[{"from": "human", "value": "Please provide possible reagents based on the following chemical reaction. [C][C][Branch1][C][C][Branch1][C][C][O][C][=Branch1][C][=O][N][C][C][C][C][C][C][Ring1][=Branch1][C][=Branch1][C][=O][N][C][C][#N]>>[N][#C][C][N][C][=Branch1][C][=O][C][C][C][C][C][C][Ring1][=Branch1][N]"}, {"from": "gpt", "value": "[O][=C][O]"}]