Using [O-]Cl, CCOC(=O)C(C)(SC)C(=O)Nc1cc(Cl)cc(Cl)c1 to produce CCOC(=O)C(C)(C(=O)Nc1cc(Cl)cc(Cl)c1)S(C)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.