New phenolic glycosides from Curculigo orchioides and their xanthine oxidase inhibitory activities.

Seven new phenolic glycosides including two heterocyclic phenolic derivatives orcinosides I-J (1-2) and five chlorophenolic glycosides curculigines J-N (3-7), together with nineteen known compounds were isolated from the rhizome of Curculigo orchioides. Based on extensive spectroscopic analyses (UV, IR, HRESIMS, 1D and 2D NMR), the structures of the new compounds were identified. Orcinoside I (1) and J (2) displayed xanthine oxidase inhibitory activities with IC50 values 0.25 and 0.62mM respectively.