Thieno[3,2-b]thiophene-2-carboxylic acid
![Structure image for Thieno[3,2-b]thiophene-2-carboxylic acid](/uploads/upload/20250706/250F6161925542.png)
![Appearance image for Thieno[3,2-b]thiophene-2-carboxylic acid](/uploads/upload/20250706/250F6161932450.png)
Product Specifications
- CAS
- 1723-27-9
- MF
- C7H4O2S2
- Appearance
- white solid
- Synonym(s)
- thieno[3,2-b]thiophene-5-carboxylic acid
- Shipping
- ambient temperature
- Storage
- 2-8°C
Thieno[3,2-b]thiophene-2-carboxylic acid is tied to CAS 1723-27-9 and molecular formula C7H4O2S2. PubChem resolves that CAS to one compound, CID 660319, and records Thieno(3,2-b)thiophene-2-carboxylic acid as its title. The site name appears in the same synonym set. PubChem’s IUPAC field numbers the carboxyl-bearing atom as position 5, so the CID, CAS, and structure identifiers are important when the two numbering expressions are encountered.
The verified SMILES is C1=CSC2=C1SC(=C2)C(=O)O. It describes a fused bicyclic framework containing two sulfur atoms and one carboxylic-acid group. Formula C7H4O2S2 accounts for both ring sulfurs and the two carboxyl oxygens. InChIKey GVZXSZWCZGKLRS-UHFFFAOYSA-N points to the same PubChem graph. Checking this key together with the SMILES prevents a numbering convention from being mistaken for a different molecular connection.
A structure-specific enquiry should cite CAS 1723-27-9, CID 660319, and the complete fused-ring name shown on this page. A MOL or SDF file can provide an additional graph reference when a request arrives under the alternative ring numbering. The molecular formula, full SMILES, and InChIKey can then be compared as a single identity set. This page limits its statements to that verified set and does not infer any unrecorded material characteristic from the name alone.