Using CC(=O)OC(C)(C)C(=O)Nc1ccccc1SCc1cc2c(cc1Cl)OCO2 to produce CC(C)(O)C(=O)Nc1ccccc1SCc1cc2c(cc1Cl)OCO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.