Caffeoyl sugar esters and an ellagitannin from Rubus sanctus

Abstract

The new natural caffeoyl esters, 3,6-di-O-caffeoyl-(α/β) -glucose and 1-O-caffeoyl-β-xylose, together with the hitherto unknown natural tannin, 2,3-O-hexahydroxydiphenoyl-4,6-O-sanguisorboyl-(α/β)-glucose, have been isolated from the aqueous alcohol aerial part extract of Rubus sanctus. Establishment of all structures was based on the chemical and spectral evidence, including ESI-MS and 2D NMR. © 2003 Elsevier Ltd. All rights reserved.