Using Cn1c(=O)c2c(Cl)ccnc2n(C)c1=O, [N-]=[N+]=[N-] to produce Cn1c(=O)c2c(N=[N+]=[N-])ccnc2n(C)c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.