Synonyms: 1,3-Naphthalenedisulfonic acid, 7,7'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)-2,1-diazenediyl))bis-, lithium sodium salt (1:?:?);7,7'-(Carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis(1,3-naphthalenedisulfonic acid), sodium, lithium salt;1,3-Naphthalenedisulfonic acid, 7,7'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis-, lithium sodium salt;7,7'-(Carbonylbis(imino(5-methoxy-2-methyl-p-phenylene)azo))bis(naphthalene-1,3-disulphonic) acid, lithium sodium salt;lithium sodium 7-[(E)-{4-[({4-[(E)-(6,8-disulfonatonaphthalen-2-yl)diazenyl]-2-methoxy-5-methylphenyl}carbamoyl)amino]-5-methoxy-2-methylphenyl}diazenyl]naphthalene-1,3-disulfonate (2:2:1)