Using O=[N+]([O-])O, COc1cc(C(C)=O)ccc1OCc1ccccc1 to produce COc1cc(C(C)=O)c([N+](=O)[O-])cc1OCc1ccccc1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.