4-Cyanophenylacetic acid is widely used in organic synthesis as a key intermediate for the production of pharmaceuticals and fine chemicals. It serves as a building block in the synthesis of various active pharmaceutical ingredients (APIs), particularly in the development of anti-inflammatory and analgesic drugs. Additionally, it is employed in the preparation of dyes and pigments due to its ability to form stable and vibrant color compounds. In research, it is utilized for studying enzyme inhibition and as a precursor in the development of novel compounds with potential therapeutic applications. Its versatility in chemical reactions makes it valuable in both industrial and academic settings.