CV THERAPEUTICS INC
10-Q, 1997-05-15
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
Previous: QUANTUM GROUP INC /NV/, 10QSB, 1997-05-15
Next: CV THERAPEUTICS INC, DEF 14A, 1997-05-15



<PAGE>

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

                                   ___________

                                    Form 10-Q

           /X/ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
                       SECURITIES AND EXCHANGE ACT OF 1934

                  FOR THE QUARTERLY PERIOD ENDED MARCH 31, 1997

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

          FOR THE TRANSITION PERIOD FROM ______________ TO ______________
                                        
                         COMMISSION FILE NUMBER 0-21643

                                   ___________

                              CV THERAPEUTICS, INC.

             (Exact name of Registrant as specified in its charter)

              DELAWARE                              43-1570294
    (State or other jurisdiction of      (IRS Employer Identification No.)
    incorporation or organization)

                 3172 PORTER DRIVE, PALO ALTO, CALIFORNIA 94304
          (Address of principal executive offices, including zip code)

                                 (415) 812-0585
              (Registrant's telephone number, including area code)


     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 and 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 the number of shares outstanding of each of the issuer's classes
of common stock as of the latest practicable date.

                    Class                     Outstanding at April 30, 1997
                    -----                     -----------------------------
     Common Stock $.001 par value                      6,908,047


<PAGE>

<TABLE>
                                                                            Page Number
<S>                                                                         <C>
Part I    Financial Information                                             
     
     Item 1.  Financial Statements

              Condensed Consolidated Balance Sheets                           3
              Condensed Consolidated Statements of Operations                 4
              Condensed Consolidated Statements of Cashflow                   5
              Notes to the Condensed Consolidated                             6
                 Financial Statements

     Item 2.  Management's Discussion and Analysis
                 of Financial Condition and                                   7
                 Results of Operations

Part II   Other Information

     Item 6.  Exhibits and Reports on Form 8-K                               10

Part III  Signatures
</TABLE>

<PAGE>

PART I FINANCIAL INFORMATION
ITEM 1. FINANCIAL STATEMENTS

     

                              CV THERAPEUTICS, INC.
                          (A DEVELOPMENT STAGE COMPANY)

                      CONDENSED CONSOLIDATED BALANCE SHEETS

                                 (IN THOUSANDS)


<TABLE>
<CAPTION>
                                                                                  MARCH 31,    DECEMBER 31,
                                                                                    1997          1996
                                                                                    ----          ----
                                                                                (UNAUDITED)        (1)
<S>                                                                             <C>           <C>
                                                 ASSETS
 Current assets:
   Cash and cash equivalents . . . . . . . . . . . . . . . . . . . . . . .         $17,285        $19,575
   Short-term investments. . . . . . . . . . . . . . . . . . . . . . . . .          14,073          1,993
   Other current assets. . . . . . . . . . . . . . . . . . . . . . . . . .             571            454
                                                                                   -------        -------
 Total current assets. . . . . . . . . . . . . . . . . . . . . . . . . . .          31,929         22,022
                                                                           
 Long-term investments . . . . . . . . . . . . . . . . . . . . . . . . . .           3,031              -
 Notes receivable from officers and employees. . . . . . . . . . . . . . .             475            475
 Property and equipment, net . . . . . . . . . . . . . . . . . . . . . . .           2,878          3,072
 Intangible and other assets . . . . . . . . . . . . . . . . . . . . . . .             521            570
                                                                                   -------        -------

                                                                                   $38,834        $26,139
                                                                                   -------        -------
                                                                                   -------        -------
                                  LIABILITIES AND STOCKHOLDERS' EQUITY
 Current liabilities:
   Accounts payable. . . . . . . . . . . . . . . . . . . . . . . . . . . .            $171           $405
   Accrued liabilities . . . . . . . . . . . . . . . . . . . . . . . . . .           1,165          1,304
   Current portion of long-term debt . . . . . . . . . . . . . . . . . . .               -             15
   Current portion of capital lease obligation . . . . . . . . . . . . . .             647             20
   Deferred revenue, short-term portion. . . . . . . . . . . . . . . . . .           2,000              -
                                                                                   -------        -------

 Total current liabilities . . . . . . . . . . . . . . . . . . . . . . . .           3,983          1,744
                                                                           
 Long-term portion of capital lease obligation . . . . . . . . . . . . . .           1,069              -
 Long-term portion of long-term debt . . . . . . . . . . . . . . . . . . .           6,000          5,000
 Accrued rent. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .             627            719
 Deferred revenue, long-term portion . . . . . . . . . . . . . . . . . . .           5,000              -
 Commitments
 Stockholders' equity:
   Common stock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .          70,595         65,414
   Warrants to purchase common stock . . . . . . . . . . . . . . . . . . .           1,225          1,225
   Notes receivable issued for stock . . . . . . . . . . . . . . . . . . .            (171)          (171)
   Deferred compensation . . . . . . . . . . . . . . . . . . . . . . . . .          (2,021)        (2,166)
   Deficit accumulated during the development stage. . . . . . . . . . . .         (47,511)       (45,626)
                                                                                   -------        -------

 Total stockholders' equity. . . . . . . . . . . . . . . . . . . . . . . .          22,117         18,676
                                                                                   -------        -------

                                                                                   $38,834        $26,139
                                                                                   -------        -------
                                                                                   -------        -------
</TABLE>

 
THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE CONDENSED CONSOLIDATED
FINANCIAL STATEMENTS. 

(1)  THE BALANCE SHEET AT DECEMBER 31, 1996 HAS BEEN DERIVED FROM AUDITED
     FINANCIAL STATEMENTS AT THAT DATE, BUT DOES NOT INCLUDE ALL OF THE 
     INFORMATION AND FOOTNOTES REQUIRED BY GENERALLY ACCEPTED FINANCIAL 
     PRINCIPLES FOR COMPLETE FINANCIAL STATEMENTS.


<PAGE>


                              CV THERAPEUTICS, INC.
                          (A DEVELOPMENT STAGE COMPANY)

                 CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS

                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
                                   (UNAUDITED)


<TABLE>
<CAPTION>
                                                                                                                INCEPTION
                                                                               THREE MONTHS ENDED MARCH 31,   (DECEMBER 11,
                                                                               ----------------------------      1990) TO
                                                                                      1997           1996     MARCH 31, 1997
                                                                                      ----           ----     --------------
<S>                                                                            <C>               <C>          <C>
 Contract revenues . . . . . . . . . . . . . . . . . . . . . . . . . . . .            $820             $_         $1,070
 Operating expenses:
   Research and development. . . . . . . . . . . . . . . . . . . . . . . .           1,790          2,524         36,508
   General and administrative. . . . . . . . . . . . . . . . . . . . . . .           1,021            691         11,518
                                                                                   -------        -------       --------

 Total operating expenses. . . . . . . . . . . . . . . . . . . . . . . . .           2,811          3,215         48,026
                                                                                   -------        -------       --------

 Loss from operations. . . . . . . . . . . . . . . . . . . . . . . . . . .          (1,991)        (3,215)       (46,956)
 Net interest and other expense. . . . . . . . . . . . . . . . . . . . . .             106           (164)          (532)
                                                                                   -------        -------       --------

 Net loss. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         $(1,885)       $(3,379)      $(47,488)
                                                                                   -------        -------       --------
                                                                                   -------        -------       --------

 Net loss per share. . . . . . . . . . . . . . . . . . . . . . . . . . . .          $(0.30)
                                                                                   -------        
                                                                                   -------        

 Shares used in computing net loss per share . . . . . . . . . . . . . . .           6,346
                                                                                   -------        
                                                                                   -------        
 Pro forma net loss per share. . . . . . . . . . . . . . . . . . . . . . .                         $(0.80)
                                                                                                  -------       
                                                                                                  -------       

 Shares used in computing pro forma net loss per share . . . . . . . . . .                          4,248
                                                                                                  -------       
                                                                                                  -------       

</TABLE>
 

THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE CONDENSED CONSOLIDATED
FINANCIAL STATEMENTS.



<PAGE>

                              CV THERAPEUTICS, INC.
                          (A DEVELOPMENT STAGE COMPANY)

                 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

                                 (IN THOUSANDS)
                                   (UNAUDITED)

<TABLE>
<CAPTION>
                                                                                                                 
                                                                                    THREE MONTHS ENDED           INCEPTION
                                                                                  -----------------------   (DECEMBER 11, 1990)
                                                                                  MARCH 31,      MARCH 31,          TO
                                                                                    1997           1996       MARCH 31, 1997
                                                                                  ---------      --------   -------------------
<S>                                                                               <C>            <C>        <C>
 CASH FLOWS FROM OPERATING ACTIVITIES
 Net loss. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         $(1,885)       $(3,379)      $(47,488)
 Adjustments to reconcile net loss to net cash
   used in operating activities:
   Amortization of deferred compensation . . . . . . . . . . . . . . . . .             145              -            301
     Depreciation and amortization . . . . . . . . . . . . . . . . . . . .             269            278          3,378
     Write off of warrant issued under capital lease . . . . . . . . . . .               -              -            160
     Forgiveness of notes receivable . . . . . . . . . . . . . . . . . . .               -              -            200
     Issuance of stock warrant for legal services received . . . . . . . .               -              -             49
     Issuance of preferred stock and warrant for
       payment of license fee. . . . . . . . . . . . . . . . . . . . . . .               -              -            750
     Change in assets and liabilities:
       Other current assets. . . . . . . . . . . . . . . . . . . . . . . .            (112)            41            223
       Intangible and other assets . . . . . . . . . . . . . . . . . . . .               -              -         (1,434)
       Accounts payable. . . . . . . . . . . . . . . . . . . . . . . . . .            (234)           236            171
       Accrued liabilities . . . . . . . . . . . . . . . . . . . . . . . .            (185)          (289)         1,119
       Accrued rent. . . . . . . . . . . . . . . . . . . . . . . . . . . .              (8)             -            711
       Deferred revenue. . . . . . . . . . . . . . . . . . . . . . . . . .           7,000              -          7,000
                                                                                   -------        -------       --------

 Net cash provided by (used in) operating activities . . . . . . . . . . .           4,990         (3,113)       (34,860)
                                                                                   -------        -------       --------

 CASH FLOWS FROM INVESTING ACTIVITIES
 Purchase of short-term investments. . . . . . . . . . . . . . . . . . . .         (14,073)             -        (69,168)
 Purchase of long-term investments . . . . . . . . . . . . . . . . . . . .          (3,031)             -         (3,031)
 Maturity of short-term investments. . . . . . . . . . . . . . . . . . . .           1,993              -         55,095
 Capital expenditures. . . . . . . . . . . . . . . . . . . . . . . . . . .             (31)             9         (5,381)
 Notes receivable from officers and employees. . . . . . . . . . . . . . .               -              -           (721)
                                                                                   -------        -------       --------

 Net cash provided by (used in) investing activities . . . . . . . . . . .         (15,142)             9        (23,206)
                                                                                   -------        -------       --------

 CASH FLOWS FROM FINANCING ACTIVITIES
 Payments on capital lease obligation. . . . . . . . . . . . . . . . . . .            (304)          (347)        (1,040)
 Borrowings under long-term debt . . . . . . . . . . . . . . . . . . . . .           3,000              -         16,219
 Repayments of long-term debt. . . . . . . . . . . . . . . . . . . . . . .             (15)          (539)        (8,218)
 Proceeds from issuances of common stock
   (and bridge loans subsequently converted into
   common stock), net of repurchases . . . . . . . . . . . . . . . . . . .           5,181              4         17,675
 Proceeds from issuance of warrant . . . . . . . . . . . . . . . . . . . .               -              -          1,359
 Proceeds from bridge loans. . . . . . . . . . . . . . . . . . . . . . . .               -              -          1,198
 Proceeds from issuance of convertible preferred stock . . . . . . . . . .               -          6,889         48,182
 Payments to stockholders to repurchase the
   Company's common stock. . . . . . . . . . . . . . . . . . . . . . . . .               -              -            (24)
                                                                                   -------        -------       --------

 Net cash provided by financing activities . . . . . . . . . . . . . . . .           7,862          6,007         75,351
                                                                                   -------        -------       --------
 Net (decrease) increase in cash and cash equivalents. . . . . . . . . . .          (2,290)         2,903         17,285
                                                                                   -------        -------       --------
 Cash and cash equivalents at beginning of period. . . . . . . . . . . . .          19,575          5,569              -
 Cash and cash equivalents at end of period. . . . . . . . . . . . . . . .         $17,285         $8,472        $17,285
                                                                                   -------        -------       --------
                                                                                   -------        -------       --------
</TABLE>

 
THE ACCOMPANYING NOTES ARE AN INTEGRAL PART OF THESE CONDENSED CONSOLIDATED
FINANCIAL STATEMENTS. 


<PAGE>
                              CV THERAPEUTICS, INC.
                          (A DEVELOPMENT STAGE COMPANY)

                   NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

BASIS OF PRESENTATION

     The accompanying condensed consolidated financial statements of CV 
Therapeutics, Inc. have been prepared in accordance with generally accepted 
accounting principles, are unaudited, except as specifically noted, and 
reflect all adjustments (consisting solely of normal recurring adjustments) 
which are, in the opinion of management, necessary to present fairly the 
financial position and results of operations for the interim periods 
presented.  The results of operations for the three month period ended March 
31, 1997 are not necessarily indicative of the results to be expected for the 
full year.  The financial information included herein should be read in 
conjunction with the Company's financial report on Form 10-K/A for 1996 which 
includes the audited consolidated financial statements and the notes thereto 
for the year ended December 31, 1996.

PRINCIPLES OF CONSOLIDATION

     The consolidated financial statements include the accounts of the Company
and its wholly-owned subsidiary, CV Therapeutics International, which was
incorporated in December 1993 in the Cayman Islands. All significant
intercompany balances have been eliminated. 

REVENUE RECOGNITION

     Contract revenues related to research agreements with noncancelable,
nonrefundable terms and no significant future obligations are recognized upon
execution of the agreements. Milestone payments will be recognized pursuant to
collaborative agreements upon the achievement of specified milestones. 

NET LOSS PER SHARE

     Except as noted below, net loss per share is computed using the weighted
average number of common shares outstanding. Common equivalent shares are
excluded from the computation as their effect is antidilutive, except that,
pursuant to the Securities and Exchange Commission ("SEC") Staff Accounting
Bulletins, common and common equivalent shares issued during the 12-month period
prior to the initial filing of the Company's Registration Statement on Form S-1
at prices below the assumed public offering price have been included in the
calculation as if they were outstanding for all periods presented through 
September 30, 1996 (using the treasury stock method for stock options). 

     Net loss per share information is as follows: 

                                                         THREE MONTHS ENDED
                                                              MARCH 31,
                                                                1996
                                                        ----------------------
                                                        (IN THOUSANDS, EXCEPT
                                                          PER SHARE AMOUNTS)
      Net loss per share. . . . . . . . . . . . . . . .        $(2.02)
      Shares used in computing net loss per share . . .         1,675

     Pro forma per share data is provided to show the calculation on a
consistent basis for the periods presented. It has been computed as described
above, and also gives retroactive effect from the date of issuance to the
conversion of preferred stock which automatically converted to common stock upon
the closing of the Company's initial public offering. 

IMPACT OF RECENTLY ISSUED ACCOUNTING PRONOUNCEMENTS

     In February 1997, the Financial Accounting Standards Board issued 
Statement No. 128, Earnings per Share, which is required to be adopted on 
December 31, 1997. At that time, the Company will be required to change the 
method currently used to compute loss per share and to restate all prior 
periods. The impact is expected to result in no change to loss per share for 
the quarters ended March 31, 1997 and March 31, 1996.

<PAGE>

ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND
     RESULTS OF OPERATIONS

     This Management's Discussion and Analysis of Financial Condition and
Results of Operations and other parts of this report contain forward-looking
statements which involve risks and uncertainties.  The Company's actual results
may differ materially from the results discussed in the forward-looking
statements.  Factors that might cause such a difference include, but are not
limited to, those listed below and those listed in "Risk Factors" in the
Company's Annual Report on Form 10-K/A for the year ended December 31, 1996.

OVERVIEW

     CVT is a development stage biopharmaceutical company focused exclusively on
the application of molecular cardiology to the discovery, development and
commercialization of novel small molecule drugs for the treatment of chronic
cardiovascular disease. Since its inception in December 1990, substantially all
of the Company's resources have been dedicated to research and development. To
date, CVT has not generated any product revenue and does not expect to generate
any such revenues for at least several years. As of March 31, 1997, the Company
had an accumulated deficit of approximately $47.5 million. The Company expects
its sources of revenue, if any, for the next several years to consist of
payments under existing and future corporate partnerships. The process of
developing the Company's products will require significant additional research
and development, preclinical testing and clinical trials, as well as regulatory
approval. These activities, together with the Company's general and
administrative expenses, are expected to result in operating losses for the
foreseeable future. The Company will not receive product revenue unless it or
its collaborative partners complete clinical trials and successfully
commercialize one or more of its products. 

     CVT is subject to risks common to biopharmaceutical companies, including
risks inherent in its research and development efforts and clinical trials,
reliance on collaborative partners, enforcement of patent and proprietary
rights, the need for future capital, potential competition and uncertainty of
regulatory approval. In order for a product to be commercialized, it will be
necessary for CVT and its collaborators to conduct preclinical tests and
clinical trials, demonstrate efficacy and safety of the Company's product
candidates, obtain regulatory clearances and enter into manufacturing,
distribution and marketing arrangements, as well as obtain market acceptance.
There can be no assurance that the Company will generate revenues or achieve and
sustain profitability in the future. 

RESULTS OF OPERATIONS

QUARTER ENDED MARCH 31, 1997 AND 1996

REVENUES.  The Company recognized revenues of $820,000 for the quarter ended
March 31, 1997, in association with the payment of a non-refundable, up-front
fee pursuant to research collaboration and license agreements with Biogen, Inc.
("Biogen") and its wholly-owned subsidiary, Biotech Manufacturing Limited
("Biotech Manufacturing" and together with Biogen the "Biogen Entities").

RESEARCH AND DEVELOPMENT EXPENSES.  The Company's research and development 
expenses decreased to $1.8 million for the quarter ended March 31, 1997, 
compared to $2.5 million for the quarter ended March 31, 1996. The lower 
expenses in 1997 were largely due to a $750,000 license payment to a 
collaborative partner that occurred in 1996 and did not occur again in 1997. 
Under a current license agreement, the Company may be obligated to make 
milestone payments totaling $3.0 million to Syntex (USA), Inc. in 1997 unless 
the Company elects to terminate the agreement. In addition, the Company 
expects research and development expenses to increase significantly over the 
next several years as the Company expands research and product development 
efforts.

GENERAL AND ADMINISTRATIVE EXPENSES.  General and administrative expenses
increased to $1.0 million for the quarter ended March 31, 1997, compared to
$691,000 for the quarter ended March 31, 1996, due to increased legal fees
associated with the negotiation of the agreements with the Biogen Entities and
increased outside services associated with becoming a public company. The
Company expects general and administrative expense to increase in the future due
to an increase in the level of the Company's activities and additional expenses
associated with being a public company.

INTEREST INCOME (EXPENSE) NET.  Interest income (expense), net increased to
$106,000 for the quarter ended March 31, 1997, compared to $(164,000) for the


<PAGE>

quarter ended March 31, 1996, as a result of higher average investment 
balances from the proceeds of the Company's initial public offering and 
payments received in connection with the Company's collaboration and license 
agreements with the Biogen Entities. The Company expects that interest income 
(expense), net will decrease as investment balances decrease due to the 
consumption of cash in operations. 

     The Company records and amortizes over the related vesting periods deferred
compensation representing the difference between the exercise price of options
granted and the deemed fair value of its common stock at the time of grant.
Options generally vest over four years. Deferred compensation of approximately
$2.3 million has been recorded and is being amortized to both research and
development expenses as well as general and administrative expenses over the
related vesting periods (generally four years) of the options granted. 

LIQUIDITY AND CAPITAL RESOURCES

     The Company has financed its operations since inception primarily through
private placements of preferred equity securities, equipment and leasehold
improvement financing, other debt financings and payments under corporate
collaborations. In November 1996, the Company completed an initial public
offering and raised net proceeds of approximately $13.0 million. On March 7,
1997, the Company entered into two research collaboration and license agreements
with the Biogen Entities which together resulted in an upfront payment of $16.0
million, including $5.0 million in cash, a $7.0 million equity investment
consisting of the purchase of 669,857 shares of the Company's Common Stock at
$10.45 per share, and advanced funding of a milestone payment and funding under
a credit facility totaling $4.0 million. In addition, CVT may receive
development milestones, equity investments, funding under a general purpose loan
facility and royalties from any future product sales. As of March 31, 1997, the
Company had received approximately $68.6 million in net proceeds from the sale
of equity securities, and approximately $16.9 million, before repayment, from
loans and equipment and leasehold financings. 

     Cash, cash equivalents and short- and long-term investments at March 31,
1997 totaled $34.4 million compared to $21.6 million at December 31, 1996. The
increase in 1997 was due to the receipt of the upfront payment of $16.0 million
associated with the Company's collaborations with the Biogen Entities. The
Company's funds are currently invested in short- and medium-term, investment
grade, interest-bearing debt obligations. 

     Net cash provided by operating activities for the quarter ended March 
31, 1997 was $5.0 million, compared to $(3.1) million for the quarter ended 
March 31, 1996. The increase in cash provided by operating activities was the 
result of deferred revenue of $7 million recorded in conjunction with the 
upfront payment under the collaboration with the Biogen Entities.

     Through March 31, 1997, the Company had invested approximately $6.1 million
in property and equipment, of which approximately $4.4 million was financed
through equipment and leasehold financings. 

     The Company will require substantial additional funding in order to 
complete its research and development activities and commercialize any 
potential products. The Company currently estimates that its existing 
resources, including payments already received from the Biogen Entities and 
projected interest income, will enable the Company to maintain its current 
and planned operations through 1998. However, there can be no assurance that 
the Company will not require additional funding prior to such time. The 
Company's forecast of the period of time through which its financial 
resources will be adequate to support its operations is a forward-looking 
statement that involves risks and uncertainties, and actual results could 
vary as a result of a number of factors.  The Company's future capital 
requirements will depend on many factors, including scientific progress in 
its research and development programs, the size and complexity of such 
programs, the scope and results of preclinical studies and clinical trials, 
the ability of the Company to establish and maintain corporate partnerships, 
the time and costs involved in obtaining regulatory approvals, the costs 
involved in filing, prosecuting and enforcing patent claims, competing 
technological and market developments, the cost of manufacturing preclinical 
and clinical material and other factors not within the Company's control. 
There can be no assurance that such additional financing to meet the 
Company's capital requirements will be available on acceptable terms or at 
all. Insufficient funds may require the Company to delay, scale back or 
eliminate some or all of its research or development programs, to lose rights 
under existing licenses or to relinquish greater or all rights to product 
candidates at an earlier stage of development or on less favorable terms than 
the Company would otherwise choose or may adversely affect the Company's 
ability to operate as a going concern. If additional funds are raised by 
issuing equity securities, substantial dilution to existing stockholders may 
result. 

<PAGE>

ADDITIONAL FACTORS THAT MAY AFFECT FUTURE RESULTS

     The Company's business, financial condition and results of operations 
are subject to various risks, including those described below and elsewhere 
in this Report.

     The Company is an early stage company and must be evaluated in light of 
the uncertainties and complications present in an early stage 
biopharmaceutical company.  All of the Company products are at an early stage 
of development, and the Company has not generated any product revenue.  In 
addition, the Company has only two products in clinical development, CVT-124 
and Ranolazine. There can be no assurance that clinical trials conducted by 
the Company will demonstrate sufficient safety and efficacy to obtain the 
requisite approvals or that marketable products will result. In addition, the 
rate of completion of clinical trials may be delayed by many factors. The 
Company's product candidates will require significant additional development, 
preclinical studies, clinical trials and regulatory approval prior to 
commercialization. These activities may take several years and require the 
expenditure of substantial resources. In addition, these activities, together 
with the Company's general and administrative expenses, are expected to 
result in operating losses for the foreseeable future.

     The Company's strategy for the research, development and 
commercialization of its product candidates has required, and will continue 
to require, the Company to enter into various arrangements with corporate and 
academic collaborators, licensors, licensees and others, and the Company is 
dependent upon the success of these parties in performing their 
responsibilities. There can be no assurance that the Company will be able to 
enter into additional collaborative arrangements or license agreements on 
acceptable terms, or at all, or that the contemplated benefits from any of 
these agreements will be realized.

     The Company's business is affected by other factors, including: 
uncertainty of market acceptance, intense competition and rapid technological 
change, uncertainty of patent position and proprietary rights, dependence on 
key personnel and the need to attract and retain key employees and 
consultants, limited manufacturing, marketing and sales experience, 
significant government regulation, uncertainty of product pricing and 
reimbursement, and product liability exposure and the availability of 
insurance.

<PAGE>

Part II Other Information

Item 6. Exhibits and Reports on Form 8-K

     (a) Exhibits

     10.39*  Research Collaboration and License Agreement (U.S.) between 
             the Registrant and Biogen, Inc., dated March 7, 1997.

     10.40*  Research Collaboration and License Agreement (Europe) between
             the Registrant and Biotech Manufacturing Ltd., dated March 7, 1997.

     10.41*  Common Stock Purchase Agreement between the Registrant and 
             Biotech Manufacturing Ltd., dated March 7, 1997.

     10.42*  Loan Agreement between the Registrant and Biotech Manufacturing 
             Ltd., dated March 7, 1997.

     11.1    Computation of Net Loss per Share.

     27.1    Supplemental Financial Data.

     (b) No reports on Form 8-K were filed during the quarter ended March 31, 
         1997.

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

* Confidential treatment is being sought for portions of this exhibit. 
Brackets indicate portions of text that have been omitted. A separate filing 
of such omitted text has been made with the Commission as part of the 
Company's application for confidential treatment.

<PAGE>

                             C.V. Therapeutics, Inc.
                                   Signatures

     Pursuant to the requirements 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.

                                       C.V. Therapeutics, Inc.


Date:          May 15, 1997

                                       By:  /s/ Louis G. Lange, M.D., Ph.D.
                                          --------------------------------------
                                          Louis G. Lange, M.D., Ph.D.
                                          Chairman of the Board & Chief 
                                          Executive Officer
                                          (Principal Executive Officer)

                                       By:  /s/ Kathleen A. Stafford
                                          --------------------------------------
                                          Kathleen A. Stafford
                                          Chief Financial Officer
                                          (Principal Financial and Accounting 
                                          Officer)


<PAGE>
                                                                Exhibit 10.39


Confidential treatment has been requested for portions of this document. 
Brackets indicate portions of text that have been omitted. A separate filing 
of such omitted text has been made with the Commission as part of the 
Company's application for confidential treatment.


                 RESEARCH COLLABORATION AND LICENSE AGREEMENT (U.S.)


    This Agreement is made and entered into this 7th day of March, 1997 by and
between BIOGEN, INC. (hereinafter referred to as "BIOGEN"), a Massachusetts
corporation located at 14 Cambridge Center, Cambridge, MA 02142, and CV
THERAPEUTICS, INC., a Delaware corporation, located at 3172 Porter Drive, Palo
Alto, CA 94304 (hereinafter referred to as "CVT").

    WHEREAS, BIOGEN is a biopharmaceutical company which develops,
manufactures, markets and sells pharmaceutical products for human healthcare;
and

    WHEREAS, CVT is the owner and/or exclusive licensee of certain technology,
patent rights and other proprietary know-how related to PRODUCTS as hereinafter
defined; and

    WHEREAS, BIOGEN desires to obtain an exclusive right and license in and to
such technology, patent rights and proprietary know-how in the TERRITORY as
hereinafter defined; and

    WHEREAS, BIOGEN desires to support additional research related to PRODUCTS;
and

    WHEREAS, CVT is willing to grant the exclusive right and license desired by
BIOGEN and to participate in the conduct of research supported by BIOGEN; and

    WHEREAS, CVT is granting an exclusive right and license in and to such
technology, patent rights and proprietary know-how outside the TERRITORY to
Biotech Manufacturing Limited ("BML") pursuant to a Research Collaboration and
License Agreement (Europe) of even date herewith (the  "BML AGREEMENT") .

    NOW, THEREFORE, in consideration of the mutual promises and other good and
valuable consideration, the parties agree as follows:

SECTION 1.    DEFINITIONS.

    The terms used in this Agreement have the following meaning:

    1.1  The term "Adenosine A(1) Antagonist" shall mean a molecule that 
[  *  ] compound being referred to herein as  a "Test Compound"), the 
[  *  ], and such Test Compound meets the following specifications measured 
concurrently in a validated in vitro assay:

         (I)  [  *  ]

- --------------------------
 * Confidential treatment requested.

                                       1.

<PAGE>

         (II) [  *  ]

    Notwithstanding the foregoing, if CVT is able to establish in a model 
reasonably acceptable to BIOGEN that the principal activity of a Test 
Compound IN VIVO is as [  *  ] such Test Compound shall be excluded from the 
definition of Adenosine A(1) Antagonists.

    1.2  The term "AFFILIATE" as applied to either party shall mean any 
company or other legal entity other than the party in question, in whatever 
country organized, controlling, controlled by or under common control with 
that party. The term "control" means ownership or control, directly or 
indirectly, of at least fifty percent (50%) of the outstanding stock or 
voting rights or the right to elect or appoint a majority of the directors.

    1.3  The term "first AGREEMENT YEAR" shall mean the twelve month period 
commencing on the EFFECTIVE DATE.  With respect to any year after the first 
AGREEMENT YEAR, the term "AGREEMENT YEAR" shall mean the twelve month period 
commencing upon an anniversary of the Effective Date.

    1.4  The term "BIOGEN CVT-124 TECHNOLOGY" shall mean any information, 
data (including all chemical, pharmacological, toxicological, clinical, 
assay, manufacturing and control information, data and test results, 
including negative results), ideas, concepts, formulas, trade secrets, 
methods, procedures, designs, materials, compositions, plans, diagrams, 
applications, specifications, techniques, records, practices, processes, 
research, know-how, inventions, discoveries and the like first conceived and 
first reduced to practice by BIOGEN or its AFFILIATES in the performance of 
any of its work under or pursuant to this Agreement which are necessary or 
useful for the manufacture or use of CVT-124 or other PRODUCTS.  

    1.5  The term "BIOGEN CVT-124 PATENTS" shall mean all patents and pending 
patent applications (which for purposes of this Agreement shall be deemed to 
include certificates of invention and applications for certificates of 
invention and priority rights, provisional patent applications, statutory 
invention registrations, applications for statutory invention registrations, 
and any foreign equivalents thereof) owned by BIOGEN or its AFFILIATES 
throughout the TERRITORY which claim the BIOGEN CVT-124 TECHNOLOGY or any 
part thereof, including any provisional applications, substitutions, 
extensions, reissues, reexaminations, renewals, continuations, 
continuations-in-part, divisionals and supplemental protection certificates. 


- --------------------------
 * Confidential treatment requested.


                                       2.

<PAGE>

    1.6  The term "CALENDAR QUARTER" shall mean the period of three (3) 
consecutive calendar months ending on March 31, June 30, September 30 or 
December 31, as the case may be.

    1.7  The term "CVT-124" shall mean the [  *  ] of epoxy norbornyl 
xanthine as defined as CVT-124 in the IND filed on September 20, 1995 and as 
further described in U.S. Patent Application Serial No. [  *  ].

    1.8  The term "CVT PATENT RIGHT(S)" shall mean all patents and pending 
patent applications (which for purposes of this Agreement shall be deemed to 
include certificates of invention and applications for certificates of 
invention and priority rights, provisional patent applications, statutory 
invention registrations, applications for statutory invention registrations, 
and any foreign equivalents thereof) throughout the TERRITORY that claim CVT 
TECHNOLOGY or any part thereof, including any provisional applications, 
substitutions, extensions, reissues, reexaminations, renewals, continuations, 
continuations-in-part, divisionals and supplemental protection certificates, 
which CVT owns (in whole or in part) or to which CVT otherwise has a 
transferable right as of the EFFECTIVE DATE or at any time during the term of 
this Agreement, including but not limited to CVT's rights in any RESEARCH 
PATENT RIGHTS and CVT's rights obtained under the UFRFI LICENSE.   CVT PATENT 
RIGHTS as of the EFFECTIVE DATE are set forth in APPENDIX A hereto.

    1.9  "CVT TECHNOLOGY" shall mean any information, data (including all 
chemical, pharmacological, toxicological, clinical, assay, manufacturing and 
control information, data and test results, including negative results), 
ideas, concepts, formulas, trade secrets, methods, procedures, designs, 
materials, compositions, plans, diagrams, applications, specifications, 
techniques, records, practices, processes, research, know-how, inventions, 
discoveries and the like which CVT owns (in whole or in part) or to which CVT 
otherwise has a transferable right as of the EFFECTIVE DATE or at any time 
during the term of this Agreement, which relate to CVT-124 or any other 
Adenosine A(1) Antagonist, including but not limited to CVT's rights in the 
RESEARCH INFORMATION, the RESEARCH MATERIALS and the RESEARCH INVENTIONS, and 
CVT's rights under the UFRFI LICENSE.

    1.10 The term "EFFECTIVE DATE" shall mean March 10, 1997.

    1.11 The term "FTE" shall mean the equivalent of a full year of effort on 
a full time basis of a scientist or other professional possessing skills and 
experience necessary to carry out applicable tasks under the RESEARCH PROGRAM.

    1.12 The term "FIRST COMMERCIAL SALE" shall mean the initial transfer by 
BIOGEN or any of its AFFILIATES or SUBLICENSEES of a PRODUCT to a 


- --------------------------
 * Confidential treatment requested.


                                       3.

<PAGE>

THIRD PARTY in exchange for consideration, following marketing approval by 
the appropriate governmental agency for the country in which the transfer is 
made.

    1.13 The term "MAA" shall mean an application for regulatory approval to 
sell  PRODUCT in the European Union and similar in purpose to an NDA in the 
United States.

    1.14 The term "MAJOR MARKET" shall mean the United States.

    1.15 The term "NDA" shall mean a New Drug Application or Product License 
Application or equivalent filing filed for PRODUCT with the U.S. Food and 
Drug Administration ("FDA").

    1.16 The term "NDR" shall mean an application for regulatory approval to 
sell PRODUCT in Japan and similar in purpose to an NDA in the United States.

    1.17 The term "NET SALES" shall mean the [  *  ] of BIOGEN and its 
AFFILIATES with respect to the sale of PRODUCT, less: 

         (i)  trade, quantity, cash or other discounts [  *  ] allowed not 
exceeding amounts customary in the trade, including, without limitation, 
governmental program discounts and rebates (e.g., Medicaid, Medicare, VA, 
etc.)

         (ii)  sales taxes, tariff duties and/or use taxes directly imposed 
on and with reference to particular sales;

         (iii)  packing, transportation and insurance prepaid or allowed; and

         (iv)  amounts allowed or credited on rejects, returns or retroactive 
price reductions.

A sale or transfer of PRODUCT by BIOGEN to an AFFILIATE for re-sale of 
PRODUCT by such AFFILIATE shall not be considered a sale for the purpose of 
this provision but the resale of PRODUCT by such AFFILIATE to a THIRD PARTY 
shall be a sale for such purposes.  A "sale" shall mean a transfer or other 
disposition for consideration, but shall not include transfers or 
dispositions at no cost for pre-clinical, clinical, regulatory or 
governmental purposes or disposition of PRODUCT at no cost for promotional 
purposes.  

    In the event that PRODUCT is sold in the form of  a combination product
containing one or more active ingredients or components in addition to CVT-124
or, if applicable, another Adenosine A(1) Antagonist, NET SALES shall be
determined by multiplying NET SALES of the combination product (as defined by
reference to the 

- --------------------------
 * Confidential treatment requested.

                                       4.

<PAGE>

standard NET SALES definition) during the applicable payment period by the 
fraction A/A+B where A is the average sale price of PRODUCT when sold 
separately in finished form and B is the average sale price of the other 
active ingredients or components when sold separately in finished form in 
each case during the applicable payment period in the country in which the 
sale of the combination product was made, or if sales of both the PRODUCT and 
the other active ingredients or components did not occur in such period, then 
in the most recent payment period in which sales of both occurred.  In the 
event that such average sale price cannot be determined for both PRODUCT and 
all other active ingredients or components included in the combination 
product, NET SALES for purposes of determining payments under this Agreement 
shall be calculated by multiplying the NET SALES of the combination product 
by the fraction C/C+D where C is the fair market value of the CVT-124 (or 
other Adenosine A(1) Antagonist) contribution to the combination and D is the 
sum of the fair market values of all other active components or ingredients 
included in the combination product, in each case, as determined by BIOGEN in 
good faith. 

    1.18 The term "OPERATING COMMITTEE" shall have the meaning set forth in 
Section 7.1 of this Agreement.

    1.19 The term "PHASE II PERFORMANCE ASSESSMENT STUDY" shall mean a Phase 
II study of intravenous CVT-124 in patients with [  *  ] congestive heart 
failure (CHF). The study will be designed to demonstrate as a primary 
endpoint, [  *  ] The study design may be optimized by BIOGEN as additional 
data is gathered from other trials.

    1.20 The term "PHASE III TRIAL" shall mean a randomized clinical trial 
designed to show efficacy and safety of a PRODUCT and intended to be 
submitted as part of the application for marketing approval of such PRODUCT.

    1.21 The term "PRODUCT" shall mean any article, composition or material 
that comprises, contains or is CVT-124 or another Adenosine A(1) Antagonist, 
the manufacture, import, use or sale of which is covered by a VALID CLAIM of 
the CVT PATENT RIGHTS or includes any of the CVT TECHNOLOGY.

    1.22 The term "RESEARCH INFORMATION" shall mean any data, results, 
formulas, process information or other information which results from the 
RESEARCH PROGRAM.

- --------------------------
 * Confidential treatment requested.

                                       5.

<PAGE>

    1.23 The term "RESEARCH INVENTION(S)" shall mean any invention, know-how, 
method, process, use, article of manufacture, or composition of matter 
conceived or first actually or constructively reduced to practice as part of 
the RESEARCH PROGRAM or which results from the RESEARCH PROGRAM.

    1.24 The term "RESEARCH MATERIAL" shall mean any material, reagent or 
substance which results from the RESEARCH PROGRAM.

    1.25 The term "RESEARCH PATENT RIGHT(S)" shall mean all patents and 
patent applications throughout the TERRITORY that claim RESEARCH INFORMATION, 
RESEARCH INVENTIONS or RESEARCH MATERIAL or any part thereof, including any 
provisional applications, substitutions, extensions, reissues, 
reexaminations, renewals, continuations, continuations-in-part, divisionals 
and supplemental protection certificates, statutory invention registrations, 
applications for statutory invention registrations, and any foreign 
equivalents thereof.

    1.26 The term "RESEARCH PLAN" shall mean the written descriptions of the 
research and development to be performed by CVT as part of the RESEARCH 
PROGRAM for the first AGREEMENT YEAR and for each subsequent AGREEMENT YEAR 
of the RESEARCH PROGRAM as approved in accordance with Section 8.2.

    1.27 The term "RESEARCH PROGRAM" shall have the meaning set forth in 
Section 8.1 of this Agreement.    

    1.28 The term "SUBLICENSE INCOME" shall mean any royalties or other 
consideration received by a party hereto from any SUBLICENSEES in respect of 
sales of PRODUCTS, excluding amounts paid to such party for research or other 
services conducted by such party, for clinical trials, for purchases of 
PRODUCTS or of other goods or products at fair market value, or for equity 
investments at fair market value in such party.

    1.29 The term "SUBLICENSEE" shall mean any non-AFFILIATE third party 
expressly licensed by BIOGEN to make, have made or formulate any PRODUCT and 
to sell the PRODUCT made or formulated.  A SUBLICENSEE shall not include a 
distributor or other party licensed to sell PRODUCT but not to make, have 
made or formulate PRODUCT.

    1.30 The term "TERRITORY" shall mean the United States, including Puerto 
Rico, Guam and all other territories of the United States, and all other 
countries and territories in North America and South America.

                                       6.

<PAGE>

    1.31 The term "THIRD PARTY(IES)" shall mean a person or entity who or 
which is neither a party hereto nor an AFFILIATE or SUBLICENSEE of a party 
hereto.

    1.32 The term "UFRFI LICENSE" shall mean a certain License Agreement 
dated as of June 27, 1994 by and between CVT and University of Florida 
Research Foundation, Inc. ("UFRFI"), as amended.

    1.33 The term "VALID CLAIM" shall mean (i) a claim of a pending patent 
application which claim shall not have been canceled, withdrawn, abandoned or 
rejected by an administrative agency from which no appeal can be taken and 
which application shall not have been pending for more than [  *  ] or (ii) a 
claim of an issued and unexpired patent which has not lapsed or become 
abandoned or been declared invalid or unenforceable by a court of competent 
jurisdiction or an administrative agency from which no appeal can be or is 
taken.

    1.34 The use herein of the plural shall include the singular, and the use 
of the masculine shall include the feminine.

SECTION 2.    GRANT AND OTHER RIGHTS.

    2.1  CVT hereby grants to BIOGEN and BIOGEN hereby accepts from CVT an 
exclusive, royalty-bearing right and license under the CVT TECHNOLOGY and CVT 
PATENT RIGHTS to make, have made, import, use, offer for sale and sell 
PRODUCTS in the TERRITORY.  CVT shall be responsible for paying any royalty 
obligations which CVT may have to any THIRD PARTY under agreements between 
CVT and such THIRD PARTIES in effect as of the EFFECTIVE DATE arising from 
the exercise of the license grant set forth above.

    2.2  (a)  AFFILIATES. BIOGEN shall have the full and unrestricted right 
to extend the license granted to it herein to AFFILIATES.  BIOGEN shall 
advise CVT of any such extension to AFFILIATES.

         (b)  SUBLICENSES. BIOGEN shall have the right to grant sublicenses 
in the TERRITORY under the license granted to it herein in accordance with 
the following:

    BIOGEN shall have the full and unrestricted right to grant sublicenses at 
any time after the [  *  ] for such PRODUCT, but may not grant a sublicense 
prior to that time.

    BIOGEN agrees to forward to CVT a copy of any sublicense agreements 
within thirty (30) days of the execution of such sublicense agreements and 
further agrees to 

- --------------------------
 * Confidential treatment requested.

                                       7.

<PAGE>

forward to CVT annually a copy of such reports received by BIOGEN from its 
sublicensees during the preceding twelve (12) month period under the 
sublicenses as shall be pertinent to a royalty accounting under said 
sublicense agreements.

    2.3  To the extent CVT PATENT RIGHTS or CVT TECHNOLOGY licensed to BIOGEN 
under this Agreement are rights which CVT has licensed from UFRFI under the 
UFRFI LICENSE, BIOGEN and CVT understand and agree that the rights licensed 
to BIOGEN by CVT are subject to the terms of the UFRFI LICENSE.

SECTION 3.    INTENTIONALLY OMITTED.

SECTION 4.    MANUFACTURE AND SUPPLY OF PRODUCT; CONDUCT OF CLINICAL TRIALS; 
TECHNOLOGY TRANSFER.

    4.1  PRODUCT SUPPLY.  BIOGEN and its AFFILIATES shall be responsible for 
the manufacture and supply of PRODUCT hereunder for clinical trials and 
commercial sales in the TERRITORY.  Notwithstanding the foregoing, within 
thirty (30) days of the Effective Date, CVT shall deliver to BIOGEN CVT's 
existing inventory of CVT-124 as described in Appendix C, along with copies 
of all quality control release test results and other relevant documentation 
relating to such inventory.  In addition, upon BIOGEN's request, CVT shall 
[  *  ] the manufacturing contract, dated December 2, 1996, between CVT and 
the [  *  ]

    4.2  COLLABORATION.  CVT's representatives on the OPERATING COMMITTEE 
shall work with BIOGEN to establish programs to optimize the chemical 
manufacturing process for PRODUCT.

    4.3  CLINICAL PROGRAMS.  BIOGEN will, at its sole expense, be responsible 
for the worldwide design and conduct of all pre-clinical, clinical, 
development and regulatory work under this Agreement for PRODUCTS being 
developed for sale hereunder and under the BML AGREEMENT, with input from CVT 
through its representation on the OPERATING COMMITTEE and the Strategy 
Committee. Notwithstanding the foregoing, CVT shall lead the protocol design 
and selection of key investigators for the following clinical studies which 
are in the planning stages as of the Effective Date, subject to BIOGEN's 
guidance and right of final approval:

         (i)  Phase II clinical trial of intravenous CVT-124 for [  *  ]

         (ii)  Phase II clinical trial of intravenous CVT-124 for protection 
against [  *  ] at BIOGEN's option; and

- --------------------------
 * Confidential treatment requested.

                                       8.

<PAGE>

         (iii)  Phase I [  *  ] study.

    Protocols for the above clinical trials shall be approved by the 
OPERATING COMMITTEE, as defined below, as soon as possible after the 
Effective Date.

    4.4  TRANSFER OF CVT TECHNOLOGY.  From and after the Effective Date, CVT 
shall make available sufficient personnel and resources to accomplish the 
swift and orderly transfer of copies and/or samples, as the case may be, of 
all CVT Technology to Biogen.

    4.5  [  *  ] REGULATORY FILINGS.  CVT [  *  ] all INDs and other regulatory
filings relating to CVT-124.  CVT shall promptly deliver copies of such 
filings to BIOGEN and [  *  ] of such filings.  CVT and BIOGEN shall 
cooperate in [  *  ] in such a way as not to harm either CVT's or BIOGEN's 
relationship with the relevant regulatory authorities.  To that end, BIOGEN 
may elect to have one or more of CVT's employees participate in meetings 
between BIOGEN and regulatory authorities [  *  ] CVT's regulatory filings.  

    4.6  CLINICAL CONTRACTS, TRANSFER OF CLINICAL DATABASE. The transition of 
planning for the conduct of planned clinical trials of CVT-124 shall proceed 
in accordance with Appendix B.  If BIOGEN elects to enter into contracts with 
the parties with whom CVT has been negotiating, whether or not upon the terms 
previously negotiated by CVT, CVT shall provide its full cooperation, as 
requested by BIOGEN.  CVT shall, within five (5) days after the EFFECTIVE 
DATE, provide BIOGEN with a full and complete copy, including all raw data, 
of [  *  ] In addition, upon BIOGEN's request, CVT shall provide to BIOGEN 
all of the original Case Report Forms from  such study.

SECTION 5.    DUE DILIGENCE.

    5.1  PRODUCT DEVELOPMENT.  BIOGEN shall use commercially reasonable 
efforts to develop and market a PRODUCT, which efforts shall be at least 
commensurate with those efforts undertaken in BIOGEN's own internal programs 
with the same profit potential and risk.  

    5.2  [  *  ]  BIOGEN shall use commercially reasonable efforts 
to develop a PRODUCT for [  *  ] which efforts shall be at least 
commensurate with those efforts undertaken in BIOGEN's own internal programs 
with the same profit potential and risk.  Subject to technical and regulatory 
delays, BIOGEN will use commercially reasonable efforts to meet the following 
development timeline:

- --------------------------
 * Confidential treatment requested.

                                       9.

<PAGE>

         (I)   Within [  *  ] of the successful completion of a [  *  ] BIOGEN 
shall [  *  ]

         (II)  Within [  *  ] of commencing [  *  ] BIOGEN shall commence  a 
Phase I trial of such PRODUCT; and

         (III) Within [  *  ] of the successful completion of [  *  ] 
BIOGEN shall make its decision to commence a [  *  ] of such PRODUCT.

    Provided that BIOGEN has used commercially reasonable efforts as 
aforesaid, failure to meet the foregoing timeline shall not constitute a 
breach of this Agreement, or result in any limitation on the licenses and 
rights granted to BIOGEN pursuant to this Agreement.

    5.3  STATUS REPORTS.  Within sixty (60) days of the end of each calendar 
year during the term hereof, BIOGEN shall provide to CVT a written report 
summarizing the status of BIOGEN's development efforts hereunder and the 
results of the prior year's efforts.

SECTION 6.    CONFIDENTIALITY AND INFORMATION.

    6.1  During the term of this Agreement, it is contemplated that each 
party may disclose to the other, proprietary and confidential technology, 
inventions, technical information, material, reagents, biological materials 
and the like which are owned or controlled by the party providing such 
information or which that party is obligated to maintain in confidence 
("Confidential Information"). Each party shall have the right to refuse to 
accept the other party's Confidential Information.  Each party agrees not to 
disclose and to maintain the Confidential Information of the other party in 
strict confidence, to cause all of its agents, representatives and employees 
to maintain the disclosing party's Confidential Information in confidence and 
not to disclose any such Confidential Information to a third party without 
the prior written consent of the disclosing party and not to use such 
Confidential Information for any purpose other than as licensed under this 
Agreement.

    6.2  The obligations of confidentiality will not apply to information 
which:

         (i)  was known to the receiving party or generally known to the 
public prior to its disclosure hereunder through no fault of the receiving 
party or any agent, representative or employee thereof; or

- --------------------------
 * Confidential treatment requested.

                                       10.

<PAGE>

         (ii)  subsequently becomes known to the public by some means other 
than a breach of this Agreement, including publication and/or laying open to 
inspection of any patent applications or patents;

         (iii)  is subsequently disclosed to the receiving party by a third 
party having a lawful right to make such disclosure and who is not under an 
obligation of confidentiality to the disclosing party;

         (iv)  is approved for release by the parties. 

    6.3  The obligations of Section 6.1 notwithstanding, BIOGEN may disclose 
the Confidential Information of CVT licensed to BIOGEN hereunder (a) to 
SUBLICENSEES and (b) to THIRD PARTIES who (i) need to know the same in order 
to secure regulatory approval for the sale of PRODUCT, (ii) who need to know 
the same in order to work towards the commercial development of PRODUCT or to 
manufacture PRODUCT, or (iii) who are approved by CVT, provided that such 
parties, other than regulatory authorities, are bound by obligations of 
confidentiality and non-use at least as stringent as those set forth herein. 
Further, either party may disclose Confidential Information of the other 
party to the extent such disclosure is required by law, rule, regulation or 
bona fide legal process to be disclosed, provided that the receiving party 
takes all reasonable steps to restrict and maintain confidentiality of such 
disclosure and provides reasonable notice to the disclosing party.

    6.4  CVT shall provide to BIOGEN, or if required to the applicable 
regulatory authority, all documents and information, to the extent in CVT's 
possession or otherwise reasonably accessible to CVT with the right to 
disclose, requested by the regulatory authority or reasonably requested by 
BIOGEN in support of BIOGEN's regulatory submissions.  Copies of all 
documents provided directly to a regulatory authority shall be provided to 
BIOGEN in advance, if practicable, or otherwise within [  *  ] of 
delivery to the regulatory authority.  In addition, CVT shall provide to 
BIOGEN any information, to the extent in CVT's possession or otherwise 
reasonably accessible to CVT with the right to disclose, related to PRODUCT 
that is (a) reasonably required in support of BIOGEN's applications to patent 
offices and such governmental offices as regulate the price of PRODUCT and/or 
(b) reasonably required to support a legal action by BIOGEN against a THIRD 
PARTY.

    6.5  Neither party may disclose the existence or terms of this Agreement
without the prior written consent of the other party; provided, however, that
either party may make such disclosure to the extent required by law.   The
parties have approved an initial press release as set forth in APPENDIX D
attached hereto.  Once any written statement is approved for disclosure by both
parties, either party may make 

- --------------------------
 * Confidential treatment requested.

                                       11.

<PAGE>

subsequent public disclosure of the contents of such statement without the 
further approval of the other party.

SECTION 7.    GOVERNANCE.

    7.1  OVERALL RESPONSIBILITY.

         (a)  Overall direction of the parties' strategic alliance under this 
Agreement and the BML AGREEMENT will be provided by an Oversight Committee 
consisting of an equal number of senior management representatives from each 
party.  The Oversight Committee will meet on an ad hoc basis during the term 
of this Agreement to monitor the overall performance of the collaboration 
hereunder and to resolve any disputes which may arise regarding the operation 
of the collaboration, such resolution to be within a reasonable period of 
time under the relevant circumstances, in any event not to exceed [  *  ]

         (b)  The following committees shall also be established under this 
Agreement as set forth below.  

              (i)  the OPERATING COMMITTEE; and

              (ii) the Strategy Committee.

    7.2  OPERATING COMMITTEE.  An OPERATING COMMITTEE (a/k/a, the "CVT-124 
Development Team") shall be established by BIOGEN to manage the worldwide 
development of PRODUCTS.  The activities of the RESEARCH PROGRAM, described 
hereinafter in Section 8, will also be overseen and monitored by the 
OPERATING COMMITTEE.

         (a)  MEMBERSHIP.  Within ten (10) days of the date hereof, CVT shall 
designate up to [  *  ] representatives to serve on the OPERATING COMMITTEE. 
Additional representatives of CVT may attend OPERATING COMMITTEE meetings on 
an as needed basis with the prior approval of BIOGEN, such approval not to be 
unreasonably withheld.  CVT will have the right to change its representation 
on the OPERATING COMMITTEE upon written notice to BIOGEN.  BIOGEN 
representatives on the OPERATING COMMITTEE shall include representatives of 
all relevant line functions, as determined by BIOGEN.

         (b)  CHAIR.  The OPERATING COMMITTEE chair (a/k/a "Program 
Executive") shall be designated by BIOGEN.

- --------------------------
 * Confidential treatment requested.

                                       12.

<PAGE>

         (c)  RESPONSIBILITIES.  The OPERATING COMMITTEE will have authority to
take and perform all actions necessary to accomplish its responsibilities,
including but not limited to, authority to:

              (i)  oversee and manage the day-to-day development of PRODUCTS;

              (ii) oversee the RESEARCH PROGRAM, and monitor performance
thereunder;

              (iii)     coordinate programs to optimize the chemical
manufacturing process;

              (iv) review and propose RESEARCH PLANS and budgets; and

              (v)  review any and all proposed publications or communications
relating to the RESEARCH PROGRAM and the results therefrom, in accordance with
the procedure set forth in Section 8.

         (d)  MEETINGS.  The OPERATING COMMITTEE will meet not less than
monthly.  Meetings will be held at BIOGEN's premises or such other place as may
be mutually agreed upon.  CVT representatives may participate in person or by
telephone.  In the event of disagreement, [  *  ]

    7.3  STRATEGY COMMITTEE.  A Strategy Committee will be established which 
will meet as needed to set worldwide clinical, regulatory and marketing 
strategies for PRODUCTS.  CVT may designate up to four (4)  representatives 
who may participate in meetings of the Strategy Committee in person or by 
telephone. Additional representatives of CVT may attend Strategy Committee 
meetings on an as needed basis with the prior approval of BIOGEN, such 
approval not to be unreasonably withheld.  In the event of disagreement, 
[  *  ]

SECTION 8.    RESEARCH PROGRAM.

    8.1  OBJECT.  CVT shall conduct a program of research in accordance with 
annual RESEARCH PLANS established in accordance with Section 8.2 (the 
"RESEARCH PROGRAM").  The objectives of the RESEARCH PROGRAM shall be first 
to [  *  ] of CVT-124, and thereafter to explore [  *  ] CVT-124, to 
identify [  *  ] CVT agrees to conduct and manage

- --------------------------
 * Confidential treatment requested.

                                       13.

<PAGE>

the RESEARCH PROGRAM pursuant to the RESEARCH PLAN and BIOGEN agrees to support 
such RESEARCH PROGRAM at CVT in accordance with the terms and conditions set
forth below.  

    8.2  (a)  DEFINITION OF PHASES OF RESEARCH PROGRAM.   The RESEARCH 
PROGRAM shall be divided into two phases.  Phase 1 of the RESEARCH PROGRAM 
shall begin with the EFFECTIVE DATE and end at such time that a [  *  ] by 
either party.  Phase 2 of the RESEARCH PROGRAM shall commence after the 
completion of Phase 1 and continue for as long as the RESEARCH PROGRAM is in 
effect.

         (b)  CONDUCT OF PHASE 1 OF  THE RESEARCH PROGRAM.  The RESEARCH PLAN 
and budget for Phase 1 of the RESEARCH PROGRAM is attached hereto as Appendix 
E. CVT will use commercially  reasonable  efforts to perform the RESEARCH 
PLAN for Phase 1 of  the RESEARCH PROGRAM in accordance with the agreed-upon 
schedule and budget contained in Appendix E.  Such budget includes the number 
of FTEs to be devoted to the RESEARCH PROGRAM during each  AGREEMENT YEAR 
during Phase 1 (at [  *  ] per FTE), together with a breakdown of any other 
fees and expenses to be incurred, and totals [  *  ] per year.

         (c)  CONDUCT OF PHASE 2 OF  THE RESEARCH PROGRAM.    The RESEARCH 
PLAN and budget for Phase 2 of the RESEARCH PROGRAM shall be approved by the 
parties at least ninety (90) days prior to the beginning of Phase 2 and at 
least ninety (90) days prior to the beginning of each AGREEMENT YEAR 
commencing during Phase 2.  CVT will use commercially reasonable  efforts to 
perform the RESEARCH PLAN during Phase 2 of the RESEARCH PROGRAM in 
accordance with the agreed-upon schedule and budget.

         (d)  EXCHANGE OF INFORMATION AND REPORTS.  To further the efforts of 
the parties under this Agreement, CVT shall promptly disclose to BIOGEN any 
RESEARCH INVENTIONS arising out of the RESEARCH PROGRAM, but in any event 
within [  *  ] for potentially patentable, significant RESEARCH INVENTIONS, 
and within [  *  ] of the end of each CALENDAR QUARTER for all others. CVT 
shall keep BIOGEN and the OPERATING COMMITTEE reasonably informed of its 
progress in the RESEARCH PROGRAM and shall deliver reasonably detailed 
written progress reports to BIOGEN semi-annually.

         (e)  VISITATION.  For the purpose of facilitating the parties 
understanding of the research and development activities conducted hereunder, 
CVT will permit duly authorized employees or representatives of BIOGEN to 
visit its facilities where the 

- --------------------------
 * Confidential treatment requested.

                                       14.

<PAGE>

RESEARCH PROGRAM activities are conducted, at reasonable times and with 
reasonable notice, subject to appropriate confidentiality provisions.

    8.3  SOURCE OF FUNDS.  During the term of the RESEARCH PROGRAM  as 
specified in Section 8.5, CVT will dedicate [  *  ]
in each AGREEMENT YEAR from the proceeds of BML's equity investments in CVT 
to be made pursuant to the BML AGREEMENT to support the conduct of the 
RESEARCH PROGRAM at CVT.  Such funds shall be utilized solely for performance 
of the RESEARCH PROGRAM in accordance with the approved budget.

    8.4  REPORTS [  *  ].  During Phase 1 of the RESEARCH PROGRAM, CVT shall 
prepare annual financial reports of actual and budgeted expenditures under 
the RESEARCH PROGRAM.  BIOGEN [  *  ] provided under the BML AGREEMENT for 
Phase 1 of the RESEARCH PROGRAM in accordance with the approved budget.  The 
[  *  ] in any report from CVT, in which case [  *  ]

    8.5  TERM AND TERMINATION OF THE RESEARCH PROGRAM.  The term of the 
RESEARCH PROGRAM will be the first three (3) AGREEMENT YEARS.  BIOGEN shall 
be entitled to terminate the RESEARCH PROGRAM and BML shall be entitled to 
cease funding thereof in the event of termination of this Agreement or in the 
event of a breach by CVT of any of CVT's material obligations in the RESEARCH 
PROGRAM following written notice of such breach to CVT.  If such breach is 
not cured within [  *  ] after written notice is given by BIOGEN to CVT 
specifying the breach, BIOGEN may terminate the RESEARCH PROGRAM without 
terminating the entire Agreement and BML may cease funding of the RESEARCH 
PROGRAM  forthwith upon written notice to CVT after expiration of such [  *  ]
In the event BIOGEN terminates the RESEARCH PROGRAM as provided above, BIOGEN 
may, at its option, require CVT to repurchase from BML shares of CVT Common 
Stock sold to BML pursuant to the BML AGREEMENT, [  *  ] in an amount equal 
to [  *  ] less the amount of CVT's actual expenditures incurred during the 
AGREEMENT YEAR prior to such termination of the RESEARCH PROGRAM.  In 
addition to BIOGEN's right to terminate the RESEARCH PROGRAM for breach as 
provided above, either BIOGEN or CVT may terminate the RESEARCH PROGRAM 
without terminating the entire Agreement upon [  *  ] written notice 
delivered prior to the commencement of the second AGREEMENT YEAR or the third 
AGREEMENT YEAR; provided, however, that notwithstanding the foregoing, CVT 
may not terminate the RESEARCH  PROGRAM prior to the end of Phase 1 of the 
RESEARCH PROGRAM.

- --------------------------
 * Confidential treatment requested.

                                       15.

<PAGE>

    8.6  THIRD PARTY SUPPORT  CVT shall not apply any of the funding provided 
by BML under the BML AGREEMENT for Phase 1 of the RESEARCH PROGRAM  towards 
R&D to be conducted in whole or in part by a THIRD PARTY without BIOGEN's 
approval, such approval not to be unreasonably withheld or delayed.  CVT may 
apply any of the funding provided by BML under the BML AGREEMENT for Phase 2 
of the RESEARCH PROGRAM towards R&D to be conducted in whole or in party by a 
THIRD PARTY provided that BIOGEN has approved in advance the form of 
agreement to be used in contracting with such THIRD PARTY, such approval not 
to be unreasonably withheld or delayed.

    8.7  CONFIDENTIALITY.  In order to facilitate the operation of the 
RESEARCH PROGRAM, either party may disclose confidential or proprietary 
information owned or controlled by it to the other.  It is hereby understood 
and agreed that such information shall be treated in accordance with Section 
6 hereof.

    8.8  RESULTS OF THE RESEARCH PROGRAM.

         (a)  All right, title and interest in and to any RESEARCH 
INFORMATION, RESEARCH INVENTIONS and RESEARCH MATERIAL (the "RESULTS"), and 
any RESEARCH PATENT RIGHTS based thereon, conceived and reduced to practice 
solely by employees or agents of CVT shall be owned solely by CVT ("CVT 
RESULTS"), subject to the licenses granted to BIOGEN under Section 2 hereof 
and the licenses granted to BML under Section 2 of the BML AGREEMENT.  All 
right, title and interest in or to any RESULTS and any RESEARCH PATENT RIGHTS 
based thereon, conceived and reduced to practice solely by employees or 
agents of BIOGEN shall be owned solely by BIOGEN.  All right, title and 
interest in and to any RESULTS and any RESEARCH PATENT RIGHTS based thereon 
conceived and reduced to practice by employees or agents of CVT and employees 
or agents of BIOGEN shall be owned jointly by CVT and BIOGEN ("JOINT 
RESULTS"), with CVT's ownership interest therein being subject to the 
licenses granted to BIOGEN under Section 2 hereof and the licenses granted to 
BML under Section 2 of the BML AGREEMENT. Invention, conception and reduction 
to practice of RESEARCH INVENTIONS, RESEARCH INFORMATION, RESEARCH MATERIALS, 
and RESEARCH PATENT RIGHTS shall be determined in accordance with United 
States intellectual property laws.

         (b)  There will be no publication of the RESULTS by CVT, or any 
employee of CVT unless the OPERATING COMMITTEE has reviewed the proposed 
scientific publication concerning the RESULTS and each party has consented in 
writing to the publication, which review shall be conducted within [  *  ] of 
submission of the proposed publication to the OPERATING COMMITTEE, and which 
approval shall not be unreasonably withheld or delayed.  CVT will, upon 
request of 

- --------------------------
 * Confidential treatment requested.

                                       16.

<PAGE>

BIOGEN, delay publication for up to [  *  ] to allow for the filing 
of patent applications incorporating RESULTS.

         (c)  Notwithstanding any provision in this Agreement and/or the BML 
AGREEMENT to the contrary, BIOGEN shall have no rights pursuant to Section 2 
hereof, and BML shall have no rights pursuant to Section 2 of the BML 
AGREEMENT to any compounds developed in the RESEARCH PROGRAM that are not 
Adenosine A(1) Antagonists ("Non- A(1) Compounds").  With respect to such 
Non- A(1) Compounds, BIOGEN shall have a right of first refusal as follows: 
CVT shall give written notice to BIOGEN specifying in reasonable detail the 
rights and data, including preclinical data establishing IN VIVO activity,  
relating to Non-A(1) Compounds that CVT has developed (the "Offer").  BIOGEN 
shall have [  *  ] after the date of the Offer to provide a written response 
to CVT (the "Response") as to whether or not BIOGEN wishes to enter into 
negotiations with  CVT with respect to such rights.  If the Response states 
that BIOGEN wishes to enter into negotiations with CVT, the parties shall 
negotiate in good faith the licensing of such rights for a period of [  *  ] 
from the date of the Response. If BIOGEN declines to enter into negotiations 
or if the parties do not agree upon and execute a written agreement within 
the [  *  ] negotiation period, CVT shall deliver to BIOGEN in writing its 
last best offer for licensing such rights.  BIOGEN shall have [  *  ] from 
receipt of CVT's last best offer to accept such offer in writing.  If BIOGEN 
declines to accept CVT's last best offer, CVT shall thereafter have the right 
to negotiate with third parties with respect to such rights; provided, 
however, that the terms of any such definitive agreement with any third party 
shall not be more favorable to the third party than CVT's last best offer to 
BIOGEN.  The foregoing BIOGEN rights shall terminate [  *  ] after the end of 
the RESEARCH PROGRAM.

SECTION 9.    PATENTS.

    9.1  (a)  CVT shall promptly advise BIOGEN, in writing, of each potentially
patentable or otherwise potentially useful RESEARCH INVENTION arising from the
RESEARCH PROGRAM.  Representatives of CVT and BIOGEN shall then discuss whether
a patent application or applications pertaining to such RESEARCH INVENTION
should be filed and in which countries.  The titles, serial numbers and other
identifying data of patent applications claiming a RESEARCH INVENTION to which
BIOGEN is granted rights hereunder and filed after the EFFECTIVE DATE by mutual
agreement of CVT and BIOGEN, or by BIOGEN alone pursuant to the last sentence of
this section or pursuant to subsection (c) hereof, shall be added to APPENDIX A
of this Agreement and to Appendix A of the BML AGREEMENT and CVT's interest
therein shall become CVT PATENT RIGHTS for purposes of both this Agreement and
the BML AGREEMENT. CVT shall file, prosecute and maintain patent applications
and patents worldwide relating to such CVT RESULTS as the parties agree

- --------------------------
 * Confidential treatment requested.

                                       17.

<PAGE>

hereunder, [  *  ] through patent counsel selected by CVT and reasonably 
acceptable to BIOGEN, except  as provided in subsection (c) below. BIOGEN 
shall have the opportunity to provide substantive review and comment on any 
such filing, prosecution and or maintenance and the rights as set forth in 
Section 9.2 below.  In the event CVT declines to prepare, file, prosecute or 
maintain a patent application on a RESEARCH INVENTION, then BIOGEN may 
prepare, file, prosecute and maintain such patent application, in which 
events [  *  ] after the date of its election to assume responsibility for 
such patent application.

         (b)  BIOGEN shall, as of the EFFECTIVE DATE, assume responsibility 
to prepare, file, prosecute and maintain patent applications and patents 
worldwide relating to CVT PATENT RIGHTS identified on Appendix A as of the 
EFFECTIVE DATE and relating to JOINT RESULTS,  and [  *  ] related thereto.  
Notwithstanding the foregoing, CVT shall maintain CVT PATENT RIGHTS for a 
period of 6 weeks from the EFFECTIVE DATE and shall cooperate fully in the 
orderly transfer to BIOGEN's patent counsel of all files and necessary powers 
of attorney related to such CVT PATENT RIGHTS within 4 weeks from the 
EFFECTIVE DATE.  BIOGEN shall also have the option pursuant to subsection (a) 
above to prepare, file, prosecute and maintain patent applications and 
patents worldwide relating to CVT RESULTS that CVT declines to file, 
prosecute and/or maintain, and shall have the option under subsection (c) 
below.

         (c)  BIOGEN shall have the option, commencing at such time as a 
PRODUCT to which RESEARCH PATENT RIGHTS relate enters human clinical trials, 
to assume CVT's responsibility to file, prosecute and maintain patent 
applications and patents worldwide relating to such RESEARCH PATENT RIGHTS in 
which events [  *  ] after the date of its election to assume control of such 
RESEARCH PATENT RIGHTS.

         (d)   The term "Patent Costs" shall mean all reasonable [  *  ] 
incurred for the filing, prosecution, issuance, and maintenance of the 
identified CVT PATENT RIGHTS, but not including the costs of any opposition 
or interference proceedings, which shall [  *  ] BIOGEN shall use patent 
counsel selected by BIOGEN and reasonably acceptable to CVT.  CVT shall have 
the opportunity to provide substantive review and comment on any such filing, 
prosecution and or maintenance and the rights as set forth in Section 9.2 
below.

         (e)  Notwithstanding anything in this Section 9.1 to the contrary, 
BIOGEN may, at its discretion, elect to discontinue financial support of any 
patent 

- --------------------------
 * Confidential treatment requested.

                                       18.

<PAGE>

application for which it is providing support under this Agreement, provided, 
however, that BIOGEN will notify CVT of its intention at least sixty (60) 
days prior to taking such action.  In any country in which BIOGEN has elected 
to discontinue its support of any patent application, CVT, upon receiving 
notice, may elect at its own expense to assume all financial responsibility 
for the prosecution of such patent application; provided, however, that if 
CVT obtains issuance of any such patent application, BIOGEN shall reimburse 
CVT for such expenses.  BIOGEN's determination to [  *  ] with respect to such 
patent application pursuant to [  *  ] hereof or pursuant to [  *  ] of the 
BML AGREEMENT.  

    9.2  With respect to any CVT PATENT RIGHTS, all substantive communication 
to or from the United States Patent and Trademark Office or its equivalent in 
any other jurisdiction, including, but not limited to, each patent 
application, office action, response to office action, amendment, 
restriction, election, request for terminal disclaimer, and request for 
reissue or reexamination of any patent issuing from such application, as well 
as any intention to discontinue prosecution or financial support of any 
patent or patent applications shall be provided to BIOGEN or CVT, as the case 
may be, by the party controlling the prosecution or maintenance sufficiently 
prior to the filing of such document to allow for review and comment by 
BIOGEN or CVT, respectively.  However, BIOGEN and CVT shall have the right to 
take any  action that in its judgment is necessary to preserve such CVT 
PATENT RIGHTS for which it is responsible.  Both parties shall cooperate 
fully to facilitate the preparation, filing, prosecution and maintenance of 
CVT PATENT RIGHTS.  Notwithstanding anything herein to the contrary, neither 
BIOGEN nor CVT shall abandon a CVT PATENT RIGHT or allow a CVT PATENT RIGHT 
to lapse without first giving the other notice of such intention at least 
[  *  ] prior to the date on which such CVT PATENT RIGHT will lapse or become 
abandoned.  BIOGEN or CVT shall have the right to assume the prosecution, 
maintenance and defense of any CVT PATENT RIGHT which the other intends to 
abandon.  If this Agreement terminates for any reason, BIOGEN shall 
immediately thereafter transfer to CVT control of the prosecution and 
maintenance of all CVT PATENT RIGHTS and original copies of all documents 
relating to such CVT PATENT RIGHTS in the possession or control of BIOGEN.

    9.3  (a)  If any of the CVT PATENT RIGHTS under which BIOGEN is licensed 
hereunder, or under which BML is licensed under the BML AGREEMENT,  is 
infringed by a THIRD PARTY's manufacture, import, use, sale or offer to sell 
of CVT-124 or another Adenosine A(1) Antagonist, or a product comprising or 
containing CVT or another Adenosine A(1) Antagonist, BIOGEN shall have the 
right and option but not the obligation to bring an action for infringement, 
at its sole expense, against such THIRD PARTY in the name of CVT or its 
licensors and/or in the name of BIOGEN, 

- --------------------------
 * Confidential treatment requested.

                                       19.

<PAGE>

and to join CVT or its licensors, at BIOGEN's expense,  as a party plaintiff 
if required or if it would promote the success of the litigation. Each party 
shall promptly notify the other party of any such infringement. BIOGEN shall 
keep CVT informed as to the prosecution of any action for such infringement.  
No settlement, consent judgment or other voluntary final disposition of the 
suit which adversely affects CVT PATENT RIGHTS may be entered into without 
the consent of CVT, which consent shall not unreasonably be withheld.

         (b)  In the event that BIOGEN shall undertake the enforcement and/or 
defense of the CVT PATENT RIGHTS by litigation as provided above any recovery 
of damages by BIOGEN for any such suit shall be applied first in satisfaction 
of any unreimbursed expenses and legal fees of BIOGEN relating to the suit.  
The balance remaining from any such recovery shall [  *  ] considering where 
the infringing sales were made.

         (c)  In the event that, and only if, BIOGEN specifically elects not 
to pursue an action for infringement, CVT (or its licensor) shall have the 
right and option, but not the obligation at its cost and expense to initiate 
infringement litigation and [  *  ]

         (d)  In any infringement suit either party may institute to enforce 
the CVT PATENT RIGHTS pursuant to this Agreement, the other party hereto 
shall, at the request of the party initiating such suit, cooperate in all 
respects and, to the extent possible, have its employees testify when 
requested and make available relevant records, papers, information, samples, 
specimens, and the like.  All reasonable out-of-pocket costs incurred in 
connection with rendering cooperation requested hereunder shall be paid by 
the party requesting cooperation.

SECTION 10.   COMPENSATION.

    10.1 (a)  As consideration for research and development already performed 
by CVT with respect to PRODUCTS, upon execution of this Agreement, BIOGEN 
shall pay to CVT a non-creditable, non-refundable payment in the amount of 
Five Million Dollars ($5,000,000).

         (b)  Upon execution of this Agreement, BIOGEN shall pre-pay the 
[  *  ] required to be paid upon the successful completion of a [  *  ] 
pursuant to Section 10.3(a)(ii).  In the event the planned [  *  ] of CVT-124 
is unsuccessful [  *  ] Biogen shall notify CVT in writing, whereupon CVT 
shall refund to Biogen such pre-paid milestone within 

- --------------------------
 * Confidential treatment requested.

                                       20.

<PAGE>

thirty (30) days.  If Biogen shall thereafter successfully complete a [  *  ] 
with another PRODUCT, Biogen shall pay the milestone as provided in Section 
10.3(a)(ii).

    10.2 (a)  BIOGEN shall pay to CVT royalties on NET SALES of PRODUCTS in the
TERRITORY ("Royalties") as follows: 

              (i)  Royalties payable to CVT on NET SALES of PRODUCTS in the 
TERRITORY shall be [  *  ] and determined based on worldwide annual NET 
SALES (i.e., including NET SALES of PRODUCTS under the BML AGREEMENT) in each 
calendar year in accordance with the following table:

      [  *  ]  Annual Net Sales        Royalty
    ------------------------------------------
    Up to [  *  ] Million              [  *  ]

    [  *  ] Million to [  *  ] Million [  *  ]

    Over [  *  ] Million               [  *  ]

              (ii) Notwithstanding subparagraph (i) above, in the event there 
are two consecutive twelve month periods in which worldwide NET SALES exceed 
[  *  ] Million but are less than [  *  ] Million, then, unless subparagraph 
(iii) applies, Royalties shall thereafter be determined based on annual 
worldwide NET SALES in any subsequent calendar year in accordance with the 
following table:

      [  *  ]  Annual Net Sales        Royalty
    ------------------------------------------
    Up to [  *  ] Million              [  *  ]

    [  *  ] Million to [  *  ] Million [  *  ]

              (iii) Notwithstanding subparagraph (ii), if at any time after 
paragraph (ii) applies worldwide NET SALES exceed [  *  ] Million for one 
full twelve month period or are less than [  *  ] Million for one full twelve 
month period, the Royalties owed on NET SALES shall thereafter be determined 
in accordance with subparagraph (i), regardless of the subsequent annual 
overall levels of NET SALES.

              (iv) Royalties shall be payable under this Agreement solely for 
PRODUCT sold in the TERRITORY.  However, for the purposes of determining the 
applicable [  *  ] royalty rate, worldwide annual NET SALES shall be deemed 
to include NET SALES under both this Agreement and the BML AGREEMENT.

- --------------------------
 * Confidential treatment requested.

                                       21.

<PAGE>

         (b)  Notwithstanding the foregoing, if the use or sale of PRODUCT by 
BIOGEN or its AFFILIATES in the country in which the PRODUCT is sold is not 
covered by a VALID CLAIM of a CVT PATENT RIGHT in such country, the Royalties 
payable with respect to NET SALES in such country shall be  [  *  ] of the 
amounts otherwise due pursuant to Section 10.2(a) above; PROVIDED, however, 
that if, in any such country, any one or more THIRD PARTY(S)  is/are selling 
a generic version of the PRODUCT being sold by BIOGEN or its AFFILIATES and 
such THIRD PARTY(S)' sales of such generic product exceeds [  *  ] of 
BIOGEN's sales of the PRODUCT in such country, the Royalties in such country 
shall be reduced to [  *  ] during such period of generic sales.

         (c)  The obligation to pay Royalties for each PRODUCT shall continue 
on a country-by-country and product-by-product basis until the last to expire 
VALID CLAIM of the CVT PATENT RIGHTS in such country covering such PRODUCT; 
provided, however, that in any country in which there is no such VALID CLAIM, 
the obligation to pay Royalties shall continue only until the expiration of 
[  *  ] from the FIRST COMMERCIAL SALE of such PRODUCT in such country 
by BIOGEN or its AFFILIATES or SUBLICENSEES.

         (d)  (i)  In the event that after the EFFECTIVE DATE BIOGEN becomes 
obligated to pay any royalties or other sums to THIRD PARTIES because the 
manufacture, use or sale of CVT-124 or another Adenosine A(1) Antagonist 
contained in a PRODUCT sold by BIOGEN hereunder in the TERRITORY infringes 
such THIRD PARTIES' intellectual property  rights, then BIOGEN shall be 
entitled to credit [  *  ] of any such obligations against 
Royalties due to CVT pursuant to this Section 10.2.

              (ii) In the event that after the EFFECTIVE DATE BIOGEN becomes 
obligated to pay any royalties or other sums to THIRD PARTIES because the 
manufacture, use or sale of a PRODUCT sold by BIOGEN hereunder in the 
TERRITORY infringes such THIRD PARTIES' intellectual property  rights on 
account of a fact other than [  *  ] then the matter shall be referred to the 
Oversight Committee to determine in good faith whether or not BIOGEN shall be 
entitled to a credit of up to [  *  ] of any such obligations against 
Royalties due to CVT pursuant to this Section 10.2.  In the event the 
Oversight Committee cannot agree within forty-five (45) days after referral 
of the matter to them for resolution, then the [  *  ] representatives to the 
Oversight Committee shall [  *  ]

- --------------------------
 * Confidential treatment requested.

                                       22.

<PAGE>

              (iii)  In no event shall any credits under subsections (d)(i) 
and (d)(ii), or any cost-sharing pursuant to subsection (e) below, reduce 
Royalties payable to CVT hereunder for any CALENDAR QUARTER by more than [  *  ]
of the amounts otherwise due.  [  *  ]

         (e)  In the event that [  *  ] of CVT-124 identified during Phase 1 
of the RESEARCH PROGRAM results in [  *  ] (including, but not limited to, 
any cost to BIOGEN of [  *  ] as compared to what it would have been using 
[  *  ] CVT-124 in the [  *  ] BIOGEN and CVT agree to negotiate a [  *  ] and 
[  *  ] to reflect a [  *  ]  BIOGEN may initiate any such negotiation by 
delivering a written notice  to CVT, whereupon the relevant representatives 
of the parties on the OPERATING COMMITTEE parties shall meet and negotiate a 
reduction as aforesaid in good faith.  In the event the OPERATING COMMITTEE 
representatives  cannot agree within thirty (30) days of delivery of such 
notice by BIOGEN, the matter shall be referred to the OVERSIGHT COMMITTEE for 
resolution.    In the event the representatives to the OVERSIGHT COMMITTEE 
cannot agree within fifteen (15) days of referral of the matter to them for 
resolution, the matter shall be submitted to binding arbitration pursuant to 
the provisions of Appendix F hereof.  

         (f)  NET SALES of PRODUCT in a country in the TERRITORY for which 
BIOGEN has no royalty obligation, pursuant to Section 10.2(c), shall not be 
included in the calculation of the level of NET SALES for purposes of Section 
10.2(a).      

         (g)  In addition to the foregoing, CVT shall receive a percentage of 
BIOGEN's SUBLICENSE INCOME in accordance with this subsection (g).  

              (i)  In MAJOR MARKET countries, CVT shall receive [  *  ] of 
SUBLICENSE INCOME, subject to the following floors and cap.  For sublicenses 
executed prior to the [  *  ] in no event shall CVT receive less than [  *  ] 
of net sales of SUBLICENSEES (calculated using the NET SALES definition) for 
any PRODUCTS covered by a VALID CLAIM of CVT PATENT RIGHTS in the country in 
which they are sold.  For sublicenses executed after [  *  ] for such 
PRODUCT, in no event shall CVT receive pursuant to this 

- --------------------------
 * Confidential treatment requested.

                                       23.

<PAGE>

subsection less than [  *  ] of net sales of SUBLICENSEES (calculated using the
NET SALES definition) for any PRODUCTS covered by a VALID CLAIM of CVT PATENT 
RIGHTS in the country in which they are sold.  Notwithstanding the foregoing, 
if the use or sale of PRODUCT by a SUBLICENSEE in the country in which the 
PRODUCT is sold is not covered by a VALID CLAIM of a CVT PATENT RIGHT in such 
country, the minimum percentages set forth in the previous two sentences 
shall be [  *  ] respectively.  In no event shall CVT receive pursuant to 
this subsection an amount greater than the Royalties which would have been 
due pursuant to this Section 10.2 on NET SALES of SUBLICENSEES if such NET 
SALES had been made by BIOGEN.

              (ii) In non-MAJOR MARKET countries, CVT shall receive [  *  ] 
of SUBLICENSE INCOME, subject to the following floors and cap.  In no event 
shall CVT receive pursuant to this subsection less than [  *  ] of net sales 
of SUBLICENSEES (calculated using the NET SALES definition) for any PRODUCTS 
covered by a VALID CLAIM of CVT PATENT RIGHTS in the country in which they 
are sold.  Notwithstanding the foregoing, if the use or sale of PRODUCT by a 
SUBLICENSEE in the country in which the PRODUCT is sold is not covered by a 
VALID CLAIM of a CVT PATENT RIGHT in such country, the minimum percentage set 
forth in the previous sentence shall be [  *  ] In no event shall CVT receive 
pursuant to this subsection an amount greater than the Royalties which would 
have been due pursuant to this Section 10.2 on NET SALES of SUBLICENSEES if 
such NET SALES had been made by BIOGEN.

         (h)  CVT hereby grants BIOGEN the right to [  *  ] on sales of 
PRODUCT by BIOGEN, BML, their AFFILIATES and SUBLICENSEES; provided that if 
CVT also desires to [  *  ] BIOGEN and CVT shall [  *  ] In the event BIOGEN is 
successful in [  *  ] on such sales, the royalties otherwise payable by 
BIOGEN to CVT hereunder, and the royalties otherwise payable by BML to CVT 
under the BML AGREEMENT, shall be [  *  ] and the royalties otherwise payable 
by CVT to BIOGEN pursuant to Section 14.8 hereof, and by CVT to BML pursuant 
to the corresponding provision of the BML AGREEMENT, shall be [  *  ] 
provided that CVT shall share in the benefits of any such [  *  ] in an 
amount commensurate with [  *  ]

    10.3 (a)  BIOGEN shall pay the following amounts within [  *  ]
of the occurrence of the following milestone events with respect to the first 
PRODUCT to reach such milestone:

- --------------------------
 * Confidential treatment requested.

                                       24.

<PAGE>

    Milestone                                         Amount
    ---------                                         ------

    (i)    [  *  ]                                    [  *  ]

    (ii)   [  *  ]                                    [  *  ]

    (iii)  [  *  ]                                    [  *  ]

    (iv)   [  *  ]                                    [  *  ]

    (v)    [  *  ]                                    [  *  ]

    (vi)   [  *  ]                                    [  *  ]

    (vii)  [  *  ]                                    [  *  ]

    (viii) [  *  ]                                    [  *  ]

    (ix)   [  *  ]                                    [  *  ]

    (x)    [  *  ]                                    [  *  ]

*   Provided that BIOGEN has not given notice of termination of this 
Agreement prior to expiration of such [  *  ] period.  

**  [  *  ] shall be determined by Biogen's decision to commence [  *  ] with 
respect to such chemical entity. Biogen has pre-paid this milestone in 
anticipation of the successful completion of a [  *  ] study with CVT-124, 
pursuant to Section 10.1(e) hereof.

         (b)  In the event BIOGEN does not [  *  ] and this 

- --------------------------
 * Confidential treatment requested.

                                       25.

<PAGE>

Agreement has not been terminated,  and (i) [  *  ] planning or ongoing and 
(ii) no material health or safety issue has arisen with respect to the 
clinical use of PRODUCT, BIOGEN will pay CVT the related milestone fee as set 
forth in Section 10.3(a)(iii) above as if it had reached such milestone at 
such time, but such milestone payment shall not be due thereafter when a 
[  *  ] is actually commenced.  In the event that any material health or 
safety issue arises with respect to PRODUCT, BIOGEN shall nevertheless 
continue to use commercially reasonable efforts to develop a PRODUCT.  

         (c)  In the event BIOGEN has not [  *  ] of the notice of decision 
by BIOGEN to commence [  *  ] of a PRODUCT in the United States, and this 
Agreement has not been terminated, BIOGEN will nevertheless pay CVT the 
related milestone set forth in Section 10.3(a)(vii) above in advance as if it 
had reached such milestone at such time, but such milestone shall not be due 
thereafter when such [  *  ]

    10.4 BIOGEN shall keep, and shall cause each of its AFFILIATES to keep, 
full and accurate books of account containing all particulars relevant to its 
sales of PRODUCTS that may be necessary for the purpose of calculating all 
compensation payable to CVT hereunder.  Such books of account shall be kept 
at their principal place of business and for the three (3) years next 
following the end of the calendar year to which each shall pertain, be open 
for inspection by an independent certified public accountant reasonably 
acceptable to BIOGEN, upon reasonable notice during normal business hours at 
CVT's expense for the sole purpose of verifying compensation due under this 
Agreement.  In the event the inspection determines that compensation due CVT 
for any period has been underpaid by [  *  ] or more, then BIOGEN shall pay 
for all costs of the inspection, otherwise the costs of the inspection shall 
be borne by CVT.  In all cases, BIOGEN shall pay to CVT any underpaid 
compensation promptly and CVT shall promptly pay to BIOGEN any overpaid 
compensation.  All information and data reviewed in the inspection shall be 
used only for the purpose of verifying compensation due and shall be treated 
as BIOGEN Confidential Information subject to the obligations of this 
Agreement.  No audit by an agent of CVT shall occur more frequently than once 
during any twelve (12) month period.

    10.5 In each year the amount of compensation due shall be calculated 
quarterly as of the end of each CALENDAR QUARTER and shall be paid quarterly 
within the [  *  ] days next following such date, unless such CALENDAR 
QUARTER is the last CALENDAR QUARTER of the year, in which case the 
compensation due shall be paid within [  *  ] days next following such date.  
Every such payment shall be supported by the accounting prescribed in Section 
10.6 and shall be made in United States currency.  Whenever for the purpose 
of calculating compensation, conversion 

- --------------------------
 * Confidential treatment requested.

                                       26.

<PAGE>

from any foreign currency shall be required, such conversion shall be at the 
rate of exchange published in The Wall Street Journal for the last business 
day of the CALENDAR QUARTER.

    10.6 With each quarterly payment, BIOGEN shall deliver to CVT a full and
accurate accounting to include at least the following information:

         (a)  Total billings for PRODUCT subject to Royalty;

         (b)  Deductions applicable as provided in Section 1.17;

         (c)  Applicable royalty rates (including any credits as provided in
Section 10.2(b) or (d));

         (d)  SUBLICENSEE income and royalties thereon; and

         (e)  Total compensation payable to CVT.

    10.7 If the transfer of or the conversion into United States Dollars of 
any remittance due hereunder is not lawful or possible in any country, such 
remittance shall be made by the deposit thereof in the currency of the 
country to the credit and account of CVT or its nominee in any commercial 
bank or trust company located in that country, prompt notice of which shall 
be given to CVT. CVT shall be advised in writing in advance by BIOGEN and 
provide to BIOGEN a nominee, if so desired.

    10.8 Any tax required to be withheld by BIOGEN under the laws of any 
foreign country for the account of CVT, shall be promptly paid by BIOGEN for 
and on behalf of CVT to the appropriate governmental authority, and BIOGEN 
shall use its best efforts to furnish CVT with proof of payment of such tax.  
Any such tax actually paid on CVT's behalf shall be deducted from royalty 
payments due CVT.

    10.9 Compensation shall be due and payable for the manufacture, use and 
sale of an individual PRODUCT only once with respect to the same unit of 
PRODUCT irrespective of the number of patents or claims thereof which cover 
the manufacture, use and sale of such PRODUCT.  In no event shall 
compensation shall be due and payable hereunder for the manufacture, use or 
sale of an individual PRODUCT for which CVT receives compensation in the way 
of royalties under the BML AGREEMENT.

SECTION 11.   REPRESENTATIONS AND WARRANTIES.

    11.1 Each party represents and warrants to the other party that: (i) it 
is free to enter into this Agreement; (ii) in so doing, it will not violate 
any other agreement to which it is a party; and (iii) it has taken all 
corporate action necessary to authorize the 

                                       27.

<PAGE>

execution and delivery of this Agreement and the performance of its 
obligations under this Agreement.

    11.2 (a)  Each party represents that it is not aware of any action, suit, 
inquiry or investigation or any claim, demand or notice of default which if 
adversely determined would affect the rights granted under this Agreement.

         (b)  Each party acknowledges that in entering into this Agreement 
the other party has relied upon information supplied by the disclosing party, 
including, in the case of information supplied by CVT, data and information 
concerning CVT-124 and preclinical and clinical studies and information 
related to CVT PATENT RIGHTS.  Neither party is aware of any data or 
information given to the other party which is untrue or inaccurate or of any 
other data or information which is necessary to make the data and information 
provided to the other party complete and not misleading.  To the best of 
CVT's knowledge, [  *  ]

    11.3 CVT hereby represents, warrants and covenants to BIOGEN that:

         (a)  It is the [  *  ] under this Agreement and has the right and 
has taken all necessary action to [  *  ] provided that the foregoing shall 
not be interpreted as a warranty of non-infringement;

         (b)  To the best of CVT's knowledge, CVT has disclosed to BIOGEN all 
facts that CVT reasonably believes to be [  *  ] known to CVT as of the 
EFFECTIVE DATE;

         (c)  All patent applications included in CVT PATENT RIGHTS existing 
as of the Effective Date are pending and have not been abandoned;

         (d)  CVT [  *  ] to BIOGEN pursuant to this Agreement.

         (e)  CVT will not take any action that would in any way prevent CVT 
from granting the rights granted to BIOGEN under this Agreement with respect 
to CVT PATENT RIGHTS or CVT TECHNOLOGY acquired after the EFFECTIVE DATE or 
which would otherwise [  *  ] BIOGEN under this Agreement.  Nothing herein 
shall prohibit the amendment or modification of the scope of claims during 
the patent prosecution process.

- --------------------------
 * Confidential treatment requested.

                                       28.

<PAGE>

         (f)  CVT has [  *  ]

         (g)  CVT will take all actions required by it to maintain its rights 
under the UFRFI LICENSE as in effect on the EFFECTIVE DATE, and shall 
immediately send to BIOGEN any notice of default or breach received by CVT 
under the UFRFI LICENSE.

         (h)  All employees of CVT who perform research and development for 
CVT in connection with CVT's obligations under this Agreement are required to 
assign their rights in any intellectual property arising from such work to 
CVT.  

         (i)  Appendix A contains a complete and accurate list of all CVT 
PATENT RIGHTS in existence as of the EFFECTIVE DATE.

         (j)  CVT will not enforce any patent rights owned or controlled by 
it to prevent the manufacture, use or sale of any PRODUCT for which BIOGEN 
has a royalty obligation to CVT hereunder subject to the license granted 
herein by BIOGEN or its AFFILIATES or SUBLICENSEES, or any person or entity 
purchasing a PRODUCT from any of them.

    11.4 CVT represents that it has not as of the EFFECTIVE DATE [  *  ] the 
manufacture, use or sale of PRODUCT and it is not aware of any infringement 
by a THIRD PARTY of the CVT PATENT RIGHTS.

SECTION 12.   INDEMNIFICATION.

    12.1 INDEMNIFICATION BY BIOGEN.  BIOGEN will defend, indemnify and hold 
harmless CVT, its AFFILIATES  and their employees, agents, officers, 
shareholders and directors and each of them (the "CVT Indemnified Parties") 
from and against any and all third party claims, causes of action and costs 
(including reasonable attorney's fees) of any nature made or lawsuits or 
other proceedings filed or otherwise instituted against the CVT Indemnified 
Parties resulting from or arising out of the manufacture, use or sale of any 
PRODUCT by BIOGEN, its AFFILIATES or SUBLICENSEES, other than those claims 
which result or arise from breach of this Agreement by CVT or failure by CVT 
to comply in any material respect with applicable laws or regulations or the 
negligence or willful misconduct of CVT or any its AFFILIATES or any of their 
employees, agents, officers,  shareholders or directors.

- --------------------------
 * Confidential treatment requested.

                                       29.

<PAGE>

    12.2 INDEMNIFICATION BY CVT.  CVT will defend, indemnify and hold 
harmless BIOGEN, its AFFILIATES and their employees, agents, officers, 
shareholders and directors and each of them (the "BIOGEN Indemnified 
Parties") from and against any and all third party claims, causes of action 
and costs (including reasonable attorney's fees) of any nature made or 
lawsuits or other proceedings filed or otherwise instituted against any of 
the BIOGEN Indemnified Parties resulting from or arising out of breach of 
this Agreement by CVT or failure of CVT to comply in any material respect 
with applicable laws or regulations or the negligence or willful misconduct 
of CVT or its AFFILIATES or any of their employees, agents, officers, 
shareholders or directors. 

    12.3 CONDITIONS TO INDEMNIFICATION.  A person or entity that intends to 
claim indemnification under this Section (the "Indemnitee") shall promptly 
notify the indemnifying party (the "Indemnitor") of any loss, claim, damage, 
liability or action in respect of which the Indemnitee intends to claim such 
indemnification, and the Indemnitor shall assume the defense thereof with 
counsel mutually satisfactory to the Indemnitee whether or not such claim is 
rightfully brought; provided, however, that an Indemnitee shall have the 
right to retain its own counsel, with the fees and expenses to be paid by the 
Indemnitor if Indemnitor does not assume the defense, or if representation of 
such Indemnitee by the counsel retained by the Indemnitor would be 
inappropriate due to actual or potential differing interests between such 
Indemnitee and any other person represented by such counsel in such 
proceedings.  The indemnity agreement in this Section shall not apply to 
amounts paid in settlement of any loss, claim, damage, liability or action if 
such settlement is effected without the consent of the Indemnitor, which 
consent shall not be withheld or delayed unreasonably.  The failure to 
deliver notice to the Indemnitor within a reasonable time after the 
commencement of any such action, only if prejudicial to its ability to defend 
such action, shall relieve such Indemnitor of any liability to the Indemnitee 
under this Section, but the omission so to deliver notice to the Indemnitor 
will not relieve it of any liability that it may have to any Indemnitee 
otherwise than under this Section.  The Indemnitee under this Section, its 
employees and agents, shall cooperate fully with the Indemnitor and its legal 
representatives in the investigations of any action, claim or liability 
covered by this indemnification.

SECTION 13.   ASSIGNMENT; SUCCESSORS.

    13.1 This Agreement shall not be assignable by either of the parties 
without the prior written consent of the other party (which consent shall not 
be unreasonably withheld), except that BIOGEN without the consent of CVT may 
assign this Agreement or any of its rights and obligations hereunder to an 
AFFILIATE or to an entity with which BIOGEN shall merge or consolidate or to 
which BIOGEN shall sell or assign all or substantially all of its assets, and 
except that CVT without the consent of BIOGEN 

                                       30.

<PAGE>

may assign this Agreement to an entity with which CVT shall merge or 
consolidate or to which CVT shall sell or assign all or substantially all of 
its assets.

    13.2 Subject to the limitations on assignment herein, this Agreement 
shall be binding upon and inure to the benefit of said successors in interest 
and assigns of CVT and BIOGEN. 

SECTION 14.   TERMINATION.

    14.1 Except as otherwise specifically provided herein and unless sooner 
terminated pursuant to Sections 14.2, 14.3, 14.4 or 14.9 of this Agreement, 
this Agreement and the licenses and rights granted hereunder shall remain in 
full force and effect until BIOGEN's obligations to pay compensation 
hereunder terminate.  Upon expiration of BIOGEN's obligation to pay 
compensation hereunder with respect to a specific country and specific 
PRODUCT as to which BIOGEN's license is then in effect, the license granted 
to BIOGEN with respect to such country and such PRODUCT pursuant to Section 
2.1 shall be deemed to be fully paid and BIOGEN shall thereafter have a 
royalty-free right to use the CVT PATENT RIGHTS and CVT TECHNOLOGY and to 
make, use, import and sell such PRODUCT in such country.

    14.2 Upon breach of any material provisions of this Agreement by either 
party to this Agreement, in the event the breach is not cured within [  *  ] 
days after written notice to the breaching party by the other party, in 
addition to any other remedy it may have, the other party at its sole option 
may terminate this Agreement, provided that such other party is not then in 
breach of this Agreement.

    14.3 Either party to this Agreement may, upon giving notice of 
termination, immediately terminate this Agreement upon receipt of notice that 
the other party has become insolvent or has suspended business in all 
material respects hereof, or has consented to an involuntary petition 
purporting to be pursuant to any reorganization or insolvency law of any 
jurisdiction, or has made an assignment for the benefit of creditors or has 
applied for or consented to the appointment of a receiver or trustee for a 
substantial part of its property; provided, however, that the insolvency or 
bankruptcy of CVT shall not operate to terminate the licenses granted to 
BIOGEN hereunder unless BIOGEN elects to terminate the Agreement as provided 
herein, and BIOGEN may elect to retain its licenses as provided in 11 U.S.C. 
Section 356.

    14.4 In addition to the foregoing, within [  *  ] days of BIOGEN's 
receipt of the data from the [  *  ] BIOGEN may terminate this Agreement upon 
written notice in its sole discretion.  At any time after [  *  ] BIOGEN may 
terminate this Agreement for any reason upon [  *  ] days prior written 
notice to CVT.  

- --------------------------
 * Confidential treatment requested.

                                       31.

<PAGE>

    14.5 Upon any termination of this Agreement, all licenses and rights 
granted to BIOGEN shall terminate forthwith, except that BIOGEN shall be 
entitled to, but shall not be obligated [  *  ] covered by this Agreement 
which exists as of the date of the termination, so long as BIOGEN [  *  ] in 
accordance with the same terms and conditions as set forth in this Agreement.

    14.6 The obligations of Sections 6 and 12, as well as Sections 14.5, 
14.6, 14.7, 14.8,  15.4, and 15.8 and the repayment obligation under the 
Note(s) shall survive any termination of this Agreement.

    14.7 In the event of any termination under Section 14.4 or 14.9 or in the 
event CVT terminates this Agreement pursuant to Sections 14.2 or 14.3, BIOGEN 
shall grant to CVT a non-exclusive, worldwide, royalty-bearing license under 
[  *  ] and [  *  ] solely to make, have made, import, use and sell PRODUCTS 
and shall make available to CVT  copies of all documents containing or 
comprising such [  *  ] and [  *  ] CVT shall [  *  ] BIOGEN in making such 
[  *  ] and [  *  ] available to CVT. Furthermore, in the event that, at the 
time of termination under Section 14.4 or 14.9 or of termination by CVT 
pursuant to Sections 14.2 or 14.3, [  *  ] funding for such [  *  ] unless 
[  *  ] Upon such termination the [  *  ] shall, to the extent permissible by 
law, be [  *  ] To this end, BIOGEN agrees that upon such termination it 
shall [  *  ] relating to CVT-124 and for [  *  ] by CVT hereunder.  BIOGEN 
shall promptly deliver copies of such filings to CVT and execute any and all 
documents and instruments reasonably requested by CVT to confirm the 
assignment of such filings.  CVT and BIOGEN shall cooperate in the transition 
of BIOGEN's regulatory filings to CVT in such a way as not to harm either 
CVT's or BIOGEN's relationship with the relevant regulatory authorities.  To 
that end, CVT may elect to have one or more of BIOGEN's employees participate 
in meetings between CVT and regulatory authorities regarding assignment of 
BIOGEN's regulatory filings.  

    14.8 In the event that, following any termination of this Agreement, CVT, 
or its permitted successor or assignee, subsequently commercializes a PRODUCT 
by itself or in conjunction with a THIRD PARTY, CVT, or its permitted 
successor or assignee, 

- --------------------------
 * Confidential treatment requested.

                                       32.

<PAGE>

shall pay a royalty to BIOGEN on sales of PRODUCT in the TERRITORY in 
accordance with the following:

         (a)  If the Agreement has been terminated prior to receipt by CVT of 
the [  *  ] milestone payable in accordance with Section 10.3(a)(i) hereof 
[  *  ] and the manufacture, use or sale of the commercialized PRODUCT is 
covered by a VALID CLAIM of the BIOGEN CVT-124 PATENTS or includes any of the 
BIOGEN CVT-124 TECHNOLOGY, CVT shall pay BIOGEN royalties on net sales of 
PRODUCT and a percentage of CVT'S SUBLICENSE INCOME as follows:

              (i)  Royalties payable to BIOGEN shall be [  *  ] and 
determined based on worldwide annual net sales (calculated in accordance with 
the NET SALES definition set forth in Section 1.17 hereof, and including NET 
SALES under the BML AGREEMENT) in each calendar year in accordance with the 
following table:

      [  *  ] Annual Net Sales             Royalty
    -----------------------------------------------
    Up to [  *  ] Million                  [  *  ]

    [  *  ] Million to [  *  ] Million     [  *  ]

    Over [  *  ] Million                   [  *  ]

              (ii) CVT shall pay to BIOGEN [  *  ] of SUBLICENSE INCOME 
received by it from sublicensees.  Prior to calculation of Biogen's [  *  ] 
CVT may deduct from SUBLICENSE INCOME any royalty paid by CVT to [  *  ] on 
account of sales of PRODUCT in the TERRITORY in such period.

         (b)  If the Agreement has been terminated after receipt by CVT of 
the [  *  ] but prior to completion of a [  *  ] of the PRODUCT, CVT shall 
pay BIOGEN royalties on net sales of PRODUCT and a percentage of SUBLICENSE 
INCOME as follows:

              (i)  Royalties payable to BIOGEN shall be [  *  ] and 
determined based on worldwide annual net sales (calculated in accordance with 
the NET SALES definition set forth in Section 1.17 hereof, and including NET 
SALES under the BML AGREEMENT) in each calendar year in accordance with the 
following table:

- --------------------------
 * Confidential treatment requested.

                                       33.

<PAGE>

    [  *  ] Annual Net Sales               Royalty
    -----------------------------------------------
    Up to [  *  ] Million                  [  *  ]

    [  *  ] Million to [  *  ] Million     [  *  ]

    Over [  *  ] Million                   [  *  ]

              (ii) CVT shall pay to BIOGEN [  *  ] of SUBLICENSE INCOME 
received by it from sublicensees.  Prior to calculation of Biogen's [  *  ] 
share, CVT may deduct from SUBLICENSE INCOME any royalty paid by CVT to 
[  *  ] on account of sales of PRODUCT in the TERRITORY in such period.

         (c)  If the Agreement has been terminated after completion of a 
[  *  ] of the PRODUCT, but prior to the availability of [  *  ] CVT shall 
pay BIOGEN royalties on net sales of PRODUCT and a percentage of SUBLICENSE 
INCOME as follows:

              (i)  Royalties payable to BIOGEN shall be [  *  ] and 
determined based on worldwide annual net sales (calculated in accordance with 
the NET SALES definition set forth in Section 1.17 hereof, and including NET 
SALES under the BML AGREEMENT) in each calendar year in accordance with the 
following table:

    [  *  ] Annual Net Sales                Royalty
    -----------------------------------------------
    Up to [  *  ] Million                   [  *  ]

    [  *  ] Million to [  *  ] Million      [  *  ]

    Over [  *  ] Million                    [  *  ]

              (ii) CVT shall pay to BIOGEN [  *  ] of SUBLICENSE INCOME 
received by it from sublicensees.  Prior to calculation of Biogen's [  *  ] 
share, CVT may deduct from SUBLICENSE INCOME any royalty paid by CVT to 
[  *  ] on account of sales of PRODUCT in the TERRITORY in such period.

         (d)  If the Agreement has been terminated after the availability of 
[  *  ] of the PRODUCT, CVT shall pay BIOGEN royalties on net sales of 
PRODUCT and a percentage of SUBLICENSE INCOME as follows:
- --------------------------
 * Confidential treatment requested.

                                       34.

<PAGE>

              (i)  Royalties payable to BIOGEN shall be [  *  ] and 
determined based on worldwide annual net sales (calculated in accordance with 
the NET SALES definition set forth in Section 1.17 hereof, and including NET 
SALES under the BML AGREEMENT) in each calendar year in accordance with the 
following table:

    [  *  ] Annual Net Sales               Royalty
    -----------------------------------------------
    Up to [  *  ] Million                  [  *  ]

    [  *  ] Million to [  *  ] Million     [  *  ]

    Over [  *  ] Million                   [  *  ]

              (ii) CVT shall pay to BIOGEN [  *  ] of SUBLICENSE INCOME 
received by it from sublicensees.  Prior to calculation of Biogen's [  *  ] 
share, CVT may deduct from SUBLICENSE INCOME any royalty paid by CVT to 
[  *  ] on account of sales of PRODUCT in the TERRITORY in such period.

         (e)  In the event that after the EFFECTIVE DATE CVT becomes 
obligated to pay any royalties or other sums to THIRD PARTIES because the 
manufacture, use or sale of PRODUCTS in the TERRITORY infringes the 
intellectual property rights of such THIRD PARTIES, CVT shall be entitled to 
credit [  *  ] of any such obligations against Royalties due to BIOGEN 
pursuant to this Section 14.8; provided, however, that in no event shall such 
credit reduce Royalties payable to BIOGEN hereunder for any CALENDAR QUARTER 
by more than [  *  ] of the amounts otherwise due.  [  *  ]

         (f)  CVT shall keep full and accurate books of account containing 
all particulars relevant to its sales of PRODUCTS that may be necessary for 
the purpose of calculating all compensation payable to BIOGEN hereunder, and 
shall be subject to the same provisions as are contained in Section 10.4 
hereof.

         (g)  All payments due to BIOGEN pursuant to this Section 14.8 shall 
be made in accordance with Sections 10.5, 10.6 (excluding the section 
references therein), 10.7 and 10.8 hereof, in each case substituting CVT for 
BIOGEN as appropriate, and vice versa.

    14.9 This Agreement shall automatically terminate upon the termination of 
the BML AGREEMENT.

- --------------------------
 * Confidential treatment requested.

                                       35.

<PAGE>

SECTION 15.   GENERAL PROVISIONS.

    15.1 Neither party shall be liable to the other party for damages or loss 
occasioned by failure of performance by the defaulting party if the failure 
is occasioned by war, fire, explosion, flood, strike or lockout, embargo, or 
any similar cause beyond the control of the defaulting party, provided that 
the party claiming this exception has exerted all reasonable efforts to avoid 
or remedy such event and provided such event does not extend for more than 
six (6) months. 

    15.2 The relationship between CVT and BIOGEN is that of independent 
contractors.  CVT and BIOGEN are not joint venturers, partners, principal and 
agent, master and servant, employer or employee, and have no relationship 
other than as independent contracting parties.  CVT shall have no power to 
bind or obligate BIOGEN in any manner.  Likewise, BIOGEN shall have no power 
to bind or obligate CVT in any manner.

    15.3 This Agreement and the BML AGREEMENT set forth the entire agreement 
and understanding between the parties as to the subject matter hereof and 
supersede all prior agreements in this respect.  There shall be no amendments 
or modifications to these Agreements, except by a written document which is 
signed by both parties.

    15.4 This Agreement shall be construed and enforced in accordance with 
the laws of the State of Delaware, U.S.A. without reference to its 
choice-of-law principles.

    15.5 The headings in this Agreement have been inserted for the 
convenience of reference only and are not intended to limit or expand on the 
meaning of the language contained in the particular or section or paragraph.

    15.6 Any delay in enforcing a party's rights under this Agreement or any 
waiver as to a particular default or other matter shall not constitute a 
waiver of a party's right to the future enforcement of its rights under this 
Agreement, excepting only as to an expressed written and signed waiver as to 
a particular matter for a particular period of time.

    15.7 In conducting any activities under this Agreement or in connection 
with the manufacture use or sale of PRODUCT, BIOGEN shall comply with all 
applicable laws and regulations including, but not limited to, all Export 
Administration Regulations of the United States Department of Commerce.

    15.8 NOTICES.  Any notices given pursuant to this Agreement shall be in 
writing and shall be deemed delivered upon the earlier of (i) when received 
at the address set forth below, or (ii) three (3) business days after mailed 
by certified or registered mail 

                                       36.

<PAGE>

postage prepaid and properly addressed, with return receipt requested, or 
(iii) when sent, if sent, by facsimile, as confirmed by certified or 
registered mail.  Notices shall be delivered to the respective parties as 
indicated:

    If to CVT:                    CV Therapeutics, Inc.
                                  3172 Porter Drive
                                  Palo Alto, CA 94304
                                  Attn: CEO


              with a copy to:     Cooley Godward LLP
                                  3000 El Camino Real
                                  Palo Alto, CA 94306
                                  Attn: Robert L. Jones, Esq.
                                  Deborah Marshall, Esq.


    If to BIOGEN:                 Biogen, Inc.
                                  14 Cambridge Center
                                  Cambridge, MA 02142
                                  Attn: President

              with a copy to      Vice President - General Counsel

    15.9 This Agreement may be executed in any number of separate 
counterparts, each of which shall be deemed to be an original, but which 
together shall constitute one and the same instrument.

    IN WITNESS WHEREOF, the parties have executed this Agreement as of the 
date set forth above.

CV THERAPEUTICS, INC.                  BIOGEN, INC.

By: /s/ Louis Lange                    By: /s/ James R. Tobin
   --------------------------------       --------------------------------

Name: Louis Lange                      Name: James R. Tobin
     ------------------------------         ------------------------------

Title: CEO                             Title: President and CEO
      -----------------------------          -----------------------------


                                       37.

<PAGE>

                                      APPENDIX A

                                    PATENT RIGHTS

                                    [SEE ATTACHED]


<PAGE>

                                     U. S. PATENTS
<TABLE>
<CAPTION>

              Docket No./                                                                   Issue Date/   Patent
Patent No.    Serial No.     Title                                     Inventor(s)          Date File     Expires
- --------------------------------------------------------------------------------------------------------------------
<S>           <C>            <C>                                       <C>                  <C>           <C>

[                                                            *                                                      ]

</TABLE>

  [  *  ]


- --------------------------
 * Confidential treatment requested.

                                       1

<PAGE>

                      U.S. PENDING PATENT APPLICATIONS

<TABLE>
<CAPTION>

Docket No./
Serial No.    Descriptive Title                         Inventor(s)            Date Filed     Status
- ------------------------------------------------------------------------------------------------------------
<S>           <C>                                       <C>                    <C>            <C>

[                                                            *                                                      ]

</TABLE>

[  *  ]

- --------------------------
 * Confidential treatment requested.

                                       2

<PAGE>

                      U.S. PENDING PATENT APPLICATIONS (CONT'D)


<TABLE>
<CAPTION>

Docket No./
Serial No.    Descriptive Title                         Inventor(s)            Date Filed     Status
- ----------------------------------------------------------------------------------------------------------------
<S>           <C>                                       <C>                    <C>            <C>

[                                                             *                                                 ]

</TABLE>

- --------------------------
 * Confidential treatment requested.
[  *  ]

                                       3
<PAGE>

                    U.S. PENDING PATENT APPLICATIONS (CONT'D)


<TABLE>
<CAPTION>

Docket No./
Serial No.    Descriptive Title                         Inventor(s)            Date Filed     Status
- -------------------------------------------------------------------------------------------------------------
<S>           <C>                                       <C>                    <C>            <C>

[                                                             *                                                 ]

</TABLE>

[  *  ]

- --------------------------
 * Confidential treatment requested.

                                       4

<PAGE>


                      U.S. PENDING PATENT APPLICATIONS (CONT'D)


<TABLE>
<CAPTION>

Docket No./
Serial No.    Descriptive Title                         Inventor(s)            Date Filed     Status
- ----------------------------------------------------------------------------------------------------------------
<S>           <C>                                       <C>                    <C>            <C>

[                                                             *                                                 ]

</TABLE>

[  *  ]

- --------------------------
 * Confidential treatment requested.

                                       5

<PAGE>

                             FOREIGN PATENT APPLICATIONS 


<TABLE>
<CAPTION>

Docket No./
Serial No.           Descriptive Title                              Inventor(s)            Date Filed     Status
- ------------------------------------------------------------------------------------------------------------------------------
<S>                  <C>                                            <C>                    <C>            <C>

[                                                             *                                                 ]




</TABLE>

- --------------------------
 * Confidential treatment requested.

                                       6

<PAGE>

                         FOREIGN PATENT APPLICATIONS (CONT'D)


<TABLE>
<CAPTION>

Docket No./
Serial No.           Descriptive Title                              Inventor(s)            Date Filed     Status
- -------------------------------------------------------------------------------------------------------------------------------
<S>                  <C>                                            <C>                    <C>            <C>

[                                                             *                                                 ]

</TABLE>


- --------------------------
 * Confidential treatment requested.

                                       7

<PAGE>

                                   APPENDIX B

                              CLINICAL TRANSITION
                                           

    This Appendix shall govern the transition of the conduct of clinical trials
for CVT-124 from CVT to BIOGEN.    In the event of any inconsistencies between
this Appendix and the provisions of the Agreement, the provisions of this
Appendix shall govern.

    A.   [  *  ]  In the interest of avoiding any 
delay in the commencement of such study, BIOGEN and CVT agree as follows:

    CVT has entered into contracts with [  *  ] and a [  *  ] prior to the 
EFFECTIVE DATE for the conduct of CVT2123, true and correct copies of which 
have been provided to BIOGEN.  CVT is in the process of negotiating the 
remaining contracts necessary for the conduct of CVT2123, but shall not enter 
into any such contracts without the prior approval of BIOGEN.  Promptly after 
the EFFECTIVE DATE, BIOGEN and CVT shall enter into a contract pursuant to 
which CVT agrees INTER ALIA to manage the study pursuant to the direction of, 
and for the sole and exclusive benefit of, BIOGEN and agrees to assign 
exclusively to BIOGEN all rights and data from the study, and BIOGEN agrees 
to reimburse CVT for [  *  ] Such amounts shall be paid net thirty (30) days 
on CVT's invoices submitted at the end of each quarter.  Said agreement shall 
also provide for [  *  ] as is necessary to comply with applicable law for so 
long as [  *  ] In no event shall [  *  ]

    Notwithstanding the provisions of Section 4.1 of the Agreement, CVT shall 
directly supply all materials needs for CVT2123.  Delivery of any inventory 
of CVT-124 not needed for CVT2123 shall be made to BIOGEN in accordance with 
Section 4.1.

    B.   ALL OTHER CLINICAL STUDIES.  Notwithstanding Section 4.3 of the 
Agreement, CVT shall not enter into any contracts, or make any commitments to 
any THIRD PARTIES, with respect to any other clinical studies.  In the event 
that CVT does enter into any such contracts, or make any such commitments, 
BIOGEN shall not be bound by such contracts or commitments, and all 
responsibility therefor shall remain with CVT.

- --------------------------
 * Confidential treatment requested.


<PAGE>

The provisions of the second sentence of Section 4.3 of the Agreement are 
solely for the benefit of BIOGEN and shall not confer upon CVT any rights 
with respect the design, conduct or results of any clinical studies.


<PAGE>

                                      APPENDIX C

                                  CVT-124 INVENTORY

                                    [See attached]

<PAGE>

                                  CVT-124 INVENTORY

- ---------------------------------------------------------------------
PRODUCT                                   CURRENT STOCK
- ---------------------------------------------------------------------

[                               *                             ]

- --------------------------
 * Confidential treatment requested.


<PAGE>

                                      APPENDIX D

                                    PRESS RELEASE

                                    [See attached]


<PAGE>


CONTACT

Kathy Stafford
Chief Financial Officer
CV Therapeutics
415-812-9507

Biogen Media Contact:
Kathryn R. Bloom
Director of Communications
Biogen, Inc.
617-679-2851

Biogen Investment Community Contact:
Richard E.N. Lundberg
Manager, Investor Relations
Biogen, Inc.6179-679-2822

             BIOGEN AND CV THERAPEUTICS ANNOUNCE COLLABORATION ON CVT-124
                             FOR CONGESTIVE HEART FAILURE

CAMBRIDGE, MA (March 10, 1997) -- Biogen, Inc. (NASDAQ/BGEN) and CV 
Therapeutics (NASDAQ/CVTX) today announced that they have signed an agreement 
to collaborate on the development of CVT-124, a novel therapeutic for the 
treatment of edema associated with Congestive Heart Failure (CHF) that is 
expected to enter a multi-center Phase II clinical trial within the next 
month.

Under the terms of the agreement, Biogen and its wholly owned subsidiary, 
Biotech Manufacturing Limited, will receive exclusive worldwide rights to 
develop and sell CVT-124.  Biogen and CV Therapeutics will participate in 
developing the drug, but Biogen will pay all costs of commercializing the 
product.  CV Therapeutics will receive from Biogen upfront payments totaling 
$16 million, including a $5 million upfront cash payment, a $7 million equity 
investment of CV Therapeutics stock at $10.45 per share, advance funding of a 
development milestone and partial access to a line of credit.  In addition, 
Biogen will pay CV Therapeutics significant milestone payments and royalties 
on clinical progress and product sales.  Further details of the agreement 
were not announced.

Congestive Heart Failure is a chronic, progressive disease that affects 
approximately four-to-five million people in the United States.  Its 
prevalence is increasing at 10 percent per year, primarily


<PAGE>

due to the aging population as well as improved survival in heart disease 
patients.  Patients with CHF experience both a chronic course of the disease, 
as well as acute episodes that, in many cases,  require hospitalization.  
Edema, or fluid retention in the lungs and extremities, is a significant 
symptom of the disease, leading to increased morbidity and need for 
hospitalization.  In its most severe form, CHF results in a 50 percent 
one-year mortality rate.

CVT-124, a highly selective adenosine A(1)-receptor antagonist, could 
represent a novel therapy for the treatment of edema associated with CHF.  
Proof of this new mechanism of action has been demonstrated both in animal 
models and in a clinical Phase I study completed in 1996.  This new approach 
could be a significant advance because current therapies can lead to clinical 
resistance and unwanted side effects, such as potassium loss and impairment 
of kidney function.  Because of some of its potential properties, CVT-124 may 
be particularly useful in CHF patients who are resistant to current therapies 
and/or have renal impairment.

Jim Tobin, Biogen's President and Chief Executive Officer, said, "Developing 
Biogen's pipeline is a major strategic imperative for the Company, and we are 
pleased to be collaborating with CV Therapeutics to help meet this objective. 
CVT-124 represents a very promising commercial opportunity to enter an 
underserved market with a late-stage therapeutic.  We believe CVT-124, with 
its novel mechanism of action, may have a major impact in the treatment and 
management of Congestive Heart Failure.  It is a very attractive fit with 
Biogen's strategy of developing therapeutics for large underserved markets, 
such as neurological, cardiovascular and renal diseases."

Lou Lange, Chairman and Chief Executive Officer of CV Therapeutics, said, "In 
Biogen, we believe we have found partner for CVT-124 who can bring the 
product to market quickly and with whom we can work closely on development of 
this promising compound.  Biogen's outstanding performance in commercializing 
AVONEX-TM- gives us confidence that they will maximize the potential of 
CVT-124."

In addition to historical information, this press release contains 
forward-looking statements that involve risks and uncertainties that could 
cause actual results to differ materially from those reflected in such 
forward-looking statements.  Reference is made in particular to 
forward-looking statements regarding the timing of clinical trials, the 
potential results of drug development and the commercial opportunity for 
CVT-124.  Drug development involves a high degree of risk.  There are many 
factors which could cause actual results to differ from the Company's current 
expectations, including the Company's ability to demonstrate that CVT-124 is 
safe and effective at each stage of the clinical trial process; to meet 
applicable regulatory standards and receive required regulatory approval; to 
obtain and maintain necessary patents and licenses; to be capable of 
producing the product in commercial quantities at reasonable costs and to 
compete successfully against other products.

Biogen, Inc., headquartered in Cambridge, MA, is a biopharmaceutical company 
principally engaged in discovering and developing drugs for human healthcare 
through genetic engineering.  The Company's revenues are generated from U.S. 
sales of AVONEX-TM- (Interferon beta-1a) for treatment of relapsing forms of 
multiple sclerosis and from the worldwide sales by licenses of a 

<PAGE>

number of products, including alpha interferon and hepatitis B vaccines and 
diagnostic products.  Biogen is focused primarily on developing and testing 
novel products for multiple sclerosis, inflammatory, respiratory and kidney 
diseases and certain viruses and cancers.  For copies of press releases and 
additional information about the Company, please consult Biogen's Homepage on 
the World Wide Web at http://www.biogen.com.

CV Therapeutics, headquartered in Palo Alto, CA, is a biopharmaceutical 
company focused exclusively on the application of molecular cardiology to the 
discovery, development and commercialization of novel, small molecule drugs 
for the treatment of cardiovascular diseases.

                                     #    #    #


030796
s.97draft.cvt


<PAGE>

                                      APPENDIX E

                               RESEARCH PLAN - PHASE 1

                                    [SEE ATTACHED]


<PAGE>

                                   RESEARCH PROGRAM

OBJECTIVE
[  *  ]

STRUCTURE OF COLLABORATION
[  *  ]

PROGRAM PRIORITIES
[  *  ]

APPROACH
[  *  ]

RESOURCE ALLOCATION AT [  *  ] PER FULL TIME EQUIVALENT (FTE)
[  *  ]


- --------------------------
 * Confidential treatment requested.


<PAGE>

                            [LOGO] THERAPEUTICS
                                    RESEARCH

<TABLE>

<S>                             <C>                                  <C>
[                                        *                                    ]
</TABLE>

- --------------------------
 * Confidential treatment requested.


<PAGE>

                                      APPENDIX F

                                ARBITRATION PROCEDURE

In the event of a disagreement between the parties under Section 10.2(e) of 
the Agreement, which disagreement cannot be amicably resolved by the good 
faith efforts of the parties pursuant to such Section 10.2(e), then such 
dispute shall be resolved by binding Alternative Dispute Resolution ("ADR") 
in the manner described below:

    (a)  If a party intends to begin the ADR to resolve the disagreement, 
such party shall provide written notice to the other party informing the 
other party of such intention.  Within 5 business days following the receipt 
of the original ADR notice ("Notice Date") a neutral shall be selected by the 
then President of the American Arbitration Association ("AAA") or by such 
other individual as the parties may agree in good faith.  The neutral 
selected shall have experience in the biotechnology and/or pharmaceutical 
industry and shall not be an employee, director or shareholder of either a 
party or of an AFFILIATE of either party.

    Each party shall have ten (10) business days from the date the neutral is 
selected to object in good faith to the selection of that person.  If either 
party makes such an objection, the then President of  AAA shall as soon as 
possible thereafter, elect another neutral under the same conditions set 
forth above.  This second selection shall be final.

    (b)  No later than (90) business days after selection, the neutral shall 
hold a hearing to resolve the issue.

         (i)  Each party shall have the right to be represented by counsel at 
    the hearing.

         (ii) The hearing shall be held at such place as agreed upon by the   
  parties or if they are unable to agree at a place designated by the     
neutral.

    (c)  The ADR proceeding shall be confidential and the neutral shall issue 
appropriate protective orders to safeguard each party's Confidential 
Information.  Except as required by law, no party shall make (or instruct the 
neutral to make) any public announcement with respect to the proceedings or 
decision of the neutral without the prior written consent of each other 
party. The existence of the dispute submitted to ADR, and the award of the 
neutral, shall be kept in confidence by the parties and the neutral, except 
as required in connection with the enforcement of such award or as otherwise 
required by applicable law.


<PAGE>


    (d)  It is the intention of the parties that discovery, although 
permitted as described herein, will be extremely limited except in 
exceptional circumstances.  The neutral shall permit such limited discovery 
necessary for an understanding of any legitimate issue raised in the ADR, 
including the production of documents.  Each party shall be permitted but not 
required to take the deposition of not more than five (5) persons, each such 
deposition not to exceed six (6) hours in length.  If the neutral believes 
that exceptional circumstances exist, and additional discovery is necessary 
for a full and fair resolution of the issue, the neutral may order such 
discovery as the neutral deems necessary.  At the hearing the parties may 
present testimony (either by live witness or deposition) and documentary 
evidence.  The neutral shall have sole discretion with regard to the 
admissibility of any evidence and all other matters relating to the conduct 
of the hearing.

    (e)  Each party shall be entitled to no more than four (4) hours of 
hearing to present testimony or documentary evidence, unless such time period 
is extended by mutual agreement between the parties or is otherwise allowed 
by the neutral.  The testimony of both parties shall be presented during the 
same calendar day.  Such time limitation shall include any direct, cross or 
rebuttal testimony, but such time limitation shall include any direct, cross 
or rebuttal testimony, but such time limitation shall only be charged against 
the party conducting such direct, cross or rebuttal testimony.  It shall be 
the responsibility of the neutral to determine whether the parties have had 
the presentation time to which they are entitled.

    (f)  At least fifteen (15) business days prior to the date set for the 
hearing, each party shall submit to each other party and the neutral a list 
of all documents on which such party intends to rely in any oral or written 
presentation to the neutral and a list of all witnesses, if any, such party 
intends to call at such hearing and a brief summary of each witness' 
testimony.

    At least five (5) business days prior to the hearing, each party must 
submit to the neutral and serve on each other party a proposed ruling on the 
issue to be resolved.  Such writing shall be limited to representing the 
proposed ruling, shall contain no argument or analysis of the facts or 
issues, and shall be limited to not more than ten (10) pages, unless such 
writing is extended by mutual agreement between the parties or is otherwise 
allowed by the neutral.

    (g)  Not more than fifteen (15) business days following the close of 
hearings, the parties may each submit post hearing briefs to the neutral 
addressing the evidence and issues to be resolved.  Such post hearing briefs 
shall not be more than fifty (50) pages, unless such writing is extended by 
mutual agreement between the parties or is other wise allowed by the neutral.

<PAGE>

    (h)  The neutral shall rule on the disputed issue after the hearing as 
expeditiously as possible, but in no event more than forty-five (45) days 
after the close of the hearings.  Such ruling shall adopt in its entirety the 
proposed ruling of one of the parties.  The neutral shall, in rendering his 
decision, apply the substantive law of the State of Delaware, without giving 
effect to its principles of conflicts of law, and without giving effect to 
any rules or laws relating to arbitration.

    (i)  Any judgment upon the award rendered by the neutral may be entered 
in any court having jurisdiction thereof.  The decision rendered in any such 
ADR shall be final and not appealable, except in cases of fraud or bad faith 
on the part of the neutral or any party to the ADR proceeding in connection 
with the conduct of such proceedings, and shall be enforceable in any court 
of competent jurisdiction.  No punitive damages shall be recoverable by 
either party in such a proceeding.

    (j)  Each party shall pay its own costs (including, without limitation, 
attorneys fees) and expenses in connection with such ADR.

    (k)  In the event either party contends that there has been fraud or bad 
faith by the other party or in connection with the conduct of any ADR, a 
second ADR shall be held to determine whether there has been fraud or bad 
faith.  If, as a result of the second ADR, it is determined that there has 
been fraud or bad faith, the decision affected by such fraud or bad faith 
shall be vacated and another ADR shall be held to resolve the original 
dispute.


<PAGE>
                                                               Exhibit 10.40

Confidential treatment has been requested for portions of this document. 
Brackets indicate portions of text that have been omitted. A separate filing 
of such omitted text has been made with the Commission as part of the 
Company's application for confidential treatment.


                   RESEARCH COLLABORATION AND LICENSE AGREEMENT 
                                      (EUROPE)

    This Agreement is made and entered into this 7th day of March, 1997 by 
and between BIOTECH MANUFACTURING LTD. (hereinafter referred to as "BML"), a 
wholly-owned subsidiary of Biogen, Inc. ("BIOGEN"),  located at St. Paul's 
Gate, New Street, St. Helier, Jersey  JE48Z, Channel Islands, and CV 
THERAPEUTICS, INC., a Delaware corporation, located at 3172 Porter Drive, 
Palo Alto, CA 94304 (hereinafter referred to as "CVT").

    WHEREAS, BML is a biopharmaceutical company which develops, manufactures,
markets and sells pharmaceutical products for human healthcare; and

    WHEREAS, CVT is the owner and/or exclusive licensee of certain technology,
patent rights and other proprietary know-how related to PRODUCTS as hereinafter
defined; and

    WHEREAS, BML desires to obtain an exclusive right and license in and to
such technology, patent rights and proprietary know-how in the TERRITORY as
hereinafter defined; and

    WHEREAS, BML desires to support additional research related to PRODUCTS;
and

    WHEREAS, CVT is willing to grant the exclusive right and license desired by
BML and to participate in the conduct of the research supported by BML; and

    WHEREAS, CVT is granting an exclusive right and license in and to such
technology, patent rights and proprietary know-how outside the TERRITORY to
BIOGEN pursuant to a Research Collaboration and License Agreement (U.S.) of even
date herewith (the  "BIOGEN AGREEMENT") .

    NOW, THEREFORE, in consideration of the mutual promises and other good and
valuable consideration, the parties agree as follows:

SECTION 1.    DEFINITIONS.

    The terms used in this Agreement have the following meaning:

     1.1 The term "Adenosine A(1) Antagonist" shall mean a molecule that
[  *  ]

- --------------------------
 * Confidential treatment requested.

                                     1.

<PAGE>

compound being referred to herein as a "Test Compound"), the [  *  ] and such 
Test Compound meets the following specifications measured concurrently in a 
validated in vitro assay:

         (I)  [  *  ]

         (II) [  *  ]

    Notwithstanding the foregoing, if CVT is able to establish in a model 
reasonably acceptable to BIOGEN that the principal activity of a Test 
Compound IN VIVO is as an [  *  ] such Test Compound shall be excluded from 
the definition of Adenosine A(1) Antagonists. 

     1.2 The term "AFFILIATE" as applied to either party shall mean any 
company or other legal entity other than the party in question, in whatever 
country organized, controlling, controlled by or under common control with 
that party. The term "control" means ownership or control, directly or 
indirectly, of at least fifty percent (50%) of the outstanding stock or 
voting rights or the right to elect or appoint a majority of the directors.

     1.3 The term "first AGREEMENT YEAR" shall mean the twelve month period 
commencing on the EFFECTIVE DATE.  With respect to any year after the first 
AGREEMENT YEAR, the term "AGREEMENT YEAR" shall mean the twelve month period 
commencing upon an anniversary of the Effective Date.

     1.4 The term "BIOGEN CVT-124 TECHNOLOGY" shall mean any information, 
data (including all chemical, pharmacological, toxicological, clinical, 
assay, manufacturing and control information, data and test results, 
including negative results), ideas, concepts, formulas, trade secrets, 
methods, procedures, designs, materials, compositions, plans, diagrams, 
applications, specifications, techniques, records, practices, processes, 
research, know-how, inventions, discoveries and the like first conceived and 
first reduced to practice by BIOGEN or its AFFILIATES in the performance of 
any of its work under or pursuant to the BIOGEN AGREEMENT which are necessary 
or useful for the manufacture or use of CVT-124 or other PRODUCTS.  

     1.5 The term "BIOGEN CVT-124 PATENTS" shall mean all patents and pending 
patent applications (which for purposes of this Agreement shall be deemed to 
include certificates of invention and applications for certificates of 
invention and priority rights, provisional patent applications, statutory 
invention 

- --------------------------
 * Confidential treatment requested.

                                     2.

<PAGE>

registrations, applications for statutory invention registrations, and any 
foreign equivalents thereof) owned by BIOGEN or its AFFILIATES throughout the 
TERRITORY which claim the BIOGEN CVT-124 TECHNOLOGY or any part thereof, 
including any provisional applications, substitutions, extensions, reissues, 
reexaminations, renewals, continuations, continuations-in-part, divisionals 
and supplemental protection certificates. 

     1.6 The term "CALENDAR QUARTER" shall mean the period of three (3) 
consecutive calendar months ending on March 31, June 30, September 30 or 
December 31, as the case may be.

     1.7 The term "CVT-124" shall mean the [  *  ] of epoxy norbornyl 
xanthine, as defined as CVT-124 in the IND filed on September 20, 1995 and as 
further described in U.S. Patent Application Serial No. [  *  ].

     1.8 The term "CVT PATENT RIGHT(S)" shall mean all patents and pending 
patent applications (which for purposes of this Agreement shall be deemed to 
include certificates of invention and applications for certificates of 
invention and priority rights, provisional patent applications, statutory 
invention registrations, applications for statutory invention registrations, 
and any foreign equivalents thereof) throughout the TERRITORY that claim CVT 
TECHNOLOGY or any part thereof, including any provisional applications, 
substitutions, extensions, reissues, reexaminations, renewals, continuations, 
continuations-in-part, divisionals and supplemental protection certificates, 
which CVT owns (in whole or in part) or to which CVT otherwise has a 
transferable right as of the EFFECTIVE DATE or at any time during the term of 
this Agreement, including but not limited to CVT's rights in any RESEARCH 
PATENT RIGHTS and CVT's rights obtained under the UFRFI LICENSE.  CVT PATENT 
RIGHTS as of the EFFECTIVE DATE are set forth in APPENDIX A hereto.

     1.9 "CVT TECHNOLOGY" shall mean any information, data (including all 
chemical, pharmacological, toxicological, clinical, assay, manufacturing and 
control information, data and test results, including negative results), 
ideas, concepts, formulas, trade secrets, methods, procedures, designs, 
materials, compositions, plans, diagrams, applications, specifications, 
techniques, records, practices, processes, research, know-how, inventions, 
discoveries and the like which CVT owns (in whole or in part) or to which CVT 
otherwise has a transferable right as of the EFFECTIVE DATE or at any time 
during the term of this Agreement, which relate to CVT-124 or any other 
Adenosine A(1) Antagonist, including but not limited to CVT's rights in the 

- --------------------------
 * Confidential treatment requested.

                                     3.

<PAGE>

RESEARCH INFORMATION, the RESEARCH MATERIALS and the RESEARCH INVENTIONS, and 
CVT's rights under the UFRFI LICENSE.

     1.10     The term "EFFECTIVE DATE" shall mean March 10, 1997.

     1.11     The term "FTE" shall mean the equivalent of a full year of 
effort on a full time basis of a scientist or other professional possessing 
skills and experience necessary to carry out applicable tasks under the 
RESEARCH PROGRAM.

     1.12     The term "FIRST COMMERCIAL SALE" shall mean the initial 
transfer by BML or any of its AFFILIATES or SUBLICENSEES of a PRODUCT to a 
THIRD PARTY in exchange for consideration, following marketing approval by 
the appropriate governmental agency for the country in which the transfer is 
made.

     1.13     The term "MAA" shall mean an application for regulatory 
approval to sell  PRODUCT in the European Union and similar in purpose to an 
NDA in the United States.

     1.14     The term "MAJOR MARKET(s)" shall mean any of the Japan, 
Germany, France and/or the United Kingdom.

     1.15     The term "NDA" shall mean a New Drug Application or Product 
License Application or equivalent filing filed for PRODUCT with the U.S. Food 
and Drug Administration ("FDA").

     1.16     The term "NDR" shall mean an application for regulatory 
approval to sell PRODUCT in Japan and similar in purpose to an NDA in the 
United States.

     1.17     The term "NET SALES" shall mean [  *  ] BML and 
its AFFILIATES with respect to the sale of PRODUCT, less: 

              (i)  trade, quantity, cash or other discounts [  *  ] allowed 
not exceeding amounts customary in the trade, including, without limitation, 
governmental program discounts and rebates (e.g., Medicaid, Medicare, VA, 
etc.)

              (ii)  sales taxes, tariff duties and/or use taxes directly 
imposed on and with reference to particular sales;

- --------------------------
 * Confidential treatment requested.

                                     4.

<PAGE>

              (iii)  packing, transportation and insurance prepaid or allowed; 
and

              (iv)  amounts allowed or credited on rejects, returns or 
retroactive price reductions.

A sale or transfer of PRODUCT by BML to an AFFILIATE for re-sale of PRODUCT 
by such AFFILIATE shall not be considered a sale for the purpose of this 
provision but the resale of PRODUCT by such AFFILIATE to a THIRD PARTY shall 
be a sale for such purposes.  A "sale" shall mean a transfer or other 
disposition for consideration, but shall not include transfers or 
dispositions at no cost for pre-clinical, clinical, regulatory or 
governmental purposes or disposition of PRODUCT at no cost for promotional 
purposes.  

    In the event that PRODUCT is sold in the form of  a combination product 
containing one or more active ingredients or components in addition to 
CVT-124 or, if applicable, another Adenosine A(1) Antagonist, NET SALES shall 
be determined by multiplying NET SALES of the combination product (as defined 
by reference to the standard NET SALES definition) during the applicable 
payment period by the fraction A/A+B where A is the average sale price of 
PRODUCT when sold separately in finished form and B is the average sale price 
of the other active ingredients or components when sold separately in 
finished form in each case during the applicable payment period in the 
country in which the sale of the combination product was made, or if sales of 
both the PRODUCT and the other active ingredients or components did not occur 
in such period, then in the most recent payment period in which sales of both 
occurred.  In the event that such average sale price cannot be determined for 
both PRODUCT and all other active ingredients or components included in the 
combination product, NET SALES for purposes of determining payments under 
this Agreement shall be calculated by multiplying the NET SALES of the 
combination product by the fraction C/C+D where C is the fair market value of 
the CVT-124 (or other Adenosine A(1) Antagonist) contribution to the 
combination and D is the sum of the fair market values of all other active 
components or ingredients included in the combination product, in each case, 
as determined by BML in good faith. 

     1.18     The term "OPERATING COMMITTEE" shall have the meaning set forth 
in Section 7.1 of the BIOGEN AGREEMENT.

     1.19     The term "PHASE II PERFORMANCE ASSESSMENT STUDY" shall have the 
meaning set forth in the BIOGEN AGREEMENT.



                                     5.

<PAGE>

     1.20     The term "PHASE III TRIAL" shall mean a randomized clinical 
trial designed to show efficacy and safety of a PRODUCT and intended to be 
submitted as part of the application for marketing approval of such PRODUCT.

     1.21     The term "PRODUCT" shall mean any article, composition or 
material that comprises, contains or is CVT-124 or another Adenosine A(1) 
Antagonist, the manufacture, import, use or sale of which is covered by a 
VALID CLAIM of the CVT PATENT RIGHTS or includes any of the CVT TECHNOLOGY.

     1.22     The term "RESEARCH INFORMATION" shall mean any data, results, 
formulas, process information or other information which results from the 
RESEARCH PROGRAM.

     1.23     The term "RESEARCH INVENTION(S)" shall mean any invention, 
know-how, method, process, use, article of manufacture, or composition of 
matter conceived or first actually or constructively reduced to practice as 
part of the RESEARCH PROGRAM or which results from the RESEARCH PROGRAM.

     1.24     The term "RESEARCH MATERIAL" shall mean any material, reagent 
or substance which results from the RESEARCH PROGRAM.

     1.25     The term "RESEARCH PATENT RIGHT(S)" shall mean all patents and 
patent applications throughout the TERRITORY that claim RESEARCH INFORMATION, 
RESEARCH INVENTIONS or RESEARCH MATERIAL or any part thereof, including any 
provisional applications, substitutions, extensions, reissues, 
reexaminations, renewals, continuations, continuations-in-part, divisionals 
and supplemental protection certificates, statutory invention registrations, 
applications for statutory invention registrations, and any foreign 
equivalents thereof.

     1.26     The term "RESEARCH PLAN" shall mean the written descriptions of 
the research and development to be performed by CVT as part of the RESEARCH 
PROGRAM for the first AGREEMENT YEAR and for each subsequent AGREEMENT YEAR 
of the RESEARCH PROGRAM as approved in accordance with Section 8.2 of the 
BIOGEN AGREEMENT.

     1.27     The term "RESEARCH PROGRAM" shall have the meaning set forth in 
Section 8.1 of the BIOGEN AGREEMENT.   

     1.28     The term "SUBLICENSE INCOME" shall mean any royalties or other 
consideration received by a party hereto from any SUBLICENSEES in 


                                     6.

<PAGE>

respect of sales of PRODUCTS, excluding amounts paid to such party for 
research or other services conducted by such party, for clinical trials, for 
purchases of PRODUCTS or of other goods or products at fair market value, or 
for equity investments at fair market value in such party.

     1.29     The term "SUBLICENSEE" shall mean any non-AFFILIATE third party 
expressly licensed by BML to make, have made or formulate any PRODUCT and to 
sell the PRODUCT made or formulated.  A SUBLICENSEE shall not include a 
distributor or other party licensed to sell PRODUCT but not to make, have 
made or formulate PRODUCT.

     1.30     The term "TERRITORY" shall mean all countries and territories 
of the world except:  the United States, including Puerto Rico, Guam and all 
other territories of the United States, and all other countries and 
territories in North America and South America.

     1.31     The term "THIRD PARTY(IES)" shall mean a person or entity who 
or which is neither a party hereto nor an AFFILIATE or SUBLICENSEE of a party 
hereto.

     1.32     The term "UFRFI LICENSE" shall mean a certain License Agreement 
dated as of June 27, 1994 by and between CVT and University of Florida 
Research Foundation, Inc. ("UFRFI"), as amended.

     1.33     The term "VALID CLAIM" shall mean (i) a claim of a pending 
patent application which claim shall not have been canceled, withdrawn, 
abandoned or rejected by an administrative agency from which no appeal can be 
taken and which application shall not have been pending for more than 
[  *  ] or (ii) a claim of an issued and unexpired patent which has not 
lapsed or become abandoned or been declared invalid or unenforceable by a 
court of competent jurisdiction or an administrative agency from which no 
appeal can be or is taken.

     1.34     The use herein of the plural shall include the singular, and 
the use of the masculine shall include the feminine.

SECTION 2.    GRANT AND OTHER RIGHTS.

     2.1 CVT hereby grants to BML and BML hereby accepts from CVT an 
exclusive, royalty-bearing right and license under the CVT TECHNOLOGY and CVT 
PATENT RIGHTS to make, have made, import, use, offer for sale and sell 
PRODUCTS in the TERRITORY.  CVT shall be responsible for paying any 

- --------------------------
 * Confidential treatment requested.

                                     7.

<PAGE>

royalty obligations which CVT may have to any THIRD PARTY under agreements 
between CVT and such THIRD PARTIES in effect as of the EFFECTIVE DATE arising 
from the exercise of the license grant set forth above.

     2.2 (a)  AFFILIATES. BML shall have the full and unrestricted right to
extend the license granted to it herein to AFFILIATES.  BML shall advise CVT of
any such extension to AFFILIATES.

         (b)  SUBLICENSES. BML shall have the right to grant sublicenses in 
the TERRITORY under the license granted to it herein in accordance with the 
following:

              (i)  In [  *  ]

              (ii) In [  *  ] and in [  *  ] BML shall have the full and 
unrestricted right to grant sublicenses at any time after the [  *  ] for 
such PRODUCT, but may not grant a sublicense prior to that time.

    BML agrees to forward to CVT a copy of any sublicense agreements within 
thirty (30) days of the execution of such sublicense agreements and further 
agrees to forward to CVT annually a copy of such reports received by BML from 
its sublicensees during the preceding twelve (12) month period under the 
sublicenses as shall be pertinent to a royalty accounting under said 
sublicense agreements.

     2.3 To the extent CVT PATENT RIGHTS or CVT TECHNOLOGY licensed to BML 
under this Agreement are rights which CVT has licensed from UFRFI under the 
UFRFI LICENSE, BML and CVT understand and agree that the rights licensed to 
BML by CVT are subject to the terms of the UFRFI LICENSE.

SECTION 3.    INTENTIONALLY OMITTED

SECTION 4.    MANUFACTURE AND SUPPLY OF PRODUCT

     4.1 PRODUCT SUPPLY.  BML and its AFFILIATES shall be responsible for the 
manufacture and supply of PRODUCT hereunder for clinical trials and 
commercial sales in the TERRITORY.

- --------------------------
 * Confidential treatment requested.

                                     8.

<PAGE>

SECTION 5.    DUE DILIGENCE.

     5.1  BML shall use commercially reasonable efforts to market a PRODUCT 
in the TERRITORY.

SECTION 6.    CONFIDENTIALITY AND INFORMATION.

     6.1   During the term of this Agreement, it is contemplated that each 
party may disclose to the other, proprietary and confidential technology, 
inventions, technical information, material, reagents, biological materials 
and the like which are owned or controlled by the party providing such 
information or which that party is obligated to maintain in confidence 
("Confidential Information"). Each party shall have the right to refuse to 
accept the other party's Confidential Information.  Each party agrees not to 
disclose and to maintain the Confidential Information of the other party in 
strict confidence, to cause all of its agents, representatives and employees 
to maintain the disclosing party's Confidential Information in confidence and 
not to disclose any such Confidential Information to a third party without 
the prior written consent of the disclosing party and not to use such 
Confidential Information for any purpose other than as licensed under this 
Agreement.

     6.2   The obligations of confidentiality will not apply to information
which:

           (i)  was known to the receiving party or generally known to the 
public prior to its disclosure hereunder through no fault of the receiving 
party or any agent, representative or employee thereof; or

           (ii)  subsequently becomes known to the public by some means other 
than a breach of this Agreement, including publication and/or laying open to 
inspection of any patent applications or patents;

           (iii)  is subsequently disclosed to the receiving party by a third 
party having a lawful right to make such disclosure and who is not under an 
obligation of confidentiality to the disclosing party;

           (iv)  is approved for release by the parties. 

     6.3   The obligations of Section 6.1 notwithstanding, BML may disclose 
the Confidential Information of CVT licensed to BML hereunder (a) to 
SUBLICENSEES and (b) to THIRD PARTIES who (i) need to know the same in order 
to secure regulatory approval for the sale of PRODUCT, (ii) who need to know 
the same in order to work towards the commercial development of 


                                     9.

<PAGE>

PRODUCT or to manufacture PRODUCT, or (iii) who are approved by CVT, provided 
that such parties, other than regulatory authorities, are bound by 
obligations of confidentiality and non-use at least as stringent as those set 
forth herein.  Further, either party may disclose Confidential Information of 
the other party to the extent such disclosure is required by law, rule, 
regulation or bona fide legal process to be disclosed, provided that the 
receiving party takes all reasonable steps to restrict and maintain 
confidentiality of such disclosure and provides reasonable notice to the 
disclosing party.

     6.4   CVT shall provide to BML, or if required to the applicable 
regulatory authority, all documents and information, to the extent in CVT's 
possession or otherwise reasonably accessible to CVT with the right to 
disclose,  requested by the regulatory authority or reasonably requested by 
BML in support of BML's regulatory submissions.  Copies of all documents 
provided directly to a regulatory authority shall be provided to BML in 
advance, if practicable, or otherwise within [  *  ] of delivery to the 
regulatory authority.  In addition, CVT shall provide to BML any information, 
to the extent in CVT's possession or otherwise reasonably accessible to CVT 
with the right to disclose, related to PRODUCT that is (a) reasonably 
required in support of BML's applications to patent offices and such 
governmental offices as regulate the price of PRODUCT and/or (b) reasonably 
required to support a legal action by BML against a THIRD PARTY.

     6.5   Neither party may disclose the existence or terms of this 
Agreement without the prior written consent of the other party; provided, 
however, that either party may make such disclosure to the extent required by 
law.   The parties have approved an initial press release as set forth in 
APPENDIX D attached hereto.  Once any written statement is approved for 
disclosure by both parties, either party may make subsequent public 
disclosure of the contents of such statement without the further approval of 
the other party.

SECTION 7.    INTENTIONALLY OMITTED

SECTION 8.    INTENTIONALLY OMITTED

SECTION 9.    INTENTIONALLY OMITTED

SECTION 10.   COMPENSATION.

     10.1   (a)  BML shall make an equity investment in CVT upon execution of 
this Agreement in the amount of Five Million Dollars ($5,000,000) 

- --------------------------
 * Confidential treatment requested.

                                     10.

<PAGE>

in accordance with the terms of a stock purchase agreement of even date 
herewith (the "Stock Purchase Agreement").

            (b)  [  *  ] BML shall make the following additional equity 
investments in CVT during the Term of this Agreement:

                 (i)  Upon execution of this Agreement, BML shall make an 
equity investment in CVT in the amount of Two Million Dollars ($2,000,000) in 
accordance with the terms of the Stock Purchase Agreement.

                 (ii) Upon [  *  ] BML shall make an equity investment in 
CVT in the amount of an additional [  *  ] in accordance with the terms of 
the Stock Purchase Agreement, unless either CVT or BIOGEN has delivered 
notice of termination of the RESEARCH PROGRAM prior to such date in 
accordance with Section 8.5 of the BIOGEN AGREEMENT.

                  (iii) Upon [  *  ] BML shall make an equity investment in 
CVT in the amount of an additional [  *  ] in accordance with the terms of 
the Stock Purchase Agreement, unless either CVT or BIOGEN has delivered 
notice of termination of the RESEARCH PROGRAM prior to such date in 
accordance with Section 8.5 of the BIOGEN AGREEMENT.

            (c)  Notwithstanding any contrary provision of this Agreement or 
of the Stock Purchase Agreement, in no event shall BML be required to make 
any equity investment in CVT which would result in BML and its AFFILIATES 
owning greater than 19.9% of CVT's shares of Common Stock  outstanding, 
after such investment.

     10.2   (a)  BML shall pay to CVT royalties on NET SALES of PRODUCTS in 
the TERRITORY ("Royalties") as follows: 

                 (i)  Royalties payable to CVT on NET SALES of PRODUCTS in 
the TERRITORY shall be [  *  ] and determined based on worldwide annual 
NET SALES (i.e., including NET SALES of   PRODUCTS under the BIOGEN 
AGREEMENT) in each calendar year in accordance with the following table:

    [  *  ] Annual Net Sales               Royalty
    ------------------------------------------------
    Up to [  *  ] Million                  [  *  ]


- --------------------------
 * Confidential treatment requested.

                                     11.

<PAGE>

    [  *  ] Million to [  *  ] Million     [  *  ]

    Over [  *  ] Million                   [  *  ]

                 (ii)  Notwithstanding subparagraph (i) above, in the event 
there are two consecutive twelve month periods in which worldwide NET SALES 
exceed [  *  ] Million but are less than [  *  ] Million, then, unless 
subparagraph (iii) applies, Royalties shall thereafter be determined based on 
annual worldwide NET SALES in any subsequent calendar year in accordance with 
the following table:

    [  *  ] Annual Net Sales                Royalty
    -----------------------------------------------
    Up to [  *  ] Million                   [  *  ]

    [  *  ] Million to [  *  ] Million      [  *  ]

                 (iii) Notwithstanding subparagraph (ii), if at any time 
after paragraph (ii) applies worldwide NET SALES exceed [  *  ] Million for 
one full twelve month period or are less than [  *  ] Million for one full 
twelve month period, the Royalties owed on NET SALES shall thereafter be 
determined in accordance with subparagraph (i), regardless of the subsequent 
annual overall levels of NET SALES.

                 (iv)  Royalties shall be payable under this Agreement solely 
for PRODUCT sold in the TERRITORY.  However, for the purposes of determining 
the applicable [  *  ] royalty rate, worldwide annual NET SALES shall be 
deemed to include NET SALES under both this Agreement and the BIOGEN 
AGREEMENT.

            (b)  Notwithstanding the foregoing, if the use or sale of PRODUCT 
by BML or its AFFILIATES in the country in which the PRODUCT is sold is not 
covered by a VALID CLAIM of a CVT PATENT RIGHT in such country, the Royalties 
payable with respect to NET SALES in such country shall be [  *  ] of the 
amounts otherwise due pursuant to Section 10.2(a) above; PROVIDED, however, 
that if, in any such country, any one or more THIRD PARTY(S)  is/are selling 
a generic version of the PRODUCT being sold by BML or its AFFILIATES and such 
THIRD PARTY(S)' sales of such generic product exceeds [  *  ] of BML's sales 
of the PRODUCT in such country, the Royalties in such country shall be 
reduced to [  *  ] during such period of generic sales.

- --------------------------
 * Confidential treatment requested.

                                     12.

<PAGE>

            (c)  The obligation to pay Royalties for each PRODUCT shall 
continue on a country-by-country and product-by-product basis until the last 
to expire VALID CLAIM of the CVT PATENT RIGHTS in such country covering such 
PRODUCT; provided, however, that in any country in which there is no such 
VALID CLAIM, the obligation to pay Royalties shall continue only until the 
expiration of [  *  ] from the FIRST COMMERCIAL SALE of such PRODUCT 
in such country by BML or its AFFILIATES or SUBLICENSEES.

            (d)  (i)  In the event that after the EFFECTIVE DATE BML becomes 
obligated to pay any royalties or other sums to THIRD PARTIES because the 
manufacture, use or sale of CVT-124 or another Adenosine A(1)  Antagonist 
contained in a PRODUCT sold by BML hereunder in the TERRITORY infringes such 
THIRD PARTIES' intellectual property  rights, then BML shall be entitled to 
credit [  *  ] of any such obligations against Royalties due to CVT pursuant 
to this Section 10.2.

                 (ii) In the event that after the EFFECTIVE DATE BML becomes 
obligated to pay any royalties or other sums to THIRD PARTIES because the 
manufacture, use or sale of a PRODUCT sold by BML hereunder in the TERRITORY 
infringes such THIRD PARTIES' intellectual property  rights on account of a 
fact other than [  *  ] then the matter shall be referred to the Oversight 
Committee set up pursuant to the BIOGEN AGREEMENT to determine in good faith 
whether or not BML shall be entitled to a credit of up to [  *  ] of any such 
obligations against Royalties due to CVT pursuant to this Section 10.2. In 
the event the Oversight Committee cannot agree within forty-five (45) days 
after referral of the matter to them for resolution, then the [  *  ] 
representatives to the Oversight Committee shall [  *  ] 

(iii) In no event shall any credits under subsections (d)(i) and (d)(ii), or 
any cost-sharing pursuant to subsection (e) below, reduce Royalties payable 
to CVT hereunder for any CALENDAR QUARTER by more than [  *  ] of the amounts 
otherwise due.  [  *  ]

            (e)  Intentionally Omitted.

            (f)  NET SALES of PRODUCT in a country in the TERRITORY for which 
BML has no royalty obligation, pursuant to Section 


- --------------------------
 * Confidential treatment requested.

                                     13.

<PAGE>

10.2(c) shall not be included in the calculation of the level of NET SALES 
for purposes of Section 10.2(a).

            (g)  In addition to the foregoing, CVT shall receive a percentage 
of BML's SUBLICENSE INCOME in accordance with this subsection (g).  

                 (i)  In MAJOR MARKET countries, CVT shall receive [  *  ] of 
SUBLICENSE INCOME, subject to the following floors and cap.  For sublicenses 
executed prior to the [  *  ] in no event shall CVT receive less than [  *  ] 
of net sales of SUBLICENSEES (calculated using the NET SALES definition) for 
any PRODUCTS covered by a VALID CLAIM of CVT PATENT RIGHTS in the country in 
which they are sold.  For sublicenses executed after the [  *  ] in no event 
shall CVT receive pursuant to this subsection less than [  *  ] of net sales 
of SUBLICENSEES (calculated using the NET SALES definition) for any PRODUCTS 
covered by a VALID CLAIM of CVT PATENT RIGHTS in the country in which they 
are sold.  Notwithstanding the foregoing, if the use or sale of PRODUCT by a 
SUBLICENSEE in the country in which the PRODUCT is sold is not covered by a 
VALID CLAIM of a CVT PATENT RIGHT in such country, the minimum percentages 
set forth in the previous two sentences shall be [  *  ] respectively. In no 
event shall CVT receive pursuant to this subsection an amount greater than 
the Royalties which would have been due pursuant to this Section 10.2 on NET 
SALES of SUBLICENSEES if such NET SALES had been made by BML.

                 (ii) In non-MAJOR MARKET countries, CVT shall receive [  *  ]
 of SUBLICENSE INCOME, subject to the following floors and cap.  In no event 
shall CVT receive pursuant to this subsection less than [  *  ] of net sales 
of SUBLICENSEES (calculated using the NET SALES definition) for any PRODUCTS 
covered by a VALID CLAIM of CVT PATENT RIGHTS in the country in which they 
are sold.  Notwithstanding the foregoing, if the use or sale of PRODUCT by a 
SUBLICENSEE in the country in which the PRODUCT is sold is not covered by a 
VALID CLAIM of a CVT PATENT RIGHT in such country, the minimum percentage set 
forth in the previous sentence shall be [  *  ] In no event shall CVT receive 
pursuant to this subsection an amount greater than the Royalties which would 
have been due pursuant to this Section 10.2 on NET SALES of SUBLICENSEES if 
such NET SALES had been made by BML.

- --------------------------
 * Confidential treatment requested.

                                     14.

<PAGE>

     10.3   (a)  BML shall pay the following amount within fifteen (15) days 
of the occurrence of the following milestone event with respect to the first 
PRODUCT to reach such milestone:

Milestone                              Amount
- ---------                              ------

Notice by BIOGEN of         [  *  ] equity investment
decision to commence        pursuant to the Stock Purchase
Phase III Trial             Agreement
[  *  ]

            (b)  In the event BIOGEN does not [  *  ] and this Agreement has 
not been terminated,  and (i) [  *  ] planning or ongoing and (ii) no 
material health or safety issue has arisen with respect to the clinical use 
of PRODUCT, BML will make the equity investment as set forth in Section 
10.3(a) above as if it had reached such milestone at such time, but such 
equity investment shall not be due thereafter when a [  *  ] is actually 
commenced.

     10.4     BML shall keep, and shall cause each of its AFFILIATES to keep, 
full and accurate books of account containing all particulars relevant to its 
sales of PRODUCTS that may be necessary for the purpose of calculating all 
compensation payable to CVT hereunder.  Such books of account shall be kept 
at their principal place of business and for the three (3) years next 
following the end of the calendar year to which each shall pertain, be open 
for inspection by an independent certified public accountant reasonably 
acceptable to BML, upon reasonable notice during normal business hours at 
CVT's expense for the sole purpose of verifying compensation due under this 
Agreement.  In the event the inspection determines that compensation due CVT 
for any period has been underpaid by [  *  ] or more, then BML shall pay for 
all costs of the inspection, otherwise the costs of the inspection shall be 
borne by CVT.  In all cases, BML shall pay to CVT any underpaid compensation 
promptly and CVT shall promptly pay to BML any overpaid compensation.  All 
information and data reviewed in the inspection shall be used only for the 
purpose of verifying compensation due and shall be treated as BML 
Confidential Information subject to the obligations of this Agreement.  No 
audit by an agent of CVT shall occur more frequently than once during any 
twelve (12) month period.

     10.5     In each year the amount of compensation due shall be calculated 
quarterly as of the end of each CALENDAR QUARTER and shall be paid quarterly 
within the [  *  ] days next following such date, unless such 

- --------------------------
 * Confidential treatment requested.

                                     15.

<PAGE>

CALENDAR QUARTER is the last CALENDAR QUARTER of the year, in which case the 
compensation due shall be paid within [  *  ] days next following such 
date.  Every such payment shall be supported by the accounting prescribed in 
Section 10.6 and shall be made in United States currency.  Whenever for the 
purpose of calculating compensation, conversion from any foreign currency 
shall be required, such conversion shall be at the rate of exchange published 
in The Wall Street Journal for the last business day of the CALENDAR QUARTER.

     10.6   With each quarterly payment, BML shall deliver to CVT a full 
and accurate accounting to include at least the following information:

            (a)  Total billings for PRODUCT subject to Royalty;

            (b)  Deductions applicable as provided in Section 1.17;

            (c)  Applicable royalty rates (including any credits as provided 
in Section 10.2(b) or (d));

            (d)  SUBLICENSEE income and royalties thereon; and

            (e)  Total compensation payable to CVT.

     10.7   If the transfer of or the conversion into United States Dollars 
of any remittance due hereunder is not lawful or possible in any country, 
such remittance shall be made by the deposit thereof in the currency of the 
country to the credit and account of CVT or its nominee in any commercial 
bank or trust company located in that country, prompt notice of which shall 
be given to CVT. CVT shall be advised in writing in advance by BML and 
provide to BML a nominee, if so desired.

     10.8   Any tax required to be withheld by BML under the laws of any 
foreign country (i.e., other than the Channel Islands) for the account of 
CVT, shall be promptly paid by BML for and on behalf of CVT to the 
appropriate governmental authority, and BML shall use its best efforts to 
furnish CVT with proof of payment of such tax.  Any such tax actually paid on 
CVT's behalf shall be deducted from royalty payments due CVT.

     10.9   Compensation shall be due and payable for the manufacture, use 
and sale of an individual PRODUCT only once with respect to the same unit of 
PRODUCT irrespective of the number of patents or claims thereof which cover 
the manufacture, use and sale of such PRODUCT.  In no event shall 
compensation be due and payable hereunder for the manufacture, use or sale of 

- --------------------------
 * Confidential treatment requested.

                                     16.

<PAGE>

an individual PRODUCT for which CVT receives compensation in the way of 
royalties under the BIOGEN AGREEMENT.

     10.10    BML hereby indemnifies CVT against, and agrees to pay on CVT's 
behalf, any taxes that are required under the laws of the Channel Islands to 
be withheld by BML or paid by CVT on account of any of the payments made by 
BML to CVT hereunder, and no such withholding or payment shall reduce the 
amounts otherwise payable to CVT hereunder.

SECTION 11.   REPRESENTATIONS AND WARRANTIES.

     11.1     Each party represents and warrants to the other party that: (i) 
it is free to enter into this Agreement; (ii) in so doing, it will not 
violate any other agreement to which it is a party; and (iii) it has taken 
all corporate action necessary to authorize the execution and delivery of 
this Agreement and the performance of its obligations under this Agreement.

     11.2     (a)  Each party represents that it is not aware of any action, 
suit, inquiry or investigation or any claim, demand or notice of default 
which if adversely determined would affect the rights granted under this 
Agreement.

              (b)  Each party acknowledges that in entering into this 
Agreement the other party has relied upon information supplied by the 
disclosing party, including, in the case of information supplied by CVT, data 
and information concerning CVT-124 and preclinical and clinical studies and 
information related to CVT PATENT RIGHTS.  Neither party is aware of any data 
or information given to the other party which is untrue or inaccurate or of 
any other data or information which is necessary to make the data and 
information provided to the other party complete and not misleading.  To the 
best of CVT's knowledge, [  *  ]

     11.3     CVT hereby represents, warrants and covenants to BML that:

              (a)  It is the [  *  ] under this Agreement and has the right 
and has taken all necessary action to [  *  ] provided that the foregoing 
shall not be interpreted as a warranty of non-infringement;

              (b)  To the best of CVT's knowledge, CVT has disclosed to BML 
all facts that CVT reasonably believes to be [  *  ]

- --------------------------
 * Confidential treatment requested.

                                     17.

<PAGE>

known to CVT as of the EFFECTIVE DATE;

              (c)  All patent applications included in CVT PATENT RIGHTS 
existing as of the Effective Date are pending and have not been abandoned;

              (d)  CVT [  *  ] to BML pursuant to this Agreement.

              (e)  CVT will not take any action that would in any way prevent 
CVT from granting the rights granted to BML under this Agreement with respect 
to CVT PATENT RIGHTS or CVT TECHNOLOGY acquired after the EFFECTIVE DATE or 
which would otherwise [  *  ] BML under this Agreement.  Nothing herein shall 
prohibit the amendment or modification of the scope of claims during the 
patent prosecution process.

              (f)  CVT will take all actions required by it to maintain its 
rights under the UFRFI LICENSE as in effect on the EFFECTIVE DATE, and shall 
immediately send to BML any notice of default or breach received by CVT under 
the UFRFI LICENSE.

              (g)  All employees of CVT who perform research and development 
for CVT in connection with CVT's obligations under this Agreement are 
required to assign their rights in any intellectual property arising from 
such work to CVT.

              (h)  Appendix A contains a complete and accurate list of all 
CVT PATENT RIGHTS in existence as of the EFFECTIVE DATE.

              (i)  CVT will not enforce any patent rights owned or controlled 
by it to prevent the manufacture, use or sale of any PRODUCT for which BML 
has a royalty obligation to CVT hereunder subject to the license granted 
herein by BML or its AFFILIATES or SUBLICENSEES, or any person or entity 
purchasing a PRODUCT from any of them.

     11.4     CVT represents that it has not as of the EFFECTIVE DATE [  *  ] 
the manufacture, use or sale of PRODUCT and it is not aware of any 
infringement by a THIRD PARTY of the CVT PATENT RIGHTS.

- --------------------------
 * Confidential treatment requested.

                                     18.

<PAGE>

SECTION 12.   INDEMNIFICATION.

     12.1     INDEMNIFICATION BY BML.  BML will defend, indemnify and hold 
harmless CVT, its AFFILIATES  and their employees, agents, officers, 
shareholders and directors and each of them (the "CVT Indemnified Parties") 
from and against any and all third party claims, causes of action and costs 
(including reasonable attorney's fees) of any nature made or lawsuits or 
other proceedings filed or otherwise instituted against the CVT Indemnified 
Parties resulting from or arising out of the manufacture, use or sale of any 
PRODUCT by BML, its AFFILIATES or SUBLICENSEES, other than those claims which 
result or arise from breach of this Agreement by CVT or failure by CVT to 
comply in any material respect with applicable laws or regulations or the 
negligence or willful misconduct of CVT or any its AFFILIATES or any of their 
employees, agents, officers,  shareholders or directors.

     12.2     INDEMNIFICATION BY CVT.  CVT will defend, indemnify and hold 
harmless BML, its AFFILIATES and their employees, agents, officers, 
shareholders and directors and each of them (the "BML Indemnified Parties") 
from and against any and all third party claims, causes of action and costs 
(including reasonable attorney's fees) of any nature made or lawsuits or 
other proceedings filed or otherwise instituted against any of the BML 
Indemnified Parties resulting from or arising out of breach of this Agreement 
by CVT or failure of CVT to comply in any material respect with applicable 
laws or regulations or the negligence or willful misconduct of CVT or its 
AFFILIATES or any of their employees, agents, officers, shareholders or 
directors. 

     12.3     CONDITIONS TO INDEMNIFICATION.  A person or entity that intends 
to claim indemnification under this Section (the "Indemnitee") shall promptly 
notify the indemnifying party (the "Indemnitor") of any loss, claim, damage, 
liability or action in respect of which the Indemnitee intends to claim such 
indemnification, and the Indemnitor shall assume the defense thereof with 
counsel mutually satisfactory to the Indemnitee whether or not such claim is 
rightfully brought; provided, however, that an Indemnitee shall have the 
right to retain its own counsel, with the fees and expenses to be paid by the 
Indemnitor if Indemnitor does not assume the defense, or if representation of 
such Indemnitee by the counsel retained by the Indemnitor would be 
inappropriate due to actual or potential differing interests between such 
Indemnitee and any other person represented by such counsel in such 
proceedings.  The indemnity agreement in this Section shall not apply to 
amounts paid in settlement of any loss, claim, damage, liability or action if 
such settlement is effected without the consent of the Indemnitor, which 
consent shall not be withheld or delayed unreasonably.  


                                     19.

<PAGE>

The failure to deliver notice to the Indemnitor within a reasonable time 
after the commencement of any such action, only if prejudicial to its ability 
to defend such action, shall relieve such Indemnitor of any liability to the 
Indemnitee under this Section, but the omission so to deliver notice to the 
Indemnitor will not relieve it of any liability that it may have to any 
Indemnitee otherwise than under this Section.  The Indemnitee under this 
Section, its employees and agents, shall cooperate fully with the Indemnitor 
and its legal representatives in the investigations of any action, claim or 
liability covered by this indemnification.

SECTION 13.   ASSIGNMENT; SUCCESSORS.

     13.1     This Agreement shall not be assignable by either of the parties 
without the prior written consent of the other party (which consent shall not 
be unreasonably withheld), except that BML without the consent of CVT may 
assign this Agreement or any of its rights and obligations hereunder to an 
AFFILIATE or to an entity with which BML shall merge or consolidate or to 
which BML shall sell or assign all or substantially all of its assets, and 
except that CVT without the consent of BML may assign this Agreement to an 
entity with which CVT shall merge or consolidate or to which CVT shall sell 
or assign all or substantially all of its assets.

     13.2     Subject to the limitations on assignment herein, this Agreement 
shall be binding upon and inure to the benefit of said successors in interest 
and assigns of CVT and BML. 

SECTION 14.   TERMINATION.

     14.1     Except as otherwise specifically provided herein and unless 
sooner terminated pursuant to Sections 14.2, 14.3, 14.4 or 14.9 of this 
Agreement, this Agreement and the licenses and rights granted hereunder shall 
remain in full force and effect until BML's obligations to pay compensation 
hereunder terminate.  Upon expiration of BML's obligation to pay compensation 
hereunder with respect to a specific country and specific PRODUCT as to which 
BML's license is then in effect, the license granted to BML with respect to 
such country and such PRODUCT pursuant to Section 2.1 shall be deemed to be 
fully paid and BML shall thereafter have a royalty-free right to use the CVT 
PATENT RIGHTS and CVT TECHNOLOGY and to make, use, import and sell such 
PRODUCT in such country.

     14.2     Upon breach of any material provisions of this Agreement by 
either party to this Agreement, in the event the breach is not cured within 
[  *  ] days after written notice to the breaching party by the other 
party, in addition to 

- --------------------------
 * Confidential treatment requested.

                                     20.

<PAGE>

any other remedy it may have, the other party at its sole option may 
terminate this Agreement, provided that such other party is not then in 
breach of this Agreement.

     14.3     Either party to this Agreement may, upon giving notice of 
termination, immediately terminate this Agreement upon receipt of notice that 
the other party has become insolvent or has suspended business in all 
material respects hereof, or has consented to an involuntary petition 
purporting to be pursuant to any reorganization or insolvency law of any 
jurisdiction, or has made an assignment for the benefit of creditors or has 
applied for or consented to the appointment of a receiver or trustee for a 
substantial part of its property; provided, however, that the insolvency or 
bankruptcy of CVT shall not operate to terminate the licenses granted to BML 
hereunder unless BML elects to terminate the Agreement as provided herein, 
and BML may elect to retain its licenses as provided in 11 U.S.C. Section 356.

     14.4     In addition to the foregoing, within [  *  ] days of BIOGEN's 
receipt of the data from the [  *  ] BML may terminate this Agreement upon 
written notice in its sole discretion.  At any time after the [  *  ] BML may 
terminate this Agreement for any reason upon [  *  ] days prior written 
notice to CVT.  

     14.5     Upon any termination of this Agreement, BML shall be entitled 
to, but shall not be obligated to [  *  ] covered by this Agreement which 
exists as of the date of the termination, so long as BML [  *  ] in 
accordance with the same terms and conditions as set forth in this Agreement.

     14.6     The obligations of Sections 6 and 12, as well as Sections 14.5, 
14.6, 14.8,  15.4, and 15.8 and the repayment obligation under the Note(s) 
shall survive any termination of this Agreement.

     14.7     Intentionally Omitted.

     14.8     In the event that, following any termination of this Agreement, 
CVT, or its permitted successor or assignee, subsequently commercializes a 
PRODUCT by itself or in conjunction with a THIRD PARTY, CVT, or its permitted 
successor or assignee, shall pay a royalty to BML on sales of PRODUCT in the 
TERRITORY in accordance with the following:

- --------------------------
 * Confidential treatment requested.

                                     21.

<PAGE>

              (a)  If the Agreement has been terminated prior to receipt by 
CVT of the [  *  ] milestone payable in accordance with Section 10.3(a)(i) of 
the BIOGEN AGREEMENT [  *  ] and the manufacture, use or sale of the 
commercialized PRODUCT is covered by a VALID CLAIM of the BIOGEN CVT-124 
PATENTS or includes any of the BIOGEN CVT-124 TECHNOLOGY, CVT shall pay BML 
royalties on net sales of PRODUCT and a percentage of CVT'S SUBLICENSE INCOME 
as follows:

                   (i)  Royalties payable to BML shall be [  *  ] and 
determined based on worldwide annual net sales (calculated in accordance with 
the NET SALES definition set forth in Section 1.17 hereof, and including NET 
SALES under the BIOGEN AGREEMENT) in each calendar year in accordance with 
the following table:

    [  *  ] Annual Net Sales               Royalty
    -----------------------------------------------
    Up to [  *  ] Million                 [  *  ]

    [  *  ] Million to [  *  ] Million    [  *  ]

    Over [  *  ] Million                  [  *  ]

                   (ii) CVT shall pay to BML [  *  ] of SUBLICENSE INCOME 
received by it from sublicensees.  Prior to calculation of BML's [  *  ] CVT 
may deduct from SUBLICENSE INCOME any royalty paid by CVT to [  *  ] on 
account of sales of PRODUCT in the TERRITORY in such period.

              (b)  If the Agreement has been terminated after receipt by CVT 
of the [  *  ] but prior to completion of a [  *  ] of the PRODUCT, CVT shall 
pay BML royalties on net sales of PRODUCT and a percentage of SUBLICENSE 
INCOME as follows:

                   (i)  Royalties payable to BML shall be [  *  ] and 
determined based on worldwide annual net sales (calculated in accordance with 
the NET SALES definition set forth in Section 1.17 hereof, and including NET 
SALES under the BIOGEN AGREEMENT) in each calendar year in accordance with 
the following table:

    [  *  ] Annual Net Sales               Royalty
    -----------------------------------------------
    Up to [  *  ] Million                     [  *  ]


- --------------------------
 * Confidential treatment requested.

                                     22.

<PAGE>

    [  *  ] Million to [  *  ] Million        [  *  ]

    Over [  *  ] Million                      [  *  ]

                   (ii) CVT shall pay to BML [  *  ] of 
SUBLICENSE INCOME received by it from sublicensees.  Prior to calculation of 
BML's [  *  ] share, CVT may deduct from SUBLICENSE INCOME any royalty paid by 
CVT to [  *  ] on account of sales of PRODUCT in the TERRITORY in such period.

              (c)  If the Agreement has been terminated after completion of a 
[  *  ] of the PRODUCT, but prior to the availability of [  *  ] CVT shall 
pay BML royalties on net sales of PRODUCT and a percentage of SUBLICENSE 
INCOME as follows:

                   (i)  Royalties payable to BML shall be [  *  ] and 
determined based on worldwide annual net sales (calculated in accordance with 
the NET SALES definition set forth in Section 1.17 hereof, and including NET 
SALES under the BIOGEN AGREEMENT) in each calendar year in accordance with 
the following table:

    [  *  ] Annual Net Sales               Royalty
    -----------------------------------------------
    Up to [  *  ] Million                  [  *  ]

    [  *  ] Million to [  *  ] Million     [  *  ]

    Over [  *  ] Million                   [  *  ]

                   (ii) CVT shall pay to BML [  *  ] of 
SUBLICENSE INCOME received by it from sublicensees.  Prior to calculation of 
BML's [  *  ] share, CVT may deduct from SUBLICENSE INCOME any royalty paid by 
CVT to [  *  ] on account of sales of PRODUCT in the TERRITORY in such period.

              (d)  If the Agreement has been terminated after the 
availability of [  *  ] of the PRODUCT, CVT shall pay BML royalties on net 
sales of PRODUCT and a percentage of SUBLICENSE INCOME as follows:

                   (i)  Royalties payable to BML shall be [  *  ] and 
determined based on worldwide annual net sales (calculated in accordance with 

- --------------------------
 * Confidential treatment requested.

                                     23.

<PAGE>

the NET SALES definition set forth in Section 1.17 hereof, and including NET 
SALES under the BIOGEN AGREEMENT) in each calendar year in accordance with 
the following table:

    [  *  ] Annual Net Sales               Royalty
    -----------------------------------------------
    Up to [  *  ] Million                  [  *  ]

    [  *  ] Million to [  *  ] Million     [  *  ] 

    Over [  *  ] Million                   [  *  ]

                   (ii) CVT shall pay to BML [  *  ] of 
SUBLICENSE INCOME received by it from sublicensees.  Prior to calculation of 
BML's [  *  ] share, CVT may deduct from SUBLICENSE INCOME any royalty paid by 
CVT to [  *  ] on account of sales of PRODUCT in the TERRITORY in such period.

              (e)  In the event that after the EFFECTIVE DATE CVT becomes 
obligated to pay any royalties or other sums to THIRD PARTIES because the 
manufacture, use or sale of PRODUCTS in the TERRITORY infringes the 
intellectual property rights of such THIRD PARTIES, CVT shall be entitled to 
credit [  *  ] of any such obligations against Royalties due to BML pursuant 
to this Section 14.8; provided, however, that in no event shall such credit 
reduce Royalties payable to BML hereunder for any CALENDAR QUARTER by more 
than [  *  ] of the amounts otherwise due.  [  *  ]

              (f)  CVT shall keep full and accurate books of account 
containing all particulars relevant to its sales of PRODUCTS that may be 
necessary for the purpose of calculating all compensation payable to BML 
hereunder, and shall be subject to the same provisions as are contained in 
Section 10.4 hereof.

              (g)  All payments due to BML pursuant to this Section 14.8 
shall be made in accordance with Sections 10.5, 10.6 (excluding the section 
references therein), 10.7 and 10.8 hereof, in each case substituting CVT for 
ML as appropriate, and vice versa.

     14.9     This Agreement shall automatically terminate upon the 
termination of the BIOGEN AGREEMENT.

- --------------------------
 * Confidential treatment requested.

                                     24.

<PAGE>

SECTION 15.   GENERAL PROVISIONS.

     15.1     Neither party shall be liable to the other party for damages or 
loss occasioned by failure of performance by the defaulting party if the 
failure is occasioned by war, fire, explosion, flood, strike or lockout, 
embargo, or any similar cause beyond the control of the defaulting party, 
provided that the party claiming this exception has exerted all reasonable 
efforts to avoid or remedy such event and provided such event does not extend 
for more than six (6) months. 

     15.2     The relationship between CVT and BML is that of independent 
contractors.  CVT and BML are not joint venturers, partners, principal and 
agent, master and servant, employer or employee, and have no relationship 
other than as independent contracting parties.  CVT shall have no power to 
bind or obligate BML in any manner.  Likewise, BML shall have no power to 
bind or obligate CVT in any manner.

     15.3     This Agreement, the BIOGEN AGREEMENT, the Stock Purchase 
Agreement and the Loan Agreement between the parties of even date herewith 
set forth the entire agreement and understanding between the parties as to 
the subject matter hereof and supersede all prior agreements in this respect. 
 There shall be no amendments or modifications to these Agreements, except by 
a written document which is signed by both parties.

     15.4     This Agreement shall be construed and enforced in accordance 
with the laws of the State of Delaware, U.S.A. without reference to its 
choice-of-law principles.

     15.5     The headings in this Agreement have been inserted for the 
convenience of reference only and are not intended to limit or expand on the 
meaning of the language contained in the particular or section or paragraph.

     15.6     Any delay in enforcing a party's rights under this Agreement or 
any waiver as to a particular default or other matter shall not constitute a 
waiver of a party's right to the future enforcement of its rights under this 
Agreement, excepting only as to an expressed written and signed waiver as to 
a particular matter for a particular period of time.

     15.7     In conducting any activities under this Agreement or in 
connection with the manufacture use or sale of PRODUCT, BML shall comply with 
all applicable laws and regulations including, but not limited to, all Export 
Administration Regulations of the United States Department of Commerce.


                                     25.

<PAGE>

     15.8     NOTICES.  Any notices given pursuant to this Agreement shall be 
in writing and shall be deemed delivered upon the earlier of (i) when 
received at the address set forth below, or (ii) three (3) business days 
after mailed by certified or registered mail postage prepaid and properly 
addressed, with return receipt requested, or (iii) when sent, if sent, by 
facsimile, as confirmed by certified or registered mail.  Notices shall be 
delivered to the respective parties as indicated:

    If to CVT:          CV Therapeutics, Inc.
                        3172 Porter Drive
                        Palo Alto, CA 94304
                        Attn: CEO

                        with a copy to:     Cooley Godward LLP
                                            3000 El Camino Real
                                            Palo Alto, CA 94306
                                            Attn: Robert L. Jones, Esq.
                                            Deborah Marshall, Esq.

    If to BML:          Biotech Manufacturing Limited
                        St. Paul's Gate
                        New Street
                        St. Helier, Jersey JE48Z
                        Channel Islands
                        Attn: President

                        with a copy to:     Biogen, Inc.
                                            14 Cambridge Center
                                            Cambridge, MA 02142
                                            Attn: Vice President - General
                                            Counsel

     15.9     This Agreement may be executed in any number of separate 
counterparts, each of which shall be deemed to be an original, but which 
together shall constitute one and the same instrument.



                                     26.

<PAGE>

    IN WITNESS WHEREOF, the parties have executed this Agreement as of the 
date set forth above.

CV THERAPEUTICS, INC.                       BIOTECH MANUFACTURING LTD.

By: /s/ Louis Lange                         By: /s/ James H.M. Kirkness
   -------------------------------------       -------------------------------
Name: Louis Lange                           Name: James H.M. Kirkness
     -----------------------------------         -----------------------------
Title: CEO                                  Title: Director
      ----------------------------------          ----------------------------


                                     27.

<PAGE>





                                      APPENDIX A

                                    PATENT RIGHTS
                                           


<PAGE>


                                    U. S. PATENTS

<TABLE>
<CAPTION>

                   Docket No./                                                                    Issue Date/    Patent
Patent No.         Serial No.     Title                                     Inventor(s)           Date File      Expires
- ------------------------------------------------------------------------------------------------------------------------------
<S>                <C>            <C>                                       <C>                   <C>            <C>

[                                                                  *                                                         ]

</TABLE>

[  *  ]

- --------------------------
 * Confidential treatment requested.

                                     1

<PAGE>
                           U.S. PENDING PATENT APPLICATIONS
<TABLE>
<CAPTION>

Docket No./
Serial No.    Descriptive Title                         Inventor(s)         Date Filed     Status
- -------------------------------------------------------------------------------------------------------------
<S>           <C>                                       <C>                 <C>            <C>  

[                                                                  *                                                         ]

</TABLE>

[  *  ]

- --------------------------
 * Confidential treatment requested.

                                      2

<PAGE>

                      U.S. PENDING PATENT APPLICATIONS (CONT'D)

<TABLE>
<CAPTION>

Docket No./
Serial No.    Descriptive Title                         Inventor(s)         Date Filed     Status
- -------------------------------------------------------------------------------------------------------------
<S>           <C>                                       <C>                 <C>            <C>  

[                                                                  *                                                         ]

</TABLE>

[  *  ]

- --------------------------
 * Confidential treatment requested.

                                     3

<PAGE>

                      U.S. PENDING PATENT APPLICATIONS (CONT'D)

<TABLE>
<CAPTION>

Docket No./
Serial No.    Descriptive Title                         Inventor(s)         Date Filed     Status
- -------------------------------------------------------------------------------------------------------------
<S>           <C>                                       <C>                 <C>            <C>  

[                                                                  *                                                         ]

</TABLE>

[  *  ]

- --------------------------
 * Confidential treatment requested.

                                       4

<PAGE>



                      U.S. PENDING PATENT APPLICATIONS (CONT'D)

<TABLE>
<CAPTION>

Docket No./
Serial No.    Descriptive Title                         Inventor(s)         Date Filed     Status
- -------------------------------------------------------------------------------------------------------------
<S>           <C>                                       <C>                 <C>            <C>  

[                                                                  *                                                         ]

</TABLE>

[  *  ]

- --------------------------
 * Confidential treatment requested.

                                       5

<PAGE>


                             FOREIGN PATENT APPLICATIONS 

<TABLE>
<CAPTION>

Docket No./
Serial No.         Descriptive Title                                        Inventor(s)         Date Filed     Status
- ----------------------------------------------------------------------------------------------------------------------------------
<S>                <C>                                                      <C>                 <C>           <C>  

[                                                                  *                                                         ]

</TABLE>

[  *  ]

- --------------------------
 * Confidential treatment requested.

                                        6
<PAGE>

                         FOREIGN PATENT APPLICATIONS (CONT'D)

<TABLE>
<CAPTION>

Docket No./
Serial No.         Descriptive Title                                        Inventor(s)         Date Filed     Status
- ----------------------------------------------------------------------------------------------------------------------------------
<S>                <C>                                                      <C>                 <C>            <C>  

[                                                                  *                                                         ]

</TABLE>

- --------------------------
 * Confidential treatment requested.

                                      7

<PAGE>


                                      APPENDIX B

                                INTENTIONALLY OMITTED


<PAGE>


                                      APPENDIX C

                                INTENTIONALLY OMITTED


<PAGE>

                                      APPENDIX D

                                    PRESS RELEASE


<PAGE>


CONTACT

Kathy Stafford
Chief Financial Officer
CV Therapeutics
415-812-9507

Biogen Media Contact:
Kathryn R. Bloom
Director of Communications
Biogen, Inc.
617-679-2851

Biogen Investment Community Contact:
Richard E.N. Lundberg
Manager, Investor Relations
Biogen, Inc. 
6179-679-2822

             BIOGEN AND CV THERAPEUTICS ANNOUNCE COLLABORATION ON CVT-124
                             FOR CONGESTIVE HEART FAILURE

CAMBRIDGE, MA (March 10, 1997) -- Biogen, Inc. (NASDAQ/BGEN) and CV 
Therapeutics (NASDAQ/CVTX) today announced that they have signed an agreement 
to collaborate on the development of CVT-124, a novel therapeutic for the 
treatment of edema associated with Congestive Heart Failure (CHF) that is 
expected to enter a multi-center Phase II clinical trial within the next 
month.

Under the terms of the agreement, Biogen and its wholly owned subsidiary, 
Biotech Manufacturing Limited, will receive exclusive worldwide rights to 
develop and sell CVT-124.  Biogen and CV Therapeutics will participate in 
developing the drug, but Biogen will pay all costs of commercializing the 
product.  CV Therapeutics will receive from Biogen upfront payments totaling 
$16 million, including a $5 million upfront cash payment, a $7 million equity 
investment of CV Therapeutics stock at $10.45 per share, advance funding of a 
development milestone and partial access to a line of credit.  In addition, 
Biogen will pay CV Therapeutics significant milestone payments and royalties 
on clinical progress and product sales.  Further details of the agreement 
were not announced.

Congestive Heart Failure is a chronic, progressive disease that affects 
approximately four-to-five million people in the United States.  Its 
prevalence is increasing at 10 percent per year, primarily


<PAGE>

due to the aging population as well as improved survival in heart disease 
patients.  Patients with CHF experience both a chronic course of the disease, 
as well as acute episodes that, in many cases,  require hospitalization.  
Edema, or fluid retention in the lungs and extremities, is a significant 
symptom of the disease, leading to increased morbidity and need for 
hospitalization.  In its most severe form, CHF results in a 50 percent 
one-year mortality rate.

CVT-124, a highly selective adenosine A(1)-receptor antagonist, could 
represent a novel therapy for the treatment of edema associated with CHF.  
Proof of this new mechanism of action has been demonstrated both in animal 
models and in a clinical Phase I study completed in 1996.  This new approach 
could be a significant advance because current therapies can lead to clinical 
resistance and unwanted side effects, such as potassium loss and impairment 
of kidney function.  Because of some of its potential properties, CVT-124 may 
be particularly useful in CHF patients who are resistant to current therapies 
and/or have renal impairment.

Jim Tobin, Biogen's President and Chief Executive Officer, said, "Developing 
Biogen's pipeline is a major strategic imperative for the Company, and we are 
pleased to be collaborating with CV Therapeutics to help meet this objective. 
CVT-124 represents a very promising commercial opportunity to enter an 
underserved market with a late-stage therapeutic.  We believe CVT-124, with 
its novel mechanism of action, may have a major impact in the treatment and 
management of Congestive Heart Failure.  It is a very attractive fit with 
Biogen's strategy of developing therapeutics for large underserved markets, 
such as neurological, cardiovascular and renal diseases."

Lou Lange, Chairman and Chief Executive Officer of CV Therapeutics, said, "In 
Biogen, we believe we have found partner for CVT-124 who can bring the 
product to market quickly and with whom we can work closely on development of 
this promising compound.  Biogen's outstanding performance in commercializing 
AVONEX-TM- gives us confidence that they will maximize the potential of 
CVT-124."

In addition to historical information, this press release contains 
forward-looking statements that involve risks and uncertainties that could 
cause actual results to differ materially from those reflected in such 
forward-looking statements.  Reference is made in particular to 
forward-looking statements regarding the timing of clinical trials, the 
potential results of drug development and the commercial opportunity for 
CVT-124.  Drug development involves a high degree of risk.  There are many 
factors which could cause actual results to differ from the Company's current 
expectations, including the Company's ability to demonstrate that CVT-124 is 
safe and effective at each stage of the clinical trial process; to meet 
applicable regulatory standards and receive required regulatory approval; to 
obtain and maintain necessary patents and licenses; to be capable of 
producing the product in commercial quantities at reasonable costs and to 
compete successfully against other products.

Biogen, Inc., headquartered in Cambridge, MA, is a biopharmaceutical company 
principally engaged in discovering and developing drugs for human healthcare 
through genetic engineering.  The Company's revenues are generated from U.S. 
sales of AVONEX-TM- (Interferon beta-1a) for treatment of relapsing forms of 
multiple sclerosis and from the worldwide sales by licenses of a 


<PAGE>


number of products, including alpha interferon and hepatitis B vaccines and 
diagnostic products.  Biogen is focused primarily on developing and testing 
novel products for multiple sclerosis, inflammatory, respiratory and kidney 
diseases and certain viruses and cancers.  For copies of press releases and 
additional information about the Company, please consult Biogen's Homepage on 
the World Wide Web at http://www.biogen.com.

CV Therapeutics, headquartered in Palo Alto, CA, is a biopharmaceutical 
company focused exclusively on the application of molecular cardiology to the 
discovery, development and commercialization of novel, small molecule drugs 
for the treatment of cardiovascular diseases.

                                     #    #    #


030796
s.97draft.cvt


<PAGE>

                                      APPENDIX E

                                INTENTIONALLY OMITTED


<PAGE>

                                      APPENDIX F

                                INTENTIONALLY OMITTED


<PAGE>

                                                           Exhibit 10.42


                           COMMON STOCK PURCHASE AGREEMENT



                                       Between

                                CV THERAPEUTICS, INC.

                                         and

                              BIOTECH MANUFACTURING LTD.




                              Dated as of March 7, 1997


<PAGE>

Confidential treatment has been requested for portions of this document. 
Brackets indicate portions of text that have been omitted. A separate filing 
of such omitted text has been made with the Commission as part of the 
Company's application for confidential treatment.


                           COMMON STOCK PURCHASE AGREEMENT



    THIS COMMON STOCK PURCHASE AGREEMENT (this "Agreement"), dated as of this
7th day of March, 1997 (the "Effective Date"), between CV Therapeutics, Inc.
(the "Company") and Biotech Manufacturing Ltd., a wholly-owned subsidiary of
Biogen, Inc.(the "Purchaser").

    WHEREAS, the Purchaser desires to acquire and the Company is willing to
issue and sell to the Purchaser shares of Common Stock, $.001 par  value (the
"Common Stock"), of the Company, subject to the terms and conditions specified
herein.

    NOW, therefore, in consideration of the premises and the mutual covenants
contained in this Agreement, the parties agree as follows:


                                      ARTICLE I
                                           
                                     DEFINITIONS
                                           

    SECTION 1.01   DEFINITIONS.  As used in this Agreement, references to
either gender shall include the other gender, and the following terms shall have
the following meanings (such meanings to be equally applicable to both the
singular and plural forms of the terms defined):

         "Agreement" means this Common Stock Purchase Agreement, as amended, 
    modified or supplemented from time to time.

         "Biogen Agreement" means the Research Collaboration and License 
    Agreement between the Company and Biogen, Inc. of even date herewith, as 
    amended, modified or supplemented from time to time.


                                      2

<PAGE>

         "Business Day" means any day on which commercial banks are not 
    authorized or required by law to close in New York, New York.

         "BML Collaboration Agreement" means the Research Collaboration and 
    License Agreement between the Company and the Purchaser of even date 
    herewith, as amended, modified or supplemented from time to time.

         "Commission" means the United States Securities and Exchange 
    Commission, or any other agency successor thereto.

         "Common Stock" has the meaning specified in the recitals to this 
    Agreement.

         "Company" means and shall include CV Therapeutics, Inc., a Delaware 
    corporation, and its successors and permitted assigns.

         "Current Per Share Market Price" of the Common Stock on any date 
    shall mean the average of the daily closing prices per share of Common 
    Stock for the 20 consecutive Trading Days immediately prior to such date; 
    PROVIDED that in the event that the current per share market price of 
    Common Stock is determined during a period following the announcement by 
    the Company of (A) a dividend or distribution on the Common Stock payable 
    in shares of Common Stock or securities convertible into shares of Common 
    Stock or (B) any subdivision, combination or reclassification of the 
    Common Stock and prior to the expiration of 20 Trading Days after the 
    ex-dividend date for such dividend or distribution, or the record date 
    for such subdivision, combination or reclassification, then, and in each 
    such case, the Current Per Share Market Price shall be appropriately 
    adjusted to reflect ex-dividend trading or such subdivision, combination 
    or reclassification.  The closing price for each day shall be the last 
    reported sales price of the Common Stock as reported by the Nasdaq 
    National Market, or the primary national securities exchange on which the 
    Common Stock is then quoted; provided, however, that if the Common Stock 
    is neither traded on the Nasdaq National Market nor on a national 
    securities exchange, the price 



                                      3

<PAGE>

    referred to above shall be the price in the over-the-counter market as 
    reported by the National Association of Securities Dealers' Automated 
    Quotation System or, if not so reported, the price as reported by the 
    National Quotation Bureau, Inc., or any organization performing a 
    similar function.

         [  *  ] Closing" has the meaning specified in Section 3.01(a).

         [  *  ] Date" has the meaning specified in Section 3.01(a).

         [  *  ] Shares" has the meaning specified in Section 3.01(a).

         "Initial Closing" has the meaning specified in Section 2.01(b).

         "Initial Shares" has the meaning specified in Section 2.01(a).

         "Investor Rights Agreement" means the Amended and Restated Investor 
    Rights Agreement dated May 29, 1996, as amended, modified or supplemented 
    from time to time, by and among the Company and certain investors of the 
    Company (including the Purchaser).

         "Loan Agreement" means the Loan Agreement of even date herewith 
    between the Company and the Purchaser, as amended, modified or 
    supplemented from time to time.

         "Milestone Closing" has the meaning specified in Section 3.03(a).

         "Milestone Date" has the meaning specified in Section 3.03(a).

         "Milestone Shares" has the meaning specified in Section 3.03(a).

         "Person" means an individual, corporation, partnership, association, 
    joint venture, trust, or unincorporated 


- --------------------------
 * Confidential treatment requested.

                                      4

<PAGE>

    organization, or a government or any agency or political subdivision 
    thereof.

         "Purchaser" means and shall include Biotech Manufacturing Ltd., a 
    wholly-owned subsidiary of Biogen, Inc., and its successors and permitted 
    assigns.

         "Recapitalization Event" means any stock dividend, stock split, 
    combination, reorganization, recapitalization, reclassification, 
    consolidation, merger or similar event involving a change in the 
    Company's corporate structure.

         [  *  ] Closing" has the meaning specified in Section 3.02(a).

         [  *  ] Date" has the meaning specified in Section 3.02(a).

         [  *  ] Shares" has the meaning specified in Section 3.02(a).

         "Securities Act" means the Securities Act of 1933 or any similar 
    Federal statute, and the rules and regulations of the Commission 
    thereunder, all as the same shall be in effect at the time.

         "Shares" means (i) the Initial Shares, (ii) the [  *  ] Shares, 
    if issued pursuant to Section 3.01, (iii) the [  *  ] Shares, if 
    issued pursuant to Section 3.02, (iv) the Milestone Shares, if issued 
    pursuant to Section 3.03 and (v) any other shares of Common Stock 
    issued to the Purchaser in respect of the foregoing Shares because of any 
    Recapitalization Event.

         "Trading Day" means a day on which the principal national securities 
    exchange on which the Common Stock is listed or admitted to trading is 
    open for the transaction of business or, if the Common Stock is not 
    listed or admitted to trading on any national securities exchange, a 
    Business Day.


- --------------------------
 * Confidential treatment requested.

                                      5

<PAGE>

         "Transaction Documents" shall mean this Agreement and any other 
    instruments or certificates to be executed and delivered in connection 
    with this Agreement upon the Initial Closing.




                                      ARTICLE II

                       PURCHASE AND SALE OF THE INITIAL SHARES


    SECTION 2.01   PURCHASE AND SALE OF THE INITIAL SHARES.

         (a)  ISSUANCE OF THE INITIAL SHARES.  Subject to the terms and
conditions of this Agreement, at the Initial Closing (as defined below) the
Company agrees to issue and sell to the Purchaser and the Purchaser agrees to
purchase from the Company, at an aggregate purchase price of seven million
dollars ($7,000,000), such number of shares (rounded to the nearest whole share)
of Common Stock (the "Initial Shares") equal to 7,000,000 divided by the product
of 1.35 times the Current Per Share Market Price as of the date which is two
Business Days prior to the Initial Closing.  Notwithstanding the foregoing, in
no event shall the above calculation result in the Purchaser receiving less than
583,333 Initial Shares nor more than 736,842 Initial Shares in exchange for
payment of the aggregate purchase price as specified above.

         (b)  INITIAL CLOSING; DELIVERY OF THE INITIAL SHARES.  The purchase 
and sale of the Initial Shares shall take place at a closing (the "Initial 
Closing") to be held at the offices of Biogen, Inc., 14 Cambridge Center, 
Cambridge, MA 02142, at [___] A.M. (local time) on March 10, 1997, or at such 
other location, time and date as may be mutually agreed upon by the parties.  
At the Initial Closing, subject to the terms and conditions contained in this 
Agreement, the Company will provide evidence satisfactory to the Purchaser 
that the Company has taken all steps necessary to cause to be issued to the 
Purchaser a stock certificate evidencing the Initial Shares, registered in 
the name of the Purchaser and dated as of the date of the Initial Closing, 
which stock certificate shall be delivered to the Purchaser within two 
Business Days of the Initial Closing, against delivery 

                                      6

<PAGE>

of a certified or official bank check payable to the order of the Company in 
New York Clearing House or similar same day funds or against receipt of a 
wire transfer of immediately available funds to an account of the Company 
specified to the Purchaser, in an amount equal to seven million dollars 
($7,000,000), in payment of the full purchase price for the Initial Shares.


                                     ARTICLE III

                            PURCHASE OF ADDITIONAL SHARES

    SECTION 3.01  PURCHASE AND SALE OF [  *  ] SHARES.

         (a)  [  *  ] SHARES.  On the date which is the [  *  ] of the 
Effective Date or, if such date is not a Business Day, on the next Business 
Day (the "[  *  ] Date"), unless either the Company or Biogen, Inc. has 
delivered a notice of termination of the Research Program (as defined in the 
Biogen Agreement) prior to the [  *  ] Date, in accordance with the 
provisions of Section 8.5 of the Biogen Agreement, the Company shall become 
obligated to issue and sell to the Purchaser and the Purchaser shall become 
obligated to purchase from the Company, in each case subject to and in 
reliance upon the representations, warranties, terms and conditions of this 
Agreement, at an aggregate purchase price of [  *  ] such number of shares 
(rounded to the nearest whole share) of Common Stock (the "[  *  ] Shares") 
equal to [  *  ]  divided by the Current Per Share Market Price on the date 
which is two Business Days prior to the [  *  ] Date at a closing (the 
"[  *  ] Closing"). 

         (b)  [  *  ] CLOSING; DELIVERY OF [  *  ] SHARES. The purchase and 
sale of the [  *  ] Shares shall take place at the [  *  ] Closing, to be 
held at the principal offices of the Company, at 10:00 a.m. (local time) on 
the date determined pursuant to subsection (a) above, or at such other 
location, time, or date as may be mutually agreed upon. At the [  *  ] 
Closing, subject to the terms and conditions contained in this Agreement, the 
Company will issue a stock certificate evidencing the [  *  ] 


- --------------------------
 * Confidential treatment requested.

                                      7

<PAGE>

Shares, registered in the name of the Purchaser, against delivery of a 
certified or official bank check payable to the order of the Company in New 
York Clearing House or similar same day funds or against receipt of a wire 
transfer of immediately available funds to an account of the Company 
specified to the Purchaser, in the amount equal to [  *  ] in payment of the 
full purchase price for the [  *  ] Shares.

    SECTION 3.02  PURCHASE AND SALE OF [  *  ] SHARES.

         (a)  [  *  ] SHARES.  On the date which is the [  *  ] of the 
Effective Date or, if such date is not a Business Day, on the next Business 
Day (the "[  *  ] Date"), unless either the Company or Biogen, Inc. has 
delivered a notice of termination of the Research Program (as defined in the 
Biogen Agreement) prior to the [  *  ] Date, in accordance with the 
provisions of Section 8.5 of the Biogen Agreement, the Company shall become 
obligated to issue and sell to the Purchaser and the Purchaser shall become 
obligated to purchase from the Company, in each case subject to and in 
reliance upon the representations, warranties, terms and conditions of this 
Agreement, at an aggregate purchase price of [  *  ] such number of shares 
(rounded to the nearest whole share) of Common Stock (the "[  *  ] Shares") 
equal to [  *  ] divided by the Current Per Share Market Price on the date 
which is two Business Days prior to the [  *  ] Date at a closing (the 
"[  *  ] Closing"). 

         (b)  [  *  ] CLOSING; DELIVERY OF [  *  ] SHARES.  The purchase and 
sale of the [  *  ] Shares shall take place at the [  *  ] Closing, to be 
held at the principal offices of the Company, at 10:00 a.m. (local time) on 
the date determined pursuant to subsection (a) above, or at such other 
location, time, or date as may be mutually agreed upon.  At the [  *  ] 
Closing, subject to the terms and conditions contained in this Agreement, the 
Company will issue a stock certificate evidencing the [  *  ] Shares, 
registered in the name of the Purchaser, against delivery of a certified or 
official bank check payable to


- --------------------------
 * Confidential treatment requested.

                                      8

<PAGE>

the order of the Company in New York Clearing House or similar same day funds 
or against receipt of a wire transfer of immediately available funds to an 
account of the Company specified to the Purchaser, in the amount equal to 
[  *  ] in payment of the full purchase price for the [  *  ] Shares.

    SECTION 3.03   PURCHASE AND SALE OF MILESTONE SHARES

         (a)  MILESTONE SHARES.  Fifteen days after the date on which the 
Purchaser gives notice to the Company of its decision to commence a Phase III 
clinical study of a PRODUCT [  *  ], or otherwise becomes obligated to 
purchase equity in the Company in connection with such milestone, as defined 
and provided for in the BML Collaboration Agreement, or, if such date is not 
a Business Day, on the next Business Day (the "Milestone Date"), the Company 
shall become obligated to issue and sell to the Purchaser and the Purchaser 
shall become obligated to purchase from the Company, in each case subject to 
and in reliance upon the representations, warranties, terms and conditions of 
this Agreement, at an aggregate purchase price of [  *  ] such number of 
shares (rounded to the nearest whole share) of Common Stock (the "Milestone 
Shares") equal to [  *  ] divided by the Current Per Share Market Price on 
the date which is two Business Days prior to the Milestone Date at a closing 
(the "Milestone Closing"). 

         (b)  MILESTONE CLOSING; DELIVERY OF MILESTONE SHARES.  The purchase 
and sale of the Milestone Shares shall take place at the Milestone Closing, 
to be held at the principal offices of the Company, at 10:00 a.m. (local 
time) on the date determined pursuant to subsection (a) above, or at such 
other location, time, or date as may be mutually agreed upon.  At the 
Milestone Closing, subject to the terms and conditions contained in this 
Agreement, the Company will issue a stock certificate evidencing the 
Milestone Shares, registered in the name of the Purchaser, against delivery 
of a certified or official bank check payable to the order of the Company in 
New York Clearing House or similar same day funds or against receipt of a 
wire transfer of immediately available funds to an account of the Company 
specified to the Purchaser, in the amount equal to [  *  ] 


- --------------------------
 * Confidential treatment requested.

                                      9

<PAGE>

in payment of the full purchase price for the Milestone Shares.

    SECTION 3.04   LIMIT ON SHARE OWNERSHIP.  Notwithstanding any provision of
this Agreement to the contrary, Purchaser shall in no event be required to
purchase shares of Common Stock if, after giving effect to such purchase, the
sum of (i) the number of shares of Common Stock purchased hereunder and (ii) the
number of shares of Common Stock of the Company tendered to the Purchaser in
connection with the Loan Agreement would exceed 19.9% of the amount of the then
outstanding shares of Common Stock.  Notwithstanding the foregoing, in order to
insure for the Company the benefits of the transactions contemplated in this
Agreement and the Loan Agreement, and the covenants set forth in Section 7.01
hereof, to the extent that Purchaser has acquired Voting Securities in
transactions other than those described in Article III hereof and the Loan
Agreement ("Other Voting Securities") the Purchaser shall sell such Other Voting
Securities to the extent necessary to permit the transactions contemplated
herein or in the Loan Agreement to be consummated without violation of the
provisions of this Section 3.04 and Section 7.01 hereof.

    SECTION 3.05   CERTAIN TRADING RESTRICTIONS.  Purchaser will not, nor will
it permit any of its Affiliates (as such term is used in Rule 12b-2 of the
Securities Exchange Act of 1934 (the "Exchange Act"), such term to have such
definition as used throughout this Agreement) to, during the 30 consecutive
Trading Days prior to the date of any determination of Current Per Share Market
Price hereunder, (a) acquire any Voting Securities (as defined in Section 7.01),
(b) offer, pledge, sell, contract to sell, sell any option or contract to
purchase, purchase any option or contract to sell, grant any option, right or
warrant to purchase, or otherwise transfer or dispose of, directly or
indirectly, any Voting Securities or (c) enter into any swap or similar
agreement that transfers, in whole or in part, the economic risk of ownership of
Voting Securities, whether any such transaction described in clause (a), (b) or
(c) above is to be settled by delivery of Voting Securities or such other
securities, in cash or otherwise.

    SECTION 3.06   COMPLIANCE WITH NASDAQ STOCK MARKET RULE


- --------------------------
 * Confidential treatment requested.

                                      10

<PAGE>

4460(i)(1)(D). Notwithstanding any provision of this Agreement to the 
contrary, except as otherwise permitted by the rules of the NASDAQ Stock 
Market, the Company shall in no event be obligated to issue and sell, and the 
Purchaser shall in no event be obligated to purchase, shares of Common Stock 
pursuant to Article III hereof or the Loan Agreement, to the extent that such 
issuance and sale would result in the number of shares of Common Stock 
purchased hereunder and tendered in connection with the Loan Agreement 
constituting (i) the sale or issuance of 20% or more of the Common Stock or 
(ii) the sale or issuance of securities constituting 20% or more of voting 
power, for less than the greater of book or market value.

                                      ARTICLE IV

                                CONDITIONS TO CLOSINGS

    SECTION 4.01   MUTUAL CONDITIONS TO CLOSINGS.  The obligation of the 
Purchaser to purchase and pay for, and the obligation of the Company to issue 
and sell to the Purchaser, the Initial Shares at the Initial Closing, the 
[  *  ] Shares at the [  *  ] Closing, the [  *  ] Shares at the [  *  ] 
Closing, and the Milestone Shares at the Milestone Closing, in each case is 
subject to the following conditions:

         (i)  NO INJUNCTION.  No injunction or order of any court or other
governmental authority restraining the consummation of the transactions provided
for herein or contemplated by the other Transaction Documents shall be in
effect; and

         (ii) NO TERMINATION.  This Agreement shall not have been terminated
pursuant to Section 8.03, and neither the BML Collaboration Agreement nor the
Biogen Agreement shall have been terminated.

    SECTION 4.02   CONDITIONS TO PURCHASER'S OBLIGATIONS.  The obligation of 
the Purchaser to purchase and pay for the Initial Shares at the Initial 
Closing, the [  *  ] Shares at the [  *  ] Closing, the [  *  ] Shares at 


- --------------------------
 * Confidential treatment requested.

                                      11

<PAGE>

the [  *  ] Closing and the Milestone Shares at the Milestone Closing, in 
each case is subject to the following additional conditions:

         (i)  REPRESENTATIONS AND WARRANTIES.  Each of the representations 
    and warranties of the Company set forth in Article V hereof shall be true 
    and correct in all material respects on the date of such closing;

         (ii) EXECUTED COUNTERPARTS.  The Purchaser shall have received prior 
    to or at the Initial Closing counterparts of each of the Transaction 
    Documents, the Biogen Agreement, the BML Collaboration Agreement and the 
    Loan Agreement, each in form and substance reasonably satisfactory to the 
    Purchaser, duly executed by the Company;

         (iii)     DELIVERY OF STOCK CERTIFICATES.  The Company shall have 
    delivered to the Purchaser (i) at the Initial Closing, evidence 
    satisfactory to the Purchaser that the Company has taken all steps 
    necessary to cause to be issued to the Purchaser a stock certificate 
    evidencing the Initial Shares, as specified in Section 2.01(b), and (ii) 
    at the other closings contemplated hereunder, a stock certificate 
    evidencing the [  *  ] Shares, the [  *  ] Shares or the Milestone 
    Shares (as the case may be), registered in the name of the Purchaser;

         (iv) OPINION OF COUNSEL.  The Purchaser shall have received prior to 
    or at the Initial Closing an opinion from counsel to the Company in 
    substantially the form attached hereto as Exhibit A;

         (v)  DOCUMENTATION AT INITIAL CLOSING.  The Purchaser shall have 
    received, prior to or at the Initial Closing, a certificate, executed by 
    the Secretary of the Company and dated as of the date of the Initial 
    Closing, together with and certifying as to (A) the resolutions of the 
    Board of Directors of the Company authorizing the execution and delivery 
    of this Agreement, the Biogen Agreement, the BML Collaboration Agreement, 
    the Loan Agreement and the other Transaction Documents and the 
    performance by the Company of all transactions contemplated 


- --------------------------
 * Confidential treatment requested.

                                     12
<PAGE>

    hereby and thereby; (B) a copy of the Certificate of Incorporation of the 
    Company, as amended and in effect as of the date of the Initial Closing; 
    (C) a copy of the by-laws of the Company, as amended and in effect as of 
    the date of the Initial Closing; and (D) the names of the officers of the 
    Company authorized to sign the Transaction Documents together with the 
    true signatures of such officers;

         (vi) DOCUMENTS AND PROCEEDINGS. All documents to be provided to the 
    Purchaser hereunder, and all corporate and other proceedings taken or 
    required to be taken in connection with the transactions contemplated 
    hereby and to be consummated at or prior to the Initial Closing, the 
    [  *  ] Closing and the [  *  ] Closing and the Milestone Closing (as 
    the case may be) and all documents incident thereto, shall be 
    satisfactory in form and substance to the Purchaser or its counsel; and

         (vii)     WAIVER.  Any condition specified in this Section 4.02 may 
    be waived by the Purchaser.

    SECTION 4.03   CONDITIONS TO COMPANY'S OBLIGATIONS.  The obligation of 
the Company to issue and sell the Initial Shares at the Initial Closing, the 
[  *  ] Shares at the [  *  ] Closing, the [  *  ] Shares at the [  *  ] 
Closing and the Milestone Shares at the Milestone Closing, in each case is 
subject to the following additional conditions:

         (i)  REPRESENTATIONS AND WARRANTIES.  Each of the representations 
    and warranties of the Purchaser set forth in Article V hereof shall be 
    true and correct in all material respects on the date of such closing;

         (ii) EXECUTED COUNTERPARTS.  The Company shall have received prior 
    to or at the Initial Closing counterparts of each of the Transaction 
    Documents, the Biogen Agreement, the BML Collaboration Agreement and the 
    Loan Agreement, each in form and substance reasonably satisfactory to the 
    Company, duly executed by the Purchaser (or Biogen, Inc., as the case may 
    be);


- --------------------------
 * Confidential treatment requested.

                                     13

<PAGE>

         (iii) PAYMENT.  The Company shall have received payment in full 
    for the Initial Shares, the [  *  ] Shares, the [  *  ] Shares or the 
    Milestone Shares (as the case may be), in accordance with Section 
    2.01, 3.01, 3.02 or 3.03, as applicable; 

         (iv)  DOCUMENTATION AT INITIAL CLOSING.  The Company shall have 
    received, prior to or at the Initial Closing, a certificate, executed by 
    the Secretary or an Assistant Secretary of Biogen, Inc. and dated as of 
    the date of the Initial Closing, together with and certifying as to (A) 
    the resolutions of the Board of Directors of Biogen, Inc. authorizing the 
    execution and delivery of this Agreement, the Biogen Agreement, the BML 
    Collaboration Agreement, the Loan Agreement and the other Transaction 
    Documents and the performance by Biogen, Inc. or the Purchaser of all 
    transactions contemplated hereby and thereby; and (B) the names of the 
    officers of each of Biogen, Inc. and the Purchaser authorized to sign the 
    Transaction Documents together with the true signatures of such officers;

         (v)  DOCUMENTS AND PROCEEDINGS.  All documents to be provided to the 
    Company hereunder, and all corporate and other proceedings taken or 
    required to be taken in connection with the transactions contemplated 
    hereby and to be consummated at or prior to the Initial Closing, the 
    [  *  ] Closing, the [  *  ] Closing and the Milestone Closing (as 
    the case may be) and all documents incident thereto, shall be 
    satisfactory in form and substance to the Company or its counsel; and

         (vi) WAIVER.   Any condition specified in this Section 4.03 may be 
    waived by the Company.


- --------------------------
 * Confidential treatment requested.

                                         14

<PAGE>

                                      ARTICLE V

                            REPRESENTATIONS AND WARRANTIES

    SECTION 5.01   REPRESENTATIONS AND WARRANTIES OF THE COMPANY.  The Company
represents and warrants to the Purchaser as follows:

         (a)  ORGANIZATION AND STANDING OF THE COMPANY.  The Company is a duly
organized and validly existing corporation in good standing under the laws of
the State of Delaware and has all requisite corporate power and authority to own
and operate its assets and properties and to conduct its business as presently
conducted, except where the failure to do so would not have a material adverse
effect on the Company and its subsidiaries taken as a whole.

         (b)  CORPORATE ACTION.  The Company has all necessary corporate 
power and has taken all corporate action required to authorize its execution 
and delivery of, and its performance under, the Transaction Documents and the 
Company has all necessary corporate power and has taken all corporate action 
required to authorize the issuance and sale of the Initial Shares, the [  *  ]
Shares, the [  *  ] Shares and the Milestone Shares and to consummate the 
other transactions contemplated by the Transaction Documents.

         (c)  GOVERNMENTAL APPROVALS.  No authorization, consent, approval, 
license, exemption of or filing or registration with any court or 
governmental department, commission, board, bureau, agency or 
instrumentality, domestic or foreign, is necessary for, or in connection 
with, the issuance and sale of (w) the Initial Shares on the date of the 
Initial Closing, (x) the [  *  ] Shares on the date of the [  *  ] Closing, 
(y) the [  *  ] Shares on the date of the [  *  ] Closing, or (z) the 
Milestone Shares on the date of the Milestone Closing, or the execution and 
delivery by the Company of, or for the performance by it of its obligations 
under, the Transaction Documents.


- --------------------------
 * Confidential treatment requested.

                                     15

<PAGE>

         (d)  CAPITALIZATION.  As of the date hereof, the authorized capital 
stock of the Company is 30,000,000 shares of Common Stock, $.001 par value, 
of which 6,211,817 shares are issued and outstanding as of the date hereof 
and of which 23,039 shares are treasury shares as of the date hereof.  The 
Initial Shares, when issued against payment of the aggregate purchase price 
set forth in Section 2.01, the [  *  ] Shares, if and when issued against 
payment of the aggregate purchase price set forth in Section 3.01, the [  *  ]
Shares, if and when issued against payment of the aggregate purchase price 
set forth in Section 3.02, and the Milestone Shares, if and when issued 
against payment of the aggregate purchase price set forth in Section 3.03, 
will be duly authorized, validly issued and fully paid and non-assessable and 
not subject to any lien, claims or encumbrances by reason of the Company's 
charter or bylaws or by reason of any other consensual action taken by the 
Company.  As of the date hereof, except as described or contemplated in the 
IPO Registration Statement (as defined in Section 5.01(j)) and the SEC 
Reports (as defined in Section 5.01(k)), there are no options, warrants, 
convertible securities or other rights to purchase shares of capital stock or 
other securities of the Company which are authorized, issued or outstanding, 
nor is the Company obligated in any other manner to issue shares of its 
capital stock or other securities, and the Company has no obligation to 
purchase, redeem or otherwise acquire any shares of its capital stock or any 
interest therein or to pay any dividend or make any other distribution in 
respect thereof, except as contemplated by the Transaction Documents.  Except 
as described in the IPO Registration Statement and the SEC Reports, and 
except as otherwise contemplated by the Transaction Documents, (i) no person 
is entitled to any preemptive right, catch-up right, right of first refusal 
or similar right with respect to the issuance of any capital stock of the 
Company, (ii) there are no restrictions on the transfer of shares of capital 
stock of the Company other than those imposed by relevant federal and state 
securities laws and (iii) there exists no agreement between the Company's 
stockholders and to which the Company is party with respect to the voting or 
transfer of the Company's capital stock or with respect to any other aspect 
of the Company's affairs.

         (e)  REGISTRATION RIGHTS.  As of the Initial Closing Date, no person
has demand or other rights to cause the Company 


- --------------------------
 * Confidential treatment requested.

                                     16

<PAGE>

to file any registration statement under the Securities Act relating to any 
securities of the Company or any right to participate in any such 
registration statement except as set forth in the Investor Rights Agreement.

         (f)  ENFORCEABILITY.  The Company has duly authorized, executed and 
delivered the Transaction Documents, and the Transaction Documents constitute 
the legal, valid and binding obligations of the Company, enforceable in 
accordance with their respective terms, except as enforcement may be limited 
by applicable bankruptcy, insolvency, reorganization, moratorium or other 
similar laws affecting creditors' rights generally and to general principles 
of equity and limitations on availability of equitable relief, including 
specific performance, and except as rights to indemnification therein may be 
limited by applicable laws.

         (g)  ABSENCE OF CONFLICTS.  The Company's execution, delivery and 
performance of its obligations under this Agreement do not and will not (i) 
contravene its Amended and restated Certificate of Incorporation or Restated 
By-laws (ii) violate any law, rule, regulation, order, judgment or decree 
applicable to or binding upon the Company or its properties, which violation 
would have a material adverse effect on the Company and its subsidiaries 
taken as a whole, (iii) constitute a breach or default or require any consent 
under any agreement or instrument to which the Company is a party or by which 
the Company or its properties is bound or affected, which breach or default, 
or the absence of such consent, would have a material adverse effect on the 
Company and its subsidiaries taken as a whole, or (iv)  require any consent, 
permit, approval, action, filing or recording.

         (h)  FINANCIAL STATEMENTS.  The Company has previously furnished to 
the Purchaser a copy of the unaudited balance sheet of the Company at 
December 31, 1996 and any subsequent complete fiscal year and the related 
income statement for the year then ended (collectively, the "Financial 
Statements"). The Financial Statements are correct in all material respects, 
present fairly the financial condition and results of operations of the 
Company, as of the dates and for the periods indicated, and have been 
prepared in accordance with generally accepted accounting 


                                     17

<PAGE>

principles consistently applied, subject to the absence of notes and normal 
year end adjustments.

         (i)  ABSENCE OF MATERIAL ADVERSE CHANGE.  Since the date of the 
Financial Statements, there has been no change in the assets, liabilities or 
financial condition of the Company which, when taken together with all other 
changes in the assets, liabilities or financial condition of the Company, has 
had a material adverse effect on the business, prospects, financial 
condition, operations, property or affairs of the Company.

         (j)  FULL DISCLOSURE.  The Company has furnished or made available 
to Purchaser the following documents, and the Company warrants that the 
information contained in such documents, as of their respective dates (or if 
amended, as of the date of such amendment), did not contain any untrue 
statement of a material fact, and did not omit to state any material fact 
necessary to make any statement, in light of the circumstances under which 
such statement was made, not misleading:

         (i)   The Company's Registration Statement No. 333-12675 declared
    effective by the Securities Exchange Commission on November 19, 1996 and
    Prospectus dated November 19, 1996 (the "IPO Registration Statement"); and

         (ii)  All other documents subsequently filed by the Company with the
    SEC pursuant to the reporting requirements of the 1934 Act.

    (k)  SEC REPORTS.

               (i)  The Company has filed with the Commission all reports 
    ("SEC Reports") required to be filed by it under the Securities Exchange 
    Act of 1934, as amended (the "Exchange Act").  All of the SEC Reports 
    filed by the Company comply in all material respects with the 
    requirements of the Exchange Act.  All financial statements contained in 
    the SEC Reports have been prepared in accordance with generally accepted 
    accounting principles consistently applied throughout the period 
    indicated ("GAAP").  Each balance sheet presents fairly in accordance 
    with GAAP the financial position of the Company as of the date of such 
    balance 


                                    18

<PAGE>

    sheet, and each statement of operations, of stockholders' equity and of 
    cash flows presents fairly in accordance with GAAP the results of 
    operations, the stockholders' equity and the cash flows of the Company 
    for the periods then ended.

              (ii)  The SEC Reports, as of their respective dates (or if 
    amended, as of the date of such amendment), and this Agreement taken 
    together as a whole will not, on the date of the Initial Closing or the 
    date of any subsequent closing pursuant to Article III, as the case may 
    be, contain any untrue statement of a material fact or omit to state any 
    material fact required to be state therein, or necessary to make the 
    statements contained therein, in light of the circumstances under which 
    they were made, not misleading.

         (l)  SECURITIES LAWS.  Assuming the accuracy of the representations
and warranties of the Purchaser contained in Section 5.02 hereof, the issuance
of the Shares is exempt from the provisions of the Securities Act.  All notices,
filings, registrations, or qualifications under state securities or "blue-sky"
laws which are required in connection with the offer, issue and delivery of the
Shares pursuant to this Agreement, if any, have been or will be completed by the
Company.

         (m)  CLOSING DATE.  The representations and warranties of the Company
contained in this Section 5.01 and elsewhere in this Agreement will be true and
correct in all material respects on the date of the Initial Closing or the date
of any subsequent closing pursuant to Article III, as the case may be, as though
then made, except as affected by the transactions expressly contemplated by this
Agreement.

    SECTION 5.02   REPRESENTATIONS AND WARRANTIES OF THE PURCHASER. The
Purchaser represents and warrants to the Company as follows:

         (a)  ORGANIZATION AND STANDING. The Purchaser is a duly organized and
validly existing corporation in good standing and has all requisite corporate
power and authority to own and operate its assets and properties and to conduct
its business as presently conducted, except where the failure to do so would not


                                     19

<PAGE>

have a material adverse effect on the Purchaser and its subsidiaries taken as 
a whole.

         (b)  CORPORATE ACTION. The Purchaser has all necessary corporate 
power and has taken all corporate action required to authorize its execution 
and delivery of, and its performance under, the Transaction Documents to 
which it is a party and has all necessary corporate power and has taken all 
corporate action required to authorize its purchase of the Initial Shares, 
the [  *  ] Shares, the [  *  ] Shares and the Milestone Shares and to 
consummate the other transactions contemplated by the Transaction Documents.

         (c)  INVESTMENT INTENT.  The Purchaser is acquiring (w) the Initial 
Shares on the date of the Initial Closing, (x) the [  *  ] Shares on the date 
of the [  *  ] Closing, (y) the [  *  ] Shares on the date of the [  *  ] 
Closing and (z) the Milestone Shares on the date of the Milestone Closing for 
its own account for the purpose of investment and not with a view to, or for 
sale in connection with, the distribution thereof, and that it has no present 
intention of distributing or selling such Shares.  The Purchaser understands 
that such Shares have not been registered under the Securities Act, or the 
securities laws of any state or other jurisdiction, and hereby agrees not to 
make any sale, transfer or other disposition of such Shares unless either (i) 
such Shares have been registered under the Securities Act and all applicable 
state and other securities laws and any such registration remains in effect 
or (ii) the Company shall have received an opinion of counsel in form and 
substance satisfactory to the Company that registration is not required under 
the Securities Act or under applicable securities laws.

         (d)  OPPORTUNITY TO INVESTIGATE.  The Purchaser (i) has had the
opportunity to ask questions concerning the Company and all such questions posed
have been answered to its satisfaction; (ii) has been given the opportunity to
obtain any additional information it deems necessary to verify the accuracy of
any information obtained concerning the Company; and (iii) has such knowledge
and experience in financial and business matters that it is able to evaluate the
merits and risks of purchasing the 


- --------------------------
 * Confidential treatment requested.

                                     20

<PAGE>

Shares and to make an informed investment decision relating thereto.

         (e)  ACCREDITED INVESTOR.  The Purchaser is an "accredited investor"
as such term is defined in Regulation D under the Securities Act.

         (f)  ENFORCEABILITY. The Purchaser has duly authorized, executed and
delivered the Transaction Documents to which it is a party, and such Transaction
Documents constitute the legal, valid and binding obligations of the Purchaser,
enforceable in accordance with their respective terms, except as enforcement may
be limited by applicable bankruptcy, insolvency, reorganization, moratorium or
other similar laws affecting creditors' rights generally and to general
principles of equity and limitations on availability of equitable relief,
including specific performance, and except as rights to indemnification therein
may be limited by applicable laws.

         (g)  CLOSING DATE.  The representations and warranties of the
Purchaser contained in this Section 5.02 and elsewhere in this Agreement, and
all information contained in any writing delivered by, or on behalf of, the
Purchaser to the Company, will be true and correct in all material respects on
the date of the Initial Closing or the date of any subsequent closing pursuant
to Article III, as the case may be, as though then made, except as affected by
the transactions expressly contemplated by this Agreement.


                                      ARTICLE VI

                                      COVENANTS

    SECTION 6.01.  PERFORMANCE.  Each party shall perform all of its 
obligations hereunder and shall, at or prior to the Initial Closing, execute 
and deliver the other Transaction Documents, the Biogen Agreement and the BML 
Collaboration Agreement to which it is contemplated to be a signatory.

    SECTION 6.02.  COOPERATION.  Each party shall endeavor in good faith to
perform and fulfill all conditions and obligations 


                                     21

<PAGE>

on their respective parts to be fulfilled or performed hereunder or under the 
other Transaction Documents, to the end that the transactions contemplated 
hereby and thereby will be fully and timely consummated.

    SECTION 6.03.  REGISTRATION RIGHTS.  The Company shall, as promptly as
practicable, and in any event not later than ten (10)business days after the
Initial Closing Date, cause an amendment to the Investor Rights Agreement to be
executed, pursuant to which, in each case effective as of the date of the
Initial Closing (the "Amendment"):

         (a)  the Purchaser shall be made a party to the Investor Rights
    Agreement and included in the definition of "Investors" for all purposes of
    the Investor Rights Agreement;

         (b)  all shares of Common Stock issued or issuable to the Purchaser
    hereunder are included in the definition of "Registrable Securities" in
    Section 2.6 of the Investor Rights Agreement for all purposes of the
    Investor Rights Agreement; and

         (c)  the address for the Purchaser to be used for notices and
    communications under the Investor Rights Agreement will be:  BIOGEN, INC.,
    14 Cambridge Center, Cambridge, Massachusetts 02142, Attention: President,
    with a copy to BIOGEN, INC., 14 Cambridge Center, Cambridge, Massachusetts
    02142, Attention: Vice President and General Counsel.  

    In the event that the Amendment is not executed within such period, the
Company will enter into a Registration Rights Agreement with the Purchaser, in
form and substance satisfactory to the Purchaser, granting the Purchaser
registration rights with respect to all shares of Common Stock issued or
issuable to the Purchaser hereunder equivalent to the registration rights the
Purchaser would have had as an Investor under the Investor Rights Agreement.

    SECTION 6.04.  BROKER'S FEE.  Each of the Company and the Purchaser hereby
represents and covenants that except for amounts 


                                     22

<PAGE>

to be paid to Medical Portfolio Management by Purchaser, there are no brokers 
or finders entitled to compensation in connection with the sale of the Stock, 
and shall indemnify each other for any such fees for which they are 
responsible.

                                  ARTICLE VII


                          LIMITATIONS AND RESTRICTIONS
                                           
    SECTION 7.01.  RESTRICTIONS ON CERTAIN ACTIONS BY PURCHASER.

    (a)  The Purchaser agrees that, during the period commencing on the date
hereof and ending on the date which is the third anniversary of the date on
which the BML Collaboration Agreement ceases to be in full force and effect, the
Purchaser will not, nor will it permit any of its Affiliates to, acquire or
offer or propose to acquire any shares of Common Stock or any securities
convertible into, exchangeable for or exercisable for Common Stock (all such
securities, collectively, "Voting Securities") which, when taken together with
any Voting Securities then owned by the Purchaser and its Affiliates, would, in
the aggregate, exceed an amount equal to fifteen percent (15%) of the Company's
then outstanding Voting Securities, unless in any such case specifically invited
to do so by the Board of Directors of the Company; PROVIDED that this provision
shall not prevent the Purchaser or its Affiliates (i) from acquiring Voting
Securities as a result of the provisions of Article III of this Agreement or
(ii) from acquiring any Voting Securities as a result of the repayment, in whole
or in part, of the Loan Agreement with any Voting Securities.   Notwithstanding
any provision of this Agreement to the contrary, Purchaser shall in no event be
required to purchase shares of Common Stock if, after giving effect to such
purchase, the sum of (i) the number of shares of Common Stock purchased
hereunder and (ii) the number of shares of Common Stock of the Company tendered
to the Purchaser in connection with the Loan Agreement would exceed 19.9% of the
amount of the then outstanding shares of Common Stock.  Notwithstanding the
foregoing, in order to insure for the Company the benefits of the transactions
contemplated in this Agreement and the Loan Agreement, and the covenants set
forth in this Section 7.01, to the extent that Purchaser has acquired Voting


                                     23

<PAGE>

Securities in transactions other than those described in Article III hereof and
the Loan Agreement ("Other Voting Securities") the Purchaser shall sell such
Other Voting Securities to the extent necessary to permit the transactions
contemplated herein or in the Loan Agreement to be consummated without violation
of the provisions of Section 3.04 and this Section 7.01.

    (b)  The Purchaser acknowledges and agrees that irreparable damage would
occur in the event that any of the provisions of this Section 7.01 were not
performed in accordance with their specific terms or were otherwise breached. 
It is accordingly agreed that the parties shall be entitled to an injunction or
injunctions to prevent breaches of the provisions of this Section 7.01 and to
enforce specifically the terms and provisions hereof in any court of the United
States or any state thereof having jurisdiction, in addition to any other remedy
to which they may be entitled at law or equity.

    SECTION 7.02.  RESTRICTIONS ON SALES BY PURCHASER.  Purchaser agrees that
until the second anniversary of any Closing hereunder, it will not, nor will it
permit any of its Affiliates to sell, solicit an offer to sell or propose to
sell (collectively "Sell"), any Shares purchased at such Closing except as
follows:

    (a)  Purchaser may transfer Shares to any of its Affiliates;

    (b)  Purchaser shall be permitted to sell or otherwise dispose of such
minimum number of as is required to reduce Purchaser's ownership to (1) 19.99%
of the Company's outstanding Common Stock or (2) in the event that Purchaser is
required to consolidate or include the Company's profits and losses in its
profit and loss statements (and the aggregate amount of losses to be
consolidated may reasonably exceed $50,000), such lesser amount of the Company's
outstanding Common Stock as may be required in the written opinion of
Purchaser's independent public accountants in order to avoid such consolidation
or inclusion;

    (c)  Purchaser may sell its Shares pursuant to a tender offer or exchange
offer for all outstanding shares of the Company's Common Stock approved by the
Company's Board of Directors; and


                                     24

<PAGE>

    (d)  Without duplication of any of the Shares permitted to be sold 
pursuant to any of the other provisions of this Section 7.02, Purchaser may 
sell all or any part of the Shares owned by Purchaser or its Affiliates 
pursuant to the registration rights provisions contained in the Loan 
Agreement (or any document relating thereto) or in the Investor Rights 
Agreement, as amended (or such other registration rights agreement as may be 
entered into between the parties pursuant to the provisions of Section 6.03 
hereof); provided, however, that, with respect to any registration statement 
or statements relating to a non-underwritten offering filed pursuant to such 
agreements, Purchaser shall not (i) seek to register on such registration 
statement or statements, in any period of 12 consecutive months, shares of 
Common Stock in an amount in excess of 10% of the amount of then outstanding 
Common Stock at the commencement of such 12 month period or (ii) sell in any 
period of three consecutive months shares of Common Stock in an amount in 
excess of 2.5% of the amount of then outstanding Common Stock at the 
commencement of such three month period.

                                     ARTICLE VIII

                                    MISCELLANEOUS

    SECTION 8.01.  NOTICES.  All notices, requests, consents and other
communications hereunder shall be in writing, shall be addressed to the
receiving party's address set forth below or to such other address as a party
may designate by notice hereunder, and shall be either (i) delivered by hand,
(ii) made by telecopy or facsimile transmission (receipt confirmed), (iii) sent
by international overnight or express courier, or (iv) sent by registered mail,
return receipt requested, postage prepaid.

If to the Company:      CV Therapeutics, Inc.
                        3172 Porter Drive
                        Palo Alto, CA 94304
                        Attn:  Chief Executive Officer 
                        FAX:  

with a copy to:         Cooley Godward LLP
                        Five Palo Alto Square


                                     25

<PAGE>

                        3000 El Camino Real
                        Palo Alto, CA 94306-2155
                        Attn: Deborah A. Marshall, Esq.
                        FAX: 415-857-0663


If to the Purchaser:    Biogen Manufacturing, Ltd.
                        St. Paul's Gate
                        New Street
                        St. Helier, Jersey  JE48Z
                        Channel Islands
                        Attn: Director
                        FAX:  011-44-153-488-9871

with a copy to:         Biogen, Inc.
                        14 Cambridge Center
                        Cambridge, MA 02142
                        Attn: Vice President and General Counsel
                        FAX:  617-679-2838

    All notices, requests, consents and other communications hereunder shall be
deemed to have been given either (i) if by hand, at the time of the delivery
thereof to the receiving party at the address of such party set forth above,
(ii) if made by telecopy or facsimile transmission, at the time that receipt
thereof has been acknowledged by electronic confirmation or otherwise, (iii) if
sent by overnight or express courier, on the Business Day following the day such
notice is delivered to the courier service, or (iv) if sent by registered mail,
on the 5th Business Day following the day such mailing is made.

    SECTION 8.02.  LEGENDS.  The Purchaser acknowledges that, until registered
under the Securities Act and any applicable state securities laws or transferred
pursuant to the provisions of Rule 144 promulgated under the Securities Act
("Rule 144"), each certificate representing a Share, whether upon initial
issuance or upon any transfer thereof, shall bear a legend (and the Company and
its transfer agent shall make a notation on its books of transfer to such
effect), prominently stamped or printed thereon, in substantially the following
form:


                                     26

<PAGE>


    "THE SECURITIES REPRESENTED BY THIS CERTIFICATE HAVE NOT BEEN
    REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"),
    OR THE SECURITIES LAWS OF ANY APPLICABLE STATE OR OTHER JURISDICTION,
    HAVE BEEN ACQUIRED FOR INVESTMENT AND NOT WITH A VIEW TO DISTRIBUTION
    OR RESALE AND MAY NOT BE SOLD, MORTGAGED, PLEDGED, HYPOTHECATED OR
    OTHERWISE TRANSFERRED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION
    STATEMENT COVERING SUCH SECURITIES UNDER THE ACT AND ANY SECURITIES
    LAWS OF ANY APPLICABLE STATE OR OTHER JURISDICTION OR A WRITTEN
    OPINION OF COUNSEL IN FORM AND SUBSTANCE SATISFACTORY TO THE ISSUER TO
    THE EFFECT THAT REGISTRATION IS NOT REQUIRED UNDER THE ACT OR UNDER
    OTHER APPLICABLE SECURITIES LAWS."

    SECTION 8.03.  TERMINATION.  If the Initial Closing has not occurred on or
prior to June 30, 1997, or if prior to the Initial Closing the Company or the
Purchaser has been notified that the United States Department of Justice or the
Federal Trade Commission, or any other Federal, state or other governmental
agency or instrumentality the consent of approval of which is contemplated by
the terms of this Agreement, any other Transaction Document, the Biogen
Agreement, the BML Collaboration Agreement or the Loan Agreement, is prepared to
(a) seek a preliminary injunction to enjoin the consummation of the transactions
contemplated hereunder or thereunder or (b) grant such consent or approval upon
the condition that any material action or forbearance of action not otherwise
specifically required of the party choosing to terminate pursuant to this
Section 8.03 be taken, then (i) the Company may terminate this Agreement by
written notice to the Purchaser and (ii) the Purchaser may terminate this
Agreement by written notice to the Company.

    SECTION 8.04.  ENTIRE AGREEMENT.  This Agreement embodies the entire
agreement and understanding between the parties hereto with respect to the
provisions hereof and supersedes all prior oral or written agreements and
understandings relating to the provisions hereof.  No statement, representation,
warranty, covenant or agreement of any kind not expressly set forth in this
Agreement shall affect, or be used to interpret, change or restrict, the express
terms and provisions of this Agreement.



                                     27

<PAGE>

    SECTION 8.05.  MODIFICATIONS AND AMENDMENTS.  The terms and provisions of
this Agreement may be modified or amended only by written agreement executed by
all parties hereto.

    SECTION 8.06.  WAIVERS AND CONSENTS.  Except as other expressly provided
herein, the terms and provisions of this Agreement may be waived, or consent for
the departure therefrom granted, only by written document executed by the party
entitled to the benefits of such terms or provisions.  No such waiver or consent
shall be deemed to be or shall constitute a waiver or consent with respect to
any other terms or provisions of this Agreement, whether or not similar.  Each
such waiver or consent shall be effective only in the specific instance and for
the purpose for which it was given, and shall not constitute a continuing waiver
or consent.

    SECTION 8.07.  ASSIGNMENT.  The rights and obligations under this Agreement
may not be assigned by either party hereto without the prior written consent of
the other party (which consent shall not be unreasonably withheld), except that
the Purchaser without the consent of the Company may assign this Agreement or
any of its rights or obligations to an Affiliate of the Purchaser or to an
entity with which the Purchaser shall merge or consolidate or to which the
Purchaser shall sell or assign all or substantially all of its assets, and
except that the Company without the consent of the Purchaser may assign this
Agreement to an entity with which the Company shall merge or consolidate or to
which the Company shall sell or assign all or substantially all of its assets.

    SECTION 8.08.  BENEFIT.  All statements, representations, warranties,
covenants and agreements in this Agreement shall be binding on the parties
hereto and shall inure to the benefit of the respective successors and permitted
assigns of each party hereto.  Nothing in this Agreement shall be construed to
create any rights or obligations except among the parties hereto, and no person
or entity shall be regarded as a third-party beneficiary of this Agreement.

    SECTION 8.09.  GOVERNING LAW.  This Agreement and the rights and
obligations of the parties hereunder shall be construed in 


                                     28

<PAGE>

accordance with and governed by the law of the State of Delaware, without 
giving effect to the conflict of law principles thereof.

    SECTION 8.10.  SEVERABILITY.  In the event that any court of competent
jurisdiction shall determine that any provision, or any portion thereof,
contained in this Agreement shall be unenforceable in any respect, then such
provision shall be deemed limited to the extent that such court deems it
enforceable, and as so limited shall remain in full force and effect.  In the
event that such court shall deem any such provision, or portion thereof, wholly
unenforceable, the remaining provisions of this Agreement shall nevertheless
remain in full force and effect.

    SECTION 8.11.  INTERPRETATION.  The parties hereto acknowledge and agree
that: (i) each party and its counsel reviewed and negotiated the terms and
provisions of this Agreement and have contributed to its revision; (ii) the rule
of construction to the effect that any ambiguities are resolved against the
drafting party shall not be employed in the interpretation of this Agreement;
and (iii) the terms and provisions of this Agreement shall be construed fairly
as to all parties hereto and not in favor of or against any party, regardless of
which party was generally responsible for the preparation of this Agreement.

    SECTION 8.12.  HEADINGS AND CAPTIONS.  The headings and captions of the
various subdivisions of this Agreement are for convenience of reference only and
shall in no way modify, or affect the meaning or construction of any of the
terms or provisions hereof.

    SECTION 8.13.  ENFORCEMENT.  Each of the parties hereto acknowledges and
agrees that the rights acquired by each party hereunder are unique and that
irreparable damage would occur in the event that any of the provisions of this
Agreement to be performed by the other party were not performed in accordance
with their specific terms or were otherwise breached.  Accordingly, in addition
to any other remedy to which the parties hereto are entitled at law or in
equity, each party hereto shall be entitled to an injunction or injunctions to
prevent breaches of this Agreement by the other party.


                                     29

<PAGE>

    SECTION 8.14.  NO WAIVER OF RIGHTS, POWERS AND REMEDIES.  No failure or
delay by a party hereto in exercising any right, power or remedy under this
Agreement, and no course of dealing between the parties hereto, shall operate as
a waiver of any such right, power or remedy of the party.  No single or partial
exercise of any right, power or remedy under this Agreement by a party hereto,
nor any abandonment or discontinuance of steps to enforce any such right, power
or remedy, shall preclude such party from any other or further exercise thereof
or the exercise of any other right, power or remedy hereunder.  The election of
any remedy by a party hereto shall not constitute a waiver of the right of such
party to pursue other available remedies.  No notice to or demand on a party not
expressly required under this Agreement shall entitle the party receiving such
notice or demand to any other or further notice or demand in similar or other
circumstances or constitute a waiver of the rights of the party giving such
notice or demand to any other or further action in any circumstances without
such notice or demand.

    SECTION 8.15.  EXPENSES.  Each of the parties hereto shall pay its own fees
and expenses in connection with this Agreement and the transactions contemplated
hereby whether or not the transactions contemplated hereby are consummated.

    SECTION 8.16   CONFIDENTIALITY. Each of the Purchaser, on the one hand, and
the Company, on the other hand, acknowledges and agrees that any information or
data it has acquired from the other, not otherwise properly in the public
domain, was received in confidence.  Each party agrees not to divulge,
communicate or disclose, or use to the detriment of the disclosing party or for
the benefit of any other person or persons, or misuse in any way, any
confidential information of the disclosing party concerning the subject matter
hereof; PROVIDED that (i) the foregoing obligation with respect to the
disclosure and use of such information shall not apply to any information which
such party can demonstrate (A) was at the time of disclosure to such party or
thereafter, but prior to its disclosure by such party to any third party,
through no fault of such party, publicly available (other than as a result of
disclosure by such party), (B) has been disclosed to such party on a
nonconfidential basis from a source other than any other party which, to such
party's knowledge, was not prohibited from disclosing such information to 


                                     30

<PAGE>

such party by a legal, contractual, fiduciary or other obligation, (C) has 
been independently developed by the such party without the violation of any 
of my obligations under this Agreement, the Biogen Agreement, the BML 
Collaboration Agreement or the Loan Agreement or (D) is required to be 
disclosed by applicable law (including, without limitation, the federal 
securities laws) and (ii) such party may, if required by subpoena or valid 
legal process, disclose any such information, but only to the extent so 
required and only after using its best efforts to give the other party or 
parties (as the case may be) prior notice of such required disclosure in 
order to afford such party or parties an opportunity to obtain an injunction, 
a protective order or other relief.

    SECTION 8.17   PUBLICITY.  No party shall issue any press release or
otherwise make any public statement with respect to the execution of, or the
transactions contemplated by, this Agreement without the prior written consent
of the other party, except as may be required by applicable law, rule or
regulation; PROVIDED that once such other party has consented to a party's
issuance or making of a press release or public statement, any subsequent
issuance or making of such press release or public statement by such party shall
not require the separate written consent of the other party.  However, the
parties recognize that the Purchaser and the Company are each a publicly held
company obligated under the federal securities laws to make disclosures of
material events affecting it.  Consequently, if advised by counsel that such
party is required to make such announcement under Federal or state securities
laws, the Purchaser or the Company (as the case may be) may make such
announcement.  Such party agrees promptly to inform the other party of such
advice by counsel, provide a copy of such announcement prior to disclosure and,
if practicable, to give the other party an opportunity to comment upon the form
of any required announcement.

    SECTION 8.18.  COUNTERPARTS.  This Agreement may be executed in one or more
counterparts, and by different parties hereto on separate counterparts, each of
which shall be deemed an original, but all of which together shall constitute
one and the same instrument.


                                     31

<PAGE>

    IN WITNESS WHEREOF, the Company and the Purchaser have caused this
Agreement to be executed in their names by their duly authorized officers or
representatives effective as of the date first above written.

                        CV THERAPEUTICS, INC.



                        By:    /s/ Louis Lange
                            ------------------------------------------------
                        Name:   Louis Lange
                        Title:  CEO


                        BIOTECH MANUFACTURING LTD.



                        By:    /s/ James H. M. Kirkness
                            ------------------------------------------------
                        Name:   James H. M. Kirkness
                        Title:  Director





                                     32

<PAGE>
                                                         EXHIBIT A

[COOLEY GODWARD LLP LETTERHEAD]



                                        ALAN C. MENDELSON
                                        415 843-5010
                                        [email protected]


March 10, 1997


Biotech Manufacturing Ltd.
St. Paul's Gate
New Street
St. Helier, Jersey JE48Z
Channel Islands

Ladies and Gentlemen:

We have acted as counsel for CV Therapeutics, Inc., a Delaware corporation 
(the "Company"), in connection with the negotiation and execution of that 
certain Common Stock Purchase Agreement between the Company and you dated as 
of the date hereof (the "Purchase Agreement").  We are rendering this opinion 
pursuant to Section 4.02(iv) of the Purchase Agreement.  Except as otherwise 
defined herein, capitalized terms used but not defined herein have the 
respective meanings given to them in the Purchase Agreement.

In connection with this opinion, we have examined and relied upon the 
representations and warranties as to factual matters contained in and made 
pursuant to the Purchase Agreement by the various parties and originals or 
copies certified to our satisfaction, of such records, documents, 
certificates, opinions, memoranda and other instruments as in our judgment 
are necessary or appropriate to enable us to render the opinion expressed 
below.

As to certain factual matters, we have relied upon a certificate of an 
officer of the Company or a certificate of the Transfer Agent of the Company 
and have not sought to independently verify such matters.  Where we render an 
opinion "to the best of our knowledge" or concerning an item "known to us" or 
our opinion otherwise refers to our knowledge, it is based solely upon (i) an 
inquiry of attorneys within this firm who perform legal services for the 
Company, (ii) receipt of a certificate executed by an officer of the Company 
covering such matters, and (iii) such other investigation, if any, that we 
specifically set forth herein.

In rendering this opinion, we have assumed:  the genuineness and authenticity 
of all signatures on original documents (except the signature on behalf of 
the Company on the Purchase Agreement); the authenticity of all documents 
submitted to us as originals; the conformity to originals of all documents 
submitted to us as copies; the accuracy, completeness and authenticity of 
certificates of public officials; and the due authorization, execution and 
delivery of all documents (except the due authorization, execution and 
delivery by the Company of the Purchase Agreement and the due authorization 
by the Company of the Amendment to the Amended and Restated Investor Rights 
Agreement adding you to the existing Amended and Restated Investor Rights 
Agreement dated May 29, 1996 between the Company and certain investors (the 
"Investor 





<PAGE>

[COOLEY GODWARD LLP LETTERHEAD]

Biotech Manufacturing Ltd.
March 10, 1997
Page 2


Rights Agreement, as amended" and collectively, with the Purchase Agreement, 
the "Agreements")), where authorization, execution and delivery are 
prerequisites to the effectiveness of such documents. We have also assumed:  
that all individuals executing and delivering documents had the legal 
capacity to so execute and deliver; that you have received all documents you 
were to receive under the Purchase Agreement; that the Purchase Agreement is 
and the Investor Rights Agreement, as amended, will be obligations binding 
upon the parties thereto other than the Company; that you have filed any 
required California franchise or income tax returns and have paid any 
required California franchise or income taxes; and that there are no 
extrinsic agreements or understandings among the parties to the Purchase 
Agreement and there will be no extrinsic agreements or understandings among 
the parties to the Investor Rights Agreement, as amended, that would modify 
or interpret the terms of the Agreements or the respective rights or 
obligations of the parties thereunder.

We express no opinion herein concerning any laws other than the federal laws 
of the United States, the laws of the State of California and the Delaware 
General Corporation Law.  We express no opinion as to whether the laws of any 
particular jurisdiction apply, and no opinion to the extent that the laws of 
any jurisdiction other than those identified above are applicable to the 
subject matter hereof.  We are not rendering any opinion as to compliance 
with any antifraud law, rule or regulation relating to securities, or to the 
sale or issuance thereof.

Our opinion in paragraph 2 below with respect to the Company's qualification 
as a foreign corporation is based solely upon obtaining a certificate from an 
officer of the Company to the effect that the Company does not own or lease 
property or have employees or conduct business outside of the State of 
California and that the Company has not been requested by the authorities of 
any state to qualify as a foreign corporation for the transaction of business 
in that state.

With regard to our opinion in paragraph 5 below, with respect to the number 
of shares of Common Stock and Preferred Stock issued and outstanding, we have 
examined and relied solely upon a certificate executed by the Transfer Agent 
for the Company dated as of the close of business on March 7, 1997.  With 
respect to full payment of the outstanding capital stock, we have examined 
and relied upon a certificate executed by an officer of the Company, to the 
effect that the consideration for all outstanding shares of capital stock of 
the Company was received by the Company in accordance with the provisions of 
the applicable Board of Directors resolutions and any plan or agreement 
relating to the issuance of such shares, and we have undertaken no 
independent verification with respect thereto.

With regard to our opinion in paragraph 6 below with respect to material 
defaults under any Specified Documents, we have relied solely upon (i) 
inquiries of officers of the Company and 


<PAGE>

[COOLEY GODWARD LLP LETTERHEAD]

Biotech Manufacturing Ltd.
March 10, 1997
Page 3


(ii) an examination of the agreements and documents set forth as exhibits to 
the Company's Registration Statement on Form S-1, filed with the Securities 
and Exchange Commission on November 19, 1996 (the "Specified Documents").  We 
have made no further investigation.

On the basis of the foregoing, in reliance thereon and with the foregoing 
qualifications, we are of the opinion that:

     1.   The Company has been duly incorporated and is a validly existing 
corporation in good standing under the laws of the State of Delaware. 

     2.   The Company has the requisite corporate power to own or lease its 
property and assets and to conduct its business as it is currently being 
conducted, is qualified as a foreign corporation to do business in California 
and, to the best of our knowledge, is not required to qualify as a foreign 
corporation to do business in any other jurisdiction in the United States.

     3.   The Purchase Agreement has been duly and validly authorized, 
executed and delivered by the Company and constitutes a valid and binding 
agreement of the Company enforceable against the Company in accordance with 
its terms, except as rights to indemnification under the Purchase Agreement 
may be limited by applicable laws and except as enforcement may be limited by 
applicable bankruptcy, insolvency, reorganization, arrangement, moratorium or 
other similar laws affecting creditors' rights, and subject to general equity 
principles and to limitations on availability of equitable relief, including 
specific performance.

     4.   The Investor Rights Agreement, as amended, has been duly and 
validly authorized and when executed and delivered by the Company and the 
other parties thereto, will constitute a valid and binding agreement of the 
Company enforceable against the Company in accordance with its terms, except 
as rights to indemnification under Section 3.5 of the Investor Rights 
Agreement, as amended, may be limited by applicable laws and except as 
enforcement may be limited by applicable bankruptcy, insolvency, 
reorganization, arrangement, moratorium or other similar laws affecting 
creditors' rights, and subject to general equity principles and to 
limitations on availability of equitable relief, including specific 
performance.

     5.   The Company's authorized capital stock consists of 30,000,000 
shares of Common Stock, .001 par value, and 5,000,000 shares of undesignated 
Preferred Stock, .001 par value.  As of the date hereof, and excluding the 
Initial Shares, 6,211,817 shares of Common Stock are issued and outstanding 
and no shares of Preferred Stock are issued and outstanding.  The outstanding 
shares have been duly authorized and validly issued and are fully paid and 
nonassessable.  The Shares have been duly authorized, and upon issuance and 
delivery pursuant 


<PAGE>

[COOLEY GODWARD LLP LETTERHEAD]

Biotech Manufacturing Ltd.
March 10, 1997
Page 4


to the Purchase Agreement and against payment therefor in accordance with the 
terms of the Purchase Agreement, will be validly issued, outstanding, fully 
paid and nonassessable.  

     6.   The execution, delivery and performance by the Company of the 
Purchase Agreement and the issuance and sale of the Initial Shares as 
contemplated by the Purchase Agreement do not violate any provision of the 
Company's Amended and Restated Certificate of Incorporation or Restated 
Bylaws, do not constitute a material default under the provisions of any 
Specified Documents, and do not violate or contravene (a) any governmental 
statute, rule or regulation applicable to the Company or (b) any order, writ, 
judgment, injunction, decree, determination or award which has been entered 
against the Company and of which we are aware, the violation or contravention 
of which would materially and adversely affect the Company, its assets, 
financial condition or operations.

     7.   No consents or approvals of any federal or state governmental body 
or regulatory authority is required for the issuance and sale of the Initial 
Shares, except for the filing of a Form D pursuant to Securities and Exchange 
Commission Regulation D.

This opinion is intended solely for your benefit and is not to be made 
available to or be relied upon by any other person, firm, or entity without 
our prior written consent.

Very truly yours,

Cooley Godward LLP



Alan C. Mendelson




<PAGE>

Confidential treatment has been requested for portions of this document. 
Brackets indicate portions of text that have been omitted. A separate filing 
of such omitted text has been made with the Commission as part of the 
Company's application for confidential treatment.


                                                               Execution Copy

                                   LOAN AGREEMENT 

    This Agreement is made and entered into this 7th day of March, 1997 by 
and between BIOTECH MANUFACTURING LTD. (hereinafter referred to as "BML"), a 
wholly-owned subsidiary of Biogen, Inc. ("BIOGEN"),  located at St. Paul's 
Gate, New Street, St. Helier, Jersey  JE48Z, Channel Islands, and CV 
THERAPEUTICS, INC., a Delaware corporation, located at 3172 Porter Drive, 
Palo Alto, CA 94304 (hereinafter referred to as "CVT").

    WHEREAS, BML is a biopharmaceutical company which develops, manufactures, 
markets and sells pharmaceutical products for human healthcare; and

    WHEREAS, CVT is the owner and/or exclusive licensee of certain 
technology, patent rights and other proprietary know-how related to CVT-124 
and related molecules as hereinafter defined; and

         WHEREAS, CVT is granting an exclusive right and license in and to 
such technology, patent rights and proprietary know-how in the TERRITORY 
pursuant to a Research Collaboration and License Agreement of even date 
herewith between CVT and BML (the "BML AGREEMENT"); and

         WHEREAS, CVT is granting an exclusive right and license in and to 
such technology, patent rights and proprietary know-how outside  the 
TERRITORY pursuant to a Research Collaboration and License Agreement of even 
date herewith between CVT and BIOGEN (the  "BIOGEN AGREEMENT").

    NOW, THEREFORE, in consideration of the mutual promises and other good 
and valuable consideration, the parties agree as follows:

    SECTION 1 - DEFINITIONS.

    The terms used in this Agreement have the following meaning:

    1.1  The term "AFFILIATE" as applied to either party shall mean any company
or other 

<PAGE>

                                                               Execution Copy

legal entity other than the party in question, in whatever country organized, 
controlling, controlled by or under common control with that party. The term 
"control" means ownership or control, directly or indirectly, of at least 
fifty percent (50%) of the outstanding stock or voting rights or the right to 
elect or appoint a majority of the directors.

    1.2  The term "first AGREEMENT YEAR" shall mean the twelve month period 
commencing on the EFFECTIVE DATE.  With respect to any year after the first 
AGREEMENT YEAR, the term "AGREEMENT YEAR" shall mean the twelve month period 
commencing upon an anniversary of the Effective Date.

    1.3  The term "CVT-124" shall mean the [  *  ] of epoxy norbornyl 
xanthine, as defined as CVT-124 in the IND filed on September 20, 1995 and as 
further described in U.S. Patent Application Serial No. [  *  ].

    1.4  The term "EFFECTIVE DATE" shall mean March 10, 1997.

    1.5  The term "FIRST COMMERCIAL SALE" shall mean the initial transfer by 
BML or any of its AFFILIATES or SUBLICENSEES of a PRODUCT to a THIRD PARTY in 
exchange for consideration, following marketing approval by the appropriate 
governmental agency for the country in which the transfer is made.

    1.6  The term "TERRITORY" shall mean all countries and territories of the 
world except:  the United States and all other countries and territories in 
North America and South America.

    1.7  The use herein of the plural shall include the singular, and the use 
of the masculine shall include the feminine.

SECTION 2 - LOAN COMMITMENT.

    BML hereby commits to the following:

    2.1  (a)  BML shall, subject to the terms set forth below, make funds
available to 

- --------------------------
 * Confidential treatment requested.

                                     -2-
<PAGE>

                                                               Execution Copy

CVT for general corporate purposes in the form of a loan or loans to CVT in 
an amount not to exceed TWELVE MILLION AND NO/100 DOLLARS ($12,000,000.00) 
(the "Loan").  Immediately upon the EFFECTIVE DATE, CVT may draw down on the 
Loan an amount not to exceed THREE MILLION AND NO/100 DOLLARS ($3,000,000.00) 
(the "Initial Installment").  Unless the BML AGREEMENT has been terminated 
for any reason, CVT may, in such amounts and at such times as CVT, in it sole 
discretion, may determine, draw down the remaining balance of the Loan (the 
"Loan Remainder") over a period of two (2) Calendar Years (as defined below) 
following the receipt of the Phase II Performance Assessment Study milestone 
payment (the "Milestone Payment") pursuant to the BIOGEN AGREEMENT, PROVIDED 
HOWEVER, that the total draw down amount shall not exceed FOUR MILLION FIVE 
HUNDRED THOUSAND AND NO/100 DOLLARS ($4,500,000.00) in any Calendar Year. For 
the purposes of this section, a "Calendar Year" commences on the date of the 
Milestone Payment or an anniversary thereof and terminates twelve months 
later. BML shall not be obligated to advance any funds under the Loan 
Remainder at any time during which (i) an Event of Default has occurred and 
is continuing under the Note (defined below); (ii) the total cash reserves 
of CVT, as shown on its most recent balance sheet before the particular draw, 
are less than $5 million during the first AGREEMENT YEAR, $7.5 million during 
the second AGREEMENT YEAR, or $10 million thereafter; or (iii) any 
proceeding, voluntary or involuntary, in bankruptcy or insolvency, is pending 
against CVT, or a receiver is operating CVT with or without the consent of 
CVT.  BML's obligation to advance any funds under the Loan Remainder shall 
terminate upon the earlier to occur of (i) the last day of the second 
Calendar Year or (ii) termination or expiration of this Agreement.

         (b)  On the EFFECTIVE DATE CVT shall execute and deliver to BML an 
unsecured note, substantially in the form set forth in APPENDIX A attached 
hereto and made a part hereof (the "Note"), evidencing the Loan.  CVT hereby 
covenants not to incur or maintain any additional PARI PASSU or senior 
indebtedness of any kind, other than leasehold improvements or 


                                     -3-
<PAGE>

                                                               Execution Copy

equipment lease financing in an aggregate amount not exceeding $10 million 
(including any such debt outstanding as of the Effective Date), while any 
amount due under the Note remains unpaid.  Any junior indebtedness permitted 
to be incurred pursuant to the previous sentence shall be subordinated to the 
Note pursuant to a subordination agreement in form and substance reasonably 
satisfactory to BML. The Note shall be subordinated to all debt of CVT 
existing as of the date hereof and may be prepaid by CVT at any time without 
penalty, in cash or, in the case of the Loan Remainder, in CVT Common Stock, 
registered for resale, priced at its then Fair Market Value (as defined in 
Section 2.1(i) below), subject to the provisions of subsections (g) and (i) 
of this Section 2.1.

         (c)  The Note shall bear interest on the outstanding principal 
amount thereof at a rate per annum equal to Prime (defined below) plus one 
(1%) percent.  Such interest shall be payable in cash annually commencing on 
the one year anniversary of the date of execution of the Note and continuing 
on each anniversary date until the Note is paid in full, regardless of the 
repayment terms applicable to the principal amount of the Note as specified 
in this Section 2.1.  The applicable rate of interest for the Note shall be 
adjusted semi-annually according to the Prime rate as announced on each 
six-month anniversary date of the execution of the Note.

         (d)  Except as otherwise provided in subsection (f) hereof, CVT 
shall repay the principal amount owed under the Initial Installment in cash 
in sixty (60) equal monthly installments on the first day of each month 
commencing on the third anniversary of the Effective Date and continuing on 
the same day of each succeeding month such that the entire principal amount 
due under the Initial Installment shall be paid in full by the eighth 
anniversary of the Effective Date.  

         (e)  Except as otherwise provided in this subsection (e) or in 
subsection (f) hereof, CVT shall repay the principal amount owed under the 
Loan Remainder solely out of royalties owed from BIOGEN and BML to CVT 
according to the following schedule:

                                     -4-
<PAGE>

                                                               Execution Copy

         Beginning with the date that is eighteen (18) months after
         the FIRST COMMERCIAL SALE of PRODUCT, BML's and BIOGEN's
         royalty payments to CVT (as provided in Section 10.2(a) of
         the BML AGREEMENT and Section 10.2(a) of the BIOGEN
         AGREEMENT, respectively) shall be reduced by thirty-three
         and one-third (33.3%) percent until the principal balance of
         the Loan Remainder is paid in full.  

In the alternative, CVT may, at its option, elect to repay the principal 
amount owed under the Loan Remainder in CVT Common Stock, registered for 
resale, priced at its then Fair Market Value, subject to the provisions of 
subsections (g) and (i) of this Section 2.1.

         (f)  Notwithstanding the provisions of subsections (d) and (e) 
hereof, if this Agreement is terminated for any reason, CVT shall repay the 
principal and interest owed under the Initial Installment and the Loan 
Remainder in 36 monthly installments commencing on the fifth (5th) business 
day following the date the Agreement is terminated and continuing on the same 
day of each succeeding month.  Repayment of the Initial Installment shall be 
made in cash; repayment of the Loan Remainder shall be made in cash or, at 
CVT's option, in CVT Common Stock, registered for re-sale, priced at its then 
Fair Market Value, subject to the provisions of subparagraphs (g) and (i) of 
this Section 2.1.

         (g)  In the event CVT elects pursuant to subsection (b), (e) or (f)
hereof to repay all or a portion of the Loan Remainder in CVT Common Stock, CVT
shall give BML at least thirty (30) days advance written notice of the date and
amount of any repayment to be made in CVT Common Stock, and include in such
notice a calculation of the percentage of CVT's total shares of Common Stock
outstanding that would be held by BML and its AFFILIATES after the issuance of
such shares (assuming an issue price equal to the closing price of CVT Common
Stock on the day prior to such notice).  Such notice shall irrevocably bind CVT
to make such payment 


                                     -5-
<PAGE>

                                                               Execution Copy

in the amount and on the date indicated, subject only to the following 
provisos: (i) CVT shall have the right to extend the closing date by up to an 
additional thirty (30) days in order to complete registration of the shares, 
and (ii) if  receipt of such Common Stock would cause BML's and its 
AFFILIATES' holdings in CVT to exceed 19.9% of CVT's total shares of Common 
Stock outstanding after the issuance of such shares to BML, BML may notify 
CVT that it will not accept repayment in CVT Common Stock to the extent of 
such excess.  Within ten (10) days of receipt of such notification, CVT and 
BML shall meet to negotiate in good faith to arrive at a mutually acceptable 
alternative payment arrangement.  If the parties are unable to agree on such 
an alternative payment arrangement within thirty (30) days of CVT's receipt 
of BML's notification, then the excess of the Loan Remainder shall be 
repayable in sixty (60) equal monthly installments, commencing on the 
expiration of such thirty (30) day negotiation period and continuing on the 
same day of each succeeding month.  Notwithstanding the foregoing, in order 
to insure for CVT the benefits of the transactions contemplated in this 
Agreement and the Common Stock Purchase Agreement between the parties of even 
date herewith (the "Stock Purchase Agreement"), to the extent that BML has 
acquired Voting Securities (as defined in the Stock Purchase Agreement) in 
transactions other than those described in Article III of the Stock Purchase 
Agreement and in this Agreement ("Other Voting Securities") BML will sell 
such Other Voting Securities in order to permit the repayment of the Loan 
Remainder in CVT Common Stock as contemplated herein without violation of the 
19.9% limit on BML's and its AFFILIATES' ownership in CVT as set forth above.

              (h)  For purposes of subsection (c) of this Section 2.1, 
"Prime" shall mean the floating rate of interest reported by the WALL STREET 
JOURNAL as the prevailing base rate on corporate loans posted by at least 75% 
of the 30 largest banks in the United States.  In the event that the WALL 
STREET JOURNAL ceases to publish such a rate, or modifies its criteria for 
such rate, the term "Prime" shall mean the generally prevailing base 
corporate lending rate of large United States 


                                     -6-
<PAGE>

                                                               Execution Copy

banks as determined in good faith by BML.

         (i)   For purposes of subsection (b), (e) and (f) of this Section 
2.1, "Fair Market Value" of CVT Common Stock shall mean: the average of the 
closing prices as reported by NASDAQ or, if not traded on NASDAQ, by such 
other principal securities exchange on which the shares are traded, as 
applicable, over the twenty (20) trading days preceding the date on which 
payment is due (or in the case of an extension pursuant to subsection (g)(i), 
the date on which the payment is made).   BML and CVT shall execute and 
deliver at the time of issuance of any shares in repayment of the Loan 
Remainder a stock purchase agreement containing customary representations and 
warranties and indemnities in form and substance similar to those set forth 
in the Stock Purchase Agreement and the related Amended and Restated Investor 
Rights Agreement, as amended, and customary provisions regarding registration 
of the shares.  Delivery of any shares of Common Stock shall take place no 
later than five (5) days after the repayment date.

                                     -7-
<PAGE>

                                                               Execution Copy

         (j)  BML will not, nor will it permit any of its Affiliates (as such 
term is used in Rule 12b-2 of the Securities Exchange Act of 1934 (the 
"Exchange Act"), such term to have such definition as used throughout this 
Agreement) to, from the date CVT gives BML notice of its election under 
subsection (e) above to repay the principal amount of the Loan Remainder in 
CVT Common Stock until the applicable determination of "Fair Market Value" of 
CVT Common Stock hereunder, (a) acquire any Voting Securities (as defined in 
Section 7.01 of the Stock Purchase Agreement), (b) offer, pledge, sell, 
contract to sell, sell any option or contract to purchase, purchase any 
option or contract to sell, grant any option, right or warrant to purchase, 
or otherwise transfer or dispose of, directly or indirectly, any Voting 
Securities or (c) enter into any swap or similar agreement that transfers, in 
whole or in part, the economic risk of ownership of Voting Securities, 
whether any such transaction described in clause (a), (b) or (c) above is to 
be settled by delivery of Voting Securities or such other securities, in cash 
or otherwise.

         (k)  COMPLIANCE WITH NASDAQ STOCK MARKET RULE 4460(i)(1)(D). 
Notwithstanding any provision of this Agreement to the contrary, except as 
otherwise permitted by the rules of the NASDAQ Stock Market, CVT shall in no 
event be obligated to issue, and BML shall in no event be obligated to 
accept, in repayment of the Loan Remainder, shares of CVT Common Stock to the 
extent that such issuance would result in the number of shares of Common 
Stock tendered hereunder and purchased pursuant to the Stock Purchase 
Agreement constituting (i) the sale or issuance of 20% or more of the Common 
Stock or (ii) the sale or issuance of securities constituting 20% or more of 
voting power for less than the greater of book or market value.

    SECTION 3 - REPRESENTATIONS AND WARRANTIES.

    3.1  Each party represents and warrants to the other party that: (i) it is
free to enter into this Agreement; (ii) in so doing, it will not violate any
other agreement to which it is a party; and (iii) it has taken all corporate
action necessary to authorize the execution and delivery of this 


                                     -8-
<PAGE>

                                                               Execution Copy

Agreement and the performance of its obligations under this Agreement.

    3.2  Each party represents that it is not aware of any action, suit, 
inquiry or investigation or any claim, demand or notice of default which if 
adversely determined would affect the rights granted under this Agreement.

    SECTION 4 -  ASSIGNMENT; SUCCESSORS.

    4.1  This Agreement shall not be assignable by BML without the prior 
written consent of CVT (which consent shall not be unreasonably withheld), 
except that BML without the consent of CVT may assign this Agreement or any 
of its rights and obligations hereunder to an AFFILIATE or to an entity with 
which BML shall merge or consolidate or to which BML shall sell or assign all 
or substantially all of its assets. CVT may not assign this Agreement or any 
rights hereunder without the express written consent of BML. In the event CVT 
merges or consolidates with, or sells or assigns all or substantially all of 
its assets to, an entity, then, notwithstanding any contrary provision 
hereof, (a) BML shall not be obligated to advance any further sums pursuant 
hereto, and (b) all sums then outstanding under the Note shall be repayable 
in cash in 36-monthly equal installments commencing on the date of such event 
and continuing on the same day of each succeeding month. 

    4.2  Subject to the limitations on assignment herein, this Agreement 
shall be binding upon and inure to the benefit of said successors in interest 
and assigns of CVT and BML. 

    SECTION 5 - TERMINATION.

    5.1  Except as otherwise provided herein, this Agreement shall terminate 
on the earlier to occur of (i) the termination of the BML AGREEMENT,  or (ii) 
the last day of the second Calendar Year.

    5.2  Either party to this Agreement may, upon giving notice of 
termination, immediately 


                                     -9-
<PAGE>

                                                               Execution Copy

terminate this Agreement upon receipt of notice that the other party has 
become insolvent or has suspended business in all material respects hereof, 
or has consented to an involuntary petition purporting to be pursuant to any 
reorganization or insolvency law of any jurisdiction, or has made an 
assignment for the benefit of creditors or has applied for or consented to 
the appointment of a receiver or trustee for a substantial part of its 
property.

    5.3  CVT's repayment obligation under the Note shall survive any 
termination of this Agreement.

    SECTION 6 - GENERAL PROVISIONS.

    6.1  This Agreement, the BML AGREEMENT, the BIOGEN AGREEMENT, and the 
Stock Purchase Agreement between the parties of even date herewith set forth 
the entire agreement and understanding between the parties as to the subject 
matter hereof and supersede all prior agreements in this respect.  There 
shall be no amendments or modifications to these Agreements, except by a 
written document which is signed by both parties.

    6.2  This Agreement shall be construed and enforced in accordance with 
the laws of the State of Delaware, U.S.A. without reference to its 
choice-of-law principles.

    6.3  The headings in this Agreement have been inserted for the 
convenience of reference only and are not intended to limit or expand on the 
meaning of the language contained in the particular or section or paragraph.

    6.4  Any delay in enforcing a party's rights under this Agreement or any 
waiver as to a particular default or other matter shall not constitute a 
waiver of a party's right to the future enforcement of its rights under this 
Agreement, excepting only as to an expressed written and signed waiver as to 
a particular matter for a particular period of time.

    6.5  NOTICES.  Any notices given pursuant to this Agreement shall be in 
writing and shall be deemed delivered upon the earlier of (i) when received 
at the address set forth below, or (ii) 


                                     -10-
<PAGE>

                                                               Execution Copy

three (3) business days after mailed by certified or registered mail postage 
prepaid and properly addressed, with return receipt requested, or (iii) when 
sent, if sent, by facsimile, as confirmed by certified or registered mail.  
Notices shall be delivered to the respective parties as indicated:

    If to CVT:     CV Therapeutics, Inc.
                   3172 Porter Drive
                   Palo Alto, CA 94304
                   Attn: CEO

                   with a copy to:     Cooley Godward LLP
                                       3000 El Camino Real
                                       Palo Alto, CA 94306
                                       Attn:  Robert L. Jones, Esq.
                                              Deborah A. Marshall, Esq.
    
    If to BML:     Biotech Manufacturing Ltd.
                   St. Paul's Gate
                   New Street
                   St. Helier, Jersey JE48Z
                   Channel Islands

                   with a copy to:     Biogen, Inc.
                                       14 Cambridge Center
                                       Cambridge, MA 02142
                                       Attn: Vice President - General Counsel

    6.6  This Agreement may be executed in any number of separate 
counterparts, each of which shall be deemed to be an original, but which 
together shall constitute one and the same instrument.


                                     -11-
<PAGE>

                                                               Execution Copy

    IN WITNESS WHEREOF, the parties have executed this Agreement as of the 
date set forth above.

CV THERAPEUTICS, INC.                    BIOTECH MANUFACTURING LTD.

By: /s/ Louis Lange                      By: /s/ James H.M. Kirkness
   -----------------------------            ------------------------------

Name:  Louis Lange                       Name:  James H.M. Kirkness
     ---------------------------              ----------------------------

Title:   CEO                             Title:  Director
      --------------------------               ---------------------------


                                     -12-
<PAGE>


                                      APPENDIX A


                                     FORM OF NOTE


<PAGE>

                             PROMISSORY NOTE

$12,000,000.00                                                   MARCH 10, 1997

    FOR VALUE RECEIVED, the undersigned, CV THERAPEUTICS, INC. (the 
"Borrower"), having an address at 3172 Porter Drive, Palo Alto, California 
94304, hereby promises to pay to the order of BIOTECH MANUFACTURING LIMITED, 
having an address at St. Paul's Gate, New Street, St. Heller, Jersey JE48Z, 
Channel Islands (the "Lender"), the principal sum of

                   TWELVE MILLION DOLLARS ($12,000,000)

or such lesser sum which may from time to time be advanced pursuant to the 
terms of the Loan Agreement dated March 7, 1997 between the Borrower and the 
Lender (the "Agreement"). Capitalized terms used herein and not defined 
herein have the meanings assigned to them in the Agreement.

    PRINCIPAL

    (a)  The Borrower shall pay the principal balance of this note which 
represents the Initial Installment in sixty (60) equal consecutive monthly 
payments commencing on March 10, 2000 and continuing on the like day of each 
subsequent month until February 10, 2005. The last principal payment shall 
include all other amounts due hereunder (including, without limitation, all 
accrued interest plus costs of collection); except any amounts of principal 
that are not yet due on account of the Loan Remainder. All payments pursuant 
to paragraph (a) hereunder shall be in cash.

    (b)  Except as otherwise provided in paragraph (c) hereof, the Borrower 
shall pay the principal balance of this note which represents the Loan 
Remainder out of royalties owed from Lender and BIOGEN to Borrower according 
to the following schedule:

         (i)  Beginning on the date that is eighteen (18) months after the 
FIRST COMMERCIAL SALE of PRODUCT, Lender's and BIOGEN's royalty payments to 
Borrower (as provided in Section 10.2(a) of the BML AGREEMENT and Section 
10.2(a) of the BIOGEN AGREEMENT, respectively) shall be reduced by 
thirty-three and one-third (33.3%) percent and the amount of reduction shall 
be deducted from the principal balance of the Loan Remainder until the Loan 
Remainder is reduced to zero (0), at which time the principal balance of the 
Loan Remainder shall be deemed to have been paid in full.

    In the alternative, if no Event of Default has occurred and is continuing 
under the Note, the Borrower may, at its option, elect to repay the principal 
amount owed under the 


<PAGE>

Loan Remainder in CVT Common Stock, registered for resale, priced at its then 
Fair Market Value, subject to the provisions of Sections 2.1(g) and 2.1(i) of 
the Agreement.

    (c)  Notwithstanding paragraphs (a) and (b), if the Agreement is 
terminated for any reason, Borrower shall repay the principal owed under the 
Initial Installment and the Loan Remainder in 36-monthly equal installments 
commencing on the date the Agreement is terminated and continuing on the same 
day of each succeeding month, with the final payment to be accompanied by a 
payment of all other amounts due hereunder. Repayment of the Initial 
Installment shall be made in cash; repayment of the Loan Remainder shall be 
made in cash or, in the absence of a default, at the option of Borrower, in 
CVT Common Stock, registered for resale, priced at its then Fair Market 
Value, subject to the provisions of Sections 2.1(g) and 2.1(i) of the 
Agreement.

    (d)  Notwithstanding anything contained in paragraph (b) and (c) above, 
Lender may require that Borrower repay amounts borrowed in cash rather than 
CVT Common Stock to the extent necessary to ensure that the repayment of 
Common Stock will not cause Lender's and its AFFILIATES' holdings in Borrower 
to exceed nineteen and nine-tenths (19.9%) percent of CVT's total shares of 
Common Stock outstanding after the completion of such sales to Lender, as set 
forth in Section 2.1(g) of the Agreement.

    INTEREST

    Interest shall accrue on the outstanding principal balance hereunder at a 
rate per annum equal to Prime plus 1%. Prime shall be determined and adjusted 
in accordance with Section 2.1(h) of the Agreement. Payments of interest 
shall be made annually commencing on the one year anniversary date of the 
execution of the Note and continuing on each anniversary date until all 
amounts due hereunder have been paid in full. The applicable rate of interest 
shall be adjusted semi-annually according to the Prime Rate as announced on 
each six month anniversary date. Interest shall be calculated on the basis of 
actual days elapsed and a 360-day year.

    The advances described in the Agreement and made by the Lender to the 
Borrower, and all repayments made on the account of principal thereof, shall 
be recorded by the Lender, on the Schedule attached hereto which is a part of 
this Note; provided, however, that the failure of the Lender so to record on 
this Note (or any error in recording on this Note) shall not affect the 
Borrower's obligations hereunder.

    Payments hereon are to be made in lawful money of the United States of 
America or in any other permitted manner set forth in the Agreement at the 
Lender's address set forth above or such other address as the Lender shall 
designate in writing to the Borrower.


<PAGE>

    If any amount due under this Note is not paid in full within 10 days of 
the due date, whether as stated or by acceleration, interest on the unpaid 
principal balance shall continue to accrue and shall thereafter be increased 
effective as of such due date to a rate per annum equal to three (3%) percent 
above the Prime Rate.

    It is the intent of the Lender and of the Borrower that in no event shall 
interest be payable at a rate in excess of the maximum rate permitted by 
applicable law (the "Maximum Legal Rate"). Solely to the extent necessary to 
prevent interest under this Note from exceeding the Maximum Legal Rate, any 
amount that would be treated as excessive under a final judicial 
interpretation of applicable law shall be deemed to have been a mistake and 
automatically canceled and, if received by the Lender, shall be applied to 
the principal balance of this Note or, if no principal balance remains 
outstanding, then such amount shall be refunded to the Borrower.

    The Borrower may voluntarily prepay this Note in whole or in part at any 
time and from time to time without penalty, together with interest accrued on 
the amount prepaid through the date of prepayment. Prepayments of principal 
which represents the Initial Installment shall be made in cash; prepayments 
of principal which represents the Loan Remainder shall be made in cash or, in 
the absence of a default, at the option of the Borrower, in CVT Common Stock, 
registered for resale, priced at its then Fair Market Value, subject to the 
provisions of Sections 2.1(g) and 2.1(i) of the Agreement.

    Upon the occurrence of any one or more of the following events (each, an 
"Event of Default") subject to expiration of any applicable grace or cure 
periods, the Lender at its option may declare all amounts due hereunder, 
including, without limitation, the entire unpaid principal balance of this 
Note and any accrued, unpaid interest thereon, to be immediately due and 
payable in cash without notice or protest (both of which are hereby waived):

         (a)  The failure to make any payment of principal or interest due
         pursuant to the terms of this Note within ten (10) days after the due
         date;

         (b)  The failure to promptly, punctually, and faithfully perform or
         discharge any material liability or obligation of the Borrower to the
         Lender;

         (c)  The material breach by Borrower of any material covenant set
         forth in the Agreement;

         (d)  The determination by the Lender that any material representation
         or warranty now or hereafter made by the Borrower to the Lender in any 
         document, instrument, agreement, or paper was not true or accurate 
         when given;

<PAGE>

         (e)  The commencement by the Borrower of a voluntary case under 11
         U.S.C. '101 ET. SEQ. (the "Bankruptcy Code") or any foreign, federal
         or state bankruptcy, insolvency or other similar law now or hereafter
         in effect, or (ii) the consent by the Borrower to the entry of an
         order for relief in an involuntary bankruptcy or similar case, or to
         the conversion of an involuntary case to a voluntary case, under any
         such law, or (iii) the consent by the Borrower to the appointment of,
         or the taking of possession by, a receiver, trustee or other custodian
         for all or a substantial part of its properties, or (iv) the making by
         the Borrower of any assignment for the benefit of creditors, or (v)
         the admission by the Borrower in writing of its inability to pay its
         debts as such debts become due, or (vi) the death, discontinuance of
         business, dissolution, winding up, liquidation or cessation of
         existence by the Borrower;

         (f)  The entry by a court of a decree or order for relief with respect
         to the Borrower in an involuntary case under the Bankruptcy Code or
         any applicable foreign, federal or state bankruptcy, insolvency or
         other similar law now or hereafter in effect, which decree or order is
         not stayed or dismissed within 60 days of the entry thereof, or (ii)
         the entry by a court of a decree or order for the appointment of a
         receiver, liquidator, sequestrator, trustee, custodian or other person
         having similar powers over the Borrower or over all or a substantial
         part of its properties;

         (g)  A judgment, decree, writ, warrant of attachment or similar
         process in an amount equal to or exceeding ten percent (10%) of
         Borrower's "Free Cash" ["Free Cash" = unrestricted cash less debt owed
         to third parties other than Lender] is entered against the Borrower or
         any of its assets, if such judgment, decree, writ, warrant of
         attachment or similar process is not adequately covered by insurance
         or has not been vacated, discharged, appealed from (with execution or
         similar process continuously stayed) within fifteen (15) days of such
         judgment's entry;

         (h)  The service of any process upon the Lender seeking to attach by
         mesne or trustee process, or otherwise, any funds of the Borrower on
         deposit with the Lender or owed by the Lender to the Borrower;

         (i)  The occurrence of any event such that any indebtedness of the
         Borrower, in an amount equal to or exceeding ten percent (10%) of
         Borrower's Free Cash, which is owed to a person or entity other than
         the Lender could be accelerated, notwithstanding that such
         acceleration has not taken place; and

         (j)  The beneficial ownership at any time of forty percent (40%) or
         more of 

<PAGE>

         the issued and outstanding capital stock of the Borrower having 
         voting rights becomes owned by persons or entities who were not 
         such owners on the date of execution of this Note.

    Upon the occurrence and continuance of any Event of Default hereunder, 
(i) the Lender may declare the principal balance of this Note to be 
immediately due and payable in cash, PROVIDED, HOWEVER, in the case of an 
Event of Default described in paragraphs (e) or (f) above, all amounts 
payable by the Borrower hereunder, including, without limitation, the 
principal balance and all accrued interest on this Note, shall automatically 
become immediately due and payable in cash, without notice, action or 
election by the Lender, and (iii) the Lender may enforce any other rights 
granted pursuant to this Note, any other document, or by applicable law. All 
of the rights of the Lender hereunder shall be cumulative and not exclusive, 
and each of which may be exercised singly, repetitively, in any combination, 
and in any order. The Lender's rights and remedies hereunder, subject to the 
limitation expressed in Section 2.1(b) of the Agreement, may be exercised 
without resort or regard to any other source of satisfaction of any 
liabilities owing by the Borrower to the Lender. No inconsistency between the 
default provisions of this Note and any other agreement shall be deemed to 
create any additional notice, cure or grace period or derogate from the 
express terms of such provisions.

    The Borrower agrees to pay on demand all costs and expenses (including, 
without limitation, the reasonable fees and out-of-pocket expenses of legal 
counsel) incurred by the Lender in connection with enforcing or exercising 
any rights or remedies under this Note, whether or not legal action is 
instituted. Any fees, expenses or other charges which the Lender is entitled 
to receive from the Borrower hereunder shall constitute an obligation of the 
Borrower pursuant to this Note, and shall bear interest until paid at a rate 
per annum equal to the maximum rate in effect and permitted hereunder.

    Any deposits or other sums at any time credited by or due from the Lender 
to the Borrower, and any securities or other property of the Borrower which, 
at any time, shall be in the possession of the Lender, may be held and 
treated as collateral for the payment of this Note and any and all other 
liabilities (direct or indirect, absolute or contingent, sole, joint, or 
several, secured or unsecured, due or to become due, now existing or 
hereafter arising) of the Borrower to the Lender. Upon the occurrence of an 
Event of Default, subject to the expiration of any applicable grace or cure 
periods, and to the limitation expressed in Section 2.1(b) of the Agreement, 
and regardless of the adequacy of collateral, the Lender may apply or set off 
such deposits or other property against such liabilities.

    The Borrower hereby waives presentment, demand, protest or notice of any 
kind in connection with this Note. No failure on the part of the Lender in 
exercising any right or remedy hereunder, and no single, partial or delayed 
exercise by the Lender of any right or remedy shall preclude the full and 
timely exercise by the Lender at any time of any right or 

<PAGE>

remedy of the Lender hereunder without notice. No course of dealing or other 
conduct, no oral agreement or representation made by the Lender or usage of 
trade shall operate as a waiver of any right or remedy of the Lender. This 
Note contains the entire agreement between the parties with respect to the 
subject matter hereof, and supersedes every course of dealing, other conduct, 
oral agreement or representation previously made by the Lender.  In the event 
that any court of competent jurisdiction shall determine that any provision, 
or portion thereof, contained in this Note shall be unenforceable in any 
respect, then such provision shall be deemed limited to the extent that such 
court deems it enforceable, and the remaining provisions of this Note shall 
nevertheless remain in full force and effect.

    None of the terms or provisions of this Note may be excluded, modified, 
or amended except by a written instrument duly executed on behalf of both the 
Borrower and the Lender expressly referring hereto and setting forth the 
provision so excluded, modified or amended. No waiver or forbearance of any 
of the rights and remedies of the Lender hereunder shall be effective unless 
made specifically in a writing signed by the Lender, and any such waiver or 
forbearance shall be effective only in the specific instance and for the 
specific purpose for which given.

    This Note is the "Note" referred to in the Agreement and is entitled to 
all of the rights and benefits referred to therein.

    This Note shall be binding upon the Borrower and shall be enforceable 
against the Borrower and its heirs, successors and representatives, and shall 
inure to the benefit of the Lender and its successors, endorsees and assigns. 
The Borrower may not assign this Note or any rights hereunder without the 
express written consent of the Lender.

    In the event CVT merges or consolidates with, or sells or assigns all or 
substantially all of its assets to, an entity, then, notwithstanding any 
contrary provision hereof or of the Agreement, (a) Lender shall not be 
obligated to advance any further sums pursuant to the Agreement, and (b) all 
sums then outstanding hereunder shall be repayable in cash in 36-monthly 
equal installments commencing on the date of such event and continuing on the 
same day of each succeeding month.

    If more than one Borrower signs this Note, the term "Borrower" shall 
include each such signatory, individually and collectively, and each such 
signatory, together with any endorser' or guarantor of this Note, shall be 
jointly and severally liable hereunder. No person obligated on account of 
this Note may seek contribution from any other person also obligated hereon 
unless and until all liabilities to the Lender of the person from whom 
contribution is sought have been satisfied in full.

    THIS NOTE IS DELIVERED TO THE LENDER AT ITS PRINCIPAL OFFICE IN 

<PAGE>

ST. HELIER, JERSEY, CHANNEL ISLANDS, AND SHALL BE GOVERNED BY, AND CONSTRUED 
AND ENFORCED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF DELAWARE, WITHOUT 
REGARD TO ITS PRINCIPLES OF CONFLICTS OF LAWS AND SHALL TAKE EFFECT AS A 
SEALED INSTRUMENT.

    THE BORROWER HEREBY EXPRESSLY, KNOWINGLY AND VOLUNTARILY WAIVES ALL 
RIGHTS TO TRIAL BY JURY IN ANY ACTION OR PROCEEDING ARISING OUT OF, IN 
CONNECTION WITH, OR RELATED TO THIS NOTE, INCLUDING, WITHOUT LIMITATION, IN 
CONNECTION WITH ANY DEFENSE, AFFIRMATIVE DEFENSE, COUNTERCLAIM OR THE LIKE 
ASSERTED AGAINST THE LENDER.

<PAGE>

    IN WITNESS WHEREOF, the Borrower has caused this Note to be executed as 
an instrument under seal by its duly authorized officer as of the date first 
above written.

witness:                                  CV THERAPEUTICS, INC.


- -------------------------------           -----------------------------
                                          (Signature)

                                          By:
                                             --------------------------
                                               (Print or type name)

                                          Its:
                                              -------------------------
                                               (Title or Capacity)

<PAGE>

EXHIBIT 11.1

                              CV THERAPEUTICS, INC.

                        COMPUTATION OF NET LOSS PER SHARE

                    (IN THOUSANDS, EXCEPT PER SHARE AMOUNTS)
                                   (UNAUDITED)

<TABLE>
<CAPTION>
                                                                                  THREE MONTHS ENDED MARCH 31,
                                                                                  ----------------------------
                                                                                     1997           1996 
                                                                                     ----           ----
<S>                                                                               <C>            <C>
 Net loss. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .         $(1,885)       $(3,379)
                                                                                   -------        -------
                                                                                   -------        -------
 Historical:
   Weighted average common stock outstanding:. . . . . . . . . . . . . . .           6,346            370
     Shares related to Staff Accounting Bulletins Nos. 55, 64 and 83:
       Stock options . . . . . . . . . . . . . . . . . . . . . . . . . . .               -            340
       Warrants. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .               -            965
                                                                                   -------        -------
 Total shares used in calculating net loss per share . . . . . . . . . . .           6,346          1,675
                                                                                   -------        -------
                                                                                   -------        -------

 Net loss per share. . . . . . . . . . . . . . . . . . . . . . . . . . . .          $(0.30)        $(2.02)
                                                                                   -------        -------
                                                                                   -------        -------

 Pro forma:
   Shares used in calculating net loss per share (per above) . . . . . . .                          1,675
   Preferred Stock if-converted: . . . . . . . . . . . . . . . . . . . . .                          2,573
                                                                                                  -------
 Total shares used in calculating pro forma net loss per share . . . . . .                          4,248
                                                                                                  -------

 Pro forma net loss per share. . . . . . . . . . . . . . . . . . . . . . .                         $(0.80)
                                                                                                  -------
                                                                                                  -------
</TABLE>


<TABLE> <S> <C>

<PAGE>
<ARTICLE> 5
       
<S>                             <C>
<PERIOD-TYPE>                   3-MOS
<FISCAL-YEAR-END>                          DEC-31-1996
<PERIOD-START>                             JAN-01-1997
<PERIOD-END>                               MAR-31-1997
<CASH>                                      17,300,000
<SECURITIES>                                14,100,000
<RECEIVABLES>                                1,100,000
<ALLOWANCES>                                         0
<INVENTORY>                                          0
<CURRENT-ASSETS>                            31,900,000
<PP&E>                                       6,100,000
<DEPRECIATION>                               3,200,000
<TOTAL-ASSETS>                              38,800,000
<CURRENT-LIABILITIES>                        4,000,000
<BONDS>                                      7,200,000
                                0
                                          0
<COMMON>                                    70,600,000
<OTHER-SE>                                           0
<TOTAL-LIABILITY-AND-EQUITY>                38,800,000
<SALES>                                              0
<TOTAL-REVENUES>                               800,000
<CGS>                                                0
<TOTAL-COSTS>                                        0
<OTHER-EXPENSES>                             2,800,000
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                             100,000
<INCOME-PRETAX>                                      0
<INCOME-TAX>                                         0
<INCOME-CONTINUING>                                  0
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                               (1,900,000)
<EPS-PRIMARY>                                   (0.30)
<EPS-DILUTED>                                   (0.30)
        

</TABLE>


© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission