[{"from": "human", "value": "Create a molecule that satisfies the conditions outlined in the description. The molecule appears as a yellow oily liquid with a pleasant odor. A mixture of isomers (n-butyl, sec-butyl and tert-butyl). Slightly soluble in water. Slightly less dense than water. Vapors are much heavier than air. Toxic by ingestion, mildly toxic by inhalation. Used to make fuel for jet airplanes."}, {"from": "gpt", "value": "[C][C][C][C][O][N][=O]"}]