2-Ala-4-Cl-phe-leu-enkephalin 2-Alanyl-4-chlorophenyalanyl-leucine enkephalin 77062-77-2 D-Leucine, L-tyrosyl-D-alanylglycyl-4-chloro-L-phenylalanyl- Enkephalin-leu, (ala(2)-Cl-phe(4))- LEACP Leu-enkephalin, ala(2)-Cl-phe(4)- Leucine enkephalin-2-alanyl-4-chlorophenylalanine