Esmolol Impurity 55 CAS 33947-97-6
| CAS No. | 33947-97-6 |
| Molecular Formula | C14H21NO4 |
| Molecular Weight | 267.32 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.
CATO supplies Esmolol Impurity 55 (CAS 33947-97-6), a pharmacopoeial impurity reference standard (molecular formula C14H21NO4, MW 267.32 g/mol) used for the identification and quantification of trace impurities in APIs.
The molecular framework of Esmolol Impurity 55 (C14H21NO4) is characterized by a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
CATO manufactures Esmolol Impurity 55 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 | C14H21NO4 |
| Molecular Weight | 267.32 g/mol |
| Appearance | Off-white to pale yellow crystalline powder |
| Purity | >95% |
| 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; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 1966 |
| Nitrogen Atoms | 1 |
Related Esmolol Standards
- Esmolol Impurity 71 (CAS CATO-C4X-189171)
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- (R)-Esmolol Acid (CAS 910651-37-5)
- Esmolol Impurity 29 (CAS CATO-C4X-189129)
Recommended Standards
- Docetaxel Impurity 50 (CAS 154306-81-7)
- Erdosteine Impurity 10 (CAS 121213-21-6)
- Atenolol EP Impurity G (CAS 56392-14-4)
- Nifekalant impurity 5 (CAS CATO-C4X-27975)
- Avanafil Impurity 24 (CAS CATO-C4X-111824)
- Lenvatinib Impurity 42 (CAS 2733083-03-7)
- Daunorubicin Impurity N3 (CAS 32434-04-1)
- 5-Bromo-2-methoxy-4-(trifluoromethyl)pyridine (CAS 688047-09-8)
- Gibberellin A1 (CAS 545-97-1)
- 4-Chloro-2-methyl-1H-pyrazol-3(2H)-one (CAS 185451-44-9)
- [1-(4-Chlorophenyl)-2,5-dimethyl-1h-pyrrol-3-yl]methanol (CAS 676630-89-0)
- 1-Cyclopentyl-3-methylpiperazine (CAS 163526-35-0)
- Methyl 2-{5H-pyrimido[5,4-b]indol-4-ylsulfanyl}acetate (CAS 338419-82-2)
- D-[Phe]6-Semaglutide (CAS CATO-CPTD788633)
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