Using COC(=O)CS, COCCOCn1c(Cl)c(C(C)=O)c2ccccc21 to produce COCCOCn1c2ccccc2c2c(C)c(C(=O)OC)sc21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.