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We screened a chemical library of 2000 compounds for inhibitors of hepatitis C virus (HCV) serine proteinase using an in vitro screening method measuring the hydrolysis of the peptide substrate. Three compounds were found to be the most potent inhibitors (IC SH 6 10 3S M). Two of them had a similar structure, that of halogenated benzanilide, and were not inhibitory for common serine proteinases. They inhibited the enzyme non-competitively with the substrate. Together with the result of the analogous compounds in the chemical library, the presumed structural requirements of the inhibition are pointed out.z 1998 Federation of European Biochemical Societies.

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