Using O=[N+]([O-])O, COc1ccc(-c2cc(=O)n(C)c(=O)n2C)cc1 to produce COc1ccc(-c2cc(=O)n(C)c(=O)n2C)cc1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.