Maribavir Impurity 4 (CAS 176161-18-5) is a process-related and degradation impurity detected during maribavir synthesis and stability testing. Identified and quantified by HPLC, LC-MS and 1H/13C NMR, it shows a reproducible retention time and characteristic mass fragmentation useful for trace-level monitoring. Elucidation of its formation pathways, including incomplete reaction intermediates or oxidative degradation, supports targeted mitigation strategies. Available analytical data on solubility, thermal behavior, and detector response factors enable robust method validation, forced-degradation studies and specification setting to control impurity levels and ensure compliance with regulatory quality expectations.
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