L-valine para-nitroanilide
N-carbobenzoxy-alanyl-alanyl-proline
N-carbpbenzoxy-alanine pentafluorophenyl ester
benzyloxycarbonylalanine p-nitrophenyl ester
benzyloxycarbonyl-L-alanyl-L-alanine
3-carboxypropanoyl-alanyl-alanyl-prolyl-valine p-nitroanilide
N-3-carbomethoxypropanoyl-alanyl-alanyl-prolyl-valine p-nitroanilide
(S)-1-[(S)-2-((S)-2-Amino-propionylamino)-propionyl]-pyrrolidine-2-carboxylic acid [(S)-2-methyl-1-(4-nitro-phenylcarbamoyl)-propyl]-amide