Using OB(O)c1cccnc1F, Cc1nc(N)nc2c1C(=O)CC(c1ccc(F)cc1Br)C2 to produce Cc1nc(N)nc2c1C(=O)CC(c1ccc(F)cc1-c1cccnc1F)C2, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.