Using OB(O)c1ccnc(F)c1, CSc1nc(NC2CCCC2)n2nc(-c3ccccc3)c(Br)c2n1 to produce CSc1nc(NC2CCCC2)n2nc(-c3ccccc3)c(-c3ccnc(F)c3)c2n1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.