Using O=[N+]([O-])O, CCCCC(=O)Nc1ccc(C(=O)OC)cc1 to produce CCCCC(=O)Nc1ccc(C(=O)OC)cc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.