[摘要]：The rhizomes of Zingiber spectabile yielded a new dimeric flavonol glycoside for which the name kaempferol-3-O-(4 ''-O-acetyl)-alpha-L-rhamnopyranoside-(I-6,II-8)-kaempferol-3-O-(4 ''-O-acetyl)-alpha-L-rhamnopyran oside; spectaflavoside A (1) was proposed, along with kaempferol and its four acetylrhamnosides (2-6), demethoxycurcumin (7) and curcumin (8). The structure of spectaflavoside A was elucidated by spectroscopic methods including, 1D and 2D NMR techniques. This is the first report on the occurrence of a dimeric flavonol glycoside in the Zingiberaceae and the second in nature. Spectaflavoside A was found to be a potent iron chelating agent. (C) 2012 Elsevier Ltd. All rights reserved.
