SEARCH Articles Figures Tables 12-Oxygenated withanolides Acnistus [Withanolides Acnistus arborescens [Withanolides Dunalia [Withanolides Nicandra [Withanolides Solanaceae, withanolides Spiranoid withanolides Withania [Withanolides Withania somnifera [Withanolides Withanolide Withanolide Withanolide antitumor activity Withanolide biological activities Withanolide insect antifeedant properties Withanolide novel structure Withanolide, glycoside Withanolides activity Withanolides biological activity Withanolides biosynthesis Withanolides chemistry Withanolides from South American solanacea Withanolides occurrence Withanolides structures