Figure 1.

Structural comparison of the natural and synthetic oestrogens (a) 17β-oestradiol and (b) diethylstilbestrol with the principal classes of phyto-oestrogen: the stilbene (c) resveratrol, lignan compounds (d) enterolactone and (e)enterodiol, the coumestan (f) coumestrol, and isoflavones (g) genistein, (h) daidzein and (i) biochanin A.