2-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis(4-hydroxy-3-((2-methyl-4-sulfophenyl)azo)-, compd. with 2,2'-iminobis(ethanol) (1:4) 7,7'-(Carbonyldiimino)bis(4-hydroxy-3-((2-methyl-4-sulphophenyl)azo)naphthalene-2-sulphonic) acid, compound with 2,2'-iminodiethanol(1:4) 7,7'-(Iminocarbonylimino)bis(4-hydroxy-3-(2-methyl-4-sulfophenylazo)-2-naphthalenesulfonic acid, diethanolamine salt (1:4) 72906-33-3 EINECS 276-997-3