sb-216641 sb-216641 sb-216641 is a drug which is a selective antagonist for the serotonin receptor 5-ht1b, with around 25x selectivity over the closely related 5-ht1d receptor. it is used in scientific research, and has demonstrated anxiolytic effects in animal studies. sb-216641clinical dataatc codenoneidentifiers iupac name n--4-methoxyphenyl]-2'-methyl-4'-(5-methyl-1,2,4-oxadiazol-3-yl)--4-carboxamide cas number170230-39-4 ypubchem cid3292447iuphar/bps28chemspider2541153uniizm4360761ccomptox dashboard (epa)dtxsid4043985 chemical and physical dataformulac28h30n4o4molar mass486.572 g·mol−13d model (jsmol)interactive image smiles cn(c)ccoc1cc(ccc1oc)nc(=o)c3ccc(cc3)-c2ccc(cc2c)-c4noc(c)n4 inchi inchi=1s/c28h30n4o4/c1-18-16-22(27-29-19(2)36-31-27)10-12-24(18)20-6-8-21(9-7-20)28(33)30-23-11-13-25(34-5)26(17-23)35-15-14-32(3)4/h6-13,16-17h,14-15h2,1-5h3,(h,30,33)key:jrnukvfyilmmlx-uhfffaoysa-n (verify)