A. Isoflavone ring system showing the ring nomenclature and numbering
R1
R2
R3
Genistein
-H
-OH
-OH
Daidzein
-H
-H
-OH
Glycitein
-OCH3
-H
-OH
Formononetin
-H
-H
-OCH3
Biochanin A
-H
-OH
-OCH3
B. Structures of Isoflavones discussed in this article
Table 1:
Position of Ring A in the isoflavone ring.
