Using OB(O)c1ccc(Cl)cc1, COC(=O)c1sc(-c2ccccc2Cl)c(Br)c1OC to produce COC(=O)c1sc(-c2ccccc2Cl)c(-c2ccc(Cl)cc2)c1OC, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.