(S)-2-[(Z)-2-(2-tert-Butoxycarbonylamino-acetylamino)-3-phenyl-acryloylamino]-4-methyl-pentanoic acid

Boc-Gly-D-Phe-Leu-NH2

L-Leucinamide, N-[(1,1-dimethylethoxy)carbonyl]glycyl-L-phenylalanyl-

({(R)-1-[(S)-3-Methyl-1-(N'-phenyl-hydrazinocarbonyl)-butylcarbamoyl]-2-phenyl-ethylcarbamoyl}-methyl)-carbamic acid tert-butyl ester