中文摘要：

从炭角菌属真菌290中分离得到两个新的海松烷犁二萜xylarianesA（1）和B（2），以及一个已知的该类二萜16-hydroxy isopimar-7-en-19-oic acid（3）．通过一维和二维NMR数据解析及高分辨率质谱分析确定了化合物143的化学结构．化合物1～3在抗肿瘤活性测定中均未显示出活性．

英文摘要：

Two new pimarane-type diterpenes, xylarianes A （1） and B （2）, were isolated from the crude extract of the fungus Xylaria sp. 290 along with one known compound of 16-hydroxy-isopimar-7-en-19-oic acid （3）. The chemical structures of 1- 3 were elucidated by spectroscopic methods including 1D-NMR and 2D-NMR experiments and HR-ESIMS. The antitumor assay of compounds 1 -3 showed that they have no activities.