4-Thio substituted coumarin derivatives, 4,5-dithio substituted coumarin derivatives, and coumarin dimers are provided, as well as processes for their preparation. The invention also provides a method and composition for the treatment of hepatitis C virus (HCV) by adiministering 4-thio substituted coumarin derivatives, 4,5-dithio substituted coumarin derivatives, and coumarin dimers.

 
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> Dimer poly-quaternary ester compounds

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