GM-2040 is a putatively non-hallucinogenic serotonin 5-HT2A receptor agonist which was developed by Gilgamesh Pharmaceuticals. It is a partial agonist of the serotonin 5-HT2A receptor, with a Ki of 3.4nM, an EC50 of 43.8nM, and an Emax of 71.1%.
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