[Chemical constituents from leaf of Rhododendron przewalskii]

To study the chemical constituents from the leaf of Rhododendron przewalskii.Isolate and purify compounds by chromatographic methods, and identify structures by spectroscopic methods.Six compounds were isolated and identified as hyperin (1), avicularin (2), gossypetin-3-O-β-D-galactoside (3), quercetin (4), betuloside (5) and β-sitosterol (6).Compounds 1-4 and 6 are isolated from Rhododendron przewalskii for the frist time.