[{"from": "human", "value": "Please give me some details about this molecule. [C][C][C][C][=Branch1][C][=O][S][C][C][N+1][Branch1][C][C][Branch1][C][C][C]"}, {"from": "gpt", "value": "The molecule is a quaternary ammonium ion obtained by the formal condensation of the carboxy group of butyric acid with the thiol group of thiocholine. It is used as a reagent for determination of butyrylcholinesterase activity."}]