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