Using Fc1c(Cl)cccc1CBr, Nc1nc(S)nc(S)c1N to produce Nc1nc(SCc2cccc(Cl)c2F)nc(SCc2cccc(Cl)c2F)c1N, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.