6,7-Arg-leu-enkephalin 77101-32-7 Aal-enk Enkephalin-leu, arg(6,7)- Enkephalin-leu, arginine(6,7)- L-Arginine, N2-(N2-(N-(N-(N-(N-L-tyrosylglycyl)glycyl)-L-phenylalanyl)-L-leucyl)-L-arginyl)- Leu-enkephalin, arg(6,7)- Leucine-enkephalin, arg(6,7)-