Using NO, COC(=O)c1cnc(N2CCN(S(=O)(=O)c3ccc([N+](=O)[O-])cc3)CC2)s1 to produce O=C(NO)c1cnc(N2CCN(S(=O)(=O)c3ccc([N+](=O)[O-])cc3)CC2)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.