[{"from": "human", "value": "Based on the given chemical reaction, can you propose some likely reagents that might have been utilized? [C][=C][O][C][C][C][Ring1][=Branch1].[O][C][C][C][C][Br]>>[Br][C][C][C][C][O][C][C][C][C][C][O][Ring1][=Branch1]"}, {"from": "gpt", "value": "[Cl][C][Branch1][C][Cl][Cl].[O][=C][Branch1][C][O-1][O].[Na+1]"}]