Letermovir impurity 118 CAS 2758792-75-3
| CAS No. | 2758792-75-3 |
| Molecular Formula | C36H34F4N4O4 |
| Molecular Weight | 662.67 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 662.67 g/mol gives Letermovir impurity 118 distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
Letermovir impurity 118 (CAS 2758792-75-3) is a certified pharmaceutical impurity reference standard with the molecular formula C36H34F4N4O4 and a molecular weight of 662.67 g/mol.
Structurally, Letermovir impurity 118 (C36H34F4N4O4) contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, fluorine substitution. The molecule exhibits a degree of unsaturation (DBE) of 20.0, corresponding to approximately 20 ring(s) or double-bond equivalent(s). With a molecular weight of 662.67 g/mol, it falls into the high-molecular-weight range. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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 | C36H34F4N4O4 |
| Molecular Weight | 662.67 g/mol |
| 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) | 20.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2002 |
| Halogen Content | F-containing |
| Nitrogen Atoms | 4 |
Related Letermovir Standards
- Letermovir impurity 119 (CAS 2864441-61-0)
- Letermovir Impurity 120 (CAS CATO-C4X-2915120)
- Letermovir Impurity 36 (CAS CATO-C4X-291536)
- Letermovir Impurity 32 (CAS 2994645-03-1)
- (R)-Letermovir Ethyl Ester (CAS CATO-C4X-291535)
- Letermovir Impurity 41 (CAS CATO-C4X-291541)
- Letermovir Impurity 24 (CAS CATO-C4X-291524)
- Letermovir Impurity 23 (CAS CATO-C4X-291523)
Recommended Standards
- 7,12-Bis(2,2-Difluoroethenyl)-3,8,13,17-Tetramethyl-21H,23H-Porphine-2,18-Dipropanoic Acid Dimethyl Ester (CAS 123279-53-8)
- 4,4',4''-(((Nitrilotris(methylene))tris(1H-1,2,3-triazole-4,1-diyl))tris(methylene))tribenzoic acid (CAS 1093949-56-4)
- Azadirachtin H (CAS 134788-15-1)
- Chitotetrose (CAS 5567-52-2)
- Gatifloxacin Impurity 20 (CAS 55556-94-0)
- Mianserin impurity 40 (CAS CATO-C4X-136940)
- Noradrenaline EP Impurity E (CAS 99-40-1)
- Atropine EP Impurity B HCl (CAS 75559-01-2)
- Epi-Galantamine N-Oxide (CAS 366485-18-9)
- Mesalazine Impurity N1 (CAS 5794-62-7)
- 2-Amino-5-chloro-6-fluoro-3-iodobenzonitrile (CAS 1000577-85-4)
- 2-[5-(4-aminophenyl)-2h-1,2,3,4-tetrazol-2-yl]-1-(pyrrolidin-1-yl)ethan-1-one (CAS 436092-94-3)
- 2,4-Bis(trifluoromethyl)cyclohexanamine (CAS 65934-73-8)
- Semaglutide impurity 50 (CAS 2773558-66-8)
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