A new acylated quercetin glycoside from the leaves of Stevia rebaudiana Bertoni

A new acylated quercetin glycoside quercetin-3-O-(4'''-O-trans-caffeoyl)--L-rhamnopyranosyl-(1 6)--D-galacopyranoside (1), along with luteolin (2), quercetin (3), luteolin-7-O--D-glucoside (4), apigenin-7-O--D-glucoside (5), quercitrin (6), quercetin-3-O--D-arabinoside (7) and 4,5-di-O-caffeoyl quinic acid (8) have been isolated from the leaves of Stevia rebaudiana Bertoni. The structures of these compounds were determined by spectroscopic methods (1H- and 13C-NMR, IR and MS) and by 2D-NMR experiments.