Acetic acid (8R,9S,13S,14S,16R,17R)-3-acetoxy-13-ethyl-6,7,8,9,11,12,13,14,15,16-decahydro-20-oxa-cyclopropa[16,17]cyclopenta[a]phenanthren-17-yl ester 生成 Acetic acid (8R,9S,13S,14S,16R,17R)-3-acetoxy-13-ethyl-17-ethynyl-17-hydroxy-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-16-yl ester