[{"from": "human", "value": "Use the given information to create a molecule that fulfills the desired purpose. The molecule appears as a colorless or yellow liquid with a pungent disagreeable odor. May be irritating to the eyes and mucous membranes; long-term exposure may result in adverse health effects. Vapors denser than air. Used to make other chemicals, plastics."}, {"from": "gpt", "value": "[C][C][C][Branch1][=Branch1][O][C][=C][Ring1][=Branch1][C][=O]"}]