Acetic acid (S)-4-((2S,4aS,4bS,6aS,6bR,7S,8R,9aS,10aS,10bR,12aR)-2-acetoxy-8-cyano-4a,6a,7-trimethyl-octadecahydro-9-oxa-pentaleno[2,1-a]phenanthren-8-yl)-2-methyl-butyl ester 在
氢氧化钾 作用下,
以
乙醇 、
水 为溶剂,
以90.5%的产率得到(1R,2S,4S,6R,7S,8R,9S,12S,13S,16S,18R)-16-hydroxy-6-[(3S)-4-hydroxy-3-methylbutyl]-7,9,13-trimethyl-5-oxapentacyclo[10.8.0.02,9.04,8.013,18]icosane-6-carbonitrile