Using O=[N+]([O-])O, CCC(=O)N1CCC[C@@H]2Cc3ccccc3C[C@H]21 to produce CCC(=O)N1CCC[C@@H]2Cc3cc([N+](=O)[O-])ccc3C[C@H]21, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.