1-[(8R,9S,10R,13S,14S,16R,17R)-17-hydroxy-10,13,16-trimethyl-3-pyrrolidin-1-yl-1,2,7,8,9,11,12,14,15,16-decahydrocyclopenta[a]phenanthren-17-yl]ethanone 生成 2-bromo-1-[(8R,9S,10R,13S,14S,16R,17R)-17-hydroxy-10,13,16-trimethyl-3-pyrrolidin-1-yl-1,2,7,8,9,11,12,14,15,16-decahydrocyclopenta[a]phenanthren-17-yl]ethanone