5-Methyl-4-oxo-3H,4H-thieno[2,3-d]pyrimidine-6-carboxylic acid CAS 101667-97-4
| CAS No. | 101667-97-4 |
| Molecular Formula | C8H6N2O3S |
| Molecular Weight | 210.21 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies 5-Methyl-4-oxo-3H,4H-thieno[2,3-d]pyrimidine-6-carboxylic acid (CAS 101667-97-4), a certified reference material (molecular formula C8H6N2O3S, MW 210.21 g/mol) for analytical method development and quality control.
Owing to a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage, 5-Methyl-4-oxo-3H,4H-thieno[2,3-d]pyrimidine-6-carboxylic acid is typically off-white to pale yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 210.21 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
This reference standard is suitable for quantitative analysis on major chromatographic platforms including HPLC, GC, LC-MS/MS, and GC-MS, serving as an external calibration standard or a system suitability test reference material.
As a certified reference material (CRM), 5-Methyl-4-oxo-3H,4H-thieno[2,3-d]pyrimidine-6-carboxylic acid 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.
Physical & Chemical Properties
| Molecular Formula | C8H6N2O3S |
| Molecular Weight | 210.21 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 7.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1986 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Recommended Standards
- 2-(Methylthio)-7-nitrobenzo[d]oxazole (CAS 101084-56-4)
- BAL30072 Impurity 5 (CAS 102507-49-3)
- 2-(Methylthio)-6-nitrobenzo[d]oxazole (CAS 101084-55-3)
- Methyl 3-(thiophen-2-yl)-1,2,4-oxadiazole-5-carboxylate (CAS 1042151-18-7)
- Tert-butyl (S)-3-(methylsulfonamidomethyl)pyrrolidine-1-carboxylate (CAS 2381889-80-9)
- N-Methyl-1-(5-methyl-4-phenyl-4H-1,2,4-triazol-3-yl)methanamine dihydrochloride (CAS 1426290-88-1)
- 2-(Bromomethyl)-4-(difluoromethyl)-5-hydroxypyridine-3-acetic acid (CAS 1805997-39-0)
- (Z)-6-(5-(4-chlorobenzylidene)-4-oxo-2-thioxothiazolidin-3-yl)hexanoic acid (CAS 15164-08-6)
- 3-(4-ethylpiperazin-1-yl)-N-methyl-5-nitroaniline (CAS 1509397-22-1)
- 2-(2-{[(4-methylphenyl)sulfanyl]methyl}-1H-1,3-benzodiazol-1-yl)-N-phenylacetamide (CAS 344279-96-5)
- 5-Iodothiazolo[5,4-b]pyridin-2-amine (CAS 1355241-53-0)
- Hexafluoroisopropyl trifluoroacetate (CAS 42031-15-2)
- [3-Fluoro-4-(oxan-4-ylmethoxy)phenyl]methanamine hydrochloride (CAS 1402232-74-9)
- [Plus-β-Ala28]-Semaglutide (CAS CATO-C4X-2226221)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com