Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – Cyclopentanohydrophenanthrene ring system doai
Reexamination Certificate
2005-11-29
2005-11-29
Jiang, Shaojia Anna (Department: 1617)
Drug, bio-affecting and body treating compositions
Designated organic active ingredient containing
Cyclopentanohydrophenanthrene ring system doai
C514S178000, C552S500000, C552S501000
Reexamination Certificate
active
06969708
ABSTRACT:
The invention pertains to a process for the preparation of a high purity composition of (7α, 17α)-17-hydroxy-7-methyl-19-nor-17-pregn-5(10)-en-20-yn-3-one. The process provides for a composition with less than 0.5% of (7α, 17α)-17-hydroxy-7-methyl-19-nor-17-pregn-4-en-20-yn-3-one. This composition can be used as a source for the preparation of stable pharmaceutical dosage units.
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Kirchholtes Peter H. G. M.
Sas Gerard A. J. M. T.
Akzo Nobel N.V.
Jiang Shaojia Anna
TraskBritt
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