2-Ala-cystamine-dimer-leu-enkephalin 99043-48-8 CELAD Enkephalin-leu, ala(2)-cystamine-dimer- Enkephalin-leu, alanine(2)-cystamine-dimer- Leu-enkephalin, ala(2)-cystamine dimer- Leucine-enkephalin, ala(2)-cystamine-dimer-