Exhibit 10.19

                                    AyurCore, Inc.
                                   PROMISSORY NOTE
                                           

                                                               January 29, 1996

         FOR VALUE RECEIVED, AyurCore, Inc., a Delaware corporation
("Borrower"), promises to pay Irwin Rosenthal, ("Lender") the principal amount
of $25,000, together with interest on the unpaid balance thereof from the date
of this Promissory Note to the date such balance is paid, at the prime rate
shown in the Western Edition of the Wall Street Journal, plus 2% per annum. 
Interest shall be due and payable on June 30 and December 31, of each year. 
Principal shall be due on demand commencing one year from the date hereof;
provided, however, that if, after the date of this Promissory Note, Borrower
shall concluded a debt or equity financing, of $500,00 or more, the unpaid
principal and accrued interest hereunder shall be payable on the fifth business
day after the closing of such financing.

If any one or more of the following events ("Events of Default") shall occur:

    a.   Borrower shall fail to pay any amount under this Promissory Note when
    the same shall become due and payable, whether at maturity or by
    acceleration or otherwise; or

    b.   (i)  the Borrower shall commence any action (A) under any law relating
    to bankruptcy, insolvency, reorganization or relief of debtors, seeking to
    have an order for relief entered with respect to the Borrower or its debts
    or (B) seeking appointment of custodian, receiver or similar office for the
    Borrower or any substantial part o its property; or (ii) any action of a
    nature referred to above shall commenced against the Borrower and results
    in an order for relief or is not dismissed, discharged or fully bonded
    within 30 day; or (iii) there shall be commenced against the Borrower any
    action seeking attachment, execution or similar process against any
    substantial part of the Borrower's property, which action is not within 30
    days discharged or stayed or fully bonded; or (iv) the Borrower shall, by
    act or omission, indicate its consent to or acquiescence in any of the
    foregoing, without regard to the grace periods set forth above; or (v) the
    Borrower shall be unable, or admit in writing inability, to pay the
    Borrower's debts as they become due; or (vi) the Borrower shall transfer or
    conceal its property within intent to hinder, delay or defraud any
    creditors or to benefit any class of creditors or creditors generally or
    shall suffer for 30 days or longer while insolvent any lien on the
    Borrower's property resulting from judicial proceedings; or

    c.   the dissolution or other winding up of the Borrower; then, in such
    event and at any time thereafter, if such event shall then be continuing,
    Lender may, at its option upon written notice to Borrower, declare this
    Promissory Note to be due and payable, whereupon (or without the necessity
    for such notice in the case of any event described in clause (i) or (ii) of
    paragraph (b) above, the entire balance of this Promissory Note shall
    forthwith become and be due and payable.




    Except as otherwise hereinabove expressly provided, Borrower hereby waives
diligence, demand, protest, presentment and all notices (whether of nonpayment,
dishonor, protest, acceleration or otherwise) and consents to acceleration of
the time of payment and to surrender, substitution or any other action or
inaction with respect to security and to forbearance and to other indulgence,
all without notice.  Failure of Lender to assert any right herein shall not be
deemed  a waiver thereof.

    The Borrower shall have the right, at any time, to prepay without penalty
all of this Promissory Note together with accrued interest thereon.

    Lender shall not assign its rights hereunder without the prior written
consent of Borrower.

    This Promissory Note shall be governed by and construed in  accordance with
the laws of the State of New York applicable to contracts made and to be
performed wholly within such State.

    IN WITNESS WHEREOF, the Borrower has signed this Promissory Note as of the
date first written above.

                                  AyurCore, Inc.



                                  By: /s/ Andrew Ganes
                                     -------------------------------
                                            Authorized Signature



                                                      May 26, 1998



Deepa Chitre
Chief Executive Officer
AyurCore, Inc.
1737 N. First Street, Suite 290
San Jose, California 95112

Dear Mrs. Chitre:

     Reference is hereby made to that certain Promissory Note, dated as of 
January 29, 1996, made by AyurCore, Inc. ("AyurCore") in favor of Irwin M. 
Rosenthal (the "Note"). In order to facilitate AyurCore's contemplated initial 
public offering (the "Offering"), the undersigned hereby agrees that no 
payments shall be due or payable under the Note prior to the first 
anniversary of the consummation of the Offering; provided, however, that this 
agreement shall be of no further force or effect if the Offering shall not be 
consummated by August 1, 1998.


                                       /s/Irwin M. Rosenthal
                                          -------------------------
                                          Irwin M. Rosenthal