Entecavir Impurity 63 CAS CATO-C4X-107763
| CAS No. | CATO-C4X-107763 |
| Molecular Formula | C32H33N5O4 |
| Molecular Weight | 551.64 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 551.64 g/mol gives Entecavir Impurity 63 distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
As a process- or degradation-related impurity, Entecavir Impurity 63 (CAS CATO-C4X-107763, C32H33N5O4) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
The molecular framework of Entecavir Impurity 63 (C32H33N5O4) is characterized by a nitrogen-containing heterocyclic scaffold, an amide 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).
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 | C32H33N5O4 |
| Molecular Weight | 551.64 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | >95% |
| Storage | Store in a cool place (≤25°C), protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 19.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 5 |
Related Entecavir Standards
- Entecavir Impurity 18 (CAS CATO-C4X-107718)
- Entecavir Impurity 60 (CAS 142217-77-4)
- Entecavir Impurity 61 (CAS 1907700-40-6)
- Entecavir Impurity 62 (CAS CATO-C4X-107762)
- Entecavir Impurity 64 (CAS CATO-C4X-107764)
- Entecavir Impurity 69 (CAS CATO-C4X-107769)
- Entecavir Impurity 85 (CAS CATO-C4X-107785)
- Entecavir Intermediates â…§ (CAS 204845-95-4)
Recommended Standards
- Besudil Impurity 4 (CAS CATO-C4X-29884)
- Akti-1/2 (CAS 612847-09-3)
- Besudil Impurity 5 (CAS CATO-C4X-29885)
- Nifekalant impurity 4 (CAS CATO-C4X-27974)
- Fulvestrant impurity 56 (CAS CATO-C4X-191756)
- Atorvastatin Impurity 22 (CAS 1035205-25-4)
- Somatostatin Impurity 5 X TFA Salt (CAS CATO-C4X-23505)
- Cabergoline Impurity 13 (CAS CATO-C4X-277413)
- 5-(Bromomethyl)-4-methylthiazole hydrobromide (CAS 1256562-26-1)
- (S)-1-((S)-4,4-Difluoro-1-methylpyrrolidin-2-yl)ethan-1-ol (CAS 2850326-76-8)
- 7-Bromo-2-chloroquinoline-3-carbaldehyde (CAS 136812-31-2)
- (R)-1-methoxy-N-methylpropan-2-amine (CAS 955428-50-9)
- 2-(Difluoromethyl)-3,5-dihydroxypyridine-6-carboxaldehyde (CAS 1804698-20-1)
- Angiotensin II Antipeptide (CAS 121379-63-3)
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