ent-Letermovir CAS 917389-37-8
| CAS No. | 917389-37-8 |
| Molecular Formula | C29H28F4N4O4 |
| Molecular Weight | 572.55 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
ent-Letermovir (CAS 917389-37-8), molecular formula C29H28F4N4O4 and molecular weight 572.55 g/mol, is a CATO reference standard with documented purity and traceability.
ent-Letermovir (C29H28F4N4O4) contains a steroid 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. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.
As a certified reference material (CRM), ent-Letermovir 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 | C29H28F4N4O4 |
| Molecular Weight | 572.55 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor, low volatility) |
| 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 16.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1987 |
| Halogen Content | F-containing |
| Nitrogen Atoms | 4 |
Related ent Standards
- rac-Letermovir, >98% (CAS 791116-51-3)
- Letermovir (CAS 917389-32-3)
- Letermovir Impurity 10 (CAS CATO-C4X-291510)
- Letermovir Impurity 103 (CAS CATO-C4X-2915103)
- Letermovir Impurity 19 (CAS CATO-C4X-291519)
- Letermovir Impurity 42 (CAS CATO-C4X-291542)
- Letermovir Impurity 44 (CAS CATO-C4X-291544)
- Letermovir Impurity 47 (CAS CATO-C4X-291547)
Recommended Standards
- Letermovir Impurity 63 (CAS CATO-C4X-291563)
- Letermovir Impurity 67 (CAS CATO-C4X-291567)
- Letermovir Impurity 70 (CAS CATO-C4X-291570)
- Letermovir Impurity 8 (CAS CATO-C4X-29158)
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- Semaglutide impurity 289 (CAS CATO-C4X-2226289)
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