The 3,4-Thiophenedicarboxylicacid, with the CAS registry number 4282-29-5, is also known as 3,4-Dicarboxythiophene. It belongs to the product categories of Acids and Derivatives; Heterocycles; API Intermediates; Building Blocks; Carboxy; Thiophene. This chemical's molecular formula is C₆H₄O₄S and molecular weight is 172.16. What's more, both its IUPAC name and systematic name are the same which is called Thiophene-3,4-dicarboxylic acid. It is yellow to beige-pinkish or light brown crystalline.

Physical properties about 3,4-Thiophenedicarboxylicacid are: (1)ACD/LogP: 0.35; (2)# of Rule of 5 Violations: 0; (3)ACD/LogD (pH 5.5): -2.74; (4)ACD/LogD (pH 7.4): -3.8; (5)ACD/BCF (pH 5.5): 1; (6)ACD/BCF (pH 7.4): 1; (7)ACD/KOC (pH 5.5): 1; (8)ACD/KOC (pH 7.4): 1; (9)#H bond acceptors: 4; (10)#H bond donors: 2; (11)#Freely Rotating Bonds: 2; (12)Polar Surface Area: 80.84 Å²; (13)Index of Refraction: 1.662; (14)Molar Refractivity: 38.49 cm³; (15)Molar Volume: 103.9 cm³; (16)Surface Tension: 83.9 dyne/cm; (17)Density: 1.655 g/cm³; (18)Flash Point: 199.3 °C; (19)Enthalpy of Vaporization: 69.34 kJ/mol; (20)Boiling Point: 405.9 °C at 760 mmHg; (21)Vapour Pressure: 2.57E-07 mmHg at 25 °C; (22)Melting Point: 227-231 °C.

When you are dealing with this chemical, you should be very careful. This chemical is irritating to eyes, respiratory system and skin. Therefore, you should wear suitable protective clothing, gloves and eye/face protection. You should avoid contacting with skin and eyes. In case of contacting with eyes, you should rinse immediately with plenty of water and seek medical advice.

You can still convert the following datas into molecular structure:
(1) SMILES: O=C(O)c1cscc1C(=O)O
(2) InChI: InChI=1/C6H4O4S/c7-5(8)3-1-11-2-4(3)6(9)10/h1-2H,(H,7,8)(H,9,10)
(3) InChIKey: ZWWLLYJRPKYTDF-UHFFFAOYAU