AC-LEU-LEU-L-ARGININAL

n-acetyl-l-leucyl-l-leucyl-l-argininal

Ac-L-Leu-L-Leu-(1-Formyl-4-guanidinobutyl)-NH2

N-Acetyl-L-Leu-L-Leu-[4-[(aminoiminomethyl)amino]-1-formylbutyl]NH2