COMBICHEM INC
SC 13G, 1999-02-11
COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH
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                                  SCHEDULE 13G

             INFORMATION STATEMENT PURSUANT TO RULES 13d-1 AND 13d-2
                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                             (Amendment No. ______)*

                                 COMBICHEM, INC.
                               ------------------
                                (Name of Issuer)

                                  COMMON STOCK
                                     ------
                         (Title of Class of Securities)

                                   20009P-10-3
                                    ---------
                                 (CUSIP Number)



*The  remainder of this cover page shall be filled out for a reporting  person's
initial filing on this form with respect to the subject class of securities, and
for any  subsequent  amendment  containing  information  which  would  alter the
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be "filed" for the purpose of Section 18 of the  Securities  Exchange  Act of
1934 ("Act") or otherwise  subject to the liabilities of that section of the Act
but shall be subject to all other provisions of the Act (however, see the Notes)

                               Page 1 of 16 Pages
<PAGE>

<TABLE>
<CAPTION>

<S>                                                                  <C>                  <C>
- -----------------------------------------------------                                     -----------------------------------------
CUSIP No. 20009P-10-3                                                 13G                                Page 2 of 16 Pages
- -----------------------------------------------------                                     -----------------------------------------

- ------------- ---------------------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSONS
              S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

              SEQUOIA CAPITAL VI        94-3166265
- ------------- ---------------------------------------------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                               (a)     [ ]
                                                                                              (b)     [X] 
- ------------- ---------------------------------------------------------------------------------------------------------------------
     3        SEC USE ONLY


- ------------- ---------------------------------------------------------------------------------------------------------------------
     4        CITIZENSHIP OR PLACE OF ORGANIZATION

              CALIFORNIA
- ---------------------------- ------- ----------------------------------------------------------------------------------------------
     NUMBER OF SHARES          5     SOLE VOTING POWER
BENEFICIALLY OWNED BY EACH
   REPORTING PERSON WITH                NONE
                             ------- ----------------------------------------------------------------------------------------------
                               6     SHARED VOTING POWER
                                     
                                        1,126,575
                             ------- ----------------------------------------------------------------------------------------------
                               7     SOLE DISPOSITIVE POWER

                                        NONE
                             ------- ----------------------------------------------------------------------------------------------
                               8     SHARED DISPOSITIVE POWER

                                        1,126,575
- ------------- ---------------------------------------------------------------------------------------------------------------------
     9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                        1,126,575
- ------------- ---------------------------------------------------------------------------------------------------------------------
     10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*


- ------------- ---------------------------------------------------------------------------------------------------------------------
     11       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                   8.4%
- ------------- ---------------------------------------------------------------------------------------------------------------------
     12       TYPE OF REPORTING PERSON*

              PN
- ------------- ---------------------------------------------------------------------------------------------------------------------
</TABLE>
                                       2
<PAGE>

<TABLE>
<CAPTION>
<S>                                                                  <C>                  <C>
- -----------------------------------------------------                                     -----------------------------------------
CUSIP No.  20009P-10-3                                                13G                                Page 3 of 16 Pages
- -----------------------------------------------------                                     -----------------------------------------

- ------------- ---------------------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSONS
              S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

              SEQUOIA PARTNERS (O)     94-3166264
- ------------- ---------------------------------------------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                               (a)     [ ]
                                                                                              (b)     [X] 
- ------------- ---------------------------------------------------------------------------------------------------------------------
     3        SEC USE ONLY


- ------------- ---------------------------------------------------------------------------------------------------------------------
     4        CITIZENSHIP OR PLACE OF ORGANIZATION

              CALIFORNIA
- ---------------------------- ------- ----------------------------------------------------------------------------------------------
     NUMBER OF SHARES          5     SOLE VOTING POWER
BENEFICIALLY OWNED BY EACH
   REPORTING PERSON WITH                NONE
                             ------- ----------------------------------------------------------------------------------------------
                               6     SHARED VOTING POWER
                                     
                                        1,126,575
                             ------- ----------------------------------------------------------------------------------------------
                               7     SOLE DISPOSITIVE POWER

                                        NONE
                             ------- ----------------------------------------------------------------------------------------------
                               8     SHARED DISPOSITIVE POWER

                                        1,126,575
- ------------- ---------------------------------------------------------------------------------------------------------------------
     9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                        1,126,575
- ------------- ---------------------------------------------------------------------------------------------------------------------
     10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*


- ------------- ---------------------------------------------------------------------------------------------------------------------
     11       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                   8.4%
- ------------- ---------------------------------------------------------------------------------------------------------------------
     12       TYPE OF REPORTING PERSON*

              PN
- ------------- ---------------------------------------------------------------------------------------------------------------------
</TABLE>
                                       3
<PAGE>

<TABLE>
<CAPTION>

<S>                                                                  <C>                  <C>
- -----------------------------------------------------                                     -----------------------------------------
CUSIP No. 20009P-10-3                                                13G                                Page 4 of 16 Pages
- -----------------------------------------------------                                     -----------------------------------------

- ------------- ---------------------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSONS
              S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

              SEQUOIA TECHNOLOGY PARTNERS VI    94-3166266
- ------------- ---------------------------------------------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                               (a)     [ ]
                                                                                              (b)     [X] 
- ------------- ---------------------------------------------------------------------------------------------------------------------
     3        SEC USE ONLY


- ------------- ---------------------------------------------------------------------------------------------------------------------
     4        CITIZENSHIP OR PLACE OF ORGANIZATION

              CALIFORNIA
- ---------------------------- ------- ----------------------------------------------------------------------------------------------
     NUMBER OF SHARES          5     SOLE VOTING POWER
BENEFICIALLY OWNED BY EACH
   REPORTING PERSON WITH                NONE
                             ------- ----------------------------------------------------------------------------------------------
                               6     SHARED VOTING POWER
                                     
                                        61,901
                             ------- ----------------------------------------------------------------------------------------------
                               7     SOLE DISPOSITIVE POWER

                                        NONE
                             ------- ----------------------------------------------------------------------------------------------
                               8     SHARED DISPOSITIVE POWER

                                        61,901
- ------------- ---------------------------------------------------------------------------------------------------------------------
     9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                        61,901
- ------------- ---------------------------------------------------------------------------------------------------------------------
     10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*


- ------------- ---------------------------------------------------------------------------------------------------------------------
     11       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                   LESS THAN 1%
- ------------- ---------------------------------------------------------------------------------------------------------------------
     12       TYPE OF REPORTING PERSON*

              PN
- ------------- ---------------------------------------------------------------------------------------------------------------------
</TABLE>
                                       4
<PAGE>

<TABLE>
<CAPTION>
<S>                                                                  <C>                  <C>
- -----------------------------------------------------                                     -----------------------------------------
CUSIP No. 20009P-10-3                                                 13G                                Page 5 of 16 Pages
- -----------------------------------------------------                                     -----------------------------------------

- ------------- ---------------------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSONS
              S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

              SEQUOIA XXIV
- ------------- ---------------------------------------------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                               (a)     [ ]
                                                                                              (b)     [X] 
- ------------- ---------------------------------------------------------------------------------------------------------------------
     3        SEC USE ONLY


- ------------- ---------------------------------------------------------------------------------------------------------------------
     4        CITIZENSHIP OR PLACE OF ORGANIZATION

              CALIFORNIA
- ---------------------------- ------- ----------------------------------------------------------------------------------------------
     NUMBER OF SHARES          5     SOLE VOTING POWER
BENEFICIALLY OWNED BY EACH
   REPORTING PERSON WITH                NONE
                             ------- ----------------------------------------------------------------------------------------------
                               6     SHARED VOTING POWER
                                     
                                        33,012
                             ------- ----------------------------------------------------------------------------------------------
                               7     SOLE DISPOSITIVE POWER

                                        NONE
                             ------- ----------------------------------------------------------------------------------------------
                               8     SHARED DISPOSITIVE POWER

                                        33,012
- ------------- ---------------------------------------------------------------------------------------------------------------------
     9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                        33,012
- ------------- ---------------------------------------------------------------------------------------------------------------------
     10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*


- ------------- ---------------------------------------------------------------------------------------------------------------------
     11       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                  LESS THAN 1%
- ------------- ---------------------------------------------------------------------------------------------------------------------
     12       TYPE OF REPORTING PERSON*

              PN
- ------------- ---------------------------------------------------------------------------------------------------------------------
</TABLE>
                                       5
<PAGE>

<TABLE>
<CAPTION>
<S>                                                                  <C>                  <C>
- -----------------------------------------------------                                     -----------------------------------------
CUSIP No. 20009P-10-3                                                13G                                Page 6 of 16 Pages
- -----------------------------------------------------                                     -----------------------------------------

- ------------- ---------------------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSONS
              S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

              SEQUOIA 1995
- ------------- ---------------------------------------------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                               (a)     [ ]
                                                                                              (b)     [X] 
- ------------- ---------------------------------------------------------------------------------------------------------------------
     3        SEC USE ONLY


- ------------- ---------------------------------------------------------------------------------------------------------------------
     4        CITIZENSHIP OR PLACE OF ORGANIZATION

              CALIFORNIA
- ---------------------------- ------- ----------------------------------------------------------------------------------------------
     NUMBER OF SHARES          5     SOLE VOTING POWER
BENEFICIALLY OWNED BY EACH
   REPORTING PERSON WITH                NONE
                             ------- ----------------------------------------------------------------------------------------------
                               6     SHARED VOTING POWER
                                     
                                        15,780
                             ------- ----------------------------------------------------------------------------------------------
                               7     SOLE DISPOSITIVE POWER

                                        NONE
                             ------- ----------------------------------------------------------------------------------------------
                               8     SHARED DISPOSITIVE POWER

                                        15,780
- ------------- ---------------------------------------------------------------------------------------------------------------------
     9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                        15,780
- ------------- ---------------------------------------------------------------------------------------------------------------------
     10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*


- ------------- ---------------------------------------------------------------------------------------------------------------------
     11       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                   LESS THAN 1%
- ------------- ---------------------------------------------------------------------------------------------------------------------
     12       TYPE OF REPORTING PERSON*

              PN
- ------------- ---------------------------------------------------------------------------------------------------------------------
</TABLE>
                                       6
<PAGE>

<TABLE>
<CAPTION>
<S>                                                                  <C>                  <C>
- -----------------------------------------------------                                     -----------------------------------------
CUSIP No. 20009P-10-3                                                 13G                                Page 7 of 16 Pages
- -----------------------------------------------------                                     -----------------------------------------

- ------------- ---------------------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSONS
              S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

              PIERRE LAMOND
- ------------- ---------------------------------------------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                               (a)     [ ]
                                                                                              (b)     [X] 
- ------------- ---------------------------------------------------------------------------------------------------------------------
     3        SEC USE ONLY


- ------------- ---------------------------------------------------------------------------------------------------------------------
     4        CITIZENSHIP OR PLACE OF ORGANIZATION

              USA
- ---------------------------- ------- ----------------------------------------------------------------------------------------------
     NUMBER OF SHARES          5     SOLE VOTING POWER
BENEFICIALLY OWNED BY EACH
   REPORTING PERSON WITH                NONE
                             ------- ----------------------------------------------------------------------------------------------
                               6     SHARED VOTING POWER
                                     
                                        1,237,268
                             ------- ----------------------------------------------------------------------------------------------
                               7     SOLE DISPOSITIVE POWER

                                        NONE
                             ------- ----------------------------------------------------------------------------------------------
                               8     SHARED DISPOSITIVE POWER

                                        1,237,268
- ------------- ---------------------------------------------------------------------------------------------------------------------
     9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                        1,237,268
- ------------- ---------------------------------------------------------------------------------------------------------------------
     10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*


- ------------- ---------------------------------------------------------------------------------------------------------------------
     11       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                   9.2%
- ------------- ---------------------------------------------------------------------------------------------------------------------
     12       TYPE OF REPORTING PERSON*

              PN
- ------------- ---------------------------------------------------------------------------------------------------------------------
</TABLE>
                                       7
<PAGE>

<TABLE>
<CAPTION>
<S>                                                                  <C>                  <C>
- -----------------------------------------------------                                     -----------------------------------------
CUSIP No.20009P-10-3                                                  13G                                Page 8 of 16 Pages
- -----------------------------------------------------                                     -----------------------------------------

- ------------- ---------------------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSONS
              S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

              DOUGLAS LEONE
- ------------- ---------------------------------------------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                               (a)     [ ]
                                                                                              (b)     [X] 
- ------------- ---------------------------------------------------------------------------------------------------------------------
     3        SEC USE ONLY


- ------------- ---------------------------------------------------------------------------------------------------------------------
     4        CITIZENSHIP OR PLACE OF ORGANIZATION

              USA
- ---------------------------- ------- ----------------------------------------------------------------------------------------------
     NUMBER OF SHARES          5     SOLE VOTING POWER
BENEFICIALLY OWNED BY EACH
   REPORTING PERSON WITH                NONE
                             ------- ----------------------------------------------------------------------------------------------
                               6     SHARED VOTING POWER
                                     
                                        1,237,268
                             ------- ----------------------------------------------------------------------------------------------
                               7     SOLE DISPOSITIVE POWER

                                        NONE
                             ------- ----------------------------------------------------------------------------------------------
                               8     SHARED DISPOSITIVE POWER

                                        1,237,268
- ------------- ---------------------------------------------------------------------------------------------------------------------
     9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                        1,237,268
- ------------- ---------------------------------------------------------------------------------------------------------------------
     10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*


- ------------- ---------------------------------------------------------------------------------------------------------------------
     11       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                   9.2%
- ------------- ---------------------------------------------------------------------------------------------------------------------
     12       TYPE OF REPORTING PERSON*

              PN
- ------------- ---------------------------------------------------------------------------------------------------------------------
</TABLE>
                                       8
<PAGE>

<TABLE>
<CAPTION>
<S>                                                                  <C>                  <C>
- -----------------------------------------------------                                     -----------------------------------------
CUSIP No. 20009P-10-3                                                 13G                                Page 9 of 16 Pages
- -----------------------------------------------------                                     -----------------------------------------

- ------------- ---------------------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSONS
              S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

              J. THOMAS MCMURRAY
- ------------- ---------------------------------------------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                               (a)     [ ]
                                                                                              (b)     [X] 
- ------------- ---------------------------------------------------------------------------------------------------------------------
     3        SEC USE ONLY


- ------------- ---------------------------------------------------------------------------------------------------------------------
     4        CITIZENSHIP OR PLACE OF ORGANIZATION

              USA
- ---------------------------- ------- ----------------------------------------------------------------------------------------------
     NUMBER OF SHARES          5     SOLE VOTING POWER
BENEFICIALLY OWNED BY EACH
   REPORTING PERSON WITH                NONE
                             ------- ----------------------------------------------------------------------------------------------
                               6     SHARED VOTING POWER
                                     
                                        1,237,268
                             ------- ----------------------------------------------------------------------------------------------
                               7     SOLE DISPOSITIVE POWER

                                        NONE
                             ------- ----------------------------------------------------------------------------------------------
                               8     SHARED DISPOSITIVE POWER

                                        1,237,268
- ------------- ---------------------------------------------------------------------------------------------------------------------
     9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                        1,237,268
- ------------- ---------------------------------------------------------------------------------------------------------------------
     10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*


- ------------- ---------------------------------------------------------------------------------------------------------------------
     11       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                   9.2%
- ------------- ---------------------------------------------------------------------------------------------------------------------
     12       TYPE OF REPORTING PERSON*

              PN
- ------------- ---------------------------------------------------------------------------------------------------------------------
</TABLE>
                                       9
<PAGE>

<TABLE>
<CAPTION>
<S>                                                                  <C>                  <C>
- -----------------------------------------------------                                     -----------------------------------------
CUSIP No. 20009P-10-3                                                 13G                                Page 10 of 16 Pages
- -----------------------------------------------------                                     -----------------------------------------

- ------------- ---------------------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSONS
              S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

              MICHAEL MORITZ
- ------------- ---------------------------------------------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                               (a)     [ ]
                                                                                              (b)     [X] 
- ------------- ---------------------------------------------------------------------------------------------------------------------
     3        SEC USE ONLY


- ------------- ---------------------------------------------------------------------------------------------------------------------
     4        CITIZENSHIP OR PLACE OF ORGANIZATION

              USA
- ---------------------------- ------- ----------------------------------------------------------------------------------------------
     NUMBER OF SHARES          5     SOLE VOTING POWER
BENEFICIALLY OWNED BY EACH
   REPORTING PERSON WITH                NONE
                             ------- ----------------------------------------------------------------------------------------------
                               6     SHARED VOTING POWER
                                     
                                        1,237,268
                             ------- ----------------------------------------------------------------------------------------------
                               7     SOLE DISPOSITIVE POWER

                                        NONE
                             ------- ----------------------------------------------------------------------------------------------
                               8     SHARED DISPOSITIVE POWER

                                        1,237,268
- ------------- ---------------------------------------------------------------------------------------------------------------------
     9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                        1,237,268
- ------------- ---------------------------------------------------------------------------------------------------------------------
     10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*


- ------------- ---------------------------------------------------------------------------------------------------------------------
     11       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                 9.2%
- ------------- ---------------------------------------------------------------------------------------------------------------------
     12       TYPE OF REPORTING PERSON*

              PN
- ------------- ---------------------------------------------------------------------------------------------------------------------
</TABLE>
                                       10
<PAGE>

<TABLE>
<CAPTION>
<S>                                                                  <C>                  <C>
- -----------------------------------------------------                                     -----------------------------------------
CUSIP No. 20009P-10-3                                                 13G                                Page 11 of 16 Pages
- -----------------------------------------------------                                     -----------------------------------------

- ------------- ---------------------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSONS
              S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

              THOMAS STEPHENSON
- ------------- ---------------------------------------------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                               (a)     [ ]
                                                                                              (b)     [X] 
- ------------- ---------------------------------------------------------------------------------------------------------------------
     3        SEC USE ONLY


- ------------- ---------------------------------------------------------------------------------------------------------------------
     4        CITIZENSHIP OR PLACE OF ORGANIZATION

              USA
- ---------------------------- ------- ----------------------------------------------------------------------------------------------
     NUMBER OF SHARES          5     SOLE VOTING POWER
BENEFICIALLY OWNED BY EACH
   REPORTING PERSON WITH                NONE
                             ------- ----------------------------------------------------------------------------------------------
                               6     SHARED VOTING POWER
                                     
                                        1,237,268
                             ------- ----------------------------------------------------------------------------------------------
                               7     SOLE DISPOSITIVE POWER

                                        NONE
                             ------- ----------------------------------------------------------------------------------------------
                               8     SHARED DISPOSITIVE POWER

                                        1,237,268
- ------------- ---------------------------------------------------------------------------------------------------------------------
     9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                        1,237,268
- ------------- ---------------------------------------------------------------------------------------------------------------------
     10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*


- ------------- ---------------------------------------------------------------------------------------------------------------------
     11       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                  9.2%
- ------------- ---------------------------------------------------------------------------------------------------------------------
     12       TYPE OF REPORTING PERSON*

              PN
- ------------- ---------------------------------------------------------------------------------------------------------------------
</TABLE>
                                       11
<PAGE>

<TABLE>
<CAPTION>
<S>                                                                  <C>                  <C>
- -----------------------------------------------------                                     -----------------------------------------
CUSIP No. 20009P-10-3                                                13G                                Page 12 of 16 Pages
- -----------------------------------------------------                                     -----------------------------------------

- ------------- ---------------------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSONS
              S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

              MARK STEVENS
- ------------- ---------------------------------------------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                               (a)     [ ]
                                                                                              (b)     [X] 
- ------------- ---------------------------------------------------------------------------------------------------------------------
     3        SEC USE ONLY


- ------------- ---------------------------------------------------------------------------------------------------------------------
     4        CITIZENSHIP OR PLACE OF ORGANIZATION

              USA
- ---------------------------- ------- ----------------------------------------------------------------------------------------------
     NUMBER OF SHARES          5     SOLE VOTING POWER
BENEFICIALLY OWNED BY EACH
   REPORTING PERSON WITH                NONE
                             ------- ----------------------------------------------------------------------------------------------
                               6     SHARED VOTING POWER
                                     
                                        1,237,268
                             ------- ----------------------------------------------------------------------------------------------
                               7     SOLE DISPOSITIVE POWER

                                        NONE
                             ------- ----------------------------------------------------------------------------------------------
                               8     SHARED DISPOSITIVE POWER

                                        1,237,268
- ------------- ---------------------------------------------------------------------------------------------------------------------
     9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                        1,237,268
- ------------- ---------------------------------------------------------------------------------------------------------------------
     10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*


- ------------- ---------------------------------------------------------------------------------------------------------------------
     11       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                   9.2%
- ------------- ---------------------------------------------------------------------------------------------------------------------
     12       TYPE OF REPORTING PERSON*

              PN
- ------------- ---------------------------------------------------------------------------------------------------------------------
</TABLE>
                                       12
<PAGE>
<TABLE>
<CAPTION>

<S>                                                                  <C>                  <C>
- -----------------------------------------------------                                     -----------------------------------------
CUSIP No. 20009P-10-3                                                13G                                Page 13 of 16 Pages
- -----------------------------------------------------                                     -----------------------------------------

- ------------- ---------------------------------------------------------------------------------------------------------------------
     1        NAME OF REPORTING PERSONS
              S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSONS

              DONALD VALENTINE
- ------------- ---------------------------------------------------------------------------------------------------------------------
     2        CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                               (a)     [ ]
                                                                                              (b)     [X] 
- ------------- ---------------------------------------------------------------------------------------------------------------------
     3        SEC USE ONLY


- ------------- ---------------------------------------------------------------------------------------------------------------------
     4        CITIZENSHIP OR PLACE OF ORGANIZATION

              USA
- ---------------------------- ------- ----------------------------------------------------------------------------------------------
     NUMBER OF SHARES          5     SOLE VOTING POWER
BENEFICIALLY OWNED BY EACH
   REPORTING PERSON WITH                NONE
                             ------- ----------------------------------------------------------------------------------------------
                               6     SHARED VOTING POWER
                                     
                                        1,237,268
                             ------- ----------------------------------------------------------------------------------------------
                               7     SOLE DISPOSITIVE POWER

                                        NONE
                             ------- ----------------------------------------------------------------------------------------------
                               8     SHARED DISPOSITIVE POWER

                                        1,237,268
- ------------- ---------------------------------------------------------------------------------------------------------------------
     9        AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

                                        1,237,268
- ------------- ---------------------------------------------------------------------------------------------------------------------
     10       CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*


- ------------- ---------------------------------------------------------------------------------------------------------------------
     11       PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

                   9.2%
- ------------- ---------------------------------------------------------------------------------------------------------------------
     12       TYPE OF REPORTING PERSON*

              PN
- ------------- ---------------------------------------------------------------------------------------------------------------------
</TABLE>
                                       13
<PAGE>


Item 1.

       (a)        Name of Issuer:       COMBICHEM, INC.                    

       (b)        Address of Issuer's Principal Executive Offices:
                                        9050 Camino Santa Fe
                                        San Diego, CA 92121    
                                                   
Item 2.

       (a)        Name of Persons Filing:       Sequoia Capital VI ("SC VI") 
                                                Sequoia Partners (O) (SP(O)")  
                                                Sequoia Technology Partners VI 
                                                  (STP VI")
                                                Sequoia XXIV ("S XXIV")
                                                Sequoia 1995  ("S 1995")
                                                Pierre Lamond ("PL")
                                                Douglas Leone ("DL")
                                                J. Thomas McMurray ("JTM")
                                                Michael Moritz ("MM")
                                                Thomas Stephenson ("TS")
                                                Mark Stevens ("MS")
                                                Donald Valentine ("DV")
 
       (b)        Address of Principal Business Office or, if None, Residence:
                                                3000 Sand Hill Road, 4-280
                                                Menlo Park, CA 94025
                                            
                                           

      (c)        Citizenship:  SC VI, SP (O), STP VI, S XXIV, S 1995: California
                               PL, DL, JTM, MM, TS, MS, DV: USA     
                                            
                                            

       (d)        Title of Class of Securities:         COMMON STOCK
                                            

       (e)        CUSIP Number:                         20009P-10-3
                                            

Item 3. If this statement is filed pursuant to Rules 13d-1(b),or 13d-2(b), check
whether the person filing is a:

                                NOT APPLICABLE

Item 4.  Ownership

                                SEE ROWS 5 THROUGH 11 OF COVER PAGES

Item 5.  Ownership of Five Percent or Less of a Class

       If this  statement  is being filed to report the fact that as of the date
hereof the reporting  person has ceased to be the beneficial  owner of more than
five percent of the class of securities, check the following.

      Instruction. Dissolution of a group requires a response to this item.


Item 6.  Ownership of More than Five Percent on Behalf of Another Person

                                NOT APPLICABLE

                              Page 14 of 16 Pages
<PAGE>

Item 7.  Identification and Classification of the Subsidiary Which Acquired the
         Security Being Reported on by the Parent Holding Company

                                NOT APPLICABLE

Item 8.  Identification and Classification of Members of the Group

                                NOT APPLICABLE

Item 9.  Notice of Dissolution of Group


                                NOT APPLICABLE
Item 10. Certification

       [The following  certification shall be included if the statement is filed
pursuant to Rule 13d-1(b):]

       By signing  below I certify that, to the best of my knowledge and belief,
the  securities  referred  to above  were  acquired  in the  ordinary  course of
business  and were not acquired for the purpose of and do not have the effect of
changing or  influencing  the control of the issuer of such  securities and were
not acquired in connection  with or as a participant in any  transaction  having
such purpose or effect.]


[EXHIBITS]



                              Page 15 of 16 Pages

<PAGE>



                                    SIGNATURE

       After  reasonable  inquiry and to the best of my knowledge and belief,  I
certify that the information  set forth in this statement is true,  complete and
correct.

Date:           ,1999

SEQUOIA CAPITAL VI                              
By its General Partner
SEQUOIA PARTNERS (O)

- --------------------------------
Douglas Leone, General Partner

SEQUOIA PARTNERS (O)
SEQUOIA TECHNOLOGY PARTNERS VI
SEQUOIA XXIV
SEQUOIA 1995


- --------------------------------
Pierre Lamond


- --------------------------------
Douglas Leone


- --------------------------------
J. Thomas McMurray


- --------------------------------
Michael Moritz


- --------------------------------
Thomas Stephenson


- --------------------------------
Mark Stevens


- --------------------------------
Donald Valentine

                              Page 16 of 16 Pages





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