1,3,4-Thiadiazole-2-sulfonamide, 5-amino- 1,3,4-Thiadiazole-5-sulfonamide, 2-amino- 14949-00-9 2-Amino-1,3,4-thiadiazole-5-sulfonamide CL 5343 NSC22979 Tio-urasin