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