Synonyms: 1-[2-[p-[(2-Chloro-4-nitrophenyl)azo]-N-ethylanilino]ethyl]-1,1-dimethylhydrazoniumchloride (7CI); Hydrazinium,1-[2-[[4-[(2-chloro-4-nitrophenyl)azo]phenyl]ethylamino]ethyl]-1,1-dimethyl-,chloride (9CI); Hydrazinium,1-[2-[p-[(2-chloro-4-nitrophenyl)azo]-N-ethylanilino]ethyl]-1,1-dimethyl-,chloride (8CI)