2-Gly-psi-(methyleneoxy)-3-gly-5-leu-enkephalinamide 98900-28-8 Enkephalinamide, gly(2)-psi-(methyleneoxy)-gly(3)-leu(5)- Enkephalinamide, glycyl(2)-psi-(methyleneoxy)-glycyl(3)-leucine(5)- Gly-(CH2O)-gly-leu-EK