[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule appears as a clear colorless liquid with a petroleum-like odor. Flash point 25 \u00b0F. Less dense than water and insoluble in water. Vapors heavier than air."}, {"from": "gpt", "value": "[C][C][C][C][C][C][C][Ring1][=Branch1]"}]