sr-16435 sr-16435 sr-16435 is a drug which acts as a potent partial agonist at both the μ-opioid receptor and nociceptin receptor. in animal studies it was found to be a potent analgesic, with results suggestive of reduced development of tolerance and increased activity against neuropathic pain compared to classic μ-selective agonists. sr-16435identifiers iupac name 1-nonanyl)piperidin-4-yl]-3h-indol-2-one cas number857262-16-9pubchem cid11461888chemical and physical dataformulac22h30n2omolar mass338.495 g·mol−13d model (jsmol)interactive image smiles c1cc2cccc(c1)c2n3ccc(cc3)n4c(=o)cc5=cc=cc=c54 inchi inchi=1s/c22h30n2o/c25-21-15-18-5-1-2-10-20(18)24(21)19-11-13-23(14-12-19)22-16-6-3-7-17(22)9-4-8-16/h1-2,5,10,16-17,19,22h,3-4,6-9,11-15h2key:xvfxjqgbdpfcrf-uhfffaoysa-n