naltriben naltriben naltriben is a potent and selective antagonist for the delta opioid receptor, which is used in scientific research. it has similar effects to the more widely used δ antagonist naltrindole, but with different binding affinity for the δ1 and δ2 subtypes, which makes it useful for distinguishing the subtype selectivity of drugs acting at the δ receptors. it also acts as a κ-opioid agonist at high doses. naltribenclinical dataatc codenoneidentifierscas number111555-58-9 ypubchem cid5486827iuphar/bps1640chemspider4589081 yuniirxg719f189chemblchembl100940 ycomptox dashboard (epa)dtxsid80912218 chemical and physical dataformulac26h25no4molar mass415.489 g·mol−13d model (jsmol)interactive image smiles oc3c2o6c1oc8ccccc8c1c5(o)4n(cc56c2c(cc3)c4)cc7cc7 inchi inchi=1s/c26h25no4/c28-18-8-7-15-11-20-26(29)12-17-16-3-1-2-4-19(16)30-22(17)24-25(26,21(15)23(18)31-24)9-10-27(20)13-14-5-6-14/h1-4,7-8,14,20,24,28-29h,5-6,9-13h2/t20-,24+,25+,26-/m1/s1 ykey:zhvwweyetmpamx-ifkahutrsa-n y (verify)