Nα-acetyl-L-alanyl-L-alanyl-L-alanyl-L-lysine acetate

Nα-acetyl-L-alanyl-L-alanyl-L-alanyl-Nε-benzyloxycarbonyl-L-lysine 4-picolyl ester

L-2-acetamido-4-(3-pyridyl)butyryl-L-alanyl-L-alanyl-L-alanyl-Nε-benzyloxycarbonyl-L-lysine 4-picolyl ester

Boc-Ala-Ala-Lys(Z)-OPic

Boc-Ala-Ala-Ala-Lys(Z)-OPic