[{"from": "human", "value": "Given the following reaction, what are some possible reagents that could have been utilized? [C][C][I].[O][=C][Branch1][C][O][C][=C][C][=C][Branch1][C][Cl][C][Branch1][C][Br][=C][Ring1][Branch2]>>[C][C][O][C][=Branch1][C][=O][C][=C][C][=C][Branch1][C][Cl][C][Branch1][C][Br][=C][Ring1][Branch2]"}, {"from": "gpt", "value": "[C][C][#N].[O][=C][Branch1][C][O-1][O-1].[Cs+1].[Cs+1]"}]