Using CN1CCN(c2cncc(Br)c2)CC1, CCCC[Sn](CCCC)(CCCC)c1cccs1 to produce CN1CCN(c2cncc(-c3cccs3)c2)CC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.