Synonyms: 2-[[8-[[6-[(2-Carboxyphenyl)amino]-1,4-dihydro-4-oxo-1,3,5-triazin-2-yl]amino]-1-hydroxy-3,6-disulfo-2-naphthalenyl]azo]benzoic acid, tetraammonium salt;tetra-ammonium 2-[6-[7-(2-carboxylato-phenylazo)-8-hydroxy-3,6-disulfonato-1-naphthylamino]-4-hydroxy-1,3,5-triazin-2-ylamino]benzoate