Fig. 1From: The nucleoside antiviral prodrug remdesivir in treating COVID-19 and beyond with interspecies significanceChemical structure of remdesivir, sofosbuvir, tenofovir disoproxil and tenofovir alafenamide Those are nucleoside/nucleotide drugs featured by the heterocyclic ring linked to the phosphorus atom at the center. The connecting atoms are pointed by a red arrowBack to article page