Urapidil Impurity 73 CAS 21236-97-5
| CAS No. | 21236-97-5 |
| Molecular Formula | C5H7N3O2 |
| Molecular Weight | 141.13 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including Urapidil Impurity 73.
Urapidil Impurity 73 (CAS 21236-97-5) is a certified pharmaceutical impurity reference standard with the molecular formula C5H7N3O2 and a molecular weight of 141.13 g/mol.
Urapidil Impurity 73 (C5H7N3O2) contains an amino-acid-derived structure, an amide group, a hydroxyl group, an ether linkage. It is notably hygroscopic, the carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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.
As a certified reference material (CRM), Urapidil Impurity 73 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 | C5H7N3O2 |
| Molecular Weight | 141.13 g/mol |
| Purity | >95% |
| 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) | 4.0 |
| UV Absorption | UV-absorbing |
| CAS Registry Year (est.) | 1963 |
| Nitrogen Atoms | 3 |
Related Urapidil Standards
- Urapidil Impurity 38 (CAS CATO-C4X-192438)
- Urapidil Impurity N16 (CAS 874-14-6)
- Urapidil Impurity 75 (CAS 116315-12-9)
- Urapidil Impurity 31 (CAS 40226-15-1)
- Urapidil Impurity 25 (CAS 63959-47-7)
- Urapidil Impurity 33 (CAS 39615-79-7)
- Urapidil Impurity N62 (CAS 41949-07-9)
- Urapidil Impurity 108 (CAS CATO-C4X-1924108)
Recommended Standards
- Relugolix Impurity 66 (CAS CATO-C4X-242966)
- Minoxidil Impurity 10 (CAS 79459-04-4)
- Ensitrelvir Impurity 5 (CAS 57031-66-0)
- Allopurinol Impurity 9 (CAS 41621-10-7)
- Rosuvastatin Impurity 89 (CAS CATO-C4X-116989)
- Sodium Cromoglicate Impurity C51 (CAS 16130-17-9)
- Esomeprazole Impurity 114 (CAS CATO-C4X-1112114)
- Benzyl 2-((3-cyano-4-(2-methoxyphenyl)-6-oxo-1,4,5,6-tetrahydropyridin-2-yl)thio)acetate (CAS 312508-07-9)
- 1,3,5-Tris(1,1-dimethylethyl)hexahydro-1,3,5-triazine (CAS 10560-39-1)
- (4-Amino-3-chloro-6-(difluoromethyl)pyridin-2-yl)methanol (CAS 1806794-55-7)
- 2-Amino-N-[3-(dimethylamino)propyl]acetamidedihydrochloride (CAS 1220029-29-7)
- 2-(4-Bromophenyl)-5-methylthiophene (CAS 85093-02-3)
- Digoxin-d3 (CAS CATO-CP126103)
- ([13C6]Leu14)-Glucagon (1-29) (human, rat, porcine) trifluoroacetate salt (CAS 1802078-39-2)
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