Used in the synthesis of ledipasvir, an antiviral medication for the treatment of hepatitis C virus (HCV) infection. This intermediate plays a critical role in constructing the core structure of ledipasvir, enabling efficient and scalable production of the active pharmaceutical ingredient. It is utilized in multi-step organic synthesis under controlled conditions to ensure high purity and yield, meeting strict regulatory standards for drug manufacturing. Its application is primarily in pharmaceutical research and development, as well as in commercial production of HCV therapies.