[2,3'-Bithiophene]-5-carboxylic acid

English name: [2,3'-Bithiophene]-5-carboxylic acid

Chemical formula: C₁₀H₈O₂S₂

Molecular weight: 224.30 g/mol

CAS number: 130624-04-9 (note that isomers exist in different substitution sites of bithiophene carboxylic acid, this is a 5-position carboxyl substitution)

Structural features: Two thiophene rings are connected by a 2,3'-position carbon-carbon bond (i.e., thiophene-2-yl and thiophene-3-yl are connected), and the 5-position of one thiophene ring (numbered based on the connecting bond) is substituted by a carboxyl group (-COOH), forming a sulfur-containing heterocyclic aromatic carboxylic acid with a conjugated system.