Estriol Impurity 19 CAS CATO-C4X-163719
| CAS No. | CATO-C4X-163719 |
| Molecular Formula | C22H26O5 |
| Molecular Weight | 370.44 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies Estriol Impurity 19 (CAS CATO-C4X-163719), a pharmacopoeial impurity reference standard (molecular formula C22H26O5, MW 370.44 g/mol) used for the identification and quantification of trace impurities in APIs.
Based on its molecular formula C22H26O5, Estriol Impurity 19 contains a flavonoid core, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 370.44 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).
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.
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 | C22H26O5 |
| Molecular Weight | 370.44 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 10.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
Related Estriol Standards
- Estriol impurity 23 (CAS 1247-47-8)
- Estriol 3-Sulfate (CAS 481-95-8)
- Estriol 16,17-Diacetate (CAS 805-26-5)
- Estriol Impurity 18 (CAS CATO-C4X-163718)
- Estriol Impurity 14 (CAS 1497406-77-5)
- Estriol 3-Benzyl Ether (CAS 18650-87-8)
- Estriol Impurity 21 (CAS CATO-C4X-163721)
- Estriol 3-Succinate (CAS 47575-61-1)
Recommended Standards
- Naltrexone impurity 35 (CAS CATO-C4X-147535)
- Metoprolol Impurity 46 (CAS CATO-C4X-136746)
- Ramipril EP Impurity K (CAS 108736-10-3)
- N-Nitroso Propafenone (CAS 3036581-87-7)
- Dabigatran Impurity 107 (CAS CATO-C4X-1089107)
- Donepezil Impurity 59 (CAS 120013-57-2)
- Vortioxetine Impurity 35 (CAS 1293489-69-6)
- 3-Ethyl-4-methyl-5-(methylthio)isoxazole (CAS 118631-13-3)
- 2-Amino-4-(furan-2-yl)-6-morpholinopyridine-3,5-dicarbonitrile (CAS 924901-33-7)
- 2-Amino-3-(tert-butyl)benzamide (CAS 1885-71-8)
- 2-Chloroquinoxalin-5-amine (CAS 1506077-04-8)
- 3-((dimethylcarbamoyl)oxy)-1-isopropylpyridin-1-ium bromide (CAS 69440-43-3)
- Methyl N-(tert-butoxycarbonyl)-O-methyl-D-serinate (CAS 862372-14-3)
- Semaglutide impurity 57 (CAS 2773558-06-6)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com