Die Struktur des Harpagosids. 2. Mitteilung über Iridoide

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Abstract
The structure and configuration of harpagoside, a bitter principle from the roots of Harpagophytum procumbens DC, have been elucidated by degradation reactions and NMR. spectra. The hitherto uncertain position of a secondary hydroxyl group could be assigned to C‐6 of the aglycone moiety. As earlier postulated, harpagoside (1) as well as its saponification product, harpagide (12), belong to a series of natural enol ethers known as iridoids.