Phaseolus mungo, Vigna mungo, Isoflavonoids, Phytoalexins Sixteen isoflavonoids have been isolated from the black gram, Phaseolus mungo L. (syn. Vigna mungo) following treatment with aqueous CuCl2. These include 12 known isoflavonoids: genistein, 2'-hydroxygenistein, 2'-hydroxydaidzein, kievitone, dalbergioidin, cyclokievitone, 5-deoxykievitone, 2'-hydroxydihydrodaidzein, isoferreirin, aureol, ...