Selective non-competitive AMPA receptor antagonist (IC50 values are 10-20, ~ 450 and >> 50 μM for AMPA-, kainate- and NMDA-induced responses respectively). Skeletal muscle relaxant and orally-active anticonvulsant. Has anti-proliferative effects in transformed cells. Also available as part of the Kainate Receptor Tocriset?. Purity 98%. MW (observed): 366.24