Three new iridoid glucosides, 8-O-(p-coumaroyl)-harpagide, 6'-O-(p-coumaroyl)-procumbide and procumboside, have been isolated from the roots of Harpagophytum procumbens DC., together with three known iridoid glucosides, harpagide, harpagoside, and procumbide. Procumboside is a novel iridoid glucoside having an ether linkage between C-3 and C-6.
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Kikuchi et al. (1983) studied this question.