[{"from": "human", "value": "Based on the given chemical reaction, can you propose some likely reagents that might have been utilized? [Br][Br].[O][C][=C][C][=C][C][=N][C][=C][C][Ring1][=Branch1][=C][Ring1][#Branch2]>>[O][C][=C][C][=C][C][=N][C][=C][C][Ring1][=Branch1][=C][Ring1][#Branch2][Br]"}, {"from": "gpt", "value": "[C][C][O][C][Branch1][C][C][=O].[Cl][C][Branch1][C][Cl][Cl]"}]