[{"from": "human", "value": "From the provided chemical reaction, propose some possible reagents that could have been used. [C][C][C][N][C][C][Ring1][=Branch1].[C][C][O][C][Branch1][C][C][=N][O][C][C][C][Br]>>[C][C][O][C][Branch1][C][C][=N][O][C][C][C][N][C][C][C][C][C][Ring1][=Branch1]"}, {"from": "gpt", "value": "[C][C][C][C][=N][C][C][C][N][Ring1][=Branch1][C][C][Ring1][O].[Cl][C][Cl].[Cl-1].[NH4+1]"}]