The chemical Ferrous ammonium sulfate hexahydrate has a known molecular formula of H4-N2.Fe.2O4-S.6H2-O, Fe.2H3-N.2H2-O4-S.6H2-O. Synonyms may include: Ammonium ferrous sulfate hexahydrate, Ferrous ammonium sulfate, hexahydrate, Iron ammonium sulfate hydrate, Sulfuric acid, ammonium iron(2+) salt, hexahydrate, UNII-99A04ICQ3J (ChemID).