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