Acetic acid (2R,6R,8S,10R,13S,14S,17R)-17-(2-acetoxy-acetyl)-2,6-difluoro-10,13-dimethyl-3-oxo-2,3,6,7,8,10,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl ester 生成 Acetic acid (2R,6R,8S,9R,10S,11S,13S,14S,17R)-17-(2-acetoxy-acetyl)-9-bromo-2,6-difluoro-11-hydroxy-10,13-dimethyl-3-oxo-2,3,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl ester