Using O=[N+]([O-])c1ccc(-n2cccc2)c(CO)c1, BrC(Br)(Br)Br to produce O=[N+]([O-])c1ccc(-n2cccc2)c(CBr)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.