[{"from": "human", "value": "Provide a description of this molecule. [C][=C][C][=Branch1][C][=O][O][C][C][O]"}, {"from": "gpt", "value": "The molecule appears as a clear colorless liquid. Less dense than water. Vapors heavier than air. Corrosive to tissue. May polymerize exothermically if heated or contaminated. If the polymerization takes place inside a container, the container may rupture violently. Used to make plastics."}]