Document:

Exhibit 10.12

THESE SECURITIES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS
AMENDED (THE "SECURITIES ACT"), AND THEY MAY NOT BE OFFERED, SOLD, PLEDGED,
HYPOTHECATED, ASSIGNED OR TRANSFERRED EXCEPT (i) PURSUANT TO A REGISTRATION
STATEMENT UNDER THE SECURITIES ACT WHICH HAS BECOME EFFECTIVE AND IS CURRENT
WITH RESPECT TO THESE SECURITIES, OR (ii) PURSUANT TO A SPECIFIC EXEMPTION FROM
REGISTRATION UNDER THE SECURITIES ACT, BUT ONLY UPON A HOLDER HEREOF FIRST
HAVING OBTAINED THE WRITTEN OPINION OF COUNSEL TO THE ISSUER, OR OTHER COUNSEL
REASONABLY ACCEPTABLE TO THE ISSUER, THAT THE PROPOSED DISPOSITION IS EXEMPT
FROM REGISTRATION UNDER THE SECURITIES ACT.

                               4net Software, Inc.

                          COMMON STOCK PURCHASE WARRANT

                         DATED, as of September 30, 2001

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

Holder:    Catalyst Financ1al LLC                             Warrant No:
                                                                         ------
Number of Warrants:  82,000

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

         THIS CERTIFIES THAT Holder is the owner of the number of Warrants set
forth above of 4net Software, Inc., a Delaware corporation (hereinafter called
the "Company"). Each Warrant entitles the registered holder (the "Holder") to
purchase one share (collectively, "Warrant Shares") of Common Stock of the
Company ("Common Stock") at an exercise price per share of $0.50 (the "Exercise
Price"), at any time during the period commencing on September 30, 2001, until
September 29, 2006 (the "Expiration Date").

         The Exercise Price and number of shares of Common Stock of the Company
purchasable upon exercise of each Warrant evidenced hereby shall be subject to
adjustment from time to time as set forth below.

         The number and kind of shares purchasable upon the exercise of Warrants
and the Exercise Price shall be subject to adjustment from time to time as
follows:

<PAGE>

         (a) Stock Splits, Combinations, etc. In case the Company shall
hereafter (i) pay a dividend or make a distribution on its Common Stock in
shares of its capital stock (whether shares of Common Stock or of capital stock
of any other class), (ii) subdivide its outstanding shares of Common Stock,
(iii) combine its outstanding shares of Common Stock into a smaller number of
shares, or (iv) issue by reclassification of its shares of Common Stock any
shares of capital stock of the Company, the Exercise Price and number of shares
of Common Stock underlying the Warrant (if applicable) in effect immediately
prior to such action shall be adjusted so that the Holder of any Warrant
thereafter exercised shall be entitled to receive the number of shares of
capital stock of the Company which such Holder would have owned immediately
following such action had such Warrant been exercised immediately prior thereto.
An adjustment made pursuant to this paragraph shall become effective immediately
after the record date in the case of a dividend and shall become effective
immediately after the effective date in the case of a subdivision, combination
or reclassification. If, as a result of an adjustment made pursuant to this
paragraph, the Holder of any Warrant thereafter exercised shall become entitled
to receive shares of two or more classes of capital stock of the Company, the
Board of Directors (whose determination shall be conclusive) shall determine the
allocation of the adjusted Exercise Price between or among shares of such
classes of capital stock.

         (b) Reclassification, Combinations, Mergers, etc. In case of any
reclassification or change of outstanding shares of Common Stock issuable upon
exercise of the Warrants (other than as set forth in paragraph (a) above and
other than a change in par value, or from par value to no par value, or from no
par value to par value or as a result of a subdivision or combination), or in
case of any consolidation or merger of the Company with or into another
corporation (other than a merger in which the Company is the continuing
corporation and which does not result in any reclassification or change of the
then outstanding shares of Common Stock or other capital stock issuable upon
exercise of the Warrants (other than a change in par value, or from par value to
no par value, or from no par value to par value or as a result of a subdivision
or combination)) or in case of any sale or conveyance to another corporation of
the property of the Company as an entirety or substantially as an entirety,
then, as a condition of such reclassification, change, consolidation, merger,
sale or conveyance, the Company or such a successor or purchasing corporation,
as the case may be, shall forthwith make lawful and adequate provision whereby
the holder of such Warrant then outstanding shall have the right thereafter to
receive on exercise of such Warrant the kind and amount of shares of stock and
other securities and property receivable upon such reclassification, change,
consolidation, merger, sale or conveyance by a holder of the number of shares of
Common Stock issuable upon exercise of such Warrant immediately prior to such
reclassification, change, consolidation, merger, sale or conveyance. Such
provisions shall include provision for adjustments which shall be as nearly
equivalent as may be practicable to the adjustments provided for herein. The
above provisions of this paragraph (b) shall similarly apply to successive
reclassifications and changes of shares of Common Stock and to successive
consolidations, mergers, sales or conveyances. This provision shall not limit
the rights of the Holders as specified in this Warrant Certificate to exercise
the Warrants prior to any of the events described herein.

         (c) Other Adjustments. In the event that at any time, as a result of an
adjustment, the Holders shall become entitled to receive any securities of the
Company other than shares of Common Stock, thereafter the number of such other
securities so receivable upon exercise of the Warrants and the Exercise Price
applicable to such exercise shall be subject to adjustment from time to time in
a manner and on terms as nearly equivalent as practicable to the provisions with
respect to the shares of Common Stock contained herein.

<PAGE>

         Whenever the number of shares of Common Stock or other stock or
property issuable upon the exercise of each Warrant or the Exercise Price is
adjusted, as herein provided, the Company shall promptly mail by first class
mail, postage prepaid, to each Holder notice of such adjustment or adjustments
and shall obtain a certificate of a firm of independent public accountants
selected by the Board of Directors of the Company (who may be the regular
accountants employed by the Company) setting forth the number of shares of
Common Stock or other stock or property issuable upon the exercise of each
Warrant or the Exercise Price after such adjustment, setting forth a brief
statement of the facts requiring such adjustment and setting forth the
computation by which such adjustment was made. The Company shall be entitled to
rely on such certificate and shall be under no duty or responsibility with
respect to any such certificate, except to exhibit the same from time to time to
any Holder desiring an inspection thereof during reasonable business hours.

         Irrespective of any adjustment in the number or kind of shares issuable
upon the exercise of the Warrants or the Exercise Price, Warrants theretofore or
thereafter issued may continue to express the same number and kind of shares as
are stated in the Warrants initially issuable pursuant to this Agreement.

         The Company shall not be required to issue fractional shares of Common
Stock on the exercise of Warrants. If more than one Warrant shall be presented
for exercise in full at the same time by the same Holder, the number of full
shares of Common Stock which shall be issuable upon such exercise shall be
computed on the basis of the aggregate number of shares of Common Stock
acquirable on exercise of the Warrants so presented. If any fraction of a share
of Common Stock would, except for the provisions of this Section, be issuable on
the exercise of any Warrant (or specified portion thereof), the Company shall
pay an amount in cash calculated by it to equal the then current market value
per share multiplied by such fraction computed to the nearest whole cent. The
Holders, by their acceptance of the Warrant Certificates, expressly waive any
and all rights to receive any fraction of a share of Common Stock or a stock
certificate representing a fraction of a share of Common Stock.

         The Warrants evidenced hereby may be exercised in whole or in part by
presentation of this Warrant Certificate with the Purchase Form attached hereto
duly executed (with a signature guarantee as provided hereon) and simultaneous
payment of the Exercise Price at the principal office of the Company. Payment of
such price shall be made in cash, by certified or official bank check or any
combination thereof.

         Upon any partial exercise of the Warrants evidenced hereby, there shall
be signed and issued to the Holder a new Warrant Certificate in respect of the
Warrant Shares as to which the Warrants evidenced hereby shall not have been
exercised. These Warrants may be exchanged at the office of the Company by
surrender of this Warrant Certificate properly endorsed for one or more new
Warrants of the same aggregate number of Warrant Shares as evidenced by the
Warrant or Warrants exchanged. No fractional securities shall be issued upon the
exercise of rights to purchase hereunder, but the Company shall pay the cash
value of any fraction upon the exercise of one or more Warrants. These Warrants
are transferable at the office of the Company in the manner and subject to the
limitations set forth herein.

         This Warrant Certificate does not entitle any Holder to any of the
rights of a stockholder of the Company, including without limitation the right
to vote and/or receive dividends.

                                             4net Software, Inc.

                                         By:
                                             --------------------------------
                                             Name:
                                             Title:

Dated as of September 30, 2002

ATTEST:

-----------------------------
Name:
Title:

<PAGE>

                               4net Software, Inc.
                          COMMON STOCK PURCHASE WARRANT
                                  PURCHASE FORM

4net Software, Inc. (the "Company")
10 South Street, Suite 202
Ridgefield, Connecticut 06877
Attention: Steven N. Bronson, President

           The undersigned hereby irrevocably elects to exercise the right of
purchase represented by the within Warrant Certificate for, and to purchase
thereunder, _________ shares of common stock of 4net Software, Inc. (the
"Company") (the "Warrant Shares") provided for therein, and requests that
certificates for the Warrant Stock be issued in the name of:

                   ------------------------------------------
         (Please print or Type Name, Address and Social Security Number)

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

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

and, if said number of Warrant Shares shall not be all the Warrant Shares
purchasable hereunder, that a new Warrant Certificate for the balance of the
Warrant Shares purchasable under the within Warrant Certificate be registered in
the name of the undersigned Holder or his assignee as below indicated and
delivered to the address stated below.

Dated:                               Name of Holder
      ------------------             or Assignee:
                                                  ----------------------------
                                                         (Please Print)
                                     Address:
                                              --------------------------------

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

                                     Signature:
                                                ------------------------------

Note: The above signature must correspond with the name as it appears upon the
face of this Warrant Certificate in every particular, without alteration or
enlargement or any change whatever, unless these Warrants have been assigned.

Signature Guaranteed:
                     -----------------------------

(Signature must be guaranteed by a bank, trust company or savings and loan
association, having an office or correspondent in the United States or by a
member firm of a registered securities exchange or the National Association of
Securities Dealers, Inc.)

<PAGE>

                               4net Software, Inc.
                          COMMON STOCK PURCHASE WARRANT

                                   ASSIGNMENT
                 (To be signed only upon assignment of Warrants)

         FOR VALUE RECEIVED, the undersigned hereby sells, assigns and transfers
the right to purchase ______________ Warrant Shares represented by the within
Warrant Certificate unto, and requests that a certificate for such Warrant be
issued in the name of:

                      -------------------------------------
          (Name and Address of Assignee Must be Printed or Typewritten)

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

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

hereby irrevocably constituting and appointing _______________ as attorney to
transfer said Warrants on the books of the Company, with full power of
substitution in the premises and, if said number of shares of Warrant Stock
shall not be all of the Warrant Stock purchasable under the within Warrant
Certificate, that a new Warrant Certificate for the balance of the Warrant Stock
purchasable under the within Warrant Certificate be registered in the name of
the undersigned Holder and delivered to such Holder's address as then set forth
on the Company's books.

Dated:                                           ------------------------------
      ---------------                            Signature of Registered Holder

Note: The above signature must correspond with the name as it appears upon the
face of this Warrant Certificate in every particular, without alteration or
enlargement or any change whatever.

Signature Guaranteed:
                     -----------------------------

(Signature must be guaranteed by a bank, trust company or savings and loan
association having an office or correspondent in the United States or by a
member firm of a registered securities exchange or the National Association of
Securities Dealers, Inc.)<PAGE>
                                                                     Exhibit 4.1

                  AMENDMENT TO THE CERTIFICATE OF DESIGNATIONS,
                             PREFERENCES, AND RIGHTS

                                       of

                            SERIES A PREFERRED STOCK,
                          SERIES B PREFERRED STOCK, AND
                            SERIES C PREFERRED STOCK

                                       of

                               GLYCOGENESYS, INC.

               We, Bradley J. Carver and John W. Burns, the President and the
Secretary, respectively, of GlycoGenesys, Inc., a corporation organized and
existing under the laws of the State of Nevada (the "Corporation"), in
                                                     -----------
accordance with the provisions of Section 78.1955 of the Nevada Revised
Statutes, DO HEREBY CERTIFY:

               WHEREAS, on June 22, 2001, the Board of Directors of the
Corporation (the "Board of Directors") adopted a resolution creating three
                  ------------------
series of shares of preferred stock designated as the "Series A Preferred
Stock," the "Series B Preferred Stock," and the "Series C Preferred Stock"; and

               WHEREAS, the Board of Directors and the holders of the
Corporation's Series A preferred stock, par value U.S. $0.01 per share ("Series
                                                                         ------
A Preferred Stock"), Series B preferred stock, par value U.S. $0.01 per share
-----------------
("Series B Preferred Stock") and Series C preferred stock, par value U.S. $0.0
  ------------------------
per share ("Series C Preferred Stock") desire to amend certain powers,
            ------------------------
preferences and other special rights of the Series A Preferred Stock, Series B
Preferred Stock and Series C Preferred Stock.

               NOW, THEREFORE, pursuant to the authority conferred upon the
Board of Directors by the Articles of Incorporation of the Corporation and by
Section 78.1955 of the Nevada Revised Statutes, on April 15, 2002, the Board of
Directors adopted, and holders of a majority of the Corporation's Series A
Preferred Stock, Series B Preferred Stock and Series C Preferred Stock approved,
the following resolution, amending and restating the Certificate of
Designations, Preferences, and Rights of Series A Preferred Stock, Series B
Preferred Stock and Series C Preferred Stock of the Corporation:

          "RESOLVED, that pursuant to the authority vested in the Board of
          Directors (the "Board of Directors") of GlycoGenesys, Inc., a
                          ------------------
          corporation organized and existing under the laws of the State of
          Nevada (the "Corporation"), by the Certificate of Incorporation of the
                       -----------
          Corporation (the "Certificate of Incorporation"), the Board of
                            ----------------------------
          Directors does hereby amend and restate, effective as of July 9, 2001,
          the designations, powers, preferences, and relative participating,
          optional, or other special rights, and the qualifications,
          limitations, and restrictions of the

<PAGE>

       Corporation's Series A Preferred Stock, Series B Preferred Stock and
       Series C Preferred Stock, as follows (respectively, the "Series A
                                                                --------
       Designation", the "Series B Designation", and the "Series C
       -----------        --------------------            --------
       Designation"):
       -----------

       1.   Section 3(a) of Article I of the Certificate of Designations shall
be amended and restated in its entirety to read as follows:

       "(a) Liquidation Events. The occurrence of any of the following events
            ------------------
       shall be deemed a "Liquidation": (i) any liquidation, dissolution, or
                          -----------
       winding-up of the affairs of the Corporation; (ii) any consolidation or
       merger of the Corporation with or into any other corporation or other
       entity or person, or any other corporate reorganization, in which the
       stockholders of the Corporation immediately prior to such consolidation,
       merger or reorganization, own less than 50% of the outstanding voting
       securities of the surviving or resulting entity immediately after such
       consolidation, merger or reorganization (a "Merger Event"); (iii) any
                                                   ------------
       transaction or series of related transactions approved by the Board of
       Directors of the Corporation in which securities of the Corporation
       representing 50% or more of the combined voting power of the
       Corporation's then outstanding voting securities are acquired by a
       person, entity or group of related persons or entities, excluding any
       consolidation or merger effected exclusively to change the domicile of
       the Corporation; or (iv) any sale, lease, exclusive license or other
       disposition of all or substantially all of the assets of the
       Corporation."

       2.   Section 3(b)(iii) of Article I of the Certificate of Designations
shall be amended and restated in its entirety to read as follows:

       "(iii) After the distributions described in clause (b)(i) above have been
       paid, subject to the rights of any other class or series of capital stock
       of the Corporation that may from time to time come into existence, in the
       event of a Liquidation described in clause (i) or clause (iv) of Section
       3(a) of this Article I, the remaining assets of the Corporation available
       for distribution to stockholders shall be distributed among the holders
       of Common Stock, the holders of the Series A Preferred Stock, and the
       holders of any other class or series of capital stock of the Corporation
       entitled to share in such distribution pro rata based on the number of
       shares of Common Stock held by each, assuming conversion of any other
       class or series of capital stock of the Corporation convertible into
       shares of Common Stock."

       3.   Section 6(a) of Article I of the Certificate of Designations shall
be amended and restated in its entirety to read as follows:

       "(a) On July 10, 2007, if any shares of the Series A Preferred Stock
       shall be outstanding, the Corporation shall redeem all outstanding shares
       of the Series A Preferred Stock, at a redemption price per share equal to
       the aggregate Series A Liquidation Preference, either (i) to the extent
       the Corporation shall have funds legally available for such payment, in
       cash, or (ii) by the issuance of shares of Common Stock with an

                                       2

<PAGE>

       aggregate Fair Market Value (as defined below) equal to such redemption
       price, in each case, together with any accrued and unpaid dividends
       thereon to the date fixed for redemption. For the purposes of this
       Section 6, and Section 4(e)(i) of this Article I and Sections 4(e)(i) of
       Article II, the "Fair Market Value" of one share of Common Stock shall be
                        -----------------
       determined by the Board of Directors in good faith and certified in a
       board resolution (taking into account the most recently or concurrently
       completed arm's length transaction between the Corporation and an
       unaffiliated third party the closing of which occurs within the six
       months preceding or on the date of such calculation, if any) and shall be
       reasonably agreed to by a majority of the holders of the Series A
       Preferred Stock or, as applicable, the Series B Preferred Stock;
       provided, that in the event the Corporation and a majority of holders of
       --------
       the Series A Preferred Stock or, as applicable, the Series B Preferred
       Stock do not agree on the Fair Market Value, the parties shall jointly
       appoint an independent third party appraiser to determine the Fair Market
       Value pursuant to the procedure set forth in Section 3(d) of this Article
       I; provided further, that in the event the Common Stock is traded on a
          ----------------
       securities exchange, the Nasdaq National Market or the Nasdaq SmallCap
       Market, the Fair Market Value shall be deemed to be the average of the
       closing sale prices for the Common Stock over the 30-day trading period
       (or such shorter period for which closing sale prices are available if
       the Common Stock commenced trading during such period) ending three (3)
       trading days prior to, in the case of this Section 6, the date of notice
       of exercise of redemption pursuant to this Section 6, in the case of
       Section 4(e)(i) of this Article I or, as applicable, Section 4(e)(i) of
       Article II, the date of the sale of Additional Shares that results in an
       adjustment to the Series A Conversion Price pursuant to Section 4(e)(i)
       of this Article I or, as applicable, the Series B Conversion Price (as
       defined in Article II) pursuant to Section 4(e)(i) of Article II;
       provided further, that for the purpose of this Section 6 the Fair Market
       ----------------
       Value shall be deemed to be at least $0.50 per share (the "Share Floor
                                                                  -----------
       Price"). The Share Floor Price shall be proportionately adjusted for any
       -----
       stock split, stock combination or similar event affecting the Common
       Stock."

       4.     Section 3(a)(iii) of Article II of the Certificate of Designations
shall be amended and restated in its entirety to read as follows:

       "(iii) After the distributions described in clause (a)(i) above have been
       paid, subject to the rights of any other class or series of capital stock
       of the Corporation that may from time to time come into existence, in the
       event of a Liquidation described in clause (i) or clause (iv) of Section
       3(a) of Article I, the remaining assets of the Corporation available for
       distribution to stockholders shall be distributed among the holders of
       Common Stock, the holders of the Series B Preferred Stock, and the
       holders of any other class or series of capital stock of the Corporation
       entitled to share in such distribution pro rata based on the number of
       shares of Common Stock held by each, assuming conversion of any other
       class or series of capital stock of the Corporation convertible into
       shares of Common Stock."

                                       3

<PAGE>

       5.   Section 3 of Article III of the Certificate of Designations shall be
amended and restated in its entirety to read as follows:

       "3.  In the event of a Liquidation described in clause (i) or clause (iv)
       of Section 3(a) of Article I, whether voluntary or involuntary, the
       holders of Series C Preferred Stock shall have the right to receive, pari
       passu with the holders of the Common Stock and subject to the rights of
       the holders of any other senior class or series of capital stock of the
       Corporation, the assets of the Corporation in proportion to the number of
       shares of Common Stock held by each such holder (assuming, for such
       purposes, the holders of Series C Preferred Stock are deemed to hold that
       number of shares of Common Stock equal to the number of shares of Common
       Stock into which such shares of Series C Preferred Stock are then
       convertible)."

                            (signature page follows)

                                       4

<PAGE>

           IN WITNESS WHEREOF, said GlycoGenesys, Inc. has caused this Amendment
to the Certificate of Designations, Preferences and Rights of Series A Preferred
Stock, Series B Preferred Stock and Series C Preferred Stock to be signed by
Bradley J. Carver, its President, and John W. Burns, its Secretary, this 26/th/
day of April, 2002.

                                             GLYCOGENESYS, INC.

                                             By: /s/ Bradley J. Carver
                                                 ---------------------
                                                 Name:  Bradley J. Carver
                                                 Title: President

                                             By: /s/ John W. Burns
                                                 -----------------
                                                 Name:  John W. Burns
                                                 Title: Secretary

State of Massachusetts
         -------------

County of Suffolk
          -------

     I, Richard Gallant, a notary public, do hereby certify and attest that the
attached document is a true and exact copy of the Amended and Restated
Certificate of Designations, Preferences, and Rights of Series A Preferred
Stock, Series B Preferred Stock, and Series C Preferred Stock of the Company and
that on this 16/th/ day of April, 2002, personally appeared before me, Bradley
J. Carver and John W. Burns, who being by me first duly sworn, declared that
they are the President and Secretary of the Company, respectively, that they
signed the foregoing document as President and Secretary of the Company, and
that the statements therein contained are true.

                                             /s/ Richard Gallant
                                             -------------------
                                             Notary Public

                                                                 (Notarial Seal)

My commission expires November 21, 2008
                      -----------------

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