Flupentixol EP Impurity D (Free Base), CAS: 791521-96-5, is a process-related impurity encountered during flupentixol API manufacture that demands precise control to safeguard product quality and regulatory compliance. Characterization relies on validated HPLC-UV methods with orthogonal confirmation by LC-MS and NMR to define structure and chromatographic behavior. Routine monitoring employs stability-indicating assays and validated quantification to establish specification limits in line with ICH guidance. Understanding its synthetic origin and documenting retention time, mass spectral profile and proposed formation pathway enables targeted purification strategies, risk assessment and robust batch release criteria for the API.
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