The cytotoxic action in vitro of catalytically sulphurated unsaturated fatty acids on Ehrlich's ascites cancer and normal peritoneal exudate (leucocytes).

Diethanolamine salts of the catalytically sulphurated oleic acid (X-303/1) and of the catalytically sulphurated fatty acids isolated from linseed oil (X-303/2) were found to exhibit a strong cytotoxic in vitro activity against Ehrlich ascites cancer cells with minimal cytotoxic effect on normal cells (leukocytes) of the peritoneal exudate in rabbits.