“…Pradefovir (44), invented by Metabasis Therapeutics, is a prodrug that targets adefovir to the liver for the treatment of hepatitis B and is in Phase II clinical trials [114,[120][121]. Besifovir (45, LB80380), invented by LG Chem Ltd, is an acyclic nucleotide phosphonate with chemical similarity to adefovir and tenofovir, which has completed the clinic safety and efficacy study in the patients with lamivudine-refractory chronic hepatitis B, bioequivalence of LB80380 free base and maleate salt tablets and safety and efficacy study of LB80380 in the treatment-naive patients of chronic hepatitis B [122][123][124][125][126][127]. Tenofovir alafenamide (46, TAF; GS-7340), invented by Gilead Sciences, is a prodrug of TDF and achieves higher active metabolite concentrations in peripheral blood mononuclear lymphocytes and lymphatic tissues [128][129][130][131].…”