Letrozole Impurity 11 CAS CATO-C4X-182911

Description

Compared with other compounds in its class, the molecular weight of 301.30 g/mol gives Letrozole Impurity 11 distinctive chromatographic separation conditions and mass-spectrometry parameter settings.

Letrozole Impurity 11 (CAS CATO-C4X-182911) is a certified pharmaceutical impurity reference standard with the molecular formula C17H11N5O and a molecular weight of 301.30 g/mol.

Owing to a steroid core, an amide group, a hydroxyl group, an ether linkage, Letrozole Impurity 11 is typically pale yellow to yellow crystalline powder. Its solid-state physicochemical attributes — including a molecular weight of 301.30 g/mol — guide the selection of appropriate sample preparation and analytical techniques. 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).

Recommended for quantitative analysis by HPLC, GC, LC-MS/MS, or GC-MS as an external calibration standard; it can also be used for spiked-recovery experiments, LOD/LOQ determination, and LC-MS/MS multiple-reaction-monitoring (MRM) calibration.

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

Why CATO?

• ISO 17034 accredited reference material producer (CNAS + ANAB dual accreditation)
• 130,000+ catalog items in stock, COA supplied with every batch
• Worldwide shipping with full export documentation (HS code guidance available)
• Technical support: +86 18665070610 / Nicole.chen@cato-chem.com