A New Flavanone from Citrus reticulata

new flavanone, 5-hydroxy-7,2′,3′,4′,5′,6′-hexamethoxyflavanone ( 1 ), was isolated from the unripe fruit peels of Citrus reticulata (Rutaceae), together with two known polymethoxyflavones, 5,6,7,8,3′,4′ -hexamethoxyflavone ( 2 ) and 5,6,7,8,4′-pentamethoxyflavone ( 3 ). The structure of 1 was characterized and identified by spectral analysis.