Using [N-]=[N+]=[N-], Cc1cc(C)c(NC(=O)CCl)c(Cl)c1 to produce Cc1cc(C)c(NC(=O)CN=[N+]=[N-])c(Cl)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.