Entecavir Impurity 83 CAS CATO-C4X-107783
| CAS No. | CATO-C4X-107783 |
| Molecular Formula | C13H16O3 |
| Molecular Weight | 220.26 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Entecavir Impurity 83 (CAS CATO-C4X-107783) is a certified pharmaceutical impurity reference standard with the molecular formula C13H16O3 and a molecular weight of 220.26 g/mol.
Based on its molecular formula C13H16O3, Entecavir Impurity 83 contains 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 220.26 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).
Recommended for quantitative analysis by HPLC, GC, LC-MS/MS, or GC-MS as an external calibration standard; it can also be used for spiked-recovery experiments, LOD/LOQ determination, and LC-MS/MS multiple-reaction-monitoring (MRM) calibration.
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 | C13H16O3 |
| Molecular Weight | 220.26 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
Related Entecavir Standards
- Entecavir Impurity 24 (CAS 117641-39-1)
- Entecavir Impurity 84 (CAS CATO-C4X-107784)
- Entecavir Intermediate â… (CAS 188399-48-6)
- Entecavir Impurity 33 (CAS 110567-21-0)
- Entecavir Impurity 44 (CAS 39939-07-6)
- Entecavir Impurity 45 (CAS 1803833-41-1)
- Entecavir (CAS 142217-69-4)
- Entecavir EP Impurity D (CAS 1367369-80-9)
Recommended Standards
- Pitavastatin Impurity 80 (CAS CATO-C4X-103780)
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- Ibuprofen EP Impurity J (CAS CATO-C4X-1082148)
- Ropinirole Impurity 5 (CAS CATO-C4X-17455)
- Celecoxib Impurity 68 (CAS 170569-91-2)
- Ponatinib Impurity 49 (CAS 1952344-01-2)
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- 15-(4-Methyltrityl)-4,7,10,13-tetraoxapentadecanoic acid (CAS 1864014-14-1)
- 2-Amino-3,5-dibromo-6-chlorobenzoic acid (CAS 143769-25-9)
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