Acetic acid 2-((5R,6R,8S,9S,10R,11R,13S,14S,16S,17R)-2-bromo-6-fluoro-5,11,17-trihydroxy-10,13,16-trimethyl-3-oxo-hexadecahydro-cyclopenta[a]phenanthren-17-yl)-2-oxo-ethyl ester 在
silver fluoride 作用下,
生成
Acetic acid 2-((2R,5R,6R,8S,9S,10R,11R,13S,14S,16S,17R)-2,6-difluoro-5,11,17-trihydroxy-10,13,16-trimethyl-3-oxo-hexadecahydro-cyclopenta[a]phenanthren-17-yl)-2-oxo-ethyl ester