Benzophenone glycosides from Gnidia involucrata

Six compounds have been isolated from the methanol extract of the aerial pa rts of Gnidia involucrata (Thymelaeaceae). They were identified as 2,3,4',5 ,6-pentahydroxybenzophenone-4-C-glucoside and 2,4',6-trihydroxy-4-methoxybe nzophenone-2-O- glucoside, together with mangiferin, kaempferol-3-O-glucosi de, yuankanin and manniflavanone by chemical and spectroscopic means. The s tructures of three additional C-glycosyl flavones - vitexin, isovitexin and isoorientin - were determined on-line by LC/UV/APCI-MSn analysis of the cr ude extract. (C) 2000 Elsevier Science Ltd. All rights reserved.