2-(R)-(3-(S)-((4-(3-(4-fluorophenyl)propyl)piperidin-1-yl)methyl)-4-(S)-(3-fluorophenyl)pyrrolidin-1-yl)-3-cyclopentylpropanoic acid, benzyl ester 以20 mg (90%)的产率得到2-(R)-(3-(S)-((4-(3-(4-Fluorophenyl)propyl)piperidin-1-yl)methyl)-4-(S)-(3-fluoro-phenyl)pyrrolidin-1-yl)-3-(cyclopentyl)propanoic acid