11β-Hydroxy-spiro-(2',2'-dimethyl-1',3'-dioxolane)-4',17-androst-5-en-3-one 3-(Ethylene acetal)

(8aS,9R,11aS,11bS)-2',2',8a-trimethyl-1,2,3a,4,8,8a,10,11,11a,11b-decahydrospiro[indeno[4,5-h]indazole-9,4'-[1,3]dioxolane]-3,7-dione