Using O=[N+]([O-])O, CC(C)(C)OC(=O)N1CCc2sccc2C1 to produce CC(C)(C)OC(=O)N1CCc2sc([N+](=O)[O-])cc2C1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.