(S)-1-[(S)-4-Methyl-2-((S)-3-methyl-2-{(S)-3-phenyl-2-[((S)-pyrrolidine-2-carbonyl)-amino]-propionylamino}-butyrylamino)-pentanoyl]-pyrrolidine-2-carboxylic acid tert-butyl ester

N-Fmoc-L-Val-L-Asn-L-Pro-L-Phe-L-Val-L-Leu-L-Pro-O-(t-Bu)

(S)-1-{(S)-2-[((2R,3R)-3-Carboxy-oxiranecarbonyl)-amino]-4-methyl-pentanoyl}-pyrrolidine-2-carboxylic acid tert-butyl ester

Z-Ile-Leu-Pro-Gln-Ser-Leu-Pro-OBut

Z-Gln-Ser-Leu-Pro-OBut