Using COc1ccc(C(=O)O)cc1OS(C)(=O)=O, O=C(O)CS to produce COc1ccc(C(=O)SCC(=O)O)cc1OS(C)(=O)=O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.