Using O=[N+]([O-])O, CCCCCCCCCCC(C)(C)C(=O)Nc1c(C)cc(C)c2c1OC(C)(C)C2 to produce CCCCCCCCCCC(C)(C)C(=O)Nc1c(C)c([N+](=O)[O-])c(C)c2c1OC(C)(C)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.