Using C[C@H]1OC[C@]2(c3ccc(F)cc3F)N=C(NC(=O)c3ccccc3)SC[C@H]12, O=C1CCC(=O)N1Br to produce C[C@H]1OC[C@]2(c3cc(Br)c(F)cc3F)N=C(NC(=O)c3ccccc3)SC[C@H]12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.