[{"from": "human", "value": "From the provided chemical reaction, propose some possible reagents that could have been used. [O][=C][C][=C][C][=C][Branch1][C][Br][N][=C][Ring1][#Branch1][Cl]>>[O][C][C][=C][C][=C][Branch1][C][Br][N][=C][Ring1][#Branch1][Cl]"}, {"from": "gpt", "value": "[C][C][C][O][C][Ring1][Branch1].[C][O].[BH4-1].[Cl-1].[NH4+1].[Na+1]"}]