Using O=[N+]([O-])[O-], CC(C)C(=O)c1cn(Cc2c(F)cccc2F)c2sc(-c3ccccc3)c(CBr)c2c1=O to produce CC(C)C(=O)c1cn(Cc2c(F)cccc2F)c2sc(-c3ccc([N+](=O)[O-])cc3)c(CBr)c2c1=O, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.