fananserin fananserin fananserin (rp-62203) is a drug which acts as a potent antagonist at both the 5ht2a receptor, and the dopamine d4 receptor, but without blocking other dopamine receptors such as d2. it has sedative and antipsychotic effects, and has been researched for the treatment of schizophrenia, although efficacy was less than expected and results were disappointing. fananserinclinical dataother namesfananserinatc codenoneidentifiers iupac name 2-(3-(4-(p-fluorophenyl)-1-piperazinyl)propyl)-2h-naphth(1,8-cd)isothiazole 1,1-dioxide cas number127625-29-0 ypubchem cid60785iuphar/bps5434chemspider54781 nunii38qj762et6keggd02656 ycomptox dashboard (epa)dtxsid8046743 chemical and physical dataformulac23h24fn3o2smolar mass425.52 g·mol−13d model (jsmol)interactive image smiles c1cn(ccn1cccn2c3=cc=cc4=c3c(=cc=c4)s2(=o)=o)c5=cc=c(c=c5)f inchi inchi=1s/c23h24fn3o2s/c24-19-8-10-20(11-9-19)26-16-14-25(15-17-26)12-3-13-27-21-6-1-4-18-5-2-7-22(23(18)21)30(27,28)29/h1-2,4-11h,3,12-17h2 nkey:vgighgmpmucliq-uhfffaoysa-n n ny (what is this?) (verify)