Eight new phenylethanoid glycoside derivatives possessing potential hepatoprotective activities from the fruits of Forsythia suspensa

In our study to investigate components with hepatoprotective activities, eight new phenylethanoid glycoside derivatives (1-8) were isolated from the 75% EtOH-H2O extract of the fruits of Forsythia suspensa along with six known compounds (9-14). These new structures were elucidated through HRESIMS and extensive NMR spectroscopic techniques. The absolute configurations of their sugars were determined by GC analysis. The pharmacological assay showed that compounds 2, 3, and 9-11 displayed remarkable hepatoprotective activities against N-acetyl-p-aminophenol (APAP)-induced HepG2 cell damage at the concentration of 10 mu M (Bicyclol as positive contrast).