Used as a potent antiviral agent, particularly in the treatment of hepatitis C. It functions as an NS5A inhibitor, disrupting viral replication by targeting the hepatitis C virus non-structural 5A protein. This compound is effective against multiple genotypes of HCV and is often part of combination therapies to increase cure rates and reduce the likelihood of drug resistance. Its high potency allows for lower dosing, minimizing side effects while maintaining strong virologic response.