Synonyms: 1,5-Naphthalenedisulfonic acid, 3,3'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)-2,1-diazenediyl))bis-, compd. with 2,2'-iminobis(ethanol) (1:?);1,5-Naphthalenedisulfonic acid, 3,3'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis-, diethanolamine salt;1,5-Naphthalenedisulfonic acid, 3,3'-(carbonylbis(imino(5-methoxy-2-methyl-4,1-phenylene)azo))bis-, compd. with 2,2'-iminobis(ethanol);3,3'-(Carbonylbis(imino(5-methoxy-2-methyl-p-phenylene)azo))bis(naphthalene-1,5-disulphonic) acid, compound with 2,2'-iminodiethanol;3-[(E)-{4-[({4-[(E)-(4,8-disulfonaphthalen-2-yl)diazenyl]-2-methoxy-5-methylphenyl}carbamoyl)amino]-5-methoxy-2-methylphenyl}diazenyl]naphthalene-1,5-disulfonic acid - 2,2'-iminodiethanol (1:1)