[{"from": "human", "value": "Based on the given chemical reaction, can you propose some likely reagents that might have been utilized? [C][S][C][=C][C][=C][Branch1][=Branch1][N+1][=Branch1][C][=O][O-1][C][Branch1][C][C][=C][Ring1][#Branch2][Br]>>[C][S][C][=C][C][=C][Branch1][C][N][C][Branch1][C][C][=C][Ring1][Branch2][Br]"}, {"from": "gpt", "value": "[C][C][=Branch1][C][=O][O-1].[C][C][=Branch1][C][=O][O-1].[C][C][O][C][C].[C][O].[BH4-1].[Cu+2].[Na+1]"}]