Using CC(Oc1c([N+](=O)[O-])ncc2c(Br)coc12)c1c(Cl)ccc(F)c1Cl to produce O=[N+]([O-])c1ncc2c(Br)coc2c1O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.