[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule appears as a clear, colorless liquid with a pleasant odor. Denser than water and slightly soluble in water. Vapors are heavier than air. Used to make other chemicals and as a special purpose solvent."}, {"from": "gpt", "value": "[C][O][C][=Branch1][C][=O][O][C]"}]