[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is the S- (more active) enantiomer of ketamine. It has a role as an analgesic, a NMDA receptor antagonist and an intravenous anaesthetic. It is an enantiomer of a (R)-ketamine."}, {"from": "gpt", "value": "[C][N][C@@][Branch1][=Branch2][C][C][C][C][C][Ring1][=Branch1][=O][C][=C][C][=C][C][=C][Ring1][=Branch1][Cl]"}]