STRUCTURE DETERMINATION OF THREE NEW TRIERP HELICTERES ANGUSTIFOLIA LINN ENOIDS

Six chemical constituents (Ⅰ-Ⅵ) were isolated from the roots of Helieteres angustifolia L.. Three of them were shown to be identical with β-sitosterol, betulic acid and oleanolic acid. The other three were found to be new triterpenoids, named methyl helicterate, methyl helicterilate and helicterilic acid with structures elucidated as Ⅰ, Ⅱ and Ⅳ respectively, on the basis of spectroscopic analysis and preparation of derivatives.