3,4-Dichloro-1,2,5-thiadiazole5728-20-1100 % similar 3-Chloro-4-morpholino-1,2,5-thiadiazole30165-96-941 % similar 2,3-Dichloropyrazine4858-85-933 % similar Pentachloropyridine2176-62-732 % similar 2,1,3-Benzothiadiazole273-13-230 % similar