Following is the structure of Tetrahydro-2H-pyran-4-carbonyl chloride (CAS NO.40191-32-0):
                       
Empirical Formula: C₆H₉ClO₂
Molecular Weight: 148.5875
Index of Refraction: 1.463
Molar Refractivity: 34.08 cm³
Molar Volume: 123.6 cm³
Polarizability: 13.51×10^-24cm³
Surface Tension: 36.1 dyne/cm
Density: 1.201 g/cm³
Flash Point: 71.8 °C
Enthalpy of Vaporization: 43.18 kJ/mol
Boiling Point: 195.6 °C at 760 mmHg
Vapour Pressure: 0.416 mmHg at 25 °C
Product Categories: ACIDHALIDE
SMILES: ClC(=O)C1CCOCC1
InChI: InChI=1/C6H9ClO2/c7-6(8)5-1-3-9-4-2-5/h5H,1-4H2
InChIKey: RYGUCYSSMOFTSH-UHFFFAOYAV

Hazard Codes of Tetrahydro-2H-pyran-4-carbonyl chloride (CAS NO.40191-32-0): 
Xi,C
Risk Statements: 14-20/21/22-29-34 
R14 :Reacts violently with water. 
R20/21/22:Harmful by inhalation, in contact with skin and if swallowed. 
R29:Contact with water liberates toxic gas. 
R34:Causes burns.
Safety Statements: 23-24/25-36/37/39-45 
S23:Do not breathe vapour. 
S24/25:Avoid contact with skin and eyes. 
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.)
Hazard Note: Irritant

Tetrahydro-2H-pyran-4-carbonyl chloride with cas register number 40191-32-0 can be called 2H-pyran-4-carbonyl chloride, tetrahydro-.