[{"from": "human", "value": "Provide a description of this molecule. [C][O][C][=Branch1][C][=O][C][Br]"}, {"from": "gpt", "value": "The molecule appears as a colorless to straw-colored liquid with a sharp penetrating odor. Denser than water and soluble in water. Severly irritates skin and eyes. Toxic by ingestion and inhalation. Used to make vitamins and pharmaceuticals."}]