中文摘要：

本文对大戟科巴豆属植物鸡骨香根部的化学成分进行研究。采用硅胶、葡聚糖凝胶以及制备型高效液相色谱技术从其乙醇提取物的乙酸乙酯萃取部位分离得到9个二萜类化合物,其中一个为新化合物。采用波谱等手段对其结构进行了鉴定,分别为Crassifolin P（1）,Crassifolin J（2）,9-[2-（2（5H）-呋喃酮-4-）乙基]-4,8,9-三甲基-1,2,3,4,5,6,7,8-八氢奈环-1-甲酯（3）,Penduliflaworosin（4）,异山藿香定（5）,Crassifolin G（6）,山藿香定（7）,Chettaphanin I（8）,石岩枫二萜内酯（9）。其中,化合物1是一个新化合物。

英文摘要：

Croton crassifolius Geisel belongs to the genus croton of the family euphorbiaceae. By means of solvent extraction and repeated chromatorgraphy on silica gel, Sephadex LH-20 and HPLC, the ethanol extract of the roots of Croton crassifolius Geisel was chemically investigated, which led to the isolation of nine diterpenoids. By using spectroscopic analysis, their structures were identified as follows： Crassifolin P（1）, Crassifolin J（2）, 1,5,6-trimethyl-5-（2-（5-oxo-2,5-dihydrofuran-3-yl）ethyl）-1,2,3,4,5,6,7,8-octahydronaphthalene-1-carboxylate（3）, Penduliflaworosin（4）, isoteucvin（5）, Crassifolin G（6）, teucvin（7）, Chettaphanin I（8）, mallotucin D（9）. Among of them compound 1 was a new compound.