The alcoholic extract of aerial parts of Ethulia conyzoides var. gracilis Asch. & Schweinf. exhibits a significant anthelmintic activity when tested in vitro against Ascaris lumbricoides using santonin as a reference. Four coumarins were isolated and identified; ethuliacoumarin A was found to be
The molluscicidal principles of Ethulia conyzoides were identified as ethuliacoumarin A (1) and isoethuliacoumarin A (2). Ethuliacoumarin A possessed an LC90 between 19 and 23.5 ppm depending on the age of the snail against Biomphalaria glabrata, and between 12 and 15 ppm against Bulinus truncatus.