(2R,3S)-2-(methoxymethoxy)-3-[(3S,8S,9S,10R,13S,14S,17R)-3-(methoxymethoxy)-10,13-dimethyl-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl]butanal 、
异丁基溴化镁 生成 (22R,23R)-3β,22,23-trihydroxycholest-5-ene 3,22-dimethoxymethyl ether