Forsythia suspensa (Thunb) Vahl. (Oleaceae) is an important original plant of the Chinese traditional drug lianqiao which had been used for antiinflammatory, antibacterial, diuretic, drainage and antidotal purposes in traditional Chinese medicine. In order to search for the biologically active substances, we have reinvestigated the chemical constituents of F. suspensa. 36 compounds, including caffeoyl glycosides, cyclohexylethane derivatives, flavonoides, iridoid glycoside, lignans, and triterpenes etc., ha...