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[Chemical constituents of flavonoids from Apocynum venetum].

OBJECTIVE
To study the chemical constituents of flavonoids from Apocynum venetum L.


METHODS
The compounds from water extracts were isolated by HPD-100 MCI-gel, polyamide, silica and Sephadex LH-20. Their structrues were characterized by chemical methods and spectroscopic methods.


RESULTS
The five compounds were identified to be trifolin (I), hyperroside (III), hyperin (V), isoquercetin-6'-o-acetate (VII) and isoquercetin (VIII).


CONCLUSION
Compound I and compound VII are isolated from Apocynum venetum L. for the first time.