溴乙烷 、
Acetic acid (5S,8R,9S,10S,12S,13S,14S,17S)-17-(2-bromomethyl-[1,3]dioxolan-2-yl)-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-12-yl ester 生成 1-((5S,8R,9S,10S,12S,13S,14S,17S)-12-Hydroxy-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-17-yl)-butan-1-one