Molecular structure of Sodium hydrogen difluoride (CAS NO.1333-83-1) is:

Product Name: Sodium hydrogen difluoride
CAS Registry Number: 1333-83-1
IUPAC Name: sodium fluoride hydrofluoride
Molecular Weight: 61.994516 [g/mol]
Molecular Formula: F₂HNa
H-Bond Donor: 1
H-Bond Acceptor: 2 
EINECS: 215-608-3
Melting Point: >68 °C (dec.)
Enthalpy of Vaporization: 25.54 kJ/mol
Boiling Point: 19.5 °C at 760 mmHg
Vapour Pressure: 922 mmHg at 25°C
Density: 2.08 
Other Registry Number: 17097-13-1 ;70876-64-1 ;7783-37-1 
Related Registry Number: 7681-49-4 (Parent)
Product Categories: Inorganics

 Sodium hydrogen difluoride (CAS NO.1333-83-1) is used as a preservative for anatomical and zoological specimens, in metal plating and for many other uses.

Safty information about Sodium hydrogen difluoride (CAS NO.1333-83-1) is:
Hazard Codes: T,C
Risk Statements: 25-34 
R25 :Toxic if swallowed. 
R34:Causes burns.
Safety Statements: 22-26-37-45 
S22:Do not breathe dust. 
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S37:Wear suitable gloves. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.)
RIDADR: UN 2439 8/PG 2
WGK Germany: 1
RTECS: WB0350010
HazardClass: 8
PackingGroup: II

 Sodium hydrogen difluoride , its cas register number is 1333-83-1. It also can be called Sodium bifluoride ; Fluorure acide de soodium ; Fluoruro acido de sodio ; Sodium acid fluoride ; Sodium bifluoride .It is a white crystalline solid and soluble in water. It is corrosive to tissue.It reacts with water liberating heat and forming a corrosive solution. The reaction is not violent.