[{"from": "human", "value": "Given this chemical reaction, what are some reagents that could have been used? [Br][Br].[C][O][C][=N][C][=C][C][=C][Ring1][=Branch1][C][#N]>>[C][O][C][=N][C][=C][Branch1][C][Br][C][=C][Ring1][#Branch1][C][#N]"}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][O].[C][C][=Branch1][C][=O][O-1].[Na+1]"}]