[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule appears as a colorless volatile liquid with a strong odor. Denser than water. Contact may severely irritate skin, eyes and mucous membranes. May be toxic by ingestion. May also be combustible."}, {"from": "gpt", "value": "[C][=C][C][=C][Branch1][Branch1][C][=C][Ring1][=Branch1][C][C][=Branch1][C][=O][Cl]"}]