Potent, positive allosteric modulator/allosteric agonist at mGlu4 receptors (EC50 = 798 and 693 nM at human and rat mGlu4 receptors respectively). Active in in vivo models of Parkinson's disease following i.c.v. administration. Also available as sodium salt (Cat. No. 3311 ). Purity 99%. MW (observed): 316.18