[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule appears as a clear liquid. Less dense than water and slightly soluble in water. Vapors heavier than air. May be toxic by inhalation or skin absorption and irritating to skin. Used as a gasoline additive."}, {"from": "gpt", "value": "[C][C][C][C][O][C]"}]