Using O=C1CCC(=O)N1Br, C[C@H]1OC[C@]2(c3ccccc3F)N=C(N)SC[C@H]12 to produce C[C@H]1OC[C@]2(c3cc(Br)ccc3F)N=C(N)SC[C@H]12, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.