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. Lanatoside C can effectively inhibit all four serotypes of dengue virus, flavivirus Kunjin, alphavirus Chikungunya, Sindbis virus and the human enterovirus 71[1][2].