[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule is the diethyl ester of dicarbonic acid. It is functionally related to a dicarbonic acid."}, {"from": "gpt", "value": "[C][C][O][C][=Branch1][C][=O][O][C][=Branch1][C][=O][O][C][C]"}]