Used in antiviral medications, particularly in the treatment of hepatitis C. It acts as a nucleoside analog that inhibits viral RNA replication by targeting the RNA-dependent RNA polymerase enzyme. This compound serves as a key intermediate in synthesizing active pharmaceutical ingredients designed to combat RNA viruses. Its structure allows for efficient incorporation into viral RNA, leading to chain termination and suppression of viral replication. Widely utilized in the development of direct-acting antiviral drugs with high potency and improved resistance profiles.