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