[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule appears as an odorless, white solid. Can cause damaging frostbite. Noncombustible and nontoxic. Liquefies at -109 \u00b0F. Can asphyxiate by displacement of air. Used as a refrigerant."}, {"from": "gpt", "value": "[C][=Branch1][C][=O][=O]"}]