Benzoyl-DL-leucine is primarily used in biochemical research and pharmaceutical development. It serves as a key intermediate in the synthesis of peptides and other complex organic compounds. Its application extends to studies involving enzyme kinetics and protein interactions, where it helps in understanding metabolic pathways and biochemical processes. Additionally, it is utilized in the development of therapeutic agents, particularly in the design of drugs targeting specific enzymes or proteins. Its role in modulating biological activity makes it valuable in both academic and industrial research settings.