The Ammonium Hyposulfite, with the CAS registry number 7783-18-8 and EINECS registry number 231-982-0, has the IUPAC name of diammonium thiosulfate. It is a kind of white or colourless crystals, and belongs to the following product categories: Industrial/Fine Chemicals; Inorganics; Ammonium Metal and Ceramic Science; Ammonium Salts; Inorganic Salts; Salts; Synthetic Reagents. It is sensitive to heat, and it is also incompatible with magnesium and aluminum powder. And the molecular formula of the chemical is N₂H₈S₂O₃. What's more, It is always used as fixer in the photographic industry.

The physical properties of Ammonium Hyposulfite are as followings: (1)ACD/LogP: -0.43; (2)# of Rule of 5 Violations: 0 ; (3)#H bond acceptors: 3; (4)#H bond donors: 2; (5)#Freely Rotating Bonds: 0; (6)Polar Surface Area: 98 Å².  

Preparation: First, you should get ammonium sulfite: the ammonium sulfite can be prepared by NH₄HCO₃, SO₂ and H₂O. Then ammonium sulfite can react with sulfur, after a series of filtration, evaporation, cooling crystallization, you can get Ammonium Hyposulfite.

You should be cautious while dealing with this chemical. It irritates to eyes, respiratory system and skin, and it has danger of cumulative effects. Therefore, you had better take the following instructions: Wear suitable gloves, and in case of contacting with eyes, rinse immediately with plenty of water and seek medical advice.

You can still convert the following datas into molecular structure:
(1)SMILES: [O-]S([O-])(=O)=S.[NH4+].[NH4+]
(2)InChI: InChI=1/2H3N.H2O3S2/c;;1-5(2,3)4/h2*1H3;(H2,1,2,3,4)
(3)InChIKey: XYXNTHIYBIDHGM-UHFFFAOYAF

The toxicity data is as follows: