Synonyms: Hydrotypic Blue;2,7-Naphthalenedisulfonic acid, 5-amino-3-((4-((1,8-dihydroxy-3,6-disulfo-2-naphthalenyl)azo)phenyl)azo)-4-hydroxy-, tetrasodium salt;2,7-Naphthalenedisulfonic acid, 5-amino-4,4',5'-trihydroxy-3,3'-(p-phenylenebis(azo))di-, tetrasodium salt;AC1O6U7T;LS-94634;16589-20-1;tetrasodium (3Z)-5-amino-3-[[4-[(2E)-2-(8-hydroxy-1-oxo-3,6-disulfonatonaphthalen-2-ylidene)hydrazinyl]phenyl]hydrazinylidene]-4-oxonaphthalene-2,7-disulfonate