Ethinylestradiol EP Impurity A CAS 4717-38-8

Purity >95%In StockPharmacopoeial Impurity Standards
CAS No.4717-38-8
Molecular FormulaC20H24O2
Molecular Weight296.40 g/mol
CategoryPharmacopoeial Impurity Standards / EP Impurities
AvailabilityIn Stock

Chemical Structure

Ethinylestradiol EP Impurity A CAS 4717-38-8 chemical structure

Description

CATO manufactures Ethinylestradiol EP Impurity A 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.

Ethinylestradiol EP Impurity A (CAS 4717-38-8) is a certified pharmaceutical impurity reference standard with the molecular formula C20H24O2 and a molecular weight of 296.40 g/mol.

Owing to a steroid core, a hydroxyl group, an ether linkage, Ethinylestradiol EP Impurity A is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 296.40 g/mol — guide the selection of appropriate sample preparation and analytical techniques. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).

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 FormulaC20H24O2
Molecular Weight296.40 g/mol
AppearancePale yellow to yellow crystalline powder
Purity>95%
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)9.0
UV AbsorptionUV-absorbing
Structural FeaturesAromatic ring present
CAS Registry Year (est.)1958

Related Ethinylestradiol Standards

Recommended Standards

Why CATO?