Vitexin

Vitexin is an apigenin flavone glucoside, a chemical compound found in the passion flower, Vitex agnus-castus (chaste tree or chasteberry), in the Phyllostachys nigra bamboo leaves, in the pearl millet (Pennisetum millet), and in Hawthorn.

Metabolism
Goitrogenicity of millet flavones : Vitexin inhibits thyroid peroxidase thus contributing to goiter.
 * Vitexin beta-glucosyltransferase
 * Vitexin 2"-O-rhamnoside 7-O-methyltransferase