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