Atovaquone Impurity 4 CAS 91161-85-2

Description

Under current pharmacopoeial and regulatory frameworks, quality-control requirements for this class of reference material explicitly involve the control of targets including Atovaquone Impurity 4.

Atovaquone Impurity 4 (CAS 91161-85-2) is a certified pharmaceutical impurity reference standard with the molecular formula C14H17ClO and a molecular weight of 236.74 g/mol.

Owing to a hydroxyl group, an ether linkage, chlorine substitution, an aromatic ring system, Atovaquone Impurity 4 is typically off-white to pale yellow low-melting solid. Its solid-state physicochemical attributes — including a molecular weight of 236.74 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).

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.

As a certified reference material (CRM), Atovaquone Impurity 4 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.

Physical & Chemical Properties

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