Using COC(=O)C(=O)c1ccc(OCCOc2cc3ccccc3cc2OCc2ccccc2)cc1 to produce COC(=O)C(=O)c1ccc(OCCOc2cc3ccccc3cc2O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.