[{"from": "human", "value": "Can you suggest some reagents that might have been used in the given chemical reaction? [C][C][O][C][=Branch1][C][=O][C][C][C][N][C][C][Ring1][=Branch1].[C][O][C][C][C][Br]>>[C][C][O][C][=Branch1][C][=O][C][C][C][N][Branch1][=Branch1][C][C][C][O][C][C][C][Ring1][O]"}, {"from": "gpt", "value": "[C][C][#N].[O][=C][Branch1][C][O-1][O-1].[Cs+1].[Cs+1]"}]