[{"from": "human", "value": "Given this chemical reaction, what are some reagents that could have been used? [Br][Br].[N][C][=C][C][=C][Branch1][C][Cl][C][=N][Ring1][#Branch1]>>[N][C][=N][C][=C][Branch1][C][Cl][C][=C][Ring1][#Branch1][Br]"}, {"from": "gpt", "value": "[Cl][C][Branch1][C][Cl][Cl].[O][=C][Branch1][C][O-1][O].[O][=S][Branch1][C][O-1][O].[Na+1]"}]