Using COC(=O)c1cc2c(OC(C)=O)cccc2n1S(=O)(=O)c1ccc(Cl)c(Cl)c1 to produce COC(=O)c1cc2c(O)cccc2n1S(=O)(=O)c1ccc(Cl)c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.