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