[{"from": "human", "value": "Describe this molecule. [C][C][C][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule is a straight-chain saturated fatty acid that is butane in which one of the terminal methyl groups has been oxidised to a carboxy group. It has a role as a Mycoplasma genitalium metabolite and a human urinary metabolite. It is a straight-chain saturated fatty acid and a fatty acid 4:0. It is a conjugate acid of a butyrate."}]