IUPAC Name: Oxolane-2,5-dicarboxylic acid 
Following is the structure of Tetrahydrofuran-2,5-dicarboxylic acid (CAS NO.6338-43-8):
                          
Empirical Formula: C₆H₈O₅
Molecular Weight: 160.1247 
Index of Refraction: 1.531
Molar Refractivity: 32.26 cm³
Molar Volume: 104.2 cm³
Density: 1.535 g/cm³
Flash Point: 186.7 °C
Surface Tension: 69.7 dyne/cm
Enthalpy of Vaporization: 74.6 kJ/mol
Boiling Point of Tetrahydrofuran-2,5-dicarboxylic acid (CAS NO.6338-43-8): 425.5 °C at 760 mmHg
Vapour Pressure of Tetrahydrofuran-2,5-dicarboxylic acid (CAS NO.6338-43-8): 1.97E-08 mmHg at 25 °C
Canonical SMILES: C1CC(OC1C(=O)O)C(=O)O
InChI: InChI=1S/C6H8O5/c7-5(8)3-1-2-4(11-3)6(9)10/h3-4H,1-2H2,(H,7,8)(H,9,10)
InChIKey: CWZQRDJXBMLSTF-UHFFFAOYSA-N

 Tetrahydrofuran-2,5-dicarboxylic acid , its cas register number 6338-43-8. It also can be called 2,5-Furandicarboxylic acid, tetrahydro- .