Using O=C([O-])c1ccc(N2CCc3c([nH]c4ccccc34)C2)nc1, NO to produce O=C(NO)c1ccc(N2CCc3c([nH]c4ccccc34)C2)nc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.