Abstract
Two new monomeric hydrolyzable tannins [remurins A (12) and B (13)] and a new dimer [hirtellin A (7)], have been isolated from Reaumuria hirtella JAUB. et Sp. (Tamaricaceae). Hirtellin A and an additional new dimeric hydrolyzable tannin, tamarixinin A (6), along with three known tannins including hirtellin B (5), have also been isolated from Tamarix pakistanica QAISER.The structures of the new tannins have been elucidated based on chemical method and two-dimensional nuclear magnetic resonance analyses indluding 1H-13C long-range shift correlation spectroscopy. Tamarixinin A (6) exhibited a host-mediated antitumor activity comparable to that of hertellin B.
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