CONNETICS CORP
SC 13D, 1998-04-20
PHARMACEUTICAL PREPARATIONS
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                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549


                                  SCHEDULE 13D


                    Under the Securities Exchange Act of 1934

                              Connetics Corporation
                              ---------------------
                                (Name of Issuer)

                                  Common Stock
                         ------------------------------
                         (Title of Class of Securities)

                                   0002078541
                                 --------------
                                 (CUSIP Number)

                                 Eileen McCarthy
                       One Post Office Square, Suite 3800
                                Boston, MA 02109
                                 (617) 482-8020
                         ------------------------------
           (Name, Address and Telephone Number of Person Authorized to
                       Receive Notices and Communications)

                                 April 10, 1998
                         ------------------------------
             (Date of Event which Requires Filing of this Statement)

         If the filing person has  previously  filed a statement on Schedule 13G
to report the  acquisition  which is the subject of this  Schedule  13D,  and is
filing this schedule  because of Rule  13d-1(b)(3)  or (4),  check the following
box:.

         Check the following box if a fee is being paid with this statement:. (A
fee is not required only if the reporting person:  (1) has a previous  statement
on file reporting beneficial ownership of more than five percent of the class of
securities  described  in Item 1;  and (2) has  filed  no  amendment  subsequent
thereto  reporting  beneficial  ownership of five percent or less of such class.
(See Rule 13d-7).

         Note: Six copies of this statement,  including all exhibits,  should be
filed with the  Commission.  See Rule  13d-1(a) for other parties to whom copies
are to be sent.

         * 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 on 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,  as  amended  (the  "Exchange  Act") or  otherwise  subject  to the
liabilities  of that  section  of the  Exchange  Act but shall be subject to all
other provisions of the Exchange Act.

                        (Continued on following page(s))

                               Page 1 of 48 Pages


<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                13D                                         Page 2 of 48 Pages

<S>                                                                                     <C>                  <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons. SS or I.R.S. Identification Nos. of Above Persons

       Alta Partners
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b))X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       WC
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

      California
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power        2,162,163
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      -0-


                                                                                (9)  Sole Dispositive Power   2,162,163


                                                                                (10) Shared Dispositive Power -0-


  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  2,162,163
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  13.8%
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IA
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 2 of 48 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                13D                                         Page 3 of 48 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Alta BioPharma Partners, L.P.
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b))X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       WC
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

      Delaware
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power        1,367,712
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      -0-


                                                                                (9)  Sole Dispositive Power   1,367,712


                                                                                (10) Shared Dispositive Power -0-


  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  1,367,712
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  8.7%
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  PN
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 3 of 48 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 4 of 48 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Alta Embarcadero BioPharma, LLC
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b))X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

        WC
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

    Delaware
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power        49,187
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      -0-



                                                                                (9)  Sole Dispositive Power   49,187



                                                                                (10) Shared Dispositive Power -0-



- -----------------------------------------------------------------------------------------------------------------------
  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  49,187
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  .3%
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  CO
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>
                                                   Page 4 of 48 Pages
<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                              Page 5 of 48 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Connetics Partners (Alta Bio), LLC
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b))X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

          WC
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

      Delaware
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power        745,264
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      -0-


                                                                                (9)  Sole Dispositive Power   745,264


                                                                                (10) Shared Dispositive Power -0-


- -----------------------------------------------------------------------------------------------------------------------
  (11)     Aggregate Amount Beneficially Owned By Each Reporting Person

                  745,264
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  4.8%
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  CO
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 5 of 48 Pages

<PAGE>
<TABLE>
<CAPTION>

CUSIP No. 0002078541                                             13D                              Page 6 of 48 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Alta BioPharma Management, LLC
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b))X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       WC
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       Delaware
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power        1,367,712
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power        794,451


                                                                                (9)  Sole Dispositive Power   1,367,712


                                                                                (10) Shared Dispositive Power   794,451

- -----------------------------------------------------------------------------------------------------------------------
  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  2,162,163
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  13.8%
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  CO
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 6 of 48 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                             Page 7 of 48 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Alta/Chase BioPharma Management, LLC
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b))X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       WC
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       Delaware
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power         745,264
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      1,416,899


                                                                                (9)  Sole Dispositive Power     745,264


                                                                                (10) Shared Dispositive Power 1,416,899

- -----------------------------------------------------------------------------------------------------------------------
  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  2,162,163
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  13.8%
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  CO
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 7 of 48 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                              Page 8 of 48 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Jean Deleage
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b)X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       AF
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       U.S.A.
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power        -0-
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      2,162,183


                                                                                (9)  Sole Dispositive Power   -0-


                                                                                (10) Shared Dispositive Power 2,162,183

- -----------------------------------------------------------------------------------------------------------------------
  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  268,564
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  13.8%
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 8 of 48 Pages
<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541       13D                                 Page 9 of 48 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Garrett Gruener
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b)X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

          AF
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

          U.S.A.
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power        -0-
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      2,162,183


                                                                                (9)  Sole Dispositive Power   -0-


                                                                                (10) Shared Dispositive Power 2,162,183

- -----------------------------------------------------------------------------------------------------------------------
  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  2,162,183
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  13.8%
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                   Page 9 of 48 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 10 of 48 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

      Daniel Janney
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b)X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       AF
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       U.S.A.
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power        -0-
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      2,162,183


                                                                                (9)  Sole Dispositive Power   -0-


                                                                                (10) Shared Dispositive Power 2,162,183

- -----------------------------------------------------------------------------------------------------------------------
(11)     Aggregate Amount Beneficially Owned By Each Reporting Person

                  2,162,183
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  13.8%
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                  Page 10 of 48 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 11 of 48 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Alix Marduel
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b)X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       PF, AF
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       U.S.A.
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power        -0-
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      2,162,183


                                                                                (9)  Sole Dispositive Power   -0-


                                                                                (10) Shared Dispositive Power 2,162,183

- -----------------------------------------------------------------------------------------------------------------------
  (11)   Aggregate Amount Beneficially Owned By Each Reporting Person

                  2,162,183
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  13.8%
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                  Page 11 of 48 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 12 of 48 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Guy Nohra
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b)X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

          AF
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

          U.S.A.
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power        -0-
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      2,162,183


                                                                                (9)  Sole Dispositive Power   -0-


                                                                                (10) Shared Dispositive Power 2,162,183

- -----------------------------------------------------------------------------------------------------------------------
(11)     Aggregate Amount Beneficially Owned By Each Reporting Person

                  2,162,183
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  13.8%
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                  Page 12 of 48 Pages

<PAGE>

<TABLE>
<CAPTION>
CUSIP No. 0002078541                                             13D                            Page 13 of 48 Pages
<S>                                                                                     <C>                   <C>
- -----------------------------------------------------------------------------------------------------------------------
  (1) Names of Reporting Persons.  SS or I.R.S. Identification Nos. of Above Persons

       Marino Polestra
- -----------------------------------------------------------------------------------------------------------------------
  (2) Check The Appropriate Box If A Member Of A Group                                  (a):
                                                                                        (b)X
- -----------------------------------------------------------------------------------------------------------------------
  (3)    SEC Use Only

- -----------------------------------------------------------------------------------------------------------------------
  (4)    Source Of Funds*

       AF
- -----------------------------------------------------------------------------------------------------------------------
  (5)    Check Box If Disclosure Of Legal Proceedings Is Required Pursuant To Items 2(d) Or 2(e):

- -----------------------------------------------------------------------------------------------------------------------
  (6)    Citizenship Or Place Of Organization

       U.S.A.
- -----------------------------------------------------------------------------------------------------------------------
Number Of Shares                                                                (7)  Sole Voting Power        -0-
Beneficially Owned
By Each Reporting
Person With                                                                     (8)  Shared Voting Power      2,162,183


                                                                                (9)  Sole Dispositive Power   -0-


                                                                                (10) Shared Dispositive Power 2,162,183

- -----------------------------------------------------------------------------------------------------------------------
(11)     Aggregate Amount Beneficially Owned By Each Reporting Person

                  2,162,183
- -----------------------------------------------------------------------------------------------------------------------
  (12)   Check If The Aggregate Amount In Row (11) Excludes Certain Shares*

- -----------------------------------------------------------------------------------------------------------------------
  (13)   Percent Of Class Represented By Amount In Row (11)

                  13.8%
- -----------------------------------------------------------------------------------------------------------------------
  (14)   Type Of Reporting Person

                  IN
- -----------------------------------------------------------------------------------------------------------------------
<FN>
                                           *SEE INSTRUCTION BEFORE FILLING OUT!
</FN>
</TABLE>

                                                  Page 13 of 48 Pages

<PAGE>

Item 1.  Security and Issuer.

                  This  Statement  on  Schedule D relates  to the Common  Stock,
$0.001 par value per share (the "Shares"), of Connetics Corporation,  a Delaware
corporation (the "Company").  The principal executive offices of the Company are
located at 3400 West Bossier Road, Palo Alto, California 94303.


Item 2.           Identity and Background.

                  (a) This Statement is filed by Alta BioPharma Partners,  L.P.,
a  Delaware  limited  partnership  ("Alta  BioPharma"),   and  Alta  Embarcadero
BioPharma,  LLC, a Delaware limited liability company  ("Embarcadero  LLC"), and
Connetics  Partners (Alta Bio),  LLC, a Delaware LLC  ("Connetics  Alta Bio") by
virtue  of their  direct  beneficial  ownership  of  Shares,  by Alta  BioPharma
Management   Partners,   LLC,  a  Delaware  limited   liability  company  ("Alta
Management"),  by virtue of being the sole general partner of Alta BioPharma, by
Alta/Chase  BioPharma  Management  LLC, a  Delaware  limited  liability  company
(Alta/Chase  Management)  by  virtue  of being  the sole  managing  director  of
Connetics  Partners  (Alta  Bio),  LLC  and  by  Alta  Partners,   a  California
corporation  ("Alta  Partners"),  by  virtue of being  the  management  advisory
company of these entities. Alta BioPharma,  Embarcadero LLC, Connetics Alta Bio,
Alta  Management,  Alta/Chase  Management  and Alta  Partners  are  collectively
referred to as the  "Reporting  Persons."  Jean Deleage,  Garrett  Gruener,  Dan
Janney,  Alix Marduel,  Guy Nohra and Marino Polestra are the managing directors
of Alta  Management,  Alta/Chase  Management  and officers of Alta Partners (the
"Partners"). By virtue of the relationships described above and their roles with
Alta  Partners,  each of the Partners  may be deemed to control  Alta  Partners,
Alta/Chase Management, Alta Management, and, therefore, may be deemed to possess
indirect beneficial ownership of the Shares held by each entity.  However,  none
of the Partners,  acting alone,  has voting or investment  power with respect to
the Shares  directly  beneficially  held by the entities  and, as a result,  the
Partners disclaim beneficial ownership of the Shares directly beneficially owned
by each entity, except to the extent of their pecuniary interest in each entity.
Embarcadero  LLC is a side  company that makes all  investments  pro rata to the
capital of Alta  BioPharma  with all  allocations  made to its members  based on
paid-in  capital.  Certain of the  Partners are members of  Embarcadero  LLC and
certain members of Embarcadero LLC are affiliates of Alta Partners.

                  (b)  The  principal   executive  offices  of  Alta  BioPharma,
Embarcadero LLC, Connetics Alta Bio, Alta Management,  Alta/Chase Management and
Alta  Partners,  and the business  address of each  Partner,  are located at One
Embarcadero Center, Suite 4050, San Francisco, California 94111.

                  (c) Alta Partners  provides  investment  advisory  services to
venture capital firms. Alta BioPharma,  Connetics Alta Bio and Embarcadero LLC's
principal business is acting as venture capital investment vehicles.  Alta/Chase
Management  and Alta  Management's  principal  business  is acting  as  managing
director of Connetics  Alta Bio and Alta  BioPharma,  respectively.  Each of the
Partners' principal business is acting as a managing director of Alta Management
and Alta/Chase Management and as an officer of Alta Partners.

                  (d) None of the Reporting  Persons or, to the knowledge of the
Reporting  Persons,  any of the  Partners,  has  been  convicted  in a  criminal
proceeding  in the past five  years  (excluding  traffic  violations  or similar
misdemeanors).

                  (e) During the past five years,  none of the Reporting Persons
or, to the knowledge of the Reporting Persons, and of the Partners,  was a party
to a  civil  proceeding  of a  judicial  or  administrative  body  of  competent
jurisdiction  as a result of which such  person was or is subject to a judgment,
decree  or final  order  enjoining  future  violations  of,  or  prohibiting  or
mandating activities subject to, federal or state securities laws of finding any
violation with respect to such laws.

                               Page 14 of 48 Pages

<PAGE>

                  (f) Alta Partners is a California corporation.  Alta BioPharma
is a  Delaware  limited  partnership.  Embarcadero  LLC  is a  Delaware  limited
liability corporation.  Connetics Alta Bio is a Delaware liability company. Alta
Management and Alta/Chase  Management are Delaware limited liability  companies.
Each of the Managing Directors is a citizen of the United States.


Item 3.           Source and Amount of Funds or Other Consideration.

                  The  total  amount  of funds  required  by Alta  BioPharma  to
acquire  the  1,367,712  shares  of  Common  Stock  reported  in Item  5(a)  was
$6,325,668, the total amount of funds required by Embarcadero LLC to acquire the
49,187  shares of Common  Stock  reported in Item 5(a) was  $227,489.88  and the
total  amount of funds  required  by  Connetics  Alta Bio to acquire the 745,264
shares of Common  Stock  reported in Item 5(a) was  $3,446,846.  Such funds were
provided by each entities' capital available for investment.


Item 4.           Purpose of Transaction.

                  Alta  BioPharma,  Embarcadero  LLC,  and  Connetics  Alta  Bio
acquired the Common Stock reported in Item 5(c) for investment  only.  Depending
upon their  evaluation  of the Company's  investments  and  prospects,  and upon
future developments  (including,  but not limited to, market for the Shares, the
effective yield on the Shares, availability of funds, alternative uses of funds,
and money, stock market and general economic conditions),  each of the Reporting
Persons may from time to time  purchase  the Common  Stock,  dispose of all or a
portion of the Common  Stock that it holds,  or cease  buying or selling  Common
Stock. Any such additional purchases or sales of the Common Stock may be in open
market or privately-negotiated transactions or otherwise.

                  On  April  10,  1998,  Alta  BioPharma,  Embarcadero  LLC  and
Connetics Alta Bio entered into a Common Stock  Purchase  Agreement (the "Common
Stock" Purchase  Agreement")  with the Company pursuant to which Alta BioPharma,
Embarcadero LLC and Connetics Alta Bio acquired, for an aggregate purchase price
of  $10,000,003.88,  a total of 2,162,163  Shares of Common Stock.  The entities
also entered into a Registration Rights Agreement.

Item 5.           Interest in Securities of the Issuer.

                  (a) Alta BioPharma is the direct beneficial owner of 1,367,712
shares of Common Stock or approximately  8.73% of the shares deemed  outstanding
by the Company  (15,672,163)  as of April 10,  1998.  Connetics  Alta Bio is the
direct beneficial owner of 745,264 shares of Common Stock or approximately 4.75%
of the shares deemed  outstanding  by the Company  (15,672,163)  as of April 10,
1998.  Embarcadero LLC is the direct beneficial owner of 49,187 shares of Common
Stock or  approximately  .31% of the shares  deemed  outstanding  by the Company
(15,672,163) as of April 10, 1998.

                  (b) Each entity has the power to direct the disposition of and
vote the stock held by it. By virtue of the  relationships  previously  reported
under Item 2 of this Statement, Alta Management,  Alta/Chase Management and Alta
Partners may be deemed to have indirect beneficial ownership of the shares owned
by such entities.

                  (c) On April 10, 1998 Alta BioPharma,  Connetics Alta Bio, and
Embarcadero  LLC acquired the Shares  described in Item 3 of this Statement in a
privately negotiated transaction with the Company for aggregate consideration of
$6,325,668, $3,446,846 and $227,489.88, respectively.

Except as set forth above,  neither the Reporting  Persons nor the Partners have
effected any transaction in the Shares during the past 60 days.

                              Page 15 of 48 Pages

<PAGE>

                  (d) Alta  BioPharma,  Connetics Alta Bio and  Embarcadero  LLC
each have the right to receive  dividends  and proceeds  from the sale of Common
Stock  held by it.  By virtue of the  relationships  reported  in Item 2 of this
Statement.  Alta  Management,  Alta/Chase  Management  and Alta  Partners may be
deemed to have the power to direct the  receipt of  dividends  and the  proceeds
from the sale of the Common Stock held by each entity.

                  (e)      Not Applicable


                              Page 16 of 48 Pages

<PAGE>

Item 6.           Contracts, Arrangements,  Understandings or Relationships with
Respect to Securities of the Issuer.

                  The  Connetics  Corporation  Common Stock  Purchase  Agreement
dated April 10, 1998 and The Connetics Corporation Registration Rights Agreement
dated April 10, 1998 are hereby incorporated in its entirety by this reference.

Item 7.           Material to be Filed as Exhibits.

                  Exhibit A:  Joint Filing Statement

                  Exhibit B:  Connetics   Corporation   Common  Stock   Purchase
                  Agreement dated April 10, 1998.

                  Exhibit C: Connetics Corporation Registration Rights Agreement
                  dated April 10, 1998.

                  Exhibit D:  Alta   BioPharma   Partners  Limited   Partnership
                  Management Rights Agreement dated April 10, 1998.


                              Page 17 of 48 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:  April 20, 1998

Alta Partners                               Alta BioPharma Partners, L.P.

By:           /s/ Eileen McCarthy       By:  Alta BioPharma Management, LLC
     -------------------------------         Its General Partner
     Eileen McCarthy, Vice President         


Alta BioPharma Management, LLC          By:        /s/ Eileen McCarthy
                                              --------------------------------
                                              Eileen McCarthy, Member

By:           /s/ Eileen McCarthy       Connetics Partners (Alta Bio), LLC
     -------------------------------    
     Eileen McCarthy, Member
                                        By:   Alta/Chase BioPharma Management,
Alta/Chase BioPharma Management, LLC           LLC Its Managing Member        
                                                                              
By:           /s/ Eileen McCarthy       By:        /s/ Eileen McCarthy        
     -------------------------------          --------------------------------
     Eileen McCarthy, Member                  Eileen McCarthy, Member         
                                        
Alta Embarcadero BioPharma, LLC


By:           /s/ Eileen McCarthy
     -------------------------------  
     Eileen McCarthy, Member


         /s/ Jean Deleage                        /s/ Guy Nohra
- ------------------------------          --------------------------------
Jean Deleage                            Guy Nohra

         /s/ Garrett Gruener                     /s/ Marino Polestra
- ------------------------------          --------------------------------
Garrett Gruener                         Marino Polestra

         /s/ Daniel Janney                       /s/ Alix Marduel
- ------------------------------          --------------------------------
Daniel Janney                           Alix Marduel

                               Page 18 of 48 Pages

<PAGE>

                                    EXHIBIT A

                             Joint Filing Statement

         We, the  undersigned,  hereby  express our agreement  that the attached
Schedule 13D is filed on behalf of each of us.


Date:  April 20, 1998

Alta Partners                              Alta BioPharma Partners, L.P.

By:          /s/ Eileen McCarthy      By:  Alta BioPharma Management, 
    -------------------------------        LLC Its General Partner
    Eileen McCarthy, Vice President        

Alta BioPharma Management, LLC             By:           /s/ Eileen McCarthy
                                                -------------------------------
                                                Eileen McCarthy, Member

By:          /s/ Eileen McCarthy      Connetics Partners (Alta Bio), LLC
    -------------------------------
    Eileen McCarthy, Member
                                           By:  Alta/Chase BioPharma Management,
Alta/Chase BioPharma Management, LLC            LLC Its Managing Member
                                                
By:          /s/ Eileen McCarthy           By:           /s/ Eileen McCarthy
    ------------------------------             --------------------------------
    Eileen McCarthy, Member                    Eileen McCarthy, Member

Alta Embarcadero BioPharma, LLC


By:          /s/ Eileen McCarthy
    ------------------------------ 
    Eileen McCarthy, Member


         /s/ Jean Deleage                           /s/ Guy Nohra
- ------------------------------             --------------------------------
Jean Deleage                               Guy Nohra

         /s/ Garrett Gruener                        /s/ Marino Polestra
- ------------------------------             --------------------------------
Garrett Gruener                            Marino Polestra

         /s/ Daniel Janney                          /s/ Alix Marduel
- ------------------------------             --------------------------------
Daniel Janney                              Alix Marduel


                              Page 19 of 48 Pages

<PAGE>


                                                                      Exhibit B





                              CONNETICS CORPORATION


                         COMMON STOCK PURCHASE AGREEMENT


                                 April 10, 1998







                              Page 20 of 48 Pages

<PAGE>


                              CONNETICS CORPORATION
                         COMMON STOCK PURCHASE AGREEMENT



         This Common Stock Purchase  Agreement (the "Agreement") is entered into
as of this 10th day of April,  1998,  among  Connetics  Corporation,  a Delaware
corporation  (the  "Company")  and  Alta  BioPharma  Partners,  L.P.,  Connetics
Partners (Alta Bio), LLC and Alta Embarcadero BioPharma, LLC (each a "Purchaser"
and together the "Purchasers").

                                    SECTION 1

                              Sale of Common Stock

         1.1 Sale of Common Stock.  Subject to the terms and conditions  hereof,
on the Closing  Date, as defined  below,  the Company will issue and sell to the
Purchasers,  and the Purchasers will purchase from the Company,  an aggregate of
2,162,163  shares of Common  Stock,  par value $0.001 per share,  of the Company
(the "Common Stock"),  for an aggregate  purchase price of  $10,000,003.88.  The
number of shares of Common  Stock to be purchased  and the purchase  price to be
paid by each Purchaser are as follows:

Purchaser                                Number of Shares        Purchase Price
- ---------                                ----------------        --------------
Alta BioPharma Partners, L.P.                1,367,712            $6,325,668.00
Connetics Partners (Alta Bio), LLC             745,264            $3,446,846.00
Alta Embarcadero BioPharma, LLC                 49,187              $227,489.88
                                                                 
                                                               
         1.2 Closing Date. The closing (the  "Closing") of the purchase and sale
of the Common Stock shall be held at the offices of Venture Law Group, 2800 Sand
Hill Road,  Menlo  Park,  California  at 10:00 a.m. on April 10, 1998 or at such
other time and place upon which the Company and the  Purchasers  shall  mutually
agree  (the date of the  Closing  is  hereinafter  referred  to as the  "Closing
Date").

         1.3  Delivery.  At the  Closing,  the  Company  will  deliver  to  each
Purchaser a certificate or certificates  representing the shares of Common Stock
purchased by such Purchaser,  against payment of the purchase price therefor, by
wire transfer or certified or cashier's  check drawn on a United States ("U.S.")
bank.

         1.4 Legend.  The certificate or certificates for the Common Stock shall
be subject to a legend restricting transfer under the Securities Act of 1933, as
amended (the "Securities Act") and referring to restrictions on transfer herein,
such legend to be substantially as follows:

         "THE  SECURITIES   REPRESENTED  BY  THIS   CERTIFICATE  HAVE  NOT  BEEN
REGISTERED  UNDER  THE  SECURITIES  ACT OF 1933,  AND  HAVE  BEEN  ACQUIRED  FOR
INVESTMENT  AND  NOT  WITH A  VIEW  TO,  OR IN  CONNECTION  WITH,  THE  SALE  OR
DISTRIBUTION THEREOF. NO SUCH SALE OR DISPOSITION MAY BE

                               Page 21 of 48 Pages

<PAGE>

EFFECTED WITHOUT (A) AN EFFECTIVE REGISTRATION STATEMENT RELATED THERETO, OR (B)
AN OPINION OF COUNSEL FOR THE COMPANY  THAT SUCH  REGISTRATION  IS NOT  REQUIRED
UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE "ACT"), OR (C) FULL COMPLIANCE
WITH THE PROVISIONS OF RULE 144 UNDER THE ACT."

         1.5 Removal of Legends.  Any legend endorsed on a certificate  pursuant
to Section  1.4 hereof  shall be removed  (i) if the shares of the Common  Stock
represented by such certificate shall have been effectively registered under the
Securities Act or otherwise lawfully sold in a public transaction,  (ii) if such
shares may be transferred in compliance with Rule 144(k)  promulgated  under the
Securities  Act, or (iii) if the holder of such shares  shall have  provided the
Company  with an opinion of counsel,  in form and  substance  acceptable  to the
Company,  stating that a public sale,  transfer or assignment of such shares may
be made without registration.

                                    SECTION 2

                  Representations and Warranties of the Company

         The Company hereby represents and warrants to the Purchasers that:

         2.1  Organization.  The Company is a  corporation  duly  organized  and
validly existing under the laws of the State of Delaware and is in good standing
under such laws. The Company has requisite corporate power and authority to own,
lease and operate its  properties  and assets,  and to carry on its  business as
presently conducted and as proposed to be conducted. The Company is qualified to
do business as a foreign corporation in each jurisdiction in which the ownership
of its  property  or the nature of its  business  requires  such  qualification,
except where failure to so qualify would not have a materially adverse effect on
the Company.

         2.2  Authorization.  The Company  has all  corporate  right,  power and
authority to enter into this  Agreement and the  Registration  Rights  Agreement
substantially in the form attached hereto as Exhibit A (the "Registration Rights
Agreement") and to consummate the transactions  contemplated hereby and thereby.
All corporate action on the part of the Company,  its directors and stockholders
necessary for the  authorization,  execution,  delivery and  performance of this
Agreement  and  the  Registration  Rights  Agreement  by the  Company,  and  the
authorization,  sale,  issuance  and  delivery  of  the  Common  Stock  and  the
performance of the Company's  obligations  hereunder and under the  Registration
Rights  Agreement has been taken.  This  Agreement and the  Registration  Rights
Agreement  have been duly executed and  delivered by the Company and  constitute
legal,  valid and binding  obligations of the Company  enforceable in accordance
with their respective terms,  subject to laws of general application relating to
bankruptcy,  insolvency  and the  relief of debtors  and rules of law  governing
specific  performance,  injunctive  relief or other equitable  remedies,  and to
limitations  of  public  policy  as  they  may  apply  to  Section  1.6  of  the
Registration  Rights  Agreement.  Upon  issuance and  delivery  pursuant to this
Agreement,  all of the Common Stock will be duly and validly issued,  fully paid
and nonassessable and free and clear of any liens and encumbrances. There are no
statutory,  contractual  or other  preemptive  rights or rights of first refusal
with respect to the issuance and sale of the Common Stock.

                              Page 22 of 48 Pages

<PAGE>

         2.3 Validity of  Securities.  The Common Stock,  when issued,  sold and
delivered by the Company in accordance with the terms of this Agreement, will be
duly and validly issued,  fully-paid and nonassessable.  The issuance,  sale and
delivery of the Common Stock are not subject to preemptive or any similar rights
of the Stockholders of the Company or any liens or encumbrances  arising through
the Company.  Based in part upon the  representations  of the Purchasers in this
Agreement,  the offer,  sale and  issuance  of the Common  Stock will be made in
compliance with all applicable federal and state securities laws.

         2.4  Capitalization.  The  authorized  capital  stock  of  the  Company
consists of  50,000,000  shares of Common Stock,  $0.001 par value,  of which at
March 31, 1998,  13,518,150  shares were issued and  outstanding,  and 5,000,000
shares of Preferred  Stock,  $0.001 par value.  The Company's Board of Directors
has  authorized  the creation of 90,000  shares of Series B Preferred  Stock for
potential issuance under the Company's  stockholder rights plan. Since March 31,
1998 no shares of the  Company's  Common or  Preferred  Stock have been  issued,
except  pursuant to the exercise of options or warrants  outstanding as of March
31, 1998. All such issued and  outstanding  shares have been duly authorized and
validly  issued  and are  fully  paid  and  nonassessable.  In  addition  to the
foregoing,  the Company has reserved and  outstanding  the  following  warrants,
rights,  options and  convertible  securities:  (i) warrants for the purchase of
18,395  shares of Common  Stock at an exercise  price of $4.89 per share,  which
warrants  expire in February  2001;  (ii)  warrants  for the  purchase of 22,728
shares of Common Stock at an exercise price of $11.00 per share,  which warrants
expire in December  2000;  (iii)  warrants for the purchase of 73,071  shares of
Common Stock at an exercise price of $5.78,  which  warrants  expire in December
2002;  (iv)  warrants  for the  purchase of 20,000  shares of Common Stock at an
exercise price of $7.43 per share, which warrants expire in December,  2001; (v)
warrants for the purchase of 250,000 shares of Common Stock at an exercise price
of $8.25 per share, which warrants expire in January 2002; (vi) warrants for the
purchase of 905,000  shares of Common  Stock at an  exercise  price of $9.08 per
share,  which warrants  expire in May, 2001;  (vii) warrants for the purchase of
6,000  shares of Common  Stock at an  exercise  price of $6.00 per share,  which
warrants expire in January,  2003; (viii) 2,600,000 shares reserved for issuance
pursuant  to the  Company's  1994 Stock Plan  (including  an increase of 600,000
shares  which is subject to  stockholder  approval at the annual  meeting of the
Company's stockholders to be held on May 22, 1998), of which, at March 31, 1998,
options (net of  repurchases)  to purchase  311,289  shares had been  exercised,
options to  purchase  1,779,405  shares  were  outstanding  and  509,306  shares
remained  available for future grant;  (ix) 500,000 shares reserved for issuance
pursuant to the  Company's  1995  Employee  Stock  Purchase  Plan  (including an
increase  of 400,000  shares  which is subject to  stockholder  approval  at the
annual  meeting of the Company's  stockholders  to be held on May 22, 1998),  of
which,  at March 31, 1998,  53,853  shares had been issued;  (x) 250,000  shares
reserved for issuance  under the  Company's  1995  Directors'  Stock Option Plan
(including  an  increase  of 490,000  shares  which is  subject  to  stockholder
approval at the annual meeting of the Company's  stockholders  to be held on May
22, 1998),  of which, at March 31, 1998,  105,000 options had been granted;  and
(xi) a  commitment  from  Kepler  Capital  LLC to  purchase up to $25 million of
Common Stock over a three-year  period  beginning on or before December 1, 1997.
In  addition,  the  Company  may be  obligated  to issue  additional  shares  to
SmithKline  Beecham  Corporation on April 10, 1998 as part of the  consideration
paid for the  Company's  acquisition  of rights to  Ridaura in  December,  1996.
Except as described in this Section 2.2, there are no other  options,  warrants,
conversion  privileges or other  contractual  rights  presently  outstanding  to
purchase  or  otherwise  acquire  any  authorized  but  unissued  shares  of the
Company's capital stock

                              Page 23 of 48 Pages

<PAGE>

or other securities. All of the issued and outstanding securities of the Company
have been issued in compliance with all applicable  federal and state securities
laws.

         2.5 No Conflict.  The execution and delivery of this  Agreement and the
Registration  Rights  Agreement do not, and the consummation of the transactions
contemplated  hereby  and  thereby  will not,  conflict  with,  or result in any
violation of, or default (with or without notice or lapse of time, or both),  or
give  rise  to a right  of  termination,  cancellation  or  acceleration  of any
obligation  or to a loss of a material  benefit,  under,  any  provision  of the
Certificate  of  Incorporation  or  Bylaws  of  the  Company  or  any  mortgage,
indenture,   lease  or  other  agreement  or  instrument,   permit,  concession,
franchise,  license,  judgment,  order, decree, statute, law, ordinance, rule or
regulation  applicable to the Company, its properties or assets, which conflict,
violation,  default  or  right  would  have a  material  adverse  effect  on the
business, properties, prospects or financial condition of the Company.

         2.6 Accuracy of Reports;  Financial Statements. All reports required to
be filed with the Securities and Exchange  Commission (the "SEC") by the Company
from  February  1, 1996  (the date of the  Company's  initial  public  offering)
through the date of this Agreement under the Securities Exchange Act of 1934, as
amended (the "Exchange  Act"),  copies of which have been made available to each
Purchaser  (the  "SEC  Documents"),  have been duly and  timely  filed,  were in
substantial  compliance  with the  requirements of their  respective  forms when
filed,  were  complete and correct in all  material  respects as of the dates at
which the information was furnished,  and contained (as of such dates) no untrue
statement of a material fact nor omitted to state a material  fact  necessary in
order to make the statements made therein in light of the circumstances in which
made not misleading. The financial statements of the Company included in the SEC
Documents  (the  "Financial  Statements")  comply  as to  form  in all  material
respects with applicable  accounting  requirements  and with the published rules
and regulations of the SEC with respect thereto.  The Financial  Statements have
been  prepared in  accordance  with  generally  accepted  accounting  principles
consistently  applied and fairly present the consolidated  financial position of
the  Company and any  subsidiaries  at the dates  thereof  and the  consolidated
results of  operations  and  consolidated  cash flows for the periods then ended
(subject,   in  the  case  of  unaudited   statements,   to  normal,   recurring
adjustments).

         2.7  Changes.  Since March 20, 1998,  (the date on which the  Company's
Annual  Report on Form 10-K for the year ended  December 31, 1997 was filed with
the SEC),  there has not been (a) any  incurrence by the Company of any material
liability,  absolute  or  contingent,  or (b)  any  event  or  condition  of any
character  that has materially  and adversely  affected or might  materially and
adversely affect the business,  properties,  prospects or financial condition of
the Company (as such business is presently conducted and as it is proposed to be
conducted). There is no material liability or contingency of the Company that is
not disclosed in the SEC Documents.

         2.8 Governmental Consents,  etc. No consent,  approval or authorization
of or designation,  declaration or filing with any governmental authority on the
part of the Company is  required  in  connection  with the valid  execution  and
delivery  of  this  Agreement  or  the  Registration  Rights  Agreement,  or the
consummation of any other transaction  contemplated  hereby and thereby,  except
such  filings  as  may be  required  to be  made  with  the  SEC,  the  National
Association  of  Securities   Dealers,   Inc.  ("NASD")  and  with  governmental
authorities for

                                 24 of 48 Pages

<PAGE>

purposes of effecting  compliance  with the  securities and blue sky laws in the
states in which Common Stock is offered and/or sold,  which  compliance  will be
effected in accordance with such laws.

         2.9  Litigation.  There is no pending or, to the best of the  Company's
knowledge,  threatened lawsuit,  administrative proceeding,  arbitration,  labor
dispute or governmental  investigation  ("Litigation") to which the Company is a
party or by which any material  portion of its assets,  taken as a whole, may be
bound,  nor is the Company aware of any basis  therefor,  which  Litigation,  if
adversely  determined,  would have a material  adverse  effect on the  business,
properties, prospects or financial condition of the Company.

         2.10 Intellectual  Property. To its knowledge,  and except as disclosed
in the SEC Documents,  the Company owns or possesses  sufficient legal rights to
all patents, trademarks,  service marks, tradenames,  copyrights, trade secrets,
licenses,  information  and proprietary  rights and processes  necessary for its
business as now conducted and as proposed to be conducted,  without infringement
of any rights of a third party. The Company has not received any  communications
alleging  that the  Company  has  violated  or, by  conducting  its  business as
proposed,  would  violate  any  of  the  patents,  trademarks,   service  marks,
tradenames,  copyrights,  trade secrets or other proprietary rights or processes
of any other person or entity,  which  violation  would have a material  adverse
effect on the  business,  properties,  prospects or  financial  condition of the
Company.  Except as disclosed in the SEC Documents,  the Company has not granted
(nor has the Company  licensed  from a third  party) any  material  rights to or
licenses to its patents,  trademarks,  service  marks,  tradenames,  copyrights,
trade secrets or other proprietary rights or processes.

         2.11 Registration Rights. Except as provided in the Registration Rights
Agreement and as disclosed in the SEC Documents,  the Company has not granted or
agreed to grant any rights to register its securities  under the Securities Act,
including piggy-back rights, to any person or entity.

         2.12 No Material Default. The Company is not in violation of or default
under any provision of (a) its Certificate of Incorporation or Bylaws or (b) any
mortgage, indenture, lease or other agreement or instrument, permit, concession,
franchise  or  license to which it is a party or by which it is bound or (c) any
federal or state judgment,  order,  decree,  statute,  law,  ordinance,  rule or
regulation applicable to the Company, except with respect to clauses (b) and (c)
above,  such violations or defaults as would not have a material  adverse effect
on the business, properties, prospects or financial condition of the Company.

         2.13 Disclosure. No representation or warranty of the Company contained
in this Agreement or the exhibits  attached hereto (when read together and taken
as a whole),  contains any untrue statement of a material fact or omits to state
a material fact  necessary in order to make the statements  contained  herein or
therein in light of the circumstances under which they were made not misleading.

         2.14 Solvency;  No Default.  As of this date the Company has sufficient
funds and cash flow to pay its debts and other  liabilities  as they become due,
and  the  Company  is not in  default  with  respect  to any  material  debt  or
liability.

                              Page 25 of 48 Pages

<PAGE>

         2.15 Rights of Common  Stock.  The Common  Stock shall have the rights,
preferences,  privileges and restrictions  provided in the Company's Amended and
Restated Certificate of Incorporation.

                                    SECTION 3

                Representations and Warranties of the Purchasers

         Each  Purchaser  hereby  represents  and  warrants  to the  Company  as
follows:

         3.1 Investment.  Purchaser is acquiring the Common Stock for investment
for its own  account,  not as a  nominee  or agent and not with a view to or for
resale in connection with any distribution  thereof.  Purchaser understands that
the Common Stock  purchased by such Purchaser from the Company  pursuant to this
Agreement  has not been  registered  under  the  Securities  Act by  reason of a
specific exemption from the registration  provisions of the Securities Act which
depends  upon,  among other  things,  the bona fide  nature of such  Purchaser's
investment  intent  and the  accuracy  of such  Purchaser's  representations  as
expressed herein.

         3.2 Accredited Investor.  Each Purchaser is an "accredited investor" as
defined  by Rule  501(a)  under the  Securities  Act of 1933,  as  amended  (the
"Securities Act"). The SEC documents have been made available to each Purchaser,
and each Purchaser has received all the  information it has requested  regarding
the Company.  Each  Purchaser has such  business and financial  experience as is
required to give it the capacity to protect its own interests in connection with
the purchase of the Common Stock.

         3.3 Authority.  This Agreement and the  Registration  Rights  Agreement
have been duly executed and delivered by each  Purchaser and  constitute  legal,
valid and binding obligations of the Purchasers,  enforceable in accordance with
their  respective  terms,  subject to laws of general  application  relating  to
bankruptcy,  insolvency  and the  relief of debtors  and rules of law  governing
specific  performance,  injunctive  relief or other equitable  remedies,  and to
limitations  of  public  policy  as  they  may  apply  to  Section  1.6  of  the
Registration Rights Agreement.  The execution and delivery of this Agreement and
the  Registration   Rights  Agreement  do  not,  and  the  consummation  of  the
transactions  contemplated  hereby and thereby will not, conflict with or result
in any violation of any obligation under any judgment,  order, decree,  statute,
law, ordinance, rule or regulation applicable to the Purchasers.

         3.4 Government Consents, etc. No consent,  approval or authorization of
or  designation,  declaration or filing with any  governmental  authority on the
part of the  Purchasers is required in connection  with the valid  execution and
delivery of this Agreement,  or the offer, sale or issuance of the Common Stock,
or the consummation of any other transaction contemplated hereby.

         3.5 Investigation.  Each Purchaser has had a reasonable  opportunity to
discuss the  Company's  business,  management  and  financial  affairs  with the
Company's management.

                              Page 26 of 48 Pages

<PAGE>

                                    SECTION 4

                   Conditions to Obligations of the Purchasers

         The  obligations  of each Purchaser to the Company under this Agreement
are  subject  to the  fulfillment,  on or  before  the  Closing,  of each of the
following conditions, unless otherwise waived:

         4.1  Representations  and Warranties  Correct.  The representations and
warranties  made by the  Company in  Section 2 shall be true and  correct in all
material  respects  on the  Closing  Date with the same  effect  as though  such
representations and warranties had been made on and as of the Closing Date.

         4.2 Covenants.  All covenants,  agreements and conditions  contained in
this  Agreement  to be  performed by the Company on or prior to the Closing Date
shall have been performed or complied with in all material respects.

         4.3 No Order  Pending.  There  shall  not then be in  effect  any order
enjoining or restraining the transactions contemplated by this Agreement.

         4.4 No Law  Prohibiting  or  Restricting  Sale.  There  shall not be in
effect any law,  rule or regulation  prohibiting  or  restricting  such sale, or
requiring  any  consent  or  approval  of any person  which  shall not have been
obtained  to issue the Common  Stock  (except as  otherwise  referenced  in this
Agreement).

         4.5  Compliance  Certificate.  The Company shall have  delivered to the
Purchasers a certificate substantially in the form attached as Exhibit B hereto,
executed by a duly authorized officer, dated the Closing Date, and certifying to
the fulfillment of the conditions specified in Sections 4.1 and 4.2.

         4.6  Registration  Rights  Agreement.  On or before  the  Closing,  the
Company and the  Purchasers  shall have executed and delivered a counterpart  of
the Registration Rights Agreement.

         4.7 Opinion of Company Counsel. The Purchasers shall have received from
Venture  Law  Group,  counsel  for the  Company,  an  opinion  addressed  to the
Purchasers,  dated the  Closing  Date,  in  substantially  the form  attached as
Exhibit C hereto.

                                    SECTION 5

                    Conditions to Obligations of the Company

         The  obligations of the Company under this Agreement are subject to the
fulfillment  on or prior to the  Closing  of each of the  following  conditions,
unless otherwise waived:

         5.1  Representations  and Warranties  Correct.  The representations and
warranties  made by the Purchasers in Section 3 hereof shall be true and correct
in all material respects on

                              Page 27 of 48 Pages

<PAGE>

and as of the Closing  Date with the same effect as though such  representations
and warranties had been made on and as of the Closing Date.

         5.2 Performance. All covenants,  agreements and conditions contained in
this Agreement to be performed by the Purchasers on or prior to the Closing Date
shall have been performed or complied with in all material respects.

         5.3 No Order  Pending.  There  shall  not then be in  effect  any order
enjoining or restraining the transactions contemplated by this Agreement.

         5.4 No Law Prohibiting or Restricting  Such Sale. There shall not be in
effect any law,  rule or regulation  prohibiting  or  restricting  such sale, or
requiring  any  consent  or  approval  of any person  which  shall not have been
obtained  to issue the  Common  Stock  (except  as  otherwise  provided  in this
Agreement).

                                    SECTION 6

                                  Miscellaneous

         6.1  Governing  Law.  This  Agreement  and all  acts  and  transactions
pursuant  hereto and the rights and  obligations  of the parties hereto shall be
governed,  construed and interpreted in accordance with the laws of the State of
California, without giving effect to principles of conflicts of law.

         6.2  Survival.  Unless  otherwise  set  forth  in this  Agreement,  the
warranties,  representations  and  covenants  of the Company and the  Purchasers
contained in or made pursuant to this Agreement  shall survive the execution and
delivery of this Agreement and the Closing.

         6.3  Successors and Assigns.  This Agreement  shall be binding upon and
shall inure to the benefit of the parties hereto and their respective successors
and assigns.

         6.4 Entire  Agreement;  Amendment.  This  Agreement,  the  Registration
Rights Agreement and the other documents  delivered  pursuant hereto  constitute
the full and entire  understanding and agreement between the parties with regard
to the subject matter hereof and thereof and supersede all prior  agreements and
understandings among the parties relating to the subject matter hereof.  Neither
this  Agreement  nor any term  hereof  may be  amended,  waived,  discharged  or
terminated other than by a written  instrument signed by the party against which
enforcement of any such amendment, waiver, discharge or termination is sought.

         6.5 Notices and Dates.  Unless otherwise  provided  herein,  any notice
required or permitted by this Agreement  shall be in writing and shall be deemed
sufficient upon delivery,  when delivered personally or by overnight courier and
addressed  to the party to be notified at such  party's  address as set forth on
the signature page hereto or as subsequently  modified by written notice. In the
event that any date provided for in this Agreement  falls on a Saturday,  Sunday
or legal holiday, such date shall be deemed extended to the next business day.

                              Page 28 of 48 Pages

<PAGE>

         6.6 Brokers.

                  (a) The Company has not engaged,  consented  to or  authorized
any broker, finder or intermediary to act on its behalf, directly or indirectly,
as a  broker,  finder  or  intermediary  in  connection  with  the  transactions
contemplated  by this  Agreement.  The  Company  agrees  to  indemnify  and hold
harmless the Purchasers from and against all fees, commissions or other payments
owing to any party acting on behalf of the Company hereunder.

                  (b) No Purchaser has engaged,  consented to or authorized  any
broker, finder or intermediary to act on its behalf, directly or indirectly,  as
a  broker,   finder  or  intermediary   in  connection  with  the   transactions
contemplated  by this Agreement.  Each Purchaser  hereby agrees to indemnify and
hold  harmless  the  Company  from and against  all fees,  commissions  or other
payments owing to any party acting on behalf of such Purchaser hereunder.

         6.7 Severability.  If any term,  provision,  covenant or restriction of
this Agreement is held by a court of competent  jurisdiction to be invalid, void
or  unenforceable,  the  remainder  of  the  terms,  provisions,  covenants  and
restrictions  of this Agreement  shall remain in full force and effect and shall
in no way be affected, impaired or invalidated.

         6.8  Costs  and  Expenses.  Irrespective  of  whether  the  Closing  is
effected,  the  Company  shall pay all costs and  expenses  that it incurs  with
respect  to  the  negotiation,  execution,  delivery  and  performance  of  this
Agreement.  If the Closing is  effected,  the  Company  shall,  at the  Closing,
reimburse the reasonable fees of Pillsbury  Madison & Sutro LLP, counsel for the
Purchasers,   and  upon  receipt  of  a  bill  therefor,   shall  reimburse  the
out-of-pocket  expenses of such  counsel,  provided  that such fees and expenses
shall not exceed $7,500.

         6.9 No Third Party Rights. Nothing in this Agreement shall create or be
deemed  to  create  any  rights  in any  person  or  entity  not a party to this
Agreement.

         6.10 Captions and  Headings.  The captions and headings used herein are
for  convenience and ease of reference only and are not intended to be a part of
or to affect the meaning or interpretation of this Agreement.

         6.11 Counterparts.  This Agreement may be executed in counterparts, and
each such counterpart shall be deemed an original for all purposes.

                              Page 29 of 48 Pages

<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their respective authorized officers as of the date aforesaid.

                              CONNETICS CORPORATION



                            By: /s/ Thomas G. Wiggans
                                -------------------------------------
                                Thomas G. Wiggans, President

                            Address:

                            3400 West Bayshore Road
                            Palo Alto, CA 94303
                            Facsimile: (650) 843-2899

                            INVESTORS:

                            ALTA BIOPHARMA PARTNERS, L.P.
                            BY:  ALTA BIOPHARMA MANAGEMENT, LLC


                            BY: /s/ Jean Deleage
                                -------------------------------------
                                    MANAGING DIRECTOR

                            ALTA EMBARCADERO BIOPHARMA, LLC


                            BY: /s/ Jean Deleage
                                -------------------------------------
                                    MEMBER

                            CONNETICS PARTNERS (ALTA BIO), LLC
                            BY: ALTA/CHASE BIOPHARMA MANAGEMENT, LLC

                            BY: /s/ Jean Deleage
                                -------------------------------------
                                    MEMBER

                            Address:

                            Alta Partners
                            One Embarcadero Center, Suite 4050
                            San Francisco, CA 94111
                            Facsimile: (415) 362-6178

                              Page 30 of 48 Pages

<PAGE>


                                    EXHIBIT A

                          REGISTRATION RIGHTS AGREEMENT

                              Page 31 of 48 Pages

<PAGE>

                                    EXHIBIT B

                              CONNETICS CORPORATION

                             COMPLIANCE CERTIFICATE


         The undersigned, Thomas G. Wiggans, hereby certifies as follows:

         1. The  undersigned is the duly elected  President and Chief  Executive
Officer of Connetics Corporation, a Delaware corporation (the "Company").

         2. The  representations  and  warranties  of the  Company  set forth in
Section 2 of the Common Stock Purchase  Agreement (the "Agreement")  dated April
10, 1998 are true and correct in all material  respects as though made on and as
of the date hereof.

         3.  The  Company  has  performed  and  complied  with  all   covenants,
agreements,  obligations  and  conditions  contained  in  the  Agreement  to  be
performed by the Company on or prior to the Closing Date.

         The undersigned has executed this  Certificate  this 10th day of April,
1998.




                                         ---------------------------------------
                                         Thomas G. Wiggans, President and Chief
                                         Executive Officer



                               Page 32 of 48 Pages

<PAGE>


                                                                       Exhibit C


                              CONNETICS CORPORATION


                          REGISTRATION RIGHTS AGREEMENT


                                 April 10, 1998


                              Page 33 of 48 Pages

<PAGE>

                              CONNETICS CORPORATION

                          REGISTRATION RIGHTS AGREEMENT

         This Registration  Rights Agreement (the "Agreement") is made as of the
tenth day of  April,  1998,  by and  among  Connetics  Corporation,  a  Delaware
corporation  (the  "Company")  and  Alta  BioPharma  Partners,  L.P.,  Connetics
Partners (Alta Bio), LLC and Alta  Embarcadero  BioPharma,  LLC each of which is
herein referred to as an "Investor."

                                    RECITALS

         WHEREAS, the Company and the Investors have entered into a Common Stock
Purchase Agreement (the "Purchase  Agreement") of even date herewith pursuant to
which the Company has agreed to sell to the  Investors  and the  Investors  have
agreed to purchase from the Company  shares of the  Company's  Common Stock (all
terms not  otherwise  defined  herein  shall have the  meanings  ascribed in the
Purchase Agreement); and

         WHEREAS,  a condition to the Investors'  obligations under the Purchase
Agreement  is that the Company and the  Investors  enter into this  Agreement in
order to provide the Investors  with certain rights to register the Common Stock
acquired  by the  Investors  pursuant  to the  Purchase  Agreement.  The Company
desires to induce the  Investors to purchase  the Common  Stock  pursuant to the
Purchase Agreement by agreeing to the terms and conditions set forth herein;

         NOW, THEREFORE, the parties hereby agree as follows:

                  1.       Registration  Rights.  The Company and the  Investors
covenant and agree as follows:

                           1.1      Definitions. For purposes of this Section 1:

                                    (a)     The terms "register,"  "registered,"
and  "registration"  refer to a registration  effected by preparing and filing a
registration statement or similar document in compliance with the Securities Act
of  1933,  as  amended  (the  "Act"),   and  the   declaration  or  ordering  of
effectiveness of such registration statement or document;

                                    (b)     The  term  "Registrable  Securities"
means (i) the  shares  of Common  Stock  issued or sold in  connection  with the
Purchase  Agreement  (such shares of Common Stock are  collectively  referred to
hereinafter  as the  "Shares"  or "Stock")  and (ii) any other  shares of common
stock of the Company  issued as (or issuable upon the  conversion or exercise of
any  warrant,  right or other  security  which is issued as) a dividend or other
distribution with respect to, or in exchange for or in replacement of, the Stock
provided,  that  the  foregoing  definition  shall  exclude  in  all  cases  any
Registrable  Securities  sold by a person in a  transaction  in which his or her
rights under this  Agreement are not assigned.  Notwithstanding  the  foregoing,
shares of common stock shall only be treated as Registrable Securities if and so
long as they  have not  been  (A) sold to or  through  a  broker  or  dealer  or
underwriter in a public distribution or a public securities transaction,  or (B)
sold in a  transaction  exempt from the  registration  and  prospectus  delivery
requirements of the Act under Section 4(1) thereof so that all

                              Page 34 of 48 Pages

<PAGE>

transfer restrictions, and restrictive legends with respect thereto, if any, are
removed upon the consummation of such sale;

                                    (c)     The number of shares of "Registrable
Securities  then  outstanding"  shall be  determined  by the number of shares of
Common Stock then outstanding which are Registrable Securities,  plus the number
of shares of common stock issuable  pursuant to then  exercisable or convertible
securities which are Registrable Securities;

                                    (d)     The term  "Holder"  means any person
owning or having the right to acquire  Registrable  Securities  or any  assignee
thereof in accordance with this Agreement;

                                    (e)     The term  "Form S-3" means such form
under the Act as in effect on the date  hereof or any  successor  form under the
Act; and

                                    (f)     The term "SEC" means the  Securities
and Exchange Commission.

                           1.2      Registration.   The  Company  will  use  its
reasonable  best  efforts  to effect a  registration  to permit  the sale of the
Registrable  Securities  as described  below,  and pursuant  thereto the Company
will:

                                    (a)     prepare   and   file   and  use  its
reasonable  best  efforts to have  declared  effective by the SEC within 90 days
after the Closing,  a  registration  statement on Form S-3 relating to resale of
all of the shares of the  Registrable  Securities  and use its  reasonable  best
efforts to cause such registration  statement to remain  continuously  effective
for a period which will terminate  when all  Registrable  Securities  covered by
such  registration  statement,  as amended from time to time,  have been sold or
when  the  Registrable  Securities  may be sold  under  Rule  144(k)  under  the
Securities Act.

                                    (b)     prepare  and file  with the SEC such
amendments and post-effective  amendments to the registration  statement and any
prospectus as may be necessary to keep such registration statement effective for
the period  specified in Section 1.2(a) and to comply with the provisions of the
Securities  Act and the  Exchange Act with  respect to the  distribution  of all
Registrable Securities.

                                    (c)     notify each  Investor  promptly  and
confirm  such notice in writing (i) when the  prospectus  or any  supplement  or
post-effective  amendment has been filed and,  with respect to the  registration
statement or any post-effective  amendment,  when the same has become effective,
(ii) of any request by the SEC for amendments or supplements to the registration
statement or prospectus or for additional information,  (iii) of the issuance by
the SEC of any stop  order  suspending  the  effectiveness  of the  registration
statement or the initiation of any proceedings for that purpose, and (iv) of the
receipt by the Company of any notification with respect to the suspension of the
qualification of the Registrable  Securities for sale in any jurisdiction or the
initiation or threatening of any proceeding for such purpose.

                              Page 35 of 48 Pages

<PAGE>


(d)  make  every  reasonable  effort  to  obtain  the  withdrawal  of any  order
suspending  the  effectiveness  of the  registration  statement  at the earliest
possible moment.

                                    (e)     furnish  to each  Investor,  without
charge, at least one copy of the registration  statement and any  post-effective
amendment thereto,  including  financial  statements and schedules,  and upon an
Investor's  request,  all  documents  incorporated  therein by reference and all
exhibits thereto (including those incorporated by reference).

                                    (f)     deliver  to each  Investor,  without
charge, as many copies of the prospectus (including each preliminary prospectus)
and any amendment or supplement  thereto as such Investor may reasonably request
in order to facilitate the disposition of the Registrable Securities.

                                    (g)     cause  all  Registrable   Securities
covered by the registration  statement to be listed on each securities  exchange
or market on which similar securities issued by the Company are then listed, and
if the securities are not so listed to use its reasonable best efforts  promptly
to cause all such securities to be listed on either the New York Stock Exchange,
the American Stock Exchange or the Nasdaq Stock Market.

                                    (h)     use   reasonable   best  efforts  to
qualify  or  register  the  Registrable  Securities  for sale  under (or  obtain
exemptions from the application of) the Blue Sky laws of such  jurisdictions  as
are  applicable.  The  Company  shall not be  required  to  qualify as a foreign
corporation  or to file a general  consent  to  service  of  process in any such
jurisdiction where it is not presently qualified or where it would be subject to
general  service  of  process  or  taxation  as a  foreign  corporation  in  any
jurisdiction where it is not now so subject.

                                    (i)     otherwise  use its  reasonable  best
efforts to comply with all applicable rules and regulations of the SEC under the
Securities  Act and the  Exchange  Act and take  such  other  actions  as may be
reasonably   necessary  to  facilitate  the   registration  of  the  Registrable
Securities hereunder.

                                    (j)     expenses incurred in connection with
a  registration  requested  pursuant  to this  Section 1.2 shall be borne by the
Company,  including  all  registration,  filing,  qualification,  printers'  and
accounting fees but excluding any underwriters' discounts or commissions and any
fees and  disbursements  of any counsel for the  selling  Holders  (such fees or
discounts,  if any,  to be borne pro rata by the  Holders  participating  in the
registration).

                           1.3      Restrictions  on  and  Procedure  for  Sales
                                    Pursuant to a Registration Statement.

                                    (a)     Each Holder agrees to the following:

                                            (i)       Notice to Company.  If any
Holder shall propose to sell any Shares,  the Holder shall notify the Company of
its intent to do so at least three (3)  business  days prior to the date of such
sale (the  "Notice of  Sale"),  and the  provision  of the Notice of Sale to the
Company shall conclusively be deemed to establish an agreement by such Holder to
comply with the registration  provisions  herein  described.  The Notice of Sale
shall be deemed

                               Page 36 of 48 Pages

<PAGE>

to constitute a representation that any information  previously supplied by such
Holder is accurate as of the date of such Notice of Sale.

                                            (ii)      Notice of Sale. The Notice
of Sale in  substantially  the form  attached as  Attachment A shall be given in
accordance  with the provisions of Section 2.5 hereof.  However,  the Holder may
give the  Notice  of Sale  orally by  telephoning  John L.  Higgins  or the then
current Chief Financial Officer at the Company at (650) 843-2800. An oral Notice
of Sale shall be deemed to have been  received  only at such time as the Selling
Holder  speaks  directly  with  John L.  Higgins  (or such  then  current  Chief
Financial  Officer).  In  addition,  an oral Notice of Sale shall only be deemed
effective if it is followed by a written  Notice of Sale received by the Company
by personal delivery or facsimile within twenty-four (24) hours after giving the
oral Notice of Sale.

                                            (iii)     Delay of Sale. The Company
may refuse to permit the Holder to resell any Shares for a  specified  period of
time; provided,  however,  that (a) in order to exercise this right, the Company
must  deliver a  certificate  in writing  to the  Holder to the effect  that the
registration  statement in its then current form contains an untrue statement of
material fact or omits to state a material  fact  necessary in order to make the
statements  made therein,  in light of the  circumstances  under which they were
made, not  misleading,  and (b) in no event shall such delay exceed  twenty-five
(25) days,  and (c) in no event shall this right of delay be  exercised  on more
than two (2) occasions in any twelve (12) month period. During any suspension as
contemplated by this Section 1.4 (a)(iii), the Company will not allow any of its
officers or directors to buy or sell shares of the Company's securities.

                                    (b)     Representations  of  Holders.   Each
Holder  hereby  represents to and  covenants  with the Company that,  during the
period in which a  registration  statement  effected  pursuant  to  Section  1.2
remains effective, such Holder will:

                                            (i)       not    engage    in    any
stabilization activity in connection with any of the Company's securities;

                                            (ii)      cause to be  furnished  to
any  purchaser  of the Shares and to the  broker-dealer,  if any,  through  whom
Shares may be offered, a copy of the Prospectus; and

                                            (iii)     not  bid  for or  purchase
any securities of the Company or any rights to acquire the Company's securities,
or attempt to induce any person to purchase any of the  Company's  securities or
any rights to acquire the Company's securities other than as permitted under the
Securities Exchange Act of 1934, as amended ("Exchange Act").

                                    (c)     Information  for Use in Registration
Statement.  Each Holder  represents and warrants to the Company that such Holder
has completed the information  requested by the Selling  Holder's  Questionnaire
attached as Attachment B hereto (the  "Questionnaire"),  and further  represents
and warrants to the Company that all information  provided by such Holder in the
Questionnaire is true,  accurate and complete.  Each Holder understands that the
written information in the Questionnaire and all written representations

                               Page 37 of 48 Pages

<PAGE>

made in this  Agreement are being provided to the Company  specifically  for use
in, or in connection  with, the registration  statement and the Prospectus,  and
has executed this Agreement with such knowledge.

                           1.4      Furnish Information. It shall be a condition
precedent to the  obligations of the Company to take any action pursuant to this
Section 1 with respect to the Registrable  Securities of any selling Holder that
such Holder shall furnish to the Company such information  regarding itself, the
Registrable  Securities  held by it, and the intended  method of  disposition of
such securities as shall be required to effect the registration of such Holder's
Registrable Securities.

                           1.5      Delay of Registration.  No Holder shall have
any right to obtain or seek an injunction  restraining or otherwise delaying any
such  registration as the result of any dispute that might arise with respect to
the interpretation or implementation of this Section 1.

                           1.6      Indemnification.    In   the    event    any
Registrable  Securities  are  included in a  registration  statement  under this
Section 1:

                                    (a)     To the extent  permitted by law, the
Company will  indemnify  and hold  harmless  each Holder,  any  underwriter  (as
defined in the Act) for such Holder and each person,  if any, who controls  such
Holder or underwriter within the meaning of the Act or the Exchange Act, against
any losses, claims, damages, or liabilities (joint or several) to which they may
become  subject  under the Act, the Exchange Act or other  federal or state law,
insofar as such losses,  claims,  damages, or liabilities (or actions in respect
thereof)  arise  out of or are  based  upon  any  of the  following  statements,
omissions or violations  (collectively a "Violation"):  (i) any untrue statement
or alleged untrue  statement of a material fact  contained in such  registration
statement,  including any preliminary  prospectus or final prospectus  contained
therein or any amendments or supplements  thereto,  (ii) the omission or alleged
omission to state  therein a material  fact  required to be stated  therein,  or
necessary to make the statements therein not misleading,  or (iii) any violation
or alleged  violation  by the Company of the Act,  the  Exchange  Act, any state
securities law or any rule or regulation promulgated under the Act, the Exchange
Act or any state  securities  law; and the Company will pay to each such Holder,
underwriter  or  controlling  person,  as incurred,  any legal or other expenses
reasonably  incurred by them in connection with  investigating  or defending any
such loss, claim, damage,  liability,  or action;  provided,  however,  that the
indemnity  agreement  contained  in this  subsection  1.6(a)  shall not apply to
amounts paid in settlement of any such loss, claim, damage, liability, or action
if such settlement is effected without the consent of the Company (which consent
shall not be unreasonably withheld), nor shall the Company be liable in any such
case for any such loss, claim, damage,  liability,  or action to the extent that
it arises out of or is based upon a Violation  which occurs in reliance upon and
in conformity with written information furnished expressly for use in connection
with such registration by any such Holder, underwriter or controlling person.

                                    (b)     To the extent permitted by law, each
selling  Holder  will  indemnify  and hold  harmless  the  Company,  each of its
directors,  each of its officers who has signed the registration statement, each
person,  if any,  who  controls  the Company  within the meaning of the Act, any
underwriter,  any other Holder selling securities in such registration statement
and any controlling person of any such underwriter or other Holder, against any

                               Page 38 of 48 Pages

<PAGE>

losses,  claims,  damages, or liabilities (joint or several) to which any of the
foregoing  persons may become subject,  under the Act, the Exchange Act or other
federal or state law, insofar as such losses,  claims,  damages,  or liabilities
(or actions in respect thereto) arise out of or are based upon any Violation, in
each case to the extent (and only to the extent) that such  Violation  occurs in
reliance  upon and in  conformity  with  written  information  furnished by such
Holder  expressly for use in connection  with such  registration;  and each such
Holder will pay, as incurred, any legal or other expenses reasonably incurred by
any person  intended to be indemnified  pursuant to this subsection  1.6(b),  in
connection  with  investigating  or  defending  any such  loss,  claim,  damage,
liability, or action; provided,  however, that the indemnity agreement contained
in this  subsection  1.6(b) shall not apply to amounts paid in settlement of any
such loss,  claim,  damage,  liability or action if such  settlement is effected
without the  consent of the  Holder,  which  consent  shall not be  unreasonably
withheld;  provided, that, in no event shall any indemnity under this subsection
1.6(b) exceed the net proceeds from the offering received by such Holder, except
in the case of willful fraud by such Holder.

                                    (c)     Promptly   after   receipt   by   an
indemnified  party under this Section 1.6 of notice of the  commencement  of any
action  (including any governmental  action),  such indemnified party will, if a
claim in respect thereof is to be made against any indemnifying party under this
Section  1.6,  deliver  to  the  indemnifying  party  a  written  notice  of the
commencement  thereof  and the  indemnifying  party  shall  have  the  right  to
participate in, and, to the extent the  indemnifying  party so desires,  jointly
with any other  indemnifying  party  similarly  noticed,  to assume the  defense
thereof with counsel mutually  satisfactory to the parties;  provided,  however,
that an indemnified party (together with all other indemnified parties which may
be represented  without  conflict by one counsel) shall have the right to retain
one separate  counsel,  with the reasonable  fees and expenses to be paid by the
indemnifying  party, if  representation of such indemnified party by the counsel
retained  by the  indemnifying  party  would be  inappropriate  due to actual or
potential differing interests between such indemnified party and any other party
represented by such counsel in such  proceeding.  The failure to deliver written
notice to the indemnifying party within a reasonable time of the commencement of
any such action,  if  prejudicial  to its ability to defend such  action,  shall
relieve such indemnifying  party of any liability to the indemnified party under
this  Section  1.6,  but  the  omission  so to  deliver  written  notice  to the
indemnifying  party will not relieve it of any liability that it may have to any
indemnified party otherwise than under this Section 1.6.

                                      (d)   If the indemnification  provided for
in  this  Section  1.6 is  held  by a  court  of  competent  jurisdiction  to be
unavailable to an indemnified party with respect to any loss, liability,  claim,
damage, or expense referred to therein,  then the indemnifying party, in lieu of
indemnifying  such indemnified  party hereunder,  shall contribute to the amount
paid or payable by such indemnified  party as a result of such loss,  liability,
claim,  damage,  or expense in such  proportion as is appropriate to reflect the
relative fault of the indemnifying  party on the one hand and of the indemnified
party on the other in connection  with the statements or omissions that resulted
in such loss, liability, claim, damage, or expense as well as any other relevant
equitable considerations;  provided, that, in no event shall any contribution by
a Holder under this Subsection  1.6(d) exceed the net proceeds from the offering
received by such Holder, except in the case of willful fraud by such Holder. The
relative fault of the indemnifying  party and of the indemnified  party shall be
determined by reference  to, among other  things,  whether the untrue or alleged
untrue statement of a material fact or the omission to state a material fact

                              Page 39 of 48 Pages

<PAGE>

relates to information  supplied by the indemnifying party or by the indemnified
party and the parties' relative intent,  knowledge,  access to information,  and
opportunity to correct or prevent such statement or omission.

                                    (e)     The  obligations  of the Company and
Holders under this Section 1.6 shall  survive the  completion of any offering of
Registrable Securities in a registration statement under this Section 1.

                           1.7      Reports  Under  Securities  Exchange  Act of
1934.  With a view to making  available  to the Holders the benefits of Rule 144
and any other rule or regulation of the SEC that may at any time permit a Holder
to sell securities of the Company to the public without registration or pursuant
to a registration on Form S-3, the Company agrees to:

                                    (a)     make  and  keep  public  information
available, as those terms are understood and defined in Rule 144, so long as the
Company remains subject to the periodic reporting requirements under Sections 13
or 15(d) of the Exchange Act;

                                    (b)     take  such  action,   including  the
voluntary registration of its Common Stock under Section 12 of the Exchange Act,
as is  necessary to enable the Holders to utilize Form S-3 for the sale of their
Registrable Securities;

                                    (c)     file with the SEC in a timely manner
all reports and other  documents  required of the Company  under the Act and the
Exchange Act; and

                                    (d)     furnish  to any  Holder,  so long as
the Holder owns any Registrable Securities, forthwith upon request (i) a written
statement by the Company that it has complied with the reporting requirements of
the Exchange Act and the rules and regulations promulgated  thereunder,  or that
it qualifies as a registrant  whose  securities  may be resold  pursuant to Form
S-3,  (ii) a copy of the most recent  annual or quarterly  report of the Company
and such other  reports and  documents so filed by the  Company,  and (iii) such
other  information as may be reasonably  requested in availing any Holder of any
rule or regulation  of the SEC which permits the selling of any such  securities
without registration or pursuant to such form.

                  1.8 Assignment of Registration Rights. The rights to cause the
Company to register  Registrable  Securities  pursuant to this  Section 1 may be
assigned (but only with all related  obligations) by a Holder to a transferee or
assignee of at least 500,000  shares of such  securities  (as adjusted for stock
splits,  stock  dividends  and the  like)  or,  if  less,  all of such  Holder's
Registrable  Securities,  provided in either case that the Company is,  within a
reasonable  time after such transfer,  furnished with written notice of the name
and address of such  transferee or assignee and the  securities  with respect to
which such registration rights are being assigned;  and provided,  further, that
such assignment  shall be effective only if immediately  following such transfer
the further  disposition  of such  securities  by the  transferee or assignee is
restricted  under the Act. For the purposes of determining  the number of shares
of  Registrable  Securities  held by a transferee  or assignee,  the holdings of
transferees and assignees of a partnership who are partners or retired  partners
of such partnership  (including  spouses and ancestors,  lineal  descendants and
siblings of such partners or spouses who acquire Registrable Securities by gift,
will or  intestate  succession)  shall  be  aggregated  together  and  with  the
partnership;  provided that

                               Page 40 of 48 Pages

<PAGE>

all assignees and transferees who would not qualify  individually for assignment
of registration rights shall have a single  attorney-in-fact  for the purpose of
exercising any rights, receiving notices or taking any action under Section 1.

                  1.9 No Other Registration  Rights. This Agreement shall not be
construed to grant the Investors  "piggy-back"  registration rights or any other
right to have their securities registered under the Act, except as expressly set
forth in Section 1.2 hereof.

                  2.  Miscellaneous.

                           2.1      Successors and Assigns.  Except as otherwise
provided  herein,  the terms and conditions of this Agreement shall inure to the
benefit of and be binding  upon the  respective  successors  and  assigns of the
parties (including transferees of any of the Shares). Nothing in this Agreement,
express or implied,  is intended to confer upon any party other than the parties
hereto  or  their  respective  successors  and  assigns  any  rights,  remedies,
obligations,  or  liabilities  under or by reason of this  Agreement,  except as
expressly provided in this Agreement.

                           2.2      Governing  Law. This  Agreement and all acts
and transactions pursuant hereto shall be governed, construed and interpreted in
accordance  with the laws of the State of  California,  without giving effect to
principles of conflicts of laws.

                           2.3      Counterparts. This Agreement may be executed
in two (2) or more counterparts,  each of which shall be deemed an original, but
all of which together shall constitute one and the same instrument.

                           2.4      Titles   and   Subtitles.   The  titles  and
subtitles used in this Agreement are used for convenience only and are not to be
considered in construing or interpreting this Agreement.

                           2.5      Notices.  Unless otherwise  provided herein,
any notice required or permitted by this Agreement shall be in writing and shall
be deemed  sufficient upon delivery,  when delivered  personally or by overnight
courier and addressed to the party to be notified at such party's address as set
forth on the  signature  page  hereto or as  subsequently  modified  by  written
notice.  In the event that any date  provided for in this  Agreement  falls on a
Saturday,  Sunday or legal  holiday,  such date shall be deemed  extended to the
next business day.  Notwithstanding the foregoing, any notice delivered pursuant
to Section  1.3(e) or Section 1.4 hereto  must be made by  personal  delivery or
confirmed facsimile transmission.

                           2.6      Expenses.  If any action at law or in equity
is necessary to enforce or interpret the terms of this Agreement, the prevailing
party shall be entitled  to  reasonable  attorneys'  fees,  costs and  necessary
disbursements  in  addition  to any  other  relief  to which  such  party may be
entitled.

                           2.7      Amendments  and  Waivers.  Any  term of this
Agreement may be amended and the observance of any term of this Agreement may be
waived (either generally or in a particular instance and either retroactively or
prospectively),  only with the written consent of the Company and the holders of
a majority of the  Registrable  Securities  then  outstanding.  Any amendment or
waiver effected in accordance with this paragraph shall be binding upon each

                              Page 41 of 48 Pages

<PAGE>

holder of any Registrable Securities then outstanding, each future holder of all
such Registrable Securities, and the Company.

                           2.8      Severability.  If one or more  provisions of
this Agreement are held to be  unenforceable  under  applicable law, the parties
agree to renegotiate such provision in good faith. In the event that the parties
cannot  reach  a  mutually  agreeable  and  enforceable   replacement  for  such
provision,  then (x) such provision shall be excluded from this  Agreement,  (y)
the balance of the Agreement  shall be  interpreted as if such provision were so
excluded and (z) the balance of the Agreement shall be enforceable in accordance
with its terms.

                           2.9      Entire  Agreement.  This Agreement,  and the
documents referred to herein (with the exception of the registration  statement)
constitute the entire  agreement  between the parties  hereto  pertaining to the
subject matter hereof, and any and all other written or oral agreements existing
between the parties hereto are expressly canceled.

                              Page 42 of 48 Pages

<PAGE>

         The parties have executed this Registration  Rights Agreement as of the
date first above written.

                              COMPANY:

                              CONNETICS CORPORATION


                              By: /s/ Thomas G. Wiggans
                                  ------------------------------------
                              Thomas G. Wiggans, President

                              Address:

                              3400 West Bayshore Road
                              Palo Alto, CA 94303
                              Facsimile: (650) 843-2899

                              INVESTORS:

                              ALTA BIOPHARMA PARTNERS, L.P.
                              BY:  ALTA BIOPHARMA MANAGEMENT, LLC


                              BY: /s/ Jean Deleage
                                  ------------------------------------
                                        MANAGING DIRECTOR

                              ALTA EMBARCADERO BIOPHARMA, LLC


                              BY: /s/ Jean Deleage
                                  ------------------------------------
                                      MEMBER

                              CONNETICS PARTNERS (ALTA BIO), LLC
                              BY: ALTA/CHASE BIOPHARMA MANAGEMENT, LLC

                              BY: /s/ Jean Deleage
                                  ------------------------------------
                                      MEMBER

                              Address:

                              Alta Partners
                              One Embarcadero Center, Suite 4050
                              San Francisco, CA 94111
                              Facsimile: (415) 362-6178


                               Page 43 of 48 Pages

<PAGE>

                                  Attachment A



                              CONNETICS CORPORATION

                                 NOTICE OF SALE



         Pursuant to the  Registration  Rights  Agreement  dated as of April 10,
1998 among Connetics  Corporation (the  "Company"),  the undersigned and certain
stockholders of the Company,  the undersigned hereby gives notice to the Company
of the undersigned's intent to sell _______ shares of the Company's Common Stock
registered  pursuant  to the  registration  statement  (File  No._______)  filed
pursuant to such Agreement.



Dated:___________________             By:_________________________________
                                                     (signature)


                                      Name:_______________________________
                                                       (print)


                                      Title:______________________________
                                                     (if applicable)




[Note:  This  Notice of Sale  must be  completed  and  delivered  (via  personal
delivery or facsimile) to the Chief Financial Officer of the Company on or three
(3) business day before the date of sale of the shares of the  Company's  Common
Stock registered pursuant to the Registration Statement.]


                              Page 44 of 48 Pages

<PAGE>

                                  Attachment B

                              CONNETICS CORPORATION
                       SELLING STOCKHOLDER'S QUESTIONNAIRE

         In  connection   with  the  Connetics   Corporation   (the   "Company")
Registration  Statement  (File  No.______ )  registering  certain  shares of the
Company's  Common  Stock,  the  undersigned  represents  and  warrants  that the
information set forth below is true, accurate and complete:


         1. As of the date  hereof,  the  undersigned  beneficially  owns ______
shares of the Company's Common Stock.

         2. Except as described  below,  the  undersigned has not had a material
relationship  with the Company or any of its  predecessors or affiliates  within
the last three years.

         The term "material relationship" has not been defined by the Securities
and Exchange Commission (the "SEC"). However, the SEC has indicated that it will
probably construe as a "material  relationship" any relationship  which tends to
prevent arms length bargaining in dealings with a company,  whether arising from
a close business connection or family relationship, a relationship of control or
otherwise.  It seems prudent,  therefore, to consider that the undersigned would
have  such a  relationship,  for  example,  with any  organization  of which the
undersigned  is an  officer,  director,  trustee  or  partner  or in  which  the
undersigned  owns,  directly or  indirectly,  ten  percent  (10%) or more of the
outstanding voting stock, or in which the undersigned has some other substantial
interest,  and with any person or organization with whom the undersigned has, or
with whom any  relative  or spouse (or any other  person or  organization  as to
which the  undersigned  has any of the  foregoing  other  relationships)  has, a
contractual relationship.

         If  applicable,  please  describe  the material  relationship  with the
Company:

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________

________________________________________________________________________________

 Dated:___________________               By:____________________________________
                                                          (signature)


                                         Name:__________________________________
                                                            (print)


                                         Title:_________________________________
                                                         (if applicable)


                              Page 45 of 48 Pages

<PAGE>

                                                                       Exhibit D


                   ALTA BIOPHARMA PARTNERS LIMITED PARTNERSHIP
              MANAGEMENT RIGHTS, INVESTMENTS IN CERTAIN COUNTRIES,
                   INDEMNIFICATION AND SUPERFUND REQUIREMENTS


                                MANAGEMENT RIGHTS

         The Investor,  Alta BioPharma  Partners,  L.P.,  requires the following
contractual  management  rights,  in addition to rights to  nonpublic  financial
information,  inspection rights, and other rights  specifically  provided to all
investors:

1.       Investor  shall be  entitled  to  reasonably  consult  with and  advise
         management of the Company on  significant  business  issues,  including
         management's  proposed annual operating plans, and management will meet
         with Investor regularly during each year at the Company's facilities at
         mutually agreeable times for such consultation and advice and to review
         progress in achieving said plans.

2.       Investor  may  examine the books and records of the Company and inspect
         its  facilities  and may request  information  at reasonable  times and
         intervals  concerning  the general  status of the  Company's  financial
         condition and operations,  provided that access to highly  confidential
         proprietary information and facilities need not be provided.

3.       If Investor is not represented on the Company's Board of Directors, the
         Company  shall  invite a  representative  of the Investor to attend all
         meetings of its Board of  Directors in a nonvoting  observer  capacity,
         and in this  respect  shall  give  such  representative  copies  of all
         notices,  minutes,  consents and other material that it provides to its
         directors;  provided,  however,  that the Company reserves the right to
         exclude such  representative  from access to any material or meeting or
         portion  thereof if the Company  believes  upon advice of counsel  that
         such exclusion is reasonably  necessary to preserve the attorney-client
         privilege,  to protect highly confidential  proprietary  information or
         for other similar  reasons.  Such  representative  may  participate  in
         discussions of matters brought to the Board.

         Investor agrees,  and any representative of the Investor will agree, to
hold  in  confidence  and  trust  and  not  use  or  disclose  any  confidential
information provided to or learned by it in connection with its rights.

         The rights described herein are  nonassignable  and shall terminate and
be of no further  force or effect  when the  Investor  no longer  holds at least
800,000  shares of the  Company's  Common Stock (as  adjusted for stock  splits,
stock dividends,  recapitalizations  and the like), provided that if, prior to a
transaction  which would  cause the  expiration  of such rights  pursuant to the
foregoing clause,  the Investor delivers to the Company an opinion of counsel to
the Investor that the expiration of such rights will cause the Investor to cease
to qualify as a Venture Capital Operating Company (as such term is defined at 29
C.F.R.  Section  2510.3-101  or its  successor  regulation),  such  rights  will
continue  for as long as  necessary  to enable the  Investor to comply with such
regulation. The confidentiality provision hereof will survive the termination of
this Agreement.

         The Investor, Alta BioPharma Partners,  L.P., requires that the Company
be in  compliance  with  the  terms  of  the  Investments  Relating  To  Certain
Countries,  the  indemnification  of  Alta  BioPharma  Partners,  L.P.  and  the
Indemnified  Parties,  and the SuperFund  requirements of CERCLA  (Comprehensive
Environmental Response Compensation and Liability Act).

                              Page 46 of 48 Pages

<PAGE>

                INVESTMENTS RELATING TO CERTAIN FOREIGN COUNTRIES

         The  Company  has not  participated  and is not  participating  in,  an
anti-Israeli  boycott  within the scope of Chapter 7 of Part 2 of  division 4 of
Title 2 of the California Government Code as in effect from time to time.

                                 INDEMNIFICATION

         The Company will use its reasonable efforts to limit the liability,  to
the fullest extent  permissible  under the governing law of such company's state
of incorporation, of any director representing Alta BioPharma Partners, L.P. and
each of his or her affiliated parties.

                                     CERCLA
                             SUPERFUND REQUIREMENTS

1.       The Company,  to the best of its knowledge,  has not caused or allowed,
         nor has the Company contracted with any party for, the generation, use,
         transportation,   treatment,  storage  or  disposal  of  any  Hazardous
         Substances (as defined below) in connection  with the operations of its
         business or otherwise.

2.       The  Company,  to the  best of its  knowledge,  the  operations  of its
         business,  and any real  property  that the Company  owns,  leases,  or
         otherwise  occupies or uses (the "Premises") are in compliance with all
         applicable   Environmental  Laws  (as  defined  below)  and  orders  or
         directives of any governmental  authorities  having  jurisdiction under
         such   Environmental   Laws   including,    without   limitation,   any
         Environmental  Laws or orders or directives with respect to any cleanup
         or  remediation  of any  release  or threat  of  release  of  Hazardous
         Substances.

3.       The  Company,  to the  best  of its  knowledge,  has not  received  any
         citation, directive, letter or other communication, written or oral, or
         any notice of any  proceedings,  claims or  lawsuits,  from any person,
         entity  or  governmental  authority  arising  out of the  ownership  or
         occupation of the Premises, or the conduct of its operations, nor is it
         aware of any basis thereof.

4.       The  Company,  to  the  best  of its  knowledge,  has  obtained  and is
         maintaining  in full force and effect all necessary  permits,  licenses
         and  approvals  required by any  Environmental  Laws  applicable to the
         Premises  and the  business  operations  conducted  thereon  (including
         operations  conducted by tenants on the  Premises) and is in compliance
         with all such permits, licenses and approvals.

5.       The Company, to the best of its knowledge, has not caused, or allowed a
         release,  or a threat of release,  of any Hazardous Substance unto, nor
         to the best of the Company's knowledge has the Premises or any property
         at or near the Premises ever been subject to a release,  or a threat of
         a release, of any Hazardous Substance.

         The term,  "Environmental Laws" shall mean any federal,  state or local
law, ordinance or regulation pertaining to the protection of human health or the
environment  including,  without  limitation,  the  Comprehensive  Environmental
Response,  Compensation  and Liability  Act, 42 U.S.C.  Sections  9601, et seq.,
Emergency Planning and Community  Right-to-Know Act, 42 U.S.C Sections 11001, et
seq., and the Resource  Conservation and Recovery Act, 42 U.S.C.  Sections 6901,
et seq.

                               Page 47 of 48 Pages

<PAGE>

         The term,  "Hazardous  Substance"  includes oil and petroleum products,
asbestos,  polychlorinated  biphenyls  and  urea  formaldehyde,  and  any  other
materials classified as hazardous or toxic under any Environmental Laws.

         I ACKNOWLEDGE AND AGREE TO THE TERMS OF THIS DOCUMENT IN REGARDS TO THE
ALTA BIOPHARMA PARTNERS L.P. MANAGEMENT RIGHTS,  INVESTMENTS RELATING TO CERTAIN
FOREIGN COUNTRIES, INDEMNIFICATION AND THE CERCLA REQUIREMENTS.

                                                     CONNETICS, INC.


Date: April 10, 1998                                 By:  /s/ Thomas G. Wiggans
                                                        -----------------------

                                                     Title:
                                                           ---------------------


ACCEPTED AND AGREED:

ALTA BIOPHARMA PARTNERS, L.P.
BY: ALTA BIOPHARMA MANAGEMENT, LLC


BY:  /s/ Jean Deleage
    ----------------------
         MANAGING DIRECTOR


                              Page 48 of 48 Pages



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