Olaparib Impurity 42 (CAS 763114-25-6) is a process-related and potential degradation impurity observed in olaparib manufacturing. Characterized by LC-MS and confirmed by NMR and HRMS, this polar impurity shows a distinct HPLC retention time and UV absorbance pattern complicating chromatographic resolution. Formation pathways include incomplete reaction, over-reduction or hydrolytic cleavage during workup or storage. Regulatory control is guided by ICH Q3A thresholds with identification and quantification by validated HPLC-UV and LC-MS/MS methods. Purification, tightening of reaction parameters, and stability stress testing are effective risk mitigation measures to limit levels and ensure drug substance quality and safety.
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