[{"from": "human", "value": "Create a molecule with the structure as the one described. The molecule appears as a colorless liquid. Less dense than water and insoluble in water. Vapors heavier than air. May be mildly toxic by inhalation and ingestion. Used to make other chemicals."}, {"from": "gpt", "value": "[C][C][C][C][/C][=C][/C][=C]"}]