Using Nc1nc(-c2ccc(NC(=O)CN(C(=O)c3ccc(F)cc3)c3ccc(F)cc3)cc2)cs1, BrBr to produce Nc1nc(-c2ccc(NC(=O)CN(C(=O)c3ccc(F)cc3)c3ccc(F)cc3)cc2)c(Br)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.