[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][=C][C][O]"}, {"from": "gpt", "value": "The molecule appears as a clear colorless liquid with a mustard-like odor. Flash point 70 \u00b0F. Very toxic by inhalation and ingestion. Less dense than water (7.1 lb / gal). Vapors are heavier than air. Prolonged exposure to low concentrations or short exposure to high concentrations may have adverse health effects from inhalation."}]