(S)-2-[3-({[({[(Ethoxycarbonylmethyl-carbamoyl)-methyl]-carbamoyl}-methyl)-carbamoyl]-methyl}-carbamoyl)-4-phenoxymethyl-phenylcarbamoyl]-pyrrolidine-1-carboxylic acid tert-butyl ester

(2-{2-[2-(5-{[(S)-1-((S)-2-Benzyloxycarbonylamino-6-tert-butoxycarbonylamino-hexanoyl)-pyrrolidine-2-carbonyl]-amino}-2-phenoxymethyl-benzoylamino)-acetylamino]-acetylamino}-acetylamino)-acetic acid ethyl ester

((S)-5-Benzyloxycarbonylamino-6-{(S)-2-[3-({[({[(hydrazinocarbonylmethyl-carbamoyl)-methyl]-carbamoyl}-methyl)-carbamoyl]-methyl}-carbamoyl)-4-phenoxymethyl-phenylcarbamoyl]-pyrrolidin-1-yl}-6-oxo-hexyl)-carbamic acid tert-butyl ester