[{"from": "human", "value": "Provide a brief overview of this molecule. [C][C][=Branch1][C][=O][C][=C]"}, {"from": "gpt", "value": "The molecule appears as a clear colorless liquid with a pungent odor. Flash point 20 \u00b0F. May polymerize with the release of heat under exposure to heat or contamination. Less dense than water. Highly toxic by inhalation. Causes burns to skin, eyes and mucous membranes."}]