Maribavir Impurity 3 (CAS 176299-71-1) is a process-related and/or degradation impurity observed during synthesis and stability of maribavir. It requires comprehensive identification and quantification to establish impurity profiles and control strategies. Analytical characterization typically employs HPLC, LC-MS and NMR to determine retention behavior, exact mass and structural elucidation. Understanding formation pathways helps optimize synthetic steps and formulation conditions to minimize levels. Specifications should be set in line with ICH Q3A and Q3B limits with validated methods for detection at trace levels. Batch release and stability testing include targeted monitoring to ensure safety and product quality.
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