[{"from": "human", "value": "Generate a molecule based on this description. The molecule appears as a colorless liquid. Less dense than water. Vapors heavier than air. Vapors may be narcotic and irritating in high concentrations. Used as a solvent and to make perfumes."}, {"from": "gpt", "value": "[C][C][Branch1][C][C][C][O][C][=O]"}]