Boc-Leu-Glu(OBut)-Gly-OH
Boc-Pro-Pro-Gln-Lys
(S)-2-((S)-4-Carbamoyl-2-{[(S)-1-((S)-pyrrolidine-2-carbonyl)-pyrrolidine-2-carbonyl]-amino}-butyrylamino)-6-(2-chloro-benzyloxycarbonylamino)-hexanoic acid methyl ester
Boc-Gln-Lys
H-Lys