XLR11 is a synthetic cannabinoid (CB) featuring a tetramethylcyclopropyl group, which reportedly confers selectivity for the peripheral CB₂ receptor over the central CB₁ receptor. It also features an N-(5-fluoropentyl) chain, which increases binding to both CB receptors. FUB-144 is a derivative of XLR11 in which the 5-fluoropentyl side chain is replaced by a 4-fluorobenzyl group, a functional group also found in the indazole-based synthetic cannabinoids AB-FUBINACA and ADB-FUBINACA. The physiological and toxicological properties of this compound are not known. This product is intended for forensic and research applications.