4-Methoxy-5-methylthieno[2,3-d]pyrimidine-6-carboxylic acid CAS 101668-00-2
| CAS No. | 101668-00-2 |
| Molecular Formula | C9H8N2O3S |
| Molecular Weight | 224.24 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
4-Methoxy-5-methylthieno[2,3-d]pyrimidine-6-carboxylic acid (CAS 101668-00-2) is a high-purity analytical reference standard with the molecular formula C9H8N2O3S and a molecular weight of 224.24 g/mol.
The molecular framework of 4-Methoxy-5-methylthieno[2,3-d]pyrimidine-6-carboxylic acid (C9H8N2O3S) is characterized by a nitrogen-containing heterocyclic scaffold, an amide group, a sulfone group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing 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 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.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C9H8N2O3S |
| Molecular Weight | 224.24 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 |
Related Methoxy Standards
- 3-Methoxy-5-(1H-pyrazol-1-yl)thiophene-2-carboxylic acid (CAS 120715-43-7)
- 5-Methoxy-2-methyl-6-nitro-benzothiazole (CAS 1858256-14-0)
- 5-Methoxy-2-methyl-4-nitrobenzo[d]thiazole (CAS 265312-58-1)
- 4-methoxy-2-(2-methylpropoxy)benzoic acid (CAS 1249464-35-4)
- 4-Methoxy-3-(3-methoxypropoxy)benzaldehyde (CAS 172900-75-3)
- 2-Methoxy-6-((4-methyl-1,3-dioxolan-2-yl)methyl)phenol (CAS 1822851-93-3)
- 1-[3-methoxy-4-(2-methoxyethoxy)phenyl]ethan-1-one (CAS 197359-41-4)
- 2-(3-Methoxy-4-propoxyphenyl)acetic acid (CAS 23918-27-6)
Recommended Standards
- 2-(2-Oxo-2,3-dihydro-1h-pyrido[2,3-b][1,4]thiazin-1-yl)acetic acid (CAS 100637-46-5)
- 3,7-dimethyl-5-oxo-5h-[1,3]thiazolo[3,2-a]pyrimidine-2-carboxylic acid (CAS 1017419-69-0)
- Tripropyl phosphate (CAS 513-08-6)
- 4-(Oxazol-5-yl)benzenesulfonamide (CAS 1019640-41-5)
- Potassium (E)-4-(4-methoxystyryl)pyrimidine-2-thiolate (CAS 318248-58-7)
- 1-Chloro-2-(chloromethoxy)benzene 58171-26-9 8609AB C7H6Cl2O (CAS 58171-26-9)
- Ginkgolide M (CAS 15291-78-8)
- (R)-5-bromo-2-(5-chloroindolin-2-yl)-3-fluorophenol (CAS 2055024-06-9)
- 1-Bromo-2-(methoxymethoxy)ethane (CAS 112496-94-3)
- Methyl 2-(4-methylpiperidin-1-yl)acetate hydrochloride (CAS 1820684-70-5)
- 2-Deoxy-2-fluoro-D-mannose (CAS 38440-79-8)
- 4-(Cyclopropylsulfamoyl)phenylboronic Acid (CAS 871329-67-8)
- 1-(4-Isobutylphenyl)ethane-1-sulfonyl chloride (CAS 1249516-74-2)
- Tirzepatide Impurity 57 (CAS CATO-C4X-324057)
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