Using O=[N+]([O-])[O-], COC(=O)c1ccc(N)c2c1OCCO2 to produce COC(=O)c1cc([N+](=O)[O-])c(N)c2c1OCCO2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.