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