[{"from": "human", "value": "Please give me some details about this molecule. [C][N+1][Branch2][Ring2][Ring1][C@H1][C][C][Branch1][N][C][C@H1][Ring1][=Branch1][C][C][Ring1][#Branch1][O][Ring1][Ring1][O][C][=Branch1][C][=O][C@H1][Branch1][Ring1][C][O][C][=C][C][=C][C][=C][Ring1][=Branch1][C].[Br-1]"}, {"from": "gpt", "value": "A muscarinic antagonist used to study binding characteristics of muscarinic cholinergic receptors."}]