Using CCOC(=O)C(=O)Nc1cc(Cl)c(Cl)c(Cl)c1[N+](=O)[O-] to produce O=c1[nH]c2cc(Cl)c(Cl)c(Cl)c2n(O)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.