Lanatoside C is a cardiac glycoside, can be used in the treatment of congestive heart failure and cardiac arrhythmia.Lanatoside C has an IC50 of 0.19 μM for dengue virus infection in HuH-7 cells. Target: in vitro: Dose-dependent reduction in dengue viral RNA and viral proteins synthesis were also observed upon treatment with increasing concentrations of Lanatoside C. Time of addition study indicated that Lanatoside C inhibits the early processes of the dengue virus replication cycle. Furthermore, Lanatoside C can effectively inhibit all four serotypes of dengue virus, flavivirus Kunjin, alphavirus Chikungunya and Sindbis virus as well as the human enterovirus 71. Lanatoside C possesses broad spectrum antiviral activity against several groups of positive-sense RNA viruses. [2]