[{"from": "human", "value": "From the provided chemical reaction, propose some possible reagents that could have been used. [C][C][C][C][C][C][Br].[N][#C][C][=C][Branch1][C][O][C][=C][C][Branch1][C][O][=C][Ring1][Branch2][C][#N]>>[C][C][C][C][C][C][O][C][=C][C][=C][Branch1][C][O][C][Branch1][Ring1][C][#N][=C][Ring1][=Branch2][C][#N]"}, {"from": "gpt", "value": "[C][N][Branch1][C][C][C][=O].[C][O].[O].[K+1].[OH1-1]"}]