[{"from": "human", "value": "Please propose potential reagents that might have been utilized in the provided chemical reaction. [C][O].[C][O][C][=C][C][=C][C][Branch1][=Branch1][C][=Branch1][C][=O][O][=C][Ring1][=Branch2][I]>>[C][O][C][=Branch1][C][=O][C][=C][C][=C][C][Branch1][Ring1][O][C][=C][Ring1][Branch2][I]"}, {"from": "gpt", "value": "[O].[O][=S][=Branch1][C][=O][Branch1][C][O][O]"}]