Thalidomide-O-C3-acid is primarily utilized in the field of medicinal chemistry and drug development. It serves as a key intermediate in the synthesis of more complex pharmaceutical compounds, particularly those targeting cancer and inflammatory diseases. Its structure allows for modifications that enhance the therapeutic properties of thalidomide derivatives, improving their efficacy and reducing side effects. Researchers leverage this compound to develop novel immunomodulatory drugs that can regulate the immune system, making it valuable in treatments for conditions like multiple myeloma and leprosy. Additionally, it is studied for its potential anti-angiogenic properties, which inhibit the formation of new blood vessels in tumors, thereby limiting their growth. Its applications extend to experimental therapies for autoimmune disorders, where it helps modulate immune responses.