Objective: To study the chemical constituents with antiviral action from Yinqiaosan on influenza virus.
Method: Constituents were isolated by different kinds of column chromatography and their structures were elucidated with chemical and spectral methods.
Result: Eleven chemical constituents were isolated and elucidated as arctiin, phillyrin, forsythiaside, liquiritigenin, liquiritin, genistein, formononetin, daidzein, glycitrin, 3,3',4-tri-omethlellagic acid and chlorogenic acid.
Conclusion: Genistein, daidzein, glycitrin and 3,3',4-tri-omethlellagic acid were isolated from Yinqiaosan for the first time.