Using COC(=O)c1ccccc1COc1cccc(CCOc2ccc(OCc3ccccc3)cc2)c1 to produce O=C(O)c1ccccc1COc1cccc(CCOc2ccc(OCc3ccccc3)cc2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.