(5-thio-1h-benzimidazol-2-yl)-carbamic acid ester compounds

Abstract From the Canadian patent

Novel benzimidazole derivatives useful as anthel-, mintic agents, have the structure wherein R1 is lower alkyl, phenyl-lower alkyl halo-lower, alkyl, mono lower alkylaminoalkyl di-lower alkylaminoalkyl, and alkyl pyridinium halide R2 and R3 are the same or, different and are selected from hydrogen or lower alkyl and R4 is cycloalkyl or cycloalkenyl, m is 0 to 3 n is 0, to 3 and m + n is no more than 5 and the physiologically, acceptable salts thereof where R1 includes an amino function.