(E)-3,3-ethylenedioxy-21-hydroxy-20-methoxy-10-(2-propynyl)-19-norpregna-5,17(20)-diene 生成 2-hydroxy-1-[(8S,9S,10S,13S,14S,17S)-13-methyl-10-prop-2-ynylspiro[1,2,4,7,8,9,11,12,14,15,16,17-dodecahydrocyclopenta[a]phenanthrene-3,2'-1,3-dioxolane]-17-yl]ethanone