwide, exclusive license (subject to the 
Pre-Existing Rights), in perpetuity, with the right to sublicense (as set 
forth below), to practice ALZA Proprietary Rights to develop and 
commercialize Products, but for no other purpose whatsoever. TDC shall not 
sublicense any ALZA Proprietary Rights to, or enter into other arrangements 
with respect to any ALZA Proprietary Rights with, any third party for any 
purpose, except as set forth in Sections 2.2 and 2.3.

          2.2  Permitted Sublicenses.

               (a)  Except as set forth in clause (b) below, TDC may grant 
sublicenses to ALZA and third parties to practice ALZA


                                      -3-
<PAGE>

Proprietary Rights solely for the purpose of conducting activities in 
connection with the development of Products; provided that during the term of 
the Development Contract, any such sublicenses shall be in accordance with 
the terms of the Development Contract.

               (b)  If ALZA shall fail to exercise its License Option with 
respect to any Product in one or more countries, from and after termination 
of such License Option in any such country, TDC may sublicense ALZA 
Proprietary Rights in or solely to the extent necessary to complete the 
development of, or to make, use or sell such Product in such country, to a 
third party or third parties for the sole purpose of commercializing such 
Product in such country.

          2.3  CONDITIONS OF SUBLICENSES.  Each sublicensee shall sign such 
agreements as ALZA reasonably deems appropriate to protect ALZA Proprietary 
Rights and to protect ALZA's rights under all agreements between ALZA and TDC 
and under the Purchase Option.  Each sublicensee shall have all the duties of 
TDC hereunder with respect to such sublicense, and each sublicensee shall 
acknowledge these duties to ALZA in writing.  No sublicense shall have the 
effect of relieving TDC of any of its obligations hereunder.

          2.4  PRIOR AND FUTURE GRANTS.  TDC understands and acknowledges 
that ALZA is in the business of developing products incorporating ALZA 
Proprietary Rights for its own account or under arrangements with third 
parties, and that as a result, the license granted hereunder is limited 
strictly to the development and


                                      -4-
<PAGE>

commercialization of Products, and ALZA may grant third party licenses to 
ALZA Proprietary Rights for other purposes.

     3.   EFFORTS OF TDC.

          3.1  DILIGENCE.  TDC promptly shall commence and shall use diligent 
efforts to develop Products under the Development Contract.

     4.   PATENTS.

          4.1  NOTIFICATION OF INFRINGEMENT.  TDC shall notify ALZA of any 
infringement or alleged infringement known to TDC of any patent covering ALZA 
Proprietary Rights or of any unauthorized or alleged unauthorized use known 
to TDC of any ALZA Proprietary Rights by the manufacture, use or sale by a 
third party of any Infringing Product. In the event of any such alleged 
infringement or unauthorized use, ALZA shall have the right, at its own 
expense and with the right to all recoveries, to take appropriate action to 
restrain such alleged infringement or unauthorized use.  If ALZA takes such 
action, TDC shall cooperate fully with ALZA in its pursuit thereof, at ALZA's 
expense, to the extent reasonably requested by ALZA.  If (a) the Infringing 
Product is substantially similar to a Product (in that the Infringing Product 
incorporates the same drug compound or compounds as its active agent or 
agents as such Product and a substantially similar delivery system) for which 
ALZA's License Option has expired unexercised, and (b) within six months 
after written notice from TDC, ALZA has not commenced any action to restrain 
such alleged infringement or unauthorized use, and (c) if, at such time, the 
annualized unit sales volume of such Infringing Product in a country equals 
or exceeds 25% of the unit sales volume of the related Product in such 
country, then TDC shall have the right, at its own expense and


                                      -5-
<PAGE>

with the right to all recoveries, to take such action as it deems appropriate 
to restrain such alleged infringement or unauthorized use.  If TDC takes any 
such action, ALZA shall cooperate fully with TDC in its pursuit thereof, at 
TDC's expense, as may reasonably be requested by TDC. TDC shall not settle 
any such action relating to any alleged infringement or unauthorized use 
which in any manner would affect ALZA Proprietary Rights without the prior 
written consent of ALZA.

     5.   CONFIDENTIALITY OF INFORMATION.

          5.1  CONFIDENTIALITY.  During the term of this Agreement and for a 
period of 10 years following its termination, TDC shall maintain in 
confidence all ALZA Proprietary Rights; provided, however, that nothing 
contained herein shall prevent TDC from disclosing any ALZA Proprietary 
Rights to the extent such ALZA Proprietary Rights (a) are required to be 
disclosed in connection with securing necessary governmental approvals for 
the marketing of Products, or to make, use or sell Products, (b) are required 
to be disclosed for the purpose of complying with governmental regulations, 
(c) are disclosed in connection with any sublicense permitted hereunder, (d) 
are known to or used by TDC prior to the date hereof as evidenced by TDC's 
written records, (e) are lawfully disclosed to TDC by a third party having 
the right to disclose such information to TDC, or (f) either before or after 
the time of disclosure to TDC, become known to the public other than by an 
unauthorized act or omission of TDC or any of TDC's employees or agents. Any 
disclosure of ALZA Proprietary Rights to third parties shall be made subject 
to similar obligations of confidentiality on the part of such third parties.  
The obligations pursuant to this Section 5 shall survive the termination of 
this


                                      -6-
<PAGE>

Agreement for any reason.  Any breach of this Section 5.1 shall result in 
irreparable harm, and in the event of a breach, the aggrieved party shall be 
entitled to injunctive relief (without the need to post a bond) in addition 
to any other remedies available at law or in equity.

     6.   DISCLAIMERS.

          6.1  DISCLAIMER CONCERNING ALZA PROPRIETARY RIGHTS. ALZA DISCLAIMS ANY
EXPRESS OR IMPLIED WARRANTY (i) THAT ANY ALZA PROPRIETARY RIGHTS, OR THE USE
THEREOF, OR ANY PRODUCT CANDIDATES OR PRODUCTS INCORPORATING OR MANUFACTURED BY
THE USE THEREOF, WILL BE FREE FROM CLAIMS OF PATENT INFRINGEMENT, INTERFERENCE
OR UNLAWFUL USE OF PROPRIETARY INFORMATION OF ANY THIRD PARTY OR (ii) OF THE
ACCURACY, RELIABILITY, TECHNOLOGICAL OR COMMERCIAL VALUE, COMPREHENSIVENESS OR
MERCHANTABILITY OF THE ALZA PROPRIETARY RIGHTS OR THEIR SUITABILITY OR FITNESS
FOR ANY PURPOSE WHATSOEVER, INCLUDING, WITHOUT LIMITATION, THE DESIGN,
DEVELOPMENT, MANUFACTURE, USE OR SALE OF PRODUCTS.  ALZA DISCLAIMS ALL OTHER
WARRANTIES OF WHATEVER NATURE, EXPRESS OR IMPLIED.

     7.   REPORTS OF ADVERSE REACTION.

          7.1  REPORTS.  During the term of this Agreement, each party shall 
promptly inform the other party of any information that it obtains or 
develops regarding the efficacy or safety of a Product and shall promptly 
report to the other party any information or notice of adverse or unexpected 
reactions or side effects related to the utilization or medical 
administration of a Product. Further, during the term of this Agreement, each 
party shall promptly inform the other of any information that it obtains or 
develops regarding the safety of any ALZA Proprietary Rights as related to 
the Products and shall promptly report to the other party any information or 
notice of


                                      -7-
<PAGE>

adverse or unexpected reactions or side effects related to the utilization or 
medical administration of Product incorporating ALZA Proprietary Rights.  
Each party shall allow the other to comply with the adverse reaction 
reporting requirements of the Food, Drug and Cosmetic Act, 21 USC 321 et 
seq., and regulations thereunder with respect to the Products by notifying 
the other party in writing of any "adverse drug experience" that is 
considered "serious" or "unexpected" regardless of source, in a manner so 
that the other party shall receive such notice within three working days of 
the notifying party's first having "obtained or otherwise received" such 
"adverse drug experience...from any source" as those terms are defined in 21 
CFR 314.80. Each party shall provide the other party with copies of Adverse 
Drug Experience Reports filed with the FDA as to the Products. The 
obligations under this 7.1 shall be subject to legal and contractual 
obligations prohibiting the disclosure of such information. TDC agrees and 
acknowledges that ALZA may provide information it obtains under this Section 
7.1 to ALZA's other clients developing and/or marketing products 
incorporating the same delivery systems as are incorporated in the Products.

     8.   TERMINATION.

          8.1  TERMINATION FOR BREACH.  Either party may terminate this 
Agreement effective upon the giving of written notice of such termination to 
the other party in the event such other party:

               (a)  breaches any of its material obligations hereunder or 
under the License Option Agreement and such breach continues for a period of 
60 days after written notice thereof by the other party; and

                                      -8-
<PAGE>

               (b)  enters into any proceeding, whether voluntary or 
otherwise, in bankruptcy, reorganization, arrangement for the appointment of 
a receiver or trustee to take possession of such other party's assets or any 
other proceeding under any law for the relief of creditors, or makes an 
assignment for the benefit of such other party's creditors. 

     This Agreement shall automatically terminate upon termination by TDC of 
the Development Contract other than due to a breach by ALZA, or upon 
termination by ALZA of the Development Contract due to a breach by TDC.

     9.   FORCE MAJEURE.

          9.1  FORCE MAJEURE.  Neither party to this Agreement shall be 
liable for failure or delay in the performance of any of its obligations 
hereunder, if such failure or delay is due to causes beyond its reasonable 
control, including, without limitation, acts of God, earthquakes, fires, 
strikes, acts of war, or intervention of any governmental authority, but any 
such delay or failure shall be remedied by such party as soon as possible 
after the removal of the cause of such failure or delay.

     10.  INDEMNIFICATION.

          10.1 INDEMNITY.  TDC shall indemnify, defend and hold ALZA harmless 
from and against any and all liabilities, claims, demands, damages, costs, 
expenses or money judgments incurred by or rendered against ALZA and its 
Affiliates, which arise out of the use, design, labeling or manufacture, 
processing, packaging, sale or commercialization of the Products by TDC, its 
Affiliates, subcontractors and sublicensees.  ALZA shall permit TDC's 
attorneys,


                                      -9-
<PAGE>

at TDC's discretion and cost, to handle and control the defense of any claims or
suits as to which ALZA may be entitled to indemnity hereunder, and ALZA agrees
not to settle any such claims or suits without the prior written consent of TDC.

          10.2 NOTICE.  ALZA shall give TDC prompt notice in writing, in the 
manner set forth in Section 11.6 below, of any claim or demand made against 
ALZA for which ALZA may be entitled to indemnity under Section 10.1. ALZA 
shall have the right to participate, at its own expense, in the defense of 
any such claim or demand to the extent it so desires.

     11.  MISCELLANEOUS.

          11.1 AMENDMENT.  Any waiver by either party hereto of a breach of 
any provisions of this Agreement shall not be implied and shall not be valid 
unless such waiver is recited in writing and signed by such party.  Failure 
of any party to require, in one or more instances, performance by the other 
party in strict accordance with the terms and conditions of this Agreement 
shall not be deemed a waiver or relinquishment of the future performance of 
any such terms or conditions or of any other terms and conditions of this 
Agreement.  A waiver by either party of any term or condition of this 
Agreement shall not be deemed or construed to be a waiver of such term or 
condition for any other term.  All rights, remedies, undertakings, 
obligations and agreements contained in this Agreement shall be cumulative 
and none of them shall be a limitation of any other remedy, right, 
undertaking, obligation or agreement of either party.  This Agreement may not 
be amended except in a writing signed by both parties.


                                      -10-
<PAGE>

          11.2 ASSIGNMENT. Neither party may assign its rights and 
obligations hereunder without the prior written consent of the other party, 
which consent may not be unreasonably withheld; provided, however, that ALZA 
may assign such rights and obligations hereunder to any person or entity with 
which ALZA is merged or consolidated or which purchases all or substantially 
all of the assets of ALZA.

          11.3 ARBITRATION.

               11.3.1 ARBITRATION.  All disputes which may arise under, out 
of or in connection with this Agreement shall be settled by arbitration 
conducted in the City of San Francisco, State of California, in accordance 
with the then existing rules of the American Arbitration Association, and 
judgment upon the award rendered by the arbitrators may be entered in any 
court having jurisdiction thereof.  The parties hereby agree that service of 
any notices in the course of such arbitration at their respective addresses 
as provided for in Section 11.7 of this Agreement shall be valid and 
sufficient.

               11.3.2 ARBITRATORS. In any arbitration pursuant to this 
Section 11.3, the award shall be rendered by a majority of the members of a 
board of arbitration consisting of three members who shall be appointed by 
the parties jointly, or if the parties cannot agree as to three arbitrators 
within 30 days after the commencement of the arbitration proceeding, then one 
arbitrator shall be appointed by ALZA and one arbitrator shall be appointed 
by TDC within 60 days after the commencement of the arbitration proceeding.  
The third arbitrator shall be appointed by mutual agreement of such two 
arbitrators.  In the event of failure of the two arbitrators to agree within 
75 days after commencement of the arbitration proceeding upon the appointment


                                      -11-
<PAGE>

of the third arbitrator, the third arbitrator shall be appointed by the 
American Arbitration Association in accordance with its then existing rules. 
Notwithstanding the foregoing, in the event that any party shall fail to 
appoint an arbitrator it is required to appoint within the specified time 
period, such arbitrator and the third arbitrator shall be appointed by the 
American Arbitration Association in accordance with its then existing rules. 
For purposes of this Section 11.3, the "commencement of the arbitration 
proceeding" shall be deemed to be the date upon which a written demand for 
arbitration is received by the American Arbitration Association from one of 
the parties.

          11.4 COUNTERPARTS.  This Agreement may be executed in any number of 
counterparts each of which when so executed shall be deemed to be an original 
and all of which when taken together shall constitute this Agreement.

          11.5 GOVERNING LAW.  This Agreement shall be governed by the laws 
of the state of California as applied to residents of that state entering 
into contracts to be performed in that state.

          11.6 HEADINGS.  The headings set forth at the beginning of the 
various sections of this Agreement are for reference and convenience and 
shall not affect the meanings of the provisions of this Agreement.

          11.7 NOTICES.  Notices required under this Agreement shall be in 
writing and sent by registered or certified mail, postage prepaid, or by 
telex or facsimile and confirmed by registered or certified mail and 
addressed as follows:


                                      -12-
<PAGE>

          If to ALZA:             ALZA Corporation 
                                  950 Page Mill Road 
                                  P. 0. Box 10950 
                                  Palo Alto, CA 94303-0802
                                  Attention:  Vice President, Legal

          If to TDC:              Therapeutic Discovery Corporation 
                                  1290 Page Mill Road
                                  P.O. Box 10051
                                  Palo Alto, CA 94303-0860 
                                  Attention:  Chief Executive Officer

All notices shall be deemed to be effective five days after the date of 
mailing or upon receipt if sent by telex or facsimile (but only if followed 
by certified or registered confirmation).  Either party may change the 
address at which notice is to be received by written notice pursuant to this 
Section 11.7.

          11.8 PUBLIC DISCLOSURE.  Neither party shall disclose to third 
parties, nor originate any publicity, news release or public announcement, 
written or oral, whether to the public, the press, stockholders or otherwise, 
referring to the existence or terms of this Agreement, the subject matter to 
which it relates, the performance under it or any of its specific terms and 
conditions, except such announcements, as in the opinion of the counsel for 
the party making such announcement, are required by law, including United 
States securities laws, rules or regulations, without the prior written 
consent of the other party.  If a party decides to make an announcement it 
believes to be required by law with respect to this Agreement, it will give 
the other party such notice as is reasonably practicable and an opportunity 
to comment upon the announcement.

          11.9 SEVERABILITY.  If any provision of this Agreement is held by a 
court of competent jurisdiction to be invalid or unenforceable, it shall be 
modified, if possible, to the minimum


                                      -13-
<PAGE>

extent necessary to make it valid and enforceable or, if such modification is 
not possible, it shall be stricken and the remaining provisions shall remain 
in full force and effect; provided, however, that if a provision is stricken 
so as to significantly alter the economic arrangements of this Agreement, the 
party adversely affected may terminate this Agreement upon 60 days' prior 
written notice to the other party.

          11.10 RELATIONSHIP OF THE PARTIES.  For all purposes of this 
Agreement, TDC and ALZA shall be deemed to be independent contractors and 
anything in this Agreement to the contrary notwithstanding, nothing herein 
shall be deemed to constitute TDC and ALZA as partners, joint venturers, 
co-owners, an association or any entity separate and apart from each party 
itself, nor shall this Agreement constitute any party hereto an employee or 
agent, legal or otherwise, of the other party for any purposes whatsoever.  
Neither party hereto is authorized to make any statements or representations 
on behalf of the other party or in any way obligate the other party, except 
as expressly authorized in writing by the other party.  Anything in this 
Agreement to the contrary notwithstanding, no party hereto shall assume nor 
shall be liable for any liabilities or obligations of the other party, 
whether past, present or future.

          11.11 SURVIVAL.  The provisions of Sections 1, 2.3, 4, 5, 6, 7, l0, 
11.3, 11.5, 11.7, 11.8, 11.9, 11.10 and this Section 11.11 shall survive the 
termination for any reason of this Agreement.  Any payments due under this 
Agreement with respect to any period prior to its termination shall be made 
notwithstanding the termination of this Agreement.


                                      -14-
<PAGE>

     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be 
executed as of the date first written above by their duly authorized 
representatives.


                                  ALZA CORPORATION


                                  By: /s/ Jane E. Shaw
                                     -----------------------------------------
                                  Title: President and Chief Operating Officer
                                        --------------------------------------


                                  THERAPEUTIC DISCOVERY CORPORATION


                                  By: /s/ Pieter P. Bonsen
                                     -----------------------------------------
                                  Title: President
                                        --------------------------------------




                                      -15-

<PAGE>








                              DEVELOPMENT AGREEMENT
                                     BETWEEN
                                 ALZA CORPORATION
                                       AND
                         THERAPEUTIC DISCOVERY CORPORATION
                               DATED MARCH 10, 1993


<PAGE>

                                TABLE OF CONTENTS
                                -----------------

                                                              Page
                                                              ----

SECTION 1 DEFINITIONS . . . . . . . . . . . . . . . . . . . .   1

     1.1  "Affiliate" . . . . . . . . . . . . . . . . . . . .   1
     1.2  "ALZA Proprietary Rights" . . . . . . . . . . . . .   2
     1.3  "Available Funds  . . . . . . . . . . . . . . . . .   2
     1.4  "Developed Technology"  . . . . . . . . . . . . . .   2
     1.5  "Development Cost(s) "  . . . . . . . . . . . . . .   2
     1.6  "Distribution"  . . . . . . . . . . . . . . . . . .   2
     l.7  "Drug"  . . . . . . . . . . . . . . . . . . . . . .   3
     1 8  "FDA" . . . . . . . . . . . . . . . . . . . . . . .   3
     1.9  "License Option"  . . . . . . . . . . . . . . . . .   3
     1.10 "License Option Agreement"  . . . . . . . . . . . .   3
     1.11 "Major Market Country"  . . . . . . . . . . . . . .   3
     l 12 "Net Sales" . . . . . . . . . . . . . . . . . . . .   3
     1.13 "0ther Royalty-Bearing Product" . . . . . . . . . .   4
     1.14 "Product" . . . . . . . . . . . . . . . . . . . . .   4
     1.15 "Product Candidate" . . . . . . . . . . . . . . . .   4
     1.16 "Product Development Program" . . . . . . . . . . .   4
     1.17 "Proprietary Rights"  . . . . . . . . . . . . . . .   4
     1.18 "Purchase Option" . . . . . . . . . . . . . . . . .   4
     1.19 "Special Royalty Payments"  . . . . . . . . . . . .   5
     1.20 "Sublicensing Revenues" . . . . . . . . . . . . . .   5
     1.21 "System"  . . . . . . . . . . . . . . . . . . . . .   5
     1.22 "Technology License Agreement"  . . . . . . . . . .   6

SECTION 2 PRODUCT DEVELOPMENT PROGRAM . . . . . . . . . . . .   6

     2.1  Product Candidate Work Plans  . . . . . . . . . . .   6
     2.2  Product Selection . . . . . . . . . . . . . . . . .   6
     2.3  Product Development . . . . . . . . . . . . . . . .   7
     2.4  Later Requests  . . . . . . . . . . . . . . . . . .   8

SECTION 3 RESEARCH AND DEVELOPMENT PROGRAMS;
          ALZA SERVICES . . . . . . . . . . . . . . . . . . .   8

     3.1  Product Development - TDC Obligations . . . . . . .   8
     3.2  Product Development - ALZA Obligations;
            Other ALZA Activities . . . . . . . . . . . . . .   9
     3.3  Work Plans and Cost Estimates . . . . . . . . . . .   9
     3.4  Third Party Rights  . . . . . . . . . . . . . . . .  10
     3.5  Consultation  . . . . . . . . . . . . . . . . . . .  10
     3.6  No Use of Available Funds After License . . . . . .  10

SECTION 4 PAYMENT FOR SERVICES; TIMING OF PAYMENTS  . . . . .  11

     4.1  Payment of Development Costs  . . . . . . . . . . .  11
     4.2  Timing of Payments  . . . . . . . . . . . . . . . .  11
     4.3  Sufficiency of Funds  . . . . . . . . . . . . . . .  11

                                      -i-
<PAGE>

                               TABLE OF CONTENTS
                               -----------------
                                  (continued)

                                                              Page
                                                              ----

SECTION 5 REPORTS AND RECORDS  . . . . . . . . . . . . . . .   11

     5.1  Quarterly and Final Reports. . . . . . . . . . . .   11
     5.2  Available Funds Report . . . . . . . . . . . . . .   12
     5.3  Records  . . . . . . . . . . . . . . . . . . . . .   12

SECTION 6 LICENSE OF TECHNOLOGY FOR DEVELOPMENT  . . . . . .   12

     6.1  License to use ALZA Proprietary Rights . . . . . .   12
     6.2  Termination of License . . . . . . . . . . . . . .   13

SECTION 7 OWNERSHIP AND LICENSE OF DEVELOPED TECHNOLOGY;
          PATENTS  . . . . . . . . . . . . . . . . . . . . .   13

     7.1  ownership of Products. . . . . . . . . . . . . . .   13
     7.2  Ownership of Developed Technology  . . . . . . . .   13
     7.3  Patents Covering Developed Technology  . . . . . .   13
     7.4  Royalties on Other Royalty-Bearing Products  . . .   13
     7.5  Buyout of Other Royalty-Bearing Product
            Royalties  . . . . . . . . . . . . . . . . . . .   14
     7.6  Reports  . . . . . . . . . . . . . . . . . . . . .   15
     7.7  Review by Accountants  . . . . . . . . . . . . . .   15
     7.8  Payments   . . . . . . . . . . . . . . . . . . . .   16
     7.9  Late Payments  . . . . . . . . . . . . . . . . . .   17

SECTION 8 ACCESS TO INFORMATION  . . . . . . . . . . . . . .   17

     8.1  Access   . . . . . . . . . . . . . . . . . . . . .   17
     8.2  Third Parties  . . . . . . . . . . . . . . . . . .   17
     8.3  Confidentiality  . . . . . . . . . . . . . . . . .   17

SECTION 9 DISCLAIMERS  . . . . . . . . . . . . . . . . . . .   19

     9.1  Disclaimer   . . . . . . . . . . . . . . . . . . .   19

SECTION 10 COVENANTS . . . . . . . . . . . . . . . . . . . .   19

     10.1  Use of Available Funds  . . . . . . . . . . . . .   19
     10.2  Negative Pledge . . . . . . . . . . . . . . . . .   20
     10.3  Protection of Available Funds . . . . . . . . . .   20
     10.4  No Inconsistent Agreements .  . . . . . . . . . .   20

SECTION 11 TERM AND TERMINATION  . . . . . . . . . . . . . .   21

     11.1  Automatic Termination . . . . . . . . . . . . . .   21
     11.2  Other Termination . . . . . . . . . . . . . . . .   21

SECTION 12 FORCE MAJEURE . . . . . . . . . . . . . . . . . .   21

     12.1  Force Majeure . . . . . . . . . . . . . . . . . .   21


                                      -ii-
<PAGE>

                                TABLE OF CONTENTS
                                -----------------
                                   (continued)

                                                              Page
                                                              ----

SECTION 13 MISCELLANEOUS . . . . . . . . . . . . . . . . . .   22

     13.1  Amendment . . . . . . . . . . . . . . . . . . . .   22
     13.2  Assignment  . . . . . . . . . . . . . . . . . . .   22
     13.4  Counterparts  . . . . . . . . . . . . . . . . . .   24
     13.5  Governing Law   . . . . . . . . . . . . . . . . .   24
     13.6  Headings  . . . . . . . . . . . . . . . . . . . .   24
     13.7  Notices . . . . . . . . . . . . . . . . . . . . .   24
     13.8  Public Disclosure . . . . . . . . . . . . . . . .   25
     13.9  Severability  . . . . . . . . . . . . . . . . . .   25
     13.10 Relationship of the Parties . . . . . . . . . . .   26
     13.11 Survival  . . . . . . . . . . . . . . . . . . . .   26




                                     -iii-
<PAGE>

                             DEVELOPMENT AGREEMENT

     AGREEMENT made as of the 10th day of March, 1993 between ALZA 
Corporation, a Delaware corporation ("ALZA"), and Therapeutic Discovery 
Corporation, a Delaware corporation ("TDC").

                                 R E C I T A L S
                                 - - - - - - - -

     A.   TDC is a corporation organized for the purpose of developing and 
commercializing products utilizing ALZA Proprietary Rights (as defined below).

     B.   ALZA is engaged in the business of research and development of 
pharmaceutical products.

     C.   TDC desires to have ALZA perform, on behalf of TDC, research and 
development activities directed toward the development of Products (as 
defined below).

     NOW, THEREFORE, the parties agree as follows:

                                     SECTION 1
                                     ---------

                                    DEFINITIONS
                                    ------------

          1.1  "Affiliate" shall mean a corporation or any other entity that 
directly, or indirectly through one or more intermediaries, controls, is 
controlled by, or is under common control with, the designated party.  
"Control" shall mean ownership of at least 50% of the shares of stock 
entitled to vote for the election of directors in the case of a corporation, 
and at least 50% of the interests in profits in the case of a business entity 
other than a corporation.


<PAGE>

          1.2  "ALZA Proprietary Rights" shall mean all Proprietary Rights of 
ALZA (including the Developed Technology) to the extent they are owned and 
controlled by ALZA now or during the term of this Agreement.

          1.3  "Available Funds" shall mean the sum of (a) $250 million plus 
(b) interest and other income earned through temporary investment of such 
funds pending their application under this Agreement, minus the sum of (c) 
reasonable ongoing administrative expenses of TDC, including legal and 
administrative expenses and reasonable reserves for present and future 
obligations plus (d) the costs of the Distribution.

          1.4  "Developed Technology" shall mean Proprietary Rights that (a) 
are generated, developed, conceived or first reduced to practice, as the case 
may be, by ALZA or others under a Product Development Program undertaken 
pursuant to this Agreement or (b) are in any manner acquired by, or otherwise 
obtained on behalf of TDC during the term of this Agreement from persons 
other than ALZA and necessary or useful to the development or 
commercialization of Products.

          1.5  "Development Cost(s)" shall mean the cost of the activities 
undertaken pursuant to this Agreement, determined in accordance with Exhibit 
A hereto.

          1.6  "Distribution" shall mean the distribution by ALZA of units 
comprising one share of TDC Class A Common Stock and one warrant to acquire 
one-eighth of a share of ALZA Class A Common Stock to ALZA stockholders of 
record on May 28, 1993.


                                      -2-
<PAGE>

          1.7  "Drug" shall mean a therapeutic compound specified in a work 
plan under Section 2.1 or 2.3.

          1.8  "FDA" shall mean the United States Food and Drug 
Administration or any successor agency whose approval is necessary to market 
a Product in the United States.

          1.9  "License Option" shall mean the option granted to ALZA under 
the License Option Agreement to obtain licenses to Products, on a Product by 
Product basis, as described in the License Option Agreement.

          1.10 "License Option Agreement" shall mean the License option 
Agreement between ALZA and TDC dated as of the date hereof.

          1.11 "Major Market Country" shall mean any of the United States, 
the United Kingdom, France, Germany, Italy or Japan.

          1.12 "Net Sales" shall mean the total amount invoiced in United 
States dollars (or converted thereto in accordance with Section 7.8) on sales 
by ALZA and its Affiliates to independent, unrelated third parties (other 
than distributors or sublicensees who make payments that constitute 
Sublicensing Revenues) in bona fide arms' length transactions, less the 
following deductions, in each case related specifically to the product in 
question and actually allowed and taken by such third parties and not 
otherwise recovered by or reimbursed to ALZA or its Affiliates: (i) trade, 
cash and quantity discounts; (ii) taxes on sales (such as sales or use taxes) 
to the extent added to the sales price and set forth separately as such in 
the total amount invoiced; (iii)


                                      -3-
<PAGE>

freight, insurance and other transportation charges to the extent added to 
the sales price and set forth separately as such in the total amount 
invoiced; and (iv) amounts repaid or credited by reason of rejections, 
defects or returns or because of retroactive price reductions, or due to 
government laws or regulations requiring rebates.  Net Sales shall not 
include sales between or among ALZA and its Affiliates or Sublicensing 
Revenues.

          1.13 "Other Royalty-Bearing Product" shall mean, in any country, 
any human pharmaceutical product (other than a Product) covered in such 
country at the time of sale by an ALZA Patent covering Developed Technology.

          1.14 "Product" shall mean a Product Candidate that is accepted for 
development pursuant to Section 2.3.

          1.15 "Product Candidate" shall mean a Drug combined with a System 
for which a work plan is proposed by ALZA in accordance with Section 2.1.

          1.16 "Product Development Program" shall mean a program to develop 
a Product.

          1.17 "Proprietary Rights" shall mean data, inventions, information, 
processes, know-how and trade secrets, and patents or patent applications 
covering any of the foregoing, owned by or licensed to a person and which 
such person has the right to license.  Proprietary Rights shall not include 
trademarks.

          1.18 "Purchase Option" shall mean that certain option to purchase 
all of the outstanding shares of TDC Class A Common


                                      -4-
<PAGE>

Stock that is granted to ALZA pursuant to TDC's Certificate of Incorporation, 
as amended as of the date hereof.

          1.19 "Special Royalty Payments" shall mean "front-end" distribution 
fees, prepaid royalties and similar one-time, infrequent or special payments. 
Solely for purposes of calculating a buyout price under Section 7.5, any 
Special Royalty Payments will be amortized over a period of 28 calendar 
quarters, beginning with the quarter in which such payment is made.

          1.20 "Sublicensing Revenues" shall mean (a) any royalties or 
percentage of sales payments received by ALZA or any of its Affiliates under 
either (i) any sublicense for the manufacture, use or sale of the product in 
question or (ii) any distribution agreement entered into with a distributor 
who agrees to pay royalties or make percentage of sales payments to ALZA or 
any of its Affiliates in respect of the manufacture, use or sale of such 
product and (b) any Special Royalty Payments received by ALZA or its 
Affiliates in respect of such product, in each case excluding amounts paid to 
reimburse ALZA for research and development or manufacturing costs.

          1.21 "System" shall mean a delivery system for the controlled 
release of a Drug, based upon, utilizing or arising out of ALZA Proprietary 
Rights. The term "System" shall include anything incorporated in or used in 
connection with, or which is an attribute of, a Product, other than a 
therapeutic agent (including anything which affects or may affect the 
pharmacodynamics, pharmacokinetics, stability or absorption of a


                                      -5-
<PAGE>

therapeutic agent or the formulation, stabilization or use of a therapeutic 
agent in the System).

          1.22 "Technology License Agreement" shall mean the Technology 
License Agreement dated as of the date hereof between ALZA and TDC.

                                    SECTION 2
                                    ---------

                            PRODUCT DEVELOPMENT PROGRAM
                            ---------------------------

          2.1  PRODUCT CANDIDATE WORK PLANS.  Within 60 days after the date 
hereof, and from time to time hereafter, ALZA shall provide TDC with a list 
of possible Product Candidates together with initial work plans that provide 
for each Product Candidate an estimate of the total Development Costs to 
determine the likelihood that the System included in such Product Candidate 
could meaningfully enhance the therapeutic value of the Drug included in such 
Product Candidate, and any other factors that the parties deem appropriate to 
determine whether to select a Product Candidate for development.  Within 45 
days after ALZA provides TDC with such a proposed work plan for a Product 
Candidate, TDC shall notify ALZA of its acceptance or rejection of such work 
plan.

          2.2  PRODUCT SELECTION.  TDC hereby hires ALZA to perform all 
activities under work plans approved under Section 2.1. ALZA diligently shall 
perform or cause to be performed the activities under each accepted work 
plan, as amended from time to time so as to remain a best estimate of the 
work to be performed to complete the work plan for each Product Candidate and 
of the Development Costs thereof.


                                      -6-
<PAGE>

          2.3  PRODUCT DEVELOPMENT.  Within 45 days after completion of a 
work plan under Section 2.2 for a Product Candidate, ALZA shall provide TDC 
with a written report of ALZA's assessment of the technical and economic 
feasibility of development of such Product Candidate and, based thereon, 
ALZA's good faith recommendation of whether to proceed with development of 
such Product Candidate. If ALZA does not recommend development of a Product 
Candidate, TDC shall have no rights with respect to such Product Candidate; 
provided that ALZA may not further develop any such Product Candidate during 
the term of this Agreement unless it first recommends it to TDC for 
development in accordance with the other terms of this Agreement.  If ALZA 
recommends development for a Product Candidate, then such report to TDC shall 
include initial work plans that provide for such Product Candidate an 
estimate of the total Development Costs for a Product Development Program 
through the filing for FDA approval to market the Product, milestones 
(including the timetable for the development of the Product), and detailed 
work plans and cost estimates for the first 12 months of the Product 
Development Program.  Within 45 days after ALZA provides TDC with a proposed 
work plan for a Product Development Program for a Product Candidate, TDC 
shall notify ALZA in writing of its acceptance or rejection of such work 
plan.  Upon written acceptance of a work plan under this Section 2.3 for a 
Product Candidate, such Product Candidate shall be deemed to be a "Product." 
ALZA and TDC shall maintain a complete list of the Products at all times.


                                      -7-
<PAGE>

          2.4  LATER REQUESTS.  If TDC fails to accept a recommended Product 
Candidate for development as a Product within the 45 day period specified in 
Section 2.3, then, at any time during the term of this Agreement, TDC may 
request ALZA to perform a Product Development Program for such Product 
Candidate and ALZA shall undertake its duties with respect to such Product 
Development Program, all in accordance with this Section 2, unless, at the 
time of such request, ALZA is then undertaking the development of such 
Product Candidate for its own account or with a third party, or ALZA is 
otherwise not permitted to undertake such development hereunder because of an 
arrangement with a third party.

                                    SECTION 3
                                    ----------

                          RESEARCH AND DEVELOPMENT PROGRAMS;
                                   ALZA SERVICES
                                   -------------

          3.1  PRODUCT DEVELOPMENT - TDC OBLIGATIONS.  Once a Product is 
selected pursuant to Section 2.3, TDC shall use diligent efforts to develop 
such Product. TDC shall request that ALZA perform, or shall use diligent 
efforts to cause a third party to perform, the activities under each approved 
work plan; provided, however, that ALZA's prior written consent shall be 
required for a third party to perform any activities that involve ALZA 
Proprietary Rights or that could affect ALZA's rights under any agreement 
between ALZA and TDC or ALZA's rights as holder of the Class B Common Stock 
of TDC.  TDC shall use diligent efforts to cause each contractor other than 
ALZA diligently to perform the activities assigned it under a work plan.


                                      -8-
<PAGE>

          3.2  PRODUCT DEVELOPMENT - ALZA OBLIGATIONS; OTHER ALZA ACTIVITIES. 
TDC hereby hires ALZA to perform certain research, development and 
experimentation activities to develop Products in accordance with the tasks 
assigned to ALZA under the work plans approved under Section 2.3, and to 
undertake such other activities as the parties may agree.  ALZA diligently 
shall perform or cause to be performed such activities.  In connection 
therewith, ALZA shall make available such of its scientific, engineering, 
manufacturing and other personnel, and shall take such steps, as it deems 
necessary in order to perform its obligations in accordance with the terms 
hereof, but ALZA is not obligated to devote any specific amount of time or 
resources to activities hereunder. ALZA shall have full discretion to 
determine from time to time the allocation of resources of ALZA (facilities, 
equipment and personnel) that are available to TDC for Product Development 
Programs, and to determine from time to time the allocation of resources of 
ALZA among Product Development Programs.  TDC understands, acknowledges and 
agrees that ALZA may devote substantial time and resources to research and 
development activities for other persons and for its own account, and as a 
result, ALZA may develop and commercialize, or have commercialized, products 
competitive with the Products.

          3.3  WORK PLANS AND COST ESTIMATES.  The parties understand and 
acknowledge that it is difficult to predict accurately the activities that 
will be necessary to develop any Product, or the Development Costs thereof, 
and that significant uncertainties exist in any Product development effort.  
TDC and


                                      -9-
<PAGE>

ALZA shall cooperate in good faith with respect to mutually acceptable work 
plans and cost estimates for Product Development Programs and for such other 
activities as the parties may agree.  Such work plans and cost estimates 
shall be subject to review and revision from time to time, at least on a 
semi-annual basis.  Each party diligently shall execute such work plans and 
shall report significant deviations therefrom in a timely manner.  TDC shall 
not be obligated to pay Development Costs in excess of those provided in 
approved work plans and cost estimates, and ALZA shall not be obligated to 
perform work which would result in Development Costs exceeding approved cost 
estimates.

          3.4  THIRD PARTY RIGHTS.  Subject to the terms and conditions of 
this Agreement, TDC shall have discretion to attempt to obtain, using 
Available Funds, any Proprietary Rights from any third party that TDC 
reasonably determines to be necessary or useful to conduct Product 
Development Programs under this Agreement.  Such Proprietary Rights shall be 
included in the Developed Technology.

          3.5  CONSULTATION.  TDC shall consult with ALZA and shall review 
with ALZA from time to time the progress toward completion of each work plan 
for each Product under development, including without limitation, the status 
in each country for which marketing approval is being sought.

          3.6  NO USE OF AVAILABLE FUNDS AFTER LICENSE.  After such time as 
either (i) ALZA exercises the License Option for a Product in a country or 
(ii) such License Option expires


                                      -10-
<PAGE>

unexercised in such country, no additional Available Funds shall be expended 
with respect to such Product in such country.

                                    SECTION 4
                                    ---------

                       PAYMENT FOR SERVICES; TIMING OF PAYMENTS
                       ----------------------------------------

          4.1  PAYMENT OF DEVELOPMENT COSTS.  In consideration of the work to 
be carried out by ALZA hereunder, TDC shall reimburse ALZA for all of its 
Development Costs in accordance with approved work plans and costs estimates.

          4.2  TIMING OF PAYMENTS.  TDC shall pay to ALZA monthly, in 
arrears, all Development Costs incurred by ALZA during the preceding calendar 
month, within 30 days after ALZA's invoice therefor.

          4.3  SUFFICIENCY OF FUNDS.  Neither TDC nor ALZA makes any 
warranty, express or implied, that Available Funds will be sufficient to 
complete the development of any Product or Products.

                                   SECTION 5
                                   ---------

                               REPORTS AND RECORDS
                               -------------------

          5.1  QUARTERLY AND FINAL REPORTS.  Within 45 days after the end of 
each calendar quarter, ALZA shall provide to TDC, and TDC shall require each 
third party contractor to provide to TDC and to ALZA, a reasonably detailed 
report setting forth (a) a summary of the work performed hereunder by ALZA 
and any third party contractor, as appropriate, and their respective 
employees and agents during such quarter; and (b) the total Development Costs 
of such activities during such quarter and cumulatively to date, on a Product 
by Product basis.


                                      -11-
<PAGE>

          5.2  AVAILABLE FUNDS REPORT.  Within 45 days after the end of each 
calendar quarter, TDC shall provide to ALZA a reasonably detailed report 
setting forth a reconciliation of the use of all Available Funds to the date 
of such request.

          5.3  RECORDS.  Each of TDC and ALZA shall keep and maintain, in 
accordance with generally accepted accounting principles, proper and complete 
records and books of account documenting all Development Costs.  Each of TDC 
and ALZA shall have the right, at all reasonable times during regular 
business hours, and at its own expense, to examine or to have examined by a 
certified public accountant or similar person reasonably acceptable to the 
other party, pertinent books and records of one another, for the sole purpose 
of determining the correctness of Development Costs invoiced by ALZA 
hereunder and the application of Available Funds by TDC.  Such examination 
shall take place not later than two years following the year in question, and 
only one examination may take place with respect to any period as to which 
such books and records are examined.  TDC shall obtain, for itself and for 
ALZA, similar reasonable rights to audit the Development Costs of each third 
party contractor.

                                 SECTION 6
                                 ---------

                     LICENSE OF TECHNOLOGY FOR DEVELOPMENT
                     -------------------------------------

          6.1  LICENSE TO USE ALZA PROPRIETARY RIGHTS.  TDC hereby grants to 
ALZA a sublicense under the Technology License Agreement solely for the 
purpose of conducting the activities contemplated hereunder.


                                      -12-
<PAGE>

          6.2  TERMINATION OF LICENSE.  Termination of the license granted 
under the Technology License Agreement automatically shall terminate the 
sublicense to the Licensed Technology granted to ALZA under this Agreement.

                                   SECTION 7
                                   ----------

                    OWNERSHIP AND LICENSE OF DEVELOPED TECHNOLOGY;
                 PATENTS; ROYALTIES ON OTHER ROYALTY-BEARING PRODUCTS
                 ----------------------------------------------------

          7.1  OWNERSHIP OF PRODUCTS.  TDC shall own all Products, subject to 
the License Option.

          7.2  OWNERSHIP OF DEVELOPED TECHNOLOGY.  ALZA shall own all 
Developed Technology.

          7.3  PATENTS COVERING DEVELOPED TECHNOLOGY.  ALZA shall determine 
whether and to what extent to seek and maintain United States and/or foreign 
patents with respect to any inventions included in Developed Technology. Any 
such patents and applications therefor shall be in ALZA's name and shall be 
owned by ALZA.  TDC and ALZA each shall pay one-half of the costs of 
obtaining and maintaining any such patents during the term of this Agreement.

          7.4  ROYALTIES ON OTHER ROYALTY-BEARING PRODUCTS.  ALZA shall pay 
TDC royalties in respect of sales of each other Royalty-Bearing Product.  
Such royalties shall equal the sum of (a) 1% of the Net Sales in the relevant 
country or countries of such Other Royalty-Bearing Product; and (b) 10% of 
Sublicensing Revenues in the relevant country or countries with respect to 
such Other Royalty-Bearing Product; provided, however, that in determining 
payments due under this Section 7.4, Net Sales and Sublicensing Revenues 
shall be reduced by the dollar amount of


                                      -13-
<PAGE>

any license or similar payments due to third parties from ALZA with respect 
to any such sales and Sublicensing Revenues of such other Royalty-Bearing 
Product. Only one royalty under this Section 7.4 shall be payable by ALZA to 
TDC with respect to any particular Net Sales or Sublicensing Revenues of each 
Other Royalty-Bearing Product in any country, regardless of the number of 
patents covering such Other Royalty-Bearing Product in such country.

          7.5  BUYOUT OF OTHER ROYALTY-BEARING PRODUCT ROYALTIES.  ALZA shall 
have the option, in its discretion, at any time from and after the end of the 
twelfth full calendar quarter following the first commercial sale in each 
country of any Other Royalty-Bearing Product, to buy out its remaining 
obligation to make payments under Section 7.4 with respect to sales of such 
other Royalty-Bearing Product in such country.  The buyout price shall be an 
amount equal to 15 times the payments made by or due to TDC from ALZA under 
Section 7.4 with respect to sales of such other Royalty-Bearing Product in 
such country during the four most recent calendar quarters preceding the date 
of exercise of the buyout option for which royalties were paid or were due in 
respect of such country.  ALZA shall have the option, in its discretion, at 
any time from and after the end of the twelfth full calendar quarter 
following the first commercial sale of any Other Royalty-Bearing Product as 
to which payments are due under Section 7.4 in either the United States or 
two other Major Market Countries, to buy out its remaining worldwide 
obligations to make payments under Section 7.4 with respect to such Other



                                      -14-
<PAGE>

Royalty-Beating Product.  The buyout price shall be an amount equal to 20 
times the payments made by or due to TDC from ALZA under Section 7.4 during 
the four most recent calendar quarters preceding the date of exercise of the 
buyout option for which royalties were paid or were due on a worldwide basis 
with respect to such Other Royalty-Bearing Product under Section 7.4 (and, in 
addition, such payments as would have been paid by or due from ALZA to TDC if 
ALZA had not exercised any country-specific buyout option with respect to 
such Other Royalty-Bearing Product) less any amounts previously paid to 
exercise any country-specific buyout option with respect to such Other 
Royalty-Bearing Product.

          7.6  REPORTS.  Within 90 days after the end of each calendar 
quarter for which royalties are due under Section 7.4, ALZA shall render an 
accounting to TDC, on a country-by-country basis, with respect to all 
payments due for such quarter under Section 7.4. Such report shall indicate 
for such quarter, the quantity and dollar amount of sales of each Other 
Royalty-Bearing Product by ALZA and its Affiliates, and Sublicensing Revenues 
received by ALZA with respect to which payments are due; provided, however, 
that if ALZA shall not have received from any foreign sublicensee or 
distributor a report of its sales for such quarter, then such sales shall be 
included in the next quarterly report. In case no payment is due for any 
calendar quarter, ALZA shall so report.  ALZA shall keep accurate records in 
sufficient detail to enable the payments due hereunder to be determined.

          7.7  REVIEW BY ACCOUNTANTS.  At TDC's request, ALZA shall permit an 
independent public accountant selected by TDC to


                                      -15-
<PAGE>

have access, once in each calendar year during regular business hours and 
upon reasonable notice to ALZA, to such of the records of ALZA as may be 
necessary to verify the accuracy of the payments and reports made under 
Sections 7.4 and 7.6, but said accountant shall not disclose to TDC any 
information except that which should have been properly contained in such 
reports.  The right of review with respect to any quarterly accounting shall 
terminate two years after TDC's receipt of the royalties due with respect to 
such quarter.

          7.8  PAYMENTS.  Payments shown by each calendar quarter report to 
have accrued shall be due and payable on the date the report is due and shall 
be paid in United States dollars.  Any and all taxes due or payable on such 
payments or with respect to the remittance thereof shall be deducted from 
such payments and shall be paid by ALZA to the proper taxing authorities, and 
proof of payment shall be secured and sent to TDC as evidence of such 
payment.  The rate of exchange to be used in computing the amount of United 
States dollars due to TDC in satisfaction of payment obligations with respect 
to sales in foreign countries shall be calculated by converting the amount 
due in such foreign currency into United States dollars based on the rate for 
the purchase of United States dollars with such currency as published in the 
WALL STREET JOURNAL on the last business day of the calendar quarter for 
which payment is being made.  If governmental regulations prevent remittance 
from any foreign country of any amounts due under Section 7.4 in respect of 
that country, ALZA shall so notify TDC in writing, and the obligation under 
this Agreement to


                                      -16-
<PAGE>

make payments in respect of sales in that country shall be suspended (but the 
amounts due but not paid shall continue to accrue) until such remittances are 
possible.  TDC shall have the right, upon written notice to ALZA to receive 
payment in any such country in the local currency.

          7.9  LATE PAYMENTS.  Any payments due hereunder that are not made 
when due shall accrue interest at the lesser of 10% per annum or the maximum 
rate as may be allowed by law, beginning on the date when TDC notifies ALZA 
that such payments are overdue.

                                    SECTION 8
                                    ----------

                                ACCESS TO INFORMATION
                                ---------------------

          8.1  ACCESS.  Subject to the terms of this Agreement, each party 
shall be permitted access to the premises of the other during normal business 
hours, for the purpose of monitoring the progress of activities under this 
Agreement.  Each party shall keep full and complete records and notebooks 
containing all experiments performed during its work under this Agreement and 
the results thereof.  Such items and copies of all documentation shall be 
available during normal business hours for inspection by the other party.  In 
addition, each party shall provide to the other such other information as 
reasonably may be requested.

          8.2  THIRD PARTIES.  TDC shall cause each third party contractor to 
provide access similar to that to be provided pursuant to Section 8.1, for 
the benefit of both TDC and ALZA.

          8.3  CONFIDENTIALITY.  During the term of this Agreement and for a 
period of 10 years following its termination,


                                      -17-
<PAGE>

each party shall maintain in confidence all Proprietary Rights of the other; 
provided, however, that nothing contained herein shall prevent either party 
from disclosing any Proprietary Rights to the extent that such Proprietary 
Rights (a) are required to be disclosed in connection with the development of 
or securing necessary governmental authorization for the marketing of 
Products, or to make, use and sell Products as permitted or provided in the 
agreements between the parties, (b) are required to be disclosed by law for 
the purpose of complying with governmental regulations, (c) are disclosed to 
sublicensees permitted under the Technology License Agreement in connection 
with the development, manufacturing or marketing of Products, subject to 
similar obligations of confidentiality on the part of such third parties as 
required by the Technology License Agreement, (d) are known to the recipient 
prior to the date hereof as evidenced by the recipient's written records; (e) 
are lawfully disclosed to the recipient by a third party having the right to 
disclose such information to the recipient; or (f) either before or after the 
time of disclosure to the recipient, become known to the public other than by 
an unauthorized act or omission of the recipient or any of the recipient's 
employees or agents.  ALZA Proprietary Rights may be disclosed to third 
parties only in accordance with the provisions of Section 10.4 hereof and in 
accordance with the provisions of the Technology License Agreement.  The 
obligations of each of the parties pursuant to this Section 8.3 shall survive 
the termination of this Agreement for any reason. Any breach of this Section 
8.3


                                      -18-
<PAGE>

shall result in irreparable harm, and in the event of a breach, the aggrieved 
party shall be entitled to injunctive relief (without the need to post a 
bond) in addition to any other remedies available at law or in equity.

                                   SECTION 9
                                   ---------

                                  DISCLAIMERS
                                  -----------

          9.1  DISCLAIMER.  ALZA DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY 
(i) THAT ALZA PROPRIETARY RIGHTS (INCLUDING ANY DEVELOPED TECHNOLOGY), OR THE 
USE THEREOF, OR PRODUCT CANDIDATES OR PRODUCTS INCORPORATING OR MANUFACTURED 
BY THE USE THEREOF, WILL BE FREE FROM CLAIMS OF PATENT INFRINGEMENT, 
INTERFERENCE OR UNLAWFUL USE OF PROPRIETARY INFORMATION OF ANY THIRD PARTY 
AND (ii) OF THE ACCURACY, RELIABILITY, TECHNOLOGICAL OR COMMERCIAL VALUE, 
COMPREHENSIVENESS OR MERCHANTABILITY OF ALZA PROPRIETARY RIGHTS AND DEVELOPED 
TECHNOLOGY OR THEIR SUITABILITY OR FITNESS FOR ANY PURPOSE WHATSOEVER 
INCLUDING, WITHOUT LIMITATION, THE DESIGN, DEVELOPMENT, MANUFACTURE, USE OR 
SALE OF PRODUCTS.  ALZA DISCLAIMS ALL OTHER WARRANTIES OF WHATEVER NATURE, 
EXPRESS OR IMPLIED.

                                   SECTION 10
                                   ----------

                                   COVENANTS
                                   ---------

          10.1 USE OF AVAILABLE FUNDS.  TDC agrees to expend all Available 
Funds for activities undertaken pursuant to this Agreement, unless ALZA 
agrees otherwise. Pending application of all Available Funds as set forth 
above, Available Funds shall be invested in securities issued or guaranteed 
as to principal and interest by the United States, or by a person controlled 
or


                                      -19-
<PAGE>

supervised by or acting as an instrumentality of the government of the United 
States pursuant to authority granted by the Congress of the United States, or 
any certificate of deposit for any of the foregoing, or any other investment 
that is approved by ALZA in its sole discretion.

          10.2 NEGATIVE PLEDGE.  TDC shall not create, incur, assume or 
suffer to exist any lien upon or with respect to, or otherwise take any 
action with respect to, Available Funds so as to prevent or interfere with 
full expenditure of such funds for activities under this Agreement in 
accordance with Section 10.1.

          10.3 PROTECTION OF AVAILABLE FUNDS.  As soon as practicable 
following execution of this Agreement, TDC shall make arrangements 
satisfactory to ALZA to ensure that Available Funds will remain available for 
expenditure under this Agreement.

          10.4 NO INCONSISTENT AGREEMENTS.  Without the written consent of 
ALZA, TDC shall not enter into any agreement or arrangement that is in any 
way inconsistent with or that could adversely affect ALZA's rights under any 
agreement between ALZA and TDC, or that is in any way inconsistent with or 
that could adversely affect ALZA's rights as holder of the Class B Common 
Stock of TDC.  TDC must include in any agreement between TDC and a third 
party relating to Products, Developed Technology and/or activities hereunder 
such provisions as ALZA reasonably deems appropriate to protect ALZA 
Proprietary Rights and to protect ALZA's rights under all agreements between 
ALZA and TDC and under the Purchase Option.


                                      -20-
<PAGE>

                                   SECTION 11
                                   ----------

                               TERM AND TERMINATION
                               --------------------

          11.1 AUTOMATIC TERMINATION.  This Agreement shall terminate upon 
expiration of the Purchase Option, except that ALZA's obligations to make 
payments to TDC with respect to Other Royalty-Bearing Products shall continue 
as provided in Section 7 hereof.

          11.2 OTHER TERMINATION.  Either party may, in its discretion, 
terminate this Agreement and its term in the event that the other party:

               (a)  breaches any material obligation hereunder or under the 
Technology License Agreement, the License Option Agreement, or any license 
thereunder, and such breach continues for a period of 60 days after written 
notice thereof by the terminating party to the other party; or

               (b)  enters into any proceeding, whether voluntary or 
otherwise, in bankruptcy, reorganization or arrangement for the appointment 
of a receiver or trustee to take possession of its assets or any other 
proceeding under any law for the relief of creditors, or makes an assignment 
for the benefit of its creditors.

                                 SECTION 12
                                 ----------

                                FORCE MAJEURE
                                -------------

          12.1 FORCE MAJEURE.  Neither party to this Agreement shall be 
liable for delay in the performance of any of its obligations hereunder if 
such delay is due to causes beyond its reasonable control including, without 
limitation, acts of God,


                                      -21-
<PAGE>

fires, strikes, acts of war, or intervention of any governmental authority, 
but any such delay or failure shall be remedied by such party as soon as 
possible.

                                    SECTION 13
                                    ----------

                                   MISCELLANEOUS
                                   -------------

          13.1 AMENDMENT.  Any waiver by either party hereto of a breach of 
any provisions of this Agreement shall not be implied and shall not be valid 
unless such waiver is recited in writing and signed by such party.  Failure 
of any party to require, in one or more instances, performance by the other 
party in strict accordance with the terms and conditions of this Agreement 
shall not be deemed a waiver or relinquishment of the future performance of 
any such terms or conditions or of any other terms and conditions of this 
Agreement.  A waiver by either party of any term or condition of this 
Agreement shall not be deemed or construed to be a waiver of such term or 
condition for any other term.  All rights, remedies, undertakings, 
obligations and agreements contained in this Agreement shall be cumulative 
and none of them shall be a limitation of any other remedy, right, 
undertaking, obligation or agreement of either party.  This Agreement may not 
be amended except in a writing signed by both parties.

          13.2 ASSIGNMENT.  Neither party may assign its rights and 
obligations hereunder without the prior written consent of the other party, 
which consent may not be unreasonably withheld; provided, however, that ALZA 
may assign such rights and obligations hereunder to any person or entity with 
which ALZA is


                                      -22-
<PAGE>

merged or consolidated or which purchases all or substantially all of the 
assets of ALZA.  ALZA may subcontract all or any portion of its duties 
hereunder to third parties, in its sole discretion.

          13.3 ARBITRATION.

               13.3.1  ARBITRATION.  All disputes which may arise under, out 
of or in connection with this Agreement shall be settled by arbitration 
conducted in the city of San Francisco, State of California, in accordance 
with the then existing rules of the American Arbitration Association, and 
judgment upon the award rendered by the arbitrators may be entered in any 
court having jurisdiction thereof.  The parties hereby agree that service of 
any notices in the course of such arbitration at their respective addresses 
as provided for in Section 13.7 of this Agreement shall be valid and 
sufficient.

                 13.3.2  ARBITRATORS.  In any arbitration pursuant to this 
Section 13.3, the award shall be rendered by a majority of the members of a 
board of arbitration consisting of three members who shall be appointed by 
the parties jointly, or if the parties cannot agree as to three arbitrators 
within 30 days after the commencement of the arbitration proceeding, then one 
arbitrator shall be appointed by ALZA and one arbitrator shall be appointed 
by TDC within 60 days after the commencement of the arbitration proceeding.  
The third arbitrator shall be appointed by mutual agreement of such two 
arbitrators.  In the event of failure of the two arbitrators to agree within 
75 days after commencement of the arbitration proceeding upon the appointment


                                      -23-
<PAGE>

of the third arbitrator, the third arbitrator shall be appointed by the 
American Arbitration Association in accordance with its then existing rules. 
Notwithstanding the foregoing, in the event that any party shall fail to 
appoint an arbitrator it is required to appoint within the specified time 
period, such arbitrator and the third arbitrator shall be appointed by the 
American Arbitration Association in accordance with its then existing rules.  
For purposes of this Section 13.3, the "commencement of the arbitration 
proceeding" shall be deemed to be the date upon which a written demand for 
arbitration is received by the American Arbitration Association from one of 
the parties.

          13.4 COUNTERPARTS.  This Agreement may be executed in any number of 
counterparts, each of which when so executed shall be deemed to be an 
original and all of which when taken together shall constitute this Agreement.

          13.5 GOVERNING LAW.  This Agreement shall be governed by the laws 
of the state of California as applied to residents of that state entering 
into contracts to be performed in that state.

          13.6 HEADINGS.  The headings set forth at the beginning of the 
various sections of this Agreement are for reference and convenience and 
shall not affect the meanings of the provisions of this Agreement.

          13.7 NOTICES.  Notices required under this Agreement shall be in 
writing and sent by registered or certified mail, postage prepaid, or by 
telex or facsimile and confirmed by registered or certified mail and 
addressed as follows:


                                      -24-
<PAGE>

                   If to ALZA:         ALZA Corporation 
                                       950 Page Mill Road
                                       P.0. Box 10950 
                                       Palo Alto, CA  94303-0802
                                       Attention:  Vice President, Legal

                   If to TDC:          Therapeutic Discovery Corporation
                                       1290 Page Mill Road
                                       P.O. Box 10051
                                       Palo Alto, CA  94303-0860
                                       Attention:  Chief Executive officer

All notices shall be deemed to be effective five days after the date of 
mailing or upon receipt if sent by telex or facsimile (but only if followed 
by certified or registered confirmation).  Either party may change the 
address at which notice is to be received by written notice pursuant to this 
Section 13.7.

          13.8 PUBLIC DISCLOSURE.  Neither party shall disclose to third 
parties, nor originate any publicity, news release or public announcement, 
written or oral, whether to the public, the press, stockholders or otherwise, 
referring to the existence or terms of this Agreement, the subject matter to 
which it relates, the performance under it or any of its specific terms and 
conditions, except such announcements, as in the opinion of the counsel for 
the party making such announcement, are required by law, including United 
States securities laws, rules or regulations, without the prior written 
consent of the other party.  If a party decides to make an announcement it 
believes to be required by law with respect to this Agreement, it will give 
the other party such notice as is reasonably practicable and an opportunity 
to comment upon the announcement.

          13.9 SEVERABILITY.  If any provision of this Agreement is held by a 
court of competent jurisdiction to be invalid or


                                      -25-
<PAGE>

unenforceable, it shall be modified, if possible, to the minimum extent 
necessary to make it valid and enforceable or, if such modification is not 
possible, it shall be stricken and the remaining provisions shall remain in 
full force and effect; provided, however, that if a provision is stricken so 
as to significantly alter the economic arrangements of this Agreement, the 
party adversely affected may terminate this Agreement upon 60 days' prior 
written notice to the other party.

          13.l0 RELATIONSHIP OF THE PARTIES.  For all purposes of this 
Agreement, TDC and ALZA shall be deemed to be independent entities and 
anything in this Agreement to the contrary notwithstanding, nothing herein 
shall be deemed to constitute TDC and ALZA as partners, joint ventures, 
co-owners, an association or any entity separate and apart from each party 
itself, nor shall this Agreement constitute any party hereto an employee or 
agent, legal or otherwise, of the other party for any purposes whatsoever.  
Neither party hereto is authorized to make any statements or representations 
on behalf of the other party or in any way obligate the other party, except 
as expressly authorized in writing by the other party.  Anything in this 
Agreement to the contrary notwithstanding, no party hereto shall assume nor 
shall be liable for any liabilities or obligations of the other party, 
whether past, present or future.

          13.11 SURVIVAL.  The provisions of Sections 1, 5, 7, 8, 9, 11, 
13.3, 13.5, 13.7, 13.8, 13.9, 13.10 and this Section 13.11 survive the 
termination for any reason of this Agreement.  Neither party shall be liable 
to the other due to the


                                      -26-
<PAGE>

termination of this Agreement as provided herein, whether in loss of good 
will, anticipated profits or otherwise.  In addition, any payments due under 
this Agreement with respect to any period prior to its termination shall be 
made notwithstanding the termination of this Agreement.



                                      -27-
<PAGE>

          IN WITNESS WHEREOF, the parties hereto have caused this Agreement 
to be executed as of the date first written above by their duly authorized 
representatives.

                                   ALZA CORPORATION

                                   By: /s/ Jane E. Shaw
                                      ------------------------------------------
                                   Title:  President and Chief Operating Officer
                                         ---------------------------------------

                                   THERAPEUTIC DISCOVERY CORPORATION


                                   By: /s/ Pieter P. Bonsen
                                      ----------------------------
                                   Title:  President
                                         -------------------------




                                      -28-
<PAGE>

                                   EXHIBIT A

                                DEVELOPMENT COSTS
                                -----------------

Development Costs are equal to the sum of (i) Research Expenses, (ii) General 
and Administrative Expenses and (iii) Capital Asset Expenditures.

     (i)  Research Expenses include both Direct Expenses and Indirect Expenses,
          with the cost elements outlined on Exhibit A-1.

          (a)  Direct Expenses include Direct Research Salaries, 
               Clinical Expenses, Supplies and other expenses incurred 
               specifically in connection with the Program.

          (b)  Indirect Expenses include Research Management and support 
               costs of the research and product development 
               organization. (Indirect Expenses are allocated to all 
               projects and billed to clients at a fixed rate* of 160% 
               of Direct Research Salaries.)

     (ii)  General and Administrative Expenses include cost elements 
           outlined on Exhibit A-2. (General and Administrative Expenses 
           are allocated among the research and product development, 
           manufacturing and marketing organizations. The portion 
           allocated to the research and product development organization 
           is then allocated to all projects and billed to clients at a 
           fixed rate* of 80% of Direct Research Salaries.)

     (iii) Capital Asset Expenditures are the actual costs of new capital
           assets acquired specifically for the project.



- -------------------------

*   This fixed billing rate will not be changed prior to January 1, 
    1994 and, if changed on or after January 1, 1994, such 
    changes will be limited to not more than one change per 
    calendar year and shall be a maximum of 10% of the rate in 
    effect at the time of the increase.

<PAGE>

                                EXHIBIT A-1

                             Research Expenses
                             -----------------


DIRECT EXPENSES

Direct Research Salaries*

Project Clinical Expenses and Outside Services

Project Specific Supplies

Project Travel and Related Expenses

Miscellaneous Project Expenses


INDIRECT EXPENSES

Research Management and Indirect Salaries*

General Research Supplies and Materials

General Research Consulting and Outside Services

Facilities Expenses

Telephone and Communications

Equipment Depreciation, Rent, Maintenance and Services

Research Travel and Related Expenses

Patent and Trademark Expenses

Miscellaneous Indirect Research Expenses 



*Salaries include Benefits

<PAGE>

                                EXHIBIT A-2

                    General and Administrative Expense
                    ----------------------------------


Corporate Management, Administrative, and Indirect Salaries*

Telephone and Communications

Equipment Depreciation, Rent, Maintenance and Services

Board of Directors and Corporate Consulting

Annual Audit, Accounting and Legal Expenses

Facilities Expenses

Net Interest Expense

Miscellaneous General and Administrative Expenses






*Salaries include Benefits


<PAGE>

                             LICENSE OPTION AGREEMENT

     AGREEMENT made as of the 10th day of March, 1993 by and between ALZA
Corporation, a Delaware corporation ("ALZA") and Therapeutic Discovery
Corporation, a Delaware corporation ("TDC").

                                      RECITALS

     A.   As of the date hereof, ALZA and TDC have entered into a Technology
License Agreement and a Development Contract.

     B.   Pursuant to the Development Agreement, TDC will employ ALZA and
possibly third party contractors to perform the research and development work
described therein, which is anticipated to result in Products.

     C.   In order to carry out the commercial exploitation of Products and in
consideration of the agreements described above, TDC desires to grant to ALZA an
option as set forth herein.

     NOW, THEREFORE, the parties agree as follows: 

     l.   DEFINITIONS.

     For purposes of this Agreement, the following terms shall have the meanings
set forth below:

          1.1  "Development Contract" shall mean the Development Agreement dated
as of the date hereof between TDC and ALZA.

          1.2  "License Agreement" shall mean an exclusive license agreement for
a particular Product between ALZA and TDC in the form of Exhibit A to this
Agreement.

<PAGE>

          1.3  "License Option" shall mean the option granted to ALZA, pursuant
to Section 2 of this Agreement, to enter into License Agreements for Products,
on a Product by Product basis.

          1.4  "NDA" shall mean a new drug application as that term is defined
in the Federal Food, Drug and Cosmetic Act or any successor application filed
with the FDA requesting permission to market a Product.

          1.5  "Product" shall mean a product accepted for development under the
Development Contract.

          1.6  "Purchase Option" shall mean that certain option to purchase all
of the outstanding shares of TDC Class A Common Stock that is granted to ALZA
pursuant to TDC's Certificate of Incorporation, as amended.

          1.7  "Proprietary Rights" shall mean data, inventions, information,
processes, know-how and trade secrets, and patents or patent applications
covering any of the foregoing, owned by or licensed to a person and which such
person has the right to license.  Proprietary rights shall not include
trademarks.

          1.8  "Technology License Agreement" shall mean the Technology License
Agreement dated as of the date hereof between ALZA and TDC.

    2.    LICENSE OPTION.

          2.1  GRANT OF LICENSE OPTION.  On the terms and subject to the 
conditions of this Agreement, TDC hereby grants to ALZA a License Option with 
respect to each Product, exercisable on a Product by Product and 
country-by-country basis as described in Section 2.2.  ALZA agrees that, as 
long as TDC has Proprietary

                                       -2-

<PAGE>

Rights in a Product, ALZA will not commercialize any Product, for its own
account or with a third party, except pursuant to a License Agreement executed
pursuant to the terms hereof.

          2.2  TIME FOR EXERCISE.  ALZA may exercise the License option with 
respect to any Product on a country-by-country basis at any time during the 
period beginning on the date hereof and ending 90 days after written 
notification to ALZA of the earlier of (i) approval to market such Product in 
such country by the appropriate regulatory agency or (ii) approval to market 
the Product in the United States by the FDA. The License Option for any 
Product in any country automatically will expire if not exercised within the 
time periods described above.  TDC will notify ALZA in writing within 10 
business days of receipt of each approval to market any Product in any 
country.

          2.3  MANNER OF EXERCISE.  ALZA shall exercise its License Option by 
delivering to TDC, within the time period described in Section 2.2 above, a 
notice of exercise specifying the Product and the country or countries as to 
which the License Option is exercised.  A License Agreement for such Product 
shall be deemed to be effective in such country or countries as of the date 
of such notice of exercise, without the necessity of any additional action by 
the parties.  For the convenience of the parties, however, TDC shall, upon 
receipt of ALZA's notice, forward to ALZA two executed copies of a License 
Agreement dated the effective date and containing completed Attachments A and 
B; ALZA shall execute both copies and return one to TDC as soon as possible.  
Failure of either or both of the parties to execute

                                       -3-

<PAGE>

such License Agreement shall not, however, affect the effectiveness of the 
license granted thereby.  The parties shall enter into a separate License 
Agreement for each Product as to which ALZA elects to exercise a License 
Option. For convenience, the parties shall amend Attachment B to a License 
Agreement to add countries in cases where a License Option is being exercised 
for a Product for which a License Option already has been exercised in 
another country or countries.

     3.   NO CONFLICT.

          TDC agrees that no license, sale or other commercial exploitation of
any Product has been or shall be made or offered to any person or entity on any
basis that is or will be in conflict with this Agreement or any License
Agreement.

     4.   ACCESS TO INFORMATION.

          4.1  INFORMATION AVAILABLE.  TDC shall make available to ALZA, at 
all reasonable times, all available information relating to all Products, so 
as to enable ALZA to determine whether and when to exercise its License 
Option.

          4.2  CONSULTATION. TDC shall consult with ALZA and inform ALZA on a 
continuing basis of development and the current state of all Products and 
will review from time to time with ALZA the progress towards completion of 
the Products.

     5.   TERMINATION.

     This Agreement shall terminate on the earlier of (a) the date of expiration
of the License Option for all of the Products and (b) 90 days after expiration
of the Purchase Option.


                                       -4-
<PAGE>

     6.   MISCELLANEOUS.

          6.1  AMENDMENT. Any waiver by either party hereto of a breach of 
any provisions of this Agreement shall not be implied and shall not be valid 
unless such waiver is recited in writing and signed by such party.  Failure 
of any party to require, in one or more instances, performance by the other 
party in strict accordance with the terms and conditions of this Agreement 
shall not be deemed a waiver or relinquishment of the future performance of 
any such terms or conditions or of any other terms and conditions of this 
Agreement.  A waiver by either party of any term or condition of this 
Agreement shall not be deemed or construed to be a waiver of such term or 
condition for any other term.  All rights, remedies, undertakings, 
obligations and agreements contained in this Agreement shall be cumulative 
and none of them shall be a limitation of any other remedy, right, 
undertaking, obligation or agreement of either party.  This Agreement may not 
be amended except in a writing signed by both parties.

     6.2  ASSIGNMENT.  Neither party may assign its rights and obligations 
hereunder without the prior written consent of the other party, which consent 
may not be unreasonably withheld; provided, however, that ALZA may assign 
such rights and obligations hereunder to any person or entity with which ALZA 
is merged or consolidated or which purchases all or substantially all of the 
assets of ALZA.

                                       -5-
<PAGE>

     6.3  ARBITRATION.

          6.3.1 ARBITRATION.  All disputes which may arise under, out of or 
in connection with this Agreement shall be settled by arbitration conducted 
in the City of San Francisco, State of California, in accordance with the 
then existing rules of the American Arbitration Association, and judgment 
upon the award rendered by the arbitrators may be entered in any court having 
jurisdiction thereof. The parties hereby agree that service of any notices in 
the course of such arbitration at their respective addresses as provided for 
in Section 6.7 of this Agreement shall be valid and sufficient.

          6.3.2 ARBITRATORS. In any arbitration pursuant to this Section 6.3, 
the award shall be rendered by a majority of the members of a board of 
arbitration consisting of three members who shall be appointed by the parties 
jointly, or if the parties cannot agree as to three arbitrators within 30 
days after the commencement of the arbitration proceeding, then one 
arbitrator shall be appointed by ALZA and one arbitrator shall be appointed 
by TDC within 60 days after the commencement of the arbitration proceeding.  
The third arbitrator shall be appointed by mutual agreement of such two 
arbitrators.  In the event of failure of the two arbitrators to agree within 
75 days after commencement of the arbitration proceeding upon the appointment 
of the third arbitrator, the third arbitrator shall be appointed by the 
American Arbitration Association in accordance with its then existing rules.  
Notwithstanding the foregoing, in the event that any party shall fail to 
appoint an arbitrator it is required to

                                       -6-
<PAGE>

appoint within the specified time period, such arbitrator and the third 
arbitrator shall be appointed by the American Arbitration Association in 
accordance with its then existing rules.  For purposes of this Section 6.3, 
the "commencement of the arbitration proceeding" shall be deemed to be the 
date upon which a written demand for arbitration is received by the American 
Arbitration Association from one of the parties.

     6.4  COUNTERPARTS.  This Agreement may be executed in any number of 
counterparts, each of which when so executed shall be deemed to be an 
original and all of which when taken together shall constitute this Agreement.

     6.5  GOVERNING LAW.  This Agreement shall be governed by and construed 
in accordance with the laws of the state of California as applied to 
residents of that state entering into contracts wholly to be performed in 
that state.

     6.6  HEADINGS.  The section headings contained in this Agreement are 
included for convenience only and form no part of the Agreement between the 
parties.

     6.7  NOTICES.  Notices required under this Agreement shall be in writing 
and sent by registered or certified mail, postage prepaid, or by telex or 
facsimile and confirmed by registered or certified mail and addressed as 
follows:

     If to ALZA:    ALZA Corporation
                    950 Page Mill Road
                    P. 0. Box 10950
                    Palo Alto, CA 94303-0802 
                    Attention: Vice President, Legal


                                       -7-

<PAGE>


     If to TDC:     Therapeutic Discovery Corporation 
                    1290 Page Mill Road
                    P.O. Box 10051
                    Palo Alto, CA 94303-0860 
                    Attention: Chief Executive Officer

All notices shall be deemed to be effective five days after the date of 
mailing or upon receipt if sent by telex or facsimile (but only if followed 
by certified or registered confirmation).  Either party may change the 
address at which notice is to be received by written notice pursuant to this 
Section 6.7.

          6.8  PUBLIC DISCLOSURE.  Neither party shall disclose to third 
parties, nor originate any publicity, news release or public announcement, 
written or oral, whether to the public, the press, stockholders or otherwise, 
referring to the existence or terms of this Agreement, including its 
existence, the subject matter to which it relates, the performance under it 
or any of its specific terms and conditions, except such announcements, as in 
the opinion of the counsel for the party making such announcement, are 
required by law, including United States securities laws, rules or 
regulations, without the prior written consent of the other party.  If a 
party decides to make an announcement it believes to be required by law with 
respect to this Agreement, it will give the other party such notice as is 
reasonably practicable and an opportunity to comment upon the announcement.

          6.9  SEVERABILITY.  If any provision of this Agreement is held by a 
court of competent jurisdiction to be invalid or unenforceable, it shall be 
modified, if possible, to the minimum extent necessary to make it valid and 
enforceable or, if such

                                       -8-
<PAGE>

modification is not possible, it shall be stricken and the remaining 
provisions shall remain in full force and effect; provided, however, that if 
a provision is stricken so as to significantly alter the economic 
arrangements of this Agreement, the party adversely affected may terminate 
this Agreement upon 60 days' prior written notice to the other party.

          6.10 RELATIONSHIP OF THE PARTIES.  For all purposes of this 
Agreement, TDC and ALZA shall be deemed to be independent entities and 
anything in this Agreement to the contrary notwithstanding, nothing herein 
shall be deemed to constitute TDC and ALZA as partners, joint venturers, 
co-owners, an association or any entity separate and apart from each party 
itself, nor shall this Agreement constitute any party hereto an employee or 
agent, legal or otherwise, of the other party for any purposes whatsoever.  
Neither party hereto is authorized to make any statements or representations 
on behalf of the other party or in any way obligate the other party, except 
as expressly authorized in writing by the other party.  Anything in this 
Agreement to the contrary notwithstanding, no party hereto shall assume nor 
shall be liable for any liabilities or obligations of the other party, 
whether past, present or future.

                                       -9-
<PAGE>


          IN WITNESS WHEREOF, the parties have executed this Agreement as of 
the date first above written.

                                    ALZA CORPORATION

                                    By: /s/ Jane E. Shaw
                                       -----------------------------------------

                                    Title: President and Chief Operating Officer
                                          --------------------------------------


                                    THERAPEUTIC DISCOVERY CORPORATION

                                    By: /s/ Pieter P. Bonsen
                                       -----------------------------------------

                                    Title: President
                                          --------------------------------------


                                       -10-

<PAGE>


                                     EXHIBIT A

                                 LICENSE AGREEMENT

     This LICENSE AGREEMENT is made this ____ day of _______________ , 
19__, by and between ALZA Corporation, a Delaware corporation ("ALZA"), and 
Therapeutic Discovery Corporation ("TDC"), a Delaware corporation.

                                     RECITALS

     A.   TDC and ALZA have entered into a License Option Agreement and certain
other agreements dated as of March 10, 1993.

     B.   Section 2 of the License Option Agreement provides for a license, the
terms of which are to be set forth herein.

     NOW, THEREFORE, the parties agree as follows:

     l.   DEFINITIONS.

          For purposes of this Agreement, the following terms will have the
respective meanings set forth below.

          1.1  "Affiliate" shall mean a corporation or any other entity that
directly, or indirectly through one or more intermediaries, controls, is
controlled by, or is under common control with, the designated party.  "Control"
shall mean ownership of at least 50% of the shares of stock entitled to vote for
the election of directors in the case of a corporation, and at least 50% of the
interests in profits in the case of a business entity other than a corporation.

          1.2 "Developed Technology" shall mean Proprietary Rights that (a) are
generated, developed, conceived or first

<PAGE>

reduced to practice, as the case may be, by ALZA or others under a product
development program undertaken pursuant to the Development Contract or (b) are
in any manner acquired by or otherwise obtained on behalf of TDC from persons
other than ALZA and are necessary or useful to the development of the Licensed
Product during the term of the Development Contract.

          1.3  "Development Contract" shall mean the Development Agreement
between the parties dated as of March 10, 1993.

          1.4  "Development Cost(s)" shall mean the cost of the activities
undertaken pursuant to the Development Contract with respect to the Licensed
Product, determined in accordance with Exhibit A thereto.

          1.5  "Infringing Product" shall mean any product sold by a third
party, other than pursuant to a sublicense or distribution agreement with TDC or
ALZA, which consists of the drug compound or compounds incorporated in the
Licensed Product as the active agent or agents and a delivery system
substantially similar to that incorporated in the Licensed Product, and which
product infringes or is alleged to infringe any ALZA patent or patents covering
the Licensed Product.

          1.6  "License Option Agreement" shall mean the License Option
Agreement between the parties dated as of March 10, 1993.

          1.7  "Licensed Product" shall mean the product listed on Exhibit A
hereto.

          1.8  "Major Market Country" shall mean any of the United States, the
United Kingdom, France, Germany, Italy or Japan.

                                       -2-
<PAGE>


          1.9  "Net Sales" shall mean the total amount invoiced in United States
dollars (or converted thereto in accordance with section 5.2) on sales by ALZA
and its Affiliates to independent, unrelated third parties (other than
distributors or sublicensees who make payments that constitute Sublicensing
Revenues) in bona fide arms' length transactions, less the following deductions,
in each case related specifically to the product in question and actually
allowed and taken by such third parties and not otherwise recovered by or
reimbursed to ALZA or its Affiliates: (i) trade, cash and quantity discounts;
(ii) taxes on sales (such as sales or use taxes) to the extent added to the
sales price and set forth separately as such in the total amount invoiced; (iii)
freight, insurance and other transportation charges to the extent added to the
sales price and set forth separately as such in the total amount invoiced; and
(iv) amounts repaid or credited by reason of rejections, defects or returns or
because of retroactive price reductions, or due to government laws or
regulations requiring rebates.  Net Sales shall not include sales between or
among ALZA and its Affiliates or Sublicensing Revenues.

          1.10 "Proprietary Rights" shall mean data, inventions, information,
processes, know-how and trade secrets, and patents or patent applications
covering any of the foregoing, owned by or licensed to a person and which such
person has the right to license.  Proprietary Rights shall not include
trademarks.

          1.11 "Special Royalty Payments" shall mean "front-end" distribution
fees, prepaid royalties and similar one-time,


                                       -3-
<PAGE>


infrequent or special payments.  Solely for purposes of calculating a buy-out
price under Section 3.3 hereof, any Special Royalty Payments will be amortized
over a period of 28 calendar quarters, beginning with the quarter in which such
payment is made.

          1.12 "Sublicensing Revenues" shall mean (a) any royalties or
percentage of sales payments received by ALZA or any Affiliate under either (i)
any sublicense for the manufacture, use or sale of the product in question or
(ii) any distribution agreement entered into with a distributor who agrees to
pay royalties or make percentage of sales payments to ALZA or any Affiliate in
respect of the manufacture, use or sale of such product and (b) any Special
Royalty Payments received by ALZA or its Affiliates in respect of such product,
in each case excluding amounts paid to reimburse ALZA for research and
development or manufacturing costs.

          1.13 "Territory" shall mean the country or countries listed on Exhibit
B hereto, as amended from time to time by the parties in connection with the
exercise by ALZA of its option for additional countries under the License Option
Agreement.

     2.   GRANT OF LICENSE.

          TDC hereby grants to ALZA the exclusive, perpetual, right and license
in the Territory to develop, make, have made, use and sell the Licensed Product.
ALZA (at no cost to TDC) agrees to use its reasonable efforts to complete or
have completed any remaining activities necessary to complete the development of
the Licensed Product in the Territory and to


                                       -4-
<PAGE>

promote the commercialization of the Licensed Product in each Major Market
Country of the Territory through the manufacture and sale or the sublicensing of
the Licensed Product.  ALZA may use reasonable discretion in the allocation of
its technological and monetary resources in performing its obligations
hereunder, taking into account not only the Licensed Product but also activities
for its own account and its obligations under third party agreements.

     3.   ROYALTIES AND OTHER PAYMENTS.

          3.1  PAYMENTS.  In consideration of the grant of the license, ALZA 
shall pay TDC royalties with respect to the Licensed Product as follows:

               (a)  up to a maximum of 5% of Net Sales of the Licensed Product
in the Territory determined as follows: 1% of such Net Sales, plus an additional
0.1% of such Net Sales for each full one million dollars of Development Costs of
the Licensed Product paid by TDC; plus

               (b)  up to a maximum of 50% of Sublicensing Revenues in respect
of sales of the Licensed Product in the Territory determined as follows: 10% of
such Sublicensing Revenues, plus an additional 1% of such Sublicensing Revenues
for each full one million dollars of Development Costs of the Licensed Product
paid by TDC.

          In determining payments due under this Section 3.1, Net Sales and
Sublicensing Revenues shall be reduced by the dollar amount of any license or
similar payments made to third parties


                                       -5-

<PAGE>

by ALZA or its Affiliates with respect to sales of such Licensed Product in the
Territory. In determining payments under this Section 3.1, Development Costs
shall be determined as of December 31 of each calendar year, in order to
determine the rates payable for the next calendar year for all countries
included in the Territory as of January 1 of such next year, and for any country
added to the Territory during such next year.

          3.2  TERM OF PAYMENTS.  The obligation to make payments hereunder 
shall continue for 15 years after the date of the first commercial 
introduction of the Licensed Product in any Major Market Country.

          3.3  BUY-OUT OF PAYMENTS.  ALZA shall have the option, in its 
discretion, at any time from and after the end of the twelfth calendar 
quarter following the quarter in which the first commercial sale in any 
country of the Licensed Product occurs, to buy out its remaining obligations 
to make payments under Section 3.1 with respect to sales of such Licensed 
Product in such country.  The buy-out price shall be an amount equal to 15 
times the payments made by or due to TDC from ALZA under Section 3.1 with 
respect to sales of such Licensed Product in such country during the four 
most recent calendar quarters preceding the date of exercise of the buy-out 
option for which royalties were paid or were due in respect of such country.  
ALZA shall have the option, in its discretion, at any time from and after the 
end of the twelfth calendar quarter following the quarter in which the first 
commercial sale of any Licensed Product occurs in either the United States or 
two other Major

                                       -6-
<PAGE>

Market Countries to buy out its remaining worldwide obligations to make payments
under Section 3.1 with respect to such Licensed Product.  The buy-out price
shall be an amount equal to 20 times the payments made by or due to TDC from
ALZA under Section 3.1 on a worldwide basis with respect to such Licensed
Product during the four most recent calendar quarters preceding the date of
exercise of the buy-out option for which royalties were paid or were due (and,
in addition, such payments as would have been paid by or due from ALZA to TDC if
ALZA had not exercised any country specific buy-out option with respect to such
Licensed Product less any amounts previously paid to exercise any country-
specific buy-out option with respect to such Licensed Product.  For calculating
the buy-out price, any Special Royalty Payments will be amortized over a period
of 28 quarters, beginning with the quarter in which such payment is made.

     4.   ACCOUNTING.

          4.1  REPORTS.  Within 90 days after the end of each calendar 
quarter for which royalties are due under Section 3.1, ALZA shall render an 
accounting to TDC, on a country-by-country basis, with respect to all 
payments due for such quarter under Section 3.1. Such report shall indicate 
for such quarter, the quantity and dollar amount of sales of the Licensed 
Product by ALZA, its Affiliates, sublicensees and distributors with respect 
to which such payments are due; provided, however, that if ALZA shall not 
have received from any foreign sublicensee or distributor a report of its 
sales for any quarter, then such sales shall be included in the next 
quarterly report.  In case no

                                       -7-

<PAGE>


payment is due for any calendar quarter, ALZA shall so report.  ALZA shall keep
accurate records in sufficient detail to enable the payments due hereunder to be
determined.

          4.2  REVIEW BY ACCOUNTANTS. At TDC's request, ALZA shall permit an 
independent public accountant selected by TDC to have access, once in each 
calendar year during regular business hours and upon reasonable notice to 
ALZA, to such of the records of ALZA as may be necessary to verify the 
accuracy of the reports and payments made under this Agreement, but said 
accountant shall not disclose to TDC any information except that which should 
properly have been contained in such reports.  The right of review with 
respect to any quarterly account shall terminate two years after TDC's 
receipt of the royalties due with respect to such quarter.

     5.   TIMES AND CURRENCIES OF PAYMENTS.

          5.1  PAYMENTS.  Payments shown by each calendar quarter report to 
have accrued shall be due and payable on the date such report is due and 
shall be paid in United States dollars.  Any and all taxes due or payable on 
such payments or with respect to the remittance thereof shall be deducted 
from such payments and shall be paid by ALZA to the proper taxing 
authorities, and proof of payment shall be secured and sent to TDC as 
evidence of such payment.  The rate of exchange to be used in computing the 
amount of the United States dollars due to TDC in satisfaction of payment 
obligations with respect to sales in foreign countries shall be calculated by 
converting the amount due in such foreign currency into United States dollars 
based on the rate for the

                                       -8-
<PAGE>

purchase of United States dollars with such currency as published in the WALL 
STREET JOURNAL on the last business day of the calendar quarter for which 
payment is being made.

          5.2  CERTAIN FOREIGN PAYMENTS.  If governmental regulations prevent 
remittance from any foreign country of any amounts due under Section 3.1 in 
respect of that country, ALZA shall so notify TDC in writing, and the 
obligation under this Agreement to make payments in respect of sales in that 
country shall be suspended (but the amounts due but not paid shall continue 
to accrue) until such remittances are possible.  TDC shall have the right, 
upon written notice to ALZA, to receive payment in any such country in the 
local currency.

          5.3  LATE PAYMENTS.  Any payments due hereunder that are not made 
when due shall bear interest at the lesser of ten percent per annum or the 
maximum rate as may be allowed by law, beginning on the date when TDC has 
notified ALZA that such payments are overdue.

     6    PATENTS.

          6.1  PATENT INFRINGEMENT.

               (a)  If a third party infringes, by the manufacture or sale of an
Infringing Product, any patent covering the Licensed Product, ALZA may, at its
own expense and with the right to all recoveries, bring legal action to restrain
such infringement and for damages.  If ALZA fails to take the necessary steps to
restrain such infringement by litigation or otherwise, and if such Infringing
Product achieves a sales volume in the country of infringement equal to 25% of
the sales volume

                                       -9-
<PAGE>

of the Licensed Product sold by ALZA and its Affiliates, sublicensees and
distributors in such country, then TDC may institute, in its own name, at its
own expense and with the right to all recoveries, such litigation or other
appropriate action as it may deem necessary to terminate such infringement,
provided that TDC has first given to ALZA 60 days advance notice of its
intention to take such action and provided further, that ALZA has not itself
taken appropriate action during such 60 day period.

               (b)  If TDC desires to bring such action in accordance with this
Section 6.1, ALZA agrees to cooperate with TDC.  TDC shall indemnify ALZA
against liability for any costs, damages or other amounts awarded to the third
party.  If the third party in any such action brings a counteraction for
invalidation or misuse of a patent covering the Licensed Product, TDC promptly
shall notify ALZA and ALZA may, within six months of the notification, join and
participate in such action at its own expense.

               (c)  Each party agrees not to settle any action it brings in a
manner that is prejudicial to any patent or proprietary rights of the other
party without the other party's prior written approval.

     7.   EFFECTIVE DATE AND TERM.

          This Agreement will become effective in accordance with Section 2.3 
of the License Option Agreement and, unless terminated in accordance with any 
of the provisions hereof, shall remain in full force and effect thereafter; 
provided, however,

                                       -l0-
<PAGE>


that the obligation to make payments under Section 3 hereof shall terminate as
set forth in Section 3.

     8.   DISCLAIMERS.

     TDC DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY (i) THAT THE LICENSED PRODUCT
OR ANY TECHNOLOGY INCORPORATED THEREIN WILL BE FREE FROM CLAIMS OF PATENT
INFRINGEMENT, INTERFERENCE OR UNLAWFUL USE OF PROPRIETARY INFORMATION OF ANY
THIRD PARTY AND (ii) OF THE ACCURACY, RELIABILITY, TECHNOLOGICAL OR COMMERCIAL
VALUE, COMPREHENSIVENESS OR MERCHANTABILITY OF THE LICENSED PRODUCT OR ANY
TECHNOLOGY INCORPORATED THEREIN OR THEIR SUITABILITY OR FITNESS FOR ANY PURPOSE
WHATSOEVER INCLUDING, WITHOUT LIMITATION, THE DESIGN, DEVELOPMENT, MANUFACTURE,
USE OR SALE OF THE LICENSED PRODUCT.  TDC DISCLAIMS ALL OTHER WARRANTIES OF
WHATEVER NATURE, EXPRESS OR IMPLIED.

     9.   TERMINATION.

          9.1  TERMINATION BY TDC.  TDC may, in its discretion, terminate 
this Agreement in the event that ALZA:

               (a)  breaches any material obligation hereunder and such breach
continues for a period of 60 days after written notice thereof; or

               (b)  enters into any proceeding, whether voluntary or otherwise,
in bankruptcy, reorganization or arrangement for the appointment of a receiver
or trustee to take possession of ALZA's assets or any other proceedings under
any law for the relief of creditors or makes an assignment for the benefit of
its creditors.


                                       -11-
<PAGE>

          9.2  TERMINATION BY ALZA.  ALZA may terminate this Agreement with 
respect to one or more countries included in the Territory upon thirty days' 
prior written notice to TDC if ALZA elects for any reason to discontinue 
commercialization of the Licensed Product.

          9.3  CONSEQUENCES OF TERMINATION.  Termination of this Agreement 
for any reason in accordance with the terms hereof shall be without prejudice 
to:

               (a)  TDC's right to receive all payments accrued under Section 3
prior to the effective date of such termination; and

               (b)  any other remedies which either party may then or thereafter
have hereunder or otherwise.

If this Agreement terminates pursuant to this Section 9, ALZA shall discontinue
production and sales of the Licensed Product.  In the event of any termination
under this Section 9, ALZA may sell its inventory in stock on the date of
termination and shall remit payments to TDC in respect thereto in accordance
with this Agreement.

     10.  MISCELLANEOUS.

          10.1 AMENDMENT.  Any waiver by either party hereto of a breach of 
any provisions of this Agreement shall not be implied and shall not be valid 
unless such waiver is recited in writing and signed by such party. Failure of 
any party to require, in one or more instances, performance by the other 
party in strict accordance with the terms and conditions of this Agreement 
shall not be deemed a waiver or relinquishment of the future

                                       -12-
<PAGE>

performance of any such terms or conditions or of any other terms and conditions
of this Agreement.  A waiver by either party of any term or condition of this
Agreement shall not be deemed or construed to be a waiver of such term or
condition for any other term.  All rights, remedies, undertakings, obligations
and agreements contained in this Agreement shall be cumulative and none of them
shall be a limitation of any other remedy, right, undertaking, obligation or
agreement of either party.  This Agreement may not be amended except in a
writing signed by both parties.

          10.2 ASSIGNMENT.  Neither party may assign its rights and 
obligations hereunder without the prior written consent of the other party, 
which consent may not be unreasonably withheld; provided, however, that ALZA 
may assign such rights and obligations hereunder to any person or entity with 
which ALZA is merged or consolidated or which purchases all or substantially 
all of the assets of ALZA.

          10.3 ARBITRATION.

               10.3.1 ARBITRATION.  All disputes which may arise under, out 
of or in connection with this Agreement shall be settled by arbitration 
conducted in the City of San Francisco, State of California, in accordance 
with the then existing rules of the American Arbitration Association, and 
judgment upon the award rendered by the arbitrators may be entered in any 
court having jurisdiction thereof.  The parties hereby agree that service of 
any notices in the course of such arbitration at their

                                       -13-
<PAGE>

respective addresses as provided for in Section 10.7 of this Agreement shall be
valid and sufficient.

               10.3.2 ARBITRATORS.  In any arbitration pursuant to this 
Section 10.3, the award shall be rendered by a majority of the members of a 
board of arbitration consisting of three members who shall be appointed by 
the parties jointly, or if the parties cannot agree as to three arbitrators 
within 30 days after the commencement of the arbitration proceeding, then one 
arbitrator shall be appointed by ALZA and one arbitrator shall be appointed 
by TDC within 60 days after the commencement of the arbitration proceeding.  
The third arbitrator shall be appointed by mutual agreement of such two 
arbitrators.  In the event of failure of the two arbitrators to agree within 
75 days after commencement of the arbitration proceeding upon the appointment 
of the third arbitrator, the third arbitrator shall be appointed by the 
American Arbitration Association in accordance with its then existing rules.  
Notwithstanding the foregoing, in the event that any party shall fail to 
appoint an arbitrator it is required to appoint within the specified time 
period, such arbitrator and the third arbitrator shall be appointed by the 
American Arbitration Association in accordance with its then existing rules.  
For purposes of this Section 10.3, the "commencement of the arbitration 
proceeding" shall be deemed to be the date upon which a written demand for 
arbitration is received by the American Arbitration Association from one of 
the parties.

          10.4 COUNTERPARTS. This Agreement may be executed in any number of 
counterparts, each of which when so executed shall

                                       -14-

<PAGE>

be deemed to be an original and all of which when taken together shall
constitute this Agreement.

          10.5 GOVERNING LAW.  This Agreement shall be governed by the laws 
of the state of California as applied to residents of that state entering 
into contracts to be performed in that state.

          10.6 HEADINGS.  The headings set forth at the beginning of the 
various sections of this Agreement are for reference and convenience and 
shall not affect the meanings of the provisions of this Agreement.

          10.7 NOTICES.  Notices required under this Agreement shall be in 
writing and sent by registered or certified mail, postage prepaid, or by 
telex or facsimile and confirmed by registered or certified mail and 
addressed as follows:

          If to ALZA:         ALZA Corporation 
                              950 Page Mill Road 
                              P. 0. Box 10950 
                              Palo Alto, CA  94303-0802
                              Attention:  Vice President, Legal

          If to TDC:          Therapeutic Discovery Corporation 
                              1290 Page Mill Road
                              P.O. Box 10051
                              Palo Alto, CA  94303-0860 
                              Attention:  Chief Executive Officer

All notices shall be deemed to be effective five days after the date of mailing
or upon receipt if sent by telex or facsimile (but only if followed by certified
or registered confirmation).  Either party may change the address at which
notice is to be received by written notice pursuant to this Section 10.7.

          10.8 PUBLIC DISCLOSURE.  Neither party shall disclose to third 
parties, nor originate any publicity, news release or public announcement, 
written or oral, whether to the public, the

                                       -15-

<PAGE>

press, stockholders or otherwise, referring to the existence or terms of this
Agreement, the subject matter to which it relates, the performance under it or
any of its specific terms and conditions, except such announcements, as in the
opinion of the counsel for the party making such announcement, are required by
law, including United States securities laws, rules or regulations, without the
prior written consent of the other party.  If a party decides to make an
announcement it believes to be required by law with respect to this Agreement,
it will give the other party such notice as is reasonably practicable and an
opportunity to comment upon the announcement.

          10.9 SEVERABILITY.  If any provision of this Agreement is held by a 
court of competent jurisdiction to be invalid or unenforceable, it shall be 
modified, if possible, to the minimum extent necessary to make it valid and 
enforceable or, if such modification is not possible, it shall be stricken 
and the remaining provisions shall remain in full force and effect; provided, 
however, that if a provision is stricken so as to significantly alter the 
economic arrangements of this Agreement, the party adversely affected may 
terminate this Agreement upon 60 days' prior written notice to the other 
party.

          10.10 RELATIONSHIP OF THE PARTIES.  For all purposes of this 
Agreement, TDC and ALZA shall be deemed to be independent contractors and 
anything in this Agreement to the contrary notwithstanding, nothing herein 
shall be deemed to constitute TDC and ALZA as partners, joint venturers, 
co-owners, an association or any entity separate and apart from each party 
itself, nor

                                       -16-
<PAGE>

shall this Agreement constitute any party hereto an employee or agent, legal 
or otherwise, of the other party for any purposes whatsoever.  Neither party 
hereto is authorized to make any statements or representations on behalf of 
the other party or in any way obligate the other party, except as expressly 
authorized in writing by the other party. Anything in this Agreement to the 
contrary notwithstanding, no party hereto shall assume nor shall be liable 
for any liabilities or obligations of the other party, whether past, present 
or future.

          10.11 SURVIVAL.  The provisions of Sections 1, 3, 4, 5, 6, 8, 9, 
10.3, 10.5, 10.7, 10.8, 10.9, 10.10, and this Section 10.11 shall survive the 
termination for any reason of this Agreement.  Neither party shall be liable 
to the other due to the termination of this Agreement as provided herein, 
whether in loss of good will, anticipated profits or otherwise.  Any payments 
due under this Agreement with respect to any period prior to its termination 
shall be made notwithstanding the termination of this Agreement.

                                       -17-

<PAGE>

     IN WITNESS WHEREOF, the parties have executed this Agreement on the date
first set forth above.

                                       ALZA CORPORATION


                                       By:
                                          ------------------------------

                                       Title:
                                             ---------------------------


                                       THERAPEUTIC DISCOVERY CORPORATION


                                       By:
                                          ------------------------------

                                       Title:
                                             ---------------------------


                                       -18-
<PAGE>


                                     EXHIBIT A

                                  LICENSED PRODUCT

<PAGE>

                                     EXHIBIT B

                                     TERRITORY


<PAGE>

                                   SERVICES AGREEMENT


     This Services Agreement is made as of the 10th day of March, 1993 between
ALZA Corporation ("ALZA") and Therapeutic Discovery Corporation ("TDC").

                                       RECITALS

     TDC desires that ALZA provide certain services to TDC and ALZA desires to
provide such services, on the terms and conditions set forth herein.

     NOW THEREFORE THE PARTIES AGREE AS FOLLOWS:

     1.   SERVICES.

     Upon request, ALZA will supply TDC with one or several of the following
services: accounting, legal, stockholder relations and similar management and
administrative services as mutually agreed. Such services will be provided at
reasonable times and upon reasonable notice, as mutually agreed.

     2.   COMPENSATION.

          TDC shall pay ALZA's Costs in providing such services, monthly in
arrears within 30 days of the date of the invoice received by TDC from ALZA. 
ALZA's "Costs" shall include reimbursement for its direct expenses associated
with the Distribution of Units covered by the Information Statement dated March
10, 1993, and ALZA's direct and indirect expenses as defined in Schedule A
hereto, and the cost of assets purchased for use solely on behalf of TDC, the
purchase of which is approved by TDC.

<PAGE>

     3.   TERM AND TERMINATION.

          The initial term of this Agreement shall commence on the date hereof
and shall terminate on December 31, 1993, unless renewed as provided herein. 
Thereafter, this Agreement shall automatically be renewed for successive terms
of one year each unless written notice of termination is given by the
terminating party to the other party at least 30 days in advance of the
expiration of any term; provided, however, that in no event shall the renewal
term extend past the date that is 180 days after the expiration of the Purchase
Option granted to ALZA pursuant to TDC's Certificate of Incorporation.  TDC may,
in its discretion, terminate this Agreement at any time upon 60 days' written
notice to ALZA.  Either party may, in its discretion, terminate this Agreement
by written notice to the other party in the event that the other party (a)
breaches any materials obligation hereunder or under the Technology License
Agreement, the Development Agreement, or the License Option Agreement between
ALZA and TDC, or any license granted to ALZA under the License Option Agreement,
which breach continues for a period of 60 days after written notice thereof, or
(b) enters into any proceeding, whether voluntary or involuntary, in bankruptcy,
reorganization or arrangement for the appointment of a receiver or trustee to
take possession of such party's assets or any other proceeding under any law for
the relief of creditors, or makes an assignment for the benefit of its
creditors.


                                       -2-
<PAGE>

     4.   INDEMNIFICATION OF ALZA.

          TDC hereby agrees to indemnify, protect and hold ALZA harmless from 
any and all liabilities, costs or expenses incurred by ALZA as a result of 
services rendered by it under this Agreement, including, without limitation, 
lawsuits of and claims by third parties, except for liabilities, costs or 
expenses resulting from ALZA's gross negligence or willful misconduct.

     5.   FORCE MAJEURE.

          ALZA shall not be liable for delay in performance of any of its 
obligations hereunder if such delay is due to causes beyond its reasonable 
control including, without limitation, acts of God, fires, strikes, acts of 
war, or intervention of any government or authority, but any such delay or 
failure shall be remedied by ALZA as soon as possible.

     6.   MISCELLANEOUS.

          6.1  AMENDMENT.  Any waiver by either party hereto of a breach of 
any provisions of this Agreement shall not be implied and shall not be valid 
unless such waiver is recited in writing and signed by such party.  Failure 
of any party to require, in one or more instances, performance by the other 
party in strict accordance with the terms and conditions of this Agreement 
shall not be deemed a waiver or relinquishment of the future performance of 
any such terms or conditions or of any other terms and conditions of this 
Agreement. A waiver by either party of any term or condition of this 
Agreement shall not be deemed or construed to be a waiver of such term or 
condition for any other term.  All rights, remedies, undertakings, obligations 
and

                                       -3-

<PAGE>

agreements contained in this Agreement shall be cumulative and none of them
shall be a limitation of any other remedy, right, undertaking, obligation or
agreement of either party.  This Agreement may not be amended except in a
writing signed by both parties.

          6.2  ASSIGNMENT.  Neither party may assign its rights and 
obligations hereunder without the prior written consent of the other party, 
which consent may not be unreasonably withheld; provided, however, that ALZA 
may assign such rights and obligations hereunder to any person or entity with 
which ALZA is merged or consolidated or which purchases all or substantially 
all of the assets of ALZA.  ALZA may subcontract all or any portion of its 
duties hereunder to third parties, in its sole discretion.

          6.3. ARBITRATION.

               6.3.1 ARBITRATION.  All disputes which may arise under, out of 
or in connection with this Agreement shall be settled by arbitration 
conducted in the City of San Francisco, State of California, in accordance 
with the then existing rules of the American Arbitration Association, and 
judgment upon the award rendered by the arbitrators may be entered in any 
court having jurisdiction thereof.  The parties hereby agree that service of 
any notices in the course of such arbitration at their respective addresses 
as provided for in Section 6.7 of this Agreement shall be valid and 
sufficient.

               6.3.2 ARBITRATORS.  In any arbitration pursuant to this 
Section 6.3, the award shall be rendered by a majority of

                                       -4-
<PAGE>

the members of a board of arbitration consisting of three members who shall be
appointed by the parties jointly, or if the parties cannot agree as to three
arbitrators within 30 days after the commencement of the arbitration proceeding,
then one arbitrator shall be appointed by ALZA and one arbitrator shall be
appointed by TDC within 60 days after the commencement of the arbitration
proceeding.  The third arbitrator shall be appointed by mutual agreement of such
two arbitrators.  In the event of failure of the two arbitrators to agree within
75 days after commencement of the arbitration proceeding upon the appointment of
the third arbitrator, the third arbitrator shall be appointed by the American
Arbitration Association in accordance with its then existing rules. 
Notwithstanding the foregoing, in the event that any party shall fail to appoint
an arbitrator it is required to appoint within the specified time period, such
arbitrator and the third arbitrator shall be appointed by the American
Arbitration Association in accordance with its then existing rules.  For
purposes of this Section 6.3, the "commencement of the arbitration proceeding"
shall be deemed to be the date upon which a written demand for arbitration is
received by the American Arbitration Association from one of the parties.

          6.4  COUNTERPARTS.  This Agreement may be executed in any number of 
counterparts, each of which when so executed shall be deemed to be an 
original and all of which when taken together shall constitute this Agreement.

                                       -5-
<PAGE>

          6.5  GOVERNING LAW. This Agreement shall be governed by the laws of 
the state of California as applied to residents of that state entering into 
contracts to be performed in that state.

          6.6  HEADINGS.  The headings set forth at the beginning of the 
various sections of this Agreement are for reference and convenience and 
shall not affect the meanings of the provisions of this Agreement.

          6.7  NOTICES.  Notices required under this Agreement shall be in 
writing and sent by registered or certified mail, postage prepaid, or by 
telex or facsimile and confirmed by registered or certified mail and 
addressed as follows:

          If to ALZA:    ALZA Corporation 
                         950 Page Mill Road 
                         P. 0. Box 10950 
                         Palo Alto, CA 94303-0802
                         Attention: Vice President, Legal

          If to TDC:     Therapeutic Discovery Corporation 
                         1290 Page Mill Road
                         P.O. Box 10051
                         Palo Alto, CA 94303-0860 
                         Attention: Chief Executive Officer

All notices shall be deemed to be effective five days after the date of mailing
or upon receipt if sent by telex or facsimile (but only if followed by certified
or registered confirmation).  Either party may change the address at which
notice is to be received by written notice pursuant to this Section 6.7.

          6.8  PUBLIC DISCLOSURE. Neither party shall disclose to third 
parties, nor originate any publicity, news release or public announcement, 
written or oral, whether to the public, the press, stockholders or otherwise, 
referring to the existence or terms of this Agreement, including its 
existence, the subject

                                       -6-
<PAGE>

matter to which it relates, the performance under it or any of its specific
terms and conditions, except such announcements, as in the opinion of the
counsel for the party making such announcement, are required by law, including
United States securities laws, rules or regulations, without the prior written
consent of the other party.  If a party decides to make an announcement it
believes to be required by law with respect to this Agreement, it will give the
other party such notice as is reasonably practicable and an opportunity to
comment upon the announcement.

          6.9  SEVERABILITY.  If any provision of this Agreement is held by a 
court of competent jurisdiction to be invalid or unenforceable, it shall be 
modified, if possible, to the minimum extent necessary to make it valid and 
enforceable or, if such modification is not possible, it shall be stricken 
and the remaining provisions shall remain in full force and effect; provided, 
however, that if a provision is stricken so as to significantly alter the 
economic arrangements of this Agreement, the party adversely affected may 
terminate this Agreement upon 60 days' prior written notice to the other 
party.

          6.10 RELATIONSHIP OF THE PARTIES.  For all purposes of this 
Agreement, TDC and ALZA shall be deemed to be independent entities and 
anything in this Agreement to the contrary notwithstanding, nothing herein 
shall be deemed to constitute TDC and ALZA as partners, joint venturers, 
co-owners, an association or any entity separate and apart from each party 
itself, nor shall this Agreement constitute any party hereto an employee or

                                       -7-
<PAGE>

agent, legal or otherwise, of the other party for any purposes whatsoever. 
Neither party hereto is authorized to make any statements or representations on
behalf of the other party or in any way obligate the other party, except as
expressly authorized in writing by the other party.  Anything in this Agreement
to the contrary notwithstanding, no party hereto shall assume nor shall be
liable for any liabilities or obligations of the other party, whether past,
present or future.

          6.11 SURVIVAL.  The provisions of Sections 4, 6.3, 6.5, 6.7, 6.8, 
6.9, 6.10 and this Section 6.11 survive the termination for any reason of 
this Agreement. Any payments due under this Agreement with respect to any 
period prior to its termination shall be made notwithstanding the termination 
of this Agreement.

                                       -8-
<PAGE>

     IN WITNESS WHEREOF, the parties have executed this Agreement on the date
first set forth above.

                                    ALZA CORPORATION

                                    By:   /s/ Jane E. Shaw
                                       ----------------------------------------

                                    Title: President and Chief Operating Officer
                                          --------------------------------------


                                    THERAPEUTIC DISCOVERY CORPORATION

                                    By: /s/ Pieter P. Bonsen
                                       ----------------------------------------

                                    Title: President
                                          --------------------------------------



                                       -9-

<PAGE>

                                    SCHEDULE A

                 MANAGEMENT AND ADMINISTRATIVE SERVICES EXPENSES


DIRECT EXPENSES
- ---------------

       Direct Salaries*
       Temporary Help
       Telephone and Communications
       Board of Directors and Corporate Consulting
       Travel and Entertainment
       Annual Audit and Independent Accounting
       Equipment Expenses
       Data Processing Services and Expenses
       Corporate Legal Expense
       Supplies
       Miscellaneous General Administrative Expenses

INDIRECT EXPENSES**
- -----------------

       Management and Administrative Salaries
       Equipment Depreciation, Rent, Maintenance and Services
       Corporate Consulting and Temporary Help
       Legal Expense
       Facilities Expense
       Corporate Data Processing Services and Expenses
       Interest Expense
       Miscellaneous General and Administrative Overhead



- -----------------
*Salaries include benefits.

**Indirect Expenses are billed at a rate of 50% of Direct Salaries.



<PAGE>

                          THERAPEUTIC DISCOVERY CORPORATION
                     AMENDED AND RESTATED 1993 STOCK OPTION PLAN


     1.   PURPOSE.  The purpose of this Therapeutic Discovery Corporation 
Amended and Restated 1993 Stock Option Plan (the "Plan") is to attract, 
retain and motivate directors, officers, employees (including employees who 
are also directors), and consultants of Therapeutic Discovery Corporation 
(the "Company") and its subsidiaries by giving them the opportunity to 
acquire stock ownership in the Company.  Grants under this Plan will consist 
of nonstatutory stock options ("options").

     
     2.   EFFECTIVE DATE AND TERM OF PLAN.  The effective date of this Plan 
is March 30, 1993, the date of its approval by the Company's then sole 
stockholder. This Plan shall terminate automatically on the earlier of (i) 
ten (10) years after its effective date or (ii) the date on which ALZA 
Corporation, a Delaware corporation ("ALZA"), exercises the Purchase Option 
(as described in Section 11), unless terminated earlier by the Board of 
Directors (the "Board") under Section 13 hereof (the "Termination Date").  No 
option grant shall be made after the Termination Date, but all grants made 
prior to the Termination Date shall remain in effect in accordance with their 
terms.
     
     3.   SHARES SUBJECT TO THE PLAN.

          (a)  Number and Source of Shares.  Subject to the provisions of
Section 9, the total number of shares of Class A Common Stock of the Company
(the "Stock") reserved for grants under this Plan is 500,000 shares of Stock. 
If any option terminates or expires without being exercised in full, the shares
issuable under

<PAGE>

such option shall become available again for grant under this Plan.  The shares
to be issued hereunder may consist of authorized and unissued shares or treasury
shares.
          
     (b)  INDIVIDUAL LIMITATION.  The Company may not grant options covering 
in the aggregate more than 100,000 shares of Stock (subject to adjustments 
and substitutions under Section 9) to any one participant in the Plan in any 
one-year period, except that, at the time of an offer of employment as Chief 
Executive Officer of the Company, the Company may grant options covering in 
the aggregate up to 200,000 shares of Stock (subject to adjustments and 
substitutions under Section 9).
     
     4.   ADMINISTRATION OF THE PLAN.  This Plan shall be administered by the 
Board or by a committee that meets the requirements of Rule 16b-3 under the 
Securities Exchange Act of 1934 as in effect from time to time (in either 
case, the "Administrator"). The Administrator may delegate nondiscretionary 
administrative duties to such employees or agents of the Company or a 
subsidiary as it deems proper.  The Administrator may also make rules and 
regulations which it deems useful to administer this Plan.  Any decision or 
action of the Administrator in connection with this Plan or any options 
granted or shares of Stock purchased under this Plan shall be final and 
binding.  No member of the Board shall be liable for any decision, action or 
omission respecting this Plan, or any options granted or shares issued under 
this Plan.

                                       2

<PAGE>

     5.   ELIGIBILITY.

          (a)  Options may be granted to directors, officers, employees
(including employees who are also directors), consultants and potential
employees (in contemplation of and subject to employment) of the Company or any
subsidiary of the Company; provided, however, that grants to directors who are
not also employees of the Company or the Chief Executive Officer of the Company
may be made only in accordance with Section 5(b) below.  Participants in this
Plan shall be approved by the Administrator.  Determination by the Administrator
as to eligibility shall be conclusive.
          
          (b)  Notwithstanding any other provision of this Plan, directors 
who are not also employees of the Company or the Chief Executive Officer of 
the Company (each an "Eligible Director") may receive grants under this Plan 
only in accordance with this Section 5(b).  Automatically and in connection 
with the offer of directorship to an Eligible Director, and subject to that 
person becoming a director of the Company within the time period set forth in 
the offer, the Eligible Director shall be granted an option to purchase 
40,000 shares of Stock; provided, however, that the grant to the Chairman of 
the Board shall be 60,000 shares.  The exercise price for options granted on 
or prior to December 31, 1994 shall be $1.00; thereafter, the exercise price 
shall be eighty-five percent (85%) of the fair market value of the Stock on 
the date of grant.  Such options shall vest as follows: (i) for an Eligible 
Director who first attends a meeting of the Board following his or her

                                       3
<PAGE>

election as a director (as to each Eligible Director, a "Service Date") which
meeting is held on or before June 11, 1995, the option shall vest in four equal
annual increments of 10,000 shares (15,000 shares for the Chairman of the Board)
for each increment, beginning on June 11, 1996; and (ii) for an Eligible
Director who first attends a meeting of the Board following his or her Service
Date which meeting is held after June 11, 1995, the option shall vest in four
equal annual increments of 10,000 shares (15,000 shares for the Chairman of the
Board) for each increment, beginning on the first anniversary of his or her
Service Date.  All options granted pursuant to this Section 5(b) shall be
exercisable until the date that is ten years after the date of grant.  The
Service Date for a director who is not an Eligible Director but who later
becomes an Eligible Director shall, for purposes of this Section 5(b), be
deemed to be the date on which such director first attends a meeting of the
Board following the date on which he or she first becomes an Eligible Director.

     6.   OPTIONS.

          (a)  GRANT.  The Administrator may, in its discretion, grant 
options under this Plan at any time and from time to time before the 
Termination Date of this Plan.  The Administrator shall specify the date of 
grant or, if it fails to, the date of grant shall be the date of the action 
taken by the Administrator to grant the option (in either case, the "Grant 
Date").

          (b)  OPTION AGREEMENTS.  As soon as practicable after the Grant 
Date, the Company will provide the optionee a written stock

                                       4
<PAGE>

option agreement (the "Option Agreement").  The Option Agreement shall identify
the Grant Date, the number of shares of Stock covered by the option, the option
price and the terms and conditions for exercise of the option.
          
     (c)  TERMS AND CONDITIONS OF OPTIONS.  Options granted under this Plan 
shall be subject to the following additional terms and conditions and such 
other terms and conditions not inconsistent with this Plan as the 
Administrator may impose:
               
               (i) EXERCISE OF OPTION.  In order to exercise all or any 
portion of an option which, by its terms, so requires, an optionee must 
remain an employee or a director of, or a consultant to, the Company or a 
subsidiary of the Company until the date on which the option (or portion 
thereof) becomes exercisable (the "Vesting Date").  An option shall be 
partially exercisable on or after each Vesting Date with respect to the 
percentage of total shares of Stock covered by the option set out in the 
Option Agreement. If an option (or portion thereof) is not exercised on the 
earliest Vesting Date on which it becomes exercisable, it may be exercised 
thereafter at any time prior to its expiration date.  Except as otherwise 
provided in this Plan or in the Option Agreement evidencing the option, 
options granted under this Plan shall be exercisable until ten years after 
the Grant Date.

               (ii) OPTION PRICE.  The option price shall be determined in 
good faith by the Administrator; provided, however, that for options granted 
prior to December 31, 1994, the exercise price shall be $1.00; and provided, 
further, that after December

                                       5

<PAGE>

31, 1994, in no event shall the exercise price be less than 85% of the fair
market value of the Stock on the Grant Date.
               
          (iii) METHOD OF EXERCISE.  To the extent the right to purchase shares 
has accrued, an option (or portion thereof) may be exercised from time to time
in accordance with its terms by written notice from the optionee to the Company
stating the number of shares with respect to which the option is being exercised
and accompanied by payment in full of the exercise price of the shares.  Payment
may be made in cash, by check, or by delivery of shares of Stock (duly endorsed
in favor of the Company or accompanied by a duly endorsed stock power), by a
combination of the above, or any other form of consideration approved by the
Administrator (including payment in accordance with a cashless exercise program
as permitted under Regulation T promulgated by the Federal Reserve Board, as
amended from time to time). Any shares delivered to the Company as payment upon
exercise of an option shall be valued at their fair market value as of the date
of exercise of the option determined in good faith by the Administrator. 
Options may not be exercised by any optionee by the delivery of shares of Stock
more frequently than once every six (6) months.
               
          (iv) RESTRICTIONS ON OPTION SHARES.  At the time it grants options 
under this Plan, the Company may retain for itself (or others) rights to 
purchase the shares acquired under the option or impose other restrictions on 
the shares. The terms and conditions of any such rights or other restrictions 
shall be set forth in the Option Agreement evidencing the option.

                                       6
<PAGE>

               (v) NONASSIGNABILITY OF OPTION RIGHTS.  No option shall be 
transferable other than by will or by the laws of descent and distribution or 
a qualified domestic relations order and, otherwise during the lifetime of an 
optionee, only the optionee may exercise an option.

               (vi) EXERCISE AFTER TERMINATION OF SERVICE OR DEATH.  If for 
any reason  other than permanent and total disability or death, an optionee 
ceases to be employed by, or a consultant or director to (if such 
relationship forms the sole basis for the grant), the Company or a 
subsidiary, options held at the date of such termination (to the extent then 
exercisable) may be exercised at any time within three (3) months after the 
date of such termination (but in no event after the expiration date of the 
option as set forth in the Option Agreement). If an optionee becomes 
permanently and totally disabled (within the meaning of Section 22(e)(3) of 
the Internal Revenue Code of 1986, as amended (the "Code") or dies while 
employed by, or a consultant or director to, the Company or a subsidiary, 
(or, if the optionee dies within the period that the option remains 
exercisable after termination of service, consultancy or directorship), 
options then held (to the extent then exercisable) may be exercised by the 
optionee, the optionee's personal representative, or by the person to whom 
the option is transferred by will or the laws of descent and distribution, at 
any time within one year after the disability or death or any lesser period 
specified in the Option Agreement (but

                                       7
<PAGE>

in no event after the expiration date of the option as set forth in the Option
Agreement).
     
     7.   TAXES.

          (a)  Regardless of the form of payment for exercise of an option, the
exercise of an option shall be conditioned upon payment in cash, or provision
satisfactory to the Administrator for payment to the Company, of any federal and
state withholding taxes which, in the Administrator's judgment, are payable in
connection therewith.

          (b)  If and to the extent consented to by the Administrator in its 
sole discretion at any time after an election pursuant to this Section 7(b) 
is made, an optionee may elect in writing to have Stock to be obtained upon 
exercise of an option withheld by the Company on behalf of the optionee to 
pay the amount of tax required by law (as determined by the Company) to be 
withheld. Any such election by an optionee subject (in the view of the 
Company) to the "short swing" profit rules of the Securities and Exchange 
Commission shall be subject to the following limitations: (i) such election 
must be made at least six (6) months before the date that the amount of tax 
to be withheld in connection with such exercise is determined (the "Tax 
Date") and shall be irrevocable; or (ii) such election (A) must be made in 
(or made earlier to take effect in) any ten-day period beginning on the third 
business day following the date of release for publication of the Company's 
quarterly or annual summary statements of earnings and (B) the option must be 
held at least six (6) months prior to

                                       8
<PAGE>

the Tax Date.  Any shares or other securities so withheld will be valued by the
Company as of the Tax Date.  The right to so withhold shares shall relate
separately to each option or any increment thereof.
          
          (c)  If and to the extent consented to by the Administrator in the
manner described in the foregoing Section 7(b), an optionee may elect at any
time to deliver previously-owned shares of Stock to satisfy the tax obligations
in connection with such options.
     
     8.   COMPLIANCE WITH SECURITIES LAWS.  The Company shall not be 
obligated to issue any shares hereunder unless the shares are at that time 
effectively registered or exempt from registration under federal securities 
laws and the offer and sale of the shares are otherwise in compliance with 
all applicable securities laws. The Company shall have no obligation to 
register the shares under federal securities laws or to take whatever other 
steps may be necessary to enable the shares to be offered and sold under 
federal or other securities laws.  Upon exercise of all or any portion of an 
option, an optionee may be required to furnish representations or 
undertakings deemed appropriate by the Company to enable the offer and sale 
of the subject shares or subsequent transfers of any interest in the shares 
to comply with applicable securities laws.  Stock certificates evidencing 
such shares shall bear any legend required by, or useful for purposes of 
compliance with, applicable securities laws, this Plan or the optionee's 
option agreement.

                                       9
<PAGE>

     9.   ADJUSTMENT FOR CHANGES IN CAPITALIZATION.  The existence of 
outstanding options shall not affect the Company's right to effect 
adjustments, recapitalizations, reorganizations, or other changes in its or 
any other corporation's capital structure or business, any merger or 
consolidation, any issuance of bonds, debentures, preferred or prior 
preference stock ahead of or affecting the Stock, the dissolution or 
liquidation of the Company's, or any other corporation's assets or business 
or any other corporate act whether similar to the events described above or 
otherwise.  Subject to Section 10, if the number of outstanding shares of 
Stock is increased or decreased in number or changed into or exchanged for a 
different number or kind of securities of the Company or any other 
corporation by reason of a recapitalization, reclassification, stock split, 
combination of shares, stock dividend, or other event, the number and kind of 
securities with respect to which options may be granted under this Plan, the 
individual limitations under Section 3(b) hereof, the number and kind of 
securities as to which outstanding options may be exercised, and the option 
price at which outstanding options may be exercised hereunder shall be 
proportionately adjusted.
     
     10.  DISSOLUTION, LIQUIDATION, MERGER.  In the event of a dissolution or 
liquidation of the Company, a merger or consolidation in which the Company is 
not the surviving corporation, a reverse merger in which the Company is the 
surviving corporation but in which more than fifty percent (50%) of the 
shares of its Stock outstanding before the merger are held, after

                                       10

<PAGE>

the merger, by holders different from those immediately prior to the merger, or
a sale of more than eighty percent (80%) of the assets of the Company, the time
at which each outstanding option may be exercised shall be accelerated to a time
such that the optionee (upon exercise of the option) would be eligible to
receive the consideration payable to holders of Stock in connection with such
liquidation, dissolution, merger, consolidation, reverse merger or sale. 
Notwithstanding any provision of the Option Agreement to the contrary, each
outstanding option shall expire on the fifth business day immediately preceding
the effective date of such liquidation, dissolution, merger, consolidation,
reverse merger or sale.
     
     11.  PURCHASE OPTION.

          All Stock issuable pursuant to the Plan is and will be subject to 
an option (the "Purchase Option") of ALZA as described in the Restated 
Certificate of Incorporation of the Company to purchase such Stock at a 
purchase price determined in accordance with Article Fifth thereof.  Copies 
of the Restated Certificate of Incorporation are available at the principal 
place of business of the Company at 950 Page Mill Road, Palo Alto, CA, 94304 
and will be furnished to any optionee on request and without cost.  In the 
event that ALZA exercises the Purchase Option, the time at which each 
outstanding option may be exercised shall be accelerated to a time such that 
the optionee (upon exercise of the option) would be eligible to receive the 
consideration payable by ALZA to holders of Stock if and to the extent such 
option is exercised in a timely

                                       11
<PAGE>

manner.  Notwithstanding any provision of the Option Agreement to the contrary,
each outstanding option shall expire on the fifth business day immediately
preceding the closing of the exercise of the Purchase Option.
     
     12.  RIGHTS AS STOCKHOLDER.  An optionee shall have no rights as a 
stockholder with respect to any shares covered by an option until the date of 
exercise in accordance with the provisions of this Plan and the applicable 
Option Agreement. Subject to Sections 9, 10 and 11, no adjustment shall be 
made for dividends or other rights for which the record date is prior to the 
date of exercise.
     
     13.  TERMINATION OR AMENDMENT.  The Board may at any time terminate or 
amend this Plan except that no amendment or termination of this Plan shall 
(i) adversely affect any rights of an optionee under the terms of an option 
granted before the date of such termination or amendment, (ii) increase the 
number of shares of Stock which may be covered by options under this Plan, 
except under Section 9 above or with the approval of the stockholders of the 
Company, or (iii) extend the Termination Date of this Plan.  In addition, the 
Board may not otherwise amend or alter the Plan to increase materially the 
benefits accruing to optionees under the Plan or to modify materially the 
requirements as to eligibility for participation in the Plan without the 
approval of the stockholders of the Company if the Board deems such 
stockholder approval appropriate to comply with Section 16b-3 under the 
Securities Exchange Act of 1934 as in effect from time to time.  
Notwithstanding the foregoing, except as may be necessary to

                                       12
<PAGE>

conform with changes in the Code, the Employee Retirement Income Security Act,
or the rules thereunder, the Plan shall not be amended more than once every six
months if any such amendment would have the effect of amending in any way the
provisions set forth in Section 5(b) of the Plan relating to automatic option
grants to Eligible Directors.
     
     14.  PARENT AND SUBSIDIARY.  As used in this Plan, "parent" and 
"subsidiary" mean any corporation in an unbroken chain of corporations which 
includes the Company if, at the relevant time, each of the corporations other 
than the last corporation in the chain owns stock possessing more than fifty 
percent (50%) of the total combined voting power of all classes of stock of 
one of the other corporations in the chain.
     
     15.  GOVERNING LAW.  This Plan and the rights of all persons under this 
Plan shall be construed in accordance with and under applicable provisions of 
the Code and the laws of the State of California.

                                   * * * * *

     The Board and the Company's then sole stockholder adopted the Plan on 
March 30, 1993.  The Board amended and restated the Plan (subject to 
stockholder approval) on March 3, 1995 and the stockholders approved the 
amendments to and restatement of the Plan on May 11, 1995.

                                       13

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                                                                    EXHIBIT 10.6

THERAPEUTIC DISCOVERY CORPORATION
Executive Deferral Plan (EDP)
Master Plan Document
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Executive Deferral Plan (EDP)
Master Plan Document
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                              TABLE OF CONTENTS

                                                                            Page
                                                                            ----

Article 1 Definitions . . . . . . . . . . . . . . . . . . . . . . . . . .     1

Article 2 Eligibility . . . . . . . . . . . . . . . . . . . . . . . . . .     5

     2.1  Selection By Committee. . . . . . . . . . . . . . . . . . . . .     5

     2.2  Plan Agreement, Election Form and Beneficiary Election Form . .     5

Article 3 Commitments, Interest and Participation . . . . . . . . . . . .     5

     3.1  Participant Deferral Amount Commitment. . . . . . . . . . . . .     5

     3.2  Deferral Amounts. . . . . . . . . . . . . . . . . . . . . . . .     5

     3.3  Pre-Distribution Crediting Rate . . . . . . . . . . . . . . . .     6

     3.4  Distribution Rate . . . . . . . . . . . . . . . . . . . . . . .     6

     3.5  Termination of Participation. . . . . . . . . . . . . . . . . .     6

     3.6  Unforeseeable Financial Emergency . . . . . . . . . . . . . . .     6

Article 4 7th Year Distribution . . . . . . . . . . . . . . . . . . . . .     7

     4.1  7th Year Distribution . . . . . . . . . . . . . . . . . . . . .     7

     4.2  Timing of Election. . . . . . . . . . . . . . . . . . . . . . .     7

     4.3  Payment of Distribution . . . . . . . . . . . . . . . . . . . .     7

     4.4  Secondary Account Balance . . . . . . . . . . . . . . . . . . .     7

Article 5 Retirement Benefit. . . . . . . . . . . . . . . . . . . . . . .     8

     5.1  Retirement Benefit. . . . . . . . . . . . . . . . . . . . . . .     8

     5.2  Rate of Interest for Retirement Benefit; Vesting. . . . . . . .     8

     5.3  Commencement of Retirement Benefits . . . . . . . . . . . . . .     8

     5.4  Death Prior to Completion of Retirement Benefits. . . . . . . .     8

     5.5  Withdrawal Election . . . . . . . . . . . . . . . . . . . . . .     8

Article 6 Survivor Benefit. . . . . . . . . . . . . . . . . . . . . . . .     9

     6.1  Survivor Benefit. . . . . . . . . . . . . . . . . . . . . . . .     9

     6.2  Amount of Survivor Benefit. . . . . . . . . . . . . . . . . . .     9

     6.3  Benefit Period. . . . . . . . . . . . . . . . . . . . . . . . .     9

     6.4  Eligibility Requirements for Survivor Benefit . . . . . . . . .     9


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Master Plan Document
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Article 7 Termination Benefit . . . . . . . . . . . . . . . . . . . . . .    10

     7.1  Termination Benefit . . . . . . . . . . . . . . . . . . . . . .    10

     7.2  Primary Account Balance . . . . . . . . . . . . . . . . . . . .    10

     7.3  Secondary Account Balance . . . . . . . . . . . . . . . . . . .    10

     7.4  Payment of Benefit. . . . . . . . . . . . . . . . . . . . . . .    10

Article 8 Disability Benefit. . . . . . . . . . . . . . . . . . . . . . .    11

     8.1  Amount of Disability Benefit. . . . . . . . . . . . . . . . . .    11

Article 9 Beneficiary Designation . . . . . . . . . . . . . . . . . . . .    11

     9.1  Beneficiary Designation . . . . . . . . . . . . . . . . . . . .    11

     9.2  Change of Beneficiary Designation . . . . . . . . . . . . . . .    11

     9.3  No Participant Designation. . . . . . . . . . . . . . . . . . .    11

     9.4  Effect of Payment . . . . . . . . . . . . . . . . . . . . . . .    11

Article 1O Plan Termination, Amendment or Modification. . . . . . . . . .    12

     10.1 Plan Termination. . . . . . . . . . . . . . . . . . . . . . . .    12

     10.2 Amendment or Modification . . . . . . . . . . . . . . . . . . .    12

     10.3 Change in Control . . . . . . . . . . . . . . . . . . . . . . .    12

     10.4 Effect of Payment . . . . . . . . . . . . . . . . . . . . . . .    12

Article 11 Trust. . . . . . . . . . . . . . . . . . . . . . . . . . . . .    13

     11.1 Establishment of the Trust; Premium . . . . . . . . . . . . . .    13

     11.2 Interrelationship of the Plan and the Trust . . . . . . . . . .    13

Article 12 Claims Procedures. . . . . . . . . . . . . . . . . . . . . . .    13

     12.1 Presentation of Claim . . . . . . . . . . . . . . . . . . . . .    13

     12.2 Notification of Decision. . . . . . . . . . . . . . . . . . . .    13

     12.3 Review of a Denied Claim. . . . . . . . . . . . . . . . . . . .    14

     12.4 Decision on Review. . . . . . . . . . . . . . . . . . . . . . .    14

     12.5 Legal Action. . . . . . . . . . . . . . . . . . . . . . . . . .    14


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Master Plan Document
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Article 13 Miscellaneous. . . . . . . . . . . . . . . . . . . . . . . . .    15

    13.1  Unsecured General Creditor. . . . . . . . . . . . . . . . . . .    15

    13.2  Nonassignability. . . . . . . . . . . . . . . . . . . . . . . .    15

    13.3  Not a Contract of Employment. . . . . . . . . . . . . . . . . .    15

    13.4  Protective Provisions . . . . . . . . . . . . . . . . . . . . .    15

    13.5  Terms . . . . . . . . . . . . . . . . . . . . . . . . . . . . .    15

    13.6  Captions. . . . . . . . . . . . . . . . . . . . . . . . . . . .    16

    13.7  Governing Law . . . . . . . . . . . . . . . . . . . . . . . . .    16

    13.8  Validity. . . . . . . . . . . . . . . . . . . . . . . . . . . .    16

    13.9  Notice. . . . . . . . . . . . . . . . . . . . . . . . . . . . .    16

    13.10 Successors. . . . . . . . . . . . . . . . . . . . . . . . . . .    16

    13.11 Spouse's Interest . . . . . . . . . . . . . . . . . . . . . . .    16

    13.12 Distribution in the Event of Taxation . . . . . . . . . . . . .    17

    13.13 Incompetent . . . . . . . . . . . . . . . . . . . . . . . . . .    17

Article 14 Administration . . . . . . . . . . . . . . . . . . . . . . . .    17

    14.1  Committee Duties. . . . . . . . . . . . . . . . . . . . . . . .    17

    14.2  Agents. . . . . . . . . . . . . . . . . . . . . . . . . . . . .    17

    14.3  Binding Effect of Decision. . . . . . . . . . . . . . . . . . .    18

    14.4  Indemnity of Committee. . . . . . . . . . . . . . . . . . . . .    18

    14.5  Company Information . . . . . . . . . . . . . . . . . . . . . .    18

    14.6  Change in Payments. . . . . . . . . . . . . . . . . . . . . . .    18


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THERAPEUTIC DISCOVERY CORPORATION
Executive Deferral Plan (EDP)
Master Plan Document
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                         THERAPEUTIC DISCOVERY CORPORATION

                              EXECUTIVE DEFERRAL PLAN

                                      Purpose

     The primary purpose of the Executive Deferral Plan (the "EDP" or "Plan") of
Therapeutic Discovery Corporation, a Delaware corporation ("TDC") is to help
attract and maintain high caliber management.  It is the intention of TDC that
the Plan be unfunded for tax purposes and for purposes of Title I of the
Employee Retirement Income Security Act of 1974, as amended.

                                      Article I
                                     Definitions

     For purposes hereof, unless otherwise clearly apparent from the context, 
the following phrases or terms shall have the following indicated meanings:

1.1  "Affiliate" shall mean any corporation or entity in which TDC has at least
     twenty-five percent (25%) of the voting control through ownership of equity
     securities or otherwise.

1.2  "Base Rate" shall be the greater of ten percent (10%) or Moody's Seasoned
     Corporate Bond Rate, measured on the November 1 prior to that Plan Year.

1.3  "Beneficiary" shall mean the person or persons, or the entity designated by
     a Participant to receive any benefits payable under this Plan upon the 
     death of such Participant.

1.4  "Beneficiary Designation Form" shall mean the form established from time to
     time by the Committee that a Participant completes, signs and returns to 
     the Committee to designate one or more Beneficiaries.

1.5  "Bonus Award" shall mean any cash bonus awarded to the Participant under
     the provisions of any of the Company's bonus plans relating to the calendar
     year prior to the Plan Year.  Such Bonus Award shall be credited to the 
     Participant's EDP Account as of January 1 of the Plan Year.


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Master Plan Document
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1.6  "Change in Control" shall mean the first to occur of the following events:

     a)  Any "person" (as that term is used in Section 13 and 14(d)(2) of the
         Securities Exchange Act of 1934 ("Exchange Act")) is or becomes the 
         beneficial owner (as that term is used in Section 13(d) of the Exchange
         Act), directly or indirectly, of 50% or more of TDC's capital stock 
         entitled to vote in the election of directors (however, the option of 
         ALZA Corporation ("ALZA") to acquire the shares of TDC (the "Purchase 
         Option") shall not be deemed, for purposes of this Plan, to be a 
         "Change of Control," unless or until the Purchase Option is 
         exercised.);

     b)  During any period of two consecutive years, individuals who at the
         beginning of such period constitute the board of directors of TDC cease
         for any reason to constitute at least a majority thereof, unless the 
         election or the nomination for election by TDC's stockholders of each 
         new director was approved by a vote of at least three-quarters of the 
         directors still in office of TDC who were directors at the beginning of
         the period;

     c)  Any consolidation or merger of TDC, other than a merger of TDC in
         which the holders of the common stock of TDC immediately prior to the 
         merger hold more than 50% of the common stock of the surviving 
         corporation immediately after the merger;

     d)  The stockholders of TDC approve any plan or proposal for the 
         liquidation or dissolution of TDC; or

     e)  Substantially all of the assets of TDC are sold or otherwise 
         transferred to parties that are not within a "controlled group of 
         corporations" (as defined in Section 1563 of the Internal Revenue Code 
         of 1986, as amended) in which TDC is a member.

1.7  "Committee" shall mean the administrative committee appointed to manage and
     administer the Plan in accordance with its provisions pursuant to Article 
     14, which Committee shall be the Compensation Committee of the Board of 
     Directors unless otherwise determined by the Board of Directors.

1.8  "Company" shall mean Therapeutic Discovery Corporation, a Delaware 
     corporation, and any subsidiary or Affiliate thereof.

1.9  "Deferral Amounts" shall mean the amount of Salary and Bonus Award for a
     calendar year deferred by a Participant pursuant to the election made on 
     the Election Form.

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Master Plan Document
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1.10 "Disability" shall mean a period of disability during which a Participant
     qualifies for benefits under the Company's group long-term disability plan 
     or, if a Participant does not participate in such plan, a period of 
     disability during which the Participant would have qualified for benefits 
     under such plan had the Participant been a participant in such plan, as 
     determined in the sole discretion of the Committee.

1.11 "EDP Account" shall mean the account comprised of the Participant's 
     Deferral Amounts and interest credited thereon, which shall be equal to the
     sum of the Primary Account Balance and the Secondary Account Balance.  EDP 
     Accounts shall be maintained for each Participant.  A Participant's EDP 
     Account shall be utilized solely as a device for the measurement and 
     determination of the amounts to be paid to the Participant pursuant to this
     Plan.  A Participant's EDP Account shall not constitute or be treated as a 
     trust fund.

1.12 "Election Form" shall mean the form established from time to time by the
     Committee that a Participant completes, signs and returns to the Committee 
     to make an election under the Plan.

1.13 "Moody's Seasoned Corporate Bond Rate" shall mean the applicable "Seasoned
     Corporate Bond" rate, which is an arithmetic average of yields of 
     representative bonds, including industrials, public utilities, Aaa, Aa, A 
     and Baa bonds as published by Moody's Investors Service, Inc. or any 
     successor to that service.

1.14 "Participant" shall mean directors of the Company and senior level 
     management who are selected for participation in the Plan by the Committee 
     and who elect to participate by executing and delivering to the Committee 
     the Plan Agreement, the Election Form and the Beneficiary Designation Form.

1.15 "Plan" shall mean the Executive Deferral Plan of the Company, which shall
     be defined by this instrument and by the Plan Agreement, as may be amended 
     from time to time.

1.16 "Plan Agreement" shall mean a written agreement, as may be amended from
     time to time, which is entered into by and between the Company and a
     Participant.  Each Plan Agreement executed by a Participant shall provide 
     for the entire benefit to which such Participant is entitled to under the 
     Plan, and the Plan Agreement bearing the latest date of acceptance by the 
     Committee shall govern such entitlement.

1.17 "Plan Year" shall mean calendar year 1996 and subsequent calendar years
     thereafter.

1.18 "Preferred Rate" shall mean 125% of the Base Rate.  The Preferred Rate for
     the 1996 Plan Year shall be twelve and one half percent (12.5%).

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THERAPEUTIC DISCOVERY CORPORATION
Executive Deferral Plan (EDP)
Master Plan Document
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1.19 "Primary Account Balance" shall equal the Participant's Deferral Amounts,
     plus compounded interest credited yearly thereon at the Standard Rate, all 
     as determined in accordance with Section 3.3 below.

1.20 "Retirement" and "Retire" shall mean termination of employment or severance
     of a directorship with the Company (i) on or after the attainment of age 
     sixty-five (65) or (ii) at a time when the sum of age at last birthday 
     ("Rule of 70") plus Years of Service equal 70 or more.

1.21 "Salary" shall mean annual salaries and wages before 401(k) and other
     qualified plan reductions and amounts deferred pursuant to this Plan 
     excluding, however, moving allowances, participation in clinical studies, 
     income arising from stock option plans, imputed income due to fringe 
     benefits, bonuses (including Bonus Awards) or similar items paid to the 
     Participant.

1.22 "Secondary Account Balance" shall equal that portion of the cumulative
     interest on the EDP Account, determined in accordance with Section 3.3 
     below, that is equal to the sum of (i) the difference between the interest 
     on the Primary Account accrued at the Preferred Rate and the interest on 
     the Primary Account accrued at the Standard Rate, and (ii) the yearly 
     interest at the Preferred Rate on the Secondary Account itself.

1.23 "Standard Rate" shall mean fifty percent (50%) of the Preferred Rate.  The
     Standard Rate for the 1996 Plan Year shall be six and one quarter percent
     (6.25%).

1.24 "Termination of Employment" shall mean the ceasing of employment or
     directorship with the Company, voluntarily or involuntarily, for any reason
     other than Retirement, Disability, or death.  If a Participant is both an
     employee and a Director, a Termination of Employment shall occur only upon 
     the termination of the last position held.

1.25 "Trust" shall mean the trust that may be established by the Company, in its
     sole discretion, to which assets may be transferred to for the purpose of 
     paying benefits under this Plan.

1.26 "Unforeseeable Financial Emergency" shall mean an unanticipated emergency
     that is caused by an event beyond the control of the Participant that would
     result in severe financial hardship to the Participant resulting from (i) a
     sudden and unexpected illness or accident of the Participant or a dependent
     of the Participant, (ii) a loss of the Participant's property due to 
     casualty, or (iii) such other extraordinary and unforeseeable circumstances
     arising as a result of events beyond the control of the Participant, all as
     determined in the sole discretion of the Committee."


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THERAPEUTIC DISCOVERY CORPORATION
Executive Deferral Plan (EDP)
Master Plan Document
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1.27 "Years of Service" shall mean the total number of years in which a
     Participant has been employed by the Company and has completed in each of 
     those years 1,000 hours of service.  For purposes of this definition only, 
     a year of employment shall be a 365 day period (or 366 day period in the 
     case of a leap year) that for the first year of employment commences on the
     employee's date of hiring and that, for any subsequent year, commences on 
     an anniversary of that hiring date.  For a non-employee Director 
     Participant, "Years of Service" shall mean service as a Director during any
     part of a calendar year.

                                      Article 2
                                     Eligibility

2.1  SELECTION BY COMMITTEE.  The Committee shall have the sole discretion to
     determine the individuals who, in accordance with the purpose of the Plan, 
     will be eligible to become Participants.

2.2  PLAN AGREEMENT, ELECTION FORM AND BENEFICIARY ELECTION FORM.  As a
     condition of participation, each Participant shall complete, execute and 
     return to the Committee prior to the commencement of the Plan Year for 
     which the Participant is to commence participation in the Plan, a Plan 
     Agreement, an Election Form and a Beneficiary Designation Form. In 
     subsequent Plan Years, a Participant shall complete, execute and return to 
     the Committee an Election Form.

                                       Article 3
                       Commitments, Interest and Participation

3.1  PARTICIPANT DEFERRAL AMOUNT COMMITMENT.  Pursuant to the Election Form
     delivered to the Committee prior to the commencement of a Plan Year, the 
     Participant may elect for each Plan Year to defer up to fifty percent (50%)
     of his/her Salary and up to one hundred percent (100%), in each case in 
     full percentage points, of his/her Bonus Award, subject to the limitations 
     of Section 3.2 below.

3.2  DEFERRAL AMOUNTS.  If Salary is deferred by a Participant, the minimum rate
     of deferral shall be $200 per month ($2,400/calendar year) Deferral Amounts
     must be in increments of one hundred dollars ($100).  Bonus Awards may be
     deferred independently of Salary deferrals.


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THERAPEUTIC DISCOVERY CORPORATION
Executive Deferral Plan (EDP)
Master Plan Document
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3.3  PRE-DISTRIBUTION CREDITING RATE.  Subject to the provisions and limitations
     of the Plan, interest shall be credited at the Preferred Rate on the EDP 
     Account balance annually on the last day of each Plan Year as though all 
     Deferral Amounts, if any, for that Plan Year were made on July 1 of the 
     Plan Year. Despite the foregoing, in the event of a Participants death, 
     Retirement or Termination of Employment prior to the last day of a Plan 
     Year, interest for that Plan Year shall be credited on the EDP Account 
     balance up to the day prior to the Participant's death, Retirement or 
     Termination of Employment as though all Deferral Amounts, if any, for that 
     Plan Year were made on January 1 of the Plan Year.

3.4  DISTRIBUTION RATE.  If, pursuant to the terms of the Plan, a Participant or
     Beneficiary is entitled to receive his or her benefit (other than the 7th
     Year Distribution) in installments, the crediting rate on the undistributed
     portion of the benefits for all periods following the last day of the month
     prior to the date upon which the Participant is no longer an employee or
     Director shall be one of two fixed rates as specified in the Plan.  The
     "Preferred Distribution Rate" shall be composed of the average Preferred 
     Rate for the last five (5) Plan Years prior to the commencement of the 
     installment payments, including the Plan Year in which the Participant 
     terminates employment, or if the Participant has participated in the Plan 
     for less than five (5) Plan Years, the average of such rates for the number
     of Plan Years that the Participant has participated in the Plan.  The 
     "Standard Distribution Rate" shall be composed of the average Standard Rate
     for the last five (5) Plan Years prior to the commencement of the 
     installment payments, including the Plan Year in which the Participant 
     terminates employment, or if the Participant has participated in the Plan 
     for less than five (5) Plan Years, the average of such rates for the number
     of Plan Years that the Participant has participated in the Plan.

3.5  TERMINATION OF PARTICIPATION.  A Participant who remains an employee or
     director of the Company may not terminate participation in the Plan for any
     reason other than those outlined in Section 3.6, Article 5, Article 6, 
     Article 7, Article 8 or Section 10.1.

3.6  UNFORESEEABLE FINANCIAL EMERGENCY.  In the case of Unforeseeable Financial 
     Emergency, the Committee may, at its discretion, allow the Participant to
     discontinue deferrals, terminate participation or receive a payout from the
     Plan.  The amount of such payout shall be at the discretion of the 
     Committee, provided that such payout shall not exceed the lesser of (i) the
     Participant's EDP Account balance, or (ii) the amount reasonably needed to 
     satisfy the Unforeseeable Financial Emergency.


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THERAPEUTIC DISCOVERY CORPORATION
Executive Deferral Plan (EDP)
Master Plan Document
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                                    Article 4
                             7th Year Distribution

4.1  7TH YEAR DISTRIBUTION.  Except as provided in this Article 4, no
     distribution shall be made to a Participant or his or her Beneficiary under
     the Plan until death, Retirement, Disability, Termination of Employment, or
     Unforeseeable Financial Emergency.  In connection with each election to 
     defer an annual Deferral Amount (as provided in Section 4.2 below), a 
     Participant may elect to receive a future "7th Year Distribution" from the 
     Plan with respect to that annual Deferral Amount. 

4.2  TIMING OF ELECTION.  Prior to December 31 of the Plan Year immediately
     preceding the Plan Year for which a deferral election is being made, the 
     Participant shall elect to:

     a)  receive that Deferral Amount plus interest (as specified below) as a
         7th Year Distribution, or

     b)  leave that Deferral Amount in the EDP Account until such time as
         distributions are required by the other provisions of the Plan.

     Such election shall be made on the Election Form.  If the Participant
     chooses to receive the 7th Year Distribution, he/she shall receive from the
     EDP Account an amount equal to the Primary Account Balance as of the last 
     day of the Plan Year that is seven years after the last day of the calendar
     year prior to the first Plan Year in which he or she commences 
     participation in the Plan.

4.3  PAYMENT OF DISTRIBUTION.  The payment shall be made in a lump sum within 90
     days of the last day of the Primary Account Balance measurement date 
     provided in Section 4.2 above.

4.4  SECONDARY ACCOUNT BALANCE.  If the Primary Account Balance is fully 
     distributed in accordance with this Article 4, the Secondary Account 
     Balance shall constitute the entire EDP Account and shall be paid in 
     accordance with the terms and provisions of this Plan.


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THERAPEUTIC DISCOVERY CORPORATION
Executive Deferral Plan (EDP)
Master Plan Document
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                                    Article 5
                               Retirement Benefit

5.1  RETIREMENT BENEFIT. A Participant who Retires shall become eligible to
     receive, in accordance with this Article, his or her EDP Account (the 
     "Retirement Benefit").

5.2  RATE OF INTEREST FOR RETIREMENT BENEFIT; VESTING.  Upon a Participant's
     Retirement, the interest on his/her unpaid EDP Account will be based on 
     the Preferred Distribution Rate.  If it has not already done so, a 
     Participant's Secondary Account Balance shall vest upon his or her 
     Retirement.

5.3  COMMENCEMENT OF RETIREMENT BENEFITS.  Retirement Benefits shall be paid
     over a fifteen (15) year period, payable annually.  Other methods of 
     payment shall be at the sole discretion of the Committee.  The initial 
     annual Retirement Benefit payment shall commence within thirty (30) days of
     actual Retirement. All subsequent annual payments shall be made prior to 
     February 28 of each calendar year thereafter until the Participant's EDP 
     Account balance is paid in full.

5.4  DEATH PRIOR TO COMPLETION OF RETIREMENT BENEFITS.  If a retired Participant
     dies before the applicable Retirement Benefit is paid in full, the 
     Participant's unpaid Retirement Benefit payments shall continue and be paid
     to that Participant's Beneficiary.

5.5  WITHDRAWAL ELECTION.  A Participant who is eligible to and is receiving a
     Retirement Benefit under the Plan may elect, at any time, to withdraw the 
     then remaining unpaid portion of his or her EDP Account balance less a 10% 
     withdrawal penalty (the net amount shall be referred to as the "Withdrawal 
     Amount").  No partial withdrawals of that balance shall be allowed.  The 
     Participant shall make this election by giving the Committee advance 
     written notice of the election in a form determined from time to time by 
     the Committee.  The penalty shall be equal to 10% of the Participant's 
     remaining EDP Account Balance determined immediately prior to the 
     withdrawal.  The Participant shall be paid the Withdrawal Amount within 60 
     days of his or her election.  Once the Withdrawal Amount is paid, the 
     Participant's participation in the Plan shall terminate and the Participant
     shall not be eligible to participate in the Plan in the future.

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THERAPEUTIC DISCOVERY CORPORATION
Executive Deferral Plan (EDP)
Master Plan Document
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                                    Article 6
                                Survivor Benefit

6.1  SURVIVOR BENEFIT.  If a Participant dies before Retirement, Termination of 
     Employment or a Disability, the Company will pay the benefit described in
     this Article (the "Survivor's Benefit") to the designated Beneficiary of 
     the Participant, in lieu of the Retirement Benefits.

6.2  AMOUNT OF SURVIVOR BENEFIT.  The Survivor Benefit shall equal the existing
     EDP Account Balance at the time of death.

6.3  BENEFIT PERIOD.  The Survivor Benefit shall be paid in a lump sum or over a
     period of time not to exceed 15 years, with interest credited on the unpaid
     balance at the Standard Distribution Rate, as follows:

              Balance of EDP Account       Payment
             ------------------------    -----------
             Up to $100,000             One Lump Sum
             $100,001 - $250,000           5 Years
             $250,001 - $500,000          10 Years
             $500,001 or More             15 Years

     The Committee shall have the sole discretion to decide the number of
benefit payments.  The lump sum payment, or the initial installment payment, of
the Survivor Benefit shall commence within ninety (90) days of the Participant's
death.  Any subsequent annual installment payments shall be made prior to
February 28 of each calendar year thereafter until the Participant's EDP Account
balance is paid in full.

6.4  ELIGIBILITY REQUIREMENTS FOR SURVIVOR BENEFIT.  The obligation of the
     Company to pay the Survivor Benefit to any Beneficiary shall exist only if:

     a)  at the time of death, the Participant (i) was employed by the Company
         or was a director of the Company, (ii) was on an authorized leave of 
         absence, or (iii) was absent from employment due to Disability, and, in
         each such case, had not yet begun receiving the Retirement Benefit; and

     b)  proof of death, in such form as reasonably deemed acceptable by the
         Committee, is furnished.


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THERAPEUTIC DISCOVERY CORPORATION
Executive Deferral Plan (EDP)
Master Plan Document
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                                    Article 7
                               Termination Benefit

7.1  TERMINATION BENEFIT.  The Participant who for any reason experiences a
     Termination of Employment prior to his or her Retirement, death or 
     Disability shall be entitled to a Termination Benefit in accordance with 
     this Article.

7.2  PRIMARY ACCOUNT BALANCE.  The Participant terminating at any time shall be
     entitled to his or her Primary Account Balance.

7.3  SECONDARY ACCOUNT BALANCE.  The terminating Participant shall be entitled
     to the vested portion of his or her Secondary Account Balance in accordance
     with the vesting schedule contained below, which describes the vesting of 
     the accrued interest on each annual Deferral Amount:

                                                  Vested Percentage of
                                                  Accrued Interest With
                                                  Respect to Each Annual
                                                  Deferral Amount in
     Date of Termination                          Secondary Account Balance
     -------------------                          -------------------------

     Prior to the beginning of
     the eighth Plan Year
     following the Plan Year in
     which an Annual Deferral
     Amount is Deferral                                    0%

     On or after the beginning
     of the eighth Plan Year
     following the Plan Year in
     which an Annual Deferral
     Amount is Deferred                                   100%

     Unvested Secondary Account Balances are forfeited at the date of
     Termination of Employment.

7.4  PAYMENT OF BENEFIT. Payment of the Primary Account Balance and the
     Secondary Account balance shall be made in a lump sum within ninety (90) 
     days of the Participant's Termination of Employment.


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THERAPEUTIC DISCOVERY CORPORATION
Executive Deferral Plan (EDP)
Master Plan Document
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                                    Article 8
                               Disability Benefit

8.1  AMOUNT OF DISABILITY BENEFIT.  In the case of the Disability of the
     Participant, the Committee may, at anytime during the Disability period and
     in its sole discretion, allow the Participant to discontinue deferrals and 
     to continue to be eligible for benefits under Articles 4, 5, 6 or 7 (in 
     accordance with those Articles), or terminate participation and receive a 
     "Disability Benefit" in accordance with this Article 8. The amount of the 
     Disability Benefit shall be equal to the Participant's existing EDP Account
     balance, as of the date the Committee makes a determination to terminate 
     the Participant's participation in the Plan.  The Disability Benefit payout
     shall be at the discretion of the Committee, provided that such payout 
     shall begin within ninety (90) days of such determination and shall not 
     exceed 15 years in total.  The unpaid balance shall be credited with 
     interest at the Standard Distribution Rate from the date of the 
     determination through completion of payout.

                                     Article 9
                              Beneficiary Designation

9.1  BENEFICIARY DESIGNATION.  Each Participant shall have the right, at any
     time, to designate any person or persons as Beneficiary or Beneficiaries 
     (both principal as well as contingent) to whom benefits under this Plan 
     shall be paid in the event of the Participant's death prior to complete 
     distribution of the benefits due under this Plan.

9.2  CHANGE OF BENEFICIARY DESIGNATION. Any Beneficiary designation may be 
     changed by a Participant at any time by filing a new Beneficiary 
     Designation Form with the Committee and shall become effective only when 
     received, accepted and acknowledged by the Company in writing.  The filing 
     and acceptance of a new Beneficiary Designation Form will cancel all 
     Beneficiary Designations previously filed.  The Committee shall be entitled
     to rely on the last designation filed by the Participant prior to death.  
     Despite the foregoing, if the Participant names someone other than his or 
     her spouse as a Beneficiary, a spousal consent, in the form designated by 
     the Committee, must be signed by that Participant's spouse and returned to 
     the Committee.

9.3  NO PARTICIPANT DESIGNATION.  If a Participant fails to designate a
     Beneficiary as provided above, or if all designated Beneficiaries 
     predecease the Participant, or die prior to complete distribution of the 
     Participant's benefits, then the Participant's designated Beneficiary shall
     be deemed to be the surviving spouse.  If the Participant has no surviving 
     spouse, the benefits remaining under the Plan shall be payable to the 
     Participant's estate.

9.4  EFFECT OF PAYMENT.  The payment of benefits under the Plan to the deemed
     Beneficiary shall completely discharge the Company's obligations under 
     this Plan.


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THERAPEUTIC DISCOVERY CORPORATION
Executive Deferral Plan (EDP)
Master Plan Document
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                                    Article 10
                    Plan Termination, Amendment or Modification

10.1 PLAN TERMINATION.  The Company reserves the right to terminate the Plan at
     any time. Upon termination of the Plan, the Participants' then existing EDP
     Accounts, including interest earned through the date of such termination, 
     shall be paid out as if each Participant Retired on the date of 
     termination.  Prior to a Change in Control, the Company reserves the right,
     at its sole discretion and notwithstanding any elections made by the 
     Participant, to pay such benefits in a lump sum or in annual installments 
     for up to 15 years, with interest credited on the unpaid balance using the 
     Preferred Distribution Rate.  The termination of the Plan shall not 
     adversely affect any Participant or Beneficiary who has become entitled to 
     the payment of any benefits under the Plan as of the date of termination; 
     provided, however, that the Company shall have the right to pay any 
     remaining EDP Account balance in a lump sum.

10.2 AMENDMENT OR MODIFICATION.  The Company may, at any time, amend or modify
     the Plan in whole or in part, provided, however, that no amendment or 
     modification shall be effective to decrease or restrict any EDP Account 
     balance, calculated as if the Participant experienced a Termination of 
     Employment as of the effective date of the amendment or modification, or if
     the Participant was eligible to Retire, the Participant had Retired as of 
     the effective date of the amendment or modification.  The amendment or 
     modification of the Plan shall not affect any Participant or Beneficiary 
     who has become entitled to the payment of benefits under the Plan as of the
     date of the amendment or modification, provided that the Committee has the 
     right to make a lump sum payment of all remaining balances.

10.3 CHANGE IN CONTROL.  If a Change in Control occurs, a Participant shall
     immediately become vested in his or her Secondary Account Balance.  If the 
     Change of Control is due to the exercise of the Purchase Option by ALZA and
     the Participant becomes an employee of ALZA in connection with the Change 
     of Control, then the Participant will no be deemed to have "Retired" or to 
     have a "Termination of Employment" from the Company for purposes of this 
     Plan, and this Plan will continue, with respect to such Participant, as an 
     ALZA plan, subject to the approval of ALZA's Board of Directors.  If (i) 
     the Participant does not become an ALZA employee upon such Change of 
     Control or (ii) the ALZA Board of Director does not approve the 
     continuation of this Plan as an ALZA plan, then the Participant's EDP 
     Account shall be paid to the Participant in three equal annual 
     installments, the first within sixty days of the decision of the ALZA Board
     of Directors, or the last day of employment with the Company, whichever is
     applicable.  Interest shall accrue at the Preferred Rate on all unpaid 
     amounts.

10.4 EFFECT OF PAYMENT.  The full payment of the applicable benefit under 
     Articles 5, 6, 7 or 8 of the Plan shall completely discharge all 
     obligations to a Participant and his or her Beneficiaries under this Plan 
     and the Participant's Plan Agreement shall terminate.

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THERAPEUTIC DISCOVERY CORPORATION
Executive Deferral Plan (EDP)
Master Plan Document
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                                    Article 11
                                      Trust

11.1 ESTABLISHMENT OF THE TRUST; PREMIUM.  The Company may establish, in its
     sole discretion, the Trust and, if so established, shall at least annually
     transfer over to the Trust such assets as the Committee determines, in its 
     sole discretion, are necessary to provide for some or all of the Company's 
     future liabilities under the Plan.

11.2 INTERRELATIONSHIP OF THE PLAN AND THE TRUST.  The provisions of the Plan
     and each Plan Agreement shall govern the rights of a Participant to receive
     distributions pursuant to the Plan.  The provisions of the Trust, if the 
     Trust is established, shall govern the rights of the Company, a 
     Participant, a Participants' Beneficiary and the Company's creditors as to 
     the assets of the Trust.  The Company shall at all times remain liable to 
     carry out its obligations under the Plan.  The Company's obligations under 
     the Plan may be satisfied with Trust assets distributed pursuant to the 
     terms of the Trust.

                                     Article 12
                                 Claims Procedures

12.1 PRESENTATION OF CLAIM.  Any Participant or Beneficiary of a deceased
     Participant (such Participant or Beneficiary being referred to below as a 
     "Claimant") may deliver to the Committee a written claim for a 
     determination with respect to the amounts distributable to such Claimant 
     from the Plan.  If such a claim relates to the contents of a notice 
     received by the Claimant, the claim must be made within 60 days after such 
     notice was received by the Claimant.  All other claims must be made within 
     180 days of the date on which the event that caused the claim to arise 
     occurred.  The claim must state with particularity the determination 
     desired by the Claimant.

12.2 NOTIFICATION OF DECISION.  The Committee shall consider a Claimant's claim
     within 60 days of receipt of that claim, and shall notify the Claimant in 
     writing:

     a)  that the Claimant's requested determination has been made, and that
         the claim has been allowed in full; or that the Committee has reached a
         conclusion contrary, in whole or in part, to the Claimant's requested
         determination, and such notice must set forth in a manner calculated to
         be understood by the Claimant:

            (i)   the specific reason(s) for the denial of the claim, or any 
                  part of it;

            (ii)  the specific reference(s) to pertinent provisions of the Plan 
                  upon which such denial was based;

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THERAPEUTIC DISCOVERY CORPORATION
Executive Deferral Plan (EDP)
Master Plan Document
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            (iii) a description of any additional material or information 
                  necessary for the Claimant to perfect the claim, and an 
                  explanation of why such material or information is necessary; 
                  and

            (iv)  an explanation of the claim review procedure set forth in 
                  Section 12.3 below.

12.3 REVIEW OF A DENIED CLAIM.  Within 60 days after receiving a notice from the
     Committee that a claim has been denied, in whole or in part, a Claimant (or
     the Claimant's duly authorized representative) may file with the Committee 
     a written request for a review of the denial of the claim.  Thereafter, but
     not later than 30 days after the review procedure began, the Claimant (or 
     the Claimant's duly authorized representative):

     c)  may review pertinent documents;

     d)  may submit written comments or other documents; and/or

     e)  may request a hearing, which the Committee, in its sole discretion,
         may grant.

12.4 DECISION ON REVIEW.  The Committee shall render its decision on review
     promptly, and not later than 60 days after the filing of a written request 
     for review of the denial, unless a hearing is held or other special 
     circumstances require additional time, in which case the Committee's 
     decision must be rendered within 120 days after such date.  Such decision 
     must be written in a manner calculated to be understood by the Claimant, 
     and it must contain:

     d)  specific reasons for the decision;

     e)  specific reference(s) to the pertinent Plan provisions upon which the
         decision was based; and

     f)  such other matters as the Committee deems relevant.

12.5 LEGAL ACTION.  A Claimant's compliance with the foregoing provisions
     of this Article 12 is a mandatory prerequisite to a Claimant's right to 
     commence any legal action with respect to any claim for benefits under 
     this Plan.


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THERAPEUTIC DISCOVERY CORPORATION
Executive Deferral Plan (EDP)
Master Plan Document
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                                   Article 13
                                 Miscellaneous

13.1 UNSECURED GENERAL CREDITOR.  Participants and their Beneficiaries, heirs
     and successors shall have the status of general unsecured creditors of the
     Company, and the Plan constitutes a mere promise by the Company to make 
     benefit payments in the future.

13.2 NONASSIGNABILITY.  Neither a Participant nor any other person shall have
     any right to commute, sell, assign, transfer, pledge, anticipate, mortgage 
     or otherwise encumber, transfer, hypothecate, alienate, or convey in 
     advance of actual receipt, the amounts, if any, payable hereunder, or any 
     part thereof, which are, and all rights to which are, expressly declared to
     be unassignable and non-transferable.  No part of the amounts payable 
     shall, prior to actual payment, be subject to seizure, attachment, 
     garnishment or sequestration for the payment of any debts, judgments, 
     alimony or separate maintenance owed by a Participant or any other person, 
     nor be transferable by operation of law in the event of a Participant's or 
     any other person's bankruptcy or insolvency.

13.3 NOT A CONTRACT OF EMPLOYMENT.  The terms and conditions of this Plan shall
     not be deemed to constitute a contract of employment between the Company 
     and the Participant, and the Participant (or Beneficiary) shall have no 
     rights against the Company except as may otherwise be specifically provided
     herein.  Such employment is acknowledged to be an "at will" employment 
     relationship that can be terminated at any time for any reason, with or 
     without cause, unless expressly provided in a written employment agreement.
     Moreover, nothing in this Plan shall be deemed to give a Participant the 
     right to be retained in the service of the Company or to interfere with the
     right of the Company to discipline or discharge him at any time.

13.4 PROTECTIVE PROVISIONS.  A Participant will cooperate with the Company by
     furnishing any and all information requested by the Company in order to 
     facilitate the payment of benefits hereunder, and by taking such physical 
     examinations as the Company may deem necessary, and taking such other 
     action as may be requested by the Company.

13.5 TERMS. Whenever any words are used herein in the masculine, they shall be
     construed as though they were used in the feminine in all cases where they 
     would so apply; and wherever any words are used herein in the singular or 
     in the plural, they shall be construed as though they were used in the 
     plural or in the singular, as the case may be, in all cases where they 
     would so apply.

- --------------------------------------------------------------------------------

                                       15

<PAGE>


THERAPEUTIC DISCOVERY CORPORATION
Executive Deferral Plan (EDP)
Master Plan Document
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

13.6  CAPTIONS.  The captions of the articles, sections and paragraphs of this
      Plan are for convenience only and shall not control or affect the meaning
      or construction of any of its provisions.

13.7  GOVERNING LAW.  The provisions of this Plan shall be construed and 
      interpreted according to the laws of the State of California.

13.8  VALIDITY.  In case any provision of this Plan shall be illegal or invalid
      for any reason, said illegality or invalidity shall not affect the 
      remaining parts hereof, but this Plan shall be construed and enforced as 
      if such illegal and invalid provision had never been inserted herein.

13.9  NOTICE.  Any notice or filing required or permitted to be given to the
      Committee under this Plan shall be sufficient if in writing and 
      hand-delivered, or sent by registered or certified mail or facsimile 
      transmission, to:

                       Therapeutic Discovery Corporation
                       Executive Deferral Plan Committee
                                1375 California
                                P.O. Box 10051
                           Palo Alto, CA 94303-0806

      Such notice shall be deemed given as of the date of delivery or, if 
      delivery is made by mail, as of the date shown on the postmark on the 
      receipt for registration or certification.

13.10 SUCCESSORS.  The provisions of this Plan shall bind and inure to the
      benefit of the Company and its successors and assigns.  The term 
      successors as used herein shall include any corporate or other business 
      entity which shall, whether by merger, consolidation, purchase or 
      otherwise, acquire all, or substantially all, of the business and assets 
      of the Company, and successors or any such corporation or other business 
      entity.

13.11 SPOUSE'S INTEREST. Interest in the benefits hereunder of a spouse of a
      Participant who has predeceased the Participant shall automatically pass 
      to the Participant and shall not be transferable by such spouse in any 
      manner, including but not limited to such spouse's will, nor shall such 
      interest pass under the laws of intestate succession.


- --------------------------------------------------------------------------------

                                       16
<PAGE>

THERAPEUTIC DISCOVERY CORPORATION
Executive Deferral Plan (EDP)
Master Plan Document
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

13.12 DISTRIBUTION IN THE EVENT OF TAXATION.  If, for any reason, all or any
      portion of a Participant's benefit under this Plan becomes taxable to the 
      Participant prior to receipt, a Participant may petition the Committee for
      a distribution of assets sufficient to meet the Participant's tax 
      liability (including additions to tax, penalties and interest).  Upon the 
      grant of such a petition, which grant shall not be unreasonably withheld, 
      the Company shall distribute to the Participant funds in an amount equal 
      to that Participant's federal, state and local tax liability associated 
      with such taxation (which amount shall not exceed a Participant's accrued 
      benefit under the Plan), which liability shall be measured by using that 
      Participant's then current highest federal, state and local marginal tax 
      rate, plus the rates or amounts for the applicable additions to tax, 
      penalties and interest.  If the petition is granted, the tax liability
      distribution shall be made within 90 days of the date when the 
      Participant's petition is granted.  Such a distribution shall affect and 
      reduce the benefits to be paid under this Plan.

13.13 INCOMPETENT.  In the event that it shall be found upon evidence 
      satisfactory to the Committee that any Participant or Beneficiary to whom 
      a benefit is payable under this Plan is unable to care for his or her 
      affairs because of illness or accident, any payment due (unless prior 
      claim had been made by a duly authorized guardian or other legal 
      representative) may be paid, upon appropriate indemnification of the 
      Committee, to the spouse of such person or any other person deemed by the 
      Committee to have incurred expense for such Participant. Any such payment 
      shall be a payment out of the account of the Participant and shall be a 
      complete discharge of any liability of the Plan for such payment amount.

                                        Article 14
                                      Administration

14.1  COMMITTEE DUTIES.  This Plan shall be administered by the Committee.  The
      Committee shall also have the authority to make, amend, interpret, and 
      enforce all appropriate rules and regulations for the administration of 
      this Plan and decide or resolve any and all questions including 
      interpretations of this Plan, as may arise in connection with the Plan.

14.2  AGENTS.  In the administration of this Plan, the Committee may, from time
      to time, employ agents and delegate to them such administrative duties as 
      it sees fit and may from time to time consult with counsel who may be 
      counsel to the Company.


- --------------------------------------------------------------------------------

                                       17

<PAGE>

THERAPEUTIC DISCOVERY CORPORATION
Executive Deferral Plan (EDP)
Master Plan Document
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------

14.3 BINDING EFFECT OF DECISIONS.  The decision or action of the Committee with
     respect to any question arising out of or in connection with the 
     administration, interpretation, and application of the Plan, and the rules 
     and regulations promulgated hereunder, shall be final and conclusive, and 
     binding upon all persons having any interest in the Plan.

14.4 INDEMNITY OF COMMITTEE.  The Company shall indemnify and hold harmless the
     members of the Committee against any and all claims, loss, damage, expense 
     or liability arising from any action or failure to act with respect to 
     this Plan, except in the case of willful misconduct by the Committee or 
     any of its members.

14.5 COMPANY INFORMATION.  To enable the Committee to perform its functions, the
     Company shall supply full and timely information to the Committee on all 
     matters relating to the salary of all Participants, the date and 
     circumstances of the retirement disability, death, or termination of 
     employment of all Participants, and such other pertinent information as the
     Committee may reasonably require.

14.6 CHANGE IN PAYMENTS.  The Committee shall have the power, at its sole
     discretion, to change the manner and timing of payments to be made to a 
     Participant or Beneficiary from that which would be otherwise payable.



IN WITNESS WHEREOF the Company has signed this Master Plan Document

this_____day of________________,1996.


Company:                                     Therapeutic Discovery Corporation,
                                             a Delaware corporation

                                             By: /s/ Gary L. Neil
                                                --------------------------------
                                             Its: President
                                                 -------------------------------

- --------------------------------------------------------------------------------

                                       18


<PAGE>

                                                                    EXHIBIT 10.7



                            AGREEMENT REGARDING CERTAIN
                            PRODUCTS AND ACTIVITIES AND
                      AMENDMENT NO. 1 TO DEVELOPMENT AGREEMENT
                            DATED AS OF MARCH 10, 1993


     This Agreement Regarding Certain Products and Activities and Amendment No.
1 to Development Agreement dated as of March 10, 1993 (the "Agreement") is made
effective as of October 25, 1994 by and between ALZA Corporation, a Delaware
corporation ("ALZA"), and Therapeutic Discovery Corporation, a Delaware
corporation ("TDC").

                                     RECITALS

     WHEREAS, ALZA and TDC have entered into that certain Development Agreement
dated as of March 10, 1993 (the "Development Contract") pursuant to which ALZA
performs research and development activities on behalf of TDC directed toward
the development of pharmaceutical products; and

     WHEREAS, ALZA is marketing, on its own behalf, a Testoderm-Registered 
Trademark- Testosterone Transdermal System, consisting of a multilayered 
patch for the delivery of testosterone ("Testoderm-Registered Trademark-"); 
and

     WHEREAS, Testoderm-Registered Trademark- has been approved in the United 
States by the United States Food and Drug Administration (the "FDA") for 
marketing only as a treatment for testosterone deficiency in hypogonadal 
males; and
     
     WHEREAS, TDC and ALZA desire that TDC fund a program, including further 
clinical testing, to be conducted by ALZA with respect to Testoderm-Registered 
Trademark-, with the goal of receiving clearance to market 
Testoderm-Registered Trademark- for the treatment of AIDS wasting syndrome 
(the "Testoderm-Registered Trademark- Development Program"); and

     WHEREAS, such an arrangement is not currently contemplated within the terms
of the Development Contract; and

     WHEREAS, under the terms of the Development Contract, ALZA is currently 
performing research and development activities on behalf of TDC directed 
toward the development of an additional product or products for the delivery 
of testosterone (any such product is hereby referred to as a "Second 
Generation Testoderm-Registered Trademark- Product"); and

     WHEREAS, ALZA desires to expand the use of its drug delivery technologies
to biotechnology, gene therapy and other areas and, to this end, would like to
evaluate proprietary compounds without extensive business negotiations with the
third party who owns the rights to such compounds before determining whether
ALZA's drug delivery technologies will be useful with such compounds; and

<PAGE>

     WHEREAS, TDC and ALZA desire that TDC fund such material evaluation
activities, on a project-by-project basis; and

     WHEREAS, such an arrangement is not currently contemplated within the terms
of the Development Contract:

     NOW, THEREFORE, in consideration of the foregoing and the agreements
contained herein, ALZA and TDC hereby agree as follows:

     1.   FUNDING OF TESTODERM-REGISTERED TRADEMARK- DEVELOPMENT PROGRAM.  
In consideration of the royalty payments set forth in Section 4 of this 
Agreement, TDC hereby agrees to fund the Testoderm-Registered Trademark- 
Development Program in amounts as approved by TDC from time to time (the 
"Development Payments").  The Testoderm-Registered Trademark- Development 
Program shall be set forth in a work plan prepared by ALZA which is subject 
to the approval of TDC, and the parties agree to revise such work plan from 
time to time so that it remains a faithful best estimate of the work to be 
done under the Testoderm-Registered Trademark- Development Program as agreed 
upon by ALZA and TDC.  TDC shall not be obligated to make Development 
Payments in excess of those expressly approved by TDC and ALZA shall not be 
obligated to perform work on the Testoderm-Registered Trademark- Development 
Program which would result in Development Payments exceeding amounts 
expressly approved by TDC.  ALZA and TDC agree that the Development Payments 
shall be made on the same basis as "Development Cost" (as defined in the 
Development Contract) and shall constitute "Development Costs" within the 
meaning of Sections 4.2, 5.1 and 5.3 of the Development Contract and that the 
funding of the Testoderm-Registered Trademark- Development Program constitutes 
an activity undertaken pursuant to the Development Contract within the 
meaning of Section 10.1 thereof; as such, Development Payments are intended 
to be included as part of the "total amount paid by this corporation under 
the Development Contract" for purposes of Article FIFTH, Section (A)(10)(c) 
of the Restated Certificate of Incorporation of TDC, as part of 
"expenditure[s] pursuant to the Development Contract" for purposes of Article 
FIFTH, Section (A)(2) of the Restated Certificate of Incorporation of TDC, as 
part of "the total amounts paid by this corporation pursuant to the 
Development Contract" for purposes of Article FIFTH, Section (A)(14) of the 
Restated Certificate of Incorporation of TDC, and as part of "any additional 
amounts paid by this corporation pursuant to the Development Contract" for 
purposes of Article FIFTH, Section (A)(5) of the Restated Certificate of 
Incorporation of TDC.  Notwithstanding the foregoing, TDC and ALZA confirm 
and agree that Testoderm-Registered Trademark- shall not be considered a 
"Product" within the meaning of the Development Contract, the Technology 
License Agreement between ALZA and TDC dated as of March 10, 1993 (the 
"Technology License Agreement") and the License Option Agreement between ALZA 
and TDC dated as of March 10, 1993 (the "License Option Agreement").

                                       2

<PAGE>

     2.   DEVELOPMENT OF SECOND GENERATION TESTODERM-REGISTERED TRADEMARK- 
PRODUCT.  Except with respect to the royalty payments set forth in Section 4 
of this Agreement, TDC and ALZA hereby confirm that the Second Generation 
Testoderm-Registered Trademark- Product is being developed by ALZA for TDC 
under, and the relationship of the parties with respect to the Second 
Generation Testoderm-Registered Trademark- Product is governed by the terms 
of, the Development Contract, the Technology License Agreement and the 
License Option Agreement.

     3.   MATERIAL EVALUATION PROJECTS.

          (a)  ACCEPTANCE OF MATERIAL EVALUATION PROJECTS.  From time to time,
ALZA will provide TDC with work plans and cost estimates for evaluations of
identified proprietary compounds ("Material Evaluation Candidates").  Such
evaluations will include the preparation of preliminary, abbreviated commercial
assessments and an examination of technical feasibility.  Within 45 days after
ALZA provides TDC with such a recommendation for a Material Evaluation
Candidate, TDC shall notify ALZA in writing of its acceptance or rejection of
such Material Evaluation Candidate.  Upon written acceptance of a Material
Evaluation Candidate by TDC, such Material Evaluation Candidate shall be deemed
to be a "Material Evaluation Project."

          (b)  FUNDING OF MATERIAL EVALUATION PROJECTS.  In consideration of the
royalty payments set forth in Section 4 of this Agreement, TDC hereby hires ALZA
to perform the Material Evaluation Projects and agrees to fund the Material
Evaluation Projects in amounts to be approved by TDC from time to time (the
"Project Payments").  The Material Evaluation Projects shall be set forth in
work plans prepared by ALZA which are subject to the approval of TDC, and the
parties agree to revise approved work plans from time to time so that they
remain faithful best estimates of the work to be done under the Material
Evaluation Projects as agreed upon by ALZA and TDC.  TDC shall not be obligated
to make Project Payments in excess of those expressly approved by TDC, and ALZA
shall not be obligated to perform work on the Material Evaluation Projects which
would result in Project Payments exceeding amounts expressly approved by TDC. 
ALZA and TDC agree that the Project Payments shall be made on the same basis as
"Development Costs" (as defined in the Development Contract) and shall
constitute "Development Costs" within the meaning of Sections 4.2, 5.1 and 5.3
of the Development Contract and that the funding of the Material Evaluation
Projects constitutes an activity undertaken pursuant to the Development Contract
within the meaning of Section 10.1 thereof; as such, Project Payments are
intended to be included as part of the "total amount paid by this corporation
under the Development Contract" for purposes of Article FIFTH, Section
(A)(10)(c) of the Restated Certificate of Incorporation of TDC, as part of
"expenditure[s] pursuant to the Development Contract" for purposes of Article
FIFTH, Section (A)(2) of the Restated Certificate of Incorporation of TDC, as
part of "the total amounts paid by this corporation pursuant to the Development
Contract" for purposes


                                       3

<PAGE>

of Article FIFTH, Section (A)(14) of the Restated Certificate of 
Incorporation of TDC, and as part of "any additional amounts paid by this 
corporation pursuant to the Development Contract" for purposes of Article 
FIFTH, Section (A)(5) of the Restated Certificate of Incorporation of TDC.  
Notwithstanding the foregoing, TDC and ALZA confirm and agree that such 
Material Evaluation Projects are not "Products" within the meaning of the 
Development Contract, the Technology License Agreement and the License Option 
Agreement, unless and until accepted for development as a "Product" under the 
terms set forth in the Development Contract.

     4.   NEW SECTION 7.4A OF THE DEVELOPMENT CONTRACT.  In consideration of the
foregoing, a new Section 7.4A is hereby added to the Development Contract as
follows:

     "7.4A ROYALTIES ON CERTAIN PRODUCTS AND ACTIVITIES.  For purposes of this 
   Section 7.4A only, capitalized terms not otherwise defined in this Agreement
   shall have the meanings ascribed to them in that certain Agreement Regarding
   Certain Products and Activities and Amendment No. 1 to Development Agreement
   (the "Amendment"), which Amendment is effective as of October 25, 1994.

           (a)  TESTODERM-REGISTERED TRADEMARK-. In consideration of 
        TDC's making Development Payments with respect to Testoderm-Registered 
        Trademark- pursuant to the Amendment, upon receiving clearance from 
        the FDA to market Testoderm-Registered Trademark- as a treatment for 
        AIDS wasting syndrome, ALZA shall pay TDC royalties with respect to 
        Testoderm-Registered Trademark- as follows: (i) up to a maximum of 5% 
        of worldwide Net Sales of Testoderm-Registered Trademark- determined 
        as follows: 1% of such Net Sales, plus an additional 0.1% of such Net 
        Sales for each full one million dollars of Development Payments with 
        respect to Testoderm-Registered Trademark- paid by TDC; plus (ii) up 
        to a maximum of 50% of worldwide Sublicensing Revenues in respect of 
        sales of Testoderm-Registered Trademark- determined as follows: 10% 
        of such Sublicensing Revenues, plus an additional 1% of such 
        Sublicensing Revenues for each full one million dollars of 
        Development Payments with respect to Testoderm-Registered Trademark- 
        paid by TDC.  In determining payments due under this Section 7.4A(a), 
        Net Sales and Sublicensing Revenues shall be reduced by the dollar 
        amount of any license or similar payments made to third parties by 
        ALZA or its Affiliates with respect to the sales of 
        Testoderm-Registered Trademark-. In determining payments under this 
        Section 7.4A(a) for any year, the amount of applicable Development 
        Payments shall be determined as of December 31 of the preceding 
        calendar year.

          (b)  SECOND GENERATION TESTODERM-REGISTERED TRADEMARK- PRODUCT. If 
     ALZA exercises its License Option with respect to the Second Generation

                                       4

<PAGE>

     Testoderm-Registered Trademark- Product, ALZA shall pay TDC royalties as 
     follows: (i) in any calendar quarter in which worldwide Net Sales of 
     Testoderm-Registered Trademark- are greater than worldwide Net Sales of 
     the Second Generation Testoderm-Registered Trademark- Product, then ALZA 
     shall pay TDC royalties under the terms set forth in the License 
     Agreement in the form attached as Exhibit A to the License Option 
     Agreement and (ii) in any calendar quarter in which worldwide Net Sales 
     of Testoderm-Registered Trademark- are less than worldwide Net Sales of 
     the Second Generation Testoderm-Registered Trademark- Product, then ALZA 
     shall pay TDC the royalties set forth in Section 7.4A(b)(i) PLUS the 
     royalties set forth in Section 7.4A(a). Notwithstanding the terms of the 
     License Option Agreement and the License Agreement in the form attached 
     as Exhibit A thereto, ALZA and TDC hereby agree that any License 
     Agreement entered into with respect to the Second Generation 
     Testoderm-Registered Trademark- Product will reflect the foregoing 
     revised royalty structure.

          (c)  ROYALTIES IN CONNECTION WITH MATERIAL EVALUATION PROJECTS.  In 
     consideration of TDC making Project Payments with respect to Material 
     Evaluation Projects pursuant to the Amendment, if any Material Evaluation 
     Project results in an arrangement whereby the third party who holds the 
     rights to the proprietary compound being studied funds the ongoing costs of
     a development program conducted by ALZA for a product incorporating such 
     compound (a "Project Product"), ALZA shall pay TDC royalties with respect 
     to each such Project Product as follows: (i) up to a maximum of 5% of 
     worldwide Net Sales of such Project Product determined as follows: 2% of 
     such Net Sales, plus an additional 0.1% of such Net Sales for each full 
     one million dollars of Project Payments paid by TDC with respect to such 
     Project Product; plus (ii) up to a maximum of 50% of worldwide Sublicensing
     Revenues with respect of sales of such Project Product determined as 
     follows: 20% of such Sublicensing Revenues, plus an additional 1% of such 
     Sublicensing Revenues for each full one million dollars of Project Payments
     paid by TDC with respect to such Project Product. If any Material 
     Evaluation Project results in an arrangement whereby TDC funds the ongoing 
     costs of a development program conducted by ALZA and TDC for a Project
     Product accepted for development as a "Product" under the terms set forth 
     in the Development Contract, such Project Product shall in all respects be 
     a "Product" within the meaning of the Development Contract, the Technology 
     License Agreement and the License Option Agreement and, if ALZA exercises 
     its License Option for such Project Product, ALZA shall pay TDC royalties 
     for such Project Product under the terms set forth in the License Agreement
     in the form attached as Exhibit A to the License Option Agreement (and 
     Project Payments with respect to such Project Product shall be included in 
     Development Cost for purposes of


                                       5
<PAGE>

       calculating the royalties due to TDC thereunder.) If any Material 
       Evaluation Project results in a product development and commercialization
       arrangement other than an arrangement whereby either (i) the third party 
       who owns the rights to the proprietary compound being studied, or (ii) 
       TDC, funds the ongoing costs of a development program conducted by ALZA 
       for a Project Product, ALZA and TDC agree to negotiate in good faith an 
       alternative payment structure or other economic arrangement to compensate
       TDC for making Project Payments with respect to the Material Evaluation 
       Project.  In determining payments due under this Section 7.4A(c), Net 
       Sales and Sublicensing Revenues shall be reduced by the dollar amount of 
       any license or similar payments made to third parties by ALZA or its 
       Affiliates with respect to sales of the relevant Project Product.  In 
       determining payments under this Section 7.4A(c) for any year, the amount 
       of applicable Project Payments shall be determined as of December 31 of 
       the preceding calendar year."

     ALZA and TDC hereby confirm and agree that the royalties or other payments
to TDC described in Section 7.4A of the Development Contract, as amended by this
Agreement, are intended to be included within the definition of "Royalties" as
such term is defined in the Restated Certificate of Incorporation of TDC.

     5.   AMENDMENTS TO SECTIONS 7.6 OF THE DEVELOPMENT CONTRACT.  Section 
7.6 of the Development Contract is hereby amended so that each reference to 
"Section 7.4" is deleted and replaced with a reference to "Sections 7.4, 
7.4A(a) and 7.4A(c)" and to add the words "Testoderm-Registered Trademark- 
and Project Product" after the term "Other Royalty-Bearing Product."

     6.   APPROVAL OF BOARDS OF DIRECTORS.  ALZA and TDC represent and 
warrant, each to the other, that the foregoing amendments to the Development 
Contract have been approved by their respective Boards of Directors prior to 
execution of this Agreement.

     7.   INDEMNIFICATION.  ALZA shall indemnify, defend and hold TDC 
harmless from and against any and all liabilities, claims, demands, damages, 
costs, expenses or money judgments rendered against TDC and its Affiliates 
(as defined in the Development Contract), which arise out of the use, design, 
labeling or manufacture, processing, packaging, sale or commercialization of 
Testoderm-Registered Trademark- by ALZA, its Affiliates (as defined in the 
Development Contract), subcontractors and sublicensees.  TDC shall permit 
ALZA's attorneys, at ALZA's discretion and cost, to handle and control the 
defense of any claims or suits as to which TDC may be entitled to indemnity 
hereunder, and TDC agrees not to settle any such claims or suits without the 
prior written consent of ALZA.  TDC shall give ALZA prompt notice in writing, 
in the manner set forth in Section 13.7 of the Development Contract, of any 
claim or

                                       6

<PAGE>


demand made against TDC for which TDC may be entitled to indemnity hereunder. 
TDC shall have the right to participate, at its own expense, in the defense of
any such claim or demand to the extent it so desires.

     8.   MISCELLANEOUS.  This Agreement shall terminate upon termination of 
the Development Contract.  Except as otherwise expressly provided herein, the 
terms of the Development Contract, the Technology License Agreement and the 
License Option Agreement shall remain in full force and effect.  This 
Agreement may not be amended except in a writing signed by both parties.  If 
any provision of this Agreement is held by a court of competent jurisdiction 
to be invalid or unenforceable, it shall be modified, if possible, to the 
minimum extent necessary to make it valid and enforceable or, if such 
modification is not possible, it shall be stricken and the remaining 
provisions remain in full force and effect; provided, however, that if a 
provision is stricken so as to significantly alter the economic arrangements 
of this Agreement, the Development Contract or the "Purchase Option" as 
defined in the Restated Certificate of Incorporation of TDC, the party 
adversely affected may terminate this Agreement upon 60 days' prior written 
notice to the other party.  Neither party may assign its rights or 
obligations hereunder without the prior written consent of the other party, 
which consent may not be unreasonably withheld; provided, however, that ALZA 
may assign such rights and obligations hereunder to any person or entity with 
which ALZA is merged or consolidated or which purchases all or substantially 
all of the assets of ALZA.  This Agreement shall be governed by the laws of 
the State of California as applied to residents of that state entering into 
contracts to be performed in that state.  The headings set forth at the 
beginning of the various sections of this Agreement are for reference and 
convenience and shall not affect the meanings of the provisions of this 
Agreement.

     IN WITNESS WHEREOF, ALZA and TDC have caused this Agreement to be executed
as of the date first set forth above by their duly authorized representatives.

ALZA CORPORATION                           THERAPEUTIC DISCOVERY
                                           CORPORATION

By: /s/ Peter D. Staple                     By: /s/ Gary L. Neil 
   -----------------------------------         ---------------------------------

Title: Vice President and General Counsel   Title: President and Chief Executive
                                                   Officer

Date: March 27, 1996                        Date: 27 March 1996  
     -----------------------------------         -------------------------------


                                       7


<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
<LEGEND>
THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE
FINANCIAL STATEMENTS INCLUDED IN ITEM I OF FORM 10-K DATED DECEMBER 31,
1996 AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL
STATEMENTS.
</LEGEND>
<MULTIPLIER> 1,000,000
       
<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-END>                               DEC-31-1996
<CASH>                                              11
<SECURITIES>                                        75
<RECEIVABLES>                                        1
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                                    87
<PP&E>                                               0
<DEPRECIATION>                                       0
<TOTAL-ASSETS>                                      88
<CURRENT-LIABILITIES>                               19
<BONDS>                                              0
                                0
                                          0
<COMMON>                                             0
<OTHER-SE>                                          69
<TOTAL-LIABILITY-AND-EQUITY>                        88
<SALES>                                              0
<TOTAL-REVENUES>                                     8
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                                   100
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                   0
<INCOME-PRETAX>                                   (95)
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                      (95)
<EPS-PRIMARY>                                  (12.25)
<EPS-DILUTED>                                  (12.25)
        

</TABLE>


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