Using CC1(c2cccc(NS(C)(=O)=O)c2)C2CNCC21, O=C(O)CCc1ccc(Cl)c(Cl)c1 to produce CC1(c2cccc(NS(C)(=O)=O)c2)C2CN(C(=O)CCc3ccc(Cl)c(Cl)c3)CC21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.