Clarithromycin Impurity 21 CAS CATO-C4X-100221
| CAS No. | CATO-C4X-100221 |
| Molecular Formula | C39H71NO13 |
| Molecular Weight | 761.98 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
Structurally, Clarithromycin Impurity 21 (C39H71NO13) contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 5.0, corresponding to approximately 5 ring(s) or double-bond equivalent(s). With a molecular weight of 761.98 g/mol, it falls into the high-molecular-weight range. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
CATO supplies Clarithromycin Impurity 21 (CAS CATO-C4X-100221), a pharmacopoeial impurity reference standard (molecular formula C39H71NO13, MW 761.98 g/mol) used for the identification and quantification of trace impurities in APIs.
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 | C39H71NO13 |
| Molecular Weight | 761.98 g/mol |
| Purity | 97%+ |
| Storage | Store at room temperature, 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) | 5.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 1 |
Related Clarithromycin Standards
- Clarithromycin EP Impurity E (CAS 81103-14-2)
- Clarithromycin EP Impurity F (CAS 128940-83-0)
- Clarithromycin EP Impurity P (CAS 123967-58-8)
- Clarithromycin EP Impurity H (CAS 127140-69-6)
- Clarithromycin 9-Oxime (CAS 103450-87-9)
- Clarithromycin EP Impurity C (CAS 127253-06-9)
- Clarithromycin EP Impurity L (CAS 127253-05-8)
- Clarithromycin EP Impurity A (CAS 124412-58-4)
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- Semaglutide impurity 247 (CAS CATO-C4X-2226247)
Why CATO?
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