Using CC(C)(C)OC(=O)N(C(=O)OC(C)(C)C)c1cnc(Br)s1, OB(O)c1ncccc1F to produce CC(C)(C)OC(=O)N(C(=O)OC(C)(C)C)c1cnc(-c2cncc(F)c2)s1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.