CPD-1 (LS-193743) is a drug with a benzofuranyl piperazine structure, which acts as a potent and selective agonist for the 5-HT<sub>2</sub> receptor family, with highest affinity and full agonist efficacy at the 5-HT<sub>2C</sub> subtype, and lower affinity and partial agonist action at the 5-HT<sub>2A</sub> and 5-HT<sub>2B</sub> subtypes.