[{"from": "human", "value": "Please provide possible reagents based on the following chemical reaction. [C][C][C][C][Br].[C][O][C][=C][C][Branch1][Ring2][C][C][#N][=C][C][=C][Ring1][=Branch2][O]>>[C][C][C][C][O][C][=C][C][=C][Branch1][Ring2][C][C][#N][C][=C][Ring1][=Branch2][O][C]"}, {"from": "gpt", "value": "[C][C][Branch1][C][C][=O].[C][C][O][C][C].[O][=C][Branch1][C][O-1][O-1].[K+1].[K+1]"}]