3-{[2-(1-tert-butoxycarbonylamino-ethyl)-thiazole-4-carbonyl]-amino}-2-methyl-hexanoic acid 1-({1-[(1-tert-butoxycarbonyl-2-methyl-propyl)-methyl-carbamoyl]-2-phenyl-ethyl}-methyl-carbamoyl)-ethyl ester

2-{(S)-1-[(S)-2-((S)-2-tert-Butoxycarbonylamino-3-methyl-butyrylamino)-3-hydroxy-propionylamino]-ethyl}-thiazole-4-carboxylic acid ethyl ester

ethyl 2-((S)-1-((S)-2-amino-6-(((benzyloxy)carbonyl)amino)hexanamido)ethyl)thiazole-4-carboxylate

ethyl 2-((S)-1-((S)-6-(((benzyloxy)carbonyl)amino)-2-((S)-1-(2-(2-((S)-1-((tert-butoxycarbonyl)-D-phenylalanyl)pyrrolidin-2-yl)thiazol-4-yl)oxazole-4-carbonyl)pyrrolidine-2-carboxamido)hexanamido)ethyl)thiazole-4-carboxylate

2-((S)-1-((S)-6-(((benzyloxy)carbonyl)amino)-2-((S)-1-(2-(2-((S)-1-((tert-butoxycarbonyl)-D-phenylalanyl)pyrrolidin-2-yl)thiazol-4-yl)oxazole-4-carbonyl)pyrrolidine-2-carboxamido)hexanamido)ethyl)thiazole-4-carboxylic acid