Roxithromycin EP Impurity B Isomer CAS CATO-C4X-130321
| CAS No. | CATO-C4X-130321 |
| Molecular Formula | C33H62N2O12 |
| Molecular Weight | 678.85 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
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.
Roxithromycin EP Impurity B Isomer (CAS CATO-C4X-130321) is a certified pharmaceutical impurity reference standard with the molecular formula C33H62N2O12 and a molecular weight of 678.85 g/mol.
Based on its molecular formula C33H62N2O12, Roxithromycin EP Impurity B Isomer contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 678.85 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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 | C33H62N2O12 |
| Molecular Weight | 678.85 g/mol |
| Purity | 97%+ |
| 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) | 4.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 2 |
Related Roxithromycin Standards
- Roxithromycin EP Impurity B (CAS 214902-82-6)
- Roxithromycin Impurity 26 (CAS 134834-10-9)
- Roxithromycin EP Impurity H (CAS 425365-65-7)
- Roxithromycin EP Impurity E (CAS 1460313-66-9)
- Roxithromycin EP Impurity F (CAS 118267-18-8)
- Roxithromycin EP Impurity D (CAS 134931-00-3)
- Roxithromycin (CAS 80214-83-1)
- Roxithromycin EP Impurity J (CAS 134834-12-1)
Recommended Standards
- N2,N7-Diphenyl-N2,N7-di-m-tolyl-9,9'-spirobi[fluorene]-2,7-diamine (CAS 1033035-83-4)
- Cimiracemoside D (CAS 290821-39-5)
- N-([1,1'-Biphenyl]-4-yl)-9,9-dimethyl-N-(4-(9-phenyl-9H-carbazol-3-yl)phenyl)-9H-fluoren-2-amine (CAS 1242056-42-3)
- Simvastatin, 1-Pyreneacetyl Ester (CAS 193682-18-7)
- Flumetasone Impurity 19 (CAS CATO-C4X-191019)
- Miconazole EP Impurity G HCl (CAS 909277-71-0（free base）)
- Quetiapine EP Impurity I Fumarate (CAS CATO-C4X-124453)
- Ethyldiethynylphosphine oxide (CAS 2855112-40-0)
- 4-(3-Methylcyclohexylidene)-2-phenyloxazol-5(4H)-one (CAS 31882-39-0)
- 5-Iodo-7H-pyrrolo[2,3-d]pyrimidine-2-carboxylic acid (CAS 1638766-94-5)
- 1-(6-(Benzyl(methyl)amino)-4-methylpyridin-3-yl)propan-1-one (CAS 1355236-23-5)
- 4-Chloro-3-(4-methoxyphenyl)-6-(trifluoromethyl)-[1,2,3]triazolo[1,5-a]pyridine (CAS 1400872-35-6)
- 4-(4-Chlorobenzyl)-3-ethyl-6,7-dimethoxyisoquinoline (CAS 62334-41-2)
- Semaglutide Impurity 189 (CAS CATO-C4X-2226189)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
- Worldwide shipping with full export documentation (HS code guidance available)
- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com