117783-82-1 2-Ala-4-cyclopropyl-phe-leu-enkephalin methyl ester 2-Alanyl-4-cyclopropylphenylalanyl-leucine-enkephalin methyl ester CP-Ome-enkephalin Enkephalin-leu methyl ester, ala(2)-cyclopropyl-phe(4)- Leu-enkephalin methyl ester, ala(2)-cyclopropyl-phe(4)- Leucine-enkephalin methyl ester, alanyl(2)-cyclopropylphenylalanyl(4)-