[{"from": "human", "value": "Based on the given information, design a molecule that meets the desired specifications. The molecule appears as a colorless gas with a pungent odor. Very toxic by inhalation. Prolonged exposure of the containers to fire or heat may result in violent rupturing and rocketing."}, {"from": "gpt", "value": "[C][=Branch1][C][=O][Branch1][C][F][F]"}]