Azvudine (RO-0622) is a potent nucleoside reverse transcriptase inhibitor (NRTI), with antiviral activity on HIV , HBV and HCV . Azvudine exerts highly potent inhibition on HIV-1 (EC 50 s ranging from 0.03 to 6.92 nM) and HIV-2 (EC 50 s ranging from 0.018 to 0.025 nM). Azvudine inhibits NRTI-resistant viral strains. Azvudine is a click chemistry reagent, it contains an Azide group and can undergo copper-catalyzed azide-alkyne cycloaddition reaction (CuAAc) with molecules containing Alkyne groups. It can also undergo strain-promoted alkyne-azide cycloaddition (SPAAC) reactions with molecules containing DBCO or BCN groups.