![]() ![]() Most glycosides share similar properties such as strong modifiability and rapid absorption hence, they are popular sources of lead compounds. ![]() ![]() Besides, they are mostly in the form of glycosides and are combined with glucose at the C-1 hydroxyl group. Iridoids have hemiacetal hydroxyl groups and are active in nature. Based on the structure, these compounds can be divided into four groups: iridoid glycosides, secoiridoid glycosides, non-glycosidic iridoids, and bis-iridoids. They are more prevalent in the kingdom Plantae, especially in the dicotyledonous plants from Scrophulariaceae, Pyrolaceae, Oleaceae, Labiatae, Rubiaceae, and Gentianaceae. Iridoids, a large and still expanding class of cyclopentane pyran monoterpenes, are composed of two basic carbon frameworks, substituted iridoids, and secoiridoids. ![]()
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