2-Alanyl-N-pentyl-4-phenylalaninamide enkephalin 66229-24-1 Enkephalin, 2-alanyl-N-pentyl-4-phenylalaninamide Enkephalin, ala(2)-N-pentyl-phenh(4)- Enkephalin, ala(2)-decarboxy-nle(5)- L-Phenylalaninamide, L-tyrosyl-D-alanylglycyl-N-pentyl-