[{"from": "human", "value": "From the provided chemical reaction, propose some possible reagents that could have been used. [C][=C][C][Br].[C][O][C][=C][C][=C][C][=C][Branch1][C][O][C][=C][C][Ring1][#Branch1][=C][Ring1][O]>>[C][=C][C][O][C][=C][C][=C][C][=C][Branch1][Ring1][O][C][C][=C][C][Ring1][Branch2][=C][Ring1][N]"}, {"from": "gpt", "value": "[C][C][Branch1][C][C][=O].[O][=C][Branch1][C][O-1][O-1].[K+1].[K+1]"}]