Used primarily as an intermediate in the synthesis of pharmaceuticals, particularly in the production of antihistamines and non-steroidal anti-inflammatory drugs (NSAIDs). Its structure allows for effective modification to create active drug compounds, especially those targeting allergic reactions and inflammation. The cyclopentyl group enhances lipophilicity, improving tissue penetration and bioavailability in final drug formulations. It is also employed in the development of chiral building blocks for asymmetric synthesis in medicinal chemistry.