Using CCOC(=O)C(C=O)Cc1ccco1, N=C(N)N[N+](=O)[O-] to produce O=c1[nH]c(N[N+](=O)[O-])ncc1Cc1ccco1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.