Hydrogen Tetrachloroaurate(III) hydrate, ROTI®METIC 99,999 % (5N), Molar mass (M) 339,79 + x H2O g/mol, Density (D) 3,9 g/cm³, CAS No. [27988-77-8], UN-Nr. 3260, EG-Nr. 240-948-4, Empirical formula HAuCl4 · x H2O