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