[{"from": "human", "value": "Could you give me a brief overview of this molecule? [C][N+1][Branch1][C][C][Branch1][C][11CH3][C][C][O].[Cl-1]"}, {"from": "gpt", "value": "The molecule is a quaternary ammonium salt that is the chloride salt of (11)C-choline. An intravenous radioactive diagnostic agent used as a tracer during positron emission tomography scans to help detect sites of recurrent prostate cancer. It has a role as a radioactive tracer, a radioactive imaging agent and a diagnostic agent. It is a chloride salt, a quaternary ammonium salt and an (11)C-modified compound. It contains an (11)C-choline."}]