Acetic acid 2-((1S,2R,4aS,4bS,10aR,10bS,11S,12aS)-11-hydroxy-2,10a,12a-trimethyl-8-oxo-1,2,3,4,4a,4b,5,6,8,10a,10b,11,12,12a-tetradecahydro-chrysen-1-yl)-2-oxo-ethyl ester 在
吡啶 、
甲基磺酰氯 作用下,
生成
21-Acetoxy-17α-methyl-D-homopregna-1,4,9(11)-trien-3,20-dion