Relugolix Impurity 203 CAS CATO-C4X-2429203

Description

The occurrence of Relugolix Impurity 203 is closely related to deuterium isotope labeling, a steroid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage, fluorine substitution in its molecular formula, which determines its behaviour during synthesis, purification, or degradation.

Relugolix Impurity 203 (CAS CATO-C4X-2429203) is a certified pharmaceutical impurity reference standard with the molecular formula C28H21D3F2N8O6S and a molecular weight of 641.62 g/mol.

The molecular framework of Relugolix Impurity 203 (C28H21D3F2N8O6S) is characterized by deuterium isotope labeling, a steroid core, an amide group, a sulfone group, a hydroxyl group, an ether linkage, fluorine substitution. In reversed-phase chromatography, its retention is governed primarily by the protonation state of its nitrogen-containing groups, which provides a practical basis for HPLC-UV/DAD or LC-MS method development. 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).

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.

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

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