... also spelled gingko, also known as the Maidenhair Tree, is a unique species of tree with no close living relatives. Ginkgo ... glycosides and Terpene lactones, and have been used pharmaceutically. The flavone glycosides, such as keampferol, quercetin, isorhamnetin, ... have anti-oxidant and free radical properties. The ginkgolides, which are trilactonic diterpenes, include ginkgolide A, ...