Using NC1=N[C@@]2(c3ccc(F)cc3F)CO[C@H](CF)[C@H]2CS1, O=C1CCC(=O)N1Br to produce NC1=N[C@@]2(c3cc(Br)c(F)cc3F)CO[C@H](CF)[C@H]2CS1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.