Faculty of Pharmacy, Isfahan University of Medical Sciences, Isfahan, I.R. Iran
The iridoids are a group of bitter tasting monoterpenoid lactones having a cyclopentano dihydropyran ring system often with glucose attachment to the hydroxyl group of the lactone ring.
Their main purpose seems to be one of the providing feeding deterrence and some are also antimicrobials , Some of these plants are used as bitter tonics e.g. Menyanthes ,Others against inflammations e.g. Euphrasia , Some have antimicrobial with a little antileukemic activity such as fulvoplumerin and allamandin and Some such as aucubin are laxative and diuretic and nonglucosid iridiods of valerianaceae are sedative.