Quadranosides VI-XI, six new triterpene glucosides from the seeds of Combretum quadrangulare |
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Authors: | Adnyana I K Tezuka Y Awale S Banskota A H Tran K Q Kadota S |
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Institution: | Institute of Natural Medicine, Toyama Medical and Pharmaceutical University, Sugitani, Japan. |
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Abstract: | Six new triterpene glucosides, quadranosides VI-XI (1-6), belonging to three different ursane- (1-4), oleanane- (5) and lupane-type (6)] triterpene classes, have been isolated from a MeOH extract of the seeds of Combretum quadrangulare KURZ (Combretaceae), together with nine known compounds, rosamutin (7), 28-O-beta-D-glucopyranosyl-6beta,23-dihydroxytormentic acid (8), arjunetin (9), arjunglucoside II (10), combreglucoside (11), chebuloside II (12), vitexin (13), (+)-catechin (14) and (-)-epigallocatechin (15). The structures of these compounds were elucidated by spectroscopic analysis. |
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