Captopril EP Impurity D CAS 56970-78-6

Purity >90%In StockPharmacopoeial Impurity Standards
CAS No.56970-78-6
Molecular FormulaC4H7BrO2
Molecular Weight167.00 g/mol
CategoryPharmacopoeial Impurity Standards / EP Impurities
AvailabilityIn Stock

Chemical Structure

Captopril EP Impurity D CAS 56970-78-6 chemical structure

Description

As a certified reference material (CRM), Captopril EP Impurity D 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.

CATO supplies Captopril EP Impurity D (CAS 56970-78-6), a pharmacopoeial impurity reference standard (molecular formula C4H7BrO2, MW 167.00 g/mol) used for the identification and quantification of trace impurities in APIs.

Based on its molecular formula C4H7BrO2, Captopril EP Impurity D contains a carboxylic acid group, a hydroxyl group, an ether linkage, bromine substitution; these features give the compound characteristic functional-group stretching vibrations in infrared spectroscopy. The molecular weight of 167.00 g/mol is directly relevant to the identification of the molecular ion in mass spectrometry. Halogen substitution (F/Cl/Br/I) produces a distinctive isotope pattern in mass spectrometry, a valuable aid for qualitative confirmation.

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 FormulaC4H7BrO2
Molecular Weight167.00 g/mol
Purity>90%
StorageStore at 2-8°C, keep tightly closed to prevent evaporation
Solubility (reference)Soluble in methanol, acetonitrile, DMSO, water (slightly soluble)
StabilityContains ester bond; hydrolyzes under strong alkaline conditions
Degree of Unsaturation (DBE)1.0
CAS Registry Year (est.)1973
Halogen ContentBr-containing

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