Estriol Impurity 15 CAS CATO-C4X-163715
| CAS No. | CATO-C4X-163715 |
| Molecular Formula | C22H29NO7 |
| Molecular Weight | 419.47 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 419.47 g/mol gives Estriol Impurity 15 distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
CATO supplies Estriol Impurity 15 (CAS CATO-C4X-163715), a pharmacopoeial impurity reference standard (molecular formula C22H29NO7, MW 419.47 g/mol) used for the identification and quantification of trace impurities in APIs.
The molecular framework of Estriol Impurity 15 (C22H29NO7) is characterized by a flavonoid core, 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).
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 | C22H29NO7 |
| Molecular Weight | 419.47 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at room temperature, 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) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 1 |
Related Estriol Standards
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