Using O=S([O-])OO, CC(CC=O)C(=O)C1=C(O)C2(CCOCC2)c2ccc(Cl)cc2C1=O to produce CC(CC(=O)O)C(=O)C1=C(O)C2(CCOCC2)c2ccc(Cl)cc2C1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.