[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule is a pentacarboxylic acid anion. It is a conjugate base of a pentetic acid. It is a conjugate acid of a pentetate(2-)."}, {"from": "gpt", "value": "[C][Branch1][P][C][N][Branch1][#Branch1][C][C][=Branch1][C][=O][O][C][C][=Branch1][C][=O][O][N][Branch2][Ring1][C][C][C][N][Branch1][#Branch1][C][C][=Branch1][C][=O][O][C][C][=Branch1][C][=O][O][C][C][=Branch1][C][=O][O-1]"}]