Fig. 1From: Neuroprotective effects of Eucommia ulmoides Oliv. and its bioactive constituent work via ameliorating the ubiquitin-proteasome systemStructures of the seven compounds isolated from Eucommia ulmoides. Two terpenes (betulinic acid and betulin), two flavonoids (wogonin and oroxylin A), and three iridoids (genipin, geniposidic, and aucubin) were isolated from E. ulmoides and purities (98 %) were verified using HPLC-UV analysisBack to article page