Using COC(=O)C(C)(O)c1ccc(OCc2nc3ccc(OC)cc3n2C)cc1 to produce COc1ccc2nc(COc3ccc(C(C)(O)C(=O)O)cc3)n(C)c2c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.