Using CC(=O)c1ccc(O)c(C(=O)O)c1, O=[N+]([O-])O to produce CC(=O)c1cc(C(=O)O)c(O)c([N+](=O)[O-])c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.