The novel natural polyphenol, 2-O-galloyl-3-O-(3,4,5,6,7-pentahydroxyb
iphenyl ether-8(a)-carboxylic acid-1-carboxyloyl)-4,6 ydroxybiphenoyl-
(alpha/beta)-C-4(1)-glucopyranose, tamarixellagic acid, together wi th
the known dehydrodigallic and dehydrotrigallic acids were isolated fr
om the galls of Tamarix aphylla. The structures were established by co
nventional methods of analysis and confirmed by spectral procedures.