[{"from": "human", "value": "Given the following chemical reaction, what are some potential reagents that could have been employed? [N][C][Branch1][Ring1][C][O][C][O].[O][=C][Branch1][Ring1][C][O][C][O]>>[O][C][C][Branch1][Ring1][C][O][N][C][Branch1][Ring1][C][O][C][O]"}, {"from": "gpt", "value": "[C][O].[H][H].[Ni]"}]