Using CC(C)(C)OC(=O)N1CCC(Nc2ccc(S(=O)(=O)c3ccccc3)cc2O)CC1, ClCCBr to produce CC(C)(C)OC(=O)N1CCC(Nc2ccc(S(=O)(=O)c3ccccc3)cc2OCCCl)CC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.