[{"from": "human", "value": "What can you tell me about 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-1][C][=Branch1][C][=O][O-1][C][=Branch1][C][=O][O-1][C][=Branch1][C][=O][O-1][C][=Branch1][C][=O][O-1][C][=Branch1][C][=O][O-1]"}, {"from": "gpt", "value": "The molecule is the hexacarboxylate anion of mellitic acid. It is a conjugate base of a mellitic acid."}]