[{"from": "human", "value": "Could you provide a description of this molecule? [C][O][C][=Branch1][C][=O][C][=C]"}, {"from": "gpt", "value": "The molecule is a colorless volatile liquid with an acrid odor. Flash point 27 \u00b0F. Vapors may irritate the eyes and respiratory system. Highly toxic by inhalation, ingestion and skin absorption. Less dense than water (0.957 gm / cm3) and slightly soluble in water, hence floats on water. Vapors heavier than air."}]