中文摘要：

目的研究桦褐孔菌Inonotus obliquus子实体的化学成分。方法采用硅胶、MCI、Sephadex LH-20凝胶等柱色谱方法进行分离纯化,根据理化性质和波谱分析对化合物结构进行鉴定。结果从桦褐孔菌子实体95%乙醇提取物中分离得到13个三萜化合物和2个甾醇化合物,分别鉴定为3-羊毛甾-8,24-二烯-21-醛（1）、羊毛甾醇（2）、3β-羟基-羊毛甾-8,24-二烯-21-醛（3）、白桦脂醇（4）、桦褐孔菌醇（5）、栓菌酸（6）、3β,21-二羟基-羊毛甾-8,24-二烯（7）、齐墩果酸（8）、乌苏酸（9）、白桦脂酸（10）、桦褐孔菌素A（11）、桦褐孔菌萜D（12）、3β-乙酰氧基-11α,12α-环氧-齐墩果烷-28,13β-内酯（13）、麦角甾醇（14）、麦角甾烷-4,6,8,22-四烯-3-酮（15）。结论化合物1为1个新的三萜化合物,命名为桦褐孔菌素D;化合物9、13、15为首次从桦褐孔菌子实体中分离得到。

英文摘要：

Objective To study the triterpenoids from the fruiting body of Inonotus obliquus. Methods The compounds were isolated and purified by silica gel, MCI gel, Sephadex LH-20 column chromatographies, and their structures were mainly elucidated on the basis of physicochemical characteristics and spectral analysis. Results Fifteen compounds were isolated from 95% Et OH extract of I. obliquus, and were identified as 3-oxo-lanosta-8,24-diene-21-al（1）, lanosterol（2）, 3β-hydroxy-lanosta-8,24-diene- 21-al（3）, betulin（4）, inotodiol（5）, trametenolic acid（6）, 3β,21-dihydroxy-lanosta-8,24-diene（7）, oleanic acid（8）, ursolic acid（9）, betulinic acid（10）, inonotusane A（11）, inoterpene D（12）, 3-O-acetyl-11α,12α-epoxy-oleanan-28,13β-olide（13）, ergosterol（14）, and ergosta-4,6,8,22-tetraene-3-one（15）, respectively. Conclusion Compound 1 is a new triterpenoid named as inonotusane D, while compounds 9, 13, and 15 are isolated from I. obliquus for the first time.