从白花前胡(Peucedanum praeruptorum Dunn)根的醚提取物中除分得已知香豆素白花前胡丙素和另一种结晶外,还分得一种具有生理活性的香豆素单体,命名为(+)白花前胡素(E)[(+)praeruptorin E]。经元素分析、紫外、红外、质谱、核磁、气相及水解产物的鉴定,证明白花前胡素(E)为(+)3′-当归酰基-4′-异戊酰基-顺式-凯林酮(+)3′-angeloyl-4′-isovalerylcis-khellactone,此香豆素对小白鼠具有耐缺氧作用。关于其他成分,将另有报告。 From the ether extract of the root of Peucedanum praeruptorum Dunn, a coumarin monomer with a physiological activity was also assigned to the known coumarin broccoli and another crystal. +) Peucedanum (E) [(+) praeruptorin E]. The elemental analysis, UV, IR, MS, NMR, gas phase and the identification of the hydrolyzed product demonstrated that (B) is (+)3′-angelacyl-4′-isovaleryl-cis-kailinone (+) 3′-angeloyl-4′-isovalerylcis-khellactone. This coumarin is hypoxic to mice. With regard to other ingredients, it will be reported separately.