FKK is primarily utilized in the pharmaceutical industry as a key intermediate in the synthesis of various active pharmaceutical ingredients (APIs). It plays a crucial role in the development of drugs targeting specific diseases, particularly in the area of oncology and autoimmune disorders. Its chemical structure allows for efficient modification, enabling the creation of compounds with enhanced therapeutic efficacy and reduced side effects. Additionally, FKK is employed in research laboratories for studying biochemical pathways and developing novel therapeutic agents. Its versatility and reactivity make it a valuable component in medicinal chemistry and drug discovery processes.