6,7-Arg-8-valnh2-met-enkephalin 88377-68-8 Enkephalin-met, arg(6,7)-valnh2(8)- Enkephalin-met, arginyl(6,7)-valinamide(8)- Met-enkephalin, arg(6,7)-valnh2(8)- Methionine-enkephalin, arg(6,7)-valnh2(8)- Metorphamide adrenorphin