Proprietary Name Letter - XYNTHA

Our STN: BL 125264/0

Wyeth Pharmaceuticals, Inc.
 Attention: Joyce Schwenk
 P.O. Box 8299
 Philadelphia, PA 19101-8299

Dear Ms. Schwenk:

This letter is in regard to your proposed proprietary names for Antihemophilic Factor (Recombinant), Plasma/Albumin-Free "Xyntha" received on September 26, 2007.

We have considered your proposed proprietary name, "Xyntha" in consultation with CBER's Advertising and Promotional Labeling Branch (APLB) and conclude that under 21 CFR Part 201, the proposed proprietary name "Xyntha" be found acceptable.

If you have any questions, please contact Pauline Cottrell, at (301) 827-6162.

Sincerely yours,

/Basil Golding, M.D./
 Basil Golding, M.D.
 Director
 Division of Hematology
 Office of Blood Research and Review
 Center for Biologics Evaluation and Research
