Using FC(F)(Cl)CCl, CC(C)(C)OC(=O)NC(CCS)C(=O)O to produce CC(C)(C)OC(=O)NC(CCSC(F)(F)CCl)C(=O)O, please predict the solvent for this reaction in SMILES notation in \boxed{$SMILES1, SMILES2, ...} format.