Pregn-4-en-3-one,20b-hydroxy- (8CI);20b-Dihydroprogesterone;20b-Hydroxy-D4-pregnen-3-one;20b-Hydroxypregn-4-en-3-one;20b-Hydroxyprogesterone;20b-Progerol;4-Pregnene-20b-ol-3-one;Pregn-4-en-20b-ol-3-one;Pregn-4-ene-20b-hydroxy-3-one;Progesterol-20b;D4-Pregnen-20b-ol-3-one;D4-Pregnene-20b-ol-3-one;4-Pregnen-20-beta-ol-3-one;
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