2-methylene-19-nor-(20S)-1α-hydroxy-trishomopregnacalc...

Drug – bio-affecting and body treating compositions – Designated organic active ingredient containing – 9,10-seco- cyclopentanohydrophenanthrene ring system doai

Reexamination Certificate

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C552S653000

Reexamination Certificate

active

07541348

ABSTRACT:
Compounds of formula I are provided where X1and X2are independently selected from H or hydroxy protecting groups. Such compounds may be used in preparing pharmaceutical compositions and are useful in treating a variety of biological conditions.

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