To investigate the chemical components from the stems of Casearia velutina Bl.,the constituents were isolated by repeated chromatography with silica gel,Sephadex LH-20,and ODS columns.The structures were elucidated by spectroscopic analysis.Eleven triterpenoids and its glycosides were isolated from the crude extract of C.velutina,and their structures were identified as friedelin-2,3-lactone（1）,friedelane（2）,epifriedelanol（3）,friedelin（4）,2α,3α,19α-trihydroxy-urs-12-en-28-oic acid（5）,2α,3β,19α-trihydroxy-urs-12-en-28-oic acid（6）,2α,3α,23-trihydroxy-urs-12-en-28-oic acid（7）,2α,3α,23-trihydroxy-olean-12-en-28-oic acid（8）,2α,3α,19α,23-tetrahydroxy-urs-12-en-28-oic acid（9）,2α,3α,19α,23-tetrahydroxy-urs-12-en-28-oic acid-28-O-β-D-glucopyranosyl ester（10）,and 3β,19α-dihydroxy-urs-12-en-28-oic acid 3-O-α-L-arabinopyranoside（11）.All the compounds described above were isolated from this species for the first time.Compound 1 is a rarely occurred seco-friedelolactone in Flacourtiaceae.
目的研究滇白珠(Gaultheria leucocarpa var.yunnanensis or var.crenulta)地上部分的化学成分。方法应用各种色谱技术进行分离纯化,用MS和NMR分析鉴定化合物结构。结果分离得到7个化合物,分别鉴定为①槲皮素-3-O-β-D葡萄糖醛酸苷、②山萘酚-3-O-β-D-葡萄糖醛酸苷、③龙胆酸甲酯、④水杨酸甲酯、⑤白珠树苷、⑥滇白珠素A、⑦滇白珠素B。结论化合物1～3是首次从该植物中分离得到。
To investigate the chemical constituents of a South China Sea gorgonian Menella sp., the isolation of ingredients was performed by solvent extraction and repeated chromatography on silica gel, Sephadex LH-20 and preparative TLC. The structures of isolated compounds were determined by spectroscopic analysis and comparison of 1H and 13C NMR data with those reported inliteratures. Three subergorane sesquiterpenoids and one suberosane sesquiterpenoid were isolated. Their structures were identified as subergorgic acid （1）, subergorgic acid methyl ester （2）, 2β-hydroxyl subergorgic acid methyl ester （3）, and suberosenol A （4）. All compounds were isolated from the genus Menella for the first time.
