6-Arg-7-phe-leu-enkephalin 79358-92-2 Enkephalin-leu, arg(6)-phe(7)- Enkephalin-leu,arginyl(6)-phenylalanine(7)- LEAPA Leu-enkephalin, arg(6)-phe(7)- Leucine-enkephalin, arg(6)-phe(7)- alpha-Neoendorphin, 7-L-phenylalanine-8-de-L-tyrosine-9-de-L-proline-10-de-L-lysine-