Using O=[N+]([O-])[O-], O=C(O)CCCc1c(-c2ccccc2)[nH]c2ccccc12 to produce O=C(O)CCCc1c(-c2ccccc2)[nH]c2ccc([N+](=O)[O-])cc12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.