Article · Wikipedia archive · Last revised Jul 11, 2026

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.

Last revised
Jul 11, 2026
Read time
≈ 2 min
Length
364 w
Citations
8
Source
Wikipedia ↗
RH-34
Clinical data
Other namesEZS-8-NBOMe; NBOMe-EZS-8
Routes of
administration		?
ATC code
  • None
Legal status
Legal status
  • BR: Class F2 (Prohibited psychotropics)1
  • In general: uncontrolled
Identifiers
  • 3-[2-(2-methoxybenzylamino)ethyl]-1H-quinazoline-2,4-dione
CAS Number
PubChem CID
ChemSpider
UNII
CompTox Dashboard (EPA)
Chemical and physical data
FormulaC18H19N3O3
Molar mass325.368 g·mol−1
3D model (JSmol)
  • O=C1C=2C(NC(=O)N1CCNCC3=C(OC)C=CC=C3)=CC=CC2
  • 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) ☒N
  • Key:NUAJBITWGGTZCM-UHFFFAOYSA-N ☒N
 ☒NcheckY (what is this?)  (verify)

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.234

Interactions

Society and culture

RH-34 is a controlled substance in Hungary5 and Brazil.6 It is not a controlled substance in Canada as of 2025.7 It is also not an explicitly controlled substance in the United States.8

See also

See also

References

References

  1. Anvisa (2023-07-24). "RDC Nº 804 - Listas de Substâncias Entorpecentes, Psicotrópicas, Precursoras e Outras sob Controle Especial" [Collegiate Board Resolution No. 804 - Lists of Narcotic, Psychotropic, Precursor, and Other Substances under Special Control] (in Brazilian Portuguese). Diário Oficial da União (published 2023-07-25). Archived from the original on 2023-08-27. Retrieved 2023-08-27.
  2. Ralf Heim. Synthese und Pharmakologie potenter 5-HT2A-Rezeptoragonisten mit N-2-Methoxybenzyl-Partialstruktur. Entwicklung eines neuen Struktur-Wirkungskonzepts. (German)
  3. Maria Silva. Theoretical study of the interaction of agonists with the 5-HT2A receptor. Universität Regensburg, 2009.
  4. Silva ME, Heim R, Strasser A, Elz S, Dove S (January 2011). "Theoretical studies on the interaction of partial agonists with the 5-HT(2A) receptor". Journal of Computer-aided Molecular Design. 25 (1): 51–66. Bibcode:2011JCAMD..25...51S. CiteSeerX 10.1.1.688.2670. doi:10.1007/s10822-010-9400-2. PMID 21088982. S2CID 3103050.
  5. A Magyarországon megjelent, a Kábítószer és Kábítószer-függőség Európai Megfigyelő Központjának Korai Jelzőrendszerébe (EMCDDA EWS) 2005 óta bejelentett ellenőrzött anyagok büntetőjogi vonatkozású besorolása
  6. "Anvisa". Archived from the original on 2019-02-18. Retrieved 2019-02-18.
  7. "Controlled Drugs and Substances Act". Department of Justice Canada. Retrieved 19 January 2026.
  8. Orange Book: List of Controlled Substances and Regulated Chemicals (January 2026) (PDF), United States: U.S. Department of Justice: Drug Enforcement Administration (DEA): Diversion Control Division, January 2026