N-benzyloxycarbonyl-L-glutam-γ-propylamide t-butyl ester

p-[N-methyl-N-(trifluoroacetyl)amino]benzoyl chloride

(S)-2-Amino-4-propylcarbamoyl-butyric acid tert-butyl ester

(S)-2-(4-Methylamino-benzoylamino)-4-propylcarbamoyl-butyric acid tert-butyl ester

(S)-2-{4-[Methyl-(2,2,2-trifluoro-acetyl)-amino]-benzoylamino}-4-propylcarbamoyl-butyric acid tert-butyl ester