rh-34 rh-34 rh-34 is a compound which acts as a potent and selective partial agonist for the 5-ht2a serotonin receptor subtype. it was derived by structural modification of the selective 5-ht2a antagonist ketanserin, with the 4-(p-fluorobenzoyl)piperidine moiety replaced by the n-(2-methoxybenzyl) pharmacophore found in such potent 5-ht2a agonists as nbome-2c-b and nbome-2c-i. this alteration was found to retain 5-ht2a affinity and selectivity, but reversed activity from an antagonist to a moderate efficacy partial agonist. rh-34clinical dataroutes ofadministration?atc codenonelegal statuslegal status in general: uncontrolled identifiers iupac name 3--1h-quinazoline-2,4-dione cas number1028307-48-3 npubchem cid10041987chemspider8217551 nuniia31aed225ocomptox dashboard (epa)dtxsid80434687 chemical and physical dataformulac18h19n3o3molar mass325.368 g·mol−13d model (jsmol)interactive image smiles o=c1c=2c(nc(=o)n1ccncc3=c(oc)c=cc=c3)=cc=cc2 inchi inchi=1s/c18h19n3o3/c1-24-16-9-5-2-6-13(16)12-19-10-11-21-17(22)14-7-3-4-8-15(14)20-18(21)23/h2-9,19h,10-12h2,1h3,(h,20,23) nkey:nuajbitwggtzcm-uhfffaoysa-n n ny (what is this?) (verify) legal status rh-34 is a controlled substance in hungary and brazil.