[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule appears as colorless fuming liquid with a pungent odor. Very toxic by inhalation, ingestion or skin absorption. Fumes irritate the eyes and mucous membranes. Corrosive to most metals and tissue."}, {"from": "gpt", "value": "[C][C][Branch1][C][C][Branch1][C][C][C][=Branch1][C][=O][Cl]"}]