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Cercidiphyllum japonicum  is a deciduous tree that grows in East Asia, where its raw extracts have long been used in folk medicnes to treat various disorders or diseases. In the current work, extracts from  C. japonicum  twigs were studied for the first time. Seven individual compounds were isolated from the extracts, including a new galloylflavonol glycoside, namely 8-methoxykaempferol-4′- O -galloyl-3- O - α -L-rhamnopyranoside ( VII ), and six known phenolics [two anomeric galloyltannins (3,4,6-tri- O -galloyl- β -D-glucopyranoside ( I ) and 2,2′,5-tri- O -galloyl- α/β -D-hamamelose ( III )), one anomeric ellagictannin, pedunculagin ( II ), one flavonol, kaempferol ( V ) and two flavonol derivatives (kaempferol-3- O - α -L-rhamnopyranoside ( IV ) and 8-methoxykaempferol ( VI ))]. Structural elucidation of  I – VII  was conducted mainly on the basis of their spectroscopic [ultraviolet (UV), infrared (IR), nuclear magnetic resonance (NMR), mass spectrometry (MS)] and physicochemical analysis, as well as by comparison of the analytical data with those in the literature. Compounds  I ,  II ,  IV  and  VI  have not yet been reported in the genus  Cercidiphyllum.  Compound  VII , a previously undescribed flavonoid, was isolated and elucidated in this work for the first time.

holzforschung

Extractives of  Cercidiphyllum japonicum  twigs: isolation and structural elucidation of a new galloylflavonol glycoside, anomeric tannins and flavonoids