[{"from": "human", "value": "Given the following chemical reaction, what are some potential reagents that could have been employed? [O][C][C][Br].[C][=C][C][=C][Branch1][Ring2][S][Ring1][Branch1][C][C][N][C][Ring1][#Branch1]>>[O][C][C][N][C][C][C][S][C][=C][C][=Ring1][Branch1][C][Ring1][=Branch2]"}, {"from": "gpt", "value": "[C][C][O][C][Branch1][C][C][=O].[C][N][Branch1][C][C][C][=O].[O].[O][=C][Branch1][C][O-1][O-1].[I-1].[K+1].[K+1].[K+1]"}]