Equol, a natural estrogenic metabolite from soy isoflavones: convenient preparation and resolution of R- and S-equols and their differing binding and biological activity through estrogen receptors alpha and beta. - Muthyala,RS.; Ju,YH.; Sheng,S.; Williams,LD.; Doerge,DR.; Katzenellenbogen,BS.; Helferich,WG.; Katzenellenbogen,JA. (Bioorg Med Chem, 2004)