Benazeprilat-d5 is primarily used in analytical and research settings as an internal standard for the quantification of benazeprilat, the active metabolite of benazepril, in various biological samples. Its deuterated structure allows for precise and accurate measurement in mass spectrometry-based assays, minimizing interference and enhancing the reliability of pharmacokinetic and metabolic studies. This compound is particularly valuable in clinical research to assess drug metabolism, monitor therapeutic drug levels, and evaluate patient adherence to benazepril therapy. Additionally, it aids in the development of sensitive and specific analytical methods for detecting and quantifying benazeprilat in complex matrices such as plasma, urine, or tissues.