... contains flavonoids, the main ingredients of kaempferol, quercetin, rutin, ginkgo Su, ginkgo Su, Amentotaxus pairs of flavonoids and other. Quinine is ... anti-allergic effects.Identification 1, character identification: the dry seed showed obovate or oval-shaped, slightly flat, long diameter ... 5 cm, diameter 1 to 1.8 centimeters shorter. Shell (seed coat) white, off-white to pale brown, smooth, hard ...