英文别名(10R,13S,17S)-10,13-dimethyl-17-(2-methyl-1,3-dioxolan-2-yl)spiro[1,2,4,9,11,12,14,15,16,17-decahydrocyclopenta[a]phenanthrene-3,2'-1,3-dioxolane]; Pregna-5,7-diene-3,20-dione,cyclic 3,20-bis(1,2-ethanediyl acetal); 3,20-Bis(ethylenedioxy)pregna-5,7-diene; Pregna-5,7-diene-3,20-dione Cyclic 3,20-bis(1,2-Ethanediyl Acetal); Pregna-5,7-diene-3,20-dione Cyclic bis(1,2-Ethanediyl Acetal); Pregna-5,7-diene-3,20-dione Cyclic bis(Ethylene Acetal); Pregna-5,7-diene-3,20-dione bis(ethylene acetal); intermediate of dydrogesterone 
