Using COc1ccc2sccc2c1, O=Cc1cc(Br)c2ccccc2c1 to produce COc1ccc2sc(C(O)c3cc(Br)c4ccccc4c3)cc2c1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.