Selective glutamate carboxypeptidase II (GCP II) inhibitor (IC50 = 90 nM). Selective for GCP II over NMDA, kainate and AMPA glutamate receptors and MMP-1, -2, -3, -7, -9, ACE and NEP metalloproteases. Antinociceptive in a rat model of neuropathic pain and protects against motor neuron death in familial amyotrophic lateral sclerosis mice. Orally bioavailable. MW (observed): 206.26.