Contribution à la phytochimie du genre Gentiana,XVIII. Structure du gentiabavarutinoside,un nouveau glycoside xanthonique acylé isolé de Gentiana bavaricaL

Phytochemistry of genus Gentiana, XVIII: Structure of gentiabavarutinoside, a new acylated xanthone glycoside from Gentiana bavarica L. In a previous work 1], we isolated from Gentiana bavarica L . an acylated xanthone glycoside (1,8-dihydroxy-3-methoxy-xanthone-7-O-acetylrutinoside 1 or gentiabavarutinoside) without locating the acetyl group. By ¹³C-NMR. spectroscopy, the attach position of the acetyl is now shown to be at 4 of the rhamnose moiety. In addition, a new compound ( 2 ), the desacetyl derivative of 1 , has also been isolated and identified.