[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a Serotonin-3 Receptor Antagonist. The mechanism of action of ondansetron is as a Serotonin 3 Receptor Antagonist."}, {"from": "gpt", "value": "[C][C][=N][C][=C][N][Ring1][Branch1][C][C][C][C][C][=C][Branch1][Branch1][C][Ring1][=Branch1][=O][C][=C][C][=C][C][=C][Ring1][=Branch1][N][Ring1][O][C]"}]