Acetic acid (8R,9S,10R,13S,14S,17R)-17-acetyl-6-bromo-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 、
原甲酸三甲酯 在
5-磺基水杨酸 作用下,
以
甲苯 为溶剂,
生成
Acetic acid (8R,9S,10R,13S,14S,17R)-17-acetyl-6-bromo-3-methoxy-10,13-dimethyl-2,7,8,9,10,11,12,13,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl ester