Oxalic acid dihydrate, min. 99 %, cryst., Molar mass (M) 126,07 g/mol, Density (D) 1,65 g/cm³, Boiling point (bp) 149 to 160 °C, CAS No. [6153-56-6], EG-Nr. 205-634-3, Empirical formula C2H2O4 · 2 H2O