Definition
Isol. from Cnicus benedictus, Forsythia viridissima, Arctium lappa, Ipomoea cairica and others (CCD) Arctigenin is a lignan found in certain plants of the Asteraceae , including the Greater burdock (Arctium lappa) and Saussurea heteromalla. It has shown antiviral and anticancer effects. It is the aglycone of arctiin. (Wikipedia)