VU6005649 is a CNS penetrant mGlu7/8 receptor agonist with EC50s of 0.65 μM and 2.6 μM for mGlu7 receptor and mGlu8 receptor, respectively. References: Abe M, et al. Discovery of VU6005649, a CNS Penetrant mGlu7/8 Receptor PAM Derived from a Series of Pyrazolo[1,5-a]pyrimidines. ACS Med Chem Lett. 2017 Sep 1;8(10):1110-1115.