[{"from": "human", "value": "Can you suggest some reagents that might have been used in the given chemical reaction? [I][I].[O][C][C][=C][C][=C][C][=Branch1][Ring2][=C][Ring1][=Branch1][O][C][O][Ring1][=Branch1]>>[O][C][C][=C][C][=C][Branch1][=Branch1][C][=C][Ring1][=Branch1][I][O][C][O][Ring1][Branch2]"}, {"from": "gpt", "value": "[Cl][C][Branch1][C][Cl][Cl]"}]