dpdpe dpdpe dpdpe (enkephalin) is a synthetic opioid peptide and a selective agonist of the δ-opioid receptor (dor) which is used in scientific research. it was developed in the early 1980s and was the first highly selective agonist of the dor to be developed. it was derived from structural modification of met-enkephalin. dpdpeclinical dataother namesl-tyrosyl-d-penicillamyl-glycyl-l-phenylalanyl-d-penicillamine (2->5)-disulfide; h-tyr-d-pen(1)-gly-phe-d-pen(1)-ohidentifiers iupac name (4s,7s,13s)-13-amino]-7-benzyl-3,3,14,14-tetramethyl-6,9,12-trioxo-1,2-dithia-5,8,11-triazacyclotetradecane-4-carboxylic acid cas number88373-73-3pubchem cid104787chemspider94592chebichebi:73356chemblchembl31421comptox dashboard (epa)dtxsid201008102 chemical and physical dataformulac30h39n5o7s2molar mass645.79 g·mol−13d model (jsmol)interactive image smiles cc1((c(=o)ncc(=o)n(c(=o)n(c(ss1)(c)c)c(=o)o)cc2=cc=cc=c2)nc(=o)(cc3=cc=c(c=c3)o)n)c inchi inchi=1s/c30h39n5o7s2/c1-29(2)23(34-25(38)20(31)14-18-10-12-19(36)13-11-18)27(40)32-16-22(37)33-21(15-17-8-6-5-7-9-17)26(39)35-24(28(41)42)30(3,4)44-43-29/h5-13,20-21,23-24,36h,14-16,31h2,1-4h3,(h,32,40)(h,33,37)(h,34,38)(h,35,39)(h,41,42)/t20-,21-,23-,24-/m0/s1key:mcmmcrypqbncph-wmimktlmsa-n