sb-699551 sb-699551 sb-699551 is a drug which was the first compound developed to act as a selective antagonist for the serotonin receptor 5-ht5a, with selectivity of around 100x over other serotonin receptor subtypes. multiple therapeutic roles have been suggested for 5-ht5a ligands due to the presence of this receptor in several areas of the brain, but research is still at an early stage, in animal studies, sb-699551 was found to block cue-mediated responding to lsd, again suggesting an antipsychotic type of activity. it also reduces the viability of certain types of cancer cells in vitro, suggesting the 5-ht5a receptor as a possible target for novel chemotherapy drugs. sb-699551identifiers iupac name 3-cyclopentyl-n--n-methyl)-4-biphenylyl)methyl]propanamide cas number791789-61-2 ypubchem cid11168182chemspider9343277unii3fn59x9dprcomptox dashboard (epa)dtxsid90457468 chemical and physical dataformulac34h45n3omolar mass511.754 g·mol−13d model (jsmol)interactive image smiles c2cccc2ccc(=o)n(ccn(c)c)cc(cc3)ccc3-c(cc1)ccc1cnccc4ccccc4 inchi inchi=1s/c34h45n3o/c1-36(2)24-25-37(34(38)21-16-28-10-6-7-11-28)27-31-14-19-33(20-15-31)32-17-12-30(13-18-32)26-35-23-22-29-8-4-3-5-9-29/h3-5,8-9,12-15,17-20,28,35h,6-7,10-11,16,21-27h2,1-2h3key:seqampxqrkyyqf-uhfffaoysa-n (verify)