2-Alanyl-methionine sulfoxide enkephalinamide 70021-29-3 Butanamide, L-tyrosyl-D-alanylglycyl-L-phenylalanyl-gamma-(methylsulfinyl)-L-alpha-amino- Dala sulfoxide Enkephalinamide-met sulfoxide, ala(2)- Met-sulfoxide-enkephalinamide-ala(2) Methionine sulfoxide enkephalinamide-2-alanine