FNC-TP trisodium is the intracellular active form of FNC. FNC is a potent nucleoside reverse transcriptase inhibitor (NRTI) , with antiviral activity on HIV , HBV and HCV. FNC-TP (trisodium) 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.