Studies on the Constituents of Erythraea centaurium (LINNE) PERSOON. II. The Structure of Centauroside, a New Bis-secoiridoid Glucoside

Abstract

A new bitter principle, centauroside was obtained from the whole plant of Erythraea centaurium (LINNE) PERSOON. with two glucosides. On the basis of chemical and spectral evidence, the structure of centauroside was confirmed to be a novel bis-secoiridoidal structure (III), and the others were established to be 6'-(m-hydroxybenzoyl) loganin, and secologanin dimethyl acetal arising from secologanin during the extraction process.