IUPAC Name: (5E)-2,5-bis[Ethoxy(hydroxy)methylidene]thiolane-3,4-dione 
Following is the structure of 2,5-Thiophenedicarboxylicacid, 3,4-dihydroxy-, 2,5-diethyl ester (CAS NO.1822-66-8):
                  
Empirical Formula: C₁₀H₁₂O₆S
Molecular Weight: 260.2637 
Index of Refraction: 1.616
Molar Refractivity: 60.38 cm³
Molar Volume: 172.6 cm³
Density: 1.507 g/cm³
Flash Point: 161.7 °C
Melting point: 132-135 °C(lit.)
Surface Tension: 69.5 dyne/cm
Enthalpy of Vaporization: 68.06 kJ/mol
Boiling Point: 343.8 °C at 760 mmHg
Vapour Pressure: 4.41E-06 mmHg at 25 °C
Product Categories of 2,5-Thiophenedicarboxylicacid, 3,4-dihydroxy-, 2,5-diethyl ester (CAS NO.1822-66-8): Organic Electronics and Photonics; Synthetic Tools and Reagents; Thiophene Monomers and Building Blocks
Canonical SMILES: CCOC(=C1C(=O)C(=O)C(=C(O)OCC)S1)O
Isomeric SMILES: CCOC(=C1C(=O)C(=O)/C(=C(/O)\OCC)/S1)O
InChI: InChI=1S/C10H12O6S/c1-3-15-9(13)7-5(11)6(12)8(17-7)10(14)16-4-2/h13-14H,3-4H2,1-2H3/b9-7+,10-8?
InChIKey: WGXYDZOLBGAABB-BGTYPSCNSA-N

 2,5-Thiophenedicarboxylicacid, 3,4-dihydroxy-, 2,5-diethyl ester , its cas register number 1822-66-8. It also can be called Diethyl3,4-dihydroxy-2,5-thiophenedicarboxylate ; 2,5-Thiophenedicarboxylicacid, 3,4-dihydroxy-, diethyl ester (7CI,8CI,9CI) ; and 2,5-Diethoxycarbonyl-3,4-dihydroxythiophene .