ChEBI: Ketamine is a member of the class of cyclohexanones in which one of the hydrogens at position 2 is substituted by a 2-chlorophenyl group, while the other is substituted by a methylamino group. It has a role as an intravenous anaesthetic, a NMDA receptor antagonist, an analgesic, a neurotoxin, an environmental contaminant and a xenobiotic. It is a member of cyclohexanones, a secondary amino compound and a member of monochlorobenzenes.