Used as a key chiral intermediate in the synthesis of statin-class cholesterol-lowering drugs, particularly atorvastatin and rosuvastatin. Its enantiomerically pure structure enables efficient construction of the pharmacologically active side chain in these medications. The hydroxyl and cyano functional groups allow for selective chemical transformations, making it valuable in multi-step pharmaceutical manufacturing. Its ester group aids in solubility and reactivity during coupling reactions. Widely utilized in asymmetric synthesis due to high stereochemical purity, ensuring the final drug product has the desired biological activity and safety profile.