Isolation and structure elucidation of a new flavonol glycoside from .

A new flavonol glycoside named Sabiapside A (), along with four known compounds, quercetingentiobioside (), camellianoside (), isobariclisin rutinoside (), tsubakioside A (), was isolated from . Their structures were elucidated by extensive spectroscopic analysis including MS, UV, IR and NMR data. The antioxidant activities of these glycosides evaluated by ABTS and DPPH radical scavenging reaction was higher than that of vitamin C used as the reference antioxidant.