Using OB(O)c1cccc(F)c1, CC1CN(C(=O)OC(C)(C)C)Cc2scc(Br)c2O1 to produce CC1CN(C(=O)OC(C)(C)C)Cc2scc(-c3cccc(F)c3)c2O1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.