13091-80-0 1H-Benzotriazole, 6-chloro-4-nitro- 30773-59-2 4-Nitro-6-chlorobenzotriazole 6-Chloro-4-nitro-1H-benzotriazole 6-Chloro-4-nitrobenzotriazole EINECS 236-003-0 NSC 509702