(S)-2-((S)-2-{(S)-2-[(S)-2-Amino-6-(4-methoxy-2,3,6-trimethyl-benzenesulfonylamino)-hexanoylamino]-propionylamino}-4-methyl-pentanoylamino)-propionic acid tert-butyl ester

Z-Lys(Mtr)-Ala-Leu-Ala-OtBu

Z-Leu-Ala-OBut

Z-Leu-Lys(Mtr)-Ala-Leu-Ala-OtBu

H-L-Leu-L-Ala-OtBu