Using CCCN(c1cc(CO)cc(Cl)n1)S(C)(=O)=O, BrC(Br)(Br)Br to produce CCCN(c1cc(CBr)cc(Cl)n1)S(C)(=O)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.