deltorphin i deltorphin i deltorphin i, also known as deltorphin i or deltorphin c, is a naturally occurring, exogenous opioid heptapeptide and hence, exorphin, with the amino acid sequence tyr-d-ala-phe-asp-val-val-gly-nh2. while not known to be endogenous to humans or other mammals, deltorphin i, along with the other deltorphins and the dermorphins, is produced naturally in the skin of species of phyllomedusa, a genus of frogs native to south and central america. deltorphin possesses very high affinity and selectivity as an agonist for the δ-opioid receptor, and on account of its unusually high blood-brain-barrier penetration rate, produces centrally-mediated analgesic effects in animals even when administered peripherally. deltorphin i names iupac names (3s)-3-propanamido]-3-phenylpropanamido]-3--2-methylpropyl]carbamoyl}propanoic acidorl-tyrosyl-d-alanyl-l-phenylalanyl-l-α-aspartyl-l-valyl-l-valylglycinamide other names deltorphin i; deltorphin c identifiers cas number 122752-15-2 3d model (jsmol) interactive image chembl chembl317956 chemspider 8231517 pubchem cid 10055958 comptox dashboard (epa) dtxsid10153692 inchi inchi=1s/c37h52n8o10/c1-19(2)30(36(54)40-18-28(39)47)45-37(55)31(20(3)4)44-35(53)27(17-29(48)49)43-34(52)26(16-22-9-7-6-8-10-22)42-32(50)21(5)41-33(51)25(38)15-23-11-13-24(46)14-12-23/h6-14,19-21,25-27,30-31,46h,15-18,38h2,1-5h3,(h2,39,47)(h,40,54)(h,41,51)(h,42,50)(h,43,52)(h,44,53)(h,45,55)(h,48,49)/t21-,25+,26+,27+,30+,31+/m1/s1key: cjaorfippwigpg-qxyjmilxsa-ninchi=1/c37h52n8o10/c1-19(2)30(36(54)40-18-28(39)47)45-37(55)31(20(3)4)44-35(53)27(17-29(48)49)43-34(52)26(16-22-9-7-6-8-10-22)42-32(50)21(5)41-33(51)25(38)15-23-11-13-24(46)14-12-23/h6-14,19-21,25-27,30-31,46h,15-18,38h2,1-5h3,(h2,39,47)(h,40,54)(h,41,51)(h,42,50)(h,43,52)(h,44,53)(h,45,55)(h,48,49)/t21-,25+,26+,27+,30+,31+/m1/s1key: cjaorfippwigpg-qxyjmilxbs smiles o=c(n)cnc(=o)(nc(=o)(nc(=o)(nc(=o)(nc(=o)(nc(=o)(n)cc1ccc(o)cc1)c)cc2ccccc2)cc(=o)o)c(c)c)c(c)c properties chemical formula c37h52n8o10 molar mass 768.856 g/mol except where otherwise noted, data are given for materials in their standard state (at 25 °c , 100 kpa). infobox references