BAN ORL 24 is a potent and selective NOP receptor antagonist. (IC50 values are 0.27, 2500, 6700 and > 10000 nM for NOP, κ-, μ- and δ-receptors respectively). IC50 value: 0.27 nM Target: NOP receptor BAN ORL 24 inhibits nociceptin-induced stimulation of [35S]-GTPγS binding and Ca2+ mobilization in CHO cells in vitro. BAN ORL 24 antagonizes NOP agonist-induced reduction in locomotor activity in vivo. Brain penetrant.