Potent CB1 receptor antagonist (IC50 = 8 nM, Ki = 7.49 nM) that displays 306-fold selectivity over CB2 receptors. Also potent GPR55 agonist (EC50 = 39 nM). Also available as part of the Cannabinoid CB1 Receptor Tocriset™; and in a fluorescent form (Cat. No. 2540).