Using O=C(O)COc1ccc(CCNS(=O)(=O)c2ccccc2)cc1, O=[N+]([O-])O to produce O=C(O)COc1ccc(CCNS(=O)(=O)c2ccccc2)cc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.