[{"from": "human", "value": "Describe this molecule. [C][=C][C][=Branch1][C][=C][Cl]"}, {"from": "gpt", "value": "The molecule appears as a clear colorless liquid. Flash point -4 \u00b0F. May polymerize exothermically if heated or contaminated. If polymerization takes place inside a container, the container may rupture violently. Less dense than water. Vapors heavier than air. Used to make neoprene rubber."}]