[{"from": "human", "value": "Please suggest some possible reagents that could have been used in the following chemical reaction. [C][=O].[C][O][C][=Branch1][C][=O][C][=C][C][=C][Branch1][#Branch2][N][C][C][C][N][C][C][Ring1][#Branch1][N][=C][Ring1][=N]>>[C][O][C][=Branch1][C][=O][C][=C][C][=C][Branch1][=N][N][C][C][C][N][Branch1][C][C][C][C][Ring1][Branch2][N][=C][Ring1][=C]"}, {"from": "gpt", "value": "[O].[O][=C][O]"}]