Chemical constituents from the leaves of Rhododendron dauricum L.

The chemical constituents of the leaves of Rhododendron dauricum L.were studied by the methods of column chromatography and HPLC.As the results,six compounds were isolated and their structures were elucidated as germacrone(1),grifolic acid(2),β-sitosterol(3),octacosand(4),daucosterol(5),and oleanolic acid(6) by means of spectroscopic analysis.Compounds 4 and 5 were isolated from this plant for the first time.