[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is the fatty acid methyl ester of isobutyric acid. It has a role as a metabolite. It is functionally related to an isobutyric acid."}, {"from": "gpt", "value": "[C][C][Branch1][C][C][C][=Branch1][C][=O][O][C]"}]