SR-144528 (192703-06-3) is a potent and selective antagonist of the cannabinoid CB2 receptor1,2.
1) Rinaldi-Carmona et al. (1998), SR-144528, the first potent and selective antagonist of the CB2 cannabinoid receptor; J. Pharmacol. Exp. Ther., 284 644
2) Portier et al. (1999), SR-144528, an antagonist for the peripheral cannabinoid receptor that behaves as an inverse agonist; J. Pharmacol. Exp. Ther., 288 582