2-(R)-(3-(R)-formyl-4-(S)-phenylpyrrolidin-1-yl)-2-(cyclohexyl)acetic acid,4-methoxybenzyl ester 、
4-((N-(4-cyanobenzyl)carbamoyl)oxy)piperidine trifluoroacetate 以13 mg (39%)的产率得到2-(R)-(3-(S)-(4-((N-(4-Cyanobenzyl)carbamoyl)oxy)-piperidin-1yl)methyl-4-(S)-phenyl-pyrrolidin-1-yl)-2-(cyclohexyl)acetic acid