2-Naphthalenesulfonic acid, 7,7'-(carbonyldiimino)bis(4-hydroxy-3-((4-sulfo-2-methylphenyl)azo)-, compd. with 2,2'-(methylimino)bis(ethanol) (1:4) 7,7'-(Carbonyldiimino)bis(4-hydroxy-3-((2-methyl-4-sulfophenyl)azo)-2-naphthalenesulfonic acid), tetra(methyldiethanolamine) salt 73003-71-1