Flavonoids from the Twigs of the Tibetian Medicine Myricaria germanica
Eleven flavonoids were isolated from the 60% aq. Acetone extract of the air-dried twigs of Myricaria germanica (Tamaricaceae) ,a famous Tibetian medicine. Their structures were elucidated by spectroscopic analysis and identified as3,5,4'-trihydroxy-7,3'-dimethoxyflavone (1) ,3,5,4'-trihydroxy-7-methoxyflavone (2) ,rhamnetin (3) ,3,5,7-tri-hydroxy-4'-methoxyflavone (4) .tamarixetin (5) ,kaempferol (6) ,quercetin-3-0-β-D-glucoside (7) ,kaempferol-3-0-β-D-glucuronic acid (8) , quercetin-3-0-β-D-glucuronicacid (9) , quercetrin (10), and afzelin (11), respectively. All compounds were obtained from M. Germanica tot the first time,and compounds 4,5,7 -11 were obtained from the genus Myricaria for the first time.