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