Acetic acid (3S,8R,9S,10S,13S,14S,17S)-3-hydroxy-13-methyl-10-vinyl-2,3,4,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl ester 在
铬酸 作用下,
生成
Acetic acid (8R,9S,10S,13S,14S,17S)-13-methyl-3-oxo-10-vinyl-2,3,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-17-yl ester