从草药羊红膻Pimpinella thellungiana根中分得2个化合物，经光谱分析（IR，MS，¹HNMR，¹³CNMR，DEPT，¹H-¹HCOSY，¹H-¹³CCOSY），鉴定为：erythreo-5-n-pentyl-4-hydroxytetrahydrofuran-2-one（Ⅰ）和threo-5-n-pentyl-4-hydroxytetrahydrofuran-2-one（Ⅱ），分别命名为羊红膻素C及羊红膻素D，为2个新的天然产物。

Two new compounds named thellungianin C and D were isolated from the root of Pimpinella thellungiana Wolff.On the basis of spectral analysis (UV,IR,MS,¹H NMR,¹H-¹H COSY, ¹³C NMR,¹H¹³C COSY, DEPT),they were identified as erythreo-5-n-pentyl-4-hydroxy tetrahydrofuran-2-one (Ⅰ) and threo-5-n-pentyl-4-hydroxy tetrahydrofuran-2-one (Ⅱ).