前已报道从长叶竹柏(Podocarpus fleuryi Hickle)枝叶中分得十一种成分,并确定了它们的化学结构.今从中又分得一微量成分,经波谱测定及X射线衍射分析,确证为一种新型的失碳二萜双内酯,命名为长叶竹柏内酯(fleuryilectone,1). 长叶竹柏枝叶的醋酸乙酯提取部分经反复硅胶柱层析,得到10mg l的无色针晶,m.p.221℃.λ_(max)(OH_3OH):220nm(a,β-不饱和-γ-内酯)、ν_(max)(KBr):3350(羟基),1768(γ-内酯),1715(a,β-不饱和-γ-内酯).上述数据提示为二萜双内酯类化合物.它的 ~1H NMR(400 It has been reported previously that eleven components were separated from the branches and leaves of Podocarpus fleuryi Hickle and their chemical structures were determined. A trace component was also obtained from this and was identified by spectroscopy and X-ray diffraction A new type of decarboxylated diterpene bislactone was named fleuryilectone (1). The ethyl acetate fraction from the leaves and leaves of C. elongata was subjected to repeated silica gel column chromatography to obtain 10 mg l of colorless needle crystal. mp 221 ° C. λ max (OH 3 OH): 220 nm (a, β-unsaturated-γ-lactone), ν max (KBr): 3350 (hydroxyl group), 1768 (γ-lactone), 1715 a, β-unsaturated-γ-lactone). The above data suggest that it is a diterpene bislactone. Its 1H NMR (400