Using BrCCCBr, COc1ccc2c(c1)S(=O)(=O)NC(=O)N2 to produce COc1ccc2c(c1)S(=O)(=O)N(CCCBr)C(=O)N2, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.