Using CCCC[Sn](CCCC)(CCCC)c1ccco1, COC=C1C(=O)NC(=O)c2ccc(Br)cc21 to produce COC=C1C(=O)NC(=O)c2ccc(-c3ccco3)cc21, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.