2-(R)-(3-(R)-formyl-4-(S) phenylpyrrolidin-1-yl)-3-(cyclopropyl)propanoic acid (4-methoxy)benzyl ester 生成 2-(R)-(3-(S)-((4-(3,3-Difluoro-3-(4-fluorophenyl)propyl)piperidin-1-yl)methyl)-4-(S)-(3-fluorophenyl)pyrrolidin-1-yl)-3-(cyclopropyl)propanoic acid