[{"from": "human", "value": "Design a molecule that meets the criteria outlined in the description. The molecule appears as a colorless to pale-yellow colored liquid with a pungent odor. Insoluble in water. Slightly denser than water. Contact may irritate skin, eyes, and mucous membranes. May be toxic by ingestion. Used to make other chemicals."}, {"from": "gpt", "value": "[C][C][=C][C][=C][C][=C][Ring1][=Branch1][C][Cl]"}]