Synonyms: Benzoic acid, 3,3'-methylenebis(6-(2-(2,4-dihydroxy-5-(2-(4-sulfophenyl)diazenyl)phenyl)diazenyl)-, sodium salt (1:?);3,3'-Methylenebis(6-((2,4-dihydroxy-5-((4-sulphophenyl)azo)phenyl)azo)benzoic) acid, sodium salt;Benzoic acid, 3,3'-methylenebis(6-((2,4-dihydroxy-5-((4-sulfonylphenyl)azo)phenyl)azo)-, sodium salt;Benzoic acid, 3,3'-methylenebis(6-((2,4-dihydroxy-5-((4-sulfophenyl)azo)phenyl)azo)-, sodium salt