Brexpiprazole Impurity 74 is a defined related substance observed during synthesis and stability studies of brexpiprazole. Robust analytical characterization using HPLC with UV detection, LC-MS and NMR is recommended to establish retention time, molecular weight and structural assignment. The impurity may arise from incomplete reactions or oxidative degradation and should be included in the impurity profile and control strategy according to ICH Q3A and Q3B guidelines. Establish qualification thresholds, validated quantification methods and appropriate purification steps to minimize levels. Stability-indicating methods, forced degradation studies and routine batch release testing ensure regulatory compliance and product quality.
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