[{"from": "human", "value": "Provide a description of this molecule. [C][C][=Branch1][C][=C][C][=Branch1][C][=O][O]"}, {"from": "gpt", "value": "The molecule appears as a clear colorless liquid (or low-melting solid) with a pungent odor. Corrosive to metals and tissue. Flash point 170 \u00b0F. Melting point 61 \u00b0F. May polymerize exothermically if heated or contaminated. If the polymerization takes place inside a container, the container may rupture violently. Less dense than water. Vapors heavier than air. Used to make plastics."}]