Using [N-]=[N+]=[N-], CC(=O)OCc1c(F)c(N)c2c(=O)cc(-c3ccc(NC(=O)CCl)c(F)c3)oc2c1F to produce CC(=O)OCc1c(F)c(N)c2c(=O)cc(-c3ccc(NC(=O)CN=[N+]=[N-])c(F)c3)oc2c1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.