BMS-193885 is a potent, selective, competitive, and brain penetrant neuropeptide Y1 receptor antagonist with a Ki of 3.3 nM, and has an IC50 of 5.9 nM for hY1, which displays > 100, > 160, > 160 and > 160-fold selectivity over α1, hY2, hY4 and hY5 receptors, respectively .