|Chemical and physical data|
|Molar mass||329.46 g·mol−1|
|3D model (JSmol)|
XLR-11 (5"-fluoro-UR-144) is a drug that acts as a potent agonist for the cannabinoid receptors CB1 and CB2 with EC50 values of 98 nM and 83 nM, respectively. It is a 3-(tetramethylcyclopropylmethanoyl)indole derivative related to compounds such as UR-144, A-796,260 and A-834,735, but it is not specifically listed in the patent or scientific literature alongside these other similar compounds, and appears to have not previously been made by Abbott Laboratories, despite falling within the claims of patent WO 2006/069196. XLR-11 was found to produce rapid, short-lived hypothermic effects in rats at doses of 3 mg/kg and 10 mg/kg, suggesting that it is of comparable potency to APICA and STS-135.
A forensic standard for this compound is available, and a representative mass spectrum has been posted on Forendex.
XLR-11 was instead first identified by laboratories in 2012 as an ingredient in synthetic cannabis smoking blends, and appears to be a novel compound invented specifically for grey-market recreational use.
The U.S. Drug Enforcement Administration (DEA) made the synthetic cannabinoids UR-144, XLR11, and AKB48 Schedule I, illegal drugs under the Controlled Substances Act (CSA) for the next two years as of 16 May 2013.
It has also been banned in Florida as of December 11, 2012.
Arizona banned XLR-11 on 3 April 2013.
As of October 2015 XLR-11 is a controlled substance in China.
XLR-11 is banned in the Czech Republic.
XLR-11 has been linked to hospitalizations due to its use.
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