17736-20-8 5.alpha.-Pregnane-3.beta.,17.alpha.,21-triol-11,20-dione 21-acetate 5.beta.-Pregnan-3.alpha.,17.alpha.,21-triol-11,20-dione 21-acetate NSC87520 Pregnane-11,20-dione, 21-(acetyloxy)-3,17-dihydroxy-, (3.alpha.,5.beta.)-