Using COc1cc(Br)c(OC)c2c(OC)cc(Br)c(OC)c12, CCCC[Sn](CCCC)(CCCC)c1cccs1 to produce COc1cc(-c2cccs2)c(OC)c2c(OC)cc(-c3cccs3)c(OC)c12, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.