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Clinical data
Routes of
ATC code
  • none
Legal status
Legal status
  • In General Unscheduled
  • [(7R)-3-Bromo-2,5-dimethoxy-bicyclo[4.2.0]octa-1,3,5-trien-7-yl]methanamine
CAS Number
PubChem CID
CompTox Dashboard (EPA)
Chemical and physical data
Molar mass272.142 g·mol−1
3D model (JSmol)
  • COc1c(Br)cc(OC)c2c1CC2CN
  • InChI=1S/C11H14BrNO2/c1-14-9-4-8(12)11(15-2)7-3-6(5-13)10(7)9/h4,6H,3,5,13H2,1-2H3/t6-/m0/s1

TCB-2 is a hallucinogen discovered in 2006 by Thomas McLean working in the lab of David Nichols at Purdue University.[1] It is a conformationally-restricted derivative of the phenethylamine 2C-B, also a hallucinogen, and acts as a potent agonist for the 5-HT2A and 5-HT2C receptors with a Ki of 0.26 nM at the human 5-HT2A receptor. In drug-substitution experiments in rats, TCB-2 was found to be of similar potency to both LSD and Bromo-DragonFLY, ranking it among the most potent phenethylamine hallucinogens yet discovered.[1] This high potency and selectivity has made TCB-2 useful for distinguishing 5-HT2A mediated responses from those produced by other similar receptors.[2] TCB-2 has similar but not identical effects in animals to related phenethylamine hallucinogens such as DOI, and has been used for studying how the function of the 5-HT2A receptor differs from that of other serotonin receptors in a number of animal models, such as studies of cocaine addiction and neuropathic pain.[3][4][5][6]

See also



  1. ^ a b McLean TH, Parrish JC, Braden MR, Marona-Lewicka D, Gallardo-Godoy A, Nichols DE (September 2006). "1-Aminomethylbenzocycloalkanes: conformationally restricted hallucinogenic phenethylamine analogues as functionally selective 5-HT2A receptor agonists". Journal of Medicinal Chemistry. 49 (19): 5794–803. CiteSeerX doi:10.1021/jm060656o. PMID 16970404.
  2. ^ Chang CW, Poteet E, Schetz JA, Gümüş ZH, Weinstein H (2009). "Towards a quantitative representation of the cell signaling mechanisms of hallucinogens: measurement and mathematical modeling of 5-HT1A and 5-HT2A receptor-mediated ERK1/2 activation". Neuropharmacology. 56 (Suppl 1): 213–25. doi:10.1016/j.neuropharm.2008.07.049. PMC 2635340. PMID 18762202.
  3. ^ Fox MA, French HT, LaPorte JL, Blackler AR, Murphy DL (September 2010). "The serotonin 5-HT(2A) receptor agonist TCB-2: a behavioral and neurophysiological analysis". Psychopharmacology. 212 (1): 13–23. doi:10.1007/s00213-009-1694-1. PMID 19823806. S2CID 22499760.
  4. ^ Aira Z, Buesa I, Salgueiro M, Bilbao J, Aguilera L, Zimmermann M, Azkue JJ (July 2010). "Subtype-specific changes in 5-HT receptor-mediated modulation of C fibre-evoked spinal field potentials are triggered by peripheral nerve injury". Neuroscience. 168 (3): 831–41. doi:10.1016/j.neuroscience.2010.04.032. PMID 20412834. S2CID 207248287.
  5. ^ Katsidoni V, Apazoglou K, Panagis G (February 2011). "Role of serotonin 5-HT2A and 5-HT2C receptors on brain stimulation reward and the reward-facilitating effect of cocaine". Psychopharmacology. 213 (2–3): 337–54. doi:10.1007/s00213-010-1887-7. PMID 20577718. S2CID 1580337.
  6. ^ Zhang G, Ásgeirsdóttir HN, Cohen SJ, Munchow AH, Barrera MP, Stackman RW (January 2013). "Stimulation of serotonin 2A receptors facilitates consolidation and extinction of fear memory in C57BL/6J mice". Neuropharmacology. 64 (1): 403–13. doi:10.1016/j.neuropharm.2012.06.007. PMC 3477617. PMID 22722027.