disodium 5-[[4-[[[4-[(7-amino-1-hydroxy-3-sulphonato-2-naphthyl)azo]phenyl]amino]carbonyl]phenyl]azo]salicylate

5-[[4-[[[4-[(7-Amino-1-hydroxy-3-sulfo-2-naphthalenyl)azo]phenyl]amino]carbonyl]phenyl]azo]-2-hydroxybenzoic acid disodium salt