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