3,4,8,9,10-Pentahydroxy-6-oxo-6H-dibenzo(b,d)pyran-1-carboxylic acid 476-67-5 6H-Dibenzo(b,d)pyran-1-carboxylic acid, 3,4,8,9,10-pentahydroxy-6-oxo- Luteic acid Luteolic acid