[{"from": "human", "value": "Please give me some details about this molecule. [C][=Branch1][C][=O][=O]"}, {"from": "gpt", "value": "The molecule appears as a colorless odorless gas at atmospheric temperatures and pressures. Relatively nontoxic and noncombustible. Heavier than air and may asphyxiate by the displacement of air. Soluble in water. Forms carbonic acid, a mild acid. Under prolonged exposure to heat or fire the container may rupture violently and rocket. Used to freeze food, to control chemical reactions, and as a fire extinguishing agent."}]