SEARCH Articles Figures Tables 7,8,3 ,4 -Tetrahydroxyflavone 7,8,3 ,4 -Tetrahydroxyflavone Fisetin(3,7,3 ,4 -tetrahydroxyflavone Luteolin (5,7,3 ,4 -tetrahydroxyflavone Methyl-tetrahydroxyflavone