2,3,4-tri-O-acetyl-L-rhamnopyranosyl bromide 、
20α-(tert-butyldimethylsiloxy)-5β,14β-pregnane-3β,14-diol 生成 [(2S,3S,4R,5R,6R)-4,5-diacetyloxy-6-[[(3S,5R,8R,9S,10S,13R,14S,17S)-14-hydroxy-17-[(1S)-1-hydroxyethyl]-10,13-dimethyl-1,2,3,4,5,6,7,8,9,11,12,15,16,17-tetradecahydrocyclopenta[a]phenanthren-3-yl]oxy]-2-methyloxan-3-yl] acetate