Maribavir Impurity 10 (CAS 142356-40-9) is a synthesis-related contaminant monitored for its effect on drug substance quality and stability. This impurity exhibits distinctive chromatographic retention and mass spectral fragments that facilitate detection by HPLC-PDA and LC-MS/MS. Formation pathways indicate susceptibility to hydrolytic and oxidative conditions during intermediate processing, making process parameter control and in-process sampling critical. Robust analytical methods, validated limits and forced-degradation studies are recommended to define acceptable levels and support regulatory filings. Characterizing its physicochemical properties enables targeted mitigation strategies in route optimization and ensures consistent impurity profiling for quality assurance.
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