飞龙掌血内酯,又叫毛两面针素,为香豆素类化合物,分子式C16H20O6,分子量308.33。毛两面针素存在于芸香科(Rutaceae)花椒属(ZanthoxylumL.)植物两面针(Zanthoxylumnitidum(Roxb.)DC.)、毛两面针(Zanthoxylumnitidumvar.fastuosum)、飞龙掌血(Toddaliaasiatica(L.)Lam.[PaulliniaasiaticaL.])中。
Toddalolactone, a natural coumarin, inhibits PAI-1 activity by preventing the formation of a stable PAI-1/uPA covalent complex, suggesting that the inhibitory effect of Toddalolactone may be due to the interference of close contact between plasminogen activator and the active center of PAI-1.