3-mercapto-1-propane-sulfonicacid, sodium salt and carbon disulfide were obtained from Acros and Aldrich respectively. All other materials were reagent grade unless otherwise specified. All reactions were carried out in a dry nitrogen atmosphere. 1H and 13C NMR spectra were obtained on a 400-MHz Bruker Avance NMR spectrometer. Infrared spectra were obtained on a Nicolet Magna-IR 560 spectrometer E.S.P. Elemental analyses were obtained with a CE Elantech Thermo-Finnigan Flash 1112 CHN elemental analyzer. Melting points were collected on a TA Instruments DSC 2010 Differential Scanning Calorimeter using a heating rate of 108 o C/min and nitrogen as a purge gas.