Synonyms: 2,7-Naphthalenedisulfonic acid, 4-((4'-((2,4-diamino-5-sulfophenyl)azo)-3,3'-dimethoxy(1,1'-biphenyl)-4-yl)azo)-3-hydroxy-, sodium salt, compd. with 2,2',2''-(nitrilotris(2,1-ethanediyloxy))tris(ethanol);sodium; 2-[2-[bis[2-(2-hydroxyethoxy)ethyl]amino]ethoxy]ethanol; 4-[4-[4-(2,4-diamino-5-sulfo-phenyl)azo-3-methoxy-phenyl]-2-methoxy-phenyl]azo-3-hydroxy-7-sulfo-naphthalene-2-sulfonate