[{"from": "human", "value": "Generate a molecule based on the given description. The molecule is a colorless nonflammable gas. It is shipped as a liquid under pressure. It may be narcotic at high concentrations. Under prolonged exposure to fire or heat the containers may rupture violently and rocket. It is used as a refrigerant."}, {"from": "gpt", "value": "[C][Branch1][C][F][Branch1][C][F][Branch1][C][F][F]"}]