[{"from": "human", "value": "Synthesize a molecule that matches the given characteristics. The molecule appears as a white to light-colored crystalline solid. Insoluble in water and denser than water. Contact may cause irritation to skin, eyes, and mucous membranes. May be toxic by ingestion. Used to make other chemicals."}, {"from": "gpt", "value": "[C][=C][C][=Branch1][S][=C][Branch1][Branch2][C][=Branch1][Ring2][=C][Ring1][=Branch1][O-1][N+1][=Branch1][C][=O][O-1][N+1][=Branch1][C][=O][O-1]"}]