Using CCOC(=O)c1nc(Br)c2nc(-c3ccccc3)sc2c1O, CCCC[Sn](CCCC)(CCCC)c1ccco1 to produce CCOC(=O)c1nc(-c2ccco2)c2nc(-c3ccccc3)sc2c1O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.