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Systematic (IUPAC) name
Clinical data
Legal status
  • Temporary Class Drug (NZ), Illegal in the UK(2013) Schedule 1 in USA
CAS number 1199943-44-6 N
ATC code ?
PubChem CID 44626619
ChemSpider 24634882 N
Chemical data
Formula C21H29NO 
Mol. 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] Although a later study found its CB1 affinity to be much higher than previously expected, with a Ki of 28.9nM and an EC50 of 1295nM.[citation needed] 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).

History of use[edit]

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.[3] It has also been encountered in smoking blends and subsequently banned in Russia.[4]

The chemical UR-144 has also been banned in the UK in 2013 along with RCS-4 and AM-2201.[citation needed] This is due to two people in Glasgow being admitted to hospital after taking a legal high[clarification needed] with the chemicals in it.[citation needed] Another person was admitted to Brighton hospital[clarification needed] after overdosing on the drug.[citation needed]


A forensic standard of UR-144 is available, and the compound has been posted on the Forendex website of potential drugs of abuse.[5] 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 JM, Dart MJ, Tietje KR, Garrison TR, Grayson GK, Daza AV, El-Kouhen OF, Yao BB, Hsieh GC, Pai M, Zhu CZ, Chandran P, Meyer MD (January 2010). "Indol-3-ylcycloalkyl ketones: effects of N1 substituted indole side chain variations on CB(2) cannabinoid receptor activity". J. Med. Chem. 53 (1): 295–315. doi:10.1021/jm901214q. PMID 19921781. 
  3. ^ Temporary Class Drug Notices. New Zealand Ministry of Health
  4. ^ 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. doi:10.1002/dta.1418. PMID 23042760. 
  5. ^ Southern Association of Forensic Scientists http://forendex.southernforensic.org/index.php/detail/index/1218

Further reading[edit]