2-(3,4-Dihydroxyphenyl)-5,7-dihydroxy-4-benzopyrone 3',4',5,7-Tetrahydroxyflavone 491-70-3 4H-1-Benzopyran-4-one, 2-(3,4-dihydroxyphenyl)-5,7-dihydroxy- (9CI) 5-18-05-00296 (Beilstein Handbook Reference) BRN 0292084 C.I. 75590 C.I. Natural Yellow 2 CCRIS 3790 Cyanidenon 1470 Digitoflavone EINECS 207-741-0 FLAVONE, 3',4',5,7-TETRAHYDROXY- Flacitran Luteolin Luteoline Luteolol Weld Lake Yama kariyasu