Using Cc1nc2ccc(Br)cn2c(=O)c1CCO, CCCC[Sn](CCCC)(CCCC)c1cccs1 to produce Cc1nc2ccc(-c3cccs3)cn2c(=O)c1CCO, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.