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Systematic (IUPAC) name
Clinical data
Trade names different brandnames, typical example: "TMCP-018", "KM-X1", "UR-144", "MN-001", "YX-17"
Legal status
CAS Number 1199943-44-6 N
PubChem CID: 44626619
ChemSpider 24634882 N
Chemical data
Formula C21H29NO
Molecular mass 311.461 g/mol
 N (what is this?)

UR-144 (TMCP-018, KM-X1, MN-001, YX-17) is a drug invented by Abbott Laboratories,[1] that acts as a selective full agonist of the peripheral cannabinoid receptor CB2, but with much lower affinity for the psychoactive CB1 receptor.


UR-144 has high affinity for the CB2 receptor with a Ki of 1.8 nM but 83x lower affinity for the CB1 receptor with a Ki of 150 nM.[2] UR-144 was found to possess an EC50 of 421 nM for human CB1 receptors, and 72 nM for human CB2 receptors.[3] UR-144 produces bradycardia and hypothermia in rats at a dose of 10 mg/kg, suggesting weak cannabinoid-like activity.[3]

Chemically it is closely related to other 2,2,3,3-tetramethylcyclopropyl synthetic cannabinoids like A-796,260 and A-834,735 but with a different substitution on the 1-position of the indole core, in these compounds its 1-pentyl group is replaced with alkylheterocycles like 1-(2-morpholinoethyl) and 1-(tetrahydropyran-4-ylmethyl).


The UK ACMD recommended that generic prohibition legislation be extended to include UR-144 in October 2012.[4] The UK Home Office accepted the recommendation and enacted legislation to ban UR-144 as a class B drug along with a number of other drugs on February 26, 2013 as a part of The Misuse of Drugs Act 1971 (Amendment) Order 2013.

UR-144 has been detected as an ingredient of synthetic cannabis smoking blends in New Zealand, and subsequently banned from sale as a temporary class drug on 6 April 2012.[5] It has also been encountered in smoking blends and subsequently banned in Russia.[6]

As of October 2015 UR-144 is a controlled substance in China.[7]


A forensic standard of UR-144 is available, and the compound has been posted on the Forendex website of potential drugs of abuse.[8] An ELISA immunoassay technique for detecting UR-144 in urine as part of general drug screens has been developed by Tulip Biolabs, Inc. An Homogeneous Immunoassay that runs on most Clinical Chemistry Analyzers and detects several UR and XLR synthetic cannabinoids has been developed and introduced by Immunalysis Inc. Pomona USA.

See also[edit]


  1. ^ WO application 2006069196, Pace JM, Tietje K, Dart MJ, Meyer MD, "3-Cycloalkylcarbonyl indoles as cannabinoid receptor ligands", published 2006-06-29, assigned to Abbott Laboratories 
  2. ^ Frost, J. M.; et al. (2010). "Indol-3-ylcycloalkyl Ketones: Effects of N1 Substituted Indole Side Chain Variations on CB2 Cannabinoid Receptor Activity". Journal of Medicinal Chemistry 53 (1): 295–315. doi:10.1021/jm901214q. PMID 19921781. 
  3. ^ a b Banister, S. D.; Stuart, J.; Kevin, R. C.; Edington, A.; Longworth, M.; Wilkinson, S. M.; Beinat, C.; Buchanan, A. S.; Hibbs, D. E.; Glass, M.; Connor, M.; McGregor, I. S.; Kassiou, M. (2015). "Effects of Bioisosteric Fluorine in Synthetic Cannabinoid Designer Drugs JWH-018, AM-2201, UR-144, XLR-11, PB-22, 5F-PB-22, APICA, and STS-135". ACS Chemical Neuroscience: 150508124201002. doi:10.1021/acschemneuro.5b00107. 
  4. ^ "Further consideration of the synthetic cannabinoids". UK Advisory Council on the Misuse of Drugs. 18 October 2012. p. 14. Retrieved 13 December 2014. 
  5. ^ Temporary Class Drug Notices. New Zealand Ministry of Health
  6. ^ Sobolevsky T, Prasolov I, Rodchenkov G (October 2012). "Detection of urinary metabolites of AM-2201 and UR-144, two novel synthetic cannabinoids". Drug Test Anal 4: 745–753. doi:10.1002/dta.1418. PMID 23042760. 
  7. ^ "关于印发《非药用类麻醉药品和精神药品列管办法》的通知" (in Chinese). China Food and Drug Administration. 27 September 2015. Retrieved 1 October 2015. 
  8. ^ Southern Association of Forensic Scientists http://forendex.southernforensic.org/index.php/detail/index/1218

Further reading[edit]