Using CC(=O)O, CC(=O)Oc1ccccc1C(=O)NC(SC(C)C)C(Cl)(Cl)Cl to produce CC(=O)Oc1ccccc1C(=O)NC(S(=O)C(C)C)C(Cl)(Cl)Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.