[{"from": "human", "value": "Given this chemical reaction, what are some reagents that could have been used? [C][=C][C][C][C][=Branch1][C][=O][O].[C][C][I]>>[C][=C][C][C][C][=Branch1][C][=O][O][C][C]"}, {"from": "gpt", "value": "[C][C][O].[K+1].[OH1-1]"}]