Febuxostat impurity 126 CAS CATO-C4X-1162102

Purity 97%+In StockPharmacopoeial Impurity Standards
CAS No.CATO-C4X-1162102
Molecular FormulaC16H18N2O4S
Molecular Weight334.39 g/mol
CategoryPharmacopoeial Impurity Standards / EP Impurities
AvailabilityIn Stock

Chemical Structure

Febuxostat impurity 126 CAS CATO-C4X-1162102 chemical structure

Description

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.

Febuxostat impurity 126 (CAS CATO-C4X-1162102) is a certified pharmaceutical impurity reference standard with the molecular formula C16H18N2O4S and a molecular weight of 334.39 g/mol.

Structurally, Febuxostat impurity 126 (C16H18N2O4S) contains a flavonoid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage. The molecule exhibits a degree of unsaturation (DBE) of 9.0, corresponding to approximately 9 ring(s) or double-bond equivalent(s). With a molecular weight of 334.39 g/mol, it falls into the moderately-high-molecular-weight range. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).

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 FormulaC16H18N2O4S
Molecular Weight334.39 g/mol
Purity97%+
StorageStore at 2-8°C, protect from light, keep sealed and dry
Solubility (reference)Soluble in DMSO, DMF, methanol
StabilityMay oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening
Degree of Unsaturation (DBE)9.0
UV AbsorptionUV-absorbing
Structural FeaturesAromatic ring present
Nitrogen Atoms2
Sulfur Atoms1

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