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从梧桐科植物山芝麻(Helicteres angustifolia L.)的根中分离出6种成分。其中3种为已知化合物β-谷甾醇(β-sitosterol),白桦脂酸(betulic acid)和齐墩果酸(oleanolic acid)。其余3种为新的三萜类化合物,命名为山芝麻酸甲酯(methyl helicterate),山芝麻宁酸甲酯(methyl helicterate)和山芝麻宁酸(helicterilic acid)。其化学结构经光谱分析和衍生物制备分别推定为Ⅰ,Ⅱ和Ⅳ。
From the roots of Helicteres angustifolia L., six components were isolated. Three of them are the known compounds β-sitosterol, betulic acid and oleanolic acid. The remaining three species are new triterpenoids named methyl helicterate, methyl helicterate and helicterilic acid. Its chemical structure was presumed to be I, II, and IV by spectral analysis and derivative preparation, respectively.