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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.“,”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 ~(13)C 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.