Fenoterol Impurity 4 CAS 161040-25-1
| CAS No. | 161040-25-1 |
| Molecular Formula | C18H21NO4 |
| Molecular Weight | 315.36 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including Fenoterol Impurity 4.
Fenoterol Impurity 4 (CAS 161040-25-1) is a certified pharmaceutical impurity reference standard with the molecular formula C18H21NO4 and a molecular weight of 315.36 g/mol.
Structurally, Fenoterol Impurity 4 (C18H21NO4) contains a flavonoid core, an amide group, 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 315.36 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.
As a certified reference material (CRM), Fenoterol Impurity 4 meets the metrological traceability requirements of ISO/IEC 17025 laboratories. Batch-to-batch consistency is monitored via control charts to guarantee comparable assigned values across lots.
Physical & Chemical Properties
| Molecular Formula | C18H21NO4 |
| Molecular Weight | 315.36 g/mol |
| Appearance | Pale yellow to yellow crystalline powder |
| Purity | >90% |
| 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.) | 2003 |
| Nitrogen Atoms | 1 |
Related Fenoterol Standards
- Fenoterol EP Impurity A (S, R-Isomer) (CAS 391234-95-0)
- Fenoterol EP Impurity A(R,S-Isomer) (CAS 391234-97-2)
- Fenoterol (CAS 13392-18-2)
- Fenoterol EP Impurity B (Enantiomer Mixture) (CAS 699525-61-6)
- Fenoterol Impurity 6 (CAS CATO-C4X-20776)
- Fenoterol O-β-D-Glucuronide (CAS 61046-78-4)
- Fenoterol EP Impurity A HBr (CAS 38964-10-2)
- Fenoterol Hydrobromide Impurity B (CAS 3371-33-3)
Recommended Standards
- Oxycodone (CAS 76-42-6)
- Roxadustat Impurity 8 (CAS CATO-C4X-22138)
- Nitrendipine Impurity 15 (CAS CATO-C4X-183415)
- Felbinac Trometamol Impurity 2 (CAS CATO-C4X-33682)
- Bromfenac Impurity 21 (CAS CATO-C4X-200221)
- Fluocinolone Acetonide impurity 21 (CAS CATO-C4X-238121)
- Chlortetracycline Hydrochloride EP Impurity K (CAS CATO-C4X-233021)
- 1,1,1-Trifluoro-4-(4-methoxyphenyl)butan-2-one (CAS 221915-87-3)
- Cenobamate impurity 4 (CAS 1259059-68-1)
- 4-oxo-3,4-dihydro-2H-1-benzopyran-6-sulfonyl chloride (CAS 503470-40-4)
- 3-((2-Chloro-6-fluorobenzyl)thio)-1-phenyl-6,7-dihydro-5H-cyclopenta[c]pyridine-4-carbonitrile (CAS 439096-34-1)
- 4,4-Dimethoxybutanenitrile (CAS 14618-78-1)
- 4-Benzyl-5-phenylisoxazole-3-carboxylic acid (CAS 1352516-75-6)
- Liraglutide Impurity 19 TFA Salt (CAS CATO-C4X-199219)
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