Isolation and determination of biflavonoids in Ginkgo biloba leaves Study on biflavonoids from stem bark of Daphne giraldii A new biflavonoid from Selaginella uncinata Studies on phenolic compounds from Stellera chamaejasme Chemical constituents from roots of Stellera chamaejasme The Chemical Constituents from Podocarpus brevifolius Chemical constituents of Selaginella sinensis Advances in chemical and pharmacological studies on Stellera chamaejasme