A β3-adrenergic receptor agonist (EC50 = 22.4 nM) that displays potent selectivity for β3 compared to the β1 and β2 receptor subtypes (EC50s ≥ 10 µM); relaxes rat and human bladder strips precontracted with carbamoylcholine (EC50s = 5.1 and 0.78 µM, respectively).