Filicin is a chemical compound that has been isolated from ferns of the genus Dryopteris. It has been isolated from the male fern (Dryopteris filix-mas). Filicin has been studied for its anthelmintic activity.
A variety of chemically related compounds, sometimes referred to collectively as , have also been isolated from ferns. Chemical analysis of in fern extracts can assist in determining taxonomy. Examples of include: