[{"from": "human", "value": "From the provided chemical reaction, propose some possible reagents that could have been used. [Br][Br].[C][C][=C][C][=C][C][Branch1][C][N][=N][Ring1][#Branch1]>>[C][C][=C][C][=C][Branch1][C][Br][C][Branch1][C][N][=N][Ring1][Branch2]"}, {"from": "gpt", "value": "[O].[O][=S][=Branch1][C][=O][Branch1][C][O][O].[Na+1].[OH1-1]"}]