[{"from": "human", "value": "Describe this molecule. [C][C][=Branch1][C][=O][Br]"}, {"from": "gpt", "value": "The molecule appears as a colorless fuming liquid with a pungent odor. Vapors irritate eyes and mucous membranes. Corrosive to metals and tissue. Density 13.9 lb / gal."}]