145-14-2 20(S)-Hydroxyprogesterone 20-.alpha.-Dihydroprogesterone 20.alpha.-Dihydroprogesterone 20.alpha.-Hydroxydihydroprogesterone 20.alpha.-Hydroxypreg-4-en-3-one 20.alpha.-Hydroxypregnen-2-one 20.alpha.-Hydroxyprogesterone 20.alpha.-Progerol NSC68630 Pregn-4-en-3-one, 20-hydroxy-, (20S)- Pregn-4-en-3-one, 20.alpha.-hydroxy- Progesterol-20.alpha.