Abstract
Four phenolic compounds and adenosine were isolated from the roots of Coix lachryma-jobi var. ma-yuen. On the basis of spectral evidence and the results of chemical synthesis, the structures of three were determined to be 4-ketopinoresinol, and threo- and erythro-1- C-syringylglycerol. The aglycone moiety of a new glucoside, 2,6-dimethoxy- p-hydroquinone 1- O-β- d-glucopyranoside, was determined from 13C and 1H NMR spectra and the position of the O-glucosyl moiety was confirmed by single-crystal X-ray analysis.
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