[{"from": "human", "value": "What reagents could have been utilized in the following chemical reaction? [C][C][N][C][C][N][C][Ring1][#Branch1].[Cl][C][=N][C][=C][Branch1][C][Br][C][=N][Ring1][#Branch1]>>[Br][C][=C][N][=C][Branch1][#Branch2][N][C][C][C][N][C][C][Ring1][#Branch1][N][=C][Ring1][=N]"}, {"from": "gpt", "value": "[C][C][#N]"}]