Flavonoids from the Flowers of Citrus ‘Hebesu’

2( S)-3’,4'-dimethoxy-5,7-dihydroxyflavanone 7- O-neohesperidoside (1), hesperidin (2), astragalin (3), trifolin (4), nicotiflorin (5), narirutin (6), rutin (7), kaempferol 7- O-rutinoside (8), tangeretin (9) and nobiletin (10) were isolated from the MeOH extract of flowers of Citrus ‘Hebesu’. Structures of these compounds were elucidated on the basis of physical and spectral data. Absolute configuration and complete NMR spectral data for compound 1 are reported for the first time in this paper.