An α2-AR agonist; binds to α2-AR in calf cortex, rat kidney, and rat spleen (IC50s = 0.9, 4.3, and 4.2 nM, respectively); binds to α2-AR in rat cerebral cortex membrane, pig submandibular gland and lung tissue, and dog kidney membrane (Kds = 0.87, 5.28, 1.30, and 5.25 nM, respectively); inhibits noradrenaline-stimulated contraction in guinea pig ileum and rabbit vas deferens (EC50s = 7.59 and 6.76 nM, respectively)