((S)-2-{(S)-2-[(S)-2-Amino-3-(1H-indol-3-yl)-propionylamino]-propionylamino}-3-methyl-butyrylamino)-acetic acid benzyl ester

((S)-2-{(S)-2-[(S)-2-(9H-Fluoren-9-ylmethoxycarbonylamino)-3-(1H-indol-3-yl)-propionylamino]-propionylamino}-3-methyl-butyrylamino)-acetic acid benzyl ester

4-{(S)-2-Benzyloxycarbonylamino-2-[(S)-1-((S)-1-carbamoylmethyl-2-phenyl-ethylcarbamoyl)-3-methyl-butylcarbamoyl]-ethyl}-imidazole-1-carboxylic acid benzyl ester