Abstract In our search for effective chemotherapy of alveolar hydatid disease we are investigating key enzymes of Echinococcus multilocularis metacestodes. Isatin (2, 3- indolinedione) is well known as an inhibitor of alkaline phosphatase activity, and has been previously investigated. Acetylcarboxanilide, an 'open drug'of isatin and 2 methacrylanilides were evaluated for their ability to inhibit alkaline phosphatase activity of Echinococcus ...