Molecular Structure of Nonafluorobutanesulfonyl fluoride (CAS NO.375-72-4):

IUPAC Name: 1,1,2,2,3,3,4,4,4-nonafluorobutane-1-sulfonyl fluoride 
Empirical Formula: C₄F₁₀O₂S
Molecular Weight: 302.0906
H bond acceptors: 2
H bond donors: 0
Freely Rotating Bonds: 3
Polar Surface Area: 42.52 Å²
Index of Refraction: 1.287
Molar Refractivity: 30.6 cm³
Molar Volume: 170.2 cm³
Surface Tension: 17.8 dyne/cm
Density: 1.774 g/cm³
Enthalpy of Vaporization: 29.36 kJ/mol
Boiling Point: 64.2 °C at 760 mmHg
Vapour Pressure: 178 mmHg at 25°C
Melting point: -110°C
Sensitive: Moisture Sensitive
BRN: 1813589
EINECS: 206-792-6
Product Categories: Fluorous Chemistry; Fluorous Compounds; Synthetic Organic Chemistry; Organic Building Blocks; Sulfonyl Halides; Sulfur Compounds
InChI
InChI=1/C4F10O2S/c5-1(6,3(9,10)11)2(7,8)4(12,13)17(14,15)16
Smiles
O=S(=O)(F)C(F)(F)C(F)(F)C(F)(F)C(F)(F)F

Hazard Codes: C
Risk Statements: 34
R34:Causes burns.
Safety Statements: 26-36/37/39-45-25
S26: In case of contact with eyes, rinse immediately with plenty of water and seek medical advice. 
S36/37/39:Wear suitable protective clothing, gloves and eye/face protection. 
S45:In case of accident or if you feel unwell, seek medical advice immediately (show the label whenever possible.) 
S25:Avoid contact with eyes.
RIDADR: UN 3265 8/PG 2
WGK Germany: 3
F: 10-21
Hazard Note: Corrosive
HazardClass: 8
PackingGroup: II

 Nonafluorobutanesulfonyl fluoride , with CAS number of 375-72-4, can be called Nonafluorobutanesulfonyl fluoride ; nonafluorobutanesulphonyl fluoride ; nonafluoro-1-butanesulfonyl fluoride ; perfluorobutanesulfonyl fluoride ; perfluoro-1-butanesulfonyl fluoride ; perfluorobutanesulphonyl fluoride ; 1,1,2,2,3,3,4,4,4-nonafluoro-1-butanesulfonylfluorid ; 1,1,2,2,3,3,4,4,4-nonafluoro-1-butanesulfonylfluoride . It is a clear colorless liquid.