Hemislin B Glucoside, a New Lignan from Hemistepta lyrata

From the ethanolie Extract of the whole plant of Hemistepta lyrata Bunge.,a new lignan, named hemislin B Glucoside,has been isolated as α-(trans-3-methoxy-4-O-β-D-glucopyranosylbenzylidene)-β-(3,4-dimethoxybenzyl)-γ-butyrolactone. Its structure has been established on the basis of UV, IR, FABMS,¹H-NMR,¹³C-NMR, HMQC and HMBC speetral analysis.