SYM 2081 is a high-affinity ligand and potent, selective agonist of kainate receptors, inhibits [3H]-kainate binding with an IC50 of 35 nM, almost 3000- and 200-fold selectivity for kainate receptors over AMPA and NMDA receptors respectively[1].
References:
[1]. Lee JY, et al. Furthering pharmacological and physiological assessment of the glutamatergic receptors at the Drosophila neuromuscular junction. Comp Biochem Physiol C Toxicol Pharmacol. 2009 Nov;150(4):546-57.