This compound is primarily used in research and analytical applications, particularly in the field of metabolomics and biomarker studies. It serves as a stable isotope-labeled internal standard for the quantification of metabolites in biological samples, ensuring accurate and reliable measurements. Its deuterated structure allows for precise tracking and differentiation in mass spectrometry analyses, aiding in the study of metabolic pathways and the identification of disease biomarkers. Additionally, it is employed in the development and validation of analytical methods for detecting and measuring cysteine-related compounds in complex matrices.