Using Cc1nc(-c2ccc(Oc3ccc(NC(=O)c4ccccn4)c(CN4CCCC4=O)c3)cn2)no1, O=[N+]([O-])[O-] to produce Cc1nc(-c2ccc(Oc3cc(CN4CCCC4=O)c(NC(=O)c4ccccn4)c([N+](=O)[O-])c3)cn2)no1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.