Using CC(C)(C)OC(=O)N1CCN(S(=O)(=O)c2ccc3cc(Cl)ccc3c2)CC1CCO, BrC(Br)(Br)Br to produce CC(C)(C)OC(=O)N1CCN(S(=O)(=O)c2ccc3cc(Cl)ccc3c2)CC1CCBr, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.