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