Main > PHARMA. > Steroids > Finasteride

Product USA. M

PATENT ASSIGNEE'S COUNTRY USA
UPDATE 03.99
PATENT ASSIGNEE Merck (Rahway; NJ)
PATENT CLAIMS 17Beta-(N-tert-butylcarbamoyl)-4-aza-5alpha-androst-1-en-
-3-one existing in polymorphic Form II prepd by
- Crystallization from mixt of finasteride in organic solvent &
water; solvent & water in amounts sufficient to cause the
soly of solvated form to be exceeded & solvated form to be
less soluble than any other form in mixt
- Recovering resultant solid phase
- Removing solvent
PATENT PHOTOCOPY Available on request

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