Using CCCC[Sn](CCCC)(CCCC)c1nccs1, CCOC(=O)c1ccc2nc(Br)sc2c1 to produce CCOC(=O)c1ccc2nc(-c3nccs3)sc2c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.