4-amino-N-[[1-(phenylmethyl)cyclopentyl]carbonyl]-L-phenylalanine methyl ester 、
2-甲基-5-硝基苯甲酸 以to give 4-[[(2-methyl-5-nitrophenyl)carbonyl]amino]-N-[[1-(phenylmethyl)cyclopentyl]carbonyl]-L-phenylalanine (34 mg, 69%), HR—FAB—MS的产率得到4-[[(2-methyl-5-nitrophenyl)carbonyl]amino]-N-[[1-(phenylmethyl)cyclopentyl]carbonyl]-L-phenylalanine