Azithromycin Impurity 33 CAS CATO-C4X-100333

Purity 97%+In StockPharmacopoeial Impurity Standards
CAS No.CATO-C4X-100333
Molecular FormulaC36H65NO12
Molecular Weight703.90 g/mol
CategoryPharmacopoeial Impurity Standards / EP Impurities
AvailabilityIn Stock

Chemical Structure

Azithromycin Impurity 33 CAS CATO-C4X-100333 chemical structure

Description

As a certified reference material (CRM), Azithromycin Impurity 33 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.

Azithromycin Impurity 33 (CAS CATO-C4X-100333) is a certified pharmaceutical impurity reference standard with the molecular formula C36H65NO12 and a molecular weight of 703.90 g/mol.

Azithromycin Impurity 33 (C36H65NO12) contains a nitrogen-containing heterocyclic scaffold, an amide group, a hydroxyl group, an ether linkage. The carboxyl group imparts weak acidity; these physicochemical properties determine the optimal preparation and storage of its standard solutions. 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).

This reference standard supports related-substances testing and method development in line with ICH Q3A/Q3B guidance on impurity control, and is suitable for system suitability testing and forced-degradation studies.

Physical & Chemical Properties

Molecular FormulaC36H65NO12
Molecular Weight703.90 g/mol
Purity97%+
StorageStore at room temperature, protect from light, keep sealed and dry
Solubility (reference)Soluble in methanol, acetonitrile, DMSO, water (slightly soluble)
StabilityMay oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light
Degree of Unsaturation (DBE)5.0
UV AbsorptionUV-absorbing
Structural FeaturesAromatic ring present
Nitrogen Atoms1

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