1,3,4-Thiadiazolidine-2,5-dithione, dipotassium salt 1072-71-5 2,5-Dimercapto-1,3,4-thiadiazole, dipotassium salt 4628-94-8 Dipotassium 1,3,4-thiadiazole-2,5-dithiolate EINECS 225-043-4