[{"from": "human", "value": "Generate a molecule based on this description. The molecule is a pyrandicarboxylic acid. It is a conjugate acid of a 2-oxo-2H-pyran-4,6-dicarboxylate."}, {"from": "gpt", "value": "[C][=C][Branch1][#C][C][=C][Branch1][=Branch1][O][C][Ring1][=Branch1][=O][C][=Branch1][C][=O][O][C][=Branch1][C][=O][O]"}]