Using Nc1cc(F)c(S)cc1F, FC(F)(F)c1ccc(Cl)c(Cl)c1 to produce Nc1cc(F)c(Sc2ccc(C(F)(F)F)cc2Cl)cc1F, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.