Potent and selective nociceptin opioid receptor (NOP) agonist (EC50 values are 12, 693, 683 and 8071 nM, and Ki values are 0.3, 65, 131 and 2854 nM at NOP, μ-, κ- and δ-opioid receptors respectively). Exhibits anxiolytic-like activity at doses that have no effect on overt behaviors such as locomotion in vivo. Orally active.