Tannins of Tamaricaceous Plants. V. New Dimeric, Trimeric and Tetrameric Ellagitannins from Reaumuria hirtella

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A new hydrolyzable tannin dimer [hirtellin G (1)], a trimer [hirtellin T₁ (5)] and a tetramer [hirtellin Q₁ (6)] have been isolated from the 70% acetone extract of the leaves of Reaumuria hirtella JAUB. et SP. (Tamaricaceae). These tannins were characterized as oligomers composed of two, three or four molecules of tellimagrandin II which are similarly linked with each other through one, two or three dehydrodigalloyl (m-GOG) units. Their structures including the orientations of the m-GOG units have been elucidated based on chemical degradation and spectroscopic analyses.