It contains flavonoids, saponins and other compounds. Chemical composition The whole herb contains phenolic components, tannin, volatile oil, saponins, flavonoids, etc. There are alkaloid reaction components, but no alkaloid crystals have been isolated. The phenolic components are chlorogenic acid and caffeic acid. Among the flavonoids, there are quercetin, quercetin, rutinoside, kaempferol glucoside, Cyanidin3-gentiobioside, etc.