Abstract
In order to illuminate the effective compounds in Tibetan medicine kandrakari, chemical composition of dry stems of Rubus amabilis were studied by means of various chromatographic techniques, leading to the isolation of 11 compounds. On the basis of spectroscopic data, their structures were elucidated as 1,8-dihydroxy-3,7-dimethoxyxanthone (1), 1-hydroxy-3,7,8-trimethoxyxanthone (2), 1,8-dihydroxy-3,5-dim ethoxyxanthone (3), kaempfero-3-O-(6"-trans-p-coumaroyl) -beta-D-glucopyranoside (4), quercetin (5), kaempferol (6), hyperoside (7), luteolin-7-O-beta-D-glucopy ranoside (8), apigenin-7-O-beta-D-glucopyranoside (9), isovitexin-7-O-glucoside (10), and procyanidin B4 (11). Compounds 1-3 were isolated from the Rubus genus for the first time,and compounds 1-6, 10-11 were isolated from R. amabilis for the first time.
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