Using O=c1c2c(-c3ccccc3)coc2ncn1CC(F)(F)F, BrBr to produce O=c1c2c(-c3ccccc3)c(Br)oc2ncn1CC(F)(F)F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.