Potassium sodium tartrate tetrahydrate, min. 99 %, p.a., ACS, ISO, Molar mass (M) 282,22 g/mol, Density (D) 1,79 g/cm³, CAS No. [6381-59-5], EG-Nr. 205-698-2, Empirical formula C4H4KNaO6 · 4 H2O