2007,Vol.28,No.085545552007,Vol.28,No.08Fig.1Basicstructureofflavone2007,Vol.28,No.08556Fig.2Structureofqueretin-3-propylesterFig.3StructureofkaempferolFig.4StructureofnympholideAFig.5StructureofnympholideBFig.6Structureofmyricetin-3-O-(6-p-coumarlyl)glucosideFig.7StructureofhyperinFig.8Structureofisoquercetin5572007,Vol.28,No.08Fig.9StructureofastragalinFig.10Structureofquercetin2007,Vol.28,No.08558???????????????????