Using O=C(c1ccc(OCc2ccccc2)cc1)c1ccc(OCc2ccccc2)cc1O to produce Oc1cc(OCc2ccccc2)ccc1C(O)c1ccc(OCc2ccccc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.