[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule appears as a clear colorless to yellow liquid with a pleasant odor. Flammable over a wide range of vapor-air concentrations. Flash point -31 \u00b0F. Less dense than water and insoluble in water. Vapors are heavier than air and narcotic in high concentrations. Produces toxic oxides of nitrogen during combustion."}, {"from": "gpt", "value": "[C][C][O][N][=O]"}]