(R)-4-((5R,7R,8S,9S,10R,13R,14S,17R)-7-Hydroxy-10,13-dimethyl-3-oxo-4,5,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-3H-cyclopenta[a]phenanthren-17-yl)-pentanoic acid methyl ester 在
alkaline hydrogen peroxide 作用下,
生成
(R)-4-((1S,2S,5R,7R,8S,9S,10S,13R,14S,17R)-7-Hydroxy-10,13-dimethyl-3-oxo-hexadecahydro-20-oxa-cyclopropa[1,2]cyclopenta[a]phenanthren-17-yl)-pentanoic acid methyl ester