(R)-4-((3R,5R,10S,17S)-3-Acetoxy-10,12-dimethyl-2,3,4,5,6,7,10,15,16,17-decahydro-1H-cyclopenta[a]phenanthren-17-yl)-pentanoic acid 在
chromium(VI) oxide 、
硫酸 作用下,
以
丙酮 为溶剂,
生成
(R)-4-((5R,10S,17S)-10,12-Dimethyl-3-oxo-2,3,4,5,6,7,10,15,16,17-decahydro-1H-cyclopenta[a]phenanthren-17-yl)-pentanoic acid