title: Revised structures of four saponins from Nauclea diderrichii.
abstract: The interglycosidic linkages of four quinovic acid glycosides previously described from the bark of Nauclea diderrichii (de Wild) Merr. (Rubiaceae) are revised on the basis of 2D-NMR spectroscopic results. The structures were established as: quinovic acid 3-O-beta-glucopyranosyl(1-->4)-beta-fucopyranosyl-(28-->1)-beta -glucopyranosyl ester, quinovic acid 3-O-beta-glucopyranosyl-(1-->4)-alpha-rhamnopyranosyl-(28-->1)-beta-glucopyranosyl ester, quinovic acid 3-O-beta-glucopyrnaosyl-(1-->4)-beta-fucopyranoside, and quinovic acid 3-O-beta-glucopyranosyl-(1-->4)-alpha-rhamnopyranoside. The first three saponins are new compounds.
authors.forename: M
authors.initials: M
authors.lastname: Lamidi
authors.forename: E
authors.initials: E
authors.lastname: Ollivier
authors.forename: R
authors.initials: R
authors.lastname: Faure
authors.forename: L
authors.initials: L
authors.lastname: Debrauwer
authors.forename: L
authors.initials: L
authors.lastname: Nze-Ekekang
authors.forename: G
authors.initials: G
authors.lastname: Balansard