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