5.alpha.-Pregnane-3,20-dione, 11.beta.,17,21-trihydroxy-, 21-(3,3-dimethylbutyrate) 5936-24-3 Hydrallostane 21-tert-butylacetate NSC15485 Pregnane-3,20-dione, 21-[(3,3-dimethyl-1-oxobutyl)oxy]-11,17-dihydroxy-, (5.alpha.,11.beta.)-