[(2E)-2-cyano-2-[(8'R,10'R,13'S,14'S)-10',13'-dimethylspiro[1,3-dioxolane-2,3'-2,6,7,8,12,14,15,16-octahydro-1H-cyclopenta[a]phenanthrene]-17'-ylidene]ethyl] acetate 生成
[2-[(8R,10R,13S,14S,17S)-17-hydroxy-10,13-dimethyl-3-oxo-2,6,7,8,12,14,15,16-octahydro-1H-cyclopenta[a]phenanthren-17-yl]-2-oxoethyl] acetate