Biflavanones, Flavonoids, and Coumarins from the Roots ofStellera chamaejasmeand Their Antiviral Effect on Hepatitis B Virus

A new 3,3″‐biflavanone, isosikokianin A ( 1 ), was isolated from the roots of Stellera chamaejasme , together with eleven known compounds. Their structures and configurations were elucidated by spectroscopic methods including 2D‐NMR techniques. Sikokianin A, chamaechromone, and quercetin showed in vitro antiviral activity against HBsAg...