[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule is a 3-oxo monocarboxylic acid that is valeric acid substituted by a methyl group at position 2 and a keto group at position 3. It has a role as a human metabolite. It is functionally related to a valeric acid."}, {"from": "gpt", "value": "[C][C][C][=Branch1][C][=O][C][Branch1][C][C][C][=Branch1][C][=O][O]"}]