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                                                                 EXHIBIT 10.29





                             COR THERAPEUTICS, INC.
                       1991 EMPLOYEE STOCK PURCHASE PLAN
                             (ADOPTED MAY 14, 1991)
                           (AMENDED JANUARY 6, 1995)
                          (AMENDED NOVEMBER 15, 1996)
                           (AMENDED JANUARY 24, 1997)


1.       PURPOSE.

         (a)     The purpose of the 1991 Employee Stock Purchase Plan ("the
Plan") is to provide a means by which employees of COR Therapeutics, Inc., a
Delaware corporation (the "Company"), and its Affiliates, as defined in
subparagraph 1(b), which are designated as provided in subparagraph 2(b), may
be given an opportunity to purchase stock of the Company.

         (b)     The word "Affiliate" as used in the Plan means any parent
corporation or subsidiary corporation of the Company, as those terms are
defined in Sections 424(e) and (f), respectively, of the Internal Revenue Code
of 1986, as amended (the "Code").

         (c)     The Company, by means of the Plan, seeks to retain the
services of its employees, to secure and retain the services of new employees,
and to provide incentives for such persons to exert maximum efforts for the
success of the Company.

         (d)     The Company intends that the rights to purchase stock of the
Company granted under the Plan be considered options issued under an "employee
stock purchase plan" as that term is defined in Section 423(b) of the Code.

2.       ADMINISTRATION.

         (a)     The Plan shall be administered by the Board of Directors (the
"Board") of the Company unless and until the Board delegates administration to
a Committee, as provided in subparagraph 2(c).  Whether or not the Board has
delegated administration, the Board shall have the final power to determine all
questions of policy and expediency that may arise in the administration of the
Plan.

         (b)     The Board shall have the power, subject to, and within the
limitations of, the express provisions of the Plan:

                 (i)      To determine when and how rights to purchase stock of
the Company shall be granted and the provisions of each offering of such rights
(which need not be identical).

                 (ii)     To designate from time to time which Affiliates of
the Company shall be eligible to participate in the Plan.

                 (iii)    To construe and interpret the Plan and rights granted
under it, and to establish, amend and revoke rules and regulations for its
administration.  The Board, in the

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exercise of this power, may correct any defect, omission or inconsistency in
the Plan, in a manner and to the extent it shall deem necessary or expedient to
make the Plan fully effective.

                 (iv)     To amend the Plan as provided in paragraph 13.

                 (v)      Generally, to exercise such powers and to perform
such acts as the Board deems necessary or expedient to promote the best
interests of the Company.

         (c)     The Board may delegate administration of the Plan to a
Committee composed of not fewer than two (2) members of the Board (the
"Committee").  If administration is delegated to a Committee, the Committee
shall have, in connection with the administration of the Plan, the powers
theretofore possessed by the Board, subject, however, to such resolutions, not
inconsistent with the provisions of the Plan, as may be adopted from time to
time by the Board.  The Board may abolish the Committee at any time and revest
in the Board the administration of the Plan.

3.       SHARES SUBJECT TO THE PLAN.

         Subject to the provisions of paragraph 12 relating to adjustments upon
changes in stock, the stock that may be sold pursuant to rights granted under
the Plan shall not exceed in the aggregate six hundred fifty thousand (650,000)
shares of the Company's $0.0001 par value common stock (the "Common Stock").
If any right under the Plan shall for any reason terminate without having been
exercised, the Common Stock not purchased under such right shall again become
available for the Plan.

4.       GRANT OF RIGHTS: OFFERING.

         The Board or the Committee may from time to time grant or provide for
the grant of rights to purchase Common Stock of the Company under the Plan to
eligible employees (an "Offering") on a date or dates (the "Offering Date(s)")
selected by the Board or the Committee.  Each Offering shall be in such form
and shall contain such terms and conditions as the Board or the Committee shall
deem appropriate.  If an employee has more than one right outstanding under the
Plan, unless he or she otherwise indicates in agreements or notices delivered
hereunder (1) each agreement or notice delivered by that employee will be
deemed to apply to all of his or her rights under the Plan, and (2) a right
with a lower exercise price (or an earlier-granted right, if two rights have
identical exercise prices), will be exercised to the fullest possible extent
before a right with a higher exercise price (or a later-granted right, if two
rights have identical exercise prices) will be exercised.  The provisions of
separate Offerings need not be identical, but each Offering shall include
(through incorporation of the provisions of this Plan by reference in the
Offering or otherwise) the substance of the provisions contained in paragraphs
5 through 8, inclusive.

5.       ELIGIBILITY.

         (a)     Rights may be granted only to employees of the Company or, as
the Board or the Committee may designate as provided in subparagraph 2(b), to
employees of any Affiliate of the Company.  Except as provided in subparagraph
5(b), an employee of the Company or any





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Affiliate shall not be eligible to be granted rights under the Plan, unless, on
the Offering Date, such employee has been in the employ of the Company or any
Affiliate for such continuous period preceding such grant as the Board or the
Committee may require, but in no event shall the required period of continuous
employment be equal to or greater than two (2) years.  In addition, unless
otherwise determined by the Board or the Committee and set forth in the terms
of the applicable Offering, no employee of the Company or any Affiliate shall
be eligible to be granted rights under the Plan, unless, on the Offering Date,
such employee's customary employment with the Company or such Affiliate is at
least twenty (20) hours per week and at least five (5) months per calendar
year.

         (b)     The Board or the Committee may provide that, each person who,
during the course of an Offering, first becomes an eligible employee of the
Company or designated Affiliate will, on a date or dates specified in the
Offering which coincides with the day on which such person becomes an eligible
employee or occurs thereafter, receive a right under that Offering, which right
shall thereafter be deemed to be a part of that Offering.  Such right shall
have the same characteristics as any rights originally granted under that
Offering, as described herein, except that:

                 (i)      the date on which such right is granted shall be the
"Offering Date" of such right for all purposes, including determination of the
exercise price of such right;

                 (ii)     the Purchase Period (as defined below) for such right
shall begin on its Offering Date and end coincident with the end of such
Offering; and

                 (iii)      the Board or the Committee may provide that if such
person first becomes an eligible employee within a specified period of time
before the end of the Purchase Period (as defined below) for such Offering, he
or she will not receive any right under that Offering.

         (c)     No employee shall be eligible for the grant of any rights
under the Plan if, immediately after any such rights are granted, such employee
owns stock possessing five percent (5%) or more of the total combined voting
power or value of all classes of stock of the Company or of any Affiliate.  For
purposes of this subparagraph 5(c), the rules of Section 424(d) of the Code
shall apply in determining the stock ownership of any employee, and stock which
such employee may purchase under all outstanding rights and options shall be
treated as stock owned by such employee.

         (d)     An eligible employee may be granted rights under the Plan only
if such rights, together with any other rights granted under "employee stock
purchase plans" of the Company and any Affiliates, as specified by Section
423(b)(8) of the Code, do not permit such employee's rights to purchase stock
of the Company or any Affiliate to accrue at a rate which exceeds twenty-five
thousand dollars ($25,000) of fair market value of such stock (determined at
the time such rights are granted) for each calendar year in which such rights
are outstanding at any time.

6.       RIGHTS: PURCHASE PRICE.

         (a)     On each Offering Date, each eligible employee, pursuant to an
Offering made under the Plan, shall be granted the right to purchase the number
of shares of Common Stock





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of the Company purchasable with up to fifteen percent (15%) (or such lower
percentage as the Board determines for a particular Offering) of such
employee's Earnings (as defined in Section 7(a)) during the period which begins
on the Offering Date (or such later date as the Board determines for a
particular Offering) and ends on the date stated in the Offering, which date
shall be no more than twenty-seven (27) months after the Offering Date (the
Purchase Period").  In connection with each Offering made under this Plan, the
Board or the Committee shall specify a maximum number of shares which may be
purchased by any employee as well as a maximum aggregate number of shares which
may be purchased by all eligible employees pursuant to such Offering.  In
addition, in connection with each Offering which contains more than one
Exercise Date (as defined in the Offering), the Board or the Committee may
specify a maximum aggregate number of shares which may be purchased by all
eligible employees on any given Exercise Date under the Offering.  If the
aggregate purchase of shares upon exercise of rights granted under the Offering
would exceed any such maximum aggregate number, the Board or the Committee
shall make a pro rata allocation of the shares available in as nearly a uniform
manner as shall be practicable and as it shall deem to be equitable.

         (b)     The purchase price of stock acquired pursuant to rights
granted under the Plan shall be not less than the lesser of:

                 (i)      an amount equal to eighty-five percent (85%) of the
fair market value of the stock on the Offering Date; or

                 (ii)     an amount equal to eighty-five percent (85%) of the
fair market value of the stock on the Exercise Date.

7.       PARTICIPATION: WITHDRAWAL: TERMINATION.

         (a)     An eligible employee may become a participant in an Offering
by delivering a participation agreement to the Company within the time
specified in the Offering, in such form as the Company provides.  Each such
agreement shall authorize payroll deductions of up to fifteen percent (15%) (or
such lower percentage as the Board determines for a particular Offering) of
such employee's Earnings during the Purchase Period.  "Earnings" is defined as
an employee's total compensation, including all salary, wages and other
remuneration paid to an employee (including amounts elected to be deferred by
the employee, that would otherwise have been paid, under any cash or deferred
arrangement established by the Company), overtime pay, commissions, bonuses,
profit sharing, any special payments for extraordinary services, provided,
however, that the Board in its sole discretion may limit the above definition
from time to time with respect to each Offering.  The payroll deductions made
for each participant shall be credited to an account for such participant under
the Plan and shall be deposited with the general funds of the Company.  A
participant may reduce, increase or begin such payroll deductions after the
beginning of any Purchase Period only as provided for in the Offering.  A
participant may make additional payments into his or her account only if
specifically provided for in the Offering and only if the participant has not
had the maximum amount withheld during the Purchase Period.

         (b)     At any time during a Purchase Period a participant may
terminate his or her payroll deductions under the Plan and withdraw from the
Offering by delivering to the Company





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a notice of withdrawal in such form as the Company provides.  Such withdrawal
may be elected at any time prior to the end of the Purchase Period.  Upon such
withdrawal from the Offering by a participant, the Company shall distribute to
such participant all of his or her accumulated payroll deductions (reduced to
the extent, if any, such deductions have been used to acquire stock for the
participant) under the Offering, without interest unless the terms of the
Offering specifically so provide, and such participant's interest in that
Offering shall be automatically terminated.  A participant's withdrawal from an
Offering will have no effect upon such participant's eligibility to participate
in any other Offerings under the Plan but such participant will be required to
deliver a new participation agreement in order to participate in subsequent
Offerings under the Plan.

         (c)     Rights granted pursuant to any Offering under the Plan shall
terminate immediately upon cessation of any participating employee's employment
with the Company or an Affiliate, for any reason, and the Company shall
distribute to such terminated employee all of his or her accumulated payroll
deductions (reduced to the extent, if any, such deductions have been used to
acquire stock for the terminated employee), under the Offering, without
interest unless the terms of the Offering specifically so provide.

         (d)     Rights granted under the Plan shall not be transferable, and
shall be exercisable only by the person to whom such rights are granted.

8.       EXERCISE.

         (a)     On each exercise date as defined in the relevant Offering (an
"Exercise Date"), each participant's accumulated payroll deductions (without
any increase for interest unless the terms of the Offering specifically so
provide) will be applied to the purchase of whole shares of stock of the
Company, up to the maximum number of shares permitted pursuant to the terms of
the Plan and the applicable Offering, at the purchase price specified in the
Offering.  No fractional shares shall be issued upon the exercise of rights
granted under the Plan.  The amount, if any, of accumulated payroll deductions
remaining in each participant's account after the purchase of shares which is
less than the amount required to purchase one share of stock on the final
Exercise Date of an Offering shall be held in each such participant's account
for the purchase of shares under the next Offering under the Plan, unless such
participant withdraws from such next Offering, as provided in subparagraph
7(b), or is no longer eligible to be granted rights under the Plan, as provided
in paragraph 5, in which case such amount shall be distributed to the
participant after said final Exercise Date, without interest unless the terms
of the Offering specifically so provide.  The amount, if any, of accumulated
payroll deductions remaining in any participant's account after the purchase of
shares which is equal to the amount required to purchase whole shares of stock
on the final Exercise Date of an Offering shall be distributed in full to the
participant after such Exercise Date, without interest unless the terms of the
Offering specifically so provide.

         (b)     No rights granted under the Plan may be exercised to any
extent unless the Plan (including rights granted thereunder) is covered by an
effective registration statement pursuant to the Securities Act of 1933, as
amended (the "Securities Act").  If on an Exercise Date of any Offering
hereunder the Plan is not so registered, no rights granted under the Plan or
any Offering shall be exercised on said Exercise Date and all payroll
deductions accumulated during





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the purchase period (reduced to the extent, if any, such deductions have been
used to acquire stock) shall be distributed to the participants, without
interest unless the terms of the Offering specifically so provide.

9.       COVENANTS OF THE COMPANY.

         (a)     During the terms of the rights granted under the Plan, the
Company shall keep available at all times the number of shares of stock
required to satisfy such rights.

         (b)     The Company shall seek to obtain from each regulatory
commission or agency having jurisdiction over the Plan such authority as may be
required to issue and sell shares of stock upon exercise of the rights granted
under the Plan.  If, after reasonable efforts, the Company is unable to obtain
from any such regulatory commission or agency the authority which counsel for
the Company deems necessary for the lawful issuance and sale of stock under the
Plan, the Company shall be relieved from any liability for failure to issue and
sell stock upon exercise of such rights unless and until such authority is
obtained.

10.      USE OF PROCEEDS FROM STOCK.

         Proceeds from the sale of stock pursuant to rights granted under the
Plan shall constitute general funds of the Company.

11.      RIGHTS AS A STOCKHOLDER.

         A participant shall not be deemed to be the holder of, or to have any
of the rights of a holder with respect to, any shares subject to rights granted
under the Plan unless and until certificates representing such shares shall
have been issued.

12.      ADJUSTMENTS UPON CHANGES IN STOCK.

         (a)     If any change is made in the stock subject to the Plan, or
subject to any rights granted under the Plan (through merger, consolidation,
reorganization, recapitalization, stock dividend, dividend in property other
than cash, stock split, liquidating dividend, combination of shares, exchange
of shares, change in corporate structure or otherwise), the Plan and
outstanding rights will be appropriately adjusted in the class(es) and maximum
number of shares subject to the Plan and the class(es) and number of shares and
price per share of stock subject to outstanding rights.

         (b)     In the event of: (1) a dissolution or liquidation of the
Company; (2) a merger or consolidation in which the Company is not the
surviving corporation; (3) a reverse merger in which the Company is the
surviving corporation but the shares of the Company's Common Stock outstanding
immediately preceding the merger are converted by virtue of the merger into
other property, whether in the form of securities, cash or otherwise; or (4)
any other capital reorganization in which more than fifty percent (50%) of the
shares of the Company entitled to vote are exchanged, then, as determined by
the Board in its sole discretion (i) any surviving corporation may assume
outstanding rights or substitute similar rights for those under the Plan, (ii)
such rights may continue in full force and effect, or (iii) participants'
accumulated payroll





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deductions may be used to purchase Common Stock immediately prior to the
transaction described above and the participants' rights under the ongoing
Offering terminated.

13.      AMENDMENT OF THE PLAN.

         (a)     The Board at any time, and from time to time, may amend the
Plan.  However, except as provided in paragraph 12 relating to adjustments upon
changes in stock, no amendment shall be effective if such modification requires
stockholder approval in order for the Plan to obtain employee stock purchase
plan treatment under Section 423 of the Code or to comply with the requirements
of Rule 16b-3 promulgated under the Exchange Act or any Nasdaq or securities
exchange listing requirements.  It is expressly contemplated that the Board may
amend the Plan in any respect the Board deems necessary or advisable to provide
eligible employees with the maximum benefits provided or to be provided under
the provisions of the Code and the regulations promulgated thereunder relating
to employee stock purchase plans and/or to bring the Plan and/or rights granted
under it into compliance therewith.

         (b)     Rights and obligations under any rights granted before
amendment of the Plan shall not be altered or impaired by any amendment of the
Plan, except with the consent of the person to whom such rights were granted.

14.      TERMINATION OR SUSPENSION OF THE PLAN.

         (a)     The Board may suspend or terminate the Plan at any time.
Unless sooner terminated, the Plan shall terminate ten (10) years from the date
the Plan is adopted by the Board or approved by the stockholders of the
Company, whichever is earlier.  No rights may be granted under the Plan while
the Plan is suspended or after it is terminated.

         (b)     Rights and obligations under any rights granted while the Plan
is in effect shall not be altered or impaired by suspension or termination of
the Plan, except with the consent of the person to whom such rights were
granted.

15.      EFFECTIVE DATE OF PLAN.

         The Plan shall become effective as determined by the Board, but no
rights granted under the Plan shall be exercised unless and until the Plan has
been approved by the stockholders of the Company.





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