Synonyms: Chromate(2-),[7-amino-4-(hydroxy-kO)-3-[[2-(hydroxy-kO)-4-nitrophenyl]azo-kN1]-2-naphthalenesulfonato(3-)][1-[[2-(hydroxy-kO)-4-nitrophenyl]azo-kN1]-2-naphthalenolato(2-)-kO]-, dihydrogen (9CI); Chromate(2-),[7-amino-4-hydroxy-3-[(2-hydroxy-4-nitrophenyl)azo]-2-naphthalenesulfonato(3-)][1-[(2-hydroxy-4-nitrophenyl)azo]-2-naphthalenolato(2-)]-,dihydrogen; 2-Naphthalenesulfonic acid,7-amino-4-hydroxy-3-[(2-hydroxy-4-nitrophenyl)azo]-, chromium complex;2-Naphthalenol, 1-[(2-hydroxy-4-nitrophenyl)azo]-, chromium complex