Anthelmintically active 2-carbalkoxyamino benzimidazolyl-5(6) sulfonic acid phenyl esters and process for their manufacture

Abstract From the Canadian patent

New carbalkoxyamino-benzimidazolyl-5(6)-sulfonic acid phenyl ester of the formula I, (1), wherein R1 represents alkyl having 1 to 4 carbon atoms R2, and R3, independently of each other each represents hydrogen, hydroxy, alkoxy having 1 to 4 carbon atoms halogen, tri-, fluoromethyl, alkyl having 1 to 4 carbon atoms carbalkoxy having, 1 to 4 carbon atoms in the alkoxy moiety or cyano are disclosed, as well as a process for their manufacture. The new compounds have valuable chemotherapeutic properties and are suitable for combating diseases caused by parasites in humans and animals, such as helminths and liver flukes.