(1alpha,3beta,5E,7E)-1,3-二[[(叔丁基)二甲基硅烷基]氧基]-9,10-开环胆甾-5,7,10(19)-三烯-24-羧酸乙酯

(1alpha,3beta,5E,7E)-1,3-Bis[[(1,1-dimethylethyl)dimethylsilyl]oxy]-9,10-secochola-5,7,10(19)-triene-24-carboxylic acid ethyl ester