SUNPHARM CORPORATION
S-3, 1997-08-08
PHARMACEUTICAL PREPARATIONS
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<PAGE>

    As filed with the Securities and Exchange Commission on August 8, 1997   
                                              Registration No. 333-          
============================================================================ 

                       SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549
                                _______________ 

                                   FORM S-3
           REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933
                                _______________ 

                             SUNPHARM CORPORATION
            (Exact name of registrant as specified in its charter)

            DELAWARE                                     F593097048     
 (State or other jurisdiction of                     (I.R.S. Employer   
  incorporation or organization)                  Identification Number)

                         4651 SALISBURY ROAD, SUITE 205
                          JACKSONVILLE, FLORIDA 32256
                                (904) 296-3320
        (Address, including zip code, and telephone number, including
           area code, of registrant's principal executive offices)

                                  STEFAN BORG
                     PRESIDENT AND CHIEF EXECUTIVE OFFICER
                        4651 SALISBURY ROAD, SUITE 205
                         JACKSONVILLE, FLORIDA 32256
                                (904) 296-3320
           (Name, address, including zip code, and telephone number,
                  including area code, of agent for service)
                                _______________ 

                                  Copies to:
                            ANDREWS & KURTH L.L.P.
                       2170 BUCKTHORNE PLACE, SUITE 150
                          THE WOODLANDS, TEXAS 77380
                                (713) 220-4801
                             ATTN: JEFFREY L. WADE

     APPROXIMATE DATE OF COMMENCEMENT OF PROPOSED SALE TO THE PUBLIC: From time
to time after the effective date of the Registration Statement.   

     If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the following
box.  / / 

     If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or interest
reinvestment plans, check the following box.  /X/ 

     If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act, please check the following box
and list the Securities Act registration statement number of the earlier
effective registration statement for the same offering.  / / 

     If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act, check the following box and list the Securities Act
registration statement number of the earlier effective registration statement
for the same offering. / / 

     If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box.  / / 
                                _______________ 

                          CALCULATION OF REGISTRATION FEE
=============================================================================== 
                                       PROPOSED       PROPOSED                  
 TITLE OF EACH                          MAXIMUM        MAXIMUM                  
   CLASS OF                            OFFERING       AGGREGATE     AMOUNT OF   
 SECURITIES TO        SHARES TO        PRICE PER      OFFERING    REGISTRATION  
BE REGISTERED      BE REGISTERED(1)     SHARE(2)      PRICE(2)       FEE(2)     
- ------------------------------------------------------------------------------- 
Common Stock, par 
 value $.001 per 
 share . . . . . .    1,478,246         $2.71875     $4,018,982      $1,218     
=============================================================================== 
(1)  Consists of (i) 854,260 shares that are outstanding as of the date 
     hereof, (ii) 612,301 shares that are issuable upon exercise of certain 
     warrants, and (iii) 11,685 shares that are issuable upon exercise of 
     certain options.

(2)  Pursuant to Rule 457(c), the registration fee is calculated based upon 
     the average of the high and low sale prices for the Common Stock 
     reported by the Nasdaq Small Cap Market on August 7, 1997.
                                _______________ 

     THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR 
DATES AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL
FILE A FURTHER AMENDMENT WHICH SPECIFICALLY STATES THAT THIS REGISTRATION 
STATEMENT SHALL THEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF 
THE SECURITIES ACT OF 1933 OR UNTIL THE REGISTRATION STATEMENT SHALL BECOME 
EFFECTIVE ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO SAID SECTION 8(a),
MAY DETERMINE.

================================================================================
<PAGE>


INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT.  A 
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE 
SECURITIES AND EXCHANGE COMMISSION.  THESE SECURITIES MAY NOT BE SOLD NOR MAY 
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT 
BECOMES EFFECTIVE.  THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR 
THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE 
SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE 
UNLAWFULL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF 
ANY SUCH STATE.

<PAGE>
                  SUBJECT TO COMPLETION, DATED AUGUST 8, 1997
PROSPECTUS

                             SUNPHARM CORPORATION 

                             1,478,246 SHARES OF  
                                 COMMON STOCK     

     This Prospectus relates to the offering of up to 1,478,146 shares (the 
"Shares") of common stock, par value $.001 per share ("Common Stock") of 
SunPharm Corporation ("SunPharm or the Company") by the selling stockholders 
named herein (the "Selling Stockholders"). The Shares covered by this 
Prospectus consist of (i) 854,260 shares of Common Stock that are issued and 
outstanding as of the date of this Prospectus, (ii) 612,301 shares of Common 
Stock issuable upon the exercise of certain outstanding warrants, and (iii) 
11,685 shares of Common Stock issuable upon the exercise of certain 
outstanding options. The Company will not receive any of the proceeds from 
the sale of Common Stock by the Selling Stockholders other than the 
applicable exercise price per share of the such warrants and options. The 
Company's Common Stock is traded on The Nasdaq Small Cap Market under the 
symbol "SUNP".  On August 7, 1997, the last reported sales price of the Common 
Stock was $2.72 per share.

     All or part of the Shares may be offered by the Selling Stockholders 
from time to time for their own account in transactions on The Nasdaq Small 
Cap Market, in negotiated transactions or otherwise, at market prices 
prevailing at the time of sale, at prices related to such prevailing market 
prices or at negotiated prices. The Selling Stockholders may effect such 
transactions by selling the Shares to or through broker-dealers and such 
broker-dealers may receive compensation in the form of discounts, concessions 
or commission from the Selling Stockholders or the purchasers of the Shares 
for whom such broker-dealers may act as agent or to whom they sell as 
principal or both (which compensation to a particular broker-dealer might be 
in excess of customary commissions).

     None of the proceeds from the sale of the Shares by the Selling 
Stockholders will be received by the Company. The Company has agreed to bear 
certain expenses in connection with the registration and sale of the Shares 
being offered by the Selling Stockholders, and has agreed to indemnify the 
Selling Stockholders against certain liabilities under the Securities Act of 
1933, as amended (the "Securities Act"). The Selling Stockholders and any 
broker-dealers participating in the distribution of the Shares may be deemed 
to be "underwriters" within the meaning of the Securities Act, and any profit 
on the sale of Shares by the Selling Stockholders and any commissions 
received by any such broker-dealer may be deemed to be underwriting 
commissions under the Securities Act. See "Plan of Distribution."

     The Shares have not been registered for sale by the Selling Stockholders 
under the securities laws of any state as of the date of this Prospectus. 
Brokers or dealers effecting transactions in the Shares should confirm 
registration thereof under the securities laws of the states in which such 
transactions occur, or the existence of any exemption from registration.
                               _______________ 

                       THESE ARE SPECULATIVE SECURITIES.
         THE SECURITIES OFFERED HEREBY INVOLVE A HIGH DEGREE OF RISK. 
                    SEE "RISK FACTORS" COMMENCING ON PAGE 5.
                               _______________ 

THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND 
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES
      AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED      
            UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY            
            REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.            
                               _______________                               

                 The date of this Prospectus is        , 1997                

<PAGE>
                                       
                            AVAILABLE INFORMATION

     The Company is subject to the informational requirements of the 
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and, 
accordingly, files reports, proxy statements and other information with the 
Securities and Exchange Commission (the "Commission").  Such reports, proxy 
statements and other information filed with the Commission are available for 
inspection and copying at the public reference facilities maintained by the 
Commission at Room 1024, Judiciary Plaza, 450 Fifth Street, N.W., Washington, 
DC 20549, and at the Commission's Regional Offices located at Citicorp 
Center, 500 West Madison Street, Suite 1400, Chicago, Illinois 60661 and at 
Seven World Trade Center, Suite 1300, New York, New York 10048. Copies of 
such documents may also be obtained from the Public Reference Section of the 
Commission at Judiciary Plaza, 450 Fifth Street, N.W., Washington, DC 20549, 
at prescribed rates. The Commission maintains a site on the World Wide Web at 
http://www.sec.gov that contains reports, proxy statements and other 
information regarding registrants that file electronically with the 
Commission. In addition, such materials and other information concerning the 
Company can be inspected at the National Association of Securities Dealers, 
Inc., 1735 K Street, N.W., Washington, DC 20006.

     The Company has filed with the Commission a registration statement (the 
"Registration Statement") under the Securities Act of 1933, as amended (the 
"Securities Act"), on Form S-3 with respect to the securities offered hereby. 
This Prospectus does not contain all of the information set forth in the 
Registration Statement and the exhibits thereto, certain parts of which are 
omitted in accordance with the rules and regulations of the Commission. 
Statements made in this Prospectus as to the contents of any contract, 
agreement or other document referred to are not necessarily complete. With 
respect to each such contract, agreement or other document filed as an 
exhibit to the Registration Statement, reference is made to the exhibit for a 
more complete description of the matter involved.  The Registration Statement 
and any amendments thereto, including exhibits filed or incorporated by 
reference as a part thereof, are available for inspection and copying at the 
Commission's offices as described above. 
                                       
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE

     The following documents previously filed with the Commission pursuant to 
the Exchange Act (File No. 0-27578) are hereby incorporated by reference into 
this Prospectus:

     1.  The Company's Annual Report on Form 10-KSB for the year ended
         December 31, 1996;

     2.  The Company's Quarterly Report on Form 10-QSB for the quarter ended
         March 31, 1997; 

     3.  The Company's Current Report on Form 8-K dated April 14, 1997; and

     4.  The description of the Common Stock contained in the Company's 
         Registration Statement on Form 8-A filed with the Commission on
         January 18, 1996. 

     All reports and documents filed by the Company pursuant to Section 
13(a), 13(c), 14 or 15(d) of the Exchange Act, prior to the filing of a 
post-effective amendment which indicates that all securities offered hereby 
have been sold or which deregisters all securities then remaining unsold, 
shall be deemed to be incorporated by reference herein and to be a part 
hereof from the respective date of filing of such documents.  Any statement 
contained herein or in a document all or a portion of which is incorporated 
or deemed to be incorporated by reference herein shall be deemed to be 
modified or superseded for purposes of this Prospectus to the extent that a 
statement contained herein or in any other subsequently filed document that 
also is or is deemed to be incorporated by reference herein modifies or 
supersedes such statement. Any such statement so modified or superseded shall 
not be deemed, except as so modified or superseded, to constitute a part of 
this Prospectus.

     THIS PROSPECTUS INCORPORATES DOCUMENTS BY REFERENCE WHICH ARE NOT 
PRESENTED HEREIN OR DELIVERED HEREWITH. THE COMPANY HEREBY UNDERTAKES TO 
PROVIDE WITHOUT CHARGE TO EACH PERSON, INCLUDING ANY BENEFICIAL OWNER, TO 
WHOM A COPY OF THIS PROSPECTUS HAS BEEN DELIVERED, ON THE WRITTEN OR ORAL 
REQUEST OF ANY SUCH PERSON, A COPY OF ANY AND ALL OF THE DOCUMENTS REFERRED 
TO ABOVE WHICH HAVE BEEN OR MAY BE INCORPORATED IN THIS PROSPECTUS BY 
REFERENCE, OTHER THAN EXHIBITS TO SUCH DOCUMENTS (UNLESS SUCH EXHIBITS ARE 
SPECIFICALLY INCORPORATED BY REFERENCE INTO SUCH DOCUMENTS).  SUCH REQUESTS 
FOR DOCUMENTS SHOULD BE DIRECTED TO SUNPHARM CORPORATION, 4651 SALISBURY 
ROAD, SUITE 205, JACKSONVILLE, FLORIDA 32256, ATTENTION: STEFAN BORG, 
TELEPHONE NUMBER (904) 296-3320. 

     No person is authorized to give any information or to make any 
representation not contained in this Prospectus, and, if given or made, such 
information or representation must not be relied upon as having been 
authorized. This 

                                      -2- 
<PAGE>

Prospectus does not constitute an offer to sell, or a solicitation of an 
offer to purchase, any of the securities offered by this Prospectus, or the 
solicitation of a proxy, in any jurisdiction in which, or to any person to 
whom, it is unlawful to make such offer or solicitation of an offer or proxy 
solicitation.  Neither the delivery of this Prospectus nor any distribution 
of the securities offered hereby shall, under any circumstances, create any 
implication that the information contained herein is correct as of any time 
subsequent to the date hereof or that there has been no change in the affairs 
of the Company since the date hereof.

























                                      -3- 
<PAGE>
                                 THE COMPANY

     THE FOLLOWING IS QUALIFIED IN ITS ENTIRETY BY THE MORE DETAILED 
INFORMATION INCLUDING "RISK FACTORS" APPEARING ELSEWHERE IN THIS PROSPECTUS 
AND THE FINANCIAL STATEMENTS AND NOTES THERETO CONTAINED IN THE COMPANY'S 
ANNUAL REPORT ON FORM 10-K FOR THE YEAR ENDED DECEMBER 31, 1996, INCORPORATED 
BY REFERENCE HEREIN (THE "ANNUAL REPORT"). EXCEPT FOR THE HISTORICAL 
INFORMATION CONTAINED HEREIN, THE DISCUSSION IN THIS PROSPECTUS CONTAINS 
FORWARD-LOOKING STATEMENTS THAT INVOLVE RISKS AND UNCERTAINTIES. THE 
COMPANY'S ACTUAL RESULTS COULD DIFFER MATERIALLY FROM THOSE DISCUSSED HEREIN. 
FACTORS THAT COULD CAUSE OR CONTRIBUTE TO SUCH DIFFERENCES INCLUDE, BUT ARE 
NOT LIMITED TO, THOSE DISCUSSED IN "RISK FACTORS" BEGINNING AT PAGE 4 OF THIS 
PROSPECTUS AND THOSE DISCUSSED IN "MANAGEMENT'S DISCUSSION AND ANALYSIS OF 
FINANCIAL CONDITION AND RESULTS OF OPERATIONS" AND "BUSINESS" CONTAINED IN 
THE ANNUAL REPORT, AS WELL THOSE DISCUSSED ELSEWHERE IN THE PROSPECTUS, THE 
ANNUAL REPORT OR ANY OTHER DOCUMENT INCORPORATED BY REFERENCE HEREIN PRIOR TO 
THE TERMINATION OF THE OFFERING.

     SunPharm Corporation ("SunPharm" or the "Company") is a development 
stage company engaged in the development of small molecule pharmaceutical 
products, consisting of novel polyamine analogues and other proprietary 
compounds invented at the University of Florida and licensed exclusively 
worldwide to the Company. The Company's drug development efforts are centered 
around three main areas: (i) cancer, (ii) acquired immunodeficiency syndrome 
("AIDS") and (iii) gastrointestinal disorders. The Company currently has 13 
potential products in various stages of research or development. 

     Three of the Company's polyamine analogue products are in Phase I or II 
human clinical trials. Diethylhomospermine ("DEHOP") is currently in Phase II 
human clinical trials for the treatment of AIDS-related chronic diarrhea. 
DEHOP is also in a Phase I clinical trial for cancer, commenced in September 
1996 under the supervision of the University of Wisconsin through a federal 
grant from the National Cancer Institute.  Another of the Company's products, 
diethylnorspermine ("DENSPM"), recently reached the maximum tolerated dose in 
a Phase I human clinical trial for the treatment of refractory solid cancer. 
The Investigational New Drug ("IND") application relating to DENSPM was 
transferred to the Company's strategic alliance partner, Warner-Lambert 
Company ("Warner-Lambert").  Warner-Lambert is expected to commence Phase II 
clinical trials of DENSPM in the second half of 1997. 

     The Company's strategy is to develop products both independently and 
through strategic alliances, pursuant to which the Company will seek 
financial, preclinical and clinical trial and marketing assistance from 
larger pharmaceutical companies for drugs with broad market potential, while 
retaining parallel manufacturing and/or marketing rights for all or part of 
those markets. Consistent with this strategy, the Company sublicensed 
worldwide rights (excluding Japan) to manufacture and market DENSPM for all 
cancer applications to Warner-Lambert in May 1993 and sublicensed such rights 
in Japan to Nippon Kayaku Co., Ltd. ("Nippon Kayaku") in February 1994. 
Warner-Lambert and Nippon Kayaku have agreed to make staged payments to 
SunPharm for license fees and research and development milestones, of which 
an aggregate of $2.85 million has been paid to date, and to pay royalties for 
sales of products incorporating DENSPM.  In addition, Warner-Lambert and 
Nippon Kayaku have agreed to fund and administer all further human clinical 
trials which may be conducted for DENSPM.

     The Company was incorporated in Delaware in 1990 as Lexigen, Incorporated
and in 1991 changed its name to SunPharm Corporation. The Company's principal
executive offices are located at 4651 Salisbury Road, Suite 205, Jacksonville,
Florida 32256 (telephone number (904) 296-3320). SunPharm supports a principal
research facility at the University of Florida in Gainesville, Florida.










                                      -4- 
<PAGE>
                                 RISK FACTORS

     IN EVALUATING THE COMPANY AND ITS BUSINESS, PROSPECTIVE INVESTORS SHOULD
CAREFULLY CONSIDER THE FOLLOWING RISK FACTORS, TOGETHER WITH THE INFORMATION AND
FINANCIAL DATA SET FORTH IN THE REPORTS AND DOCUMENTS INCORPORATED BY REFERENCED
HEREIN, PRIOR TO PURCHASING ANY SHARES OF COMMON STOCK OFFERED HEREBY. 

DEVELOPMENT STAGE COMPANY

     The Company is in the development stage and has realized only limited
revenues, all of which have been derived from payments from Warner-Lambert and
Nippon Kayaku in connection with license fees and achieving identified research
milestones with respect to DENSPM. The Company has generated no revenues from
product sales, and it does not expect to generate revenue from product sales for
at least several years. The Company has incurred net losses since commencement
of its operations and it expects to continue to incur losses for the foreseeable
future.  As of June 30, 1997, the Company had an accumulated deficit of $13.5
million.  Moreover,  there can be no assurance that the Company will
successfully complete the transition from a development company to successful
operations and/or profitability.

NO ASSURANCE OF SUCCESSFUL PRODUCT DEVELOPMENT OR COMMERCIALIZATION

     Since its inception, the Company has devoted its efforts exclusively to the
research and development of potential pharmaceutical products based primarily
upon its licensed polyamine analogue and metal chelator technologies. While one
of the Company's polyamine analogues, DEHOP, is presently in Phase II human
clinical trials, and another analogue, DENSPM, has competed Phase I human
clinical trials, such trials will not be sufficient to demonstrate their safety
or efficacy, and substantial further human clinical trials must be successfully
completed before such products may be approved for commercialization. There can
be no assurance that DEHOP or DENSPM, or any other potential product currently
in development or developed in the future, will prove to be safe or effective in
clinical trials, meet applicable regulatory standards, be capable of being
produced in commercial quantities at acceptable cost or be successfully 
marketed.

NEED FOR ADDITIONAL FINANCING

     The Company has experienced negative cash flows from operations since its
inception and has funded its activities to date primarily from equity
financings.  The Company has expended and will continue to expend substantial
funds to continue the research and development of its products, conduct
preclinical and clinical trials, establish clinical and commercial scale
manufacturing in its own facilities or in the facilities of others and market
its products.  The amount and timing of such expenditures are subject to a
number of factors. Based on its current operating plan, the Company anticipates
that its existing capital resources will be adequate to satisfy its capital
needs through the first quarter of 1999, but will not be sufficient to fund the
Company's operations to the point of introduction of a commercially successful
product.  The Company's rights to receive payments from Warner-Lambert and
Nippon Kayaku are dependent upon the achievement of certain development and
commercialization milestones by Warner-Lambert and Nippon Kayaku, respectively,
and are not within the control of the Company. Further, the capability of
Warner-Lambert and Nippon Kayaku to achieve such milestones depends upon the
availability and/or prioritization of sufficient funding to support necessary
testing of DENSPM, the availability of trained and experienced staff for testing
and the results of such testing, among other factors. As a result, no assurance
can be made that such milestones will be achieved or that such payments will be
received by the Company.

     The Company will require significant levels of additional capital, which it
intends to raise through additional equity or debt financing, additional
arrangements with corporate partners or from other sources. No assurance can be
given that the necessary funds will be available for the Company to finance its
development on acceptable terms or at all. If adequate funds are not available,
the Company may be required to curtail significantly one or more of its research
or development programs, or it may be required to obtain funds through
arrangements with future collaborative partners or others that may require the
Company to relinquish rights to some or all of its technologies or products.

                                      -5- 
<PAGE>

GOVERNMENT REGULATION; NO ASSURANCE OF REGULATORY APPROVAL

     Research, preclinical development, clinical trials and the manufacturing
and marketing of therapeutic products under development by the Company are
subject to extensive regulation by government authorities in the United States
and other countries, including, but not limited to, the United States Food and
Drug Administration ("FDA"). In order to obtain approval to commercialize a
product, the Company must demonstrate to the satisfaction of the FDA and
comparable authorities in other countries that such product is safe and
effective for its intended uses and that the Company is capable of manufacturing
the product to the applicable standards. In the United States, this requires
that the product undergo extensive preclinical testing, that the Company file an
IND with the FDA prior to commencing human clinical trials and that the Company
file a New Drug Application requesting FDA approval for commercial marketing of
the product. 

     The approval process for the Company's product candidates is likely to take
at least several years and will involve significant expenditures for which
additional financing will be required. The cost to the Company of conducting
human clinical trials for any potential product can vary dramatically based on a
number of factors, including the order and timing of clinical indications
pursued and the extent of development and financial support, if any, from
corporate partners. Although Phase I and Phase II clinical trials of DENSPM and
DEHOP, respectively, are presently being conducted, further clinical trials,
including large, time-consuming and more costly Phase II and Phase III clinical
trials, will be required to demonstrate the safety and efficacy of DENSPM and
DEHOP.  There can be no assurance that the Company will have sufficient
resources to complete the required regulatory review process or that the Company
could survive the inability to obtain, or delays in obtaining, such approvals. 
Moreover, even if regulatory approval of a drug is granted, such approval may
entail limitations on the indicated uses for which it may be marketed.
Furthermore, a marketed drug, its manufacturer and its manufacturing facilities
are subject to continual review and periodic inspections, and later discovery of
previously unknown problems with a product, manufacturer or facility may result
in restrictions on the product or manufacturers, including a withdrawal of the
product from the market.  Failure to comply with the applicable regulatory
requirements can, among other things, result in fines, suspensions of regulatory
approvals, product recalls, operating restrictions and criminal prosecution.
Further, additional government regulation may be established that could prevent
or delay regulatory approval of the Company's products. 

DEPENDENCE ON EXCLUSIVE LICENSE

     All of the Company's development and commercialization rights for its
products are derived from its license agreement with the University of Florida
Research Foundation, Inc. (the "Foundation"). The Company's rights under the
license agreement are subject to early termination under certain circumstances,
including failure to pay royalties or other material breach by the Company,
bankruptcy of the Company or failure by the Company to carry on its business,
failure to commence marketing of a licensed product within six months of
approval in any specific market, and failure to comply with the terms of the
Company's sponsored research agreement with the University of Florida, among
others.  In the event that the license agreement terminates for any reason, the
Company's rights to manufacture and market DEHOP and DENSPM and its other
products would terminate.  

LIMITED PERSONNEL; RELIANCE ON STRATEGIC ALLIANCES; RELIANCE ON COLLABORATIVE 
ARRANGEMENTS FOR RESEARCH AND DEVELOPMENT

     SunPharm has only five full-time employees and one part-time employee and
is substantially dependent on third parties, with all of the risks attendant
thereto, to conduct research and development, to conduct clinical trials of the
Company's potential products and to manufacture DEHOP, DENSPM and other
compounds for such research and development.  

     The Company is dependent upon the University of Florida and Dr. Raymond
Bergeron, the inventor of the Company's technology, with respect to all research
and most early preclinical development of its potential products. The Company
does not have, and has no immediate plans to construct, a laboratory facility.
The Company has no control over the facilities where the research and
development work is being performed or over the personnel performing such work.
If the University of Florida breaches its obligations under its agreement with
the Company, the Company's remedies may be limited by applicable law affecting
actions against state agencies. 

                                      -6- 
<PAGE>

     The Company benefits significantly from and is dependent upon 
collaborative arrangements with the University of Florida and Dr. Bergeron. 
Although the Company believes that its relationships with its collaborators 
are good, there can be no assurance that the Company's relationships with 
such institutions and individuals will continue. The loss of these 
relationships would significantly increase the Company's expenses and could 
have a substantial negative effect on the Company's ability to attain its 
long-range objectives. 

     The Company is dependent upon strategic alliances with Warner-Lambert 
and Nippon Kayaku with respect to the development and commercialization of 
DENSPM, and expects to rely upon future strategic alliances with other 
pharmaceutical companies with respect to other potential products.  Although 
the Company believes that Warner-Lambert, Nippon Kayaku and any future 
strategic alliance partners have or will have an economic motivation to 
develop and commercialize such products, the amount and timing of resources 
to be devoted to these activities are not within the control of the Company 
and will be subject to the priorities of such strategic alliance partners in 
allocating these resources, which may not be consistent with the best 
interests of the Company. In addition, the Company's strategic alliance 
partners or their affiliates may be pursuing alternative products or 
technologies which may compete with the Company's products and technologies.  
No assurances can be given that the Company's agreements with Warner-Lambert 
and Nippon Kayaku, or with any other strategic alliances the Company may 
enter in the future, will result in the successful development or 
commercialization of DENSPM or other potential products, or that any such 
agreements will result in any significant revenues, profits or cost savings 
to the Company. Furthermore, no assurances can be given that the Company will 
be able to enter into future strategic alliance agreements on favorable terms 
or at all. In addition, the Company's strategic alliance partners or their 
affiliates may be pursuing alternative products or technologies which may 
compete with the Company's products and technologies.

UNCERTAINTIES AS TO PATENTS AND PROPRIETARY TECHNOLOGIES

     Subject to a nonexclusive statutory license to the United States 
government, the Company is the exclusive licensee of more than 25 issued 
United States and foreign patents and numerous pending patent applications. 
The Company is required to meet specified milestone and diligence 
requirements in order to retain its license to the patents and other 
proprietary rights licensed from the Foundation.  No assurance can be given 
that the Company will satisfy any of these requirements. 

     The patent position of pharmaceutical companies generally is highly 
uncertain and involves complex legal and factual questions. There can be no 
assurance that the patents licensed from the Foundation will provide 
substantial protection or commercial benefit to the Company, afford the 
Company adequate protection from competing products, or not be challenged or 
declared invalid or that additional related United States or foreign patents 
will be issued, the occurrence of any of which could have a material adverse 
effect on the Company's operations.  The United States government could use 
its rights as licensee of the Foundation's patents to increase the supply of 
products based on such patents or to reduce the cost of treatment with such 
products.

     Certain proprietary trade secrets and unpatented know-how are important 
to the Company.  There can be no assurance that others may not independently 
develop the same or similar technologies. Although the Company has taken 
steps to protect its trade secrets and unpatented know-how, third parties 
nonetheless may gain access to such information. 

     There has been significant litigation in the biotechnology and 
pharmaceutical industry regarding patents and other proprietary rights. If 
the Company became involved in similar litigation regarding its intellectual 
property rights, the cost of such litigation could be substantial. 

     The limited capital resources of the Company could significantly 
adversely affect its ability to enforce or defend its intellectual property 
rights, especially against companies which have substantially more resources.


                                     -7-

<PAGE>

UNCERTAINTY OF HEALTH CARE REFORM MEASURES; THIRD-PARTY REIMBURSEMENT

     The Company's ability to successfully commercialize its products may 
depend in part on the extent to which reimbursement for the costs of such 
products and related treatments will be available from government health 
administration authorities, private health coverage insurers and other 
organizations.  While the legislative and regulatory proposals of President 
Clinton to reform the health care system have been tabled temporarily and 
while the Company cannot predict whether any such future legislative or 
regulatory proposals will be adopted, the pendency of such proposals could 
have a material adverse effect on the Company's ability to raise capital. Any 
such reform measures, if adopted, could adversely affect the pricing of 
therapeutic products in the United States or the amount of reimbursement 
available from United States governmental agencies or third party insurers 
and could materially adversely affect the Company in general. Furthermore, 
the Company's ability to commercialize its potential product portfolio may be 
adversely affected to the extent that such proposals have a material adverse 
effect on the business, financial condition and profitability of other 
companies that are prospective collaborators for certain of the Company's 
proposed products.

     In both domestic and foreign markets, sales of the Company's proposed 
products will depend in part on the availability of reimbursement from 
third-party payors such as government health administration authorities, 
private health insurers and other organizations. Third-party payors are 
increasingly challenging the price and cost effectiveness of medical products 
and services. Significant uncertainty exists as to the reimbursement status 
of newly approved health care products.  There can be no assurance that the 
Company's proposed products will be considered cost effective or that 
adequate third-party reimbursement will be available to enable the Company to 
maintain price levels sufficient to realize an appropriate return on its 
investment in product development.  Legislation and regulations affecting the 
pricing of pharmaceuticals may change before any of the Company's proposed 
products are approved for marketing.  Adoption of such legislation or 
regulations could further limit reimbursement for medical products and services.

COMPETITION; RAPID TECHNOLOGICAL CHANGE

     The Company is engaged in pharmaceutical product development 
characterized by extensive research efforts and rapid technological progress. 
There are many pharmaceutical companies, biotechnology companies, public 
and private universities, and research organizations actively engaged in 
research and development of products that may be similar to, or seek to 
attack the same targets as, SunPharm's products. Many of the Company's 
existing or potential competitors have substantially greater financial, 
technical, and human resources than the Company and may be better equipped to 
develop, manufacture, and market products.  These companies may develop and 
introduce products and processes competitive with or superior to those of the 
Company. In addition, other technologies or products may be developed that 
have an entirely different approach or means of accomplishing the intended 
purposes of the Company's products, which might render the Company's 
technology and products uncompetitive or obsolete. There can be no assurance 
that the Company will be able to compete successfully.

RELIANCE ON FOUNDER

     The Company is highly dependent upon Stefan Borg, its founder, President 
and Chief Executive Officer.  The loss of Mr. Borg's services could have a 
material adverse effect on the Company.

PRODUCT LIABILITY EXPOSURE; LIMITED INSURANCE COVERAGE

     The testing, marketing and sale of pharmaceutical products entails a 
risk of product liability claims by consumers and others and such claims may 
be asserted against the Company. The Company does not maintain product 
liability insurance coverage other than $1,000,000 of primary and $1,000,000 
of excess product liability coverage applicable only for DENSPM and DEHOP for 
the Phase I human clinical trials of DENSPM Phase I and Phase II human 
clinical trials of DEHOP, and, prior to marketing any product, there can be 
no assurance it will be able to obtain such insurance at a reasonable cost or 
in an amount sufficient to cover all possible liabilities. In the event of a 
successful product liability suit against the Company, lack or insufficiency 
of insurance coverage could have a material adverse effect on the Company. 
Further, SunPharm is required to indemnify the University of Florida and its 
trustees, officers, employees and affiliates against claims resulting from 
the manufacture or sale of products derived from its polyamine 

                                     -8-
<PAGE>

compounds and to have product liability coverage naming the University of 
Florida as an additional insured for such risks.

LACK OF MANUFACTURING EXPERIENCE OR FACILITIES

     The Company currently contracts with third parties for the production of 
compounds in limited quantities for its preclinical and clinical trials and 
currently does not possess the staff or facilities necessary to manufacture 
products in commercial quantities. The Company has entered into an agreement, 
however, for the production of clinical-scale quantities of its products by 
third party contractors which it believes capable of supplying its short-term 
requirements.  There can be no assurance that the polyamine compounds or iron 
chelators can be manufactured by the Company or its suppliers at a cost or in 
quantities necessary to make such compounds commercially viable products. The 
Company also may encounter significant delays in obtaining supplies from 
third-party manufacturers or experience interruptions in its supplies. If the 
Company is unable to obtain adequate supplies, its business would be 
materially adversely affected. 

VOLATILITY OF STOCK PRICE; LIQUIDATION PREFERENCE; LACK OF DIVIDENDS

     The market prices for securities of biopharmaceutical companies 
historically have been highly volatile. Announcements concerning the Company 
or its competitors, including the results of testing and clinical trials, 
technological innovations, or commercial products, government regulations, 
developments concerning proprietary rights, including patents and litigation 
matters, a change in status of a collaborative partner, public concern 
relating to the commercial value or safety of the Company's products, and 
stock market conditions in general may have a significant impact on the price 
of the Common Stock.

     The Company has not paid dividends on its Common Stock since its 
inception and does not intend to pay any such dividends in the foreseeable 
future. For the years ended December 31, 1994, 1995 and 1996, and the six 
months ended June 30, 1997, the Company incurred net losses of $2,159,001, 
$4,369,653, $2,836,609 and $1,867,119, respectively.

SHARES ELIGIBLE FOR FUTURE SALE

     Sales of a substantial number of shares of Common Stock in the public 
market could adversely affect the market price of the Common Stock. Of the 
5,667,471 shares of Common Stock outstanding as of July 31, 1997, (i) 
3,839,185 shares (including the Shares offered hereby that are presently 
outstanding) are eligible for sale without restriction under the Securities 
Act (except for shares of Common Stock held by affiliates of the Company 
whose shares may be sold subject to the volume limitations and certain other 
requirements of Rule 144 under the Securities Act) or have been registered 
for resale under the Securities Act and (ii) 1,828,286 shares are restricted 
securities that may not be resold unless the resale is registered under the 
Securities Act or it is made subject to the volume limitations and other 
restrictions of Rule 144 or another exemption from registration under the 
Securities Act. As of July 31, 1997, 5,203,376 shares of Common Stock (or 
47.9% of the total number of shares outstanding on a fully diluted basis) 
were issuable upon the exercise of outstanding options and warrants, of which 
the issuance or resale of 1,564,045 shares (including the Shares offered 
hereby that are issuable upon the exercise of  warrants or options) has been 
registered under the Securities Act. Additional shares may be issued upon the 
conversion of preferred stock in the event that the Company issues any shares 
of preferred stock. The existence of such warrants, options and convertible 
securities, as well as certain registration rights, may adversely affect the 
terms on which the Company may obtain additional equity financing.

CONCENTRATION OF STOCK OWNERSHIP; FACTORS INHIBITING TAKEOVER

     As of July 31, 1997, the Company's executive officers and directors 
beneficially owned approximately 40.7% of the outstanding Common Stock. As a 
result, such persons will have a substantial influence on the Company's 
affairs and business.  In addition, the Company's Board of Directors can, 
without obtaining stockholder approval, issue shares of preferred stock 
having rights that could adversely effect the voting power of holders of the 
Common Stock. Also, Section 203 of the Delaware General Corporation Law 
restricts certain business combinations with any interested stockholder as 
defined by such statute.  Any of the foregoing factors may delay, defer or 
prevent a change in control of the Company. See "Description of Securities."


                                     -9-

<PAGE>

FORWARD-LOOKING STATEMENTS AND ASSOCIATED RISKS

     This Prospectus contains forward-looking statements.  The words anticipate,
believe, expect, estimate, project and similar expressions are intended to 
identify forward-looking statements. Such statements reflect the Company's 
current views with respect to future events and financial performance and are 
subject to certain risks, uncertainties and assumptions, including the risk 
factors set forth above. Should one or more of these risks or uncertainties 
materialize, or should underlying assumptions prove incorrect, actual results 
may vary materially from those anticipated, believed, expected, estimated or 
projected. 

                                USE OF PROCEEDS

     The Company intends to use the proceeds from the exercise of warrants 
and options, if any are exercised, for human clinical trials of DEHOP and 
DENSPM, research and development of other potential products and general 
corporate purposes.  The Company will not receive any proceeds from sales, if 
any, of shares of Common Stock by the Selling Stockholders to the public. 


                                    -10-

<PAGE>
                                       
                            SELLING STOCKHOLDERS

   The Shares covered by this Prospectus consist of (i) 854,260 shares of 
Common Stock that are issued and outstanding as of the date of this 
Prospectus, (ii) 612,301 shares of Common Stock issuable upon the exercise of 
certain outstanding warrants, and (iii) 11,685 shares of Common Stock 
issuable upon the exercise of certain outstanding options. 

   During the year ended December 31, 1996, the Company completed the private 
placement of 537,623 units pursuant to Section 4(2) of the Securities Act of 
1933 for $5.50 per unit.  Each unit consisted of one share of the Company's 
Common Stock and one redeemable Common Stock Purchase Warrant. The warrants 
included in the units had an original expiration date of four years from the 
date of issuance and original exercise prices of $5.50 per share until the 
first anniversary date, $6.50 per share until the second anniversary date, 
and $7.50 per share thereafter. The warrants are subject to redemption by the 
Company at $0.01 per warrant, provided the Company's Common Stock closes at a 
price (under the terms of such warrants as originally issued) of $8.50, $9.50 
or $10.50 per share for 20 consecutive days during the second, third or 
fourth years, respectively, of the term of the warrant. Proceeds from the 
private placement were approximately $2,636,000 net of placement agent and 
other costs of approximately $321,000.

   Also during 1996, the Company offered certain of its existing warrant 
holders a 30% reduction in their applicable exercise price if they exercised 
their warrants prior to December 31, 1996. Additionally, for each four 
warrants exercised, participants were issued a warrant identical to the 
warrants issued in the private placement. As a result of this warrant 
exchange offer, 236,721 outstanding warrants were exercised in exchange for 
236,721 shares of Company Stock and 59,178 new warrants.  Proceeds from the 
warrant exchange were approximately $459,000, net offering costs of 
approximately $34,000.

   In April 1997, the Company offered to reduce the exercise price of the 
warrants issued in the 1996 private placement and warrant exchange offer to 
$3.00 per share, to extend the expiration date of the warrants to March 31, 
2001, and to increase the price per share at which the Common Stock must 
trade to permit the Company to redeem the warrants to $16.00, $20.00 and 
$24.00 for 20 consecutive days during the years ending March 31, 1999, 2000 
or 2001, respectively.  The holders of warrants exercisable for an aggregate
561,679 shares agreed to such modifications, in consideration for their 
consent and waiver with respect to the Company's sale of Common Stock and 
warrants to certain institutional investors in March 1997.

   The Shares offered hereby include shares of Common Stock sold to the 
Selling Stockholders in the Company's 1996 private placement and warrant 
exchange offer, as well as shares issuable upon the exercise of warrants 
issued in such transactions, pursuant to the Company's agreement to file a 
registration statement covering the resale of such shares by such Selling 
Stockholders. In addition, the Shares include certain shares of Common Stock 
issuable upon the exercise of warrants and options issued prior to the 
Company's 1995 initial public offering, pursuant to certain "piggyback"
registration rights of the holders of such options and warrants.

   The following table sets forth the names of the Selling Stockholders, the 
number of shares of Common Stock (including the shares issuable upon the 
exercise of the warrants and options) beneficially owned by each of them as 
of the date of this Prospectus, the number of shares covered by this 
Prospectus and the amount of shares to be held by each of them after the 
offering covered by this Prospectus (assuming that all shares subject to this 
Prospectus are sold).

<TABLE>
                                                                                                          COMMON STOCK
                                                                 SHARES OF COMMON STOCK                BENEFICIALLY OWNED
                                           SHARES OF           COVERED BY THIS PROSPECTUS             AFTER THE OFFERING(1)
                                          COMMON STOCK    -------------------------------------     --------------------------
                                       BENEFICIALLY OWNED              ISSUABLE UPON
                                           PRIOR TO                     EXERCISE OF                  NUMBER
NAME OF SELLING STOCKHOLDER              THE OFFERING(1)  OUTSTANDING     WARRANTS        TOTAL     OF SHARES     PERCENTAGE
- ---------------------------            ------------------ -----------  --------------     -----     ---------     ----------
<S>                                    <C>                <C>          <C>               <C>        <C>           <C>
Fred M. Cone, Jr.                             5,000          2,500          2,500         5,000          --             *
Jerome Goldberg                              10,000          5,000          5,000        10,000          --             *
Stanley and Lesley Berkovitz                  7,000          3,500          3,500         7,000          --             *
Richard M. Lilly TTEE                                                                 
Richard M. Lilly Revocable Trust             20,000         10,000         10,000        20,000          --             *
</TABLE>

                                      -11-
<PAGE>
<TABLE>
                                                                                                          COMMON STOCK
                                                                 SHARES OF COMMON STOCK                BENEFICIALLY OWNED
                                           SHARES OF           COVERED BY THIS PROSPECTUS             AFTER THE OFFERING(1)
                                          COMMON STOCK    -------------------------------------     --------------------------
                                       BENEFICIALLY OWNED              ISSUABLE UPON
                                           PRIOR TO                     EXERCISE OF                  NUMBER
NAME OF SELLING STOCKHOLDER              THE OFFERING(1)  OUTSTANDING     WARRANTS        TOTAL     OF SHARES     PERCENTAGE
- ---------------------------            ------------------ -----------  --------------     -----     ---------     ----------
<S>                                    <C>                <C>          <C>               <C>        <C>           <C>
Michael Lilly                                10,000          5,000          5,000        10,000          --             *
Nicholas Lilly                                2,000          1,000          1,000         2,000          --             *
James Lilly                                   2,000          1,000          1,000         2,000          --             *
David Zarchan                                27,272         13,636         13,636        27,272          --             *
Adolf Bohn                                   72,720         36,360         36,360        72,720          --             *
KG Associates                                13,500          6,750          6,750        13,500          --             *
Henri Zimmerli                               30,000         15,000         15,000        30,000          --             *
Tini D. Lilly IRA                             6,000          3,000          3,000         6,000          --             *
Mary E. Stuart                               18,180          9,090          9,090        18,180          --             *
JWM Partners                                  9,092          4,546          4,546         9,092          --             *
Universal Partners, L.P.                     14,286         11,429          2,857        14,286          --             *
George F. Bowles, Trustee
Bowles Trust                                 28,571         22,857          5,714        28,571          --             *
Elliot S. Schlissel and Lois Schlissel       14,286         11,429          2,857        14,286          --             *
Jacqueline Lesley Towell                     14,286         11,429          2,857        14,286          --             *
Thomas Brazier and Paulette Butler            7,142          5,714          1,428         7,142          --             *
SunPharm Investors, L.P.                    199,802        159,842         39,960       199,802          --             *
Julian J. D'Agostine                         18,180          9,090          9,090        18,180          --             *
Hans Bergman                                 10,000          5,000          5,000        10,000          --             *
Dr. Ben-Ami Feit and Ora Feit JTWROS          4,000          2,000          2,000         4,000          --             *
Ran Feit                                      6,508          3,254          3,254         6,508          --             *
Moshe Malki                                   6,000          3,000          3,000         6,000          --             *
Guy Perkins                                  20,000         10,000         10,000        20,000          --             *
Dr. Thierry Waelli                           40,000         20,000         20,000        40,000          --             *
Isabelle Fischer                             40,000         20,000         20,000        40,000          --             *
Menachem Benbassat                            4,000          2,000          2,000         4,000          --             *
Gottfried Hofmann                            80,000         40,000         40,000        80,000          --             *
Lewinger Family L.P.                        100,000         50,000         50,000       100,000          --             *
Peter Bollmann                               10,000          5,000          5,000        10,000          --             *
Earlsward Limited                            80,000         40,000         40,000        80,000          --             *
Veldan Olten Inc.                            80,000         40,000         40,000        80,000          --             *
Peter Waelli                                 60,000         30,000         30,000        60,000          --             *
Henri Chalhoub                               20,000         10,000         10,000        20,000          --             *
Donald E. Kaplan                              6,000          3,000          3,000         6,000          --             *
Carl J. Domino                               20,000         10,000         10,000        20,000          --             *
W. Richard and Lori J. Lueck                 25,600         12,800         12,800        25,600          --             *
Miller Advisory Corp. Pension Plan
& Trust, Ronald L. Miller, Trustee           10,000          5,000          5,000        10,000          --             *
Margret M. Jordan                             2,000          1,000          1,000         2,000          --             *
</TABLE>
                                      -12-
<PAGE>
<TABLE>
                                                                                                          COMMON STOCK
                                                                 SHARES OF COMMON STOCK                BENEFICIALLY OWNED
                                           SHARES OF           COVERED BY THIS PROSPECTUS             AFTER THE OFFERING(1)
                                          COMMON STOCK    -------------------------------------     --------------------------
                                       BENEFICIALLY OWNED              ISSUABLE UPON
                                           PRIOR TO                     EXERCISE OF                  NUMBER
NAME OF SELLING STOCKHOLDER              THE OFFERING(1)  OUTSTANDING     WARRANTS        TOTAL     OF SHARES     PERCENTAGE
- ---------------------------            ------------------ -----------  --------------     -----     ---------     ----------
<S>                                    <C>                <C>          <C>               <C>        <C>           <C>
Maurice and Stacy Gozlan
Tenants by the Entirety                      20,000         10,000         10,000        20,000          --             *
Deborah Christian                             5,454          2,727          2,727         5,454          --             *
Josef Paradis and Shelley Paradis            36,360         18,180         18,180        36,360          --             *
Jeffrey H. Lerer                              5,000          2,500          2,500         5,000          --             *
Alan Gainsford                               15,000          7,500          7,500        15,000          --             *
Haim Shaked and Ruth Shaked                   4,000          2,000          2,000         4,000          --             *
Richard N. Bernstein, as Trustee             20,000         10,000         10,000        20,000          --             *
Milton Susman Trustee
Milton Susman Trust
UAD-5-8-89 FOB Milton Susman                 10,000          5,000          5,000        10,000          --             *
Michael Futerman                             36,000         18,000         18,000        36,000          --             *
Sanford B. Miot                               9,090          4,545          4,545         9,090          --             *
Rush & Co.                                   37,200         18,600         18,600        37,200          --             *
Martin Greenberg                             17,526         14,021          3,505        17,526          --             *
Moty Hermon                                   3,000          1,500          1,500         3,000          --             *
Forsyth Realty, Inc. P/S                      9,090          4,545          4,545         9,090          --             *
Tioga Capital Corporation                    11,685           --           11,685(2)     11,685          --             *
Michael M. Rothkopf                          15,500          5,000         10,500        15,500          --             *
Harry Z. Rosengart                           91,500         51,220           --          51,220      40,280             *
Carmine C. Mascoli                           28,106(3)      18,696           --          18,696       9,410             *
TOTAL                                     1,527,936        854,260        623,986     1,478,246      49,690             *
</TABLE>
- -----------------------------
* Represents less than 1%
(1) The table reflects the shares of Common Stock beneficially owned by each
    Selling Stockholder and includes the number of Shares being registered
    hereunder that each Selling Shareholder would receive upon exercise of all
    warrants and options, as well as the shares of Common Stock otherwise owned
    by such Selling Stockholder. While the Selling Stockholders have not
    expressed a specific intention as to the number of Shares to be sold, the
    table shows the beneficial ownership that would result if all Shares
    issuable upon exercise of the warrants and options were sold.
(2) Shares of Common Stock that are issuable upon exercise of certain options.
(3) Includes 7010 shares of common stock in which Mr. Mascoli holds beneficial
    interest through SunPharm Investors, L.P.

   Certain shares of Common Stock owned by or issuable upon the exercise of 
warrants and options held by Tioga Capital Corporation ("Tioga") and SunPharm 
Investor, L.P. ("SunPharm Investors"), a limited partnership of which Tioga 
is the general partner, are covered by this Prospectus.  George B. 
Schwartz, a director of the Company, is the founder and President of Tioga. 
On July 19, 1996, the Company issued 159,842 shares of Common Stock and 
warrants to purchase 39,960 shares of Common Stock to SunPharm Investors in 
consideration for the exercise by SunPharm Investors of warrants to purchase 
159,842 shares of Common Stock and the payment of the $304,262 exercise price 
of such warrants. In April 1997, in connection with the amendments to the 
terms of warrants issued in the Company's 1996 private placement and exchange 
offer, the Company agreed to reduce the exercise price of the warrants issued 
in July 1996 to $3.00 per share, and extended the expiration date of such 
warrants to March 31, 2001, on the same terms offered to other holders of 
such warrants.

                                      -13-
<PAGE>

                           PLAN OF DISTRIBUTION

     The Selling Stockholders may offer the shares of Common Stock subject to 
this Prospectus from time to time for their own account in transactions on 
The Nasdaq Small Cap Market, in negotiated transactions or otherwise, at 
market prices prevailing at the time of sale, at prices related to such 
prevailing market prices or at negotiated prices. The Selling Stockholders 
may effect such transactions by selling the shares to or through broker-dealers
and such broker-dealers may receive compensation in the form of discounts, 
concessions or commissions from the Selling Stockholders or the purchasers of 
the shares for whom such broker-dealers may act as agent or to whom they sell 
as principal or both (which compensation to a particular broker-dealer might 
be in excess of customary commissions). The methods by which the shares may 
be sold include (i) a block trade (which may involve crosses) in which the 
broker or dealer so engaged will attempt to sell the securities as agent but 
may position and resell a portion of the block as principal to facilitate the 
transaction; (ii) purchases by a broker or dealer as principal and resale by 
such broker or dealer for its account pursuant to this Prospectus; (iii) 
ordinary brokerage transactions and transactions in which the broker solicits 
purchasers; and (iv) privately negotiated transactions.

     None of the proceeds from the sale of the shares of Common Stock subject 
to this Prospectus by the Selling Stockholders will be received by the 
Company. The Company has agreed to bear certain expenses in connection with 
the registration and sale of the shares being offered by the Selling 
Stockholders, and has agreed to indemnify the Selling Stockholders against 
certain liabilities under the Securities Act.  The Selling Stockholders and 
any broker-dealers participating in the distribution of the shares of Common 
Stock subject to this Prospectus may be deemed to be "underwriters" within 
the meaning of the Securities Act, and any profit on the sale of Shares by 
the Selling Stockholders and any commissions received by any such 
broker-dealers may be deemed to be underwriting commission under the 
Securities Act.

     The shares of Common Stock subject to this Prospectus have not been 
registered for sale by the Selling Stockholders under the securities laws of 
any state as of the date of this Prospectus.  Brokers or dealers effecting 
transactions in the shares should confirm registration thereof under the 
securities laws of the states in which such transactions occur, or the 
existence of any exemption from registration.

     If underwriters are used in any offering of shares of Common Stock, the 
underwriter or underwriters with respect to such offering will be named in a 
Prospectus Supplement. Only underwriters named in a Prospectus Supplement 
will be deemed to be underwriters in connection with the shares of Common 
Stock offered thereby.  Firms not so named will have no direct or indirect 
participation in the underwriting of such Common Stock, although such a firm 
may participate in the distribution of such Common Stock under circumstances 
entitling it to a dealer's commission.  Unless otherwise set forth in the 
Prospectus Supplement relating to such offering, any underwriting agreement 
pertaining to any offering of shares of Common Stock will (i) entitle the 
underwriters to indemnification by the Company and the Selling Stockholders 
against certain civil liabilities under the Securities Act; (ii) provide that 
the obligations of the underwriters will be subject to certain conditions 
precedent; and (iii) provide that the underwriters will be obligated to 
purchase all shares of such Common Stock so offered if any shares are 
purchased. If underwriters are used in any offering of Common Stock, the 
names of such underwriters, the anticipated date of delivery and other 
material terms of the transaction will be set forth in the Prospectus 
Supplement relating to such offering.

     Underwriters, brokers and dealers may engage in transactions with or 
perform services for the Company in the ordinary course of business.

     Offers to purchase Common Stock may be solicited, and sales thereof may 
be made, by the Selling Stockholders directly to one or more purchasers in 
fixed price offerings, in negotiated transactions, at market prices 
prevailing at the time of sale or at prices related to such market prices. 
Certain of such purchasers may be deemed to be underwriters with respect to 
any resale by them of Common Stock so acquired.  This Prospectus may be 
delivered by any such purchaser in connection with any such resales. Such 
resales may be through underwriters, brokers or dealers, or directly to one 
or more purchasers, all in the manner described above.

     NEW JERSEY INVESTORS:  The Securities offered by the Selling Stockholders
may be sold in New Jersey only through a registered broker-dealer or in reliance
upon an exemption from registration under the Securities Act.


                                    -14-

<PAGE>

                           DESCRIPTION OF SECURITIES

COMMON STOCK

     The Company has authorized 25,000,000 shares of Common Stock, par value 
$.0001 per share.  As of July 31, 1997, 5,667,471 shares of Common Stock were 
issued and outstanding and held by 131 holders of record.

     The holders of Common Stock are entitled to one vote for each share held 
of record on all matters to which stockholders may vote, including the 
election of directors. The holders of Common Stock are entitled to share 
ratably on a share for share basis with respect to any dividends when, as and 
if declared by the Board of Directors out of funds legally available 
therefor. In the event of a liquidation, dissolution or winding up of the 
Company, holders of the Common Stock are entitled to share ratably in all 
assets remaining after payment of liabilities and the liquidation preference 
of any then outstanding Preferred Stock.  Holders of Common Stock have no 
preemptive rights and no right to convert their Common Stock into any other 
securities. There are no redemption or sinking fund provisions applicable to 
the Common Stock. All outstanding shares of Common Stock are, and all shares 
of Common Stock included in the Units offered hereby will be, fully paid and 
nonassessable.

PREFERRED STOCK

     The Board of Directors has the authority, without further action by the 
stockholders, to issue up to 2,500,000 shares of Preferred Stock, par value 
$.001 per share, in one or more series and to fix the rights, preferences, 
privileges and restrictions thereof, including dividend rights, conversion 
rights, voting rights, terms of redemption, liquidation preferences, sinking 
fund terms and the number of shares constituting any series or the 
designation of such series.  The issuance of Preferred Stock could adversely 
affect the voting power of the holders of Common Stock and the likelihood 
that such holders will receive dividend payments and payments upon liquidation
and could have the effect of delaying, deferring or preventing a change in 
control of the Company. The Company has no present plan to issue any shares of 
Preferred Stock.

OUTSTANDING OPTIONS AND WARRANTS

     At July 31, 1997, the Company had an aggregate of 3,093,618 shares of 
Common Stock reserved for issuance pursuant to outstanding options and 
warrants and options issued and available under the Company's 1994 Stock 
Option Plan and 1995 Nonemployee Directors' Stock Option Plan. The Company 
had outstanding options and warrants to purchase an aggregate of 5,203,376 
shares of Common Stock, expiring at various period through April 2004.

TRANSFER AGENT AND REGISTRAR

     Continental Stock Transfer & Trust Company in New York, New York, is the
transfer agent for the Common Stock.

REGISTRATION RIGHTS

     Pursuant to agreements between the Company and the holders of 634,100 
outstanding shares of Common Stock and of warrants exercisable for an 
additional 524,618 shares of Common Stock, such holders have the right to 
require the Company to register the sale of such shares of Common Stock (the 
"Registrable Securities") under the Securities Act under certain 
circumstances. See "Risk Factors--Shares Eligible for Future Sale."  Subject 
to certain exceptions, the holders of 50% of the Registrable Securities may 
require the Company to register the Registrable Securities held by them for 
public resale at the Company's expense, less underwriters commissions. This 
right may be exercised twice, so long as at least 90% of the Registrable 
Securities requested to be registered were in fact registered and sold. In 
addition, if at any time following this offering the Company proposes to 
register any of its securities under the Securities Act, holders of 
Registrable Securities and holders of an additional 1,698,171 shares of 
Common Stock (including 712,736 shares which may be acquired upon exercise of 
outstanding options and warrants) are entitled, subject to certain restrictions,
to include their Registrable Securities in such registration.  The Company is
required to bear all registration and selling


                                    -15-

<PAGE>

expenses other than underwriters' commissions in connection with the 
registration of Registrable Securities for the two required registrations and 
for all Company-initiated registrations.

DELAWARE BUSINESS COMBINATION STATUTE

     The Company is subject to the provisions of Section 203 of the Delaware 
General Corporation Law, an anti-takeover law.  In general, the statute 
prohibits a publicly held Delaware corporation from engaging in a "business 
combination" with an "interested stockholder" for a period of three years 
after the date of the transaction in which the person became an interested 
stockholder, unless the business combination is approved in a prescribed 
manner. For purposes of Section 203, a "business combination" includes a 
merger, asset sale or other transaction resulting in a financial benefit to 
the interested stockholder, and an "interested stockholder" is a person who, 
together with affiliates and associates, owns (or within three years prior, 
did own) 15% or more of the corporation s voting stock.                  


                                    LEGAL MATTERS

     Certain legal matters with respect to the validity of the securities 
offered hereby have been passed upon for the Company by Andrews & Kurth 
L.L.P., Houston, Texas.

                                     EXPERTS

     The financial statements incorporated in this prospectus by reference 
from the Company's Annual Report on Form 10-KSB for the year ended December 31,
1996 have been audited by Deloitte & Touche LLP, independent auditors, as 
stated in their report, which is incorporated herein by reference (which 
report expresses an unqualified opinion and includes an explanatory paragraph 
referring to recurring losses incurred by the Company from inception and to 
an uncertainty surrounding the Company's ability to obtain sufficient 
financing in 1997 which raises substantial doubt about the Company's ability 
to continue as a going concern), and have been so incorporated in reliance 
upon the report of such firm given upon their authority as experts in 
accounting and auditing.








                                    -16-

<PAGE>

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

     NO DEALER, SALESPERSON OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO GIVE 
ANY INFORMATION OR TO MAKE ANY REPRESENTATIONS IN CONNECTION WITH THIS 
OFFERING OTHER THAN THOSE CONTAINED IN OR INCORPORATED BY REFERENCE IN THIS 
PROSPECTUS AND, IF GIVEN OR MADE, SUCH INFORMATION OR REPRESENTATION MUST NOT 
BE RELIED UPON AS HAVING BEEN AUTHORIZED BY THE COMPANY.  THIS PROSPECTUS 
DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO BUY ANY 
OF THESE SECURITIES IN ANY JURISDICTION TO ANY PERSON TO WHOM IT IS UNLAWFUL 
TO MAKE SUCH OFFER OR SOLICITATION IN SUCH JURISDICTION.  NEITHER THE DELIVER 
OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER SHALL AT ANY TIME IMPLY THAT 
THE INFORMATION CONTAINED OR INCORPORATED BY REFERENCE HEREIN IS CORRECT AS 
OF ANY TIME SUBSEQUENT TO THE DATE HEREOF.

                                TABLE OF CONTENTS

                                                                          Page
                                                                          ----
Available Information . . . . . . . . . . . . . . . . . . . . . . . . . .   2
Incorporation of Certain Documents 
  by Reference. . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   2
The Company . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   4
Risk Factors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .   5
Use of Proceeds . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  10
Selling Stockholders. . . . . . . . . . . . . . . . . . . . . . . . . . .  11
Plan of Distribution. . . . . . . . . . . . . . . . . . . . . . . . . . .  14
Description of Securities . . . . . . . . . . . . . . . . . . . . . . . .  15
Legal Matters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16
Experts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  16

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


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





                               SUNPHARM CORPORATION



                        1,478,246 SHARES OF COMMON STOCK





                                    ------------
                                     PROSPECTUS
                                    ------------






                                           , 1997

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

<PAGE>

                                  PART II

                    INFORMATION NOT REQUIRED IN PROSPECTUS

ITEM 14.  OTHER EXPENSES OF ISSUANCE AND DISTRIBUTION

     The following table sets forth all expenses, other than underwriting 
discounts and commissions, payable by the Registrant in connection with the 
sale of the Common Stock being registered. All the amounts shown are 
estimates except for the registration fee.

SEC registration fee . . . . . . . . . . . . . . . . . . . . . . . . $  1,635
Blue Sky fees and expenses . . . . . . . . . . . . . . . . . . . . .       --
Legal fees and expenses. . . . . . . . . . . . . . . . . . . . . . .   15,000
Accounting fees and expenses . . . . . . . . . . . . . . . . . . . .    5,000
Miscellaneous fees and expenses. . . . . . . . . . . . . . . . . . .    3,365
                                                                     --------
      TOTAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . $ 25,000
                                                                     --------
                                                                     --------


ITEM 15.  INDEMNIFICATION OF OFFICERS AND DIRECTORS

     Reference is made to Article VII of the By-Laws of the Company (filed as 
Exhibit 3.2) to the Company's Annual Report on Form 10-KSB for the fiscal 
ended December 31, 1996 and to Section 145 of the Delaware General 
Corporation Law, which, among other things and subject to certain conditions, 
authorize the Company to indemnify each of its officers and directors against 
certain liabilities and expenses incurred by such persons in connection with 
claims made by reason of their being such officers or directors. Reference is 
further made to the Company's 1995 underwriting agreement (filed as Exhibit 
1.1) to the Registration Statement on Form SB-2 (No. 33-85416-A) as filed on 
January 10, 1995, which contains provisions for the indemnification of 
directors, officers and controlling persons of the Company under certain 
circumstances.

ITEM 16.  EXHIBITS

   Exhibit No.   Description
   -----------   -----------

       *5.1      Opinion of Andrews & Kurth L.L.P.

      *23.1      Consent of Deloitte & Touche LLP

      *23.2      Consent of Andrews & Kurth L.L.P. (included in opinion
                 filed as Exhibit 5.1).

      *24.1      Power of Attorney (included on signature page).

- ----------------
      * Filed Herewith

ITEM 17.  UNDERTAKINGS

          The undersigned Registrant hereby undertakes:

          (a)  To file, during any period in which offers or sales are being
     made, a post-effective amendment to this Registration Statement;

               (i) To include any prospectus required by Section 10(a)(3) of
          the Securities Act of 1933, as amended (the "Securities Act");


                                    II-1

<PAGE>

               (ii)  To reflect in the prospectus any facts or events arising
          after the effective date of the Registration Statement (or the most
          recent post-effective amendment thereof) which, individually or in the
          aggregate, represent a fundamental change in the information set forth
          in the Registration Statement;

               (iii) To include any material information with respect to the
          plan of distribution not previously disclosed in this Registration
          Statement or any material change to such information in the
          Registration Statement.

          Provided, however, that paragraphs (a)(i) and (a)(ii) do not apply if
     the information required to be included in a post-effective amendment by
     those paragraphs is contained in periodic reports filed by the Registrant
     pursuant to Section 13 or Section 15(d) of the Securities and Exchange Act
     of 1934, as amended (the "Exchange Act") that are incorporated by reference
     in the Registration Statement.

          (b)  That, for the purpose of determining any liability under the
     Securities Act, each such post-effective amendment shall be deemed to be a
     new registration statement relating to the securities offered therein, and
     the offering of such securities at that time shall be deemed to be the
     initial bona fide offering thereof.

          (c)  To remove from registration by means of a post-effective
     amendment any of the securities being registered which remain unsold at the
     termination of the offering.

          The undersigned Registrant hereby undertakes that, for purposes of
     determining any liability under the Securities Act, each filing of the
     Registrant's annual report pursuant to section 13(a) or section 15(d) of
     the Exchange Act (and, where applicable, each filing of an employee benefit
     plan's annual report pursuant to section 15(d) of the Exchange Act) that is
     incorporated by reference in the Registration Statement shall be deemed to
     be a new registration statement relating to the securities offered therein,
     and the offering of such securities at that time shall be deemed to be the
     initial bona fide offering thereof.

          Insofar as indemnification for liabilities arising under the 
     Securities Act may be permitted to directors, officers and controlling
     persons of the Registrant pursuant to the foregoing provisions, or
     otherwise, the Registrant has been advised that in the opinion of the
     Securities and Exchange Commission such indemnification is against public
     policy as expressed in the Securities Act, and is, therefore, 
     unenforceable. In the event that a claim for indemnification against such
     liabilities (other than the payment by the Registrant of expenses incurred
     or paid by a director, officer or controlling person of the Registrant in
     the successful defense of any action, suit or proceeding) is asserted by
     such director, officer or controlling person in connection with the
     securities being registered, the Registrant will, unless in the opinion of
     its counsel the matter has been settled by controlling precedent, submit a
     court of appropriate jurisdiction the question whether such indemnification
     by it is against public policy as expressed in the Securities Act and will
     be governed by the final adjudication of such issue.


                                    II-2

<PAGE>

                                  SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, the 
Registrant certifies that it has reasonable grounds to believe that it meets 
all of the requirements for filing on Form S-3 and has duly caused this 
Registration Statement to be signed on its behalf by the undersigned, 
thereunto duly authorized, in the City of Jacksonville, State of Florida on 
August 7, 1997.

                                       SUNPHARM CORPORATION


DATE: AUGUST 7, 1997                   By: /s/ STEFAN BORG
                                          -----------------------------------
                                          Stefan Borg
                                          President and Chief Executive Officer

     KNOW ALL PERSONS BY THESE PRESENTS, that each person whose signature 
appears below constitutes and appoints Stefan Borg his true and lawful 
attorney-in-fact and agent, with full power of substitution and 
resubstitution for him and in his name, place, and stead, in any and all 
capacities, to sign any and all amendments (including post-effective 
amendments) to this Registration Statement, and to file the same, with all 
exhibits thereto, and other documents in connection therewith, with the 
Securities and Exchange Commission, granting unto said attorney-in-fact and 
agent full power and authority to do and perform each and every act and thing 
requisite and necessary to be done in connection therewith, as fully to all 
intents and purposes as he might or could do in person, hereby ratifying and 
confirming all that said attorney-in-fact and agent, or his substitute, may 
lawfully do or cause to be done by virtue hereof.

     PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THIS 
REGISTRATION STATEMENT HAS BEEN SIGNED BY THE FOLLOWING PERSONS IN THE 
CAPACITIES AND ON THE DATES INDICATED.

         SIGNATURE                           TITLE                     DATE
         ---------                           -----                     ----

  /s/ Stefan Borg              President, Director and Chief      August 7, 1997
- -----------------------------  Executive Officer (PRINCIPAL
     (Stefan Borg)             EXECUTIVE AND ACCOUNTING OFFICER)

  /s/  Philip R. Tracy         Chairman of the Board              August 7, 1997
- -----------------------------  of Directors
      (Philip R. Tracy)

  /s/ Charles Dimmler, III     Director                           August 7, 1997
- -----------------------------
     (Charles Dimmler, III)

  /s/ Jerry T. Jackson         Director                           August 7, 1997
- -----------------------------
     (Jerry T. Jackson)

  /s/ Robert S. Janicki        Director                           August 7, 1997
- -----------------------------
     (Robert S. Janicki)

  /s/ Norman H. Lipoff         Director                           August 7, 1997
- -----------------------------
     (Norman H. Lipoff)

  /s/ Robert A. Schoellhorn    Director                           August 7, 1997
- -----------------------------
     (Robert A.  Schoellhorn)

  /s/ George B. Schwartz       Director                           August 7, 1997
- -----------------------------
     (George B. Schwartz)



                                     II-3

<PAGE>

                                INDEX TO EXHIBITS

  EXHIBIT NO.    DESCRIPTION
  -----------    -----------

     *5.1        Opinion of Andrews & Kurth L.L.P.

    *23.1        Consent of Deloitte & Touche LLP

    *23.2        Consent of Andrews & Kurth L.L.P. (included in opinion filed
                 as Exhibit 5.1).

    *24.1        Power of Attorney (included on signature page).

- --------------------
*  Filed herewith.


<PAGE>
                                                                    Exhibit 5.1


                                   Form of Opinion




                                    August 7, 1997


Board of Directors
SunPharm Corporation
4651 Salisbury Road, Suite 205
Jacksonville, Florida 32256

Gentlemen:

         We have acted as counsel to SunPharm Corporation (the "Company") in 
connection with the Company's Registration Statement on Form S-3 (the 
"Registration Statement") relating to the registration under the Securities 
Act of 1993, as amended (the "Securities Act"), of the offer and sale by the 
Selling Stockholders identified in the Registration Statement of up to 
1,478,246 shares of the Common Stock, par value $.001 per share ("Common 
Stock"), of the Company, of which (i) 854,260 shares of Common Stock are 
issued and outstanding as of the date of this Prospectus (the "Outstanding 
Shares"), (ii) 612,301 shares of Common Stock are issuable upon the exercise 
of certain outstanding warrants (the "Warrant Shares"), and (iii) 11,685 
shares of Common Stock are issuable upon the exercise of certain outstanding 
options (the "Option Shares"). 

         As the basis for the opinions hereinafter expressed, we have 
examined such statutes, regulations, corporate records and documents, 
certificates of corporate and public officials, and other instruments as we 
have deemed necessary or advisable.  In such examination we have assumed the 
authenticity of all documents submitted to us as originals and the conformity 
with the original documents of all documents submitted to us as copies.

         Based on the foregoing and on such legal considerations as we deem 
relevant, we are of the opinion that:

         1.   The Outstanding Shares have been duly and validly authorized, and
    are validly issued, fully paid and nonassessable.

         2.   The Warrant Shares have been duly and validly authorized, and
    when issued upon the exercise of such warrants in accordance with the terms
    thereof, will be validly issued, fully paid and nonassessable.

         3.   The Option Shares have been duly and validly authorized, and when
    issued upon the exercise of such options in accordance with the terms
    thereof, will be validly issued, fully paid and nonassessable.

         We hereby consent to the use of this opinion as an exhibit to the 
Registration Statement and reference to our firm under the caption "Legal 
Matters" in the Prospectus included therein.

                                      Very truly yours,



<PAGE>


                                                                    Exhibit 23.1


                            INDEPENDENT AUDITORS' CONSENT

    We consent to the incorporation by reference in this Registration Statement
of SunPharm Corporation (the "Company") on Form S-3 of our report dated March
14, 1997 (which report expresses an unqualified opinion and includes an
explanatory paragraph referring to recurring losses incurred by the Company from
inception and to an uncertainty surrounding the Company's ability to obtain
sufficient financing in 1997 which raises substantial doubt about the Company's
ability to continue as a going concern), appearing in the Annual Report on Form
10-KSB of SunPharm Corporation for the year ended December 31, 1996, and to the
reference to us under the heading "Experts" in the Prospectus, which is a part
of this Registration Statement.



DELOITTE & TOUCHE LLP
Jacksonville, Florida

August 7, 1997



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