[{"from": "human", "value": "Describe this molecule. [Br]"}, {"from": "gpt", "value": "The molecule appears as a colorless gas with a pungent irritating odor. Corrosive. Heavier than air. Prolonged exposure to fire or intense heat may result in the violent rupture and rocketing of the container. Long-term exposure to low concentrations or short-term exposure to high concentrations can result in adverse health effects from inhalation. Used to make other chemicals and as a catalyst in the manufacture of chemicals.   Rate of onset: Immediate  Persistence: Minutes to hours  Odor threshold: 2 ppm  Source/use/other hazard: Chemical manufacturing industry; very corrosive."}]