disodium 5-[[4-[[2,6-dihydroxy-3-[[2-hydroxy-5-[(3-sulphonatophenyl)azo]phenyl]azo]phenyl]azo]benzoyl]amino]salicylate

5-[[4-[[2,6-Dihydroxy-3-[[2-hydroxy-5-[[3-(sodiosulfo)phenyl]azo]phenyl]azo]phenyl]azo]benzoyl]amino]benzoic acid sodium salt