Potent and selective TRPV1 antagonist. Blocks Ca2+ uptake by CHO cells expressing TRPV1 receptors and acid-induced Ca2+ uptake, respectively). Exhibits >4000-fold selectivity for TRPV1 over other TRP channels. Blocks capsaicin-induced flinch response and causes hyperthermia in rats. Orally available and non-CNS penetrant.