NaOH in ethanol; water Au complex in EtOH was added to soln. of NaOH and thiomalic acid in H2Oat 0°C; warming to room temp.; evapn., dissoln. in H2O, adjustment of pH to 3.5, extn. with EtOAc; exts. were dried, filtered, evapd.; recrystn. from MeCN; elem. anal.;