Using CCOC(=O)CC(=O)c1ccc2c(c1)CC(CNS(=O)(=O)c1ccc(Cl)cc1)C2 to produce CCOC(=O)CC(O)c1ccc2c(c1)CC(CNS(=O)(=O)c1ccc(Cl)cc1)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.