Using O=[N+]([O-])O, CCCCC(=O)Nc1cccc(C(=O)OC)c1 to produce CCCCC(=O)Nc1cc(C(=O)OC)ccc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.