(7E, 22E) - (1R,3R,24R)-1,3-Bis[[dimethyl (1,1-dimethylethyl)silyl]oxy]-24-hydroxy-19-nor-9,10-secocholesta-5,7,22-triene-25-carboxylic acid-1-methylethyl ester 生成 (7E,22E) - (1R,3R,24S)-1,3,24-Trihydroxy-19-nor-9,10-secocholesta-5,7,22-triene-25-carboxylic acid-1-methylethyl ester