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Ketamine
Ketamine is a cyclohexanone-derived dissociative general anesthetic and NMDA receptor antagonist with analgesic and hallucinogenic properties, used medically for anesthesia, depression, and pain management. Ketamine exists as its two enantiomers, S- (esketamine) and R- (arketamine), and has antidepressant action likely involving NMDA antagonism as well as other mechanisms.
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