[{"from": "human", "value": "What reagents could have been utilized in the following chemical reaction? [C][O][C][=C][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][N][=C][N][Ring1][=Branch1][C]>>[C][N][C][=N][C][=C][C][Branch1][C][O][=C][C][=C][Ring1][#Branch1][Ring1][#Branch2]"}, {"from": "gpt", "value": "[Br][B][Branch1][C][Br][Br].[Cl][C][Cl]"}]