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-3beta,9alpha-diol-18-al-21(24)-olido-3beta-D-glucopyranoside 1,lanast-1,11,22-trien-3beta,9alpha-diol-18-al-21(24)-olido-3beta-D-glucopyranosyl-(l'-4')-beta-D-glucopyranoside 2,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:1H and 13C NMR,1H-1H COSY,1H-13C HETCOR and DEPT aided by EIMS,FABMS and IR spectroscopy.