[(3S,5R,8R,9S,10S,13R,14S,16S)-3,16-Diacetoxy-14-hydroxy-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-(17Z)-ylidene]-acetic acid ethyl ester 在
吡啶 、
乙酸酐 作用下,
以
丙酮 为溶剂,
生成 [(3S,5R,8R,9S,10S,13R,14S,16S)-3,16-Diacetoxy-14-hydroxy-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-(17E)-ylidene]-acetic acid ethyl ester