[{"from": "human", "value": "Based on the given chemical reaction, can you propose some likely reagents that might have been utilized? [O][C][C][C][C][C][C][C][C][C][Br]>>[O][=C][C][C][C][C][C][C][C][C][Br]"}, {"from": "gpt", "value": "[C][C][N][Branch1][=Branch1][C][Branch1][C][C][C][C][Branch1][C][C][C].[C][S][Branch1][C][C][=O].[Cl][C][Cl]"}]