2-Nitro-9H-carbazole , its CAS NO. is 14191-22-1, the synonyms are 2-Nitrocarbazole ; 4-20-00-03865 (Beilstein Handbook Reference) ; BRN 0185689 ; CCRIS 6500 ; NSC 249828 ; 9H-Carbazole, 2-nitro- ; Carbazole, 2-nitro- .