Synonyms: 2-Naphthalenesulfonic acid, 3,3'-(1,2-ethenediylbis((3-sulfo-4,1-phenylene)-2,1-diazenediyl))bis(6-amino-4-hydroxy-, lithium sodium salt, compd. with 2,2'-(methylimino)bis(ethanol) (1:?:?:?);2-Naphthalenesulfonic acid, 3,3'-(1,2-ethenediylbis((3-sulfo-4,1-phenylene)azo))bis(6-amino-4-hydroxy-, lithium sodium salt, compd. with 2,2'-(methylimino)bis(ethanol);3,3'-(Vinylenebis((3-sulpho-p-phenylene)azo))bis(6-amino-4-hydroxynaphthalene-2-sulphonic) acid, lithium sodium salt , compound with2,2'-(methylimino)diethanol;lithium sodium (3Z)-6-amino-3-(2-{4-[(E)-2-{4-[(2E)-2-(7-amino-1-oxo-3-sulfonatonaphthalen-2(1H)-ylidene)hydrazinyl]-3-sulfonatophenyl}ethenyl]-3-sulfonatophenyl}hydrazinylidene)-4-oxo-3,4-dihydronaphthalene-2-sulfonate - 2,2'-(methylimino)diethanol (1:3:1:1)