Betamethasone Impurity N9 CAS 21720-47-8
| CAS No. | 21720-47-8 |
| Molecular Formula | C23H30O5 |
| Molecular Weight | 386.48 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
CATO supplies Betamethasone Impurity N9 (CAS 21720-47-8), a pharmacopoeial impurity reference standard (molecular formula C23H30O5, MW 386.48 g/mol) used for the identification and quantification of trace impurities in APIs.
Structurally, Betamethasone Impurity N9 (C23H30O5) contains a flavonoid core, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 9.0, corresponding to approximately 9 ring(s) or double-bond equivalent(s). With a molecular weight of 386.48 g/mol, it falls into the moderately-high-molecular-weight range. The presence of an aromatic ring or conjugated system gives the compound characteristic absorption bands in the UV-Vis region, making it well suited to UV or diode-array detection (DAD).
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.
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 | C23H30O5 |
| Molecular Weight | 386.48 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in methanol, acetonitrile, DMSO, water (slightly soluble) |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light |
| Degree of Unsaturation (DBE) | 9.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1963 |
Related Betamethasone Standards
- Betamethasone impurity 100 (CAS CATO-C4X-1437100)
- Betamethasone impurity 49 (CAS CATO-C4X-143749)
- Betamethasone Impurity 57 (CAS 1257544-85-6)
- Betamethasone impurity 61 (CAS 1257544-84-5)
- Betamethasone Impurity 124 (CAS 947382-36-7)
- Betamethasone Impurity 22 (CAS 2990-65-0)
- Betamethasone EP Impurity H (CAS 185613-71-2)
- Betamethasone Impurity 117 (CAS CATO-C4X-1437117)
Recommended Standards
- Ankaflavin (CAS 50980-32-0)
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- Sudan 4 D6 (naphthyl D6) (CAS 1014689-18-9)
- (R,S)-EtIn-Sabox (CAS 1092582-89-2)
- Imipenem Impurity 11 (CAS CATO-C4X-166211)
- Orforglipron impurity 72 (CAS CATO-C4X-323472)
- Bacitracin EP Impurity G (CAS 144572-54-3)
- 2-(2,4-Dichlorophenyl)-1h-indole (CAS 76869-15-3)
- Methyl 3-(2,3-dihydro-1H-pyrrolizin-5-yl)propanoate (CAS 61633-24-7)
- 1246819-30-6 4-Methyl-1-pentanol-d7 Anglamol 6085U-d7 Isohexanol-d7 NSC 91492-d7 iso-Hexanol-d7 (CAS 1246819-30-6)
- 4-Chloro-5h,6h,7h,8h,9h-pyrimido[4,5-d]azepine hydrochloride (CAS 1245642-58-3)
- tert-Butyl 3-(Trifluoromethyl)-2,5-dihydro-1H-pyrrole-1-carboxylate (CAS 693826-97-0)
- 7-Methylthieno[2,3-b]pyrazine-2,3(1H,4H)-dione (CAS 149587-33-7)
- Neuropeptide EI (human, mouse, rat) (CAS 125934-45-4)
Why CATO?
- ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
- 130,000+ catalog items in stock, COA supplied with every batch
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- Technical support: +86 18665070610 / Nicole.chen@cato-chem.com