Empirical Formula: C₆H₁₀O₃
Molecular Weight: 130.1418 
Index of Refraction: 1.472
Molar Refractivity: 30.77 cm³
Molar Volume: 109.7 cm³ 
Surface Tension: 43 dyne/cm
Density: 1.185 g/cm³
Flash Point: 114 °C
Melting point: 87-89 °C
Enthalpy of Vaporization: 55.3 kJ/mol
Boiling Point: 264.5 °C at 760 mmHg
Vapour Pressure: 0.00282 mmHg at 25 °C
Appearance: White to light yellow crystal powder
Structure of Tetrahydro-2H-pyran-4-carboxylic acid (CAS NO.5337-03-1):
                    
IUPAC Name: Oxane-4-carboxylic acid
Canonical SMILES: C1COCCC1C(=O)O
InChI: InChI=1S/C6H10O3/c7-6(8)5-1-3-9-4-2-5/h5H,1-4H2,(H,7,8)
InChIKey: AVPKHOTUOHDTLW-UHFFFAOYSA-N
Product Category of Tetrahydro-2H-pyran-4-carboxylic acid (CAS NO.5337-03-1): Carboxes;Heterocycles;Carboxylic Acids;Pyrans, Piperidines & Piperazines;Pyran;organic intermediate

Hazard Codes of Tetrahydro-2H-pyran-4-carboxylic acid (CAS NO.5337-03-1): Xi
Risk Statements: 36/37/38 
R36/37/38:Irritating to eyes, respiratory system and skin.
Safety Statements: 26-36/37/39-22 
S22:Do not breathe dust.  
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.
Hazard Note: Irritant

 Tetrahydro-2H-pyran-4-carboxylic acid , its cas register number is 5337-03-1. It also can be called Tetrahydro-pyran-4-carboxylic acid ; Tetrahydropyran-4-yl-carboxylic acid ; and Tetrahydropyran-4-carboxylic acid .