.DELTA.5-Pregnenolone 145-13-1 3.beta.-Hydroxypregn-5-en-20-one 5-Pregnen-3.beta.-ol-20-one Arthenolone Bina-Skin Enelone NSC1616 Natolone Pregn-5-en-20-one, 3-hydroxy-, (3.beta.)- Pregn-5-en-20-one, 3.beta.-hydroxy- Pregnenolone Pregnetan Pregneton Pregnolon Prenolon Regnosone Skinostelon