上游原料
2-[(8S,10R,13S,14S)-10,13-dimethyl-3-oxo-6,7,8,10,12,13,14,15-octahydro-3H-cyclopenta[a]phenanthren-17-yl]-2-oxoethyl acetateMethylmagnesium chloride(E)-2-((8S,10S,13S,14S,16R)-10,13,16-trimethyl-3-oxo-3,6,7,8,10,12,13,14,15,16-decahydro-17H-cyclopenta[a]phenanthren-17-ylidene)-3-((trimethylsilyl)oxy)propyl acetate2-oxo-2-((8S,10S,13S,14S,16R,17R)-10,13,16-trimethyl-3-oxo-17-((trimethylsilyl)oxy)-6,7,8,10,12,13,14,15,16,17-decahydro-3H-cyclopenta[a]phenanthren-17-yl)ethyl acetate2-((8S,10S,13S,14S,16R,17R)-17-hydroxy-10,13,16-trimethyl-3-oxo-6,7,8,10,12,13,14,15,16,17-decahydro-3H-cyclopenta[a]phenanthren-17-yl)-2-oxoethyl acetate
