Notes: Formononetin is an isoflavonoid phytoestrogenic compound found in soy-based foods and is the precursor of daidzein (Item No. 10005166).{22968} It acts as an agonist of the aryl hydrocarbon receptor with an EC50 value of 0.13 µM.{27054} Formononetin has been reported to possess antitumor and antiviral activity.{28727,28726}