A and B from rice hulls of Oryza sativa

摘要

Two new compounds orizalanasterolide A and B identified as lanast-1, 11, 22-trien-3 beta, 9 alpha-diol-18-al-21(24)-olido-3 beta-D-glucopyranoside 1, lanast-1, 11, 22-trien-3 beta, 9 alpha-diol-18-al-21(24)-olido-3 beta-D-glucopyranosyl-(1'-4')-beta-D-glucopyranoside have been isolated from the rice hulls of Oryza sativa. Their structures have been elucidated with the help of 500/125 MHz NMR using 1D and 2D spectral methods viz: H-1 and C-13 NMR, H-1-H-1 COSY HETCOR and DEPT aided by EIMS, FABMS and IR spectroscopy.