4-Dehydro-phe-leu-enkephalin 91549-05-2 DHPLE Enkephalin-leu, dehydro-phe(4)- Enkephalin-leu, dehydrophenylalanine(4)- Leu-enkephalin, dehydro-phe(4)- Leucine-enkephalin, dehydro-phe(4)-