[{"from": "human", "value": "Based on the given chemical reaction, suggest some possible reagents. [Br][Br].[C][C][=C][C][=C][C][=C][Ring1][=Branch1][C][#N]>>[C][C][=C][C][=C][Branch1][C][Br][C][=C][Ring1][#Branch1][C][#N]"}, {"from": "gpt", "value": "[C][O].[O].[O][=C][Branch1][C][O][O].[O][=C][Branch1][C][O-1][O-1].[K+1].[K+1]"}]