[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule appears as a colorless liquid. Insoluble in water and less dense than water. Vapors heavier than air. Inhalation of high concentrations may have a narcotic effect. Used to make other chemicals."}, {"from": "gpt", "value": "[C][C][=C][C][=C][C][=C][Ring1][#Branch1]"}]