Synonyms: sodium 3-[[3-[(3-amino-4-nitrophenyl)azo]-2,4-dihydroxyphenyl]azo]-4-methoxybenzenesulphonate;3-[[3-[(3-Amino-4-nitrophenyl)azo]-2,4-dihydroxyphenyl]azo]-4-methoxy-1-benzenesulfonic acid sodium salt;2-((3-Amino-4-nitrophenyl)azo)-4-((2-methoxy-5-sulfophenyl)azo)-1,3-benzenediol, sodium salt;Benzenesulfonic acid, 3-((3-((3-amino-4-nitrophenyl)azo)-2,4-dihydroxyphenyl)azo)-4-methoxy-, monosodium salt;Benzenesulfonic acid, 3-(2-(3-(2-(3-amino-4-nitrophenyl)diazenyl)-2,4-dihydroxyphenyl)diazenyl)-4-methoxy-, sodium salt (1:1);Einecs 267-091-9