Zolpidem Tartrate EP Impurity B CAS CATO-C4X-148618
| CAS No. | CATO-C4X-148618 |
| Molecular Formula | C19H20BrN3O |
| Molecular Weight | 386.29 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Zolpidem Tartrate EP Impurity B (CAS CATO-C4X-148618) is a certified pharmaceutical impurity reference standard with the molecular formula C19H20BrN3O and a molecular weight of 386.29 g/mol.
Structurally, Zolpidem Tartrate EP Impurity B (C19H20BrN3O) contains a steroid core, an amide group, a hydroxyl group, an ether linkage, bromine substitution. 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 386.29 g/mol, it falls into the moderately-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.
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.
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 | C19H20BrN3O |
| Molecular Weight | 386.29 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 11.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Halogen Content | Br-containing |
| Nitrogen Atoms | 3 |
Related Zolpidem Standards
- Zolpidem Phenyl-4-carboxylic Acid Ethyl Ester (CAS 1026465-13-3)
- Zolpidem Impurity 22 (CAS CATO-C4X-148622)
- Zolpidem 6-Carboxylic Acid Methyl Ester (CAS 917252-81-4)
- Zolpidem-d6 Phenyl-4-carboxylic Acid (CAS 1189868-12-9)
- Zolpidem-d6 6-Carboxylic Acid (CAS 1190014-62-0)
- Zolpidem Impurity 19 (CAS CATO-C4X-148619)
- Zolpidem Impurity 20 (CAS CATO-C4X-148620)
- Zolpidem 6-Carboxylic Acid (CAS 109461-15-6)
Recommended Standards
- 2-{4-[(3,5-dichlorophenoxy)methyl]phenyl}-1,3-benzothiazole 400087-90-3 KS-00003E9H (CAS 400087-90-3)
- N-(3-bromophenyl)-1-(7,7-dimethyl-2-oxobicyclo[2.2.1]Heptan-1-yl)methanesulfonamide (CAS 133232-73-2)
- 5'-(4,4,5,5-Tetramethyl-1,3,2-dioxaborolan-2-yl)-[1,1':3',1''-terphenyl]-4,4''-diamine (CAS 2754262-59-2)
- Ethyl S-(3-bromo-2-hydroxypropyl)-N-(tert-butoxycarbonyl)cysteinate (CAS 1396996-67-0)
- Ashaconazole lmpurity 91 (CAS CATO-C4X-123691)
- Clofarabine Impurity 7 (CAS 10310-21-1)
- Dexamethasone impurity 91 (CAS CATO-C4X-116591)
- Ethyl 2-((2-chlorophenyl)amino)-5-methylthiazole-4-carboxylate (CAS 1772294-03-7)
- 2-(4-Bromo-2-chlorobenzyl)-4,4-dimethylisoxazolidin-3-one (CAS 81778-59-8)
- N'-(3-Allyl-4-oxothiazolidin-2-ylidene)benzohydrazide (CAS 402946-11-6)
- Ketoconazole Impurity 25 (CAS CATO-C4X-147225)
- Methyl 6-bromobenzo[d]isothiazole-3-carboxylate (CAS 1103500-71-5)
- (Pyridin-3-ylmethyl)urea (CAS 36226-32-1)
- D-Pro31-Tirzepatide (CAS CATO-CPTD788905)
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