Urapidil Impurity 17 CAS 34661-85-3
| CAS No. | 34661-85-3 |
| Molecular Formula | C21H31N5O3 |
| Molecular Weight | 401.50 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
Urapidil Impurity 17 (CAS 34661-85-3) is a certified pharmaceutical impurity reference standard with the molecular formula C21H31N5O3 and a molecular weight of 401.50 g/mol.
The molecular framework of Urapidil Impurity 17 (C21H31N5O3) is characterized by a steroid core, an amide group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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.
Physical & Chemical Properties
| Molecular Formula | C21H31N5O3 |
| Molecular Weight | 401.50 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| 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 |
| Degree of Unsaturation (DBE) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1966 |
| Nitrogen Atoms | 5 |
Related Urapidil Standards
- Urapidil Impurity 49 (CAS CATO-C4X-192449)
- Urapidil Impurity 57 (CAS CATO-C4X-192457)
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- Urapidil Impurity 10 (CAS CATO-C4X-192410)
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Recommended Standards
- Tandospirone Impurity 14 (CAS CATO-C4X-187514)
- Fexofenadine Impurity 20 (CAS 96067-93-5)
- Tebipenem Pivoxil Impurity P9 (CAS 1595319-82-6)
- Bilastine Impurity 74 (CAS CATO-C4X-225374)
- Hydroxychloroquine Impurity 33 (CAS 74509-79-8)
- Desloratadine Impurity 46 (CAS CATO-C4X-143046)
- Flurbiprofen Impurity 88 (CAS 1915720-16-9)
- tert-Butyl ((1S,3R,4S)-3-amino-4-(hydroxymethyl)cyclopentyl)carbamate (CAS 2455426-42-1)
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- (2S)-2-Amino-N-ethyl-N-((1-methylpyrrolidin-3-yl)methyl)propanamide (CAS 1354028-19-5)
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- CGS-12066 (maleate salt) (CAS 1350965-83-1)
- 18:1 BDP (S,S) (CAS 1246298-28-1)
- PACAP-Related Peptide (PRP), rat (CAS 132769-35-8)
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