Sodium ammonium hydrogen phosphate, tetrahydrate, min. 99 %, p.a., Molar mass (M) 209,07 g/mol, Density (D) 0,85 g/cm³, CAS No. [7783-13-3], EG-Nr. 235-860-8, Empirical formula NaNH4HPO4 · 4 H2O