Potent inhibitor of glutamate carboxypeptidase II and III (GCP II and III/NAAG peptidase/NAALADase) (Ki values are 0.8 and 23 nM respectively) that inhibits the hydrolysis of NAAG (IC50 = 2.4 nM) . Does not directly interact with NMDA or metabotropic glutamate receptors. Reduces neuronal degeneration in a rat model of traumatic brain injury (TBI) and reduces locomotor activity in the PCP-model of schizophrenia.