Used primarily in the treatment of skin conditions such as psoriasis and vitiligo, this compound is a key component in PUVA therapy. It works by sensitizing the skin to ultraviolet light, enhancing the effectiveness of UV treatment. Additionally, it has applications in photopheresis, a process used to treat certain types of lymphoma and autoimmune diseases. Its ability to bind to DNA and inhibit cell proliferation makes it valuable in dermatological and oncological therapies.