1,3,4-Thiadiazol-2-amine, 5-(1-methyl-5-nitro-1H-imidazol-2-yl)- 1,3,4-Thiadiazole, 2-amino-5-(1-methyl-5-nitroimidazol-2-yl)- 19622-55-0 CL 64855 NSC265726 Nitroimidazole thiadiazole