[{"from": "human", "value": "Please provide possible reagents based on the following chemical reaction. [C][#C][C][C][C][=Branch1][C][=O][O].[C][C][O]>>[C][#C][C][C][C][=Branch1][C][=O][O][C][C]"}, {"from": "gpt", "value": "[O][=S][=Branch1][C][=O][Branch1][C][O][O]"}]