[{"from": "human", "value": "Describe this molecule. [C][C][O][C][=Branch1][C][=O][C][=C]"}, {"from": "gpt", "value": "The molecule appears as a clear colorless liquid with an acrid odor. Flash point 60 \u00b0F. May polymerize exothermically if heated or contaminated. If the polymerization takes place inside a container, the container may rupture violently. Auto ignition temperature 721 \u00b0F (383 \u00b0C) (NTP). Less dense than water. Vapors heavier than air. Used to make paints and plastics."}]