[{"from": "human", "value": "Given the following chemical reaction, what are some potential reagents that could have been employed? [C][C][O].[N][C][C][C][C][C@H1][Branch1][C][N][C][=Branch1][C][=O][O]>>[C][C][O][C][=Branch1][C][=O][C@@H1][Branch1][C][N][C][C][C][C][N]"}, {"from": "gpt", "value": "[O][=S][=Branch1][C][=O][Branch1][C][O][O]"}]