ZPS(3-(benzothiazolyl-2-mercapto)-propylsulfonate ,sodium salt) CAS:49625-94-7 Trade name ZPS Chemical name 3-(benzothiazolyl-2-mercapto)-propylsulfonate ,sodium salt Molecular formula C10H10O3NaNS3 Assay 90% Appearance: Yellowish powder Application: used as top brightener in baths for copper and precious metals at a concentration of 10-50mg/L.