The flavonol glycosides, such as flavonol 3-O-rutinosides, 3-O-glucosides and 3-O-sophoroside-7-rhamnosides were determined to distinguish between the three subspecies.
In this paper, EI and FAB-MS of tri and tetra-O-acetyl C-glucosides and C-galactosides were reported. Some characteristic fragmentation patterns of O-acetyl C-glycosides were discussed.