乙酸酐 、
(22R)-23,23-difluoro-3α,22-dihydroxy-24,24-dimethyl-5α-cholan-6-one 在
吡啶 作用下,
生成 Acetic acid (3R,5S,8S,9S,10R,13S,14S,17R)-17-((1S,2R)-2-acetoxy-3,3-difluoro-1,4-dimethyl-pentyl)-10,13-dimethyl-6-oxo-hexadecahydro-cyclopenta[a]phenanthren-3-yl ester