[{"from": "human", "value": "What can you tell me about this molecule? [C][S][C][C][C][=Branch1][C][=O][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a 2-oxo monocarboxylic acid derived from L-methionine via the action of methionine transaminase. It is functionally related to a butyric acid and a L-methionine. It is a conjugate acid of a 4-methylthio-2-oxobutanoate."}]