Highly potent and selective inhibitor of glutamate carboxypeptidase 2 (GCP II/N-acetylated α-linked dipeptidase/NAALADase) with a Ki value of 275 pM. Neuroprotective; protects against glutamate-mediated motor neuron degeneration and reduces volume of injury following middle cerebral artery occlusion (MCAO). MW (observed): 226.12.