Tannins and Related Polyphenols of Euphorbiaceous Plants. V. : Euphorbin C, an Equilibrated Dimeric Dehydroellagitannin Having a New Tetrameric Galloyl Group

Abstract

Euphorbin C (5), a member of a new class of dimeric hydrolyzable tannins, has been isolated form Euphorbia hirta L. In its molecule, a monomeric hydrolyzable tannin unit having a ¹C₄ glucopyranose core which is esterified with an equilibrated dehydrohexahydroxydiphenoyl group, and another monomer unit having a ⁴C₁ glucose core are bonded through ester linkages of a euphorbinoyl group, which is a new galloyl tetramer.