Selective, non-peptide competitive NPY Y5 antagonist. Ki values are 8.0 and 16032 nM at human recombinant Y5 and Y1 receptors respectively. Potently antagonizes NPY inhibition of forskolin-stimulated cAMP. Displays some affinity for cloned human D2 and α2C receptors (Ki values are 63 and 100 nM respectively).