title: Monomeric and dimeric hydrolysable tannins of Tamarix nilotica.
abstract: An ellagitannin monomer, nilotinin M1 (1), and three dimers, nilotinins D1 (2), D2 (3), and D3 (4), were isolated from leaves of Tamarix nilotica (Ehrenb.) Bunge. Structures were elucidated based on analysis of spectroscopic data and chemical correlations with known compounds. In addition, six known tannins, hirtellin A (5) (dimer), remurin A (6), remurin B (7), 1,3-di-O-galloyl-4,6-O-(S)-hexahydroxydiphenoyl-beta-D-glucose (8), gemin D (9), and hippomanin A (10) (monomers), were isolated for the first time from this plant species. The reported (13)C NMR assignments of the dehydrodigalloyl moiety and glucose cores of 5 are revised, and the (13)C NMR spectroscopic data for 6 and 7 are also reported for the first time.
authors.affiliation: Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Tsushima, Okayama 700-8530, Japan.
authors.forename: Mohamed A A
authors.initials: MA
authors.lastname: Orabi
authors.forename: Shoko
authors.initials: S
authors.lastname: Taniguchi
authors.forename: Tsutomu
authors.initials: T
authors.lastname: Hatano
mesh_terms: D002265:Carboxylic Ester Hydrolases / Q000378:metabolism; D047348:Hydrolyzable Tannins / Q000737:chemistry* / Q000378:metabolism; D009682:Magnetic Resonance Spectroscopy; D015394:Molecular Structure; D018515:Plant Leaves / Q000737:chemistry*; D032363:Tamaricaceae / Q000737:chemistry*
chemical_list: D047348:Hydrolyzable Tannins; C013515:ellagitannin; D002265:Carboxylic Ester Hydrolases; C022711:tannase