Except for these four flavonoids tested in this study, 5,7,4′-trihydroxy-8-methoxyflavone and 5,7,8,4′-tetrahydroxyflavone have been identified as S. baicalensis-associated flavonoids, exhibiting potent anti-influenza efficacy via inhibiting NA enzymatic activity [41–43]. The gene discussed is XK; the disease is influenza.