2-Ala-5-pronh2-enkephalin 66864-07-1 Enkephalin, ala(2)-pronh2(5)- Enkephalin, alanyl(2)-prolinamide(5)- Enkephalinamide, ala(2)-pro(5)- L-Prolinamide, L-tyrosyl-D-alanylglycyl-L-phenylalanyl- Wy 42,186