Paricalcitol Impurity 21 CAS CATO-C4X-138721

Purity 97%+In StockPharmacopoeial Impurity Standards
CAS No.CATO-C4X-138721
Molecular FormulaC19H34O2
Molecular Weight294.47 g/mol
CategoryPharmacopoeial Impurity Standards / EP Impurities
AvailabilityIn Stock

Chemical Structure

Paricalcitol Impurity 21 CAS CATO-C4X-138721 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.

CATO supplies Paricalcitol Impurity 21 (CAS CATO-C4X-138721), a pharmacopoeial impurity reference standard (molecular formula C19H34O2, MW 294.47 g/mol) used for the identification and quantification of trace impurities in APIs.

Based on its molecular formula C19H34O2, Paricalcitol Impurity 21 contains a carboxylic acid group, a hydroxyl group, an ether linkage; these features give the compound characteristic absorption bands in UV spectroscopy. The molecular weight of 294.47 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).

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 FormulaC19H34O2
Molecular Weight294.47 g/mol
Purity97%+
StorageStore at room temperature
Solubility (reference)Soluble in chloroform, dichloromethane, ethyl acetate, DMSO
StabilityMay oxidize slowly on prolonged air exposure
Degree of Unsaturation (DBE)3.0
UV AbsorptionUV-absorbing

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