(S)-1-{(S)-2-[((S)-2-Benzyloxycarbonylamino-3-methyl-butyryl)-methyl-amino]-3-methyl-butyryl}-pyrrolidine-2-carboxylic acid tert-butyl ester

(2R,3R)-3-Methoxy-2-methyl-N-((S)-2-phenyl-1-thiazol-2-yl-ethyl)-3-[(S)-1-((S)-pyrrolidine-2-carbonyl)-pyrrolidin-2-yl]-propionamide

(S)-1-((S)-2-{[(S)-2-((S)-2-Benzyloxycarbonylamino-3-methyl-butyrylamino)-3-methyl-butyryl]-methyl-amino}-3-methyl-butyryl)-pyrrolidine-2-carboxylic acid

(S)-1-((S)-2-{[(S)-2-((S)-2-Benzyloxycarbonylamino-3-methyl-butyrylamino)-3-methyl-butyryl]-methyl-amino}-3-methyl-butyryl)-pyrrolidine-2-carboxylic acid tert-butyl ester

(S)-2-{(S)-2-[(1R,2R)-1-Methoxy-2-((S)-2-phenyl-1-thiazol-2-yl-ethylcarbamoyl)-propyl]-pyrrolidine-1-carbonyl}-pyrrolidine-1-carboxylic acid 9H-fluoren-9-ylmethyl ester