乙酸酐 、
(3S,5S,8R,9S,10S,13S,14S,17S)-3-(1,2-Dihydroxy-ethyl)-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthrene-3,17-diol 在
吡啶 作用下,
生成 Acetic acid 2-acetoxy-1-((3S,5S,8R,9S,10S,13S,14S,17S)-17-acetoxy-3-hydroxy-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-3-yl)-ethyl ester