Four isoprenoid-substituted flavonoids from Glycyrrhiza aspera

Two new isoprenoid-substituted isoflavanones, glyasperins K and M, a 3-arylcoumarin, glyasperin L, and an isoflavone, glyasperin N, were isolated from the roots of Glycyrrhiza aspera. The structures of glyasperins K-N were elucidated by spectroscopic methods.