Synonyms: 2-Naphthalenesulfonic acid, 5(or 8)-(2-(3-(2-(4-(2-(3-chloro-2-methyl-5-sulfophenyl)diazenyl)-3-methylphenyl)diazenyl)-2,6-dihydroxyphenyl)diazenyl)-, sodium salt (1:2);2-Naphthalenesulfonic acid, 5(or 8)-((3-((4-((3-chloro-2-methyl-5-sulfophenyl)azo)-3-methylphenyl)azo)-2,6-dihydroxyphenyl)azo)-, disodium salt;Disodium (5or8)-((3-((4-((3-chloro-2-methyl-5-sulphonatophenyl)azo)-3-methylphenyl)azo)-2,6-dihydroxyphenyl)azo)naphthalene-2-sulphonate;disodium 5-{(2Z)-2-[(5E)-5-(2-{4-[(E)-(3-chloro-2-methyl-5-sulfonatophenyl)diazenyl]-3-methylphenyl}hydrazinylidene)-2,6-dioxocyclohex-3-en-1-ylidene]hydrazinyl}naphthalene-2-sulfonate