Allopurinol impurity 25 CAS 2303964-80-7
| CAS No. | 2303964-80-7 |
| Molecular Formula | C4H6N2O3 |
| Molecular Weight | 130.10 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
CATO supplies Allopurinol impurity 25 (CAS 2303964-80-7), a pharmacopoeial impurity reference standard (molecular formula C4H6N2O3, MW 130.10 g/mol) used for the identification and quantification of trace impurities in APIs.
Based on its molecular formula C4H6N2O3, Allopurinol impurity 25 contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 130.10 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
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 | C4H6N2O3 |
| Molecular Weight | 130.10 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) | 3.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1999 |
| Nitrogen Atoms | 2 |
Related Allopurinol Standards
- Allopurinol impurity 17 (CAS CATO-C4X-145817)
- Allopurinol EP Impurity A (CAS 5334-31-6)
- Allopurinol (CAS 315-30-0)
- Allopurinol-D2 (CAS 916979-34-5)
- Allopurinol-13C3-15N (CAS CATO-C4X-145833)
- Allopurinol Impurity 9 (CAS 41621-10-7)
- Allopurinol impurity 15 (CAS CATO-C4X-145815)
- Allopurinol impurity 24 (CAS 777835-45-7)
Recommended Standards
- Piracetam impurity 25 (CAS CATO-C4X-123525)
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- Cytarabine Impurity 32 (CAS 84902-98-7)
- Lovastatin Impurity 18 (CAS CATO-C4X-168418)
- Bempedoic Acid Impurity 38 (CAS 89541-21-9)
- Capivasertib Impurity 30 (CAS CATO-C4X-331230)
- 4-Bromo-3-phenyl-1h-pyrazole-5-carboxylic acid (CAS 1238384-46-7)
- 2-(1-methyl-1H-imidazol-2-yl)acetic acid (CAS 118054-54-9)
- Methyl 3-(3-(trifluoromethoxy)phenyl)isonicotinate (CAS 1261749-20-5)
- 3-(4-(Trifluoromethyl)phenyl)oxetan-3-ol (CAS 26755-29-3)
- Methyl 4-((tert-butoxycarbonyl)amino)-6-chloro-5-fluoronicotinate (CAS 2621932-26-9)
- 3-(6-Amino-8-bromo-9H-purin-9-yl)propyl acetate (CAS 839725-89-2)
- HA Peptide (CAS 92000-76-5)
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