IUPAC Name: 2-(2,3,4-Trifluorophenyl)acetonitrile 
Following is the structure of 2,3,5,6-Tetrafluoro-1,4-benzenedimethanol (CAS NO.243666-13-9):
                         
Empirical Formula: C₈H₄F₃N
Molecular Weight: 171.1193 g/mol
Molar Refractivity: 35.69 cm³
Molar Volume: 128.2 cm³
Density: 1.334 g/cm³
Flash Point: 85.2 °C
Index of Refraction: 1.468
Surface Tension: 35.7 dyne/cm
Enthalpy of Vaporization: 45.36 kJ/mol
Boiling Point of 2,3,5,6-Tetrafluoro-1,4-benzenedimethanol (CAS NO.243666-13-9): 217.2 °C at 760 mmHg
Vapour Pressure of 2,3,5,6-Tetrafluoro-1,4-benzenedimethanol (CAS NO.243666-13-9): 0.134 mmHg at 25 °C
Canonical SMILES: C1=CC(=C(C(=C1CC#N)F)F)F
InChI: InChI=1S/C8H4F3N/c9-6-2-1-5(3-4-12)7(10)8(6)11/h1-2H,3H2
InChIKey: BHGADPADDLWFSR-UHFFFAOYSA-N

Hazard Codes: T
Risk Statements 20/21/22-36/37/38 
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed. 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements 26-36/37/39 
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.
RIDADR: 3276
Hazard Note: Toxic
HazardClass: TOXIC

 2,3,5,6-Tetrafluoro-1,4-benzenedimethanol , its cas register number is 243666-13-9. It also can be called 2,3,4-Trifluorobenzyl cyanide ; and Benzeneacetonitrile, 2,3,4-trifluoro- .