5905-21-5 7-(4-(Benzoylamino)phenylamino)-3-((4-((3-carboxy-4-hydroxyphenyl)azo)-2-carboxymethoxy-6-sulfonaphth-1-yl)azo)-4-hydroxy-2-naphthalenesulfonic acid, tetrasodium salt Benzoic acid, 5-((4-((6-((4-(benzoylamino)phenyl)amino)-1-hydroxy-3-sulfo-2-naphthalenyl)azo)-3-(carboxymethoxy)-7-sulfo-1-naphthalenyl)azo)-2-hydroxy-, tetrasodium salt