Allopurinol EP Impurity A CAS 5334-31-6

Purity >95%In StockPharmacopoeial Impurity Standards
CAS No.5334-31-6
Molecular FormulaC4H6N4O
Molecular Weight126.12 g/mol
CategoryPharmacopoeial Impurity Standards / EP Impurities
AvailabilityIn Stock

Chemical Structure

Allopurinol EP Impurity A CAS 5334-31-6 chemical structure

Description

CATO supplies Allopurinol EP Impurity A (CAS 5334-31-6), a pharmacopoeial impurity reference standard (molecular formula C4H6N4O, MW 126.12 g/mol) used for the identification and quantification of trace impurities in APIs.

Based on its molecular formula C4H6N4O, Allopurinol EP Impurity A contains an amide group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 126.12 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. 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.

As a certified reference material (CRM), Allopurinol EP Impurity A 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 FormulaC4H6N4O
Molecular Weight126.12 g/mol
Purity>95%
StorageStore at 2-8°C, protect from light
Solubility (reference)Soluble in DMSO, DMF, methanol
StabilityLight-sensitive; avoid direct strong light
Degree of Unsaturation (DBE)4.0
UV AbsorptionUV-absorbing
CAS Registry Year (est.)1958
Nitrogen Atoms4

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