[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule appears as a clear colorless liquid. Burns, though may be difficult to ignite. Corrosive to tissue. Denser than water and insoluble in water. Vapors heavier than air. Used to make other chemicals."}, {"from": "gpt", "value": "[C][Branch1][Branch1][C][=C][C][Cl][Cl]"}]