Using CNc1ccc(Oc2ccnc(C(=O)NCCO)c2)cc1[N+](=O)[O-] to produce CNc1ccc(Oc2ccnc(C(=O)NCCO)c2)cc1N, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.