Using C[Sn](C)(C)Cl, FC(F)(F)c1cc(Br)cc(C(F)(F)F)n1 to produce C[Sn](C)(C)c1cc(C(F)(F)F)nc(C(F)(F)F)c1, please predict the agent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.