[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is an arenesulfonic acid that is phenol substituted by a sulfo group at C-4. It is functionally related to a phenol."}, {"from": "gpt", "value": "[C][=C][C][=Branch1][#Branch1][=C][C][=C][Ring1][=Branch1][O][S][=Branch1][C][=O][=Branch1][C][=O][O]"}]