Using O=S(=O)(O)O, COc1cccc(-c2ccc3cc(OC)ccc3c2Oc2ccc(C=O)cc2)c1 to produce COc1cccc(-c2ccc3cc(OC)ccc3c2Oc2ccc(O)cc2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.