Using CCCC[Sn](Cl)(CCCC)CCCC, FC(F)(F)c1ccccc1Br to produce CCCC[Sn](CCCC)(CCCC)c1ccccc1C(F)(F)F, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.