Cyclosporin A-Derivative 1 is primarily utilized in the field of immunology and medicine due to its immunosuppressive properties. It is often employed in organ transplantation to prevent rejection by inhibiting the activity of T-cells, which play a critical role in the immune response. This derivative is also explored in the treatment of autoimmune diseases such as rheumatoid arthritis and psoriasis, where it helps to modulate the immune system and reduce inflammation. Additionally, it is being studied for its potential therapeutic effects in certain inflammatory and dermatological conditions, offering a targeted approach to managing these disorders. Its application extends to research settings, where it is used to understand immune system mechanisms and develop new treatments for immune-related diseases.