BAXTER INTERNATIONAL INC
SC 13D/A, 2000-01-11
SURGICAL & MEDICAL INSTRUMENTS & APPARATUS
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                      SECURITIES AND EXCHANGE COMMISSION
                            WASHINGTON, D.C. 20549

                                 SCHEDULE 13D

                   Under the Securities Exchange Act of 1934
                              (Amendment No. 4) *

                           NEXELL THERAPEUTICS INC.
                (Formerly Known as VIMRx Pharmaceuticals Inc.)
- --------------------------------------------------------------------------------
                               (Name of Issuer)
                  COMMON SHARES, $0.001 PAR VALUE PER SHARE
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   65332H104
                      (Previous CUSIP Number: 927186106)
                      ----------------------------------
                                (CUSIP Number)

                                Jan Stern Reed
                           BAXTER INTERNATIONAL INC.
                              One Baxter Parkway
                          Deerfield, Illinois  60015
                                 847.948.2212
_______________________________________________________________________________
                 (Name, Address and Telephone Number of Person
               Authorized to Receive Notices and Communications)


                               December 17, 1999
            ------------------------------------------------------
            (Date of Event which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
Schedule because of Rule 13d-1(e), 13d-1(f) or 13d-1(g), check the following
box[_].

NOTE: Schedules filed in paper format should include a signed original and five
      (5) copies of the schedule, including all exhibits.  See Rule 13d-7(b) for
      other parties to whom copies are to be sent.

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

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

                        (Continued on following page(s))
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- -------------------------------------------------------------------------------


     1)  Names of Reporting Persons S.S. or I.R.S. Identification Nos. of Above
         Persons (entities only)

         BAXTER INTERNATIONAL INC.
         I.R.S. Identification Number: 36-0781620

         BAXTER HEALTHCARE CORPORATION
         I.R.S. Identification Number: 36-2604143
________________________________________________________________________________

     2)  Check the Appropriate Box if a Member of a Group (See Instructions)
    (a)  [_]
    (b)  [_]
________________________________________________________________________________

     3)  SEC Use Only
________________________________________________________________________________

     4)  Source of Funds (See Instructions)
         WC
________________________________________________________________________________

     5)  Check if Disclosure of Legal Proceedings is Required Pursuant to Items
         2(d) or 2(e)
________________________________________________________________________________

     6)  Citizenship or Place of Organization
         DELAWARE
________________________________________________________________________________

                    (7)   Sole Voting Power
                          -0-
                    ___________________________________________________________
Number of Shares
Beneficially Owned  (8)   Shared Voting Power
by Each Reporting         14,000,000
Person with         ___________________________________________________________

                    (9)   Sole Dispositive Power
                          -0-
                    ____________________________________________________________

                    (10)  Shared Dispositive Power
                          14,000,000
_______________________________________________________________________________

    (11)  Aggregate Amount Beneficially Owned by Each Reporting Person
          46,290,181 (Includes the right to acquire 5,200,000 shares of Common
          Stock pursuant to the Warrant (as defined herein) and the right to
          acquire 27,090,181 shares of Common Stock pursuant to the shares of
          Series A Preferred Stock described herein )

________________________________________________________________________________

     (12) Check if the Aggregate Amount in Row (11) Excludes Certain Shares (See
          Instructions)
          [_]
________________________________________________________________________________

     (13) Percent of Class Represented by Amount in Row (11) 46.94% (Assumes the
          exercise of the Warrant and the conversion of the shares of Series A
          Preferred Stock, neither of which have occurred )

________________________________________________________________________________

     (14) Type of Reporting Person (See Instructions)
          CO
________________________________________________________________________________

                               Page 2 of 8 pages
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_______________________________________________________________________________


This Amendment No. 4 amends and restates the Schedule 13D relating to the
holdings of Baxter Healthcare Corporation, a Delaware corporation ("Purchaser"),
of 14,000,000 shares (the "Shares") of common stock, $0.001 par value per share
("Common Stock"), of Nexell Therapeutics Inc. (formerly known as VIMRx
Pharmaceuticals Inc.) (the "Company"); a Warrant to purchase 5,200,000 shares of
Common Stock; and 74,498 shares of Series A Preferred Stock presently
convertible into 27,090,181 shares of Common Stock.


ITEM 1.  SECURITY AND ISSUER.
This statement relates to the Common Stock of the Company.  The address of the
principal executive offices of the Company is:

                                   9 Parker
                         Irvine, California 92618-1605
                            Telephone: 949.470.9011

ITEM 2.  IDENTITY AND BACKGROUND.
This statement is being filed by Purchaser and Baxter International Inc., a
Delaware corporation and the owner of 100% of the capital stock of Purchaser
(the "Parent").  The principal executive offices of Purchaser and Parent are:

                              One Baxter Parkway
                           Deerfield, Illinois 60015
                            Telephone: 847.948.2000

Purchaser and Parent, through its subsidiaries, are engaged in the worldwide
development, distribution and manufacture of a diversified line of products,
systems and services used primarily in the health care field.

Neither Parent nor Purchaser, nor, to the best of the knowledge of Parent and
Purchaser, any director or executive officer of Parent or Purchaser, has been,
during the last five years, (a) convicted in a criminal proceeding (excluding
traffic violations or similar misdemeanors) or (b) a party to a civil proceeding
of a judicial or administrative body of competent jurisdiction and as a result
of such proceeding was or is subject to a judgment, decree or final order
enjoining future violations of, or prohibiting or mandating activities subject
to, federal or state securities laws or finding any violation with respect to
such laws.

ITEM 3.  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATION
As described in Item 4 below, in consideration of the Purchaser's tender of
common stock, warrants and debentures of Issuer's subsidiary to the Issuer,
Purchaser received from Issuer 3,000,000 shares of Common Stock, a warrant to
purchase 5,200,000 shares of Common Stock, and certain debentures of the Issuer.

                               Page 3 of 8 Pages
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- --------------------------------------------------------------------------------

ITEM 4.  PURPOSE OF TRANSACTION.
Prior to June 30, 1999, the Company owned 80.5% of Nexell of California, Inc.
(formerly known as Nexell Therapeutics Inc.) ("Sub"), the Company's principal
business unit, which it acquired through the acquisition of certain assets from
Purchaser in December 1997 in exchange for (1) 11,000,000 shares of Common
Stock, (2) 66,304 shares of Series A Convertible Preferred Stock of the Company
with a liquidation value of $1,000 per share ("Series A Preferred Stock"), (3)
19.5 % of Sub's outstanding common stock, (4) a warrant to purchase an
additional 6% of Sub's common stock for $6,000,000, and (5) the right of
Purchaser to receive payments from Sub upon the occurrence of certain milestone
events, which could aggregate $21,000,000 if all the milestones were achieved.
In addition, for $30,000,000 paid to Sub, Purchaser received $30,000,000
principal amount of Sub's 6 1/2% convertible subordinated debentures convertible
into Sub's common stock upon a public offering of common stock by Sub.

The acquisition by the Company of Purchaser's interests in Sub, other than its
right to milestone payments, was effected through an exchange of Purchaser's
interests in Sub for an equivalent value of interests directly in the Company
(the "Acquisition"). The Company and Purchaser agreed to exchange Purchaser's
interests in Sub (common stock, warrant and convertible subordinated debentures,
but excluding its right to milestone payments ) for:

 .   3,000,000 shares of Common Stock;

 .   an adjustment of the conversion price of the 70,282 outstanding shares of
    Series A Preferred Stock owned by Purchaser from $5.50 per share to $2.75
    per share (the 3,978 share increase from the 66,304 shares originally issued
    are a result of dividends payable in kind) ;

 .   a warrant to purchase 5,200,000 shares of Common Stock at a price of $1.15
    per share (the "Warrant"); and

 .   $32,884,537.50 principal amount of 6 1/2% Convertible Subordinated
    Debentures (replacing the $30,000,000 principal amount of Sub's 6 1/2%
    convertible subordinated debentures plus accrued interest through the
    closing date of the Acquisition) convertible, commencing November 30, 2002,
    into Common Stock at a conversion price equal to 95% of the average of the
    closing prices of the Common Stock on the Nasdaq National Market for the 30
    consecutive trading days preceding the date of conversion .

On December 17, 1999, pursuant to the terms of the Series A Preferred Stock
owned by Purchaser, the Company issued 4,216 additional shares of Series A
Preferred Stock to Purchaser as a result of dividends payable in kind.

Other than as described herein in Items 4 and 6, neither Purchaser nor Parent
presently has any plans or proposals which relate to, or may result in, any of
the matters listed in Items 4(a) - 4(j) of Schedule 13D, although each reserves
the right to develop such plans.

                               Page 4 of 8 Pages
<PAGE>

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

ITEM 5.  INTEREST IN SECURITIES OF THE ISSUER.
Except as set forth herein, neither Purchaser, Parent, nor, to the best of the
knowledge of Purchaser and Parent, any director or executive officer of
Purchaser or Parent beneficially owns any other shares of Common Stock of the
Company.

     (a) Purchaser and Parent beneficially own an aggregate of 14,000,000 shares
         of Common Stock, which constitute approximately 19.25% of the total
         number of presently outstanding shares of Common Stock.  Purchaser and
         Parent also each beneficially own the right to acquire up to 5,200,000
         more shares of Common Stock pursuant to the Warrant.  In addition,
         Purchaser and Parent each beneficially own 74,498 shares of Series A
         Preferred Stock, presently convertible into 27,090,181 shares of Common
         Stock.  Assuming the exercise of the Warrant and the conversion of the
         shares of Series A Preferred Stock, Purchaser and Parent would each
         beneficially own 46,290,181 shares of Common Stock, which would
         constitute approximately 46.94% of the outstanding shares of Common
         Stock.

     (b) Purchaser and Parent share the power to vote and dispose of the Shares,
         subject to the Voting Agreement described under Item 6 below.

     (c) As described in Item 4 above, on December 17, 1999, pursuant to the
         terms of the Series A Preferred Stock owned by Purchaser, the Company
         issued 4,216 additional shares of Series A Preferred Stock to Purchaser
         as a result of dividends payable in kind.

     (d) Not applicable.

     (e) Not applicable.

ITEM 6.  CONTRACTS OR ARRANGEMENTS WITH RESPECT TO ISSUER SECURITIES.
In addition to the agreement documenting the Acquisition described in Item 4
above, Purchaser has entered into the following contracts or arrangements with
the Company and others with respect to the Company's securities:

The Series A Preferred Stock
- ----------------------------
Purchaser holds 74,498 shares of Series A Preferred Stock, which are presently
convertible at the option of the Purchaser.  The shares will automatically
convert into Common Stock on December 17, 2004 or upon other specified events,
if not otherwise already converted.  The conversion price at which shares of
Common Stock will be deliverable upon conversion without the payment of
additional consideration by Purchaser is $2.75 per share, subject to adjustment
for stock splits and combinations, certain dividends and distributions, and
reclassification, exchange or substitution.  There is a 6% dividend payable
annually in kind on the shares of Series A Preferred Stock.  Accordingly, if
Purchaser does not convert any shares prior to December 17, 2004, on such date
it would own 99,697 shares of Series A Preferred Stock as a result of the
additional shares of Series A Preferred Stock issued in payment of the 6% annual
dividend; such 99,697 shares would automatically convert into 36,253,345 shares
of Common Stock on such date.

                               Page 5 of 8 Pages
<PAGE>

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

The Warrant
- -----------

The Warrant entitles Purchaser to purchase up to 5,200,000 shares of Common
Stock at any time prior to May 27, 2006 at 5:00 p.m. at a purchase price of
$1.15 per share, subject to adjustment from time to time in the event of cash
dividends, stock dividends, stock subdivisions, stock splits, stock combinations
or reverse stock splits.

The 6 1/2% Convertible Subordinated Debentures
- ----------------------------------------------

The 6 1/2% Convertible Subordinated Debentures were repaid in full on November
24, 1999 with part of the proceeds from the private placement described below
and are no longer outstanding.

Registration Rights Agreement
- -----------------------------

Purchaser and the Company are parties to a Registration Rights Agreement whereby
the Company has granted certain demand and piggyback rights to Purchaser.

Voting Agreement
- ----------------

Purchaser is a party to a Voting Agreement with certain other stockholders of
the Company pursuant to which all parties agree to vote all of their Common
Stock of the Company in favor of one Purchaser-nominated director.  In addition,
Purchaser agrees to vote all of its Common Stock of the Company in favor of the
nominees for director recommended by the Company's nominating committee.

Relationship Restructuring
- --------------------------

On November 24, 1999, Purchaser and the Company entered into a Put Agreement
whereby Purchaser agreed to issue Put Rights in connection with the private
placement by the Company of $63,000,000 aggregate principal amount of Series B
Preferred Stock, warrants to purchase common stock of Company, and Put Rights.
Each Put Right entitles the holder to cause Purchaser to purchase the shares of
Series B Preferred Stock during a specified time frame at a price equal to the
original purchase price of the Series B Preferred Stock plus a specified rate of
return. The Put Right is exercisable by holders at any time between November 24,
2002 and November 24, 2004, unless earlier terminated as provided in the Put
Certificate. In addition, Purchaser and the Company entered into a Side Letter
whereby the conversion price of the Series B Preferred Stock is to be adjusted
downward per the terms of the Side Letter in the event of a put to Purchaser of
the Series B Preferred Stock by the holders.

Except as set forth above, to the best knowledge of Purchaser and Parent, no
contracts, arrangements, understandings or  relationships  (legal or otherwise)
exist  among the persons named in Item 2 above, or between such persons and any
other person with respect to any securities of the Company, including, but not
limited to, transfer or voting of such securities, finder's fees, joint
ventures, loan or option arrangements, puts or calls, guarantees of profits,
division of profits or loss, or the giving or withholding or proxies.

                               Page 6 of 8 Pages
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- --------------------------------------------------------------------------------

ITEM 7.  MATERIALS TO BE FILED AS EXHIBITS.

EXHIBIT 7.1*  Acquisition Agreement dated February 18, 1998, by and among the
              Company, Purchaser and Sub (incorporated by reference to Annex A
              of the Proxy Statement contained in the Schedule 14-A filed by the
              Company) (Commission File No. 000-19153) on April 13, 1999.

EXHIBIT 7.2*  Common Stock Purchase Warrant for 5,200,000 shares of Common
              Stock of Nexell Therapeutics Inc.

EXHIBIT 7.3   Omitted

EXHIBIT 7.4   Omitted

EXHIBIT 7.5*  Registration Rights Agreement, dated December 17, 1997, by
              and between Purchaser and the Company

EXHIBIT 7.6*  Voting Agreement, dated December 17, 1997, by and between
              Purchaser, Lindsay A. Rosenwald, M.D., Paramount Capital Asset
              Management Inc., Donald Drapkin, Richard L. Dunning, Laurence D.
              Fink and Eric A. Rose

EXHIBIT 7.7*  Put Agreement, dated November 24, 1999, by and between
              Purchaser and the Company

EXHIBIT 7.8*  Form of Put Certificate held by the Investors

EXHIBIT 7.9*  Side Letter dated November 24, 1999, by and between the
              Purchaser and the Company


______________________________
*      Previously Filed

                              Pages 7 of 8 Pages
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- -------------------------------------------------------------------------------

                               S I G N A T U R E

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

Dated:  January 10, 2000

                                    BAXTER HEALTHCARE CORPORATION


                                    By:  /s/ Jan Stern Reed
                                         ------------------
                                         Jan Stern Reed
                                         Secretary



                                    BAXTER INTERNATIONAL INC.


                                    By:  /s/ Jan Stern Reed
                                         ------------------
                                         Jan Stern Reed
                                         Secretary


                              Pages 8 of 8 Pages


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