Grazoprevir is a drug approved for the treatment of hepatitis C. Grazoprevir is a second-generation hepatitis C virus protease inhibitor acting at the NS3 4a protease targets.
7-hydroxy Coumarin sulfate is a phase II metabolite of coumarin that can be used as an internal standard for the analysis of 7-hydroxy coumarin metabolism using GC- or LC-MS.