Using O=C(O)C(=O)c1ccc(OCCCCCCc2cccc(OCc3ccccc3)c2OCc2ccccc2)cc1 to produce O=C(O)C(=O)c1ccc(OCCCCCCc2cccc(O)c2O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.