[{"from": "human", "value": "From the provided chemical reaction, propose some possible reagents that could have been used. [O][=C][Branch1][C][O][C][C][C][C][C][C][=C][C][=C][C][Branch1][C][Br][=C][Ring1][#Branch1]>>[O][=C][C][C][C][C][C][C][=C][C][Branch1][C][Br][=C][C][=C][Ring1][#Branch1][Ring1][=N]"}, {"from": "gpt", "value": "[O][=S][Branch1][C][Cl][Cl].[S][=C][=S].[Al+3].[Cl-1].[Cl-1].[Cl-1]"}]