[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule appears as a colorless liquid with a penetrating, irritating odor. Denser than water. Contact may irritate skin, eyes and mucous membranes. Toxic by ingestion, inhalation and skin absorption. Used to make other chemicals."}, {"from": "gpt", "value": "[C][Branch1][#Branch1][O][C][=Branch1][C][=O][Cl][Cl]"}]