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 due to its ability to mimic natural nucleosides, leading to chain termination during viral genome replication. Its stereochemistry enhances selectivity and reduces off-target effects in host cells. Widely utilized in the development of direct-acting antiviral drugs with high potency and improved resistance profiles.