Using BrC(Br)(Br)Br, CC(C)(C)c1cc(-c2nc(CO)co2)cc(C(C)(C)C)c1O to produce CC(C)(C)c1cc(-c2nc(CBr)co2)cc(C(C)(C)C)c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.