Estradiol Impurity 51 CAS 165609-57-4

Purity 97%+In StockPharmacopoeial Impurity Standards
CAS No.165609-57-4
Molecular FormulaC19H24O2
Molecular Weight284.39 g/mol
CategoryPharmacopoeial Impurity Standards / EP Impurities
AvailabilityIn Stock

Chemical Structure

Estradiol Impurity 51 CAS 165609-57-4 chemical structure

Description

Estradiol Impurity 51 (CAS 165609-57-4) is a certified pharmaceutical impurity reference standard with the molecular formula C19H24O2 and a molecular weight of 284.39 g/mol.

Owing to a steroid core, a hydroxyl group, an ether linkage, Estradiol Impurity 51 is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 284.39 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The high carbon-to-hydrogen ratio imparts good lipophilicity, allowing liquid-liquid extraction with non-polar solvents such as n-hexane or ethyl acetate.

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 manufactures Estradiol Impurity 51 under ISO 17034:2016 accreditation with dual CNAS and ANAB accreditation. Each batch is characterized by orthogonal methods and supplied with a full Certificate of Analysis (COA), ensuring metrological traceability.

Physical & Chemical Properties

Molecular FormulaC19H24O2
Molecular Weight284.39 g/mol
AppearancePale yellow to yellow crystalline powder
Purity97%+
StorageStore at 2-8°C, protect from light
Solubility (reference)Soluble in chloroform, dichloromethane, ethyl acetate, DMSO
StabilityMay oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light
Degree of Unsaturation (DBE)8.0
UV AbsorptionUV-absorbing
Structural FeaturesAromatic ring present
CAS Registry Year (est.)2004

Related Estradiol Standards

Recommended Standards

Why CATO?