LY 379268 is a highly selective group II mGlu receptor agonist (EC50 values are 2.69 and 4.48 nM for hmGlu2 and hmGlu3 respectively) that displays > 80-fold selectivity over group I and group III receptors.
MPEP is a potent, highly selective non-competitive antagonist at the mGlu5a receptor subtype (IC50 = 36 nM) while having no agonist or antagonist activities at the mGlu1b receptor at concentrations up to 30 uM.
Ibotenic acid is a neuroexcitatory amino acid originally isolated from Amanita species that functions as a NMDA and metabotropic glutamate receptor agonist.
LY2812223 is a highly potent, functionally selective mGlu2 receptor agonist with mGlu2 binding affinity for mGlu2 and mGlu3 (Ki=144 nM and 156 nM, respectively).
NPS2390 is a group I mGlu antagonist. It displays noncompetitive antagonist activity at both mGlu1 and mGlu5 receptors. NPS2390 is thought to act on a site separate from the glutamate binding pocket.