Highly potent and selective group II metabotropic glutamate receptor antagonist (Ki/IC50 values are 2.3, 1.3, 173, 990, 6800, 8200 and 22000 nM for human mGlu2, mGlu3, mGlu8 , mGlu7a, mGlu1a, mGlu5a and mGlu4a receptors respectively). Readily brain penetrant and active in vivo. Disodium salt (Cat. No. 4062) also available. Also available as part of the Group II mGlu Receptor Tocriset™, Group III mGlu Receptor Tocriset™ and Mixed mGlu Receptor Tocriset™.