[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule is a phthalic acid monoester resulting from the condensation of one of the carboxy groups of phthalic acid with ethanol. It has a role as a metabolite. It is an ethyl ester and a phthalic acid monoester."}, {"from": "gpt", "value": "[C][C][O][C][=Branch1][C][=O][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=Branch1][C][=O][O]"}]