Ensifentrine impurity 23 CAS 43113-25-3
| CAS No. | 43113-25-3 |
| Molecular Formula | C20H16N2O5 |
| Molecular Weight | 364.35 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
As a process- or degradation-related impurity, Ensifentrine impurity 23 (CAS 43113-25-3, C20H16N2O5) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Owing to a flavonoid core, an amide group, a hydroxyl group, an ether linkage, Ensifentrine impurity 23 is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 364.35 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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).
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.
As a certified reference material (CRM), Ensifentrine impurity 23 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 | C20H16N2O5 |
| Molecular Weight | 364.35 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 DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 14.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1969 |
| Nitrogen Atoms | 2 |
Related Ensifentrine Standards
- Ensifentrine impurity 12 (CAS CATO-C4X-335312)
- Ensifentrine impurity 24 (CAS CATO-C4X-335324)
- Ensifentrine impurity 25 (CAS CATO-C4X-335325)
- Ensifentrine impurity 30 (CAS CATO-C4X-335330)
- Ensifentrine impurity 40 (CAS CATO-C4X-335340)
- Ensifentrine impurity 36 (CAS CATO-C4X-335336)
- Ensifentrine impurity 37 (CAS CATO-C4X-335337)
- Ensifentrine impurity 16 (CAS CATO-C4X-335316)
Recommended Standards
- Serotonin Impurity 13 (CAS 55747-60-9)
- Harpagide (CAS 6926-08-5)
- Serotonin Impurity 11 (CAS CATO-C4X-253411)
- 4-[6-(4-Methyl-piperazin-1-yl)-5-trifluoromethyl-pyridin-3-yl]-benzamide (CAS 1208081-11-1)
- Propofol Impurity 27 (CAS 20170-32-5)
- Enalapril Impurity 7 (CAS CATO-C4X-13347)
- Amoxicillin Impurity 94 (CAS CATO-C4X-114894)
- 1-(5-Phenyl-1H-pyrazol-1-yl)ethan-1-one (CAS 63478-75-1)
- 3,4-Diamino-N-(4-(2-(4-methylpiperazin-1-yl)ethyl)phenyl)benzamide (CAS 936940-80-6)
- 1-(5-Chlorothiophen-2-yl)-2-((4-methyl-4h-1,2,4-triazol-3-yl)thio)ethan-1-one (CAS 380550-33-4)
- OJL133898O 619-23-8 alpha-Chloro-m-nitrotoluene Benzene, 1-(chloromethyl)-3-nitro- alpha-Chloro-3-nitrotoluene m-Nitrobenzyl chloride Toluene, alpha-chloro-m-nitro- CCRIS 2324 1-(Chloromethyl)-3-nitrobenzene EINECS 210-586-1 HSDB 2680 3-Nitrobenzyl chloride NSC 9802 Toluene, alpha-chloro-3-nitro- UNII-OJL133898O (CAS 619-23-8)
- Ethyl 2-amino-5-(difluoromethyl)thiazole-4-carboxylate (CAS 1710293-58-5)
- n-(3,4-Dichlorophenyl)-4-methyl-2-(pyridin-2-yl)thiazole-5-carboxamide (CAS 400079-04-1)
- FMRF Amide Related Peptide. (CAS 149471-12-5)
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