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