Percentage of survival (A, B, C) and average body weight (D, E, F) of mice orally administered with test compounds at indicated concentrations twice per day and challenged with 10× LD50 of A/WSN/33 (H1N1) influenza virus. The number of mice and the average weight of the mice at day 0 (10 mice per group) were defined as 100%, respectively. ***: P < 0.0001. **: P < 0.001. *: P < 0.05.