[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule appears as a clear colorless liquid. Flash point of 52 \u00b0F. Denser than water and insoluble in water. Hence sinks in water. Vapors heavier than air."}, {"from": "gpt", "value": "[C][C][=Branch1][C][=C][C][=Branch1][C][=O][C]"}]