Brexpiprazole Impurity 131 is a process and degradation related variant observed during manufacture and stability studies of brexpiprazole. This impurity exhibits distinct chromatographic and mass spectral behavior enabling identification by HPLC with UV detection and LC-MS confirmation | while structural elucidation is supported by 1H NMR and 13C NMR. Physicochemical profiling indicates lower polarity relative to the parent API and a propensity to form under oxidative or basic stress. Quantitative monitoring and specification setting in line with ICH Q3A and Q3B are recommended to ensure product safety and efficacy | with control strategies including optimized purification | in process monitoring and validated analytical methods.
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