Ethyl 5-chloro-1,3,4-thiadiazole-2-carboxylate
Ethyl 1,2,4-thiadiazole-5-carboxylate
Ethyl 1,3,4-thiadiazole-2-carboxylate
Ethyl 2-((5-thioxo-4,5-dihydro-1,3,4-thiadiazol-2-yl)thio)acetate
