Using CCC(=O)O[C@H]1[C@@H](OC(C)=O)[C@H](n2ccc3c(N)ncnc32)O[C@@H]1COC(C)=O, O=[N+]([O-])O to produce CCC(=O)O[C@H]1[C@@H](OC(C)=O)[C@H](n2cc([N+](=O)[O-])c3c(N)ncnc32)O[C@@H]1COC(C)=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.