... Formula: C15H10O5 Molecular Weight: 270.2 Purity: 98% Genistein is an isoflavonoid phytoestrogenic compound found in soybeans, pea ... tumors in a fashion similar to diethylstilbestrol (DES). Genistein is a tyrosine-specific inhibitor of protein kinase activity, ... tyrosine-phosphorylation of histone H2B. In adult animals, dietary genistein has chemopreventive effects on breast, prostate, and other ...