A NOVEL KAEMPFEROL TRIGLYCOSIDE FROM FLOWER BUDS OF Panax quinquefolium

Three kaempferol glycosides were isolated from the flower buds of Panax quinquefolium L. together with kaempferol (1). By means of chemical and spectroscopic methods (NMR, ESI-MS, 2D NMR), their structures were established as trifolin (2), panasenoside (3), and kaempferol-3-O-beta-D-glucosyl(1 -> 2)-beta-D-galactoside-7-O-alpha-L-rhamnoside (4). Compound 4 is a new compound.