Using O=[N+]([O-])[O-], O=C1OC(=O)c2cc3ncccc3c3cccc1c23 to produce O=C1OC(=O)c2cc3ncccc3c3cc([N+](=O)[O-])cc1c23, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.