Exhibit 4f

         THE  SECURITY  REPRESENTED  HEREBY  HAS NOT BEEN  REGISTERED  UNDER THE
SECURITIES ACT OF 1933, AS AMENDED,  OR APPLICABLE  STATE  SECURITIES LAWS. THIS
SECURITY  MAY  NOT  BE  SOLD,  ASSIGNED  OR  TRANSFERRED  WITHOUT  AN  EFFECTIVE
REGISTRATION  STATEMENT FOR SUCH SECURITY  UNDER THE  SECURITIES ACT OF 1933, AS
AMENDED,  OR APPLICABLE STATE  SECURITIES LAWS,  UNLESS THE COMPANY HAS RECEIVED
THE  WRITTEN  OPINION OF COUNSEL  SATISFACTORY  TO THE  COMPANY  THAT SUCH SALE,
ASSIGNMENT OR TRANSFER DOES NOT INVOLVE A TRANSACTION REQUIRING  REGISTRATION OF
SUCH SECURITY UNDER THE SECURITIES ACT OF 1933, AS AMENDED,  OR APPLICABLE STATE
SECURITIES LAWS.


WARRANT NO.:  W-CS-26                  RIGHT TO PURCHASE 250,000
AUGUST 21, 1997                        SHARES OF COMMON STOCK OF DYNAGEN, INC.

                  VOID UNLESS EXERCISED BEFORE AUGUST 21, 2000


                                  DYNAGEN, INC.

                          COMMON STOCK PURCHASE WARRANT


         DYNAGEN, INC., a Delaware corporation (the "COMPANY"), hereby certifies
that, in  consideration  of the  investment by Endeavour  Capital Fund S.A. (the
"HOLDER")  pursuant to the Stock Purchase  Agreement dated the date hereof,  the
Holder is entitled, subject to and in accordance with the terms set forth below,
to purchase from the Company, commencing on the date hereof, at any time or from
time to time before 5:00 P.M. Eastern Standard Time on August 21, 2000,  250,000
fully paid and  non-assessable  shares of Common Stock,  $.01 par value,  of the
Company,  at an exercise price per share of $0.74609 (the "EXERCISE PRICE") (one
hundred  twenty-five  percent  (125%) of the average of the closing bid price of
the Common  Stock of the Company as reported by the Nasdaq  SmallCap  Market for
the ten (10) trading days immediately preceding the date hereof). The number and
character of such shares of Common  Stock and the Exercise  Price are subject to
adjustment as provided herein.

         As used  herein  the  following  terms,  unless the  context  otherwise
requires, have the following respective meanings:

         (a) The term "COMPANY" means DynaGen, Inc., a Delaware corporation, and
any  corporation  that  succeeds  or  assumes  the  obligations  of the  Company
hereunder.

         (b) The term "COMMON STOCK" means (a) the Company's Common Stock,  $.01
par value per share, as authorized,  (b) any other capital stock of any class or
classes (however  designated) of the Company,  authorized on or after such date,
the  holders of which  shall have the right,  without  limitation  as to amount,
either to all or to a share of the balance of current  dividends and liquidating
dividends  after the  payment  of  dividends  and  distributions  on any  shares
entitled  to  preference,  and the  holders of which  shall  ordinarily,  in the
absence of contingencies,  be entitled to



                                      -2-


vote for the election of a majority of directors of the Company (even though the
right so to vote has been suspended by the happening of such a contingency), (c)
any other securities into which or for which any of the securities  described in
(a) or (b) may be converted or exchanged pursuant to a plan of recapitalization,
reorganization,  merger,  sale of  assets or  otherwise,  or the  conversion  of
promissory notes or other obligations of the Company.

         (c) The term  "OTHER  SECURITIES"  means any stock  (other  than Common
Stock) and other  securities  of the Company or any other person  (corporate  or
otherwise)  which the holder of this  Warrant at any time shall be  entitled  to
receive,  or shall have received,  on the exercise of the Warrant, in lieu of or
in  addition  to Common  Stock,  or which at any time shall be issuable or shall
have been  issued in exchange  for or in  replacement  of Common  Stock or Other
Securities pursuant to Sections 3 or 4 or otherwise.

         1.       EXERCISE OF WARRANT.

                  1.1. FULL  EXERCISE.  This Warrant may be exercised in full by
the holder  hereof by surrender of this Warrant,  with the form of  subscription
attached  hereto duly  executed by such holder,  to the Company at its principal
office,  accompanied by payment,  in cash or by certified or official bank check
payable to the order of the Company,  in the amount  obtained by multiplying the
number of shares of Common Stock for which this Warrant is then  exercisable  by
the Exercise Price then in effect.

                  1.2. PARTIAL  EXERCISE.  This Warrant may be exercised in part
by surrender of this Warrant in the manner and at the place  provided in Section
1.1 except that the amount payable by the holder on such partial  exercise shall
be the amount  obtained by multiplying  (a) the number of shares of Common Stock
designated  by the  holder  in the  subscription  at the end  hereof  by (b) the
Exercise Price then in effect. On any such partial exercise,  the Company at its
expense  will  forthwith  issue and  deliver  to or upon the order of the holder
hereof a new Warrant or Warrants of like tenor, in the name of the holder hereof
or as such holder (upon payment by such holder of any applicable transfer taxes)
may  request,  calling in the  aggregate  on the face or faces  thereof  for the
number of shares of Common Stock for which such Warrant or Warrants may still be
exercised.

                  1.3 CASHLESS EXERCISE FEATURE -- RIGHT TO CONVERT WARRANT INTO
COMMON STOCK.  (a) In addition to and without  limiting the rights of the holder
hereof  under the terms of this  Warrant,  the holder  shall have the right (the
"CONVERSION  RIGHT") to convert this Warrant or any portion  thereof into shares
of Common  Stock as  provided  in this  Section at any time or from time to time
prior to its expiration,  subject to the restrictions set forth in paragraph (c)
hereof.  In lieu of  exercising  this warrant for cash,  the holder may elect to
surrender  this  warrant for  conversion  and to receive  shares of Common Stock
equal to the value of this Warrant (or the portion being cancelled,  surrendered
and converted) by surrender of this Warrant to the Company  together with notice
of such  election.  Upon such  event,  the  Company  shall issue to the holder a
number of shares of the Company's  Common Stock  computed by using the following
formula:

                                    X  EQUALS Y (A MINUS B)
                                              -------------
                                                    A






                                      -3-


Where:            X = The  number of shares of Common  Stock to be issued to the
                      holder;
                  Y = The number of shares of Common Stock  exercisable
                      under this  Warrant
                  A = The "Fair Market Value" of one share
                      of the Common Stock on the Conversion Date (as defined
                      below); and
                  B = The Exercise Price of the Warrant (as adjusted to the date
                      of the calculation).

         Upon  exercise of the  Conversion  Right with  respect to a  particular
number of shares  subject to this  Warrant,  the  Company  shall  deliver to the
holder, without payment by the holder of any exercise price or any cash or other
consideration,  that  number  of  shares of  Common  Stock  equal to the  number
computed  using the above formula.  Notwithstanding  anything in this Section to
the contrary,  the Conversion Right cannot be exercised with respect to a number
of Converted  Warrant Shares having a value below $1,000.  No fractional  shares
shall be issuable upon exercised of the Conversion  Right,  and if the number of
shares to be issued in  accordance  with the  foregoing  formula is other than a
whole number, the Company shall pay to the holder an amount in cash equal to the
Fair Market Value of the resulting fractional share.

         (b)  The  Conversion  Right  may  be  exercised  by the  holder  by the
surrender of this Warrant at the principal office of the Company together with a
written  statement  specifying  that the holder thereby  intends to exercise the
Conversion  Right and  indicating  the  number  of  shares  of  Common  Stock or
authorized  Common Stock subject to this Warrant which are being  surrendered in
exercise of the  Conversion  Right.  Such  conversion  shall be  effective  upon
receipt by the  Company of this  Warrant  together  with the  aforesaid  written
statement,  or on such  later  date as is  specified  therein  (the  "CONVERSION
DATE"), but not later than the expiration date of this Warrant.

         (c) In the event the Conversion  Right would,  at any time this Warrant
remains  outstanding,  be deemed by the Company's  independent  certified public
accountants  to give rise to a charge to the  Company's  earnings for  financial
reporting purposes, then the Conversion Right shall automatically terminate upon
the Company's written notice to the holder of such adverse accounting treatment.

         (d) For purposes of this Section, the "FAIR MARKET VALUE" of a share of
Common Stock or authorized Common Stock as of a particular Conversion Date shall
mean:

                  (i) if the  Company's  Common  Stock  is  then  traded  on any
nationally-recognized  stock  exchange or quoted on the Nasdaq  National  Market
System or  SmallCap  Market,  the  average of the  closing bid prices for the 25
trading days  preceding  the  Conversion  Date,  as reported by such exchange or
system,  as  reported  in The Wall  Street  Journal  or any  other  publication,
including the NASD;

                  (ii) if the  Company's  Common  Stock  is then  traded  on the
over-the-counter market, the average of the closing bid and closing asked prices
for the 30 trading days preceding the  Conversion  Date, as reported in The Wall
Street Journal or by any market maker; or



                                      -4-

                  (iii)  if  quotations  for  the  Company's   Common  Stock  or
authorized  Common  Stock are not readily  available as set forth in (i) or (ii)
above, then as determined in good faith by the Company's Board of Directors upon
a review of all relevant factors,  including,  without limitation,  the price at
which  shares of the  Company's  Common Stock or  authorized  Common Stock could
reasonably be expected to be sold in an arms-length transaction, for cash, other
than on an  installment  basis,  to a person not employed by,  controlled by, in
control of or under common control with the Company,  which determination by the
Board of Directors shall give due consideration to recent transactions involving
shares of the Common Stock or  authorized  Common  Stock,  if any,  revenues and
earnings of the Company to the date of such  determination  (if any),  projected
revenues and earnings of the Company, the effect of the transfer restrictions to
which the shares are subject  under law, the absence of a public  market for the
Common Stock or authorized  Common Stock, and such other matters as the Board of
Directors deems pertinent. Such determination by the Board of Directors shall be
conclusive and binding.

         2. DELIVERY OF STOCK  CERTIFICATES ON EXERCISE.  As soon as practicable
after the exercise of this  Warrant in full or in part,  and in any event within
three (3) trading days after each Conversion Date or after the Company  receives
(i) the original  Form of  Subscription  properly  completed,  (ii) the original
Warrant and (iii) payment pursuant to Section 1.1 above, as the case may be, the
Company at its  expense  (including  the payment by it of any  applicable  issue
taxes)  will  cause to be  issued  in the name of and  delivered  to the  holder
hereof,  or as such  holder  (upon  payment  by such  holder  of any  applicable
transfer  taxes) may direct,  a certificate  or  certificates  for the number of
fully paid and  non-assessable  shares of Common Stock (or Other  Securities) to
which such  holder  shall be  entitled on such  exercise,  plus,  in lieu of any
fractional share to which such holder would otherwise be entitled, cash equal to
such fraction multiplied by the then current market value of one full share. The
exercise  date of this Warrant  shall be the date on which the Company  receives
the properly  completed Form of  Subscription  attached  hereto by telecopier or
otherwise.

         3.       ADJUSTMENT FOR REORGANIZATION, CONSOLIDATION OR MERGER.

                  3.1.  REORGANIZATION,  CONSOLIDATION OR MERGER. In case at any
time or from time to time,  the Company shall (a) effect a  reorganization,  (b)
consolidate  with or merge into any other person or entity,  or (c) transfer all
or  substantially  all of its capital  stock,  properties or assets to any other
person  under  any plan or  arrangement  contemplating  the  dissolution  of the
Company,  then, in each such case,  the holder of this Warrant,  on the exercise
hereof as  provided  in  Section 1 at any time  after the  consummation  of such
reorganization,   consolidation   or  merger  or  the  effective  date  of  such
dissolution,  as the case may be,  shall  receive,  upon the proper and rightful
exercise  of this  Warrant,  in lieu of the Common  Stock (or Other  Securities)
issuable on such exercise prior to such consummation or such effective date, the
stock and other  securities and property  (including  cash) to which such holder
would have been  entitled  upon such  consummation  or in  connection  with such
dissolution,  as the case may be, if such holder had so exercised  this Warrant,
immediately  prior  thereto,  all subject to further  adjustment  thereafter  as
provided in Sections 4 and 5.

                  3.2.  CONTINUATION OF TERMS. Upon any corporate event referred
to in this Section 3, this Warrant  shall  continue in full force and effect and
the terms hereof shall be



                                      -5-

applicable to the shares of stock and Other  Securities and property  receivable
on the exercise of this Warrant after the  consummation of such  reorganization,
consolidation  or  merger,  as the case may be,  and shall be  binding  upon the
issuer of any such stock or other securities.

         4. ADJUSTMENTS FOR STOCK DIVIDENDS AND STOCK SPLITS.  In the event that
the Company shall (i) issue additional  shares of the Common Stock as a dividend
or  other   distribution  on  outstanding   Common  Stock,  (ii)  subdivide  its
outstanding  shares of Common Stock, or (iii) combine its outstanding  shares of
the Common Stock into a smaller  number of shares of the Common Stock,  then, in
each such event, the Exercise Price shall,  simultaneously with the happening of
such event, be adjusted by multiplying  the then prevailing  Exercise Price by a
fraction,  the  numerator of which shall be the number of shares of Common Stock
outstanding  immediately prior to such event (calculated assuming the conversion
or exchange of all outstanding shares of convertible or exchangeable  securities
of the Company which are convertible or exchangeable  into, or exercisable  for,
shares of Common  Stock)  and the  denominator  of which  shall be the number of
shares of Common  Stock  outstanding  immediately  after such event  (calculated
assuming the conversion or exchange of all outstanding  shares of convertible or
exchangeable  securities of the Company which are  convertible  or  exchangeable
into, or  exercisable  for,  shares of Common Stock) and the product so obtained
shall thereafter be the Exercise Price then in effect. The Exercise Price, as so
adjusted,  shall be  readjusted  in the same  manner upon the  happening  of any
successive  event or events  described  herein in this  Section 4. The holder of
this Warrant shall thereafter,  on the exercise hereof as provided in Section 1,
be  entitled  to receive  that number of shares of Common  Stock  determined  by
multiplying  the number of shares of Common Stock which would otherwise (but for
the provisions of this Section 4) be issuable on such exercise, by a fraction of
which (i) the numerator is the Exercise Price which would otherwise (but for the
provisions  of this  Section 4) be in effect,  and (ii) the  denominator  is the
Exercise Price in effect on the date of such exercise.

         5.   ADJUSTMENT   FOR   DIVIDENDS   IN  OTHER   STOCK,   PROPERTY   AND
RECLASSIFICATIONS.  In case at any time or from  time to time,  the  holders  of
Common  Stock (or Other  Securities)  shall have  received,  or (on or after the
record date fixed for the  determination  of  stockholders  eligible to receive)
shall have become entitled to receive, without payment therefor,

                  (a) other or additional  stock or other securities or property
(other than cash) by way of dividend, or

                  (b) other or additional  stock or other securities or property
(including   cash)   by   way   of   spin-off,    split-up,    reclassification,
recapitalization, combination of shares or similar corporate rearrangement,

other than additional shares of Common Stock (or Other  Securities)  issued as a
stock dividend or in a stock-split (adjustments in respect of which, in the case
of Common Stock,  are provided for in Section 4), then and in each such case the
holder of this Warrant,  on the exercise  hereof as provided in Section 1, shall
be  entitled  to  receive  the  amount  of other or  additional  stock and other
securities and property  (including cash in the cases referred to in subdivision
(b) of this Section 5) which such holder would hold on the date of such exercise
if on the  date of  distribution  of such  other  or



                                      -6-

additional stock or other  securities and property,  or on the record date fixed
for  determining the  shareholders  entitled to receive such other or additional
stock or other  securities  and  property,  such  holder  had been the holder of
record of the  number of shares of Common  Stock  called for on the face of this
Warrant  and had  thereafter,  during  the period  from the date  thereof to and
including the date of such exercise,  retained such shares and all such other or
additional stock and other securities and property  (including cash in the cases
referred to in  subdivision  (b) of this Section 5) receivable by such holder as
aforesaid during such period, giving effect to all adjustments called for during
such period by Sections 3 and 4.

         6.       NOTICES OF RECORD DATE.  In the event of

                  (a) any taking by the  Company  of a record of the  holders of
any class or securities for the purpose of determining  the holders  thereof who
are  entitled to receive any  dividend  or other  distribution,  or any right to
subscribe for, purchase or otherwise acquire any shares of stock of any class or
any other securities or property, or to receive any other right, or

                  (b)  any   capital   reorganization   of  the   Company,   any
reclassification  or recapitalization of the capital stock of the Company or any
transfer  of  all  or  substantially  all  the  assets  of  the  Company  to  or
consolidation or merger of the Company with or into any other person, or

                  (c) any voluntary or involuntary  dissolution,  liquidation or
winding-up of the Company,

then and in each such event the  Company  will mail or cause to be mailed to the
holder of this Warrant a notice specifying (i) the date on which any such record
is to be taken for the  purpose of such  dividend,  distribution  or right,  and
stating the amount and character of such dividend,  distribution  or right,  and
(ii)   the   date  on   which   any   such   reorganization,   reclassification,
recapitalization,  transfer, consolidation,  merger, dissolution, liquidation or
winding-up is to take place,  and the time,  if any is to be fixed,  as of which
the holders of record of Common Stock (or Other Securities) shall be entitled to
exchange  their shares of Common Stock (or Other  Securities)  for securities or
other   property   deliverable   on   such   reorganization,   reclassification,
recapitalization,  transfer, consolidation,  merger, dissolution, liquidation or
winding-up.  Such notice  shall be mailed at least twenty (20) days prior to the
date specified in such notice on which any such action is to be taken.

         7.  RESERVATION OF STOCK  ISSUABLE ON EXERCISE OF WARRANT.  The Company
will at all times reserve and keep  available,  solely for issuance and delivery
on the  exercise of the  Warrant,  all shares of Common  Stock from time to time
issuable on the exercise of all of the then outstanding Warrants, and the shares
of Common Stock which the holder of this Warrant  shall receive upon exercise of
the  Warrant  will  be  duly   authorized,   validly  issued,   fully  paid  and
non-assessable.

         8.  EXCHANGE OF WARRANT.  On surrender  for  exchange of this  Warrant,
properly  endorsed,  to the  Company,  the Company at its expense will issue and
deliver to or on the order of



                                      -7-


the holder thereof a new Warrant or Warrants of like tenor,  in the name of such
holder or as such holder (on payment by such holder of any  applicable  transfer
taxes) may direct, calling in the aggregate on the face or faces thereof for the
number of shares of Common  Stock called for on the face or faces of the Warrant
or Warrants so surrendered.

         9.   REPLACEMENT  OF  WARRANT.   On  receipt  of  evidence   reasonably
satisfactory  to the Company of the loss,  theft,  destruction  or mutilation of
this Warrant  and, in the case of any such loss,  theft or  destruction  of this
Warrant,   on  delivery  of  an  indemnity   agreement  or  security  reasonably
satisfactory  in form and  amount  to the  Company  or,  in the case of any such
mutilation,  on surrender and  cancellation of such Warrant,  the Company at its
expense will execute and deliver, in lieu thereof, a new Warrant of like tenor.

         10.  WARRANTHOLDER  NOT DEEMED  STOCKHOLDER;  RESTRICTIONS ON TRANSFER.
This Warrant is issued upon the following  terms, to all of which each holder or
owner hereof by the taking hereof consents and agrees:

                  (a) Except as otherwise  expressly  set forth in Sections 3, 4
and 5 with respect to computing  adjustments  with respect hereto,  no holder of
this Warrant  shall,  as such,  be deemed the holder of Common Stock that may at
any time be issuable upon  exercise of this Warrant for any purpose  whatsoever,
nor shall anything  contained herein be construed to confer upon such holder, as
such,  any of the rights of a stockholder of the Company until such holder shall
have  delivered  formal  notice to the Company of an intention to exercise  this
Warrant, tendered promptly the consideration required for exercise (whether cash
or securities), exercised the Warrant, and been issued shares of Common Stock in
accordance with the provisions hereof.

                  (b) This  Warrant is not  transferable  or  assignable  to any
party other than an affiliate of the Holder without the prior written consent of
the  Company.  A holder that wishes to  transfer  or assign this  Warrant  shall
provide to the Company an opinion of counsel  satisfactory  to the Company  that
such transfer is permissible under applicable law.

         11.  REGISTRATION  RIGHTS.  The Company  shall  register  the shares of
Common Stock issuable upon exercise of this Warrant in accordance with the terms
of the Registration Rights Agreement dated as of the date hereof.

         12. NOTICES.  All notices and other  communications from the Company to
the  holder of this  Warrant  shall be sent by (i)  first  class  mail,  postage
prepaid,  (ii) electronic  facsimile  transmission,  or (iii) express  overnight
courier service,  at such address or facsimile number as may have been furnished
to the Company in writing by such holder or, until any such holder  furnishes to
the  Company an  address or  facsimile  number,  then to, and at the  address or
facsimile  number of, the last holder of this  Warrant who has so  furnished  an
address to the Company.

         13.  MISCELLANEOUS.  This  Warrant  and any term hereof may be changed,
waived,  discharged or terminated only by an instrument in writing signed by the
party against which enforcement of such change, waiver, discharge or termination
is sought.  This Warrant and the shares of Common Stock  underlying this Warrant
shall be construed and enforced in  accordance



                                      -8-

with and  governed  by the laws of the  State of  Delaware.  The  invalidity  or
unenforceability  of any provision hereof shall in no way affect the validity or
enforceability of any other provision.

                [REMAINDER OF PAGE IS INTENTIONALLY LEFT BLANK.]






                                      -9-


Dated: August 21, 1997                      DYNAGEN, INC.

ATTEST:

By:    /s/ Dennis R. Bilodeau               By:     /s/ Dhananjay G. Wadekar
   ----------------------------                ---------------------------------

Title: Controller                           Title:  Executive Vice President
      -------------------------                   ------------------------------







                              FORM OF SUBSCRIPTION
                   (TO BE SIGNED ONLY ON EXERCISE OF WARRANT)


TO DynaGen, Inc.

         The undersigned,  the holder of the within Warrant,  hereby irrevocably
elects to exercise this Warrant for, and to purchase thereunder, ........ shares
of Common Stock of DynaGen,  Inc., a Delaware  corporation,  and herewith  makes
payment of $........  therefor,  and  requests  that the  certificates  for such
shares be issued in the name of, and delivered to ..............,  whose address
is ................................

Dated:
                                                   (Signature  must  conform  to
                                                   name of holder  as  specified
                                                   on the face of the Warrant)


                                                   (Address)

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

                               FORM OF ASSIGNMENT
                   (TO BE SIGNED ONLY ON TRANSFER OF WARRANT)


         For  value  received,   the  undersigned  hereby  sells,  assigns,  and
transfers unto .................. the right represented by the within Warrant to
purchase  .............  shares of Common  Stock of  DynaGen,  Inc.,  a Delaware
corporation,    to   which   the   within   Warrant   relates,    and   appoints
 ..........................  Attorney  to  transfer  such  right on the  books of
DynaGen,  Inc., a Delaware  corporation,  with full power of substitution in the
premises.


Dated:

                                                   (Signature  must  conform  to
                                                   name of holder  as  specified
                                                   on the face of the Warrant)


                                                   (Address)

Signed in the presence of: