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The structure of glycosides of oleanolic acid isolated from the roots of Calendula officinalis



The structure of glycosides of oleanolic acid isolated from the roots of Calendula officinalis



Phytochemistry 10(5) 1121-1124



A new series of glycosides of oleanolic acid was discovered in the roots of old Calendula officinalis plants. These compounds derivatives of 3-glucoside of oleanolic acid are different, from those previously isolated from the flowers of this plant, derivatives of 3-glucuronoside of oleanolic acid. The sugar components of 8 representatives of the new series are glucose and galactose in following ratios: in glucoside I, 1:0; in II, 1:1; in III, 1:2; in IV, 2:1; in V, 3:1; in VI, 3:2; in VII, 4:1; in VIII, 4:1. The sugars in I–VII were attached only in position 3 of oleanolic acid, but in VIII one glucose molecule was joined to 28-carboxyl of oleanolic acid. I was identified as 3-monoglucoside and II as 3-(4-galactosyl)-glucoside of oleanolic acid. Besides these compounds, 6-methyl ester of 3-glucuronoside of oleanolic acid was found in Calendula roots.

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Accession: 017485078

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DOI: 10.1016/s0031-9422(00)89949-5


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