Table 1.

Test compounds and their hydroxylations.

Test compounds	Position of -OH
Flavone	—
5-Hydroxyflavone	5
7-Hydroxyflavone	7
Chrysin	5,7
Apigenin	5,7,4′
Kaempferol	3,5,7,4′
Fisetin	3,7,3′,4′
Quercetin	3,5,7,3′,4′