Using BrCCCBr, O=S(=O)(c1ccccc1)C1(S(=O)(=O)c2ccccc2)CCC1 to produce O=S(=O)(c1ccccc1)C1(CCCBr)CCC1, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.