Using Nc1cc([N+](=O)[O-])ccc1-c1ccc([N+](=O)[O-])cc1, O=N[O-] to produce O=[N+]([O-])c1ccc(-c2ccc([N+](=O)[O-])cc2O)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.