This chemical is primarily used in peptide synthesis as a protected form of leucine. The BOC (tert-butyloxycarbonyl) group acts as a protective group for the amino group, ensuring selective reactions during peptide chain assembly. The deuterium-labeled version (5,5,5-D3) is particularly valuable in research applications, such as mass spectrometry and NMR studies, where it serves as a stable isotope tracer to track metabolic pathways or study protein dynamics. Its monohydrate form ensures stability and ease of handling in laboratory settings. This compound is essential in the development of pharmaceuticals and biochemical research, enabling precise and controlled synthesis of peptides.