上游原料
ethyl formate(3S,8R,9S,10R,13S,14S)-17-acetyl-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15-dodecahydro-1H-cyclopenta[a]phenanthren-3-yl acetate(Z)-3-hydroxy-1-[(3S,8R,9S,10R,13S,14S)-3-hydroxy-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15-dodecahydro-1H-cyclopenta[a]phenanthren-17-yl]-2-propen-1-one(3S,8R,9S,10R,13S,14S)-17-(5-isoxazolyl)-10,13-dimethyl-2,3,4,7,8,9,10,11,12,13,14,15-dodecahydro-1H-cyclopenta[a]phenanthren-3-ol
