disodium 5-[[4-[[[4-[[2,6-diamino-3-methyl-5-[(4-sulphonatophenyl)azo]phenyl]azo]phenyl]amino]carbonyl]phenyl]azo]salicylate

5-[[4-[[[4-[[2,6-Diamino-3-methyl-5-[(4-sulfophenyl)azo]phenyl]azo]phenyl]amino]carbonyl]phenyl]azo]-2-hydroxybenzoic acid disodium salt