2,2-Dimethyl-propionic acid (R)-1-((9S,10S,13R,17S)-10-hydroxymethyl-13-methyl-3-oxo-2,3,9,10,11,12,13,15,16,17-decahydro-1H-cyclopenta[a]phenanthren-17-yl)-ethyl ester 在
sodium tetrahydroborate 作用下,
生成 2,2-Dimethyl-propionic acid (R)-1-((3S,9S,10S,13R,17S)-3-hydroxy-10-hydroxymethyl-13-methyl-2,3,9,10,11,12,13,15,16,17-decahydro-1H-cyclopenta[a]phenanthren-17-yl)-ethyl ester