Potent and selective glycine transporter 1 (GlyT1) inhibitor (IC50 values are 15.8 and > 30 000 nM at GlyT1 and GlyT2 respectively). Induces a dose-dependent elevation in CSF levels of glycine, and enhances acetylcholine and dopamine release in the striatum and prefrontal cortex respectively. Produces profound locomotor and respiratory impairments at higher doses. Purity 98%. MW (observed): 421.91