2-[(3R,4S,5S,8S,9S,10S,11R,13R,14S,16R)-16-Bromo-3,11-dihydroxy-4,8,10,14-tetramethyl-hexadecahydro-cyclopenta[a]phenanthren-(17Z)-ylidene]-6-methyl-heptanoic acid acetoxymethyl ester 在
吡啶 、
chromium(VI) oxide 、 sodium tetrahydroborate 、
硫酸 作用下,
生成
2-[(3S,4S,5S,8S,9S,10S,11R,13R,14S,16R)-16-Bromo-11-hydroxy-3-methanesulfonyloxy-4,8,10,14-tetramethyl-hexadecahydro-cyclopenta[a]phenanthren-(17Z)-ylidene]-6-methyl-heptanoic acid acetoxymethyl ester