2-Ala-5-N-Et-leu-enkephalinamide 67787-85-3 BW 831C BW-831C Enkephalinamide-leu, ala(2)-N-Et(5)- L-Tyrosyl-D-alanylglycyl-L-phenylalanyl-N-ethyl-D-leucinamide Leu-enkephalinamide, ala(2)-N-Et(5)- Tyr-ala-gly-phe-N-Et-leu Tyrosyl-alanylglycyl-phenylalanyl-N-ethyl-leucinamide