[{"from": "human", "value": "Please propose potential reagents that might have been utilized in the provided chemical reaction. [Cl][C][=C][C][Branch1][C][Cl][=N][C][Branch1][C][Cl][=N][Ring1][Branch2].[N][C][C][C][Br]>>[Cl][C][=C][C][Branch1][=Branch1][N][C][C][C][Br][=N][C][Branch1][C][Cl][=N][Ring1][N]"}, {"from": "gpt", "value": "[Br].[C][C][#N].[C][C][N][Branch1][Ring1][C][C][C][C]"}]