SEC Comment Letter for Theriva Biologics, Inc. (TOVX) (CIK 0000894158) (TOVX) — Jan 24, 2007

Theriva Biologics, Inc. (TOVX) (CIK 0000894158)
Date: Jan. 24, 2007 · CIK: 0000894158 · Accession: 0000000000-07-003659

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File numbers found in text: 333-139354

Date

January 24, 2007

Author

Jeffrey P. Riedler

Form

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Company

Theriva Biologics, Inc. (TOVX) (CIK 0000894158)

Letter

Mail Stop 6010 January 24, 2007 Mr. Steve H. Kanzer Chief Executive Officer Pipex Pharmaceuticals, Inc. 3985 Research Park Drive Ann Arbor, MI 48108

Re: Pipex Pharmaceuticals, Inc. Registration Statement on Form SB-2 Filed on December 14, 2006 File Number 333-139354

Dear Mr. Kanzar:

We have received your response letter da ted January 5, 2007 and have the following additional comment. 1. Please provide us your analysis as to whethe r you consider Ridgeback Capital Investment Ltd. to be an “affiliate” of the Company. We may have further comments after receiving your response.

* * *

Mr. Steve H. Kanzer Pipex Pharmaceuticals, Inc. January 24, 2007 Page 2 Please furnish a letter on EDGAR under the form type label CORRESP in response to our comment. Detailed letters greatly facilitate our review. Please contact Sonia Barros at (202) 551-3655 with any questions.

S i n c e r e l y ,

J e f f r e y P . R i e d l e r A s s i s t a n t D i r e c t o r

cc: Hank Gracin, Esq. Lehman & Eilen LLP Mission Bay Office Plaza Suite 300 20283 State Road 7 Boca Raton, FL 33498

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Mail Stop 6010

       January 24, 2007

Mr. Steve H. Kanzer
Chief Executive Officer Pipex Pharmaceuticals, Inc. 3985 Research Park Drive Ann Arbor, MI 48108

Re: Pipex Pharmaceuticals, Inc.
  Registration Statement on Form SB-2
  Filed on December 14, 2006
  File Number 333-139354

Dear Mr. Kanzar:

We have received your response letter da ted January 5, 2007 and have the following
additional comment.
1. Please provide us your analysis as to whethe r you consider Ridgeback Capital Investment
Ltd. to be an “affiliate” of the Company.  We  may have further comments after receiving
your response.

* * *

Mr. Steve H. Kanzer
Pipex Pharmaceuticals, Inc.
January 24, 2007 Page 2
Please furnish a letter on EDGAR under the form type label CORRESP in response to
our comment.  Detailed letters greatly facilitate  our review.  Please contact Sonia Barros at (202)
551-3655 with any questions.

       S i n c e r e l y ,

       J e f f r e y  P .  R i e d l e r
       A s s i s t a n t  D i r e c t o r

cc: Hank Gracin, Esq.
Lehman & Eilen LLP Mission Bay Office Plaza Suite 300 20283 State Road 7 Boca Raton, FL 33498

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