Arctigenin

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 in vitro. It is the aglycone of arctiin. The use of arctigenin has been shown to be effective in a mouse model of Japanese encephalitis. ...
Found on http://en.wikipedia.org/wiki/Arctigenin

arctigenin

A substance found in certain plants, including burdock. It has shown antiviral and anticancer effects. Arctigenin belongs to a group of substances called lignans.
Found on http://www.cancer.gov/dictionary?expand=A
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