SIB 1893 is an a highly selective non-competitive antagonist for the metabotropic glutamate mGlu5 receptor subtype; displays an IC50 value of 0.3 μM at hmGlu5, compared with > 100 μM at hmGlu1b, hmGlu2, hmGlu6, hmGlu7 and hmGlu8
Centrally active upon systemic administration in vivo