[{"from": "human", "value": "What can you tell me about this molecule? [C][N+1][Branch2][Ring2][#Branch2][C@@H1][C][C][Branch1][N][C][C@H1][Ring1][=Branch1][C@H1][C@@H1][Ring1][#Branch1][O][Ring1][Ring1][O][C][=Branch1][C][=O][C][Branch1][Branch2][C][=C][C][=C][S][Ring1][Branch1][Branch1][Branch2][C][=C][C][=C][S][Ring1][Branch1][O][C].[O].[Br-1]"}, {"from": "gpt", "value": "The molecule is the monohydrate bromide salt form of tiotropium, a quaternary ammonium derivative of atropine and a long-acting muscarinic receptor antagonist, with bronchodilating activity. Upon inhalation, tiotropium binds to and blocks mainly muscarinic M3 receptors located on smooth muscle cells, thereby preventing smooth muscle contraction."}]