Using COC(=O)c1c(S(C)(=O)=O)nsc1NC(=O)OC(C)(C)C, SCc1ccc(Cl)cc1 to produce COC(=O)c1c(SCc2ccc(Cl)cc2)nsc1NC(=O)OC(C)(C)C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.