Azithromycin Impurity 38 CAS CATO-C4X-100338
| CAS No. | CATO-C4X-100338 |
| Molecular Formula | C36H64N2O12 |
| Molecular Weight | 716.90 g/mol |
| Category | Pharmacopoeial Impurity Standards / EP Impurities |
| Availability | In Stock |
Chemical Structure
Description
As a process- or degradation-related impurity, Azithromycin Impurity 38 (CAS CATO-C4X-100338, C36H64N2O12) is essential for impurity profiling, related-substances testing, and forced-degradation studies in pharmaceutical development.
Owing to a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage, Azithromycin Impurity 38 is typically off-white to pale yellow amorphous powder. Its solid-state physicochemical attributes — including a molecular weight of 716.90 g/mol — guide the selection of appropriate sample preparation and analytical techniques. Nitrogen-containing functional groups confer excellent ionization efficiency in positive-ion electrospray (ESI) mode, making the compound well suited to LC-MS/MS analysis.
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 | C36H64N2O12 |
| Molecular Weight | 716.90 g/mol |
| Purity | 97%+ |
| Storage | Store in a cool place (≤25°C), protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening |
| Degree of Unsaturation (DBE) | 6.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| Nitrogen Atoms | 2 |
Related Azithromycin Standards
- Azithromycin impurity 62 (CAS 857078-26-3)
- Azithromycin EP Impurity N (CAS 612069-25-7)
- Azithromycin Impurity 34 (CAS CATO-C4X-100334)
- Azithromycin EP Impurity E (CAS 612069-27-9)
- Azithromycin impurity 22 (CAS CATO-C4X-100322)
- Azithromycin Impurity 33 (CAS CATO-C4X-100333)
- Azithromycin CP Impurity Q (CAS 99290-97-8)
- Azithromycin CP Impurity R (CAS 161193-44-8)
Recommended Standards
- Erythromycin thiocyanate impurity B rearranged derivative (CAS CATO-C4X-100174)
- 4,4-((1E,1E)-Anthracene-9,10-diylbis(ethene-2,1-diyl))bis(N,N-diphenylaniline) (CAS 155139-11-0)
- Erythromycin C rearranged derivatives (CAS CATO-C4X-100171)
- N1,N1,N4,N4-Tetra([1,1'-biphenyl]-4-yl)benzene-1,4-diamine (CAS 164724-33-8)
- Revefenacin Impurity 70 (CAS CATO-C4X-203170)
- Prednisolone impurity 64 (CAS 50557-66-9)
- Rimegepant Impurity 140 (CAS CATO-C4X-2487140)
- 3-(Pyridin-4-yl)pyrazine-2-carbonitrile (CAS 1511524-62-1)
- tert-Butyl 2-(3-(4-(3-hydroxypropoxy)butoxy)propoxy)acetate (CAS 2052306-04-2)
- 2,2-Difluoro-2-(3-methylpyridin-2-yl)acetic acid (CAS 1215474-10-4)
- 2-(2-Methylenebutyl)cycloheptan-1-ol (CAS 1465737-86-3)
- Dimethyl 1-(2-oxo-2-phenylethyl)-1H-1,2,3-triazole-4,5-dicarboxylate (CAS 869895-64-7)
- N-{[1-methyl-5-phenoxy-3-(trifluoromethyl)-1H-pyrazol-4-yl]methyl}thiophene-2-carboxamide (CAS 956754-18-0)
- A-18-F-NH2; Morphine Modulating Neuropeptide (CAS 99588-52-0)
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