[{"from": "human", "value": "From the provided chemical reaction, propose some possible reagents that could have been used. [O][=S][=Branch1][C][=O][C][C@@H1][C][C@H1][Ring1][=Branch1][C][N][Ring1][Branch1].[O][C][C][Br]>>[O][=S][=Branch1][C][=O][C][C@@H1][C][C@H1][Ring1][=Branch1][C][N][Ring1][Branch1][C][C][O]"}, {"from": "gpt", "value": "[C][C][#N].[O][=P][Branch1][C][O-1][Branch1][C][O-1][O-1].[I-1].[K+1].[K+1].[K+1].[K+1]"}]