New Flavonolignan Glycosides from the Aerial Parts of Zizania latifolia

Abstract

Two new flavonolignan glycosides, tricin-4'-O-(threo--guaiacylglyceryl) ether 7''-O--d-glucopyranose (4) and tricin-4'-O-(erythro--guaiacylglyceryl) ether 7''-O--d-glucopyranose (5) were isolated from the roots of Zizania latifolia, together with tricin-7-O--d-glucopyranose (1), tricin-4'-O-(threo--guaiacylglyceryl) ether 7-O--d-glucopyranose (2), and tricin-4'-O-(erythro--guaiacylglyceryl) ether 7-O--d-glucopyranose (3). Their structures were identified on the basis of spectroscopic techniques, including HR-ESI/MS, 1D-NMR (H-1, C-13, DEPT), 2D-NMR (gCOSY, gHSQC, gHMBC), and IR spectroscopy.