Using BrC(Br)(Br)Br, CC(C)c1nnn(-c2c(Cl)cccc2Cl)c1CO to produce CC(C)c1nnn(-c2c(Cl)cccc2Cl)c1CBr, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.