Using OCCBr, Clc1cc(Cl)c2c(c1)CC(Cl)c1ccccc1S2 to produce Clc1cc(Cl)c2c(c1)CC(OCCBr)c1ccccc1S2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.