The title compounds were synthesized by the reaction of symmetric N,N'-diarylthioureas with hexylamine in the presence of triethyl amine,and the intermediate N,N'-diarylthioureas were formed by the direct reaction of carbon disulfide and arylamines.

Thirteen new aroyl ureas were synthesized by the reaction of 2-amino-5-(1o-chlorophenoxyethyl)-1,3,4-thiodiazole with aroyl isocyanates,and their structures were confirmend by IR,~(1)H NMR and elemental(analysis).

Thirteen N-(1,3,4-thiodiazol-2-y1)-N′-aroyl ureas were synthesize d by the reaction of aroyl iso-cyanates with 2-amino-1,3,4-thiodiazole i n yields of 54.

Synthesis,Crystal Structure and Biological Activity of N-(5-Trifluoromethyl-1,3,4-thiadiazol-2-yl)-N'-aroylureas;

Synthesis and Biological Activity of N-[5-(Pyrid-4-yl)-1,3,4-thiadiazol-2-yl]-N'-aroylureas;