Tannins and Related Polyphenols of Euphorbiaceous Plants. XI.Three New Hydrolyzable Tannins and a Polyphenol Glucoside from Euphorbia humifusa

Abstract

Three new hydrolyzable tannins, euphormisins M₁, M₂ and M₃, were isolated from Euphorbia hymifusa WILLD., and respectively characterized as 1, 3, 6-tri-O-galloyl-4-O-bravifolincarboxyl-β-D-glucose (19), an oxidative metabolite (23) of geraniin, and 1, 3, 6-tri-O-galloyl-α-D-glucose (18), by spectroscopic and chemical methods. A new ellagic acid glucoside (16) and fifteen known tannins, including geraniin (8) and four dimers [euphorbins A (13), B (14), excoecarianin (15) and eumaculin A (12)], were also isolated.