Using CCOC(=O)c1nc2cccc(COc3ccc(OCc4ccc5ccccc5n4)cc3)c2o1 to produce O=C(O)c1nc2cccc(COc3ccc(OCc4ccc5ccccc5n4)cc3)c2o1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.