sb-200646 sb-200646 sb-200646 is a 5-ht2 receptor antagonist with anxiolytic properties in rats. it was the first 5-ht2 antagonist discovered to have selectivity of 5-ht2c/2b over 5-ht2a. sb-200646clinical dataatc codenonelegal statuslegal status un: unscheduled identifiers iupac name 1-(1-methyl-1h-indol-5-yl)-3-pyridin-3-ylurea cas number143797-63-1 ypubchem cid126769chemspider112592keggc11739chebichebi:8976chemblchembl85194comptox dashboard (epa)dtxsid40162550 chemical and physical dataformulac15h14n4omolar mass266.304 g·mol−13d model (jsmol)interactive image smiles cn1ccc2c1ccc(c2)nc(=o)nc3cccnc3 inchi inchi=1s/c15h14n4o/c1-19-8-6-11-9-12(4-5-14(11)19)17-15(20)18-13-3-2-7-16-10-13/h2-10h,1h3,(h2,17,18,20)key:ojzzjtlbyxhusj-uhfffaoysa-n