Using O=C(OCc1ccccc1)c1cc(Cl)cc(OCCCON2C(=O)c3ccccc3C2=O)c1 to produce NOCCCOc1cc(Cl)cc(C(=O)OCc2ccccc2)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.