5-Bromo-4-nitro-1H-benzimidazole (CAS No.281190-51-0), its synonyms are 1H-Benzimidazole, 5-bromo-4-nitro- 1H-Benzimidazole, 6-bromo-7-nitro- ; 6-Bromo-7-nitro-1H-benzo[d]imidazole .