Exemestane EP Impurity B CAS 184972-09-6
| CAS No. | 184972-09-6 |
| Molecular Formula | C20H26O3 |
| Molecular Weight | 314.42 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO manufactures Exemestane EP Impurity B under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.
CATO supplies Exemestane EP Impurity B (CAS 184972-09-6), a pharmacopoeial impurity reference standard (molecular formula C20H26O3, MW 314.42 g/mol) used for the identification and quantification of trace impurities in APIs.
Owing to a steroid core, a hydroxyl group, an ether linkage, Exemestane EP Impurity B is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 314.42 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.
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 | C20H26O3 |
| Molecular Weight | 314.42 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | >95% |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in chloroform, dichloromethane, ethyl acetate, DMSO |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2009 |
Related Exemestane Standards
- 6-beta-Exemestane EP Impurity B (CAS 121021-51-0)
- Exemestane Impurity 23 (CAS CATO-C4X-164123)
- Exemestane Impurity 6 (CAS 159354-61-7)
- Exemestane Impurity 33 (CAS CATO-C4X-164133)
- Exemestane Impurity 27 (CAS 600178-04-9)
- Exemestane Impurity 28 (CAS CATO-C4X-164128)
- Exemestane EP Impurity C (CAS 2130745-60-5)
- Exemestane Impurity 29 (CAS 49644-02-2)
Recommended Standards
- Estradiol Impurity 54 (CAS 1743-60-8)
- Estradiol Impurity 25 (CAS 4245-41-4)
- Norethisterone EP Impurity H (CAS 51724-44-8)
- Tamoxifen Impurity 25 (CAS CATO-C4X-123325)
- Indacaterol Impurity 56 HCl (CAS CATO-C4X-150056)
- Celecoxib Impurity 75 (CAS CATO-C4X-104375)
- Fludarabine Phosphate EP Impurity C (CAS 548774-53-4)
- (R)-Benzyl 2-(2-hydroxyethyl)piperidine-1-carboxylate (CAS 1000806-61-0)
- Benzyl 1,8-diazaspiro[4.6]undecane-8-carboxylate (CAS 1160246-79-6)
- Ethyl 5-[4-(Ethoxycarbonyl)phenyl]isoxazole-3-carboxylate (CAS 1820686-51-8)
- 1-Methylisoquinolin-3-amine (CAS 15787-16-3)
- 898758-79-7 Ethyl 5-[3-(acetyloxy)phenyl]-5-oxopentanoate DTXSID20645836 (CAS 898758-79-7)
- 1404194-28-0 4-[Chloro(difluoro)methoxy]-2-fluoro-benzonitrile (CAS 1404194-28-0)
- Semaglutide Impurity 186 (CAS CATO-C4X-2226186)
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