Positive allosteric modulator of neuropeptide Y receptor 4 (Y4R). Potentiates Y4R response to pancreatic polypeptide (PP), neuropeptide Y (NPY) and peptide YY (PYY) (EC50 values are 0.03, 0.4 and 0.5 nM respectively). Shows selectivity for Y4R over Y1R, Y2R and Y5R.