Using O=[N+]([O-])O, CC(=O)Nc1cc2nc3n(c2cc1C)CCC3 to produce CC(=O)Nc1c(C)cc2c(nc3n2CCC3)c1[N+](=O)[O-], please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.