[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule is a dialkyl ketone that is a four-carbon ketone carrying a single keto- group at position C-2. It has a role as a polar aprotic solvent and a bacterial metabolite. It is a dialkyl ketone, a methyl ketone, a volatile organic compound and a butanone."}, {"from": "gpt", "value": "[C][C][C][=Branch1][C][=O][C]"}]