[{"from": "human", "value": "Could you give me a brief overview of this molecule? [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]"}, {"from": "gpt", "value": "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."}]