银杏叶中一个新的萜内酯类成分（英文）

A new ginkgolide from Ginkgo biloba

摘要: 目的：研究银杏（Ginkgo biloba L.）叶中新的化学成分。方法：运用柱色谱方法分离纯化，利用UV、IR、MS、_{1H NMR、¹³}C NMR等色谱技术鉴定化合物结构。结果：从银杏叶中分离鉴定出1个新化合物：1，7，10-三羟基-3，14-去氢银杏内酯(Ⅱ)和1个已知化合物：银杏内酯L(ginkgolide L)(Ⅰ)。结论：化合物Ⅱ为新化合物，命名为银杏内酯N（ginkgolide N）；化合物Ⅰ的光谱数据为首次报道。

Abstract: Aim ：To study new chemical constituents of the leaves of Ginkgo biloba L. Methods ：Isolation and purification were carried out by several chromatographic methods.The structures of the compounds were elucidated by detailed analysis of their UV，IR，MS，¹H NMR and ^{13C NMR spectra. Results ：A new ginkgolide，ginkgolide N(1，7，10-trihydroxy-3，14- dehydroginkgolide，II)，along with a known compound，was isolated from the leaves of G.biloba.The structure of the known one was elucidated as ginkgolide L(I). Conclusion ：Compound II was a new compound.The complete spectroscopic data of compound I were reported for the first time.}