(3R,5S,9S,10S,13R,17R)-3-hydroxy-10,13-dimethyl-17-[(2R)-6-methylheptan-2-yl]-1,2,3,4,5,6,7,9,11,12,16,17-dodecahydrocyclopenta[a]phenanthren-15-one 生成 [(3R,5S,9S,10S,13R,17R)-10,13-dimethyl-17-[(2R)-6-methylheptan-2-yl]-15-oxo-1,2,3,4,5,6,7,9,11,12,16,17-dodecahydrocyclopenta[a]phenanthren-3-yl] acetate