Using O=[N+]([O-])O, COc1ccc(Cl)cc1NC(=O)C1CCNCC1 to produce COc1cc([N+](=O)[O-])c(Cl)cc1NC(=O)C1CCNCC1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.