Using O=[N+]([O-])O, CCOC(=O)CCCCCCc1ccc2ccccc2c1 to produce O=C(O)CCCCCCc1ccc2ccccc2c1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.