SCICLONE PHARMACEUTICALS INC
8-K, 1998-01-26
PHARMACEUTICAL PREPARATIONS
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                       SECURITIES AND EXCHANGE COMMISSION

                              Washington, DC 20549


                                    FORM 8-K


                                 CURRENT REPORT


     Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934


       Date of Report (Date of Earliest Event Reported): December 17, 1997




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

                         SCICLONE PHARMACEUTICALS, INC.
             (Exact name of registrant as specified in its charter)

    California                     0-19825                      94-3116852
 -----------------           ---------------------          ------------------
  (State or other            (Commission File No.)            (IRS Employer
   jurisdiction                                             Identification No.)
 of incorporation)





901 Mariners Island Blvd.
Suite 315
San Mateo, California                                                   94404
- ----------------------------------------                              ----------
(Address of principal executive offices)                              (Zip Code)



Registrant's telephone number, including area code:  (650) 358-3456
                                                     --------------


<PAGE>

Item 5.  Other Events.

         SciClone Pharmaceuticals,  Inc. ("SciClone") and Alpha 1 Biomedicals, a
Delaware corporation ("Alpha 1"), have entered into the Alpha Rights Acquisition
Agreement  (the  "Acquisition  Agreement"),  dated  December 17,  1997,  whereby
SciClone   will  acquire  Alpha  1's  worldwide   marketing,   development   and
manufacturing  rights to  SciClone's  lead  drug,  thymosin  alpha 1.  Under the
Acquisition  Agreement,  which is subject to approval by Alpha 1's  stockholders
and certain other  conditions,  the aggregate  purchase price is $1.930 million,
consisting of $130,000 in cash and $1.8 million of SciClone  common stock priced
at $4.05 per share  (or  approximately  444,000  shares).  Previously,  Sciclone
licensed the product from Alpha 1.  SciClone  will no longer be obligated to pay
royalties to Alpha 1 on any of its own or its partners'  future  products sales.
The acquisition is expected to close in March 1998.

         A copy of the press release announcing the execution of the Acquisition
Agreement is attached as Exhibit 99.1 and is incorporated herein by reference.


Item 7.  Exhibits.

    Exhibit No.                           Description
    -----------                           -----------
        2.1          Alpha  Rights  Acquisition  Agreement  by and  between  the
                     registrant  and Alpha 1 Biomedicals,  Inc.,  dated December
                     17, 1997

       99.1          Press Release dated December 17, 1997


                                       2

<PAGE>


                                   Signatures

         Pursuant to the  requirements  of the Securities  Exchange Act of 1934,
the  registrant  has duly  caused  this report to be signed on its behalf by the
undersigned thereunto duly authorized.

Date:  January 26, 1998               SCICLONE PHARMACEUTICALS, INC.



                                      By: /s/ Donald R. Sellers
                                          -----------------------
                                          Donald R. Sellers
                                          President and Chief Executive Officer

                                       3

<PAGE>


                         SciClone Pharmaceuticals, Inc.
                                  Exhibit Index
                                   to Form 8-K



                                                                   
                                                                   
   Exhibit No.                        Description                  
   -----------                        -----------                  
       2.1         Alpha  Rights  Acquisition   Agreement  by  and  between  the
                   registrant and Alpha 1 Biomedicals,  Inc., dated December 17,
                   1997

      99.1         Press Release dated December 17, 1997

                                       4



                       ALPHA RIGHTS ACQUISITION AGREEMENT



                       Alpha 1 Biomedicals, Inc. as Seller
                                       and
                         SciClone Pharmaceuticals, Inc.

                                    as Buyer



                            Dated: December 17, 1997


<PAGE>


<TABLE>
                                                 TABLE OF CONTENTS
<CAPTION>
                                                                                                               Page
                                                                                                               ----
<S>       <C>                                                                                                  <C>
RECITALS .......................................................................................................1

1.       PURCHASE AND SALE......................................................................................3

2.       PURCHASE PRICE AND PAYMENT ............................................................................3

3.       LOAN ADVANCES..........................................................................................5

4.       REPRESENTATIONS AND WARRANTIES BY ALPHA  ..............................................................7

5.       REPRESENTATIONS AND WARRANTIES BY SCICLONE   ..........................................................7

6.       PRE-CLOSING MATTERS....................................................................................7

7.       CLOSING................................................................................................8

8.       COVENANTS.............................................................................................12
         8.1      Assumed and Retained Liabilities. ...........................................................12
         8.2      Confidentiality..............................................................................13
         8.3      Cooperation and Additional Documents; Omitted Items. ........................................15
         8.4      Access and Full Disclosure...................................................................15
         8.5      Normal Course of Business....................................................................16
         8.6      Covenant Not to Compete......................................................................16
         8.7      Bankruptcy.  ................................................................................17

9.       TERMINATION AND DEFAULT...............................................................................18
         9.1      Termination.  ...............................................................................18
         9.2      Default. ....................................................................................18
         9.3      Effect of Termination........................................................................18

10.      SURVIVAL OF REPRESENTATION AND WARRANTIES ............................................................19

11.      INDEMNIFICATION BY ALPHA..............................................................................19

12.      INDEMNIFICATION BY SCICLONE...........................................................................21

13.      TERMINATION OF 1994 AGREEMENT. .......................................................................22

14.      GENERAL PROVISIONS....................................................................................23
         14.1     Expenses.  ..................................................................................23
         14.2     Brokers. ....................................................................................24
         14.3     Entire Agreement.  ..........................................................................24
         14.4     Assignment. .................................................................................24
         14.5     Notices. ....................................................................................24
         14.6     Governing Law. ..............................................................................25



<PAGE>


                                                 TABLE OF CONTENTS

                                                                                                               Page
                                                                                                               ----

         14.7     Amendment....................................................................................26
         14.8     Counterparts. ...............................................................................26
         14.9     Public Disclosure. ..........................................................................26
         14.10    Further Assurances. .........................................................................26
         14.11    Headings.....................................................................................27
         14.12    Waiver. .....................................................................................27
         14.13    Parties in Interest. ........................................................................27
         14.14    Recovery of Litigation or Arbitration Costs..................................................27
         14.15    Severability.................................................................................28
         14.16    Time of Essence..............................................................................28
         14.17    Arbitration..................................................................................28
</TABLE>



<PAGE>


                       ALPHA RIGHTS ACQUISITION AGREEMENT

         This Agreement is entered into as of December 17, 1997 (the  "Effective
Date") by and among SciClone  Pharmaceuticals,  Inc., a California  corporation,
located in San Mateo, California ("SciClone"),  and Alpha 1 Biomedicals, Inc., a
Delaware corporation, located in Bethesda, Maryland ("Alpha").


                                    Recitals

     A.  Alpha  owns or holds a license  to  certain  technology  related to the
development, manufacture, use and sale of Thymosin Alpha 1 (or "TA-1").

     B. Alpha and SciClone  previously  have entered into that certain  Thymosin
Alpha 1 License  Agreement  dated as of August 19, 1994 (the "1994  Agreement"),
whereunder  Alpha has licensed to SciClone all of its rights with respect to the
development, manufacture, use, sale and distribution of TA-1. The 1994 Agreement
has been amended or  supplemented  by that certain  Amendment  No. 1 dated as of
June 7, 1995, and that certain  Amendment No. Two dated as of April 7, 1997, and
that certain  Prepaid  Royalty  Agreement  dated as of August 5, 1996 (the "1996
Prepaid Royalty Agreement"), and that certain Prepaid Royalty Agreement dated as
of September 3, 1997 (the "1997  Prepaid  Royalty  Agreement").  All  references
herein to the 1994 Agreement shall be deemed to include said Amendments and said
Prepaid Royalty Agreements.

     C.  Pursuant to the 1994  Agreement,  SciClone is  obligated to pay certain
royalties  to Alpha  based upon the Net Sales  Revenues  (as defined by the 1994
Agreement).

     D.  Pursuant to the 1994  Agreement,  rights  licensed by Alpha to SciClone
include  specified  patent rights owned by Alpha,  including  issued patents and
pending patent applications (collectively referred to as the "Alpha Owned Patent
Rights"),  as  described  on Exhibit A attached

                                       1

<PAGE>


hereto, together with certain patent rights which are owned by third parties and
licensed to Alpha, including both issued patents and pending patent applications
(collectively  referred to as the "Alpha Licensed Patent Rights"),  as described
on Exhibit B attached hereto.  The term "Alpha Patent Rights" shall include both
the Alpha Owned Patent Rights and the Alpha Licensed Patent Rights.

     E. The Alpha  Licensed  Patent  Rights  are  granted to Alpha  pursuant  to
certain  agreements  which are  described  on Exhibit C attached  hereto,  which
agreements  as  amended  are  hereinafter  referred  to as the  "Alpha IP Rights
Agreements".  As further  noted on Exhibit C, the Alpha  Licensed  Patent Rights
granted  pursuant  to the Alpha IP Rights  Agreements  are  granted  from (i) F.
Hoffmann-LaRoche Ltd., a Switzerland corporation,  located in Basle, Switzerland
("Roche-Basle"),  and (ii)  Hoffmann-LaRoche,  Inc.,  a New Jersey  corporation,
located in Nutley,  New Jersey  ("Roche-US").  Roche-Basle and Roche-US each are
referred to as a "Third Party Licensor."

     F.  Alpha is in need of  accelerating  the  timing  for  Alpha  to  realize
economic benefits from the future royalty income stream which Alpha contemplates
receiving from SciClone  pursuant to the 1994  Agreement,  as Net Sales Revenues
are earned by  SciClone  in the future  under the 1994  Agreement.  Accordingly,
Alpha  and  SciClone  have  negotiated  for Alpha to sell to  SciClone,  and for
SciClone to purchase from Alpha, all of the Alpha Patent Rights,  which sale and
purchase  shall be  affected  by  means  of a  modification  of the  rights  and
obligations of Alpha and SciClone under the 1994 Agreement as follows: (i) Alpha
will sell, assign and convey to SciClone all right, title and interest in and to
the Alpha Owned Patent  Rights,  (ii) the rights and  obligations  of Alpha with
respect to TA-1 under the Alpha  Licensed  Patent  Rights  will be  assigned  to
SciClone  (with the consent of the Third Party  Licensor,  as necessary ), (iii)
SciClone will be released from its royalty obligations under the 1994 Agreement,
all in consideration for which SciClone will make payments to Alpha provided for
in this  Agreement.  Said Alpha Patent Rights

                                       2

<PAGE>


and Alpha's  rights with  respect to TA-1 under Alpha IP Rights  Agreements  are
collectively called the "Alpha Rights."

     G.  SciClone  believes  there is value to SciClone to acquire fully paid up
rights to utilize the Alpha  Rights,  rather than to be  obligated to pay future
royalties on future Net Sales Revenues.

     H.  Pursuant to the terms of this  Agreement,  the 1994  Agreement is to be
terminated except as otherwise provided herein.


         WHEREFORE, the parties hereto mutually agree as follows:

     1. Purchase and Sale. For and in  consideration  of the cash to be paid and
loaned and the stock to be issued by  SciClone  to Alpha  pursuant  to Section 2
hereof,  and  the  other  provisions  of  this  Agreement,  and  subject  to the
conditions  and provisions of this  Agreement,  (i) Alpha hereby agrees to sell,
assign,  transfer,  convey,  quitclaim  and deliver to  SciClone  all of Alpha's
rights,  title and  interests in and to the Alpha Rights;  (ii) SciClone  hereby
agrees to purchase  and  acquire  said Alpha  Rights  from Alpha;  and (iii) the
parties agree to terminate the 1994 Agreement,  except as otherwise  provided in
Section 13 of this Agreement.

     2.  Purchase  Price and Payment The purchase  price  payable by SciClone to
Alpha for the Alpha Rights shall be as follows:

         (a) $130,000 in cash (the "Cash Consideration") payable as follows:

                  (1) $65,000 immediately on the Effective Date; and

                                       3

<PAGE>


                  (2)  $65,000  on the  business  day which is 30 days after the
         Effective Date.

         (b) A number of shares  of  SciClone  common  stock  ("SciClone  Common
Stock") equal to $1,800,000 divided by the "Initial Average Price." For purposes
of this Agreement, "Initial Average Price" shall mean the average of the closing
sales  price per share of  SciClone  Common  Stock,  as  reported  on the Nasdaq
National Market, for the 20 trading days immediately  preceding the date that is
three  trading  days prior to the  Effective  Date;  provided,  however,  if the
Initial  Average  Price is less than $3.00,  the Initial  Average Price shall be
deemed to be $3.00.  The shares of SciClone Common Stock issued pursuant to this
Section 2(b) shall be referred to as the "Initial Shares."

         (c) SciClone  shall issue  additional  shares of SciClone  Common Stock
(the "Additional  Shares") on each Lock-up Release Date (as defined in Section 5
of the form of Stock Rights Agreement  attached hereto as Exhibit D), the number
of such Additional Shares, if any, issued on such date being equal to:


        [($150,000 x A) - (A x (the Initial Shares divided by 12) x B)] - C
        --------------------------------------------------------------
                                       B


Where:   A =  the  number  of  Lock-up  Release  Dates  that  have   transpired,
              including the then-current Lock-up Release Date.

         B =  the  sum of the  "Average  Prices"  for the  then-current  Lock-up
              Release  Date and each prior  Lock-up  Release Date divided by the
              number of such Lock-up Release Dates.

         C =  the aggregate number of Additional Shares previously issued.

                                       4

<PAGE>


     However, in no event shall the sum of the Initial Shares and the Additional
Shares exceed 600,000 shares.


     The Initial Shares and the Additional  Shares are referred to  collectively
as the  "Shares."  "Average  Price" shall mean the average of the closing  sales
price per share of SciClone  Common  Stock,  as reported by the Nasdaq  National
Market,  for the 20 trading days  preceding  the date that is three trading days
prior to the applicable Lock-up Release Date.

         (d) In the event that SciClone effects any consolidation,  combination,
stock   distribution,   stock  dividend,   stock  split,   reverse  stock  split
recapitalization  or similar  transaction,  the provisions of paragraphs (b) and
(c) shall be correspondingly adjusted.

         (e) The  Shares  shall  have  such  registration  rights,  and shall be
subject to such resale limitations, as are set forth in a Stock Rights Agreement
to be entered into between Alpha and SciClone at the Closing,  the form of which
is attached hereto as Exhibit D.

         (f) In the event that the Closing  does not occur for any reason,  then
the 1994  Agreement  shall remain in full force and effect,  and all of the Cash
Consideration  (up to  $130,000,  less any  deduction  pursuant  to Section  6.3
hereof),  paid to  Alpha  under  Section  2(a)  hereof  shall  be  treated  as a
prepayment  of  royalties  to Alpha  under  the same  terms as the 1997  Prepaid
Royalty  Agreement,  with the result that the amount of such Cash  Consideration
shall be credited at the rate of ten dollars  ($10.00) of royalties for each one
dollar  ($1.00) of the Cash  Consideration  paid.  These credits  against future
royalties  will take effect after  SciClone or its  affiliate  have made royalty
payments to Alpha totaling $1,750,000.

     3. Loan Advances

                                       5

<PAGE>


         3.1 SciClone agrees that, on the sixty-first calendar day following the
Effective  Date,  SciClone shall make a $70,000 loan advance to Alpha.  Upon the
Closing,  said loan advance shall be treated as a loan advance made pursuant to,
evidenced by, and repayable in accordance with, the Promissory Note and Security
Agreement,  in the form attached  hereto as Exhibit E, which Alpha shall execute
and deliver to SciClone at the  Closing.  If for any reason the Closing does not
occur,  then said loan advance  shall be treated as a prepayment of royalties to
Alpha  under the same  terms as the 1997  Prepaid  Royalty  Agreement,  with the
result that the amount of such loan advance shall be credited at the rate of ten
dollars  ($10.00) of royalties for each one dollar  ($1.00) of the loan advance.
This credit  shall be taken only after the credits  referenced  in Section  2(f)
hereof are first utilized and exhausted.

         3.2 SciClone  agrees,  that on the latter to occur of (i) 30 days after
the $70,000 loan advance made pursuant to Section 3.1 hereof,  or (ii) the first
business day following the Closing,  and on the same business day of each of the
next  two (2)  months  thereafter  that is prior  to the  effective  date of the
registration  statement  contemplated  by the Stock Rights  Agreement  (the "S-3
Effective Date"),  SciClone shall make a loan advance of $70,000 per month (each
an  "Advance")  to Alpha  (provided  Alpha  is not in  material  breach  of this
Agreement)  for up to an  aggregate  of $210,000  of  Advances  pursuant to this
Section 3.2,  which when combined with the $70,000 loan advance made pursuant to
Section 3.1 aggregates to $280,000 of Advances.

         3.3 The Advances  shall be repaid in  accordance  with the terms of the
Promissory Note and Security  Agreement,  in the form attached hereto as Exhibit
E, which Alpha shall execute and deliver to SciClone at the Closing.

                                       6

<PAGE>


     4.  Representations and Warranties by Alpha. In order to induce SciClone to
enter into and perform this  Agreement,  Alpha hereby makes the  representations
and warranties set forth in Exhibit F attached hereto, subject to the exceptions
set forth on the Schedule of Exceptions attached hereto as Exhibit G.

     5. Representations and Warranties by SciClone.  In order to induce Alpha to
enter into and perform this Agreement,  SciClone hereby make the representations
and warranties set forth in Exhibit H attached hereto, subject to the exceptions
set forth on the Schedule of Exceptions attached hereto as Exhibit I.

     6. Pre-Closing Matters

         6.1 Alpha  shall  use its Best  Efforts  to file,  within  twenty  (20)
business days after the Effective  Date,  with the United States  Securities and
Exchange Commission ("SEC"), Alpha's proxy statement for a stockholders meeting,
at which meeting Alpha's  stockholders will be asked to approve the transactions
contemplated by this Agreement (the "Stockholders Meeting"). Alpha shall use its
Best  Efforts  to  obtain  SEC  clearance  for said  proxy  statement,  and upon
obtaining such clearance,  Alpha shall promptly mail said proxy statement to its
stockholders and schedule and hold a stockholders meeting.

         6.2 In the proxy  statement and at the  Stockholders  Meeting,  Alpha's
Board of Directors shall recommend,  to the extent consistent with its fiduciary
duty, that the Alpha stockholders approve the transactions  contemplated by this
Agreement,  and Alpha shall use its

                                       7

<PAGE>


Best Efforts to obtain such  approval.  Alpha shall  notify  SciClone in writing
upon obtaining said stockholders approval.

         6.3 For the Net Sales (as defined in the 1994 Agreement) under the 1994
Agreement made from and after the Effective  Date, no royalties  shall be earned
or payable to Alpha (other than those payable to Third Party Licensors), so long
as the Closing  ultimately occurs. If for any reason the Closing does not occur,
then any and all  royalties  as  specified  in the 1994  Agreement  shall become
earned and payable on the Net Sales which  occurred from and after the Effective
Date, and said earned  royalties  shall be deducted from the Cash  Consideration
paid by SciClone to Alpha pursuant to Section 2(a) hereof.

         6.4 Alpha and SciClone  have  mutually  approved a press release in the
form attached  hereto as Exhibit K, which press release shall be issued promptly
after the Effective Date.

     7. Closing

         7.1 A closing (the  "Closing") at which the  transactions  specified in
this Agreement as occurring at the Closing shall be held at the offices of Gray,
Cary,  Ware &  Freidenrich,  Palo Alto,  California,  on a date that is mutually
agreed to by Alpha and SciClone  that is within five (5) business days after all
of the  conditions  to the Closing have been  satisfied or waived (the  "Closing
Date"),  or on such  other  date or at such other  location  as may be  mutually
agreed to by the parties.  The Closing  conditions and procedure shall be as set
forth in Section 7.2 hereof.

         7.2 Closing  Conditions  and  Procedures.  Each of the following  items
shall be a precondition  to the Closing,  unless waived by both parties  (except
for the  conditions of

                                       8

<PAGE>


Sections  7.2(d) and 7.2(e) which shall be a condition to the obligation of only
the party that is the beneficiary  thereof),  and the following procedures shall
be followed to accomplish the Closing:

         (a) Consent from Third Party  Licensors.  Prior to the  Closing,  Alpha
shall obtain and furnish to SciClone (i) all  agreements  and consents from each
Third Party Licensor, in form and substance reasonably satisfactory to SciClone,
necessary  to effect  the  assignment  of the Alpha  Licensed  Patent  Rights to
SciClone, and (ii) an acknowledgment from each Third Party Licensor, in form and
substance  reasonably  satisfactory  to SciClone,  that upon such assignment the
Alpha Licensed Patent Rights will remain in full force and effect, and there are
no  outstanding  defaults  by Alpha with  respect to the Alpha  Licensed  Patent
Rights.

         (b)  Assignments.  At the  Closing,  Alpha  shall  deliver to  SciClone
assignments of the Alpha Rights, in form and substance  reasonably  satisfactory
to SciClone.

         (c) Government Filings. At the Closing, Alpha shall deliver to SciClone
short form assignments of the Alpha Owned Patent Rights appropriate for SciClone
to file with the United States Patent and Trademark Office,  and for SciClone to
file with foreign  governmental  offices that are  identified by SciClone,  in a
form and substance reasonably satisfactory to SciClone. Alpha shall also deliver
to SciClone any other  appropriate  assignments  and  documents  for filing with
governmental  regulatory bodies as SciClone reasonably may request to effect the
assignment  of Alpha Rights  contemplated  by this  Agreement.  All expenses for
filing  fees and legal  fees to effect  the  conveyance  of the Alpha  Rights to
SciClone  shall be borne by SciClone,  excluding  any fees of Alpha's  attorneys
(other than if SciClone specially engages Alpha's attorney for certain specified
services).

                                       9

<PAGE>


         (d)  Representations  and Warranties Remain True and Correct. As of the
Closing Date,  all of the  representations  and warranties by Alpha and SciClone
contained  in this  Agreement  shall be deemed to be restated as of the Closing,
and all of said  representations and warranties shall be true and correct in all
material  respects as of the Closing Date,  and SciClone shall deliver to Alpha,
and Alpha shall deliver to SciClone, a closing certificate confirming the same.

         (e) Compliance with Covenants. As of the Closing Date, each party shall
in all material respects have performed and complied with the covenants that are
to be performed  and complied with as of the Closing  Date,  and SciClone  shall
deliver to Alpha,  and Alpha shall  deliver to SciClone,  a closing  certificate
confirming the same.

         (f) Absence of Adverse Events.  Prior to the Closing Date,  there shall
not have occurred any material adverse event applicable to the Alpha Rights that
is outside of the control of SciClone.  Without  limiting the  generality of the
foregoing,  there  shall  not  be  any  material  claim  of  any  invalidity  or
infringement with respect to the Alpha Rights,  and there shall not be any claim
of any material default  relating to TA-1 under the Alpha IP Rights  Agreements,
and no creditors of Alpha shall have  commenced  or  threatened  to commence any
bankruptcy  proceedings  or creditor  collection  proceeding  against Alpha that
could have a material adverse effect on the Alpha Rights or on SciClone's rights
under this  Agreement.  Alpha shall  deliver to  SciClone a closing  certificate
confirming the same.

         (g) No  Action  Commitment  from  Creditors.  Alpha  shall  cause to be
delivered  to  SciClone  from  Alpha's  creditors  who hold at least  90% of the
aggregate  dollar  value

                                       10

<PAGE>


of  Alpha's  outstanding  financial  obligations,   a  "No  Action  Commitment,"
substantially  in the form  attached  hereto as Exhibit J, or such other form as
may be mutually approved by Alpha and SciClone.

         (h) Stock Issuance. At the Closing, SciClone shall issue to Alpha stock
certificates  evidencing  the Shares  specified  in  Section  2(b)  hereof;  and
SciClone shall retain custody of said stock  certificates to the extent provided
in the Promissory Note and Security  Agreement,  in order to perfect  SciClone's
security interest therein.

         (i) Stock Rights  Agreement.  At the Closing,  SciClone and Alpha shall
execute and deliver the Stock Rights  Agreement,  in the form attached hereto as
Exhibit D.

         (j)  Stockholder  Approval.  At the  Closing,  Alpha  shall  furnish to
SciClone a  certificate  of its  corporate  secretary  certifying  that  Alpha's
stockholders have duly approved the transactions contemplated by this Agreement.

         (k) Promissory Note and Security Agreement. At the Closing, Alpha shall
execute and deliver to SciClone the Promissory Note and Security  Agreement,  in
the form attached hereto as Exhibit E.

         (l) License From Alpha.  Prior to the Closing,  Alpha shall execute and
deliver to  SciClone  an  assignment  of all  license  agreements,  if any,  not
previously  assigned to SciClone  pursuant to which Alpha has granted any rights
to a third party with respect to the Alpha Rights,  and Alpha shall provide such
notice of  assignment  to, or obtain  such  consent  of,  any such  third  party
licensee  as is  necessary  to effect  such  assignment.  Without  limiting  the
generality  of the  foregoing,  and for avoidance of doubt,  the parties  hereby
acknowledge and agree

                                       11

<PAGE>


that upon the  Closing,  Alpha shall not be  entitled  to any  further  payments
applicable to any agreements with respect to Sclavo, including the April 7, 1997
Amendment No. Two to the 1994 Agreement, except as otherwise provided in Section
13 hereof.

     8. Covenants

         8.1  Assumed  and  Retained  Liabilities.  From and after the  Closing,
SciClone hereby assumes all of the  liabilities of Alpha,  and agrees to perform
all of the  covenants and  agreements  of Alpha,  in respect of the Alpha Rights
that accrue as of and after the Closing (the  "Assumed  Liabilities").  From and
after  the  Closing,  Alpha  shall  continue  to be  responsible  for all of the
liabilities  of Alpha,  and shall perform all of the covenants and agreements of
Alpha in respect of, the Alpha Rights  accrued as of the Closing,  but excluding
all of the  liabilities,  covenants and agreements of Alpha that SciClone agreed
to assume or perform  under the 1994  Agreement  (the  "Retained  Liabilities").
Notwithstanding  the foregoing,  and in addition to the foregoing,  SciClone and
Alpha shall each  continue to have and  perform the  obligations  under the 1994
Agreement  that are to survive as  specified  in Section 13 hereof.  Alpha shall
indemnify,  defend and hold  harmless  SciClone from and against (i) any and all
liabilities,  obligations,  and claims  arising  prior to the Closing  Date with
respect to the Retained  Liabilities,  and (ii) any claims made against SciClone
by  creditors  of Alpha  by  reason  of the  transactions  contemplated  by this
Agreement  (excluding  the  Assumed  Liabilities  and  excluding  any  surviving
obligations of SciClone  under the 1994  Agreement).  SciClone shall  indemnify,
defend  and hold  harmless  Alpha

                                       12

<PAGE>


from and against any and all  liabilities,  obligations  and claims arising from
and after the Closing Date with respect to the Assumed Liabilities.

         8.2 Confidentiality.

         (a) Each party  agrees  that for a period of ten (10)  years  after the
date of  expiration  of the last patent  included in the Alpha  Rights,  it will
maintain  in  confidence,  and  will  not  use  or  disclose,  any  Confidential
Information disclosed to it by the other party, except that either party may use
and  disclose  Confidential   Information  to  the  extent  such  disclosure  is
reasonably necessary to comply with applicable governmental laws and regulations
(including without limitation the federal securities laws), and SciClone may use
all Confidential Information of Alpha with respect to the Alpha Rights.

         (b)  "Confidential  Information"  shall  mean,  with  respect to either
party, any confidential  information or data, and any other information relating
to any  research  project,  work in  process,  future  development,  scientific,
engineering,  manufacturing,  marketing,  business plan,  financial or personnel
matter  of such  party,  its  present  or  future  products,  sales,  suppliers,
customers,  employees, investors or businesses whether in oral, written, graphic
or electronic  form, that is identified as Confidential  Information  under this
Agreement in a writing  delivered by the disclosing party to the receiving party
contemporaneously  with the transfer of the information or, if disclosed orally,
is  identified  a  Confidential  Information  in  a  writing  delivered  by  the
disclosing  party to the  receiving  party  within  twenty  (20)  business  days
following such oral  disclosure;  provided,  however,  Confidential  Information
shall not include any information that:

                                       13

<PAGE>


                  (i) was already known to the receiving party, other than under
an  obligation  of  confidentiality  to the  disclosing  party,  at the  time of
disclosure to the receiving party;

                  (ii) was generally  available to the public or otherwise  part
of the public domain at the time of its disclosure to the receiving party;

                  (iii) becomes  generally  available to the public or otherwise
becomes part of the public domain after its  disclosure to the receiving  party,
other than through any act or omission of the receiving  party in breach of this
Agreement;

                  (iv) was disclosed to the receiving party, other than under an
obligation  of  confidentiality,  by a third party who had no  obligation to the
disclosing party not to disclose such information to others; or

                  (v)  was  independently  developed  by  the  receiving  party,
without use of Confidential Information of the disclosing party.

         (c) Alpha  agrees that for a period of ten (10) years after the date of
expiration of the last patent included in the Alpha Rights,  it will maintain in
confidence and not use or disclose the Alpha  Technical  Information (as defined
by  the  1994  Agreement)   except  that  Alpha  may  disclose  Alpha  Technical
Information  (i) to the  extent  that the  disclosure  of such  Alpha  Technical
Information does not relate to the Alpha Rights, (ii) the disclosure of which is
required by governmental laws or regulations  (including  without limitation the
federal  securities  laws),  or (iii) the  disclosure  of which is  required  to
prosecute or defend any litigation.  In the case

                                       14

<PAGE>


of any disclosure  permitted by  subparagraphs  (ii) or (iii) above,  before any
such  disclosure  is made,  Alpha  shall use its best  efforts to give  SciClone
written  notice at least ten (10)  business  days in advance of the  disclosure,
together with a legal opinion that the exception in  subparagraph  (ii) or (iii)
is  satisfied.  In any event,  any such  disclosure  shall be only that  limited
information which is required to be disclosed, and no more.

         8.3 Cooperation  and Additional  Documents;  Omitted Items.  Each party
hereby  agrees to cooperate  with the other party and to execute and deliver any
and all  documents  and to take  any and all  actions  as  might  be  reasonably
required to carry out the purposes and  intentions  of this  Agreement.  Without
limiting the generality of the foregoing, in the event there is any subsequently
discovered or identified  TA-1 patent right or agreement owned by or licensed by
or to Alpha which is within the intended scope of the Alpha Rights as identified
on  Exhibits  A, B, and C  attached  hereto,  but which has  inadvertently  been
omitted  from said  exhibits,  then said  omitted  rights  or  agreements  shall
automatically  be deemed to be added to said  exhibits,  and the  parties  shall
execute and deliver appropriate documentation to so identify said omitted rights
or agreements.

         8.4 Access and Full Disclosure.

         (a) From and after the date of this  Agreement,  and  continuing  for a
period of three (3) years after the  Closing,  (i) Alpha shall  cooperate  fully
with  SciClone to provide to SciClone  copies of and/or  access to all  relevant
information,  files,  documents,  reports and materials  applicable to the Alpha
Patent  Rights and the Alpha IP Rights  Agreements,  and

                                       15

<PAGE>


(ii) Alpha  shall  fully  disclose  to  SciClone  any new  information  or newly
identified  information  which comes to the  attention of Alpha  concerning  the
Alpha Rights.

         (b) From and after the date of this  Agreement and prior to the Closing
(i)  Alpha  shall  fully  disclose  to  SciClone  any new  information  or newly
identified  information  concerning  any material  adverse change in the factual
representations  made by Alpha  pursuant to this  Agreement,  and (ii)  SciClone
shall  fully  disclose  to  Alpha  any  new  information  or  newly   identified
information  which comes to the  attention of SciClone  concerning  any material
adverse change in the factual  representations made by SciClone pursuant to this
Agreement.

         8.5 Normal Course of Business.  From the date of this  Agreement  until
the Closing  Date,  Alpha shall  continue  to conduct its  business  and affairs
related  to the Alpha  Rights in the  normal and  ordinary  course of  business.
Without the prior written consent of SciClone,  Alpha shall not take any action,
omit to take any  required  action,  or execute or deliver  any  agreement  with
respect to the Alpha Rights  which is not in the ordinary  course of business of
Alpha.

         8.6 Covenant Not to Compete.

         (a) For so long as any patent  included in the Alpha Rights  remains in
effect in some country,  Alpha agrees that it will not,  directly or indirectly,
make, have made, use, or sell TA-1 anywhere in the world.

         (b) Alpha acknowledges that a remedy at law for any breach or attempted
breach of this Section 8.6 will be inadequate and further agrees that any breach
of this

                                       16

<PAGE>


Section 8.6 will result in irreparable harm to SciClone; and Alpha covenants and
agrees not to oppose any demand for  specific  performance  and  injunctive  and
other  equitable  relief in case of any such breach or attempted  breach.  Alpha
acknowledges that this Section 8.6 contains  reasonable  limitations as to time,
geographical  area and scope of activity to be  restrained  that do not impose a
greater restraint than is necessary to protect the rights of SciClone  purchased
from Alpha pursuant to this Agreement. Whenever possible, each provision of this
Section 8.6 shall be  interpreted  in such manner as to be  effective  and valid
under  applicable  law,  but if any  provision  of this  Section  8.6  shall  be
prohibited  by  or  invalid  under  applicable  law,  such  provision  shall  be
ineffective  to  the  extent  of  such   prohibition   or  invalidity,   without
invalidating  the remainder of such provision  whether  remaining  provisions of
this Section 8.6. If any provision of this Section 8.6 shall, for any reason, be
judged by any court of competent  jurisdiction  to be invalid or  unenforceable,
such  judgment  shall not affect,  impair or  invalidate  the  remainder of this
Section, but shall be confined in its operation to the provision of this Section
8.6 directly  involved in the controversy in which such judgment shall have been
rendered.  In the event that the  provisions  of this Section 8.6 should ever be
deemed to exceed the time or  geographic  limitations  permitted  by  applicable
laws,  then such  provision  shall be reformed to a maximum  time or  geographic
limitations permitted by applicable law.

         8.7  Bankruptcy.  Alpha agrees that it will not,  within 180 days after
the Closing  Date,  file for any federal  bankruptcy  proceeding  or any similar
state law proceeding  without first giving to SciClone at least thirty (30) days
prior written notice. In the event any federal or state bankruptcy proceeding is
filed  against  Alpha  within  such  period,  Alpha  hereby

                                        17

<PAGE>


agrees to so notify  SciClone in writing  within three (3)  business  days after
Alpha receives notice thereof.

     9. Termination and Default

         9.1 Termination. If (i) the Closing has not occurred by April 30, 1998,
or (ii) the stockholders of Alpha fail to approve the transactions  contemplated
by this Agreement at the Stockholders Meeting, then either Alpha or SciClone, if
it is not then in default of its obligations under this Agreement, may terminate
this Agreement any time  thereafter upon delivering to the other party a written
notice of  termination.  Until  any such  notice of  termination  is given,  the
parties shall continue to use their reasonable,  diligent and good faith efforts
to cause the closing conditions to be satisfied and the Closing to occur as soon
as practical.

         9.2  Default.  If prior to the  Closing  any party is in default of its
obligations  under this  Agreement,  and such default is not cured within thirty
(30) days after written  notice of default is given to the  defaulting  party by
the  other  party to this  Agreement,  then the  non-defaulting  party  shall be
entitled to terminate  this  Agreement by delivering to the  defaulting  party a
written notice of termination.

         9.3  Effect of  Termination.  In the event of any  termination  of this
Agreement pursuant to Section 9.2, the non-defaulting party shall be entitled to
pursue any and all remedies at law or equity  available  against the  defaulting
party.  If this  Agreement is  terminated  pursuant to Section 9.1, then neither
party shall have any further rights or obligations under this Agreement,  except
that the provisions in Sections 2(f),  6.3, 8.2, 9.3 and 14 hereof shall survive
such

                                       18

<PAGE>


termination of this Agreement and remain in effect as applicable. The provisions
in Section 2(f) shall survive and remain in effect after any termination of this
Agreement for any reason.

     10.  Survival of  Representation  and  Warranties The  representations  and
warranties  made by the parties in this Agreement  shall survive the Closing and
shall in no manner be limited by any investigation of the subject matter thereof
made by or on behalf of either party or by the  satisfaction of any condition to
the Closing.

     11. Indemnification by Alpha

         11.1  Provided  the  Closing  occurs,  Alpha shall  indemnify  and save
harmless  SciClone,  its stockholders,  directors,  officers and agents from and
against  any  and  all  losses,   liabilities,   expenses  (including,   without
limitation,  fees and  disbursements of counsel and expenses of  investigation),
claims,  liens or  other  obligations  whatsoever  (hereinafter  individually  a
"Claim" or collectively  "Claims")  incurred by any such indemnified  party as a
result of (i) the breach of any representation or warranty made by Alpha in this
Agreement  or  otherwise  made in writing and  delivered by Alpha to SciClone in
connection with the transactions contemplated hereby; and/or (ii) any failure of
Alpha to perform or comply with any of its  covenants and  agreements  set forth
herein or in any other  document  executed in connection  with the  transactions
contemplated hereby. No indemnification  obligation shall arise hereunder unless
and  until  the  aggregate  amount  of Claims  hereunder  exceeds  $50,000  (the
"Basket").  In the event  that the  amount of all  Claims  exceeds  the  Basket,
SciClone  shall be entitled to collect the full amount of all Claims  (including
the Basket Claims).

                                       19

<PAGE>


         11.2 The following are  conditions  precedent to any liability of Alpha
under Section 11.1:

         (a)  SciClone  shall give Alpha prompt  written  notice of any event or
assertion of which it has knowledge concerning any Claims and as to which it may
request indemnification.

         (b)  SciClone  shall  cooperate  with and assist  Alpha in defending or
settling the Claims.

         (c) SciClone shall permit Alpha to control the defense or settlement of
the Claims,  including  selection of counsel to  represent  SciClone (so long as
such counsel shall be reasonably  satisfactory to SciClone and that such counsel
shall  diligently  and  effectively  defend the Claim).  SciClone  may  maintain
separate counsel at its own cost and expense in connection with any Claim.

         (d) In no event shall SciClone settle a Claim without the prior written
approval of Alpha, which approval shall not be unreasonably withheld.

         11.3 The indemnification  obligations of Alpha under Section 11.1 shall
apply to any Claim as to which notice has been given pursuant to Section 11.2(a)
prior to the third  anniversary  of the Closing Date, and shall continue in full
force and  effect as to any such  Claim  until  such  Claim has been  settled by
mutual agreement of the parties concerned, by arbitration in accordance with the
provisions of this  Agreement or, in the event of a Claim  resulting  from legal
action by a third party,  by the final  order,  decree or judgment of a court of
competent  jurisdiction

                                       20

<PAGE>


in the United  States of America  (the time for appeal  having  expired  with no
appeal having been taken).

     12. Indemnification by SciClone

         12.1 Provided the Closing  occurs,  SciClone  shall  indemnify and save
harmless Alpha, it stockholders,  directors, officers and agent from and against
any and all losses, liabilities,  expenses (including,  without limitation, fees
and disbursements of counsel and expenses of  investigation),  claims,  liens or
other obligations whatsoever (hereinafter individually a "Claim" or collectively
"Claims") incurred by any such indemnified party as the result of (i) the breach
of any  representation  or  warranty  made  by  SciClone  in this  Agreement  or
otherwise made in writing and delivered by SciClone to Alpha in connection  with
the  transactions  contemplated  hereby;  and/or (ii) any failure of SciClone to
perform or comply with any of its covenants and  agreements  set forth herein or
in any other document executed in connection with the transactions  contemplated
hereby. No indemnification obligation shall arise hereunder unless and until the
aggregate  amount of Claims  hereunder  exceeds $50,000 (the  "Basket").  In the
event that the amount of all Claims exceeds the Basket,  Alpha shall be entitled
to collect the full amount of all Claims (including the Basket Claims).

         12.2  The  following  are  conditions  precedent  to any  liability  of
SciClone under Section 12.1:

                                       21

<PAGE>


         (a) Alpha shall give  SciClone  prompt  written  notice of any event or
assertion of which it has knowledge concerning any Claims and as to which it may
request indemnification.

         (b) Alpha shall  cooperate  with and assist  SciClone in  defending  or
settling the Claims.

         (c) Alpha shall permit SciClone to control the defense or settlement of
the Claims,  including  selection of counsel to represent Alpha (so long as such
counsel  shall be  reasonably  satisfactory  to Alpha  and  that  counsel  shall
diligently  and  effectively  defend the  Claim).  Alpha may  maintain  separate
counsel at its own cost and expense in connection with any Claim.

         (d) In no event shall Alpha  settle a Claim  without the prior  written
approval of SciClone, which approval shall not be unreasonably withheld.

         12.3 The  indemnification  obligations  of SciClone  under Section 12.1
shall apply to any Claim as to which  notice has been given  pursuant to Section
12.2(a) prior to the third  anniversary  of the Closing Date, and shall continue
in full force and effect as to any such Claim until such Claim has been  settled
by mutual agreement of the parties concerned,  by arbitration in accordance with
the  provisions  of this  Agreement or, in the event of a Claim  resulting  from
legal action by a third party, by the final order, decree or judgment of a court
of competent  jurisdiction  in the United States of America (the time for appeal
having expired with no appeal having been taken).

     13. Termination of 1994 Agreement.  Effective as of the time of the Closing
of this Agreement, the 1994 Agreement shall terminate, except that the following
provisions of, or

                                       22

<PAGE>


obligations  under,  the 1994 Agreement shall remain in full force and effect in
accordance  with their  terms  under the 1994  Agreement  (except  as  otherwise
provided  in this  Article  13)  notwithstanding  the  execution,  delivery  and
performance of this Agreement.

         13.1 Article 1 (Definitions)  insofar as such definitions relate to any
of the other surviving provisions of the 1994 Agreement.

         13.2 All obligations of SciClone to the extent still applicable,  under
Sections 2.5.3, 4.1, 4.2, 4.3, 4.4, 5.3 and 5.4.

         13.3 Article 6 (Standstill Agreements),  except that Alpha Owned Shares
(as  defined by  Section  6.3.1 of the 1994  Agreement)  shall not  include  the
Initial Shares or any Additional Shares.

         13.4 Article 7 (Mutual Release).

         13.5 Article 8 (Confidentiality).

         13.6 Section 11.1.1 (Termination).

         13.7 Sections 13.3, 13.4, and 13.6 (Indemnification).

         13.8 Article 14 (Audit).

         13.9 Article 16 (Miscellaneous).

     14. General Provisions.

                                       23

<PAGE>


         14.1 Expenses.  Except as otherwise  provided in this Agreement and the
Ancillary Documents,  the parties will each pay their own legal,  accounting and
other  professional  expenses  incurred  in  connection  with  the  transactions
contemplated hereby.

         14.2 Brokers.  Each party  represents and warrants to the other that no
person has acted as a broker,  a finder or in any similar capacity in connection
with  the  transactions   contemplated  by  this  Agreement  and  the  Ancillary
Documents.  Each party shall indemnify the other against, and agrees to hold the
other  harmless  from,  all  liabilities  and  expenses  (including   reasonable
attorneys' fees and expenses) in connection with any claim by anyone against the
other for  compensation  as a broker,  a finder or in any similar  capacity,  by
reason of services  allegedly  rendered to the indemnifying  party in connection
with the transactions contemplated hereby.

         14.3 Entire Agreement.  This Agreement  (including the Exhibits hereto)
and the Ancillary  Documents  contain the entire  agreement  between the parties
with respect to the matters  contemplated  hereby,  and all prior  negotiations,
understandings  and  agreements  between them are  superseded by this  Agreement
(except to the extent otherwise provided herein) and the Ancillary Documents.

         14.4 Assignment.  Neither this Agreement nor the Ancillary Documents or
any right of any party hereunder or thereunder may be assigned without the prior
written  consent of the other party,  which  consent  shall not be  unreasonably
withheld;  provided, however, that either party may assign its rights under this
Agreement or the Ancillary Documents, without the consent of the other party, to
any entity that acquires such party through a merger, consolidation, or

                                       24

<PAGE>


purchase of all or substantially all of its stock or assets.  This Agreement and
the Ancillary Documents bind and inure to the benefit of each party's successors
and permitted assigns.

         14.5 Notices.  Any notice or other communication  required or permitted
to be given under this Agreement or the Ancillary  Documents shall be in writing
and will be deemed effective (i) when delivered in person,  or (ii) when sent by
confirmed facsimile,  or (iii) on the fifth day after the day on which mailed by
first class mail from  within the United  States of America,  and  addressed  as
provided  herein,  or (iv) on the first  business  day  following  delivery to a
national  overnight  courier service and addressed as provided herein.  Any such
notice  or other  communication  sent by mail,  courier  or  facsimile  shall be
addressed as follows,  unless and until a different address is designated by the
party by notice as provided herein:


         If to SciClone      SciClone Pharmaceuticals, Inc.
                             901 Mariners Island Blvd. #315
                             San Mateo, CA 94404
                             Attn:  Shawn Singh
                             Facsimile No.: (650) 358-3469


         With a copy to:     Gray Cary Ware & Freidenrich
                             4365 Executive Dr., Suite 1600
                             San Diego, CA 92121
                             Attn:  Knox Bell, Esq.
                             Facsimile No.: (619) 677-1477


         If to Alpha:        Alpha 1 Biomedicals, Inc.
                             6707 Democracy Boulevard
                             Suite 111
                             Bethesda, MD  20817-1129
                             Attn:  Michael Berman, Ph.D.
                             Facsimile No.:  (301) 564-4424

                                       25

<PAGE>


         With a copy to:     Covington & Burling
                             1201 Pennsylvania Avenue, N.W.
                             Washington, D.C.  20044
                             Attn:  D. Michael Lefever
                             Facsimile No.: (202) 662-6291

         14.6 Governing Law. This Agreement and the Ancillary  Documents will be
governed by, and construed under, the laws of the State of California.

         14.7  Amendment.  This  Agreement  and the  Ancillary  Documents may be
amended only by a document in writing signed by the parties hereto or thereto.

         14.8  Counterparts.  This  Agreement or any Ancillary  Documents may be
executed in two counterparts,  each of which will be deemed an original, but all
of which together will constitute one and the same agreement.  Signatures may be
transmitted by facsimile,  and this Agreement or any Ancillary Documents will be
fully binding once the signatures of both parties have been so transmitted.

         14.9  Public  Disclosure.  No party  shall  disclose  the terms of this
Agreement or any Ancillary  Documents  without the written  consent of the other
party, except as required by law or pursuant to the disclosure obligations under
the rules and regulations of the SEC. SciClone shall file with the SEC a request
for  confidential  treatment  as to  various  confidential  provisions  in  this
Agreement, and Alpha shall file with the SEC a request for the same confidential
treatment,  except to the extent that Alpha's  legal  counsel  opines in writing
that  it is  legally  improper  for  Alpha  to make  such a  request  that  such
provisions be given  confidential  treatment,  but subject to any ultimate final
decision  made by the SEC as to  confidentiality  and  disclosure.  The  parties
hereby  consent to the  disclosure  as set forth in the press  release  attached
hereto as Exhibit L.

                                       26

<PAGE>


         14.10  Further  Assurances.  Each party  agrees to execute such further
instruments  and  documents  and to do such  further  acts as may be  reasonably
requested by any other party to carry out the transactions  contemplated by this
Agreement and such Ancillary Document.

         14.11  Headings.  Captions and headings used herein are for convenience
of  reference  only  and  are  not a part of  this  Agreement  or any  Ancillary
Documents and shall not be used in constructing  this Agreement or any Ancillary
Documents.

         14.12  Waiver.  No waiver of any  provision  of this  Agreement  or any
Ancillary  Documents  shall be binding  unless  executed in writing by the party
making the waiver,  and no such waiver  shall  constitute  a waiver of any other
provision of this Agreement or any Ancillary Documents,  whether or not similar,
nor shall any waiver constitute a continuing waiver unless so stated in any such
writing.

         14.13 Parties in Interest.  Nothing in this  Agreement or any Ancillary
Document,  whether  express  or  implied,  is  intended  to confer any rights or
remedies under or by reason of this Agreement or such Ancillary Documents on any
persons  other  than  the  parties  hereto  and  thereto  and  their  respective
successors and permitted  assigns (and their  affiliates and other persons as to
the  indemnification  specified  in  Sections 11 and 12) of this  Agreement  and
Article  2 of the Stock  Rights  Agreement.  Nothing  in this  Agreement  or any
Ancillary  Document  is  intended  to relieve or  discharge  the  obligation  or
liability of any third person to either party to this Agreement or any Ancillary
Documents,  nor  shall  any  provision  give  any  third  person  any  right  of
subrogation  or  action  over  against  either  party to this  Agreement  or any
Ancillary Documents.

                                       27

<PAGE>


         14.14 Recovery of Litigation or Arbitration Costs. If any legal action,
arbitration or other proceeding is brought for the enforcement of this Agreement
or any Ancillary Documents,  or because of an alleged dispute,  breach, default,
or misrepresentation in connection with any of the provisions of this Agreement,
the  successful or prevailing  party shall be entitled to recover from the other
party  reasonable  attorneys'  fees and other  costs  incurred in that action or
proceeding, in addition to any other relief to which it or they may be entitled,
as may be decided by the arbitrators pursuant to Section 14.17 hereof.

         14.15 Severability. Each term, covenant, condition or provision of this
Agreement and each Ancillary Documents shall be viewed as separate and distinct,
and in the event that any such term,  covenant,  condition or provision shall be
held to be invalid by a proper court or in an arbitration  proceeding,  then the
remaining  provisions  shall  continue in full force and effect,  so long as the
essential benefits of this Agreement and each Ancillary  Documents will still be
realized by the parties.

         14.16 Time of Essence. Time is of the essence in the performance of all
obligations under this Agreement and each Ancillary Documents.

         14.17 Arbitration.  Any controversy or claim arising out of or relating
to this Agreement or any Ancillary  Documents,  including without limitation any
breach thereof,  and the indemnification  provisions hereof, shall be settled by
binding  arbitration in accordance with the Commercial  Arbitration Rules of the
American Arbitration Association ("AAA"), and the procedures set forth below. In
the event of any  inconsistency  between the Rules of AAA and the

                                       28

<PAGE>


procedures  set forth  below,  the  procedures  set forth below  shall  control.
Judgment upon the award rendered by the arbitrators may be enforced in any court
having jurisdiction thereof.

         (a)  Location.  The  location  of the  arbitration  (i) shall be in the
County of Santa Clara, California,  if the proceeding is initiated by Alpha, and
(ii)  shall be in the  County of  Montgomery,  Maryland,  if the  proceeding  is
initiated by SciClone.

         (b) Selection of Arbitrators.  The arbitration  shall be conducted by a
panel of three neutral  arbitrators who are independent and  disinterested  with
respect to the parties, this Agreement, and the outcome of the arbitration. Each
party shall appoint one neutral arbitrator,  and the two arbitrators so selected
shall then select the third arbitrator. If one party has given written notice to
the other party as to the identity of the arbitrator appointed by the party, and
the party  thereafter  makes a written  demand on the other party to appoint its
designated  arbitrator  within the next ten days,  and the other  party fails to
appoint its designated  arbitrator  within ten days after receiving said written
demand,  then the arbitrator who has already been  designated  shall appoint the
other two arbitrators.

         (c)  Discovery.  Unless  the  parties  mutually  agree  in  writing  to
additional  pre-hearing  discovery,  the only pre-hearing discovery shall be (a)
reasonably limited production of relevant and non-privileged  documents, and (b)
the   identification   of  witnesses   to  be  called  at  the  hearing,   which
identification  shall  give  the  witness'  name,  general   qualifications  and
position,  and a brief  statement as to the general scope of the testimony to be
given by the  witness.  The  arbitrators  shall  decide any  disputes  and shall
control the process concerning these

                                       29

<PAGE>


pre-hearing  discovery  matters.  Pursuant to the Rules of AAA,  the parties may
subpoena witnesses and documents for presentation at the hearing.

         (d) Case Management.  Prompt  resolution of any dispute is important to
both parties; and the parties agree that the arbitration of any dispute shall be
conducted  expeditiously.  The arbitrators are instructed and directed to assume
case management  initiative and control over the arbitration  process (including
scheduling of events,  pre-hearing discovery and activities,  and the conduct of
the  hearing),  in order to complete  the  arbitration  as  expeditiously  as is
reasonably practical for obtaining a just resolution of the dispute.

         (e) Remedies.  The arbitrators  shall follow and apply  applicable law.
The  arbitrators  shall  grant such legal or  equitable  remedies  and relief in
compliance with applicable law that the arbitrators deem just and equitable,  to
the same extent that  remedies or relief  could be granted by a state or federal
court,  provided  however,  that no punitive  damages  may be awarded.  No court
action may be maintained  seeking punitive  damages.  The decision of any two of
the three  arbitrators  appointed shall be binding upon the parties and shall be
enforceable in any court of competent jurisdiction.

         (f)  Expenses.   The  expenses  of  the   arbitration,   including  the
arbitrators'  fees,  expert witness fees, and attorney's fees, may be awarded to
the  prevailing  party,  in  the  discretion  of  the  arbitrators,  or  may  be
apportioned  between  the  parties  in  any  manner  deemed  appropriate  by the
arbitrators.  Unless and until the  arbitrators  decide that one party is to pay
for all (or a share) of such  expenses,  both parties shall share equally in the
payment of the arbitrators' fees as and when billed by the arbitrators.

                                       30

<PAGE>


         (g) Construction.  This Agreement and the Ancillary  Documents shall be
construed and  interpreted in accordance  with the plain meaning of the entirety
of the provisions of this Agreement and the Ancillary Documents, consistent with
the overall  intent and spirit of the parties and the entire  Agreement  and the
Ancillary  Documents.  As both parties and their legal counsel have participated
in the  negotiations  and the  drafting  for this  Agreement  and the  Ancillary
Documents,  any  ambiguity or  inconsistency  in any of the  provisions  of this
Agreement  and the Ancillary  Documents  shall not be construed  against  either
party as the draftsman of this Agreement and the Ancillary Documents.

     IN WITNESS WHEREOF,  the parties have executed and delivered this Agreement
as of the date set forth above.

                         SCICLONE:
                              SciClone Pharmaceuticals, Inc.,
                              a California corporation

                              By: /s/ Donald R. Sellers
                                 ----------------------------------------------

                         ALPHA:
                              Alpha 1 Biomedicals, Inc.,
                              a Delaware corporation

                              By: /s/ Michael L. Berman
                                 ----------------------------------------------

                                       31

<PAGE>


                                INDEX TO EXHIBITS


Exhibit                    Description
- -------                    -----------

  A            Alpha Owned Patent Rights

  A-1          Owned 100% by Alpha

  A-2          Owned Jointly with Others

  B            Alpha Licensed Patent Rights

  C            Alpha IP Rights Agreements

  D            Form of Stock Rights Agreement

  E            Form of Promissory Note and Security Agreement

  F            Alpha Representations and Warranties

  G            Schedule of Exceptions to Alpha Representations and Warranties

  H            SciClone Representations and Warranties

  I            Schedule of Exceptions to SciClone Representations and Warranties

  J            No Action Commitments from Alpha's Creditors

  K            Press Release

                                       32

<PAGE>


                                    EXHIBIT A

                            Alpha Owned Patent Rights



                 1.       Patent Rights Owned 100% by Alpha:

                          See Exhibit A-1



                 2.       Patent Rights Owned by Alpha Jointly with Others:

                          See Exhibit A-2


<PAGE>
<TABLE>
                                                             ExhibitA-1

                                                 ALPHA RIGHTS ACQUISITION AGREEMENT

                                                      ALPHA OWNED PATENT RIGHTS
                                                        (Owned 100% by Alpha)

<CAPTION>

                                                              APPLICATION       PATENT
SUBJECT                              COUNTRY                  NUMBER            NUMBER                  APPLICANT(S)
<S>                                 <C>                       <C>               <C>                       <C>
Solid Phase                         Austria                   86302731          E 91 130 B                Alpha
Process for                         Belgium                   86302731          0 200 404                 Alpha
Synthesizing                        Canada                    506,495           1,271,300                 Alpha
Peptides                            EPO                       86302731.4        0200404                   Alpha
                                    Germany                   86302731          36 88 632 T2              Alpha
                                    Israel                    78479             78479                     Alpha
                                    Israel                    97297             97297                     Alpha
                                    Italy                     86302731          0 200 404                 Alpha
                                    Luxembourg                86302731          0 200 404                 Alpha
                                    Sweden                    86302731          0 200 404                 Alpha
                                    United States             06/849,835        4,855,407                 Wang
                                    Switzerland               82302731          0 200 404
                                    Germany                   86302731          0 200 404
                                    France                    86302731          0 200 404
                                    Great Britain             86302731          0 200 404
                                    Hong Kong                 0 200 404         10/1977
                                    Japan                     82423/86
                                    Netherlands               86302731          0 200 404
                                    United States             849,835           4,855,407

Solid Phase Process                 Taiwan                    78103481          44023                     Alpha
for Synthesizing
Thymosin Alpha 1                    Belgium                   89304584.9        0 341 935
                                    Switzerland               89304584.9        0 341 935
                                    Germany                   89304584.9        P68926178

                                                          1

<PAGE>

                                                              APPLICATION       PATENT
SUBJECT                              COUNTRY                  NUMBER            NUMBER                  APPLICANT(S)

                                    European                  89304584.9        0 341 935
                                    Great Britain             89304584.9        0 341 935
                                    Japan                     115944/89
                                    South Korea               89-6267
                                    U.S.                      07/192,349        Abandoned
                                    United States             07/684,520        5,610,272
                                    United States             08/695,772

Analogs of Thymosin                 Taiwan                    83100771                                    Alpha
Alpha 1                             United States             08/188,232                                  Wang
                                    Argentina                 330,747
                                    Canada                    2,181,477
                                    Chile                     134-95
                                    Colombia                  95.002.305
                                    European                  95907463.4
                                    Indonesia                 P-950140
                                    Japan                     520088/1995
                                    Malaysia                  PI 9500180
                                    Peru                      259687
                                    Philippines               49849
                                    Thailand                  025289
                                    Taiwan                    83100771
                                    Venezuela                 115-95
                                    PCT                       US95/00617
                                    South Africa              95/0669                   95/0669

Thymosin Alpha 1 derivatives        China                     93119346                                    Alpha
                                    Columbia                  94003132                                    Alpha
                                    Ecuador                   94-1031                   PI96-918          Alpha
                                    Indonesia                 P0940180                                    Alpha
                                    Malaysia                  PI9400180                                   Alpha
                                    Mexico                    940861                                      Alpha
                                    PCT                       94/01249 (Abandoned)                        Alpha
                                    Peru                      236106                                      Alpha
                                    Philippines               47697                                       Alpha
                                    South Africa              94/0745                   94/0745           Alpha

                                                          2

<PAGE>

                                                              APPLICATION       PATENT
SUBJECT                              COUNTRY                  NUMBER            NUMBER                  APPLICANT(S)

                                    Taiwan                    82104001                                    Alpha
                                    Thailand                  021377                                      Alpha
                                    United States (FWC)       08/246572                 5,512,656         Wang
                                    United States             08/013,087                                  ABANDONED
                                    Venezuela                 177/94                                      Alpha

Synthesis of                        United States             917,059                   4,148,788         Wang
Thymosin Alpha 1

[Asn2] Thymosin Alpha 1             United States             871,563                   4,116,951         Wang
and Analogs thereof
</TABLE>

                                                          3

<PAGE>

<TABLE>

                                                             ExhibitA-2
                                                 ALPHA RIGHTS ACQUISITION AGREEMENT

                                                      ALPHA OWNED PATENT RIGHTS
                                                 (Owned Jointly by Alpha and Others)
<CAPTION>

                                                              APPLICATION               PATENT
SUBJECT                             COUNTRY                   NUMBER                    NUMBER            APPLICANT(S)
<S>                                 <C>                       <C>                       <C>               <C>
Composition and                     South Africa              92/6964                   92/6964           Chretien
Method of Treating                                                                                        Mutchnick
Hepatitis C                                                                                               Sherman
                                    Argentina                 330,747
                                    Indonesia                 P-004712                                    Chretien
                                                                                                          Mutchnick
                                                                                                          Sherman
                                    Malaysia                  PI 9201633                                  Chretien
                                                                                                          Mutchnick
                                                                                                          Sherman
                                    Mexico                    925240                                      Chretien
                                                                                                          Mutchnick
                                    PCT                       PCT/US92/07556                              Alpha
                                                                                                          Mutchnick
                                                                                                          Sherman
                                    PCT-Australia             26447/92                  667327            Alpha
                                                                                                          Mutchnick
                                                                                                          Sherman
                                    PCT-Canada                2119006                                     Alpha
                                                                                                          Mutchnick
                                                                                                          Sherman
                                    PCT-Czechoslovakia        PV551-94                                    Alpha
                                                                                                          Mutchnick
                                                                                                          Sherman
                                    PCT-EPO*                  929119977.6                0603305          Alpha
         *(Austria, Belgium, Switzerland, Denmark, Germany, Spain, France, United Kingdom,                Mutchnick
            Greece, Ireland, Italy, Luxemberg, Netherlands and Lichenstein)                               Sherman

                                                          4

<PAGE>

                                                              APPLICATION               PATENT
SUBJECT                             COUNTRY                   NUMBER                    NUMBER            APPLICANT(S)

                                    PCT-Finland               941133                                      Alpha
                                                                                                          Mutchnick
                                                                                                          Sherman
                                    PCT-Hungary               P9400758                                    Alpha
                                                                                                          Mutchnick
                                                                                                          Sherman
                                    PCT-Japan                 506083/1993                                 Alpha
                                                                                                          Mutchnick
                                    PCT-Norway                P941310                                     Alpha
                                    (Abandoned)                                                           Mutchnick
                                                                                                          Sherman
                                    PCT-Romania               94-00409                                    Alpha
                                                                                                          Mutchnick
                                                                                                          Sherman
                                    PCT-Russia Fed.           94022480.14                                 Alpha
                                                                                                          Mutchnick
                                                                                                          Sherman
                                    PCT-South Korea           94/0700603                                  Alpha
                                                                                                          Mutchnick
                                                                                                          Sherman
                                    Philippines               44927                                       Chretien
                                    Singapore                 9606295-5                                   Mutchnick
                                                                                                          Sherman
                                    Taiwan                    81101971                  NI66154           Chretien
                                                                                                          Mutchnick
                                    United States             07/759,544                                  Chretien
                                                              ABANDONED                                   Mutchnick

Composition and Method              United States             08/145,660                                  Chretien
of treating Hepatitis C.                                                                                  Mutchnick
(Refiling  on 11/4/93 of 07/759,544
filed on 9/13/91)

Method and Composition              Indonesia                 P940716                                     Alpha
for Treatment of Patients                                                                                 Wayne State
Having Decompensated Liver Japan                              279386/1993                                 Chretien
Disease                                                                                                   Mutchnick
                                    Malaysia                  PI9401152                                   Alpha
                                                                                                          Wayne State

                                                          5

<PAGE>

                                                              APPLICATION               PATENT
SUBJECT                             COUNTRY                   NUMBER                    NUMBER            APPLICANT(S)

                                    Mexico                    943453                                      Alpha
                                                                                                          Wayne State
                                    PCT                       US93/10619                                  Alpha
                                                                                                          Wayne State
                                    Philippines               48239                                       Alpha
                                                                                                          Wayne State
                                    Singapore                 9606415-9
                                    South Africa              94/3226 (Abandoned)                         Chretien
                                                                                                          Mutchnick
                                    Taiwan                    82109337                                    Chretien
                                                                                                          Mutchnick
                                    U.S.                      08/313,160
                                    Australia                 55920/94
                                    Canada                    2,175,337
                                    Europe                    94901265.2 (BE, DE, DK, ES, Fr, GB, Gr, It, PT, SE)
                                    Korea                     96-702942
                                    Netherlands               94901265.2
                                    Norway                    P961775
                                    New Zealand               258326

Method of Treating                  China                     931139345.1                                 Chretien
Hepatitis C in Non-                                                                                       Mutchnick
Responders, to Interferon           Japan                     331601/1993                                 Alpha
Treatment (CIP of                                                                                         Wayne State
07/759,544)                         Malaysia                  PI9400381                                   Alpha
                                                                                                          Wayne State
                                    Mexico                    941675                                      Alpha
                                                                                                          Wayne State
                                    PCT                       US94/02320                                  Alpha
                                                                                                          Wayne State
                                    Philippines               47868                                       Alpha
                                                                                                          Wayne State
                                    South Africa              94/1499                   94/1499           Alpha
                                                                                                          Wayne State
                                    United States             08/027,500                                  Chretien
                                                                                                          Mutchnick
                                    Australia                 62759/94
                                    Canada                    2,157,479
                                    European                  94910226.3

                                                          6

<PAGE>

                                                              APPLICATION               PATENT
SUBJECT                             COUNTRY                   NUMBER                    NUMBER            APPLICANT(S)

                                    Finland                   954127
                                    Korea                     95-703297
                                    Norway                    P953473
                                    Singapore                 9605604-9

Thymosin alpha 1 for the            PCT                       US94/12106
treatment of autoimmune
hepatitis                           Taiwan                    82108901                  NI071799          Chretien
                                                                                                          Mutchnick
                                    United States             08/141,013                5,468,729         Chretien
                                                                                                          Mutchnick
                                    Indonesia                 P-941820
                                    Japan
                                    Mexico                    9408106
                                    Malaysia                  PI 9402830
                                    Philippines               49229
                                    Singapore                 9606784-8
                                    Thailand                  024237
                                    South Africa              94/8252                   94/8252

Thymosin Alpha 1                    New Zealand               185,519                   185,519           Alpha
                                                                                                          Texas
                                    South Africa              77/5976                   77/5976           Alpha
                                                                                                          Texas
</TABLE>

                                                          7

<PAGE>

<TABLE>
                                                              Exhibit B

                                                 ALPHA RIGHTS ACQUISITION AGREEMENT

                                                    ALPHA LICENSED PATENT RIGHTS
                                                  (Patent Rights Licensed to Alpha)

<CAPTION>
                                                              APPLICATION               PATENT
SUBJECT                             COUNTRY                   NUMBER                    NUMBER            APPLICANT(S)
<S>                                 <C>                       <C>                       <C>               <C>
Immunoassay of                      United States             Not Known                 4,427,783         Newman
Thymosin Alpha 1                                                                                          Nishikawa
ABANDONED                                                                                                 Spiegel
                                                                                                          Symington
Process for                         United States             300,324                   4,374,197         Horecker
Thymosin Alpha 1
ABANDONED

Radioimmunoassay                    United States             Not Known                 4,264,571         Goldstein
of Thymosin Alpha 1                                                                                       McClure

[Improved] Radio-                   United States             139,944                   4,339,427         Goldstein
immunoassay of                                                                                            McClure
Thymosin Alpha 1                                                                                          Wang

Thymosin Alpha 1                    Argentina                 269752                    214903            Not Known
 
                                    Australia                 296699/77                 514,996           Not Known
 
                                    Austria                   A 7658/77                 362,493           Not Known
 
                                    Belgium                   182108                    860169            Not Known

                                                           8


<PAGE>

                                                              APPLICATION               PATENT
SUBJECT                             COUNTRY                   NUMBER                    NUMBER            APPLICANT(S)

                                    Canada                    289510                    1,101,842         Not Known
 
                                    Chile                     738/77                    30,986            Not Known
 
                                    Denmark                   4782/77                   149,094           Not Known
 
                                    EPO                       84103670.0                Not Known         Not Known
 
                                    EPO                       84103671.0                Not Known         Not Known
 
                                    Finland                   773221                    56317             Not Known
 
                                    France                    7732259                   7732259           Not Known
 
                                    Germany                   P2748213.9                2748213           Not Known
                                    Federal
                                    Republic

                                    Great Britain             45001/77                  1,590,457         Not Known
 
                                    Hungary                   HO 2021                   172,798           Not Known
 
                                    Iran                      23092                     21330             Not Known
                                    Ireland                   2191/77                   45819             Not Known
                                    Israel                    53218/77                  53218             Not Known
 
                                    Italy                     29020/77                  1,195,254         Not Known
 
                                    Italy                     Not Known                 1113134           Not Known
 
                                    Japan                     127666/77                 1,345,074         Not Known
                                    Luxembourg                78395                     78395             Not Known
                                    Monaco                    1268/77                   126878-1167       Not Known
                                    Netherlands               7711814                   188,699
                                    New Zealand               185,519                   185,519           Not Known
 
                                    Norway                    3681/77                   143,346           Not Known
                                    Peru                      14963/78                  2,001             Not Known

                                                           9


<PAGE>

                                                              APPLICATION               PATENT
SUBJECT                             COUNTRY                   NUMBER                    NUMBER            APPLICANT(S)

                                    Philippines               20361/77                  13,961            Not Known
                                    Portugal                  67204                     67204             Not Known
                                    Singapore                 Not Known                 1220/93           Not Known
                                    South Africa              5976/77                   77/5976           Not Known
                                    South Korea               2475/77                   12019             Not Known
                                    Spain                     463588                    463,588           Not Known
                                    Sweden                    7712071-5                 7712071           Not Known
                                    Switzerland               12161/77                  633,258           Not Known
                                    United States             766,638                   4,079,127         Goldstein
                                                                                                          Low
                                                                                                          Lai
                                                                                                          Wang
                                    Uruguay                   20517                     11,714            Not Known
                                    Venezuela                 2060/77                   Not Known         Not Known
                                    Yugoslavia                P 2573/77                 Not Known         Not Known

                                                          10

</TABLE>

<PAGE>


                                    EXHIBIT C

                           Alpha IP Rights Agreements



     1. Commercial Text Agreement,  dated September 15, 1982,  between  Roche-US
and Alpha, as amended by an Amendment to Commercial  Text  Agreement,  effective
August 7, 1984, a letter  agreement dated September 18, 1986, a letter agreement
dated  September  22, 1986,  an Agreement  effective  December 21, 1989,  and an
Agreement  effective  August  6,  1991,  as  related  to all  Thymosin  Alpha  I
technology  and rights;  but  excluding  from the  assignment  to  SciClone  all
technology  and rights related to Thymosin Beta 3, Thymosin Beta 4 and any other
non-Thymosin Alpha I technology.

     2. License Agreement,  effective as of August 5, 1986, between  Roche-Basle
and Alpha, as amended by a letter agreement date March 4, 1991.

     3. License  Agreement  (Japan),  effective as of October 21, 1988,  between
Roche-Basle and Alpha, as amended by a letter agreement dated March 4, 1991, and
a letter agreement dated March 5, 1982.

     4. License Agreement (Other  Countries),  effective as of October 28, 1988,
between  Roche-Basle and Alpha, as amended by a letter  agreement dated March 4,
1991, and a letter agreement dated March 5, 1992.




<PAGE>



                                    EXHIBIT D

                             Stock Rights Agreement

         This  Agreement,  dated as of , 1998,  is entered into between  Alpha 1
Biomedicals,  Inc. ("Alpha") and SciClone  Pharmaceuticals,  Inc.  ("SciClone").
Certain terms used in this Agreement are defined in Section 9 hereof. Terms used
in this  Agreement  that are not defined herein have the same meaning as defined
in an Acquisition  Agreement,  dated as of December ___, 1997, between Alpha and
SciClone.

     1. Registration Rights.

         1.1 Within 30 days  following  after the Closing Date,  SciClone  shall
file with the SEC a  registration  statement (the  "Registration  Statement") on
Form S-3 (or any  successor  form to Form S-3)  under the  Securities  Act for a
public resale by Alpha of the SciClone  Common Stock  acquired by Alpha pursuant
to Section 2 of the Acquisition Agreement (the "Covered Shares"). SciClone shall
use its  Best  Efforts  to  cause  the  Registration  Statement  to be  declared
effective (the "S-3 Effective  Date") within 120 days after the Closing Date and
to remain effective for the period (the "Effective  Period") ending on the first
to occur of (i) the date the Covered Shares may be sold by Alpha pursuant to the
provisions  of paragraph (k) of Rule 144 under the  Securities  Act, or (ii) the
date Alpha has resold all of the Covered Shares.

         1.2 In connection  with the  registration  provided for in Section 1.1,
SciClone shall at its expense:

                                       1

<PAGE>


               (a)  Furnish to Alpha at least three (3)  business  days prior to
the  filing  thereof,  a  copy  of  the  Registration  Statement,   any  related
prospectus, and any amendments or supplements thereto, that SciClone proposes to
file with the SEC  (including  copies of all exhibits  thereto).  If Alpha shall
reasonably object to the form or substance of any such documents, SciClone shall
not file such document until Alpha's objections have been resolved.

               (b) Prepare and file with the SEC such amendments and supplements
to the  Registration  Statement and each  prospectus used in connection with the
Registration  Statement,  including the filing of all required reports under the
Securities  Exchange Act of 1934,  as amended (the  "Exchange  Act"),  as may be
necessary to comply with the  provisions of the  Securities  Act with respect to
the   disposition  all  of  the  Covered  Shares  and  to  keep  the  prospectus
continuously current for the entire Effective Period;

               (c) Furnish Alpha with a copy of the Registration Statement,  and
all amendments thereto, as and when filed by SciClone with the SEC.

               (d)  Furnish  to Alpha  such  number of  copies of a  prospectus,
including a preliminary prospectus, and any necessary amendments and supplements
thereto,  each prepared in conformity  with the  requirements  of the Securities
Act,  and such  other  documents  as Alpha may  reasonably  request  in order to
facilitate the disposition of the Covered Shares;

               (e) Use Best Efforts to register or otherwise qualify the Covered
Shares for sale under such securities or Blue Sky laws of such  jurisdictions as
shall be reasonably requested by Alpha;  provided,  however, that SciClone shall
not be required in connection

                                       2

<PAGE>


therewith  or as a  condition  thereto to qualify  to do  business  or to file a
general consent to service of process in any such jurisdictions;

               (f) Notify Alpha  promptly  (but in any event within two business
days)  (i) when the  Registration  Statement,  or any  post-effective  amendment
thereto, has been declared effective by the SEC, (ii) of the issuance by the SEC
of any stop order suspending the effectiveness of the Registration  Statement or
the  initiation  of any  proceeding  for such  purpose,  (iii) of the receipt by
SciClone  of  any   notification   with  respect  to  the   suspension   of  the
qualification,  or exemption from qualification,  of the Covered Shares for sale
in any jurisdiction, and (iv) of the happening of any event, of the existence of
any condition,  or of any information  becoming known to SciClone that (A) makes
any  statement  made  in  the  Registration  Statement,  in  any  prospectus  or
prospectus  supplement,  or  in  any  document  incorporated  or  deemed  to  be
incorporated  therein  by  reference,  untrue  in any  material  respect  or (B)
requires  the making of any  change in, or  amendments  or  supplements  to, the
Registration Statement, any prospectus or prospectus supplement, or any document
incorporated or deemed  incorporated  therein by reference,  so that it will not
contain any untrue  statement  of a material  fact or omit to state any material
fact required to be stated therein or necessary to make the  statements  therein
not misleading;

               (g)  Cause  all  of the  Covered  Shares  to be  listed  on  each
securities  exchange and each quotation  system on which  securities of the same
class issued by SciClone are then listed;

                                       3

<PAGE>


               (h) Use its Best Efforts to prevent the issuance of any order (i)
suspending the effectiveness of the Registration  Statement,  (ii) preventing or
suspending the use of any related prospectus or prospectus supplement,  or (iii)
suspending the  qualification  (or exemption from  qualification)  of any of the
Covered Shares for sale in any  jurisdiction,  and, if any such order is issued,
use its Best  Efforts  to obtain  the  withdrawal  of any such  order as soon as
practicable; and

               (i) Upon the  occurrence  of any  event  referred  to in  Section
1.2(f)(iv),  as promptly as practicable  (but in no event later than 10 calendar
days)  prepare  and file with the SEC,  (A) a  post-effective  amendment  to the
Registration Statement,  (B) a supplement or amendment to any related prospectus
or  prospectus   supplement  or  any  document  incorporated  or  deemed  to  be
incorporated therein by reference,  or (C) any other required document,  so that
the  prospectus  with  respect to the Covered  Shares will not contain an untrue
statement of a material  fact or omit to state any material  fact required to be
stated  therein or necessary  to make the  statements  therein,  in light of the
circumstances under which they were made, not misleading.

         1.3 SciClone shall pay all costs, fees and expenses associated with the
SciClone's  performance of or compliance with this Agreement,  including without
limitation,  all  registration  fees,  the  costs of  compliance  with the state
securities or Blue Sky laws,  the fees and  disbursements  of  SciClone's  legal
counsel and accountants,  and all printing  expenses;  provided,  however,  that
SciClone  shall not be required to pay any  underwriting  commissions or similar
charges or the legal fees and disbursements of counsel for Alpha.

                                       4

<PAGE>


     2. Indemnification.

         2.1 SciClone agrees to indemnify and hold harmless Alpha, its officers,
directors,  agents and employees  and each Person,  if any, who control any such
Person within the meaning of either  Section 15 of the Securities Act or Section
20 of the  Exchange  Act (a "Control  Person"),  against all Damages  caused by,
arising out of, or based upon (i) any failure of SciClone to comply with any and
all securities  laws,  rules or regulations,  (ii) any breach by SciClone of its
obligations  under  this  Agreement,  or (iii)  any  untrue  or  alleged  untrue
statement of material fact contained in the Registration Statement,  any related
prospectus or  preliminary  prospectus  or any  amendment  thereof or supplement
thereto,  or any omission or alleged  omission of a material fact required to be
stated  therein or  necessary  to make the  statements  therein not  misleading,
except  insofar  as any such  untrue  statement  or  omission  was  caused by or
contained in any information furnished in writing to SciClone by Alpha expressly
for use therein or by Alpha's failure to deliver a copy of a current  prospectus
(as  amended  or  supplemented)  after  SciClone  has  furnished  Alpha  with  a
sufficient number of copies for such purpose.

         2.2 Alpha shall  furnish to SciClone in writing  such  information  and
affidavits  as  SciClone  reasonably  requests  for use in  connection  with the
preparation  of  the  Registration  Statement  and  any  related  prospectus  or
preliminary  prospectus,  or any amendment  thereof or supplement  thereto,  and
agrees to indemnify SciClone, its directors and officers and each Control Person
of  SciClone  against all Damages  resulting  from any untrue or alleged  untrue
statement of material fact contained in the  Registration  Statement any related
prospectus or  preliminary  prospectus,  or any amendment  thereof or supplement
thereto,  or any omission or alleged  omission

                                       5

<PAGE>


of a  material  fact  required  to be stated  therein or  necessary  to make the
statements  therein  not  misleading,  but only to the extent  that such  untrue
statement or omission is contained in any  information or affidavit so furnished
in writing by Alpha expressly for use therein.

         2.3 Any Person  entitled to  indemnification  hereunder  shall (i) give
prompt  written  notice to the  indemnifying  party of any claim with respect to
which it seeks  indemnification  and (ii)  unless in such  indemnified  Person's
reasonable  judgment a conflict of interest between such indemnified  Person and
indemnifying  party exists with respect to such claim,  permit such indemnifying
party to assume the defense of such claim with counsel  reasonably  satisfactory
to the indemnified  Person. If such defense is assumed,  the indemnifying  party
will  not be  subject  to any  liability  for any  consent  to the  entry of any
judgment or any settlement  made by the  indemnified  Person without its consent
(but such consent will not be unreasonably  withheld). An indemnifying party who
is not entitled to, or elects not to,  assume the defense of a claim will not be
obligated  to pay the fees and  expenses  of more than one  counsel  (other than
local  counsel,  as  necessary)  with respect to such claim for all  indemnified
Persons,  unless in the reasonable judgment of any indemnified Person a conflict
of interest  exists between such  indemnified  Person and any other  indemnified
Person with respect to such claim. The indemnifying party shall not, without the
prior  written  consent of the  indemnified  Person,  effect any  settlement  or
compromise  of any  pending or  threatened  proceeding  in respect of which such
indemnified  Person is or could have been a party, and indemnity could have been
sought hereunder by such indemnified Person, unless such settlement (i) includes
an  unconditional  written  release  of such  indemnified  Person,  in form  and
substance reasonably satisfactory to such indemnified Person, from all liability
on the claims  that are the  subject  matter of such  settlement,

                                       6

<PAGE>


(ii) does not include any statement as to an admission of fault,  culpability or
failure  to act by or on behalf of any  indemnified  Person,  and (iii) the sole
relief  provided  consists  of  monetary  damages  that  are paid in full by the
indemnifying party.

         2.4 Contribution.

               (a) To the extent that the  indemnification  provided for in this
Section 2 is for any reason unavailable to, or insufficient to hold harmless, an
indemnified  Person in respect of any losses,  claims,  damages or  liabilities,
then the indemnifying  party, in lieu of indemnifying  such  indemnified  person
hereunder  and in order to provide for just and  equitable  contribution,  shall
contribute to the amount paid or payable by such indemnified  Person as a result
of  such  losses,  claims,  damages  or  liabilities  in such  proportion  as is
appropriate to reflect the relative fault of indemnifying  party on the one hand
and the  indemnified  Person on the other hand in connection with the statements
or omissions or alleged  statements  or omissions  that resulted in such losses,
claims,  damages or liabilities  (or actions in respect  thereof).  The relative
fault of the indemnifying  party and the indemnified  Person shall be determined
by reference to, among other things,  whether the untrue statement or a material
fact or the  omission or alleged  omission to state a material  fact  relates to
information  supplied by  SciClone on the one hand or Alpha on the other,  their
relative intent, knowledge, access to information, and opportunity to correct or
prevent  such  statement  or omission,  and any other  equitable  considerations
appropriate in the circumstances.

               (b) The parties  agree that it would not be just and equitable if
contribution  pursuant  to this  Section  2 were  determined  by any  method  of
allocation that does not take account of the equitable  considerations  referred
to in paragraph  (a). The amount paid or

                                       7

<PAGE>


payable by an indemnified Person as a result of the losses,  claims, damages and
liabilities  referred to in paragraph (a) shall include all reasonable  legal or
other expenses actually  incurred by such indemnified  Person in connection with
investigating  and  defending  any such  action  or claim.  No Person  guilty of
fraudulent  misrepresentation  (within  the  meaning  of  Section  11(f)  of the
Securities  Act) shall be entitled to  contribution  from any Person who was not
guilty of such fraudulent misrepresentation.

               (c) The indemnity and contribution  agreements  contained in this
Section 2 are in addition to any liability that an indemnifying  party otherwise
may have to the indemnified Person.

         2.5 The  indemnification  provided for under this Section 2 will remain
in full force and effect regardless of any investigation made by or on behalf of
the indemnified  Person or any officer,  director or controlling  person of such
indemnified Person and will survive the sale or transfer of the Covered Shares.

     3. Current Public Information.  During the Effectiveness  Period,  SciClone
shall  timely file all reports  required to be filed by it under the  Securities
Exchange Act of 1934, as amended,  and the rules and regulations  adopted by the
SEC thereunder (the "Exchange  Act"), and will take such further action as Alpha
may reasonably  request,  all to the extent required to enable Alpha to sell the
Covered  Shares  pursuant to Form S-3 (or similar  registration  form  hereafter
adopted by the SEC).  Upon  written  request,  SciClone  will deliver to Alpha a
written statement confirming that it is in compliance with such requirements.

                                       8

<PAGE>


     4. No  Transferability  of  Registration  Rights.  The  rights  under  this
Agreement are not transferable other than to the extent and on the same terms as
an assignment of Alpha's rights and obligations are permitted under Section 14.4
of the Acquisition Agreement.

     5.  Lock-up   Agreement.   Alpha  agrees  that,   during  each  consecutive
30-calendar  day period  (the first day of such  period  being  referred to as a
"Lock-up  Release Date")  commencing on the effective  date of the  Registration
Statement, Alpha will limit its resale (i) of Initial Shares to a number that is
equal to one-twelfth  (1/12) of the total number of the Initial Shares, and (ii)
of Additional Shares to a sum equal to 50,000 shares minus the number of Initial
Shares resold,  unless  otherwise  approved by SciClone's prior written consent,
which consent shall not be unreasonably  withheld. A "resale" of shares shall be
deemed  to be made as of the day that  the buy and sell  orders  are  given  and
accepted,  notwithstanding the fact that the closing,  payment and delivery does
not occur until several days thereafter.

     6. No Inconsistent Agreements.  SciClone represents and warrants that as of
the date hereof it has not, and covenants  that after the date of this Agreement
it will not,  enter  into any  agreement  that is  inconsistent  with the rights
granted to Alpha under this Agreement or otherwise conflicts with the provisions
hereof.

     7.  Broker.  All  sales of  Covered  Shares  pursuant  to the  Registration
Statement  shall be made through  Everen  Securities or, if Everen is unable for
any reason to execute or effect such sales,  through  such other broker as shall
be  approved  in writing  by  SciClone,  such  approval  not to be  unreasonably
withheld or delayed.

                                       9

<PAGE>


     8. Notices.  All notices  hereunder  shall be given in the manner  provided
for, and shall be deemed given as provided for in, the Acquisition Agreement.

     9. Definitions.

        Best  Efforts.  "Best  Efforts"  shall mean the  efforts  that a prudent
person  desirous of  achieving a result  would use in similar  circumstances  to
ensure that such result is achieved as expeditiously as is reasonably feasible.

        Damages.  "Damages" shall include any loss, damage,  injury,  decline in
value, lost opportunity,  liability, claim, demand, settlement, judgment, award,
fine, penalty,  tax, fee (including  reasonable  attorneys' fees), charge, costs
(including  reasonable costs of  investigation)  and reasonable  expenses of any
nature.


        Person.  "Person" shall mean any individual,  corporation (including any
non-profit  corporation),  general  partnership,  limited  partnership,  limited
liability  partnership,  joint venture,  estate,  trust,  company (including any
limited  liability  company or joint stock company),  firm or other  enterprise,
association, organization or entity.

        Securities Act.  "Securities Act" shall mean the Securities Act of 1933,
as amended,  or any  substituted  federal  statute and the rules and regulations
thereunder, all as the same shall be in effect at the time.


Executed and delivered as of ____________1998.

SciClone Pharmaceuticals, Inc.

By:_____________________________

Alpha I Biomedicals, Inc.


By:_____________________________

                                       10

<PAGE>


                                    EXHIBIT E

                                 PROMISSORY NOTE
                             and SECURITY AGREEMENT


$280,000 Maximum Principal                                    ____________, 1998
                                                              Bethesda, Maryland


     1. Parties; Promise to Pay. Alpha Biomedicals, Inc., a Delaware corporation
("Alpha"),  hereby  promises  to pay, as  provided  for herein,  to the order of
SciClone Pharmaceuticals,  Inc., a California corporation ("SciClone"),  (i) the
principal  amounts  of the loan  advances  made to Alpha  by  SciClone  that are
referred to in Section 2 hereof and (ii)  interest on such loan  advances to the
extent provided in Section 3 hereof.

     2. Acquisition Agreement. Pursuant to the terms and conditions set forth in
Article  3 of that  certain  Alpha  Rights  Acquisition  Agreement  of even date
between Alpha and SciClone (the "Acquisition Agreement"), SciClone has agreed to
make loan  advances to Alpha of up to $280,000,  in  increments of up to $70,000
per month.

     3.  Interest.  No  interest  shall be payable by Alpha to  SciClone  on the
outstanding  principal  owing  from  time  to  time  on  this  Note,  so long as
installment  payments are made as scheduled pursuant to this Note. To the extent
any sum is not paid when due, such  delinquent sum shall accrue  interest at the
rate of 10% per annum.

     4.  Repayment.  Alpha  shall repay the  principal  balance of this Note and
accrued interest, if any, in monthly installments of $70,000,  commencing on the
earlier of (a) the ninth  Lock-up  Release  Date (as  defined in a Stock  Rights
Agreement  of even date  between  Alpha and  SciClone),  or (b) the next Lock-up
Release Date following the date when Alpha  receives new equity  financing of at
least $500,000. In any event, all outstanding principal and accrued interest, if
any,  shall become fully due and payable not later than May 31, 1999,  if it has
not otherwise  previously become fully due and payable pursuant to the foregoing
schedule.

     5. Default. In the event of any default by Alpha in making any payment when
due under this Note,  SciClone may declare all remaining  unpaid  balances owing
under this Note immediately due and payable. If Alpha does not pay all sums when
due, Alpha shall, to the extent permitted by law, also pay all costs incurred by
SciClone to enforce and collect this Note and enforce this Agreement,  including
attorney's fees and litigation costs.

     6.  General.  Payments  owing on this Note shall be made in lawful money of
the United  States of America.  This Note and  Agreement  have been executed and
delivered  by Alpha in the  State of  Maryland,  but  shall be  governed  by and
construed in accordance with the laws of State of California.

                                       1

<PAGE>


     7. Security.

         7.1 As security  for the  obligations  of Alpha under this Note,  Alpha
hereby  grants to SciClone a security  interest in the number of Initial  Shares
(as defined by the Acquisition  Agreement)  issued by SciClone to Alpha pursuant
to Section 2(b) of the Acquisition  Agreement that is equal to $280,000  divided
by the Initial  Average Price (as defined by the  Acquisition  Agreement),  such
shares being  referred to herein as the  "Collateral  Shares." If, as of the S-3
Effective  Date (as  defined by the  Acquisition  Agreement),  advances to Alpha
pursuant to Sections 3.1 and 3.2 of the Acquisition  Agreement (the "Actual Loan
Amount")  are  less  than   $280,000,   SciClone's   security   interest   shall
automatically  terminate with respect to a percentage of the  Collateral  Shares
equal to the percentage obtained by dividing the difference between $280,000 and
the Actual Loan Amount by $280,000,  such remaining  being referred to herein as
the "Remaining  Collateral Shares." Upon the payment of a monthly installment as
provided in Section 5 hereof,  SciClone's  security interest shall automatically
terminate with respect to the percentage of the Remaining Collateral Shares that
is equal to the  percentage  obtained  by  dividing  the amount of such  monthly
installment by the Actual Loan Amount.

         7.2 To perfect its security interest in the Collateral Shares, SciClone
shall take  possession  of the  certificates  for the  Collateral  Shares at the
Closing.  Upon  the  release  of  SciClone's  security  interest  in  any of the
Collateral  Shares or  Remaining  Collateral  Shares as provided in Section 7.1,
SciClone shall deliver such Collateral Shares or Remaining  Collateral Shares to
Alpha or to such other Person or entity as it is directed by Alpha.

         7.3 The security  interest in the  Collateral  Shares and the Remaining
Collateral  Shares  created  hereby is intended  by  SciClone  and Alpha to have
priority  over any other  security  interest  in the  Collateral  Shares and the
Remaining  Collateral  Shares,  and Alpha  agrees  to  execute  such  additional
documents as SciClone shall reasonably  request to perfect  SciClone's  security
interest in the Collateral Shares and the Remaining Collateral Shares.

         7.4 In the event of any default in the repayment of this Note, SciClone
shall have such rights with respect to the  Collateral  Shares and the Remaining
Collateral Shares as are granted to a secured party by the California Commercial
Code.

         7.5 So long as no  default  occurs  under  this  Note,  Alpha  shall be
entitled to receive all dividends paid or other distributions made on Collateral
Shares and the Remaining  Collateral  Shares and to vote said Collateral  Shares
and the Remaining Collateral Shares in all matters.

     8.  Effectiveness.  This Promissory  Note and Security  Agreement shall not
become  effective,  and shall not create any liability or obligation on the part
of either  party,  unless and until the Closing  (as defined by the  Acquisition
Agreement) shall occur.

                                       2

<PAGE>


         This Note and  Agreement has been executed and delivered as of the date
set forth above.


                                         ALPHA 1 BIOMEDICALS, INC.


                                         By:____________________________________
                                               Michael Berman, Ph.D., CEO

                                       3

<PAGE>


                                    EXHIBIT F

                      Alpha Representations and Warranties


     Subject  only to the  exceptions  specified  in Exhibit G attached  hereto,
Alpha hereby represents and warrants to SciClone as follows:

     1.  Organization.  Alpha is a corporation duly organized,  validly existing
and in good standing under the laws of the State of Delaware.

     2.  Authorization.  This  Agreement has been duly and validly  executed and
delivered  by Alpha,  and  constitutes  a valid and binding  agreement  of Alpha
enforceable  against  Alpha in accordance  with its terms,  except as limited by
laws affecting  creditors' rights generally and except that equitable principals
may limit the right to obtain specific  performance or other equitable remedies.
Each  of the  Stock  Rights  Agreement  and the  Promissory  Note  and  Security
Agreement (collectively, the "Ancillary Documents"), upon execution and delivery
at the Closing,  will be duly and validly  executed  and  delivered by Alpha and
will constitute valid and binding agreements of Alpha, enforceable against Alpha
in accordance with their terms,  except as limited by laws affecting  creditors'
rights  generally and except that  equitable  principles  may limit the right to
obtain specific performance or other equitable remedies. Alpha has all requisite
corporate  power and authority to execute and deliver this  Agreement.  Upon the
approval of this Agreement by the  stockholders  of Alpha in accordance with the
applicable  provisions  of the  Delaware  General  Corporation  Law and  Alpha's
Certificate of Incorporation  and Bylaws  ("Stockholder  Approval"),  Alpha will
have all  requisite  corporate  power and  authority  to execute and deliver the
Ancillary  Documents,  and to carry out the  transactions  contemplated  by this
Agreement and the Ancillary Documents.  Except for the Stockholder Approval, all
necessary  corporate action on the

                                       1

<PAGE>


part  of  Alpha  has  been  taken  to  authorize  the  execution,  delivery  and
performance of this Agreement and the Ancillary Documents.

     3. No Conflicts;  Consents. The execution and the delivery by Alpha of this
Agreement and the Ancillary  Documents do not, and, upon Stockholders  Approval,
the consummation of the transactions  contemplated  hereby will not, result in a
breach of,  constitute a default  (with or without  notice or lapse of time,  or
both) under or violation  of, or result in the  creation of any lien,  charge or
encumbrance  pursuant to any provision of the  Certificate of  Incorporation  or
Bylaws of Alpha, any order, rule, law or regulation of any court or governmental
authority,  foreign or domestic,  or any  provision  of any material  agreement,
instrument,  understanding,  order, judgment or decree to which Alpha is a party
or by which  Alpha or the  Alpha  Rights  are bound or  affected,  nor will such
actions give to any other person or entity  (other than  SciClone) any interests
or  rights  of any  kind,  including  rights  of  termination,  acceleration  or
cancellation,  in or  with  respect  to any  of  the  Alpha  Rights.  Except  as
contemplated  by  this  Agreement,   no  consent  of  any  third  party  or  any
governmental authority is required to be obtained on the part of Alpha to permit
the  consummation  of the  transactions  contemplated  by this Agreement and the
Ancillary Documents.

     4.  Litigation.  There is no action,  suit,  proceeding or investigation in
progress or pending before any court or governmental agency, against or relating
to Alpha or its properties,  assets or business or to the Alpha Rights,  nor, to
the best knowledge of Alpha, any threat thereof or any basis therefor.  Alpha is
not a party to any decree, order or arbitration award (or agreement entered into
in any administrative,  judicial or arbitration proceeding with any governmental
authority) with respect to or affecting the Alpha Rights.

                                       2

<PAGE>


     5. Compliance with Laws and Regulations;  Governmental Permits, Etc. To the
best of Alpha's knowledge,  Alpha is in compliance in all material respects with
all statutes, laws, rules and regulations with respect to or affecting the Alpha
Rights.  To the best of Alpha's  knowledge,  Alpha is not  subject to any order,
injunction or decree issued by any governmental body, agency, authority or court
which  could  impair  the  ability  of  Alpha  to  consummate  the  transactions
contemplated  hereby or which could materially and adversely  affect  SciClone's
use and enjoyment of the Alpha Rights.

     6. Taxes. Alpha has timely filed,  within the time period for filing or any
extension  granted with respect  thereto,  all Federal,  state,  local and other
returns  and  reports  relating  to any and all taxes or any other  governmental
charges,  obligations  or fees for taxes and any related  interest or  penalties
("Tax" or "Taxes")  required to be filed by it with  respect to its business and
the Alpha Rights and such returns and reports are in all material  respects true
and correct.  Alpha has paid all Taxes,  if any,  shown to be due and payable on
said returns and reports and has withheld  with respect to employees all Federal
and state income Taxes,  FICA,  FUTA and other Taxes required to be withheld and
has timely paid all sales,  use and similar  Taxes.  There are no pending or, to
the best of Alpha's  knowledge,  threatened audits,  examinations,  assessments,
asserted  deficiencies  or claims for additional  Taxes.  To the best of Alpha's
knowledge,   there  are  no  liens  or  similar  encumbrances   relating  to  or
attributable to Taxes on the Alpha Rights.

     7.  Accuracy of Material  Facts;  Copies of Materials.  No  representation,
warranty or  covenant of Alpha  contained  in this  Agreement  or in any written
statement  delivered  by Alpha  pursuant  hereto or in  materials  delivered  to
SciClone in connection with the  transactions  contemplated  hereby contains any
untrue  statement of a material  fact known to or believed by Alpha to be untrue
when made, or omits to state material  facts known to or reasonably  believed by

                                       3

<PAGE>


Alpha to be  necessary  in order to make the  statement  contained  therein  not
misleading.  Alpha has delivered to SciClone true,  complete and accurate copies
of each patent, license, contract, agreement and similar document referred to in
any Exhibit hereunder or included in the Alpha Rights.

     8. Financial Statements.  Alpha has delivered to SciClone copies of Alpha's
balance  sheet  as of  September  30,  1997  (the  "Alpha  Balance  Sheet")  and
statements  of income,  stockholders'  equity and cash flows for the  nine-month
period  then  ended.   Such   financial   statements  and  Alpha  Balance  Sheet
(collectively,  the "Alpha Financial Statements") are complete and in accordance
with the books and records of Alpha,  and present fairly the financial  position
of Alpha as of their dates.  Alpha  Financial  Statements  have been prepared in
accordance  with generally  accepted  accounting  principles  applied on a basis
consistent  with  prior  periods,  except  as  otherwise  noted  therein.  Since
September  30,  1997,  there has been no  material  adverse  change  in  Alpha's
financial condition or in the operations of its business.

     9. Proprietary Rights.

         (a) Except as set forth on Exhibit C, there are no agreements  pursuant
to which Alpha has acquired  (and either holds or has  sublicensed)  rights with
respect  to  TA-1.  Assuming  that  SciClone  is in  full  compliance  with  its
obligations  with  respect  to the  Alpha IP  Rights  Agreements  under the 1994
Agreement,  (i) Alpha is not in default  under or in breach or  violation of the
Alpha IP Rights  Agreements  and (ii) to the  knowledge  of Alpha,  the Alpha IP
Rights Agreements, as they relate to the Alpha Rights, are valid and enforceable
and are in full force and effect.

                                       4

<PAGE>


         (b) Except for  SciClone,  Alpha has not granted to any third party any
right,  option,  or right of first  refusal to use any of the Alpha Rights other
than pursuant to agreements that have been terminated.

         (c) No claims have been asserted  against Alpha (and Alpha is not aware
of any claims  that are likely to be asserted  against  Alpha) by any person (i)
challenging the Alpha Rights or (ii)  challenging or questioning the validity or
effectiveness  of any license or agreement to which Alpha is a party relating to
the Alpha Rights.

         (d) Taking into consideration that Alpha, in 1994, licensed to SciClone
all of its rights with  respect to TA-1 not  previously  licensed to SciClone by
Alpha, and SciClone assumed all responsibility for the commercialization of TA-1
worldwide,  and that  since 1994  Alpha has not been  engaged in any  activities
whatsoever involving TA-1, Alpha (i) has no knowledge of any foreign or domestic
patent or patent application or other governmentally  conferred right that would
restrict SciClone from manufacturing, using or selling TA-1, and (ii) to Alpha's
knowledge,  none  of  the  Alpha  Patent  Rights  are  subject  of  any  pending
interference, opposition, cancellation or other protest proceeding.

         (e) All Alpha  Owned  Patent  Rights  listed on  Exhibit  A-1  describe
inventions that were conceived and reduced to practice solely and exclusively by
employees of Alpha  without the  assistance  of any third party or entity (other
than by third  parties who assigned  ownership of their rights to Alpha in valid
and enforceable agreements). All Alpha Owned Patent Rights listed on Exhibit A-2
describe inventions which are owned solely by the parties listed on Exhibit A-2.

                                       5

<PAGE>


         (f) Alpha has at all times  used  commercially  reasonable  efforts  to
treat the Alpha Rights  (other than was disclosed in publicly  available  issued
patents) as containing  trade secrets,  and Alpha has not disclosed or otherwise
dealt  with  such  items in such a manner  as to  cause  the loss of such  trade
secrets by release into the public domain.

         (g) All  employees  of and  consultants  to Alpha  employed or retained
after October 1, 1993, have executed written proprietary  information agreements
with respect to the  non-disclosure  and non-use of the Alpha Rights. To Alpha's
knowledge,  no past or current  employee of Alpha is in violation of any term of
any  employment  contract,  non-disclosure  agreement  or any other  contract or
agreement  relating  to  the  confidentiality  of any  confidential  information
relating to the Alpha Rights.

     10. No Bulk Sale  Notice.  The nature of the Alpha Rights and the nature of
the  business of Alpha are such that  compliance  with Article 5 of the Maryland
Commercial Code (the bulk sale notice law) is not required.

     11. Solvency.  Immediately following the Closing, the fair value of Alpha's
assets  will  exceed  its  liabilities  and Alpha  will be able to  satisfy  its
financial obligations as they become due.

     12. Fair Value.  Alpha believes that the consideration  payable by SciClone
to Alpha pursuant to this Agreement is fair and adequate  consideration relative
to the rights being sold and relinquished by Alpha.

                                       6

<PAGE>


                                    EXHIBIT G

         Schedule of Exceptions to Alpha Representations and Warranties



                                      NONE



<PAGE>


                                    EXHIBIT H

                     SciClone Representations and Warranties


     Subject  only to the  exceptions  specified  in Exhibit I attached  hereto,
SciClone hereby represents and warrants to Alpha as follows:


     1. Organization. SciClone is a corporation duly organized, validly existing
and in good standing under the laws of the State of California.

     2. Authorization This Agreement and the Ancillary  Documents have been duly
and validly  executed and delivered by SciClone and constitute valid and binding
agreements of SciClone,  enforceable  against  SciClone in accordance with their
terms.  SciClone has all requisite  corporate power and authority to execute and
deliver  this  Agreement  and  the  Ancillary  Documents  and to  carry  out the
transactions  contemplated  by this Agreement and the Ancillary  Documents.  All
necessary  corporate  action on the part of SciClone has been taken to authorize
the  execution,  delivery and  performance  of the  Agreement  and the Ancillary
Documents.

     3.  Effect of  Agreement;  Consents.  The  execution  and  delivery of this
Agreement and the Ancillary  Documents by SciClone do not, and the  consummation
of the  transactions  contemplated  hereby and  compliance  with the  provisions
hereof will not,  conflict  with,  result in a breach of,  constitute  a default
(with or without  notice or lapse of time,  or both) under or  violation  of, or
result in the  creation  of any  lien,  charge or  encumbrance  pursuant  to any
provision of the  Articles of  Incorporation  or Bylaws of SciClone,  any order,
rule,  law or  regulation  of any court or  governmental  authority,  foreign or
domestic, or any provision of any material agreement, instrument, understanding,
order,  judgment or decree to which  SciClone is a party or by which SciClone is
bound. No consent of any third party or any  governmental  authority is required
to be  obtained  on the part of  SciClone  to  permit  the  consummation  of the
transactions contemplated by this Agreement or the Ancillary Documents.

                                       1

<PAGE>


     4. Compliance With Other Instruments.  SciClone is not a party to, or bound
by, any  written or oral  contract,  agreement,  license,  indenture,  mortgage,
debenture,  note or other  instrument  under the terms of which  performance  by
SciClone  according to the terms of this  Agreement and the Ancillary  Documents
will be a default or an event of acceleration,  or whereby timely performance by
SciClone  according to the terms of this  Agreement and the Ancillary  Documents
may be prohibited, prevented or delayed.

     5.  Accuracy  of  Material  Facts;  Copies  Materials.  No  representation,
warranty or covenant of SciClone  contained in this  Agreement or in any written
statement  delivered  pursuant  hereto  or in  materials  delivered  to Alpha in
connection with the transactions  contemplated  hereby contains or shall contain
any untrue  statement  of a material  fact known or  believed  to be untrue when
made,  or omits to state  material  facts  known or  reasonably  believed  to be
necessary in order to make the statement contained therein not misleading

     6. Shares. The Shares to be issued by SciClone to Alpha pursuant to Section
2 of this Agreement will be, when issued, (i) duly authorized and validly issued
to Alpha and (ii) fully paid for and  non-assessable.  The  certificates for the
Shares when  delivered to, or at the direction of Alpha,  will be free and clear
of all  liens  or  other  encumbrances,  other  than  customary  securities  law
restrictive legends until the Shares become registered with the SEC.

     7.  Condition  of  SciClone.  SciClone  has  furnished  to Alpha  copies of
SciClone's  most recent  filings with the United States  Securities and Exchange
Commission ("SEC"),  consisting of its Form 10-K for the year ended December 31,
1996, its Form 10-Q for the quarter ended June 30, 1997 and its proxy  statement
for  the  1997  Annual  Meeting,  together  with  SciClone's  annual  report  to
stockholders  for the fiscal year ending December 31, 1996. None of said filings
or the annual report contains any untrue  statement of material fact or omits to
state a material fact  necessary to make the  statements  contained  therein not
misleading  and there 

                                       2

<PAGE>


has not been a material  adverse  change in the  business,  properties,  assets,
condition (financial or other), results of operations,  or prospects of SciClone
since December 31, 1996.

                                       3

<PAGE>


                                    EXHIBIT I

        Schedule of Exceptions to SciClone Representations and Warranties




                                      NONE



<PAGE>


                                    EXHIBIT J

                   No Action Commitments from Alpha Creditors



<PAGE>


                                    EXHIBIT K

                                  Press Release

                                     [LOGO]

                                    SCICLONE
                                 PHARMACEUTICALS


                                    Contact:     Shawn K. Singh
                                                 Vice President
                                                 Corporate Development
                                                    and Communications
                                                 SciClone Pharmaceuticals, Inc.
                                                 650-358-3456


               SciClone Pharmaceuticals Acquires Worldwide Rights
                         to ZADAXIN(R) Thymosin Alpha 1

San Mateo,  CA,  December 17, 1997 -- SciClone  Pharmaceuticals,  Inc.  (Nasdaq:
SCLN) today  announced  the signing of an  agreement  providing  for  SciClone's
acquisition of worldwide  rights to ZADAXIN  thymosin alpha 1,  SciClone's  lead
product,  from  Alpha 1  Biomedicals  (OTC:  ALBM).  SciClone  will no longer be
obligated to pay royalties to Alpha 1 on any of its own or its partners'  future
products sales. Previously, SciClone licensed the product from Alpha 1.

Under the agreement,  which is subject to approval by Alpha 1's stockholders and
certain  other  conditions,  the  aggregate  purchase  price is  $1.93  million,
consisting of $130,000 in cash and $1.8 million of SciClone  common stock priced
at $4.05  per  share (or  approximately  444,000  shares).  The  acquisition  is
expected to close in March 1998.

"Given the  extremely  positive  reception of ZADAXIN by doctors and patients in
our approved markets, this acquisition is a major step in SciClone's strategy to
capitalize  on the  commercial  potential  of the drug  worldwide,"  said Donald
Sellers,   SciClone's  President  and  Chief  Executive  Officer.  "We  are  now
positioned  to  more  efficiently  develop  and  market  ZADAXIN  alone  and  in
partnership with large pharmaceutical  companies,  such as Schering-Plough K.K.,
our exclusive partner in Japan."

ZADAXIN is an  immunomodulator  approved and  marketed for  treatment of chronic
hepatitis B in the People's  Republic of China,  the  Philippines and Singapore.
SciClone  has filed for  approval to market  ZADAXIN for this  indication  in 16
additional countries.

Chronic  hepatitis  B is the  second  most  common  chronic  infectious  disease
worldwide.  The World Health Organization (WHO) estimates that approximately 350
million individuals worldwide (5% of the world's population) are carriers of the
hepatitis B virus, the majority of whom are in Asia.

SciClone  Pharmaceuticals,  Inc. is an international  biopharmaceutical  company
that  acquires,  develops  and  commercializes   specialist-oriented  drugs  for
treating chronic and  life-threatening  diseases for which there are no adequate
treatment  modalities,  including  hepatitis B,  hepatitis  C, cystic  fibrosis,
cancer and immune system disorders. The company's second lead product candidate,
CPX, is in a phase I/II trial for cystic fibrosis.


                         SciClone Pharmaceuticals Inc.
             901 Mariner's Island Blvd. o San Mateo, CA 94404-1593
                   Tel: (650) 358-3456 o Fax: (650) 358-3469
<PAGE>

SciClone Acquires Worldwide Rights to ZADAXIN Thymosin Alpha 1
December 17, 1997
Page 2 of 2

Press releases and corporate information from SciClone Pharmaceuticals, Inc. are
available on the Internet at www.sciclone.com and by fax at 800-996-7256.

The  statements  made in this press  release  contain  certain  forward  looking
statements that involve a number of risks and  uncertainties,  including without
limitation  those  associated  with  regulatory  approvals in other  markets and
market  acceptance  in those markets  where  regulatory  approvals are obtained.
Actual events or results may differ from the Company's expectations. In addition
to the matters  described in this release,  future  actions by the Food and Drug
Administration  or  equivalent  regulatory  authorities  in  foreign  countries,
results of pending or future clinical trials, as well as the risk factors listed
from time to time in the Company's SEC reports, including but not limited to its
Annual  Report on Form  10-K,  may affect the  actual  results  achieved  by the
Company.


                                      # # #


<PAGE>


                              INDEX TO DEFINITIONS

   Term                                                           Location
   ----                                                           --------

1994 Agreement                                                   Recital B


1996 Prepaid Royalty Agreement                                   Recital B


1997 Prepaid Royalty Agreement                                   Recital B


AAA                                                              ss. 14.17


Additional Shares                                                ss. 2(c)


Advances                                                         ss. 3.2


Alpha                                                            Introduction


Alpha Balance Sheet                                              Exhibit F ss. 8


Alpha Financial Statements                                       Exhibit F ss. 8


Alpha Licensed Patent Rights                                     Recital D;
                                                                 Exh. B


Alpha IP Rights Agreements                                       Recital E;
                                                                 Exh. C


Alpha Owned Patent Rights                                        Recital D;
                                                                 Exh. A


Alpha Patent Rights                                              Recital D


Alpha Rights                                                     Recital F


Ancillary Documents                                              Exhibit F ss. 2


Assumed Liabilities                                              ss. 8.1


Average Price                                                    ss. 2(c)


Basket                                                           ss. 12.1


Best Efforts                                                     Exhibit D ss. 9


Cash Consideration                                               ss. 2(a)

Claim(s)                                                         ss. 11.1 &
                                                                 ss. 12.1


Closing                                                          ss. 7.1

                                       i

<PAGE>


                              INDEX TO DEFINITIONS

   Term                                                           Location
   ----                                                           --------

Closing Date                                                     ss. 7.1


Confidential Information                                         ss. 8.2(b)


Covered Shares                                                   Exhibit D 
                                                                 ss. 1.1


Damages                                                          Exhibit D ss. 9


Effective Date                                                   Introduction


Effective Period                                                 Exhibit D
                                                                 ss. 1.1


Exchange Act                                                     Exhibit D
                                                                 ss. 1.2(b)


Initial Average Price                                            ss. 2(b)


Initial Shares                                                   ss. 2(b)


Lock-up Release Date                                             Exhibit Dss. 5


Person                                                           Exhibit D ss. 9

Registration Statement                                           Exhibit D
                                                                 ss. 1.1


Retained Liabilities                                             ss. 8.1


Roche-Basle                                                      Recital E


Roche-US                                                         Recital E


S-3 Effective Date                                               ss. 3.2; 
                                                                 Exhibit D 
                                                                 ss. 1.1


SciClone                                                         Introduction


SciClone Common Stock                                            ss. 2(b)


Securities Act                                                   Exhibit D ss. 9


SEC                                                              ss. 6.1; 
                                                                 Exhibit H
                                                                 ss. 7


Shares                                                           ss. 2(c)


Stockholder Approval                                             Exhibit F ss. 2


Stockholders Meeting                                             6.1

                                       ii

<PAGE>


                              INDEX TO DEFINITIONS

   Term                                                           Location
   ----                                                           --------

Stock Rights Agreement                                           Exhibit D


TA-1                                                             Recital A


Tax or Taxes                                                     Exhibit F ss. 6


Third Party Licensor                                             Recital E

                                      iii



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