Letermovir Impurity 90 CAS CATO-C4X-291590
| CAS No. | CATO-C4X-291590 |
| Molecular Formula | C19H16F4N2O4 |
| Molecular Weight | 412.33 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Letermovir Impurity 90 (C19H16F4N2O4) contains a flavonoid core, an amide group, a hydroxyl group, an ether linkage, fluorine substitution. It is notably hygroscopic, halogen substitution raises its density and boiling point, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
CATO supplies Letermovir Impurity 90 (CAS CATO-C4X-291590), a pharmacopoeial impurity reference standard (molecular formula C19H16F4N2O4, MW 412.33 g/mol) used for the identification and quantification of trace impurities in APIs.
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.
As a certified reference material (CRM), Letermovir Impurity 90 meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C19H16F4N2O4 |
| Molecular Weight | 412.33 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor, low volatility) |
| Purity | 97%+ |
| 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Halogen Content | F-containing |
| Nitrogen Atoms | 2 |
Related Letermovir Standards
- Letermovir Impurity 132 (CAS CATO-C4X-2915132)
- Letermovir Impurity 71 (CAS CATO-C4X-291571)
- Letermovir Impurity 75 (CAS CATO-C4X-291575)
- Letermovir Impurity 83 (CAS CATO-C4X-291583)
- Letermovir Impurity 85 (CAS CATO-C4X-291585)
- Letermovir Impurity 92 (CAS CATO-C4X-291592)
- Letermovir Impurity 93 (CAS CATO-C4X-291593)
- Letermovir impurity 137 (CAS CATO-C4X-2915137)
Recommended Standards
- Trifludimoxazin (CAS 1258836-72-4)
- Ethyl 1-[4-(4-nitrophenyl)-1,3-thiazol-2-yl]-5-(trifluoromethyl)-1H-pyrazole-4-carboxylate (CAS 159885-64-0)
- 4-Bromo-N-tert-butyl-N-[(4-methoxyphenyl)methyl]benzene-1-sulfonamide (CAS 1881330-94-4)
- Dotinurad Impurity 23 (CAS CATO-C4X-249423)
- Etoricoxib impurity 55 (CAS 646459-40-7)
- Solifenacin Impurity 39 (CAS CATO-C4X-105339)
- Pazufloxacin Impurity 6 (CAS CATO-C4X-23326)
- 5,7-Dimethylindolin-2-one (CAS 729598-50-9)
- (R)-(3-Phenyl-4,5-dihydroisoxazol-5-yl)methanol (CAS 119897-89-1)
- 3-(4-Bromophenyl)-5-(2-chlorophenyl)-1,2,4-oxadiazole (CAS 404900-69-2)
- 2-(3-Bromophenoxy)-N-((tetrahydrothiophen-2-yl)methyl)ethan-1-amine hydrochloride (CAS 1797752-35-2)
- 2-(3-(tert-Butoxy)-3-oxoprop-1-en-1-yl)-5-phenylpyridine 1-oxide (CAS 1041859-78-2)
- 1-Chloro-2,5-dimethylhexane (CAS 128399-80-4)
- Semaglutide impurity 33 (CAS CATO-C4X-222633)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
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- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com