[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a benzene-derived hexacarboxylic acid in which each carbon of benzene carries a carboxy substituent. It is a conjugate acid of a mellitic acid hexaanion."}, {"from": "gpt", "value": "[C][=Branch2][Ring2][O][=C][Branch2][Ring2][C][C][=Branch2][Ring1][=Branch2][=C][Branch1][P][C][=Branch1][=Branch2][=C][Ring1][=Branch1][C][=Branch1][C][=O][O][C][=Branch1][C][=O][O][C][=Branch1][C][=O][O][C][=Branch1][C][=O][O][C][=Branch1][C][=O][O][C][=Branch1][C][=O][O]"}]