Using O=[N+]([O-])O, CCOC(=O)C(C)Oc1ccnn1-c1c(Cl)cc(C(F)(F)F)cc1Cl to produce CCOC(=O)C(C)Oc1c([N+](=O)[O-])cnn1-c1c(Cl)cc(C(F)(F)F)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.