Labetalol impurity 43 CAS CATO-C4X-246643
| CAS No. | CATO-C4X-246643 |
| Molecular Formula | C19H21N3O4 |
| Molecular Weight | 355.39 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
As a certified reference material (CRM), Labetalol impurity 43 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.
As a process- or degradation-related impurity, Labetalol impurity 43 (CAS CATO-C4X-246643, C19H21N3O4) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Structurally, Labetalol impurity 43 (C19H21N3O4) contains a flavonoid core, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 11.0, corresponding to approximately 11 ring(s) or double-bond equivalent(s). With a molecular weight of 355.39 g/mol, it falls into the moderately-high-molecular-weight range. 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).
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.
Physical & Chemical Properties
| Molecular Formula | C19H21N3O4 |
| Molecular Weight | 355.39 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) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 3 |
Related Labetalol Standards
- Labetalol Impurity 18 (CAS CATO-C4X-246618)
- Labetalol Impurity 49 (CAS CATO-C4X-246649)
- Labetalol Impurity 52 (CAS CATO-C4X-246652)
- Labetalol Impurity 53 (CAS 802620-01-5)
- Labetalol Impurity 82 (CAS CATO-C4X-246682)
- Labetalol Impurity 56 (CAS 2731858-23-2)
- Labetalol Impurity 45 (CAS CATO-C4X-246645)
- Labetalol Impurity 41 (CAS CATO-C4X-246641)
Recommended Standards
- Uridine Impurity 14 (CAS 872710-80-0)
- Belumosudil Impurity 33 (CAS 2121561-37-1)
- Uridine Impurity 13 (CAS 1221169-70-5)
- Enarodustat Impurity 4 (CAS CATO-C4X-32284)
- Gadoteridol Impurity 18 (CAS 68516-39-2)
- Mosapride Impurity 74 (CAS CATO-C4X-104474)
- Roxadustat Impurity 156 (CAS CATO-C4X-2213156)
- (3R)-3-(Bromomethyl)-2,3-dihydro-1,4-benzodioxine (CAS 1142953-55-6)
- 5’-(Benzyloxy)-2’-hydroxy-3’-nitroacetophenone (CAS 861841-94-3)
- (5-Methyl-2-oxo-1,2-dihydropyridin-4-yl)boronic acid (CAS 1225222-12-7)
- (2R)-2-(furan-2-yl)pyrrolidine (CAS 1039033-91-4)
- Ilaprazole Impurity 25 (CAS CATO-C4X-113025)
- 4-Amino-7-(2-deoxy-b-D-ribofuranosyl)-7H-pyrrolo[2,3-d]pyrimidin-5-carboxamide (CAS 83379-28-6)
- Semaglutide Impurity 164 (CAS CATO-C4X-2226164)
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