| CAS No. | 4101-81-9 |
| Molecular Formula | C8H8O3S |
| Molecular Weight | 184.21 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Compared with other compounds in its class, the molecular weight of 184.21 g/mol gives Methyl 5-acetylthiophene-2-carboxylate(Arotinolol Impurity 6) distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
CATO supplies Methyl 5-acetylthiophene-2-carboxylate(Arotinolol Impurity 6) (CAS 4101-81-9), a pharmacopoeial impurity reference standard (molecular formula C8H8O3S, MW 184.21 g/mol) used for the identification and quantification of trace impurities in APIs.
The molecular framework of Methyl 5-acetylthiophene-2-carboxylate(Arotinolol Impurity 6) (C8H8O3S) is characterized by a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system. In reversed-phase chromatography, its retention is governed primarily by the polarity and ionization state of its functional groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
This reference standard supports related-substances testing and method development in line with ICH Q3A/Q3B guidance on impurity control, and is suitable for system suitability testing and forced-degradation studies.
As a certified reference material (CRM), Methyl 5-acetylthiophene-2-carboxylate(Arotinolol Impurity 6) meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
| Molecular Formula | C8H8O3S |
| Molecular Weight | 184.21 g/mol |
| Purity | >95% |
| Storage | Store at 2-8°C, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1958 |
| Sulfur Atoms | 1 |