Following is the structure of 2-(Fluorosulfonyl)difluoroacetic acid (CAS NO.1717-59-5):
                            
Empirical Formula: C₂HF₃O₄S
Molecular Weight: 178.0871 g/mol
Molar Refractivity: 22.13 cm³
Molar Volume: 93.5 cm³
Density: 1.902 g/cm³
Flash Point: 73.4 °C
Index of Refraction: 1.388
Surface Tension: 43.4 dyne/cm
Enthalpy of Vaporization: 47.83 kJ/mol
Boiling Point: 197.8 °C at 760 mmHg
Vapour Pressure: 0.158 mmHg at 25 °C
Sensitive of 2-(Fluorosulfonyl)difluoroacetic acid (CAS NO.1717-59-5): Moisture Sensitive
Product Categories of 2-(Fluorosulfonyl)difluoroacetic acid (CAS NO.1717-59-5): Sulfonyl Halides; Organic Building Blocks; Sulfur Compounds
SMILES: O=C(O)C(F)(F)S(F)(=O)=O
InChI: InChI=1/C2HF3O4S/c3-2(4,1(6)7)10(5,8)9/h(H,6,7)
InChIKey: VYDQUABHDFWIIX-UHFFFAOYAM

Hazard Codes: C
Risk Statements: 34
R34:Causes burns.
Safety Statements: 26-27-36/37/39
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice.
S27:Take off immediately all contaminated clothing.
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection.
RIDADR: UN 1760 8/PG 2
WGK Germany: 3
Hazard Note: Corrosive
HazardClass: 8
PackingGroup: II

 2-(Fluorosulfonyl)difluoroacetic acid , its cas register number is 1717-59-5. It also can be called 2,2-Difluoro-2-(fluorosulfonyl)acetic acid ; Acetic acid, 2,2-difluoro-2-(fluorosulfonyl)- .