Des-difluoro Keto Ledipasvir can be obtained from (S)-5-(tert-Butoxycarbonyl)-5-azaspiro[2.4]heptane-6-carboxylic Acid (CAS 1129634-44-1) which can be used as reagent/reactant in preparation of fused bicyclic compds. end-capped with peptide derivatives as HCV inhibitors.
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