Flavonoids, including an unusual flavonoid-Mg2+ salt, from roots of Cudrania cochinchinensis

Four flavonoids with 2′,4′-di-oxygenated B-rings were isolated from an ethanolic extract of the roots of Cudrania cochinchinensis, including an unusual flavonoid-Mg2+ salt. Their structures were elucidated by chemical and spectroscopic methods. Cytotoxic activities were evaluated against several different cell lines.