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

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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Reexamination Certificate

active

06887860

ABSTRACT:
This invention discloses (20S)-1α-hydroxy-2-methylene-19-nor-bishomopregnacalciferol and pharmaceutical uses therefor. This compound exhibits pronounced activity in arresting the proliferation of undifferentiated cells and inducing their differentiation to the monocyte thus evidencing use as an anti-cancer agent and for the treatment of skin diseases such as psoriasis as well as skin conditions such as wrinkles, slack skin, dry skin and insufficient sebum secretion. This compound also has little, if any, calcemic activity and therefore may be used to treat immune disorders in humans as well as renal osteodystrophy.

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Hareau et al, “Asymmetric Synthesis of 1Alpha,25-Dihydroxyvitamin D3 A-Ring Precursor Starting with 5-Tert-Butyldlmethylsiloxy-2-Cyclohexenone”, Tetrahedron Letters, 41, 2000, pp. 2385-2388.
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