Acetic acid (R)-1-((8S,9S,10S,13R,17S)-8,9-dihydroxy-10,13-dimethyl-11-oxo-hexadecahydro-cyclopenta[a]phenanthren-17-yl)-ethyl ester 在
lead(IV) acetate 作用下,
生成
Acetic acid (R)-1-((1S,10aS,13aR)-10a,13a-dimethyl-4,11,12-trioxo-hexadecahydro-benzo[a]cyclopenta[f]cyclodecen-1-yl)-ethyl ester