Using N=C(N)N[N+](=O)[O-], CCOC(=O)C(C=O)Cc1cnc(C)c(C)c1 to produce Cc1cc(Cc2cnc(N[N+](=O)[O-])[nH]c2=O)cnc1C, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.