(2S,3S,7aR,7bS,9aS,10S,12aS,12bS,14aS)-10-acetyl-9a-methyl-5,5-dioxidohexadecahydro-7H-3,7a-methanocyclopenta[5,6]naphtho[2,1-g][1,2,3]oxathiazonin-2-yl acetate 在
甲醇 、 potassium hydroxide 作用下,
以99%的产率得到3α-hydroxy-S,S-dioxo-19,2-(epoxythioimino)pregnan-20-one