DCG-IV is an effective agonist of class II mGluR. DCG-IV has anticonvulsant and neuroprotective effects. The EC50 of mGlu2R and mGlu3R are 0.35 and 0.09 μM, respectively. DCG-IV is also a competitive antagonist of Group I (IC50: mGlu1 / 5R = 389/630 μM) a
(RS)-PPG is a potent and selective group III mGluRs agonist(EC50s of 5.2 μM, 4.7 μM, 185 μM, and 0.2 μM for hmGluR4a, hmGluR6, hmGluR7b, and hmGluR8a, respectively),with neuroprotective and anticonvulsive activity.