Cyclized Geranyl Stilbenes from the Rhizomes of Helminthostachys zeylanica

Abstract

Three new cyclized geranyl stilbenes, ugonstilbene A (1), ugonstilbene B (2), and ugonstilbene C (3), and one known compound 3-hydroxyacetophenone, were isolated from the dried rhizomes of H. zeylanica. The structures of these three new compounds were elucidated on the basis of spectral analysis. Compounds 1 - 3 exhibited moderate antioxidant activity by the DPPH assay with IC₂₀ of 11.31 ± 1.11, 38.72 ± 0.47, and 30.80 ± 1.19 μM, respectively, while the IC₂₀ of Trolox was 8.70 ± 0.95 μM.

References

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