[{"from": "human", "value": "From the provided chemical reaction, propose some possible reagents that could have been used. [N][C][=C][C][=C][Branch1][C][Br][C][Branch1][C][Cl][=C][Ring1][Branch2][N+1][=Branch1][C][=O][O-1]>>[N][C][=C][C][=C][Branch1][C][Br][C][Branch1][C][Cl][=C][Ring1][Branch2][N]"}, {"from": "gpt", "value": "[C][C][O].[O].[O][=C][Branch1][C][O-1][O-1].[Na+1].[Na+1]"}]