This compound, (R)-BoroLeu-()-Pinanediol hydrochloride, is primarily used in chemical and pharmacological research to develop and test the efficacy of protease inhibitors. Proteases are enzymes involved in various biological processes, such as protein degradation and intracellular signaling. It is also studied for its potential to inhibit cancer cell growth and for applications in treating diseases related to abnormal protease function, including viral infections and neurological disorders. The use of this substance facilitates the development of new drugs with high efficacy and specificity toward biological targets. As a chiral boronic acid derivative, it serves as a key building block in the synthesis of peptide analogs and bioactive molecules targeting proteases.