Using CC(C)(C)OC(=O)N[C@H](Cc1ccc(-c2ccccc2)cc1)C[C@@H](O)C(=O)O, O=[N+]([O-])OCCCCO to produce CC(C)(C)OC(=O)N[C@H](Cc1ccc(-c2ccccc2)cc1)C[C@@H](O)C(=O)OCCCCO[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.