Three new phenolic glycosides and a new lignan glycoside from Gaultheria leucocarpa var. yunnanensis

Three new phenolic glycosides (1–3) and a new lignan glycoside (4), together with five known compounds (5–9) were isolated from the ethanol extract of the aerial part of Gaultheria leucocarpa var. yunnanensis (Franch.) T.Z.Hsu & R.C.Fang. Their structures were determined on the basis of spectroscopic techniques, experimental and calculated ECD spectra, acid hydrolysis, and enzymatic hydrolysis experiments. All the isolates were evaluated for their anti-inflammatory and antioxidant activities. Compounds 7 and 8 exhibited inhibitory effects against the LPS-induced production of NO with IC50 of 63.71 and 10.66 μM, respectively, compared to L-NMMA having an IC50 of 6.95 μM. Besides, compound 7 also represented significant DPPH radical scavenging activity with EC50 of 18.75 μM, comparable with vitamin C (EC50 = 15.77 μM).