Using O=C(Cl)CCl, CC(C)N1C(=O)c2ccccc2NS1(=O)=O to produce CC(C)N1C(=O)c2ccccc2N(C(=O)CCl)S1(=O)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.