[{"from": "human", "value": "Generate a molecule based on the given description. The molecule appears as a water-white to straw colored liquid. Slightly less dense than water and insoluble in water. Vapors may be toxic. Used in making rubber."}, {"from": "gpt", "value": "[C][=C][C][=C][C][=C][C][=C][Ring1][=Branch1][C][=C]"}]