Diastereomeric stilbene glucoside dimers from the bark of Norway spruce (Picea abies)

Eight stilbene glucoside dimers containing either a dihydrofuran ring or a dihydro-1,4-dioxin moiety, designated as piceasides A-H, were isolated as four 1:1 mixtures of inseparable diastereomers. Their structures were determined by extensive spectroscopic means including 1D and 2D NMR spectra, and were supported by enzymatic hydrolysis and computational analysis.