Using Cc1nn(C)c(Br)c1Oc1ccc(F)cc1Cl, OB(O)c1ccc(F)cc1F to produce Cc1nn(C)c(-c2ccc(F)cc2F)c1Oc1ccc(F)cc1Cl, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.