Using CCCC[Sn](CCCC)(CCCC)c1cncnc1, COc1ccc2oc3ccc(Br)cc3c(=O)c2c1 to produce COc1ccc2oc3ccc(-c4cncnc4)cc3c(=O)c2c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.