Betamethasone impurity 73 CAS 1203841-43-3
| CAS No. | 1203841-43-3 |
| Molecular Formula | C21H27FO4 |
| Molecular Weight | 362.44 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies Betamethasone impurity 73 (CAS 1203841-43-3), a pharmacopoeial impurity reference standard (molecular formula C21H27FO4, MW 362.44 g/mol) used for the identification and quantification of trace impurities in APIs.
Based on its molecular formula C21H27FO4, Betamethasone impurity 73 contains a flavonoid core, a hydroxyl group, an ether linkage, fluorine substitution; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 362.44 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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.
CATO manufactures Betamethasone impurity 73 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.
Physical & Chemical Properties
| Molecular Formula | C21H27FO4 |
| Molecular Weight | 362.44 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor) |
| Purity | 97%+ |
| 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; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 8.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1990 |
| Halogen Content | F-containing |
Related Betamethasone Standards
- Betamethasone Impurity 128 (CAS CATO-C4X-1437128)
- Betamethasone Impurity 129 (CAS CATO-C4X-1437129)
- Betamethasone Impurity 50 (CAS 1203841-45-5)
- Betamethasone Impurity 75 (CAS CATO-C4X-143775)
- Betamethasone Impurity 94 (CAS 19784-87-3)
- Betamethasone EP Impurity J (CAS 18383-24-9)
- Betamethasone EP Impurity C (CAS 13504-15-9)
- Betamethasone EP Impurity F (CAS 330157-04-5)
Recommended Standards
- Raloxifene Impurity 3 (CAS 1677681-02-5)
- Desmethyl Fluorometholone (CAS 426-20-0)
- Bilastine impurity 105 (CAS 2052955-68-5)
- Nilotinib Impurity 13 (CAS CATO-C4X-125613)
- Upadacitinib Impurity 51 (CAS 2270173-65-2)
- Lefamulinum Impurity 3 (CAS CATO-C4X-30473)
- Regorafenib Impurity 21 (CAS 88330-63-6)
- 4-(4-Hydroxyphenoxy)benzoic acid (CAS 500-76-5)
- 9-(4''-Chloro-[1,1':4',1''-terphenyl]-4-yl)-9H-carbazole (CAS 1663490-99-0)
- 5-Phenoxy-6-phenyl-3-(pyridin-2-yl)-1,2,4-triazine (CAS 866130-93-0)
- 3-Amino-3-(2-bromo-4-chlorophenyl)propanoic acid (CAS 299166-38-4)
- n-((3-Methylpyridin-2-yl)methyl)-9h-purin-6-amine (CAS 1333786-16-5)
- 1-(Thiophen-2-yl)pentane-1,4-dione (CAS 59086-28-1)
- 69558-55-0 O3Y80ZF13F Thymopentin Thymopentin [USAN:INN:BAN] L-Tyrosine, N-(N-(N-(N2-L-arginyl-L-lysyl)-L-alpha-aspartyl)-L-valyl)- L-Tyrosine, N-(N-(N-(N(sup 2)-L-arginyl-L-lysyl)-L-alpha-aspartyl)-L-valyl)- Thymopentine [French] Thymopentinum [Latin] Timopentina [Spanish] Thymopoietin 32-36 TP-5 Thymopoietin pentapeptide ORF-15244 Thymopentine Thymopentinum Timopentina ORF 15244 UNII-O3Y80ZF13F (CAS 69558-55-0)
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