Using Brc1cccc(Br)n1, COC(=S)c1cc([Sn](C)(C)C)c(C)s1 to produce COC(=S)c1cc(-c2cccc(Br)n2)c(C)s1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.