Serrulosid und Serrulatosid, zwei neue Iridoidglykoside aus Penstemon serrulatus ¹

Abstract

From leaves of Penstemon serrulatus Menz. two new iridoid glycosides have been isolated. Both glycosides have the same aglycon part, but differ in their carbohydrate moieties. The structure of serru-loside (penstemidaglucon-11-O-β-D-ribohexos -3-uloside) and serrulatoside (penstemidaglucon-ll-O-β-4′-desoxyaltropyranosido-6′-O-β-D-glucopyranoside) was established by spectroscopic methods (mainly ¹H- and ¹³C-NMR) and comparison with known compounds.