[{"from": "human", "value": "What reagents could have been utilized in the following chemical reaction? [O][C][C][=C][N][=C][Branch1][C][I][C][Branch1][C][Cl][=C][Ring1][Branch2]>>[O][=C][C][=C][N][=C][Branch1][C][I][C][Branch1][C][Cl][=C][Ring1][Branch2]"}, {"from": "gpt", "value": "[Cl][C][Cl]"}]