Five naphthalene glycosides from the roots of Rumex patientia

Three novel and two known naphthalene glycosides were isolated from the roo ts of Rumex patientia L. (Polygonaceae). The structures of the new compound s were established, respectively as 2-acetyl-3-methyl-6-carboxy-1,8-dihydro xynaphthalene-8-O-beta -D-glucopyranosyl 4,4 " -binaphthalene-8,8 " -O,O-di -beta -D-glucopyranoside and 2-acetyl-3-methyl-1,8-dihydroxynaphthalene-8-O -beta -D- glucopyranosyl (1-->3) beta -D-glucopyranoside on the basis of sp ectral analysis. The other napthalene glycosides were determined as nepodin -8-O-beta -D-glucopyranoside and torachrysone-8-O-beta -D-glucopyranoside b y comparison of their spectral data with those previously reported. (C) 200 1 Elsevier Science Ltd. All rights reserved.