[{"from": "human", "value": "Please propose potential reagents that might have been utilized in the provided chemical reaction. [Cl][C][C][Br].[O][C][=C][C][=C][Branch1][C][I][C][=C][Ring1][#Branch1]>>[Cl][C][C][O][C][=C][C][=C][Branch1][C][I][C][=C][Ring1][#Branch1]"}, {"from": "gpt", "value": "[C][C][#N].[O][=C][Branch1][C][O-1][O-1].[Cs+1].[Cs+1]"}]