[{"from": "human", "value": "Provide a brief overview of this molecule. [C][/C][=C][/C][=O]"}, {"from": "gpt", "value": "The molecule appears as a clear colorless to straw colored liquid with a penetrating pungent odor. Flash point 55 \u00b0F. Density 7.1 lb / gal. Very toxic by inhalation. May polymerize with the release of heat under exposure to heat or contamination. If polymerization takes place inside a container, the container may rupture violently. Less dense than water. Vapors heavier than air."}]