前文中作者已报道从我国特有植物银杏(Ginkgo biloba L.)的叶子中分到银杏内酯A及C(ginkgolide A，C)，本文报道从银杏叶中分到的另外二个结晶，经理化性质、薄层层析、红外光谱及质谱分析，鉴定结晶Ⅲ为银杏内酯B(ginkgolide B)，结晶Ⅳ为白果内酯(bilobalide)，后者为国内首次分离。

Beside the ginkgolide A and C were isolated from the leaf of Ginkgo biloba L reported in 1990, the authors have succeeded in isolating other two crystals from it. They were identified as ginkgolide B and bilobalide by TLC, 1R and MS, and the bilobalide is first isoiated from this plant at home.