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