4-Oxo-1,4-dihydrothieno[2,3-d]pyrimidine-6-carboxylic acid CAS 439693-47-7
| CAS No. | 439693-47-7 |
| Molecular Formula | C7H4N2O3S |
| Molecular Weight | 196.18 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Based on its molecular formula C7H4N2O3S, 4-Oxo-1,4-dihydrothieno[2,3-d]pyrimidine-6-carboxylic acid contains an amide group, a sulfone group, a carboxylic acid group, a hydroxyl group, an ether linkage, an aromatic ring system; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 196.18 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
4-Oxo-1,4-dihydrothieno[2,3-d]pyrimidine-6-carboxylic acid (CAS 439693-47-7) is a high-purity analytical reference standard with the molecular formula C7H4N2O3S and a molecular weight of 196.18 g/mol.
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 | C7H4N2O3S |
| Molecular Weight | 196.18 g/mol |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, ethanol, DMSO, water |
| 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.) | 2025 |
| Nitrogen Atoms | 2 |
| Sulfur Atoms | 1 |
Related Oxo Standards
- 4-Oxo-3,4-dihydrothieno[3,2-d]pyrimidine-2-carboxylic acid (CAS 1029420-51-6)
- 4-Oxo-1,4-dihydrothieno[2,3-d]pyrimidine-5-carboxylic acid (CAS 1104926-91-1)
- 4-Oxo-3,4-dihydrothieno[3,2-d]pyrimidine-7-carboxylic acid (CAS 1527518-33-7)
- 4-Oxo-4,6-dihydrothieno[2,3-d]pyrimidine-5-carboxylic acid (CAS 1822944-34-2)
- 4-Oxo-1,4-dihydrothieno[2,3-d]pyrimidine-5-carboxamide (CAS 1801143-25-8)
- 7-Oxo-4,7-dihydrothieno[3,2-b]pyridine-6-carboxylic acid (CAS 90691-08-0)
- 2-(6,7-Dihydrothieno[3,2-c]pyridin-5(4H)-yl)acetic acid (CAS 926248-27-3)
- 2,3-Dihydrothieno[3,4-b][1,4]dioxine-5,7-dicarbaldehyde (CAS 211235-87-9)
Recommended Standards
- 4-Nitrothieno[2,3-b]pyridine 7-oxide (CAS 25557-51-1)
- 5-(2-Thiazolyl)isoxazole-3-carboxylic Acid (CAS 933759-69-4)
- 4-Fluoro-2-methoxycinnamic acid (CAS 682804-98-4)
- 5-Nitro-1,3-dihydro-2,1-benzothiazol-3-one (CAS 63285-88-1)
- 3-(Chlorocarbonyl)-4-thiazolidinecarboxylic acid methyl ester (CAS 94134-48-2)
- (4-Ethylpiperazin-1-yl)(2-(furan-2-yl)quinolin-4-yl)methanone (CAS 546073-40-9)
- Methyl 2-(2-bromo-4-cyano-5-methylphenyl)acetate (CAS 1805190-10-6)
- 4-Acetoxy-4-propylbenzophenone (CAS 890099-72-6)
- 4-Mercaptocinnamic Acid (CAS 155378-75-9)
- Benzyl ((1-(2-hydroxyethyl)pyrrolidin-2-yl)methyl)(methyl)carbamate (CAS 1353981-33-5)
- 3-Cyclobutyl-1,4-thiazepane (CAS 1781164-65-5)
- 1h-pyrrolo[2,3-b]pyridine-5-carboxaldehyde, 4-chloro- 4-chloro-1h-pyrrolo[2,3-b]pyridine-5-carbaldehyde 4-chloro-1h-pyrrolo[2,3-b]pyridine-5-carboxaldehyde, 4-chloro-5-formyl-1h-pyrrolo[2,3-b]pyridine 4-chloro-7-azaindole-5-carboxaldehyde 4-chloro1h-pyrrolo[2,3-b]pyridine-5-carboxaldehyde 958230-19-8 anti-N-Cbz-7-hydroxy-2-azabicyclo[2.2.1]heptane (CAS 958230-19-8)
- (2-Iodo-6-methylpyridin-4-yl)methanamine (CAS 1393533-43-1)
- Immunstimulating Peptide, human (CAS 94773-24-7)
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