Using O=C(O)c1ccc(Cc2ccccc2)cc1, O=[N+]([O-])O to produce O=C(O)c1ccc(Cc2ccc([N+](=O)[O-])cc2)cc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.