Abstract By means of partition and preparative TLC, two pro-inflammatory diterpeneesters were isolated fromEuphorbia peplus . These compounds were identified as 20-deoxyingenol 3- O -angelate which exhibited an ID 50 of O.18 μg on mice and the new ester ingenol 20- O -octanoate which exhibited an ID 50 of 1.0 μg also on mice skin.