61864-82-2 FNLLP L-Phenylalanine, N-(N-(N-formyl-L-norleucyl)-L-leucyl)- L-Phenylalanine, N-formyl-L-norleucyl-L-leucyl- N-Fnlp N-Formyl-nle-leu-p-phe N-Formyl-norleucyl-leucyl-p-phenylalanine N-Formylnorleucyl-leucyl-4-phenylalanine