Used as a key intermediate in the synthesis of antifolate drugs, particularly in the production of methotrexate, a chemotherapy agent and immunosuppressant. It plays a critical role in targeting rapidly dividing cells by inhibiting dihydrofolate reductase, an enzyme involved in DNA synthesis. Due to its structural specificity, it is valuable in pharmaceutical research for developing treatments for cancer, autoimmune diseases like rheumatoid arthritis, and psoriasis. Its application extends to laboratory settings for studying folate metabolism and designing new therapeutic agents with improved selectivity and reduced side effects.