Using O=[N+]=O, CSc1nccc(N2CCCn3c2nc(-c2ccccc2)cc3=O)n1 to produce CSc1nccc(N2CCCn3c2nc(-c2ccccc2)c([N+](=O)[O-])c3=O)n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.